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Introducing Copyright include file
[u/mrichter/AliRoot.git] / TPC / AliTPC.cxx
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fe4da5cc 1///////////////////////////////////////////////////////////////////////////////
2// //
3// Time Projection Chamber //
4// This class contains the basic functions for the Time Projection Chamber //
5// detector. Functions specific to one particular geometry are //
6// contained in the derived classes //
7// //
8//Begin_Html
9/*
1439f98e 10<img src="picts/AliTPCClass.gif">
fe4da5cc 11*/
12//End_Html
13// //
8c555625 14// //
fe4da5cc 15///////////////////////////////////////////////////////////////////////////////
16
17#include <TMath.h>
18#include <TRandom.h>
19#include <TVector.h>
8c555625 20#include <TMatrix.h>
fe4da5cc 21#include <TGeometry.h>
22#include <TNode.h>
23#include <TTUBS.h>
24#include <TObjectTable.h>
1578254f 25#include "TParticle.h"
fe4da5cc 26#include "AliTPC.h"
27#include "AliRun.h"
28#include <iostream.h>
29#include <fstream.h>
30#include "AliMC.h"
31
8c555625 32//MI change
33#include "AliTPCParam.h"
34#include "AliTPCD.h"
35#include "AliTPCPRF2D.h"
36#include "AliTPCRF1D.h"
37
38
1283eee5 39
fe4da5cc 40ClassImp(AliTPC)
41
42//_____________________________________________________________________________
43AliTPC::AliTPC()
44{
45 //
46 // Default constructor
47 //
48 fIshunt = 0;
49 fClusters = 0;
50 fHits = 0;
51 fDigits = 0;
52 fTracks = 0;
53 fNsectors = 0;
54 fNtracks = 0;
55 fNclusters= 0;
3c0f9266 56
8c555625 57 fDigParam= new AliTPCD();
58 fDigits = fDigParam->GetArray();
fe4da5cc 59}
60
61//_____________________________________________________________________________
62AliTPC::AliTPC(const char *name, const char *title)
63 : AliDetector(name,title)
64{
65 //
66 // Standard constructor
67 //
68
69 //
70 // Initialise arrays of hits and digits
71 fHits = new TClonesArray("AliTPChit", 176);
8c555625 72 // fDigits = new TClonesArray("AliTPCdigit",10000);
73 //MI change
74 fDigParam= new AliTPCD;
75 fDigits = fDigParam->GetArray();
3c0f9266 76
77 AliTPCParam *fTPCParam = &(fDigParam->GetParam());
78
fe4da5cc 79 //
80 // Initialise counters
3c0f9266 81 //
fe4da5cc 82 fClusters = 0;
83 fTracks = 0;
3c0f9266 84 fNsectors = fTPCParam->GetNSector();
fe4da5cc 85 fNtracks = 0;
86 fNclusters= 0;
87 fDigitsIndex = new Int_t[fNsectors+1];
88 fClustersIndex = new Int_t[fNsectors+1];
89 //
90 fIshunt = 0;
91 //
92 // Initialise color attributes
93 SetMarkerColor(kYellow);
94}
95
96//_____________________________________________________________________________
97AliTPC::~AliTPC()
98{
99 //
100 // TPC destructor
101 //
102 fIshunt = 0;
103 delete fHits;
104 delete fDigits;
105 delete fClusters;
106 delete fTracks;
8c555625 107 delete fDigParam;
fe4da5cc 108 if (fDigitsIndex) delete [] fDigitsIndex;
109 if (fClustersIndex) delete [] fClustersIndex;
110}
111
112//_____________________________________________________________________________
113void AliTPC::AddCluster(Float_t *hits, Int_t *tracks)
114{
115 //
116 // Add a simulated cluster to the list
117 //
118 if(!fClusters) fClusters=new TClonesArray("AliTPCcluster",10000);
119 TClonesArray &lclusters = *fClusters;
120 new(lclusters[fNclusters++]) AliTPCcluster(hits,tracks);
121}
122
123//_____________________________________________________________________________
124void AliTPC::AddCluster(const AliTPCcluster &c)
125{
126 //
127 // Add a simulated cluster copy to the list
128 //
129 if(!fClusters) fClusters=new TClonesArray("AliTPCcluster",10000);
130 TClonesArray &lclusters = *fClusters;
131 new(lclusters[fNclusters++]) AliTPCcluster(c);
132}
133
134//_____________________________________________________________________________
135void AliTPC::AddDigit(Int_t *tracks, Int_t *digits)
136{
137 //
138 // Add a TPC digit to the list
139 //
8c555625 140 // TClonesArray &ldigits = *fDigits;
141 //MI change
142 TClonesArray &ldigits = *fDigParam->GetArray();
fe4da5cc 143 new(ldigits[fNdigits++]) AliTPCdigit(tracks,digits);
144}
145
146//_____________________________________________________________________________
147void AliTPC::AddHit(Int_t track, Int_t *vol, Float_t *hits)
148{
149 //
150 // Add a hit to the list
151 //
152 TClonesArray &lhits = *fHits;
153 new(lhits[fNhits++]) AliTPChit(fIshunt,track,vol,hits);
154}
155
156//_____________________________________________________________________________
157void AliTPC::AddTrack(Float_t *hits)
158{
159 //
160 // Add a track to the list of tracks
161 //
162 TClonesArray &ltracks = *fTracks;
163 new(ltracks[fNtracks++]) AliTPCtrack(hits);
164}
165
166//_____________________________________________________________________________
167void AliTPC::AddTrack(const AliTPCtrack& t)
168{
169 //
170 // Add a track copy to the list of tracks
171 //
172 if(!fTracks) fTracks=new TClonesArray("AliTPCtrack",10000);
173 TClonesArray &ltracks = *fTracks;
174 new(ltracks[fNtracks++]) AliTPCtrack(t);
175}
176
177//_____________________________________________________________________________
178void AliTPC::BuildGeometry()
179{
180 //
181 // Build TPC ROOT TNode geometry for the event display
182 //
183 TNode *Node, *Top;
184 TTUBS *tubs;
185 Int_t i;
186 const int kColorTPC=19;
1283eee5 187 char name[5], title[25];
fe4da5cc 188 const Double_t kDegrad=TMath::Pi()/180;
1283eee5 189 const Double_t kRaddeg=180./TMath::Pi();
190
191 AliTPCParam * fTPCParam = &(fDigParam->GetParam());
192
193 Float_t InnerOpenAngle = fTPCParam->GetInnerAngle();
194 Float_t OuterOpenAngle = fTPCParam->GetOuterAngle();
195
196 Float_t InnerAngleShift = fTPCParam->GetInnerAngleShift();
197 Float_t OuterAngleShift = fTPCParam->GetOuterAngleShift();
198
199 Int_t nLo = fTPCParam->GetNInnerSector()/2;
200 Int_t nHi = fTPCParam->GetNOuterSector()/2;
201
202 const Double_t loAng = (Double_t)TMath::Nint(InnerOpenAngle*kRaddeg);
203 const Double_t hiAng = (Double_t)TMath::Nint(OuterOpenAngle*kRaddeg);
204 const Double_t loAngSh = (Double_t)TMath::Nint(InnerAngleShift*kRaddeg);
205 const Double_t hiAngSh = (Double_t)TMath::Nint(OuterAngleShift*kRaddeg);
206
207
fe4da5cc 208 const Double_t loCorr = 1/TMath::Cos(0.5*loAng*kDegrad);
209 const Double_t hiCorr = 1/TMath::Cos(0.5*hiAng*kDegrad);
1283eee5 210
211 Double_t rl,ru;
212
213
fe4da5cc 214 //
215 // Get ALICE top node
fe4da5cc 216 //
1283eee5 217
218 Top=gAlice->GetGeometry()->GetNode("alice");
219
220 // inner sectors
221
222 rl = fTPCParam->GetInSecLowEdge();
223 ru = fTPCParam->GetInSecUpEdge();
224
225
fe4da5cc 226 for(i=0;i<nLo;i++) {
227 sprintf(name,"LS%2.2d",i);
1283eee5 228 name[4]='\0';
229 sprintf(title,"TPC low sector %3d",i);
230 title[24]='\0';
231
232 tubs = new TTUBS(name,title,"void",rl*loCorr,ru*loCorr,250.,
233 loAng*(i-0.5)+loAngSh,loAng*(i+0.5)+loAngSh);
fe4da5cc 234 tubs->SetNumberOfDivisions(1);
235 Top->cd();
236 Node = new TNode(name,title,name,0,0,0,"");
237 Node->SetLineColor(kColorTPC);
238 fNodes->Add(Node);
239 }
1283eee5 240
fe4da5cc 241 // Outer sectors
1283eee5 242
243 rl = fTPCParam->GetOuSecLowEdge();
244 ru = fTPCParam->GetOuSecUpEdge();
245
fe4da5cc 246 for(i=0;i<nHi;i++) {
247 sprintf(name,"US%2.2d",i);
1283eee5 248 name[4]='\0';
fe4da5cc 249 sprintf(title,"TPC upper sector %d",i);
1283eee5 250 title[24]='\0';
251 tubs = new TTUBS(name,title,"void",rl*hiCorr,ru*hiCorr,250,
252 hiAng*(i-0.5)+hiAngSh,hiAng*(i+0.5)+hiAngSh);
fe4da5cc 253 tubs->SetNumberOfDivisions(1);
254 Top->cd();
255 Node = new TNode(name,title,name,0,0,0,"");
256 Node->SetLineColor(kColorTPC);
257 fNodes->Add(Node);
258 }
1283eee5 259}
260
261
262
fe4da5cc 263//_____________________________________________________________________________
264Int_t AliTPC::DistancetoPrimitive(Int_t , Int_t )
265{
266 //
267 // Calculate distance from TPC to mouse on the display
268 // Dummy procedure
269 //
270 return 9999;
271}
272
fe4da5cc 273//_____________________________________________________________________________
274static Double_t SigmaY2(Double_t r, Double_t tgl, Double_t pt)
275{
276 //
3c0f9266 277 // Parametrised error of the cluster reconstruction (pad direction)
fe4da5cc 278 //
279 pt=TMath::Abs(pt)*1000.;
280 Double_t x=r/pt;
281 tgl=TMath::Abs(tgl);
282 Double_t s=a_rphi - b_rphi*r*tgl + c_rphi*x*x + d_rphi*x;
283 if (s<0.4e-3) s=0.4e-3;
3c0f9266 284 s*=1.3; //Iouri Belikov
fe4da5cc 285 return s;
286}
287
288//_____________________________________________________________________________
289static Double_t SigmaZ2(Double_t r, Double_t tgl)
290{
291 //
3c0f9266 292 // Parametrised error of the cluster reconstruction (drift direction)
fe4da5cc 293 //
294 tgl=TMath::Abs(tgl);
295 Double_t s=a_z - b_z*r*tgl + c_z*tgl*tgl;
296 if (s<0.4e-3) s=0.4e-3;
3c0f9266 297 s*=1.3; //Iouri Belikov
fe4da5cc 298 return s;
299}
300
301//_____________________________________________________________________________
3c0f9266 302inline Double_t f1(Double_t x1,Double_t y1,
fe4da5cc 303 Double_t x2,Double_t y2,
304 Double_t x3,Double_t y3)
305{
3c0f9266 306 //-----------------------------------------------------------------
307 // Initial approximation of the track curvature
fe4da5cc 308 //
3c0f9266 309 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
310 //-----------------------------------------------------------------
fe4da5cc 311 Double_t d=(x2-x1)*(y3-y2)-(x3-x2)*(y2-y1);
312 Double_t a=0.5*((y3-y2)*(y2*y2-y1*y1+x2*x2-x1*x1)-
313 (y2-y1)*(y3*y3-y2*y2+x3*x3-x2*x2));
314 Double_t b=0.5*((x2-x1)*(y3*y3-y2*y2+x3*x3-x2*x2)-
315 (x3-x2)*(y2*y2-y1*y1+x2*x2-x1*x1));
8c555625 316
fe4da5cc 317 Double_t xr=TMath::Abs(d/(d*x1-a)), yr=d/(d*y1-b);
8c555625 318
fe4da5cc 319 return -xr*yr/sqrt(xr*xr+yr*yr);
320}
321
322
323//_____________________________________________________________________________
3c0f9266 324inline Double_t f2(Double_t x1,Double_t y1,
fe4da5cc 325 Double_t x2,Double_t y2,
326 Double_t x3,Double_t y3)
327{
3c0f9266 328 //-----------------------------------------------------------------
329 // Initial approximation of the track curvature times center of curvature
fe4da5cc 330 //
3c0f9266 331 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
332 //-----------------------------------------------------------------
fe4da5cc 333 Double_t d=(x2-x1)*(y3-y2)-(x3-x2)*(y2-y1);
334 Double_t a=0.5*((y3-y2)*(y2*y2-y1*y1+x2*x2-x1*x1)-
335 (y2-y1)*(y3*y3-y2*y2+x3*x3-x2*x2));
336 Double_t b=0.5*((x2-x1)*(y3*y3-y2*y2+x3*x3-x2*x2)-
337 (x3-x2)*(y2*y2-y1*y1+x2*x2-x1*x1));
8c555625 338
fe4da5cc 339 Double_t xr=TMath::Abs(d/(d*x1-a)), yr=d/(d*y1-b);
340
341 return -a/(d*y1-b)*xr/sqrt(xr*xr+yr*yr);
342}
343
344//_____________________________________________________________________________
3c0f9266 345inline Double_t f3(Double_t x1,Double_t y1,
fe4da5cc 346 Double_t x2,Double_t y2,
347 Double_t z1,Double_t z2)
348{
3c0f9266 349 //-----------------------------------------------------------------
350 // Initial approximation of the tangent of the track dip angle
fe4da5cc 351 //
3c0f9266 352 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
353 //-----------------------------------------------------------------
fe4da5cc 354 return (z1 - z2)/sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
355}
356
357//_____________________________________________________________________________
3c0f9266 358static int FindProlongation(AliTPCtrack& t, const AliTPCSector *sec,
359 int s, int rf=0)
fe4da5cc 360{
3c0f9266 361 //-----------------------------------------------------------------
362 // This function tries to find a track prolongation.
fe4da5cc 363 //
3c0f9266 364 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
365 //-----------------------------------------------------------------
366 const int ROWS_TO_SKIP=int(0.5*sec->GetNRows());
367 const Float_t MAX_CHI2=12.;
fe4da5cc 368 int try_again=ROWS_TO_SKIP;
369 Double_t alpha=sec->GetAlpha();
3c0f9266 370 int ns=int(2*TMath::Pi()/alpha+0.5);
8c555625 371
3c0f9266 372 for (int nr=sec->GetRowNumber(t.GetX())-1; nr>=rf; nr--) {
373 Double_t x=sec->GetX(nr), ymax=sec->GetMaxY(nr);
374 if (!t.PropagateTo(x)) return 0;
8c555625 375
3c0f9266 376 AliTPCcluster *cl=0;
fe4da5cc 377 Double_t max_chi2=MAX_CHI2;
378 const AliTPCRow& row=sec[s][nr];
379 Double_t sy2=SigmaY2(t.GetX(),t.GetTgl(),t.GetPt());
380 Double_t sz2=SigmaZ2(t.GetX(),t.GetTgl());
3c0f9266 381 Double_t road=5.*sqrt(t.GetSigmaY2() + sy2), y=t.GetY(), z=t.GetZ();
8c555625 382
fe4da5cc 383 if (road>30) {
3c0f9266 384 if (t>4) cerr<<t<<" FindProlongation warning: Too broad road !\n";
385 return 0;
fe4da5cc 386 }
8c555625 387
388 if (row) {
fe4da5cc 389 for (int i=row.Find(y-road); i<row; i++) {
390 AliTPCcluster* c=(AliTPCcluster*)(row[i]);
391 if (c->fY > y+road) break;
392 if (c->IsUsed()) continue;
3c0f9266 393 if ((c->fZ - z)*(c->fZ - z) > 25.*(t.GetSigmaZ2() + sz2)) continue;
fe4da5cc 394 Double_t chi2=t.GetPredictedChi2(c);
395 if (chi2 > max_chi2) continue;
396 max_chi2=chi2;
397 cl=c;
398 }
8c555625 399 }
fe4da5cc 400 if (cl) {
401 t.Update(cl,max_chi2);
3c0f9266 402 Double_t ll=TMath::Sqrt((1+t.GetTgl()*t.GetTgl())/
403 (1-(t.GetC()*x-t.GetEta())*(t.GetC()*x-t.GetEta())));
404 cl->fdEdX = cl->fQ/ll;
fe4da5cc 405 try_again=ROWS_TO_SKIP;
406 } else {
8c555625 407 if (try_again==0) break;
408 if (y > ymax) {
409 s = (s+1) % ns;
3c0f9266 410 if (!t.Rotate(alpha)) return 0;
8c555625 411 } else if (y <-ymax) {
3c0f9266 412 s = (s-1+ns) % ns;
413 if (!t.Rotate(-alpha)) return 0;
fe4da5cc 414 }
8c555625 415 try_again--;
fe4da5cc 416 }
417 }
8c555625 418
3c0f9266 419 return 1;
fe4da5cc 420}
421
8c555625 422
fe4da5cc 423//_____________________________________________________________________________
3c0f9266 424static void MakeSeeds(TObjArray& seeds,const AliTPCSector *sec, int max_sec,
425int i1, int i2)
fe4da5cc 426{
3c0f9266 427 //-----------------------------------------------------------------
428 // This function creates track seeds.
fe4da5cc 429 //
3c0f9266 430 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
431 //-----------------------------------------------------------------
fe4da5cc 432 TMatrix C(5,5); TVector x(5);
3c0f9266 433 double alpha=sec->GetAlpha(), shift=sec->GetAlphaShift();
434 double cs=cos(alpha), sn=sin(alpha);
fe4da5cc 435 for (int ns=0; ns<max_sec; ns++) {
436 int nl=sec[(ns-1+max_sec)%max_sec][i2];
437 int nm=sec[ns][i2];
438 int nu=sec[(ns+1)%max_sec][i2];
fe4da5cc 439 const AliTPCRow& r1=sec[ns][i1];
440 for (int is=0; is < r1; is++) {
3c0f9266 441 double x1=sec->GetX(i1), y1=r1[is]->fY, z1=r1[is]->fZ;
fe4da5cc 442 for (int js=0; js < nl+nm+nu; js++) {
443 const AliTPCcluster *cl;
8c555625 444 int ks;
3c0f9266 445 double x2=sec->GetX(i2), y2, z2, tmp;
446
fe4da5cc 447 if (js<nl) {
8c555625 448 ks=(ns-1+max_sec)%max_sec;
fe4da5cc 449 const AliTPCRow& r2=sec[(ns-1+max_sec)%max_sec][i2];
450 cl=r2[js];
3c0f9266 451 y2=cl->fY; z2=cl->fZ;
452 tmp= x2*cs+y2*sn;
453 y2 =-x2*sn+y2*cs; x2=tmp;
fe4da5cc 454 } else
455 if (js<nl+nm) {
8c555625 456 ks=ns;
fe4da5cc 457 const AliTPCRow& r2=sec[ns][i2];
458 cl=r2[js-nl];
3c0f9266 459 y2=cl->fY; z2=cl->fZ;
fe4da5cc 460 } else {
8c555625 461 ks=(ns+1)%max_sec;
fe4da5cc 462 const AliTPCRow& r2=sec[(ns+1)%max_sec][i2];
463 cl=r2[js-nl-nm];
3c0f9266 464 y2=cl->fY; z2=cl->fZ;
465 tmp=x2*cs-y2*sn;
466 y2 =x2*sn+y2*cs; x2=tmp;
fe4da5cc 467 }
3c0f9266 468
469 double d=(x2-x1)*(0.-y2)-(0.-x2)*(y2-y1);
470 if (d==0.) {cerr<<"MakeSeeds warning: Straight seed !\n"; continue;}
471
fe4da5cc 472 x(0)=y1;
473 x(1)=z1;
474 x(2)=f1(x1,y1,x2,y2,0.,0.);
475 x(3)=f2(x1,y1,x2,y2,0.,0.);
476 x(4)=f3(x1,y1,x2,y2,z1,z2);
477
478 if (TMath::Abs(x(2)*x1-x(3)) >= 0.999) continue;
479
480 if (TMath::Abs(x(4)) > 1.2) continue;
8c555625 481
fe4da5cc 482 Double_t a=asin(x(3));
fe4da5cc 483 Double_t zv=z1 - x(4)/x(2)*(a+asin(x(2)*x1-x(3)));
484 if (TMath::Abs(zv)>33.) continue;
8c555625 485
fe4da5cc 486 TMatrix X(6,6); X=0.;
487 X(0,0)=r1[is]->fSigmaY2; X(1,1)=r1[is]->fSigmaZ2;
488 X(2,2)=cl->fSigmaY2; X(3,3)=cl->fSigmaZ2;
489 X(4,4)=3./12.; X(5,5)=3./12.;
490 TMatrix F(5,6); F.UnitMatrix();
491 Double_t sy=sqrt(X(0,0)), sz=sqrt(X(1,1));
492 F(2,0)=(f1(x1,y1+sy,x2,y2,0.,0.)-x(2))/sy;
493 F(2,2)=(f1(x1,y1,x2,y2+sy,0.,0.)-x(2))/sy;
494 F(2,4)=(f1(x1,y1,x2,y2,0.,0.+sy)-x(2))/sy;
495 F(3,0)=(f2(x1,y1+sy,x2,y2,0.,0.)-x(3))/sy;
496 F(3,2)=(f2(x1,y1,x2,y2+sy,0.,0.)-x(3))/sy;
497 F(3,4)=(f2(x1,y1,x2,y2,0.,0.+sy)-x(3))/sy;
498 F(4,0)=(f3(x1,y1+sy,x2,y2,z1,z2)-x(4))/sy;
499 F(4,1)=(f3(x1,y1,x2,y2,z1+sz,z2)-x(4))/sz;
500 F(4,2)=(f3(x1,y1,x2,y2+sy,z1,z2)-x(4))/sy;
501 F(4,3)=(f3(x1,y1,x2,y2,z1,z2+sz)-x(4))/sz;
502 F(4,4)=0;
503 F(3,3)=0;
504
505 TMatrix t(F,TMatrix::kMult,X);
506 C.Mult(t,TMatrix(TMatrix::kTransposed,F));
8c555625 507
3c0f9266 508 AliTPCtrack *track=new AliTPCtrack(r1[is], x, C, x1, ns*alpha+shift);
509 int rc=FindProlongation(*track,sec,ns,i2);
8c555625 510 if (rc<0 || *track<(i1-i2)/2) delete track;
511 else seeds.AddLast(track);
fe4da5cc 512 }
513 }
514 }
515}
516
517//_____________________________________________________________________________
3c0f9266 518AliTPCParam *AliTPCSector::param;
fe4da5cc 519void AliTPC::Clusters2Tracks()
520{
3c0f9266 521 //-----------------------------------------------------------------
522 // This is a track finder.
fe4da5cc 523 //
3c0f9266 524 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
525 //-----------------------------------------------------------------
fe4da5cc 526 if (!fClusters) return;
8c555625 527
528 AliTPCParam *p=&fDigParam->GetParam();
3c0f9266 529 AliTPCSector::SetParam(p);
8c555625 530
3c0f9266 531 const int nis=p->GetNInnerSector()/2;
532 AliTPCSSector *ssec=new AliTPCSSector[nis];
533 int nrow_low=ssec->GetNRows();
8c555625 534
3c0f9266 535 const int nos=p->GetNOuterSector()/2;
536 AliTPCLSector *lsec=new AliTPCLSector[nos];
537 int nrow_up=lsec->GetNRows();
8c555625 538
fe4da5cc 539 int ncl=fClusters->GetEntriesFast();
540 while (ncl--) {
541 AliTPCcluster *c=(AliTPCcluster*)fClusters->UncheckedAt(ncl);
3c0f9266 542 Int_t sec=c->fSector, row=c->fPadRow;
543 if (sec<nis*2) {
544 ssec[sec%nis][row].InsertCluster(c);
fe4da5cc 545 } else {
3c0f9266 546 sec -= nis*2;
547 lsec[sec%nos][row].InsertCluster(c);
fe4da5cc 548 }
549 }
550
fe4da5cc 551 TObjArray seeds(20000);
3c0f9266 552
553 int nrows=nrow_low+nrow_up;
554 int gap=int(0.125*nrows), shift=int(0.5*gap);
555 MakeSeeds(seeds, lsec, nos, nrow_up-1, nrow_up-1-gap);
556 MakeSeeds(seeds, lsec, nos, nrow_up-1-shift, nrow_up-1-shift-gap);
8c555625 557
fe4da5cc 558 seeds.Sort();
559
560 int found=0;
561 int nseed=seeds.GetEntriesFast();
562
563 for (int s=0; s<nseed; s++) {
564 AliTPCtrack& t=*((AliTPCtrack*)seeds.UncheckedAt(s));
3c0f9266 565 double alpha=t.GetAlpha();
fe4da5cc 566 if (alpha > 2.*TMath::Pi()) alpha -= 2.*TMath::Pi();
567 if (alpha < 0. ) alpha += 2.*TMath::Pi();
3c0f9266 568 int ns=int(alpha/lsec->GetAlpha())%nos;
569
570 if (!FindProlongation(t,lsec,ns)) continue;
571
572 alpha=t.GetAlpha() + 0.5*ssec->GetAlpha() - ssec->GetAlphaShift();
573 if (alpha > 2.*TMath::Pi()) alpha -= 2.*TMath::Pi();
574 if (alpha < 0. ) alpha += 2.*TMath::Pi();
575 ns=int(alpha/ssec->GetAlpha())%nis; //index of the inner sector needed
576
577 alpha=ns*ssec->GetAlpha() - t.GetAlpha();
578 if (!t.Rotate(alpha)) continue;
579
580 if (!FindProlongation(t,ssec,ns)) continue;
fe4da5cc 581
3c0f9266 582 if (t < int(0.4*nrows)) continue;
fe4da5cc 583
584 AddTrack(t);
585 t.UseClusters();
586 cerr<<found++<<'\r';
587 }
3c0f9266 588
589 delete[] ssec;
590 delete[] lsec;
fe4da5cc 591}
592
593//_____________________________________________________________________________
594void AliTPC::CreateMaterials()
595{
8c555625 596 //-----------------------------------------------
fe4da5cc 597 // Create Materials for for TPC
8c555625 598 //-----------------------------------------------
599
600 //-----------------------------------------------------------------
601 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
602 //-----------------------------------------------------------------
1283eee5 603
fe4da5cc 604 Int_t ISXFLD=gAlice->Field()->Integ();
605 Float_t SXMGMX=gAlice->Field()->Max();
1283eee5 606
607 Float_t amat[5]; // atomic numbers
608 Float_t zmat[5]; // z
609 Float_t wmat[5]; // proportions
610
611 Float_t density;
612
613 // ********************* Gases *******************
614
615 //--------------------------------------------------------------
616 // pure gases
617 //--------------------------------------------------------------
618
619 // Ne
620
621
622 Float_t a_ne = 20.18;
623 Float_t z_ne = 10.;
fe4da5cc 624
1283eee5 625 density = 0.0009;
626
627 AliMaterial(20,"Ne",a_ne,z_ne,density,999.,999.);
628
629 // Ar
630
631 Float_t a_ar = 39.948;
632 Float_t z_ar = 18.;
633
634 density = 0.001782;
635
636 AliMaterial(21,"Ar",a_ar,z_ar,density,999.,999.);
637
638 Float_t a_pure[2];
fe4da5cc 639
1283eee5 640 a_pure[0] = a_ne;
641 a_pure[1] = a_ar;
fe4da5cc 642
1283eee5 643
644 //--------------------------------------------------------------
645 // gases - compounds
646 //--------------------------------------------------------------
647
648 Float_t amol[3];
649
650 // CO2
651
652 amat[0]=12.011;
653 amat[1]=15.9994;
654
655 zmat[0]=6.;
656 zmat[1]=8.;
657
658 wmat[0]=1.;
659 wmat[1]=2.;
660
661 density=0.001977;
662
663 amol[0] = amat[0]*wmat[0]+amat[1]*wmat[1];
664
665 AliMixture(10,"CO2",amat,zmat,density,-2,wmat);
666
667 // CF4
668
669 amat[0]=12.011;
670 amat[1]=18.998;
671
672 zmat[0]=6.;
673 zmat[1]=9.;
674
675 wmat[0]=1.;
676 wmat[1]=4.;
677
678 density=0.003034;
679
680 amol[1] = amat[0]*wmat[0]+amat[1]*wmat[1];
681
682 AliMixture(11,"CF4",amat,zmat,density,-2,wmat);
683
684 // CH4
685
686 amat[0]=12.011;
687 amat[1]=1.;
688
689 zmat[0]=6.;
690 zmat[1]=1.;
691
692 wmat[0]=1.;
693 wmat[1]=4.;
694
695 density=0.000717;
696
697 amol[2] = amat[0]*wmat[0]+amat[1]*wmat[1];
698
699 AliMixture(12,"CH4",amat,zmat,density,-2,wmat);
700
701 //----------------------------------------------------------------
702 // gases - mixtures, ID >= 20 pure gases, <= 10 ID < 20 -compounds
703 //----------------------------------------------------------------
704
fe4da5cc 705 char namate[21];
1283eee5 706
707 density = 0.;
708 Float_t am=0;
709 Int_t nc;
710
711 Float_t a,z,rho,absl,X0,buf[1];
712 Int_t nbuf;
713
714 for(nc = 0;nc<fNoComp;nc++)
715 {
716
717 // retrive material constants
718
719 gMC->Gfmate((*fIdmate)[fMixtComp[nc]],namate,a,z,rho,X0,absl,buf,nbuf);
720
721 amat[nc] = a;
722 zmat[nc] = z;
723
724 Int_t nnc = (fMixtComp[nc]>=20) ? fMixtComp[nc]%20 : fMixtComp[nc]%10;
725
726 am += fMixtProp[nc]*((fMixtComp[nc]>=20) ? a_pure[nnc] : amol[nnc]);
727 density += fMixtProp[nc]*rho; // density of the mixture
728
729 }
730
731 // mixture proportions by weight!
732
733 for(nc = 0;nc<fNoComp;nc++)
734 {
735
736 Int_t nnc = (fMixtComp[nc]>=20) ? fMixtComp[nc]%20 : fMixtComp[nc]%10;
737
738 wmat[nc] = fMixtProp[nc]*((fMixtComp[nc]>=20) ? a_pure[nnc] : amol[nnc])/am;
739
740 }
fe4da5cc 741
1283eee5 742 AliMixture(31,"Drift gas 1",amat,zmat,density,fNoComp,wmat);
743 AliMixture(32,"Drift gas 2",amat,zmat,density,fNoComp,wmat);
744 AliMixture(33,"Drift gas 3",amat,zmat,density,fNoComp,wmat);
745
746 AliMedium(2, "Drift gas 1", 31, 0, ISXFLD, SXMGMX, 10., 999.,.1, .001, .001);
747 AliMedium(3, "Drift gas 2", 32, 0, ISXFLD, SXMGMX, 10., 999.,.1, .001, .001);
748 AliMedium(4, "Drift gas 3", 33, 1, ISXFLD, SXMGMX, 10., 999.,.1, .001, .001);
749
750 // Air
751
752 AliMaterial(24, "Air", 14.61, 7.3, .001205, 30420., 67500.);
753
754 AliMedium(24, "Air", 24, 0, ISXFLD, SXMGMX, 10., .1, .1, .1, .1);
755
756 //----------------------------------------------------------------------
757 // solid materials
758 //----------------------------------------------------------------------
759
760 // Al
761
762 AliMaterial(30, "Al", 26.98, 13., 2.7, 8.9, 37.2);
763
764 AliMedium(0, "Al",30, 0, ISXFLD, SXMGMX, 10., .1, .1, .1, .1);
765
766 // Si
767
768 AliMaterial(31, "Si", 28.086, 14.,2.33, 9.36, 999.);
769
770 AliMedium(7, "Al",31, 0, ISXFLD, SXMGMX, 10., .1, .1, .1, .1);
fe4da5cc 771
1283eee5 772
773 // Mylar C5H4O2
774
775 amat[0]=12.011;
776 amat[1]=1.;
777 amat[2]=15.9994;
778
779 zmat[0]=6.;
780 zmat[1]=1.;
781 zmat[2]=8.;
782
783 wmat[0]=5.;
784 wmat[1]=4.;
785 wmat[2]=2.;
786
787 density = 1.39;
fe4da5cc 788
1283eee5 789 AliMixture(32, "Mylar",amat,zmat,density,-3,wmat);
790
791 AliMedium(5, "Mylar",32, 0, ISXFLD, SXMGMX, 10., .1, .1, .001, .01);
792
793
794
795
796 // Carbon (normal)
797
798 AliMaterial(33,"C normal",12.011,6.,2.265,18.8,999.);
799
800 AliMedium(6,"C normal",33,0, ISXFLD, SXMGMX, 10., .1, .1, .001, .01);
801
802 // G10 for inner and outr field cage
803 // G10 is 60% SiO2 + 40% epoxy, right now I use A and Z for SiO2
804
805 Float_t rhoFactor;
806
807 amat[0]=28.086;
808 amat[1]=15.9994;
809
810 zmat[0]=14.;
811 zmat[1]=8.;
812
813 wmat[0]=1.;
814 wmat[1]=2.;
815
816 density = 1.7;
fe4da5cc 817
1283eee5 818
819 AliMixture(34,"G10 aux.",amat,zmat,density,-2,wmat);
820
821
822 gMC->Gfmate((*fIdmate)[34],namate,a,z,rho,X0,absl,buf,nbuf);
823
824 Float_t thickX0 = 0.0052; // field cage in X0 units
fe4da5cc 825
1283eee5 826 Float_t thick = 2.; // in cm
827
828 X0=19.4; // G10
829
830 rhoFactor = X0*thickX0/thick;
831 density = rho*rhoFactor;
832
833 AliMaterial(35,"G10-fc",a,z,density,999.,999.);
834
835 AliMedium(8,"G10-fc",35,0, ISXFLD, SXMGMX, 10., .1, .1, .001, .01);
836
837 thickX0 = 0.0027; // inner vessel (eta <0.9)
838 thick=0.5;
839 rhoFactor = X0*thickX0/thick;
840 density = rho*rhoFactor;
841
842 AliMaterial(36,"G10-iv",a,z,density,999.,999.);
843
844 AliMedium(9,"G10-iv",36,0, ISXFLD, SXMGMX, 10., .1, .1, .001, .01);
845
846 // Carbon fibre
fe4da5cc 847
1283eee5 848 gMC->Gfmate((*fIdmate)[33],namate,a,z,rho,X0,absl,buf,nbuf);
849
850 thickX0 = 0.0133; // outer vessel
851 thick=3.0;
852 rhoFactor = X0*thickX0/thick;
853 density = rho*rhoFactor;
854
855
856 AliMaterial(37,"C-ov",a,z,density,999.,999.);
857
858 AliMedium(10,"C-ov",37,0, ISXFLD, SXMGMX, 10., .1, .1, .001, .01);
859
860 thickX0=0.015; // inner vessel (cone, eta > 0.9)
861 thick=1.5;
862 rhoFactor = X0*thickX0/thick;
863 density = rho*rhoFactor;
864
865 AliMaterial(38,"C-ivc",a,z,density,999.,999.);
866
867 AliMedium(11,"C-ivc",38,0, ISXFLD, SXMGMX, 10., .1, .1, .001, .01);
868
869 //
870
871 AliMedium(12,"CO2",10,0, ISXFLD, SXMGMX, 10., 999.,.1, .001, .001);
872
873
874
fe4da5cc 875}
876
877//_____________________________________________________________________________
878struct Bin {
879 const AliTPCdigit *dig;
880 int idx;
881 Bin() {dig=0; idx=-1;}
882};
883
884struct PreCluster : public AliTPCcluster {
3c0f9266 885 const AliTPCdigit* summit; //pointer to the maximum digit of this precluster
886 int idx; //index in AliTPC::fClusters
887 int npeaks; //number of peaks in this precluster
888 int ndigits; //number of digits in this precluster
889 PreCluster();
fe4da5cc 890};
3c0f9266 891PreCluster::PreCluster() : AliTPCcluster() {npeaks=ndigits=0;}
fe4da5cc 892
893//_____________________________________________________________________________
3c0f9266 894static void FindPreCluster(int i,int j,int maxj,Bin *bins,PreCluster &c)
fe4da5cc 895{
3c0f9266 896 //-----------------------------------------------------------------
897 // This function looks for "preclusters".
fe4da5cc 898 //
3c0f9266 899 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
900 //-----------------------------------------------------------------
901 Bin& b=bins[i*maxj+j];
902 double q=(double)TMath::Abs(b.dig->fSignal);
8c555625 903
fe4da5cc 904 if (b.idx >= 0 && b.idx != c.idx) {
905 c.idx=b.idx;
906 c.npeaks++;
907 }
908
909 if (q > TMath::Abs(c.summit->fSignal)) c.summit=b.dig;
910
911 c.fY += i*q;
912 c.fZ += j*q;
913 c.fSigmaY2 += i*i*q;
914 c.fSigmaZ2 += j*j*q;
915 c.fQ += q;
3c0f9266 916 c.ndigits++;
8c555625 917
fe4da5cc 918 b.dig = 0; b.idx = c.idx;
919
3c0f9266 920 if (bins[(i-1)*maxj+j].dig) FindPreCluster(i-1,j,maxj,bins,c);
921 if (bins[i*maxj+(j-1)].dig) FindPreCluster(i,j-1,maxj,bins,c);
922 if (bins[(i+1)*maxj+j].dig) FindPreCluster(i+1,j,maxj,bins,c);
923 if (bins[i*maxj+(j+1)].dig) FindPreCluster(i,j+1,maxj,bins,c);
fe4da5cc 924
925}
926
927//_____________________________________________________________________________
928void AliTPC::Digits2Clusters()
929{
3c0f9266 930 //-----------------------------------------------------------------
931 // This is a simple cluster finder.
fe4da5cc 932 //
3c0f9266 933 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
934 //-----------------------------------------------------------------
935 AliTPCParam *par = &(fDigParam->GetParam());
8c555625 936
3c0f9266 937 int inp=par->GetNPads(0, par->GetNRowLow()-1);
938 int onp=par->GetNPads(par->GetNSector()-1,par->GetNRowUp() -1);
939 const int MAXY=(inp>onp) ? inp+2 : onp+2;
940 const int MAXTBKT=int((z_end+6*par->GetZSigma())/par->GetZWidth())+1;
941 const int MAXZ=MAXTBKT+2;
942 const int THRESHOLD=20;
fe4da5cc 943
8c555625 944 TTree *t=(TTree*)gDirectory->Get("TreeD0_Param1");
945 t->GetBranch("Digits")->SetAddress(&fDigits);
fe4da5cc 946 Int_t sectors_by_rows=(Int_t)t->GetEntries();
947
948 int ncls=0;
949
950 for (Int_t n=0; n<sectors_by_rows; n++) {
951 if (!t->GetEvent(n)) continue;
3c0f9266 952 Bin *bins=new Bin[MAXY*MAXZ];
fe4da5cc 953 AliTPCdigit *dig=(AliTPCdigit*)fDigits->UncheckedAt(0);
3c0f9266 954 int sec=dig->fSector, row=dig->fPadRow;
955 int ndigits=fDigits->GetEntriesFast();
fe4da5cc 956
3c0f9266 957 int npads, sign;
958 {
959 int nis=par->GetNInnerSector(), nos=par->GetNOuterSector();
960 if (sec < nis) {
961 npads = par->GetNPadsLow(row);
962 sign = (sec < nis/2) ? 1 : -1;
963 } else {
964 npads = par->GetNPadsUp(row);
965 sign = ((sec-nis) < nos/2) ? 1 : -1;
966 }
fe4da5cc 967 }
3c0f9266 968
fe4da5cc 969 int ndig;
970 for (ndig=0; ndig<ndigits; ndig++) {
971 dig=(AliTPCdigit*)fDigits->UncheckedAt(ndig);
3c0f9266 972 int i=dig->fPad+1, j=dig->fTime+1;
973 if (i > npads) {
974 cerr<<"AliTPC::Digits2Clusters error: pad number is out of range ! ";
975 cerr<<i<<' '<<npads<<endl;
976 continue;
977 }
978 if (j > MAXTBKT) {
979 cerr<<"AliTPC::Digits2Clusters error: time bucket is out of range ! ";
980 cerr<<j<<' '<<MAXTBKT<<endl;
981 continue;
982 }
983 if (dig->fSignal >= THRESHOLD) bins[i*MAXZ+j].dig=dig;
984 if (i==1 || i==npads || j==1 || j==MAXTBKT) dig->fSignal*=-1;
fe4da5cc 985 }
3c0f9266 986
fe4da5cc 987 int ncl=0;
988 int i,j;
8c555625 989
3c0f9266 990 for (i=1; i<MAXY-1; i++) {
991 for (j=1; j<MAXZ-1; j++) {
992 if (bins[i*MAXZ+j].dig == 0) continue;
993 PreCluster c; c.summit=bins[i*MAXZ+j].dig; c.idx=ncls;
994 FindPreCluster(i, j, MAXZ, bins, c);
fe4da5cc 995 c.fY /= c.fQ;
996 c.fZ /= c.fQ;
8c555625 997
998 double s2 = c.fSigmaY2/c.fQ - c.fY*c.fY;
999 c.fSigmaY2 = s2 + 1./12.;
3c0f9266 1000 c.fSigmaY2 *= par->GetPadPitchWidth()*par->GetPadPitchWidth();
1001 if (s2 != 0.) c.fSigmaY2 *= 0.17;
8c555625 1002
1003 s2 = c.fSigmaZ2/c.fQ - c.fZ*c.fZ;
1004 c.fSigmaZ2 = s2 + 1./12.;
3c0f9266 1005 c.fSigmaZ2 *= par->GetZWidth()*par->GetZWidth();
1006 if (s2 != 0.) c.fSigmaZ2 *= 0.41;
1007
1008 c.fY = (c.fY - 0.5 - 0.5*npads)*par->GetPadPitchWidth();
1009 c.fZ = par->GetZWidth()*c.fZ;
1010 c.fZ -= 3.*par->GetZSigma(); // PASA delay
1011 c.fZ = sign*(z_end - c.fZ);
1012
1013 c.fSector=sec;
1014 c.fPadRow=row;
fe4da5cc 1015 c.fTracks[0]=c.summit->fTracks[0];
1016 c.fTracks[1]=c.summit->fTracks[1];
1017 c.fTracks[2]=c.summit->fTracks[2];
8c555625 1018
3c0f9266 1019 if (c.summit->fSignal<0) {
fe4da5cc 1020 c.fSigmaY2 *= 25.;
1021 c.fSigmaZ2 *= 4.;
1022 }
1023
1024 AddCluster(c); ncls++; ncl++;
1025 }
1026 }
3c0f9266 1027
fe4da5cc 1028 for (ndig=0; ndig<ndigits; ndig++) {
1029 dig=(AliTPCdigit*)fDigits->UncheckedAt(ndig);
3c0f9266 1030 int i=dig->fPad+1, j=dig->fTime+1;
1031 if (i > npads) {
1032 cerr<<"AliTPC::Digits2Clusters error: pad number is out of range ! ";
1033 cerr<<i<<' '<<npads<<endl;
1034 continue;
1035 }
1036 if (j > MAXTBKT) {
1037 cerr<<"AliTPC::Digits2Clusters error: time bucket is out of range ! ";
1038 cerr<<j<<' '<<MAXTBKT<<endl;
1039 continue;
1040 }
1041 if (TMath::Abs(dig->fSignal)>=par->GetZeroSup()) bins[i*MAXZ+j].dig=dig;
fe4da5cc 1042 }
1043
3c0f9266 1044 for (i=1; i<MAXY-1; i++) {
1045 for (j=1; j<MAXZ-1; j++) {
1046 if (bins[i*MAXZ+j].dig == 0) continue;
1047 PreCluster c; c.summit=bins[i*MAXZ+j].dig; c.idx=ncls;
1048 FindPreCluster(i, j, MAXZ, bins, c);
1049 if (c.ndigits < 2) continue; //noise cluster
8c555625 1050 if (c.npeaks>1) continue; //overlapped cluster
fe4da5cc 1051 c.fY /= c.fQ;
1052 c.fZ /= c.fQ;
8c555625 1053
1054 double s2 = c.fSigmaY2/c.fQ - c.fY*c.fY;
1055 c.fSigmaY2 = s2 + 1./12.;
3c0f9266 1056 c.fSigmaY2 *= par->GetPadPitchWidth()*par->GetPadPitchWidth();
1057 if (s2 != 0.) c.fSigmaY2 *= 0.04;
8c555625 1058
1059 s2 = c.fSigmaZ2/c.fQ - c.fZ*c.fZ;
1060 c.fSigmaZ2 = s2 + 1./12.;
3c0f9266 1061 c.fSigmaZ2 *= par->GetZWidth()*par->GetZWidth();
1062 if (s2 != 0.) c.fSigmaZ2 *= 0.10;
1063
1064 c.fY = (c.fY - 0.5 - 0.5*npads)*par->GetPadPitchWidth();
1065 c.fZ = par->GetZWidth()*c.fZ;
1066 c.fZ -= 3.*par->GetZSigma(); // PASA delay
1067 c.fZ = sign*(z_end - c.fZ);
1068
1069 c.fSector=sec;
1070 c.fPadRow=row;
fe4da5cc 1071 c.fTracks[0]=c.summit->fTracks[0];
1072 c.fTracks[1]=c.summit->fTracks[1];
1073 c.fTracks[2]=c.summit->fTracks[2];
1074
3c0f9266 1075 if (c.summit->fSignal<0) {
fe4da5cc 1076 c.fSigmaY2 *= 25.;
1077 c.fSigmaZ2 *= 4.;
1078 }
3c0f9266 1079
fe4da5cc 1080 if (c.npeaks==0) {AddCluster(c); ncls++; ncl++;}
1081 else {
1082 new ((*fClusters)[c.idx]) AliTPCcluster(c);
1083 }
1084 }
1085 }
1086
1087 cerr<<"sector, row, digits, clusters: "
3c0f9266 1088 <<sec<<' '<<row<<' '<<ndigits<<' '<<ncl<<" \r";
fe4da5cc 1089
1090 fDigits->Clear();
3c0f9266 1091
1092 delete[] bins;
fe4da5cc 1093 }
1094}
1095
1096//_____________________________________________________________________________
1097void AliTPC::ElDiff(Float_t *xyz)
1098{
8c555625 1099 //--------------------------------------------------
fe4da5cc 1100 // calculates the diffusion of a single electron
8c555625 1101 //--------------------------------------------------
1102
1103 //-----------------------------------------------------------------
1104 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
1105 //-----------------------------------------------------------------
1106 AliTPCParam * fTPCParam = &(fDigParam->GetParam());
fe4da5cc 1107 Float_t driftl;
8c555625 1108
fe4da5cc 1109 Float_t z0=xyz[2];
8c555625 1110
fe4da5cc 1111 driftl=z_end-TMath::Abs(xyz[2]);
8c555625 1112
fe4da5cc 1113 if(driftl<0.01) driftl=0.01;
8c555625 1114
1115 // check the attachment
1116
fe4da5cc 1117 driftl=TMath::Sqrt(driftl);
8c555625 1118
1119 // Float_t sig_t = driftl*diff_t;
1120 //Float_t sig_l = driftl*diff_l;
1121 Float_t sig_t = driftl*fTPCParam->GetDiffT();
1122 Float_t sig_l = driftl*fTPCParam->GetDiffL();
fe4da5cc 1123 xyz[0]=gRandom->Gaus(xyz[0],sig_t);
1124 xyz[1]=gRandom->Gaus(xyz[1],sig_t);
1125 xyz[2]=gRandom->Gaus(xyz[2],sig_l);
8c555625 1126
fe4da5cc 1127 if (TMath::Abs(xyz[2])>z_end){
8c555625 1128 xyz[2]=TMath::Sign(z_end,z0);
fe4da5cc 1129 }
1130 if(xyz[2]*z0 < 0.){
8c555625 1131 Float_t eps = 0.0001;
1132 xyz[2]=TMath::Sign(eps,z0);
fe4da5cc 1133 }
1134}
1135
1136//_____________________________________________________________________________
1137void AliTPC::Hits2Clusters()
1138{
8c555625 1139 //--------------------------------------------------------
fe4da5cc 1140 // TPC simple cluster generator from hits
1141 // obtained from the TPC Fast Simulator
8c555625 1142 // The point errors are taken from the parametrization
1143 //--------------------------------------------------------
1144
1145 //-----------------------------------------------------------------
1146 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
1147 //-----------------------------------------------------------------
3c0f9266 1148
8c555625 1149 AliTPCParam * fTPCParam = &(fDigParam->GetParam());
fe4da5cc 1150 Float_t sigma_rphi,sigma_z,cl_rphi,cl_z;
1151 //
1578254f 1152 TParticle *particle; // pointer to a given particle
fe4da5cc 1153 AliTPChit *tpcHit; // pointer to a sigle TPC hit
1154 TClonesArray *Particles; //pointer to the particle list
1155 Int_t sector,nhits;
1156 Int_t ipart;
1157 Float_t xyz[5];
1158 Float_t pl,pt,tanth,rpad,ratio;
fe4da5cc 1159 Float_t cph,sph;
1160
1161 //---------------------------------------------------------------
1162 // Get the access to the tracks
1163 //---------------------------------------------------------------
1164
1165 TTree *TH = gAlice->TreeH();
1166 Stat_t ntracks = TH->GetEntries();
3c0f9266 1167 Particles=gAlice->Particles();
fe4da5cc 1168
1169 //------------------------------------------------------------
1170 // Loop over all sectors (72 sectors)
3c0f9266 1171 // Sectors 0-35 are lower sectors, 0-17 z>0, 18-35 z<0
1172 // Sectors 36-71 are upper sectors, 36-53 z>0, 54-71 z<0
fe4da5cc 1173 //
3c0f9266 1174 // First cluster for sector 0 starts at "0"
fe4da5cc 1175 //------------------------------------------------------------
1176
1177
3c0f9266 1178 //fClustersIndex[0] = 0;
fe4da5cc 1179
1180 //
3c0f9266 1181 int Nsectors=fDigParam->GetParam().GetNSector();
1182 for(Int_t isec=0; isec<Nsectors; isec++){
8c555625 1183 //MI change
1184 fTPCParam->AdjustAngles(isec,cph,sph);
fe4da5cc 1185
1186 //------------------------------------------------------------
1187 // Loop over tracks
1188 //------------------------------------------------------------
1189
1190 for(Int_t track=0;track<ntracks;track++){
1191 ResetHits();
1192 TH->GetEvent(track);
1193 //
1194 // Get number of the TPC hits and a pointer
1195 // to the particles
1196 //
1197 nhits=fHits->GetEntriesFast();
fe4da5cc 1198 //
1199 // Loop over hits
1200 //
1201 for(Int_t hit=0;hit<nhits;hit++){
1202 tpcHit=(AliTPChit*)fHits->UncheckedAt(hit);
1203 sector=tpcHit->fSector; // sector number
1204 if(sector != isec) continue; //terminate iteration
1205 ipart=tpcHit->fTrack;
1578254f 1206 particle=(TParticle*)Particles->UncheckedAt(ipart);
1207 pl=particle->Pz();
1208 pt=particle->Pt();
fe4da5cc 1209 if(pt < 1.e-9) pt=1.e-9;
1210 tanth=pl/pt;
1211 tanth = TMath::Abs(tanth);
1212 rpad=TMath::Sqrt(tpcHit->fX*tpcHit->fX + tpcHit->fY*tpcHit->fY);
1213 ratio=0.001*rpad/pt; // pt must be in MeV/c - historical reason
1214
1215 // space-point resolutions
1216
1217 sigma_rphi=SigmaY2(rpad,tanth,pt);
1218 sigma_z =SigmaZ2(rpad,tanth );
1219
1220 // cluster widths
1221
1222 cl_rphi=ac_rphi-bc_rphi*rpad*tanth+cc_rphi*ratio*ratio;
1223 cl_z=ac_z-bc_z*rpad*tanth+cc_z*tanth*tanth;
1224
1225 // temporary protection
1226
1227 if(sigma_rphi < 0.) sigma_rphi=0.4e-3;
1228 if(sigma_z < 0.) sigma_z=0.4e-3;
1229 if(cl_rphi < 0.) cl_rphi=2.5e-3;
1230 if(cl_z < 0.) cl_z=2.5e-5;
1231
1232 //
3c0f9266 1233 // smearing --> rotate sectors firstly,
fe4da5cc 1234 // then the inaccuracy in a X-Y plane is only along Y (pad row)!
1235 //
1236 Float_t xprim= tpcHit->fX*cph + tpcHit->fY*sph;
1237 Float_t yprim=-tpcHit->fX*sph + tpcHit->fY*cph;
1238 xyz[0]=gRandom->Gaus(yprim,TMath::Sqrt(sigma_rphi)); // y
3c0f9266 1239 Double_t alpha=(sector < fTPCParam->GetNInnerSector()) ?
1240 fTPCParam->GetInnerAngle() : fTPCParam->GetOuterAngle();
8c555625 1241 if (TMath::Abs(xyz[0]/xprim) > TMath::Tan(0.5*alpha)) xyz[0]=yprim;
fe4da5cc 1242 xyz[1]=gRandom->Gaus(tpcHit->fZ,TMath::Sqrt(sigma_z)); // z
8c555625 1243 if (TMath::Abs(xyz[1]) > 250) xyz[1]=tpcHit->fZ;
3c0f9266 1244 xyz[2]=tpcHit->fQ+1;// q; let it be not equal to zero (Y.Belikov)
fe4da5cc 1245 xyz[3]=sigma_rphi; // fSigmaY2
1246 xyz[4]=sigma_z; // fSigmaZ2
1283eee5 1247
fe4da5cc 1248 // and finally add the cluster
1283eee5 1249 Int_t tracks[5]={tpcHit->fTrack, -1, -1, sector, tpcHit->fPadRow};
fe4da5cc 1250 AddCluster(xyz,tracks);
1251
1252 } // end of loop over hits
1253 } // end of loop over tracks
1254
3c0f9266 1255 //fClustersIndex[isec] = fNclusters; // update clusters index
fe4da5cc 1256
1257 } // end of loop over sectors
1258
3c0f9266 1259 //fClustersIndex[fNsectors]--; // set end of the clusters buffer
fe4da5cc 1260
1261}
1262
8c555625 1263
1264void AliTPC::Hits2Digits()
1265{
1266
1267 //----------------------------------------------------
1268 // Loop over all sectors (72 sectors)
3c0f9266 1269 // Sectors 0-35 are lower sectors, 0-17 z>0, 18-35 z<0
1270 // Sectors 36-71 are upper sectors, 36-53 z>0, 54-71 z<0
8c555625 1271 //----
3c0f9266 1272 int Nsectors=fDigParam->GetParam().GetNSector();
1273 for(Int_t isec=0;isec<Nsectors;isec++) Hits2DigitsSector(isec);
8c555625 1274}
1275
1276
fe4da5cc 1277//_____________________________________________________________________________
8c555625 1278void AliTPC::Hits2DigitsSector(Int_t isec)
fe4da5cc 1279{
8c555625 1280 //-------------------------------------------------------------------
fe4da5cc 1281 // TPC conversion from hits to digits.
8c555625 1282 //-------------------------------------------------------------------
1283
1284 //-----------------------------------------------------------------
1285 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
1286 //-----------------------------------------------------------------
1287
fe4da5cc 1288 //-------------------------------------------------------
8c555625 1289 // Get the access to the track hits
fe4da5cc 1290 //-------------------------------------------------------
8c555625 1291
1292 AliTPCParam * fTPCParam = &(fDigParam->GetParam());
1293 TTree *TH = gAlice->TreeH(); // pointer to the hits tree
fe4da5cc 1294 Stat_t ntracks = TH->GetEntries();
8c555625 1295
1296 if( ntracks > 0){
1297
1298 //-------------------------------------------
1299 // Only if there are any tracks...
1300 //-------------------------------------------
1301
fe4da5cc 1302
8c555625 1303 // TObjArrays for three neighouring pad-rows
1304
1305 TObjArray **rowTriplet = new TObjArray* [3];
fe4da5cc 1306
8c555625 1307 // TObjArray-s for each pad-row
1308
1309 TObjArray **row;
1310
1311 for (Int_t trip=0;trip<3;trip++){
1312 rowTriplet[trip]=new TObjArray;
fe4da5cc 1313 }
8c555625 1314
1315
fe4da5cc 1316
8c555625 1317 printf("*** Processing sector number %d ***\n",isec);
1318
1319 Int_t nrows =fTPCParam->GetNRow(isec);
1320
1321 row= new TObjArray* [nrows];
fe4da5cc 1322
8c555625 1323 MakeSector(isec,nrows,TH,ntracks,row);
1324
1325 //--------------------------------------------------------
1326 // Digitize this sector, row by row
1327 // row[i] is the pointer to the TObjArray of TVectors,
1328 // each one containing electrons accepted on this
1329 // row, assigned into tracks
1330 //--------------------------------------------------------
1331
1332 Int_t i;
1333
1334 for (i=0;i<nrows;i++){
1335
1336 // Triplets for i = 0 and i=1 are identical!
1337 // The same for i = nrows-1 and nrows!
1338
1339 if(i != 1 && i != nrows-1){
1340 MakeTriplet(i,rowTriplet,row);
1341 }
1342
1343 DigitizeRow(i,isec,rowTriplet);
1344
1345 fDigParam->Fill();
1346
1347 Int_t ndig=fDigParam->GetArray()->GetEntriesFast();
1348
1349 printf("*** Sector, row, digits %d %d %d ***\n",isec,i,ndig);
1350
1351 ResetDigits(); // reset digits for this row after storing them
1352
1353 } // end of the sector digitization
1354
1355 // delete the last triplet
1356
1357 for (i=0;i<3;i++) rowTriplet[i]->Delete();
1358
1359 delete [] row; // delete the array of pointers to TObjArray-s
1360
1361 } // ntracks >0
1362} // end of Hits2Digits
1363//_____________________________________________________________________________
1364void AliTPC::MakeTriplet(Int_t row,
1365 TObjArray **rowTriplet, TObjArray **prow)
1366{
1367 //------------------------------------------------------------------
1368 // Makes the "triplet" of the neighbouring pad-row for the
1369 // digitization including the cross-talk between the pad-rows
1370 //------------------------------------------------------------------
1371
1372 //-----------------------------------------------------------------
1373 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
1374 //-----------------------------------------------------------------
1375
1376 AliTPCParam * fTPCParam = &(fDigParam->GetParam());
1377 Float_t gasgain = fTPCParam->GetGasGain();
1378 Int_t nTracks[3];
1379
1380 Int_t nElements,nElectrons;
1381
1382 TVector *pv;
1383 TVector *tv;
1384
1385 //-------------------------------------------------------------------
1386 // pv is an "old" track, i.e. label + triplets of (x,y,z)
1387 // for each electron
1388 //
1389 //-------------------------------------------------------------------
1390
1391
1392 Int_t i1,i2;
1393 Int_t nel,nt;
1394
1395 if(row == 0 || row == 1){
1396
1397 // create entire triplet for the first AND the second row
1398
1399 nTracks[0] = prow[0]->GetEntries();
1400 nTracks[1] = prow[1]->GetEntries();
1401 nTracks[2] = prow[2]->GetEntries();
1402
1403 for(i1=0;i1<3;i1++){
1404 nt = nTracks[i1]; // number of tracks for this row
1405
1406 for(i2=0;i2<nt;i2++){
1407 pv = (TVector*)prow[i1]->At(i2);
1408 TVector &v1 = *pv;
1409 nElements = pv->GetNrows();
1410 nElectrons = (nElements-1)/3;
1411
1412 tv = new TVector(4*nElectrons+1); // create TVector for a modified track
1413 TVector &v2 = *tv;
1414 v2(0)=v1(0); //track label
1415
1416 for(nel=0;nel<nElectrons;nel++){
1417 Int_t idx1 = nel*3;
1418 Int_t idx2 = nel*4;
1419 // Avalanche, including fluctuations
1420 Int_t aval = (Int_t) (-gasgain*TMath::Log(gRandom->Rndm()));
1421 v2(idx2+1)= v1(idx1+1);
1422 v2(idx2+2)= v1(idx1+2);
1423 v2(idx2+3)= v1(idx1+3);
1424 v2(idx2+4)= (Float_t)aval; // in number of electrons!
1425 } // end of loop over electrons
1426 //
1427 // Add this track to a row
1428 //
1429
1430 rowTriplet[i1]->Add(tv);
1431
1432
1433 } // end of loop over tracks for this row
1434
1435 prow[i1]->Delete(); // remove "old" tracks
1436 delete prow[i1]; // delete TObjArray for this row
1437 prow[i1]=0; // set pointer to NULL
1438
1439 } // end of loop over row triplets
1440
1441
1442 }
1443 else{
1444
1445 rowTriplet[0]->Delete(); // remove old lower row
1446
1447 nTracks[0]=rowTriplet[1]->GetEntries(); // previous middle row
1448 nTracks[1]=rowTriplet[2]->GetEntries(); // previous upper row
1449 nTracks[2]=prow[row+1]->GetEntries(); // next row
1450
1451
1452 //-------------------------------------------
1453 // shift new tracks downwards
1454 //-------------------------------------------
1455
1456 for(i1=0;i1<nTracks[0];i1++){
1457 pv=(TVector*)rowTriplet[1]->At(i1);
1458 rowTriplet[0]->Add(pv);
1459 }
1460
1461 rowTriplet[1]->Clear(); // leave tracks on the heap!!!
1462
1463 for(i1=0;i1<nTracks[1];i1++){
1464 pv=(TVector*)rowTriplet[2]->At(i1);
1465 rowTriplet[1]->Add(pv);
1466 }
1467
1468 rowTriplet[2]->Clear(); // leave tracks on the heap!!!
1469
1470 //---------------------------------------------
1471 // Create new upper row
1472 //---------------------------------------------
1473
1474
1475
1476 for(i1=0;i1<nTracks[2];i1++){
1477 pv = (TVector*)prow[row+1]->At(i1);
1478 TVector &v1 = *pv;
1479 nElements = pv->GetNrows();
1480 nElectrons = (nElements-1)/3;
1481
1482 tv = new TVector(4*nElectrons+1); // create TVector for a modified track
1483 TVector &v2 = *tv;
1484 v2(0)=v1(0); //track label
1485
1486 for(nel=0;nel<nElectrons;nel++){
1487
1488 Int_t idx1 = nel*3;
1489 Int_t idx2 = nel*4;
1490 // Avalanche, including fluctuations
1491 Int_t aval = (Int_t)
1492 (-gasgain*TMath::Log(gRandom->Rndm()));
1493
1494 v2(idx2+1)= v1(idx1+1);
1495 v2(idx2+2)= v1(idx1+2);
1496 v2(idx2+3)= v1(idx1+3);
1497 v2(idx2+4)= (Float_t)aval; // in number of electrons!
1498 } // end of loop over electrons
1499
1500 rowTriplet[2]->Add(tv);
1501
1502 } // end of loop over tracks
1503
1504 prow[row+1]->Delete(); // delete tracks for this row
1505 delete prow[row+1]; // delete TObjArray for this row
1506 prow[row+1]=0; // set a pointer to NULL
1507
1508 }
1509
1510} // end of MakeTriplet
1511//_____________________________________________________________________________
1512void AliTPC::ExB(Float_t *xyz)
1513{
1514 //------------------------------------------------
1515 // ExB at the wires and wire number calulation
1516 //------------------------------------------------
1517
1518 //-----------------------------------------------------------------
1519 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
1520 //-----------------------------------------------------------------
1521 AliTPCParam * fTPCParam = &(fDigParam->GetParam());
1522
1523 Float_t x1=xyz[0];
1524 fTPCParam->GetWire(x1); //calculate nearest wire position
1525 Float_t dx=xyz[0]-x1;
1526 xyz[1]+=dx*fTPCParam->GetOmegaTau();
1527
1528} // end of ExB
1529//_____________________________________________________________________________
1530void AliTPC::DigitizeRow(Int_t irow,Int_t isec,TObjArray **rowTriplet)
1531{
1532 //-----------------------------------------------------------
1533 // Single row digitization, coupling from the neighbouring
1534 // rows taken into account
1535 //-----------------------------------------------------------
1536
1537 //-----------------------------------------------------------------
1538 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
1539 //-----------------------------------------------------------------
1540
1541
1542 AliTPCParam * fTPCParam = &(fDigParam->GetParam());
1543 Float_t chipgain= fTPCParam->GetChipGain();
1544 Float_t zerosup = fTPCParam->GetZeroSup();
1545 Int_t nrows =fTPCParam->GetNRow(isec);
3c0f9266 1546 const int MAXTBKT=
1547 int((z_end+6*fTPCParam->GetZSigma())/fTPCParam->GetZWidth())+1;
8c555625 1548
1549 Int_t nTracks[3];
1550 Int_t n_of_pads[3];
1551 Int_t IndexRange[4];
1552 Int_t i1;
1553 Int_t iFlag;
1554
1555 //
1556 // iFlag = 0 -> inner row, iFlag = 1 -> the middle one, iFlag = 2 -> the outer one
1557 //
1558
1559 nTracks[0]=rowTriplet[0]->GetEntries(); // lower row
1560 nTracks[1]=rowTriplet[1]->GetEntries(); // middle row
1561 nTracks[2]=rowTriplet[2]->GetEntries(); // upper row
1562
1563
1564 if(irow == 0){
1565 iFlag=0;
1566 n_of_pads[0]=fTPCParam->GetNPads(isec,0);
1567 n_of_pads[1]=fTPCParam->GetNPads(isec,1);
1568 }
1569 else if(irow == nrows-1){
1570 iFlag=2;
1571 n_of_pads[1]=fTPCParam->GetNPads(isec,irow-1);
1572 n_of_pads[2]=fTPCParam->GetNPads(isec,irow);
1573 }
1574 else {
1575 iFlag=1;
1576 for(i1=0;i1<3;i1++){
1577 n_of_pads[i1]=fTPCParam->GetNPads(isec,irow-1+i1);
1578 }
1579 }
1580
1581 //
1582 // Integrated signal for this row
1583 // and a single track signal
1584 //
1585
3c0f9266 1586 TMatrix *m1 = new TMatrix(0,n_of_pads[iFlag]-1,0,MAXTBKT-1); // integrated
1587 TMatrix *m2 = new TMatrix(0,n_of_pads[iFlag]-1,0,MAXTBKT-1); // single
8c555625 1588
1589 //
1590
1591 TMatrix &Total = *m1;
1592
1593 // Array of pointers to the label-signal list
1594
3c0f9266 1595 Int_t NofDigits = n_of_pads[iFlag]*MAXTBKT; // number of digits for this row
8c555625 1596
1597 Float_t **pList = new Float_t* [NofDigits];
1598
1599 Int_t lp;
1600
1601 for(lp=0;lp<NofDigits;lp++)pList[lp]=0; // set all pointers to NULL
1602
1603 //
1604 // Straight signal and cross-talk, cross-talk is integrated over all
1605 // tracks and added to the signal at the very end
1606 //
1607
1608
1609 for (i1=0;i1<nTracks[iFlag];i1++){
1610
1611 m2->Zero(); // clear single track signal matrix
1612
1613 Float_t TrackLabel =
1614 GetSignal(rowTriplet[iFlag],i1,n_of_pads[iFlag],m2,m1,IndexRange);
1615
1616 GetList(TrackLabel,n_of_pads[iFlag],m2,IndexRange,pList);
1617
1618 }
1619
1620 //
1621 // Cross talk from the neighbouring pad-rows
1622 //
1623
3c0f9266 1624 TMatrix *m3 = new TMatrix(0,n_of_pads[iFlag]-1,0,MAXTBKT-1); // cross-talk
8c555625 1625
1626 TMatrix &Cross = *m3;
1627
1628 if(iFlag == 0){
1629
1630 // cross-talk from the outer row only (first pad row)
1631
1632 GetCrossTalk(0,rowTriplet[1],nTracks[1],n_of_pads,m3);
1633
1634 }
1635 else if(iFlag == 2){
1636
1637 // cross-talk from the inner row only (last pad row)
1638
1639 GetCrossTalk(2,rowTriplet[1],nTracks[1],n_of_pads,m3);
1640
1641 }
1642 else{
1643
1644 // cross-talk from both inner and outer rows
1645
1646 GetCrossTalk(3,rowTriplet[0],nTracks[0],n_of_pads,m3); // inner
1647 GetCrossTalk(4,rowTriplet[2],nTracks[2],n_of_pads,m3); //outer
1648 }
1649
1650 Total += Cross; // add the cross-talk
1651
1652 //
1653 // Convert analog signal to ADC counts
1654 //
1655
1656 Int_t tracks[3];
1657 Int_t digits[5];
1658
1659
1283eee5 1660 for(Int_t ip=0;ip<n_of_pads[iFlag];ip++){
3c0f9266 1661 for(Int_t it=0;it<MAXTBKT;it++){
8c555625 1662
1663 Float_t q = Total(ip,it);
1664
1283eee5 1665 Int_t gi =it*n_of_pads[iFlag]+ip; // global index
8c555625 1666
1667 q = gRandom->Gaus(q,fTPCParam->GetNoise()); // apply noise
1668 q *= (q_el*1.e15); // convert to fC
1669 q *= chipgain; // convert to mV
1670 q *= (adc_sat/dyn_range); // convert to ADC counts
1671
1672 if(q <zerosup) continue; // do not fill zeros
1673 if(q > adc_sat) q = adc_sat; // saturation
1674
1675 //
1676 // "real" signal or electronic noise (list = -1)?
1677 //
1678
1679 for(Int_t j1=0;j1<3;j1++){
1680 tracks[j1] = (pList[gi]) ?(Int_t)(*(pList[gi]+j1)) : -1;
1681 }
1682
1683 digits[0]=isec;
1283eee5 1684 digits[1]=irow;
8c555625 1685 digits[2]=ip;
1686 digits[3]=it;
1687 digits[4]= (Int_t)q;
1688
1689 // Add this digit
1690
1691 AddDigit(tracks,digits);
1692
1693 } // end of loop over time buckets
1694 } // end of lop over pads
1695
1696 //
1697 // This row has been digitized, delete nonused stuff
1698 //
1699
1700 for(lp=0;lp<NofDigits;lp++){
1701 if(pList[lp]) delete [] pList[lp];
1702 }
1703
1704 delete [] pList;
1705
1706 delete m1;
1707 delete m2;
1708 delete m3;
1709
1710} // end of DigitizeRow
1711//_____________________________________________________________________________
1712Float_t AliTPC::GetSignal(TObjArray *p1, Int_t ntr, Int_t np, TMatrix *m1, TMatrix *m2,
1713 Int_t *IndexRange)
1714{
1715
1716 //---------------------------------------------------------------
1717 // Calculates 2-D signal (pad,time) for a single track,
1718 // returns a pointer to the signal matrix and the track label
1719 // No digitization is performed at this level!!!
1720 //---------------------------------------------------------------
1721
1722 //-----------------------------------------------------------------
1723 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
1724 //-----------------------------------------------------------------
1725
1726 TVector *tv;
1727 AliTPCParam * fTPCParam = &(fDigParam->GetParam());
1728 AliTPCPRF2D * fPRF2D = &(fDigParam->GetPRF2D());
1729 AliTPCRF1D * fRF = &(fDigParam->GetRF());
3c0f9266 1730 const int MAXTBKT=
1731 int((z_end+6*fTPCParam->GetZSigma())/fTPCParam->GetZWidth())+1;
8c555625 1732
1733 //to make the code faster we put parameters to the stack
1734
1735 Float_t zwidth = fTPCParam->GetZWidth();
7ee081c2 1736 Float_t zwidthm1 =1./zwidth;
8c555625 1737
1738 tv = (TVector*)p1->At(ntr); // pointer to a track
1739 TVector &v = *tv;
1740
1741 Float_t label = v(0);
1742
1283eee5 1743 Int_t CentralPad = (np-1)/2;
8c555625 1744 Int_t PadNumber;
1745 Int_t nElectrons = (tv->GetNrows()-1)/4;
1746 Float_t range=((np-1)/2 + 0.5)*fTPCParam->GetPadPitchWidth(); // pad range
8c555625 1747
1283eee5 1748 range -= 0.5; // dead zone, 5mm from the edge, according to H.G. Fischer
1749
8c555625 1750 Float_t IneffFactor = 0.5; // inefficiency in the gain close to the edge, as above
1751
1752
1753 Float_t PadSignal[7]; // signal from a single electron
1754
1755 TMatrix &signal = *m1;
1756 TMatrix &total = *m2;
1757
1758
1759 IndexRange[0]=9999; // min pad
1760 IndexRange[1]=-1; // max pad
1761 IndexRange[2]=9999; //min time
1762 IndexRange[3]=-1; // max time
1763
1764 //
1765 // Loop over all electrons
1766 //
1767
1768 for(Int_t nel=0; nel<nElectrons; nel++){
1769 Int_t idx=nel*4;
1770 Float_t xwire = v(idx+1);
1771 Float_t y = v(idx+2);
1772 Float_t z = v(idx+3);
1773
1774
1775 Float_t absy=TMath::Abs(y);
1776
1777 if(absy < 0.5*fTPCParam->GetPadPitchWidth()){
1778 PadNumber=CentralPad;
1779 }
1780 else if (absy < range){
8022212f 1781 PadNumber=(Int_t) ((absy-0.5*fTPCParam->GetPadPitchWidth())/fTPCParam->GetPadPitchWidth()+1.);
8c555625 1782 PadNumber=(Int_t) (TMath::Sign((Float_t)PadNumber, y)+CentralPad);
1783 }
1784 else continue; // electron out of pad-range , lost at the sector edge
1785
1786 Float_t aval = (absy<range-0.5) ? v(idx+4):v(idx+4)*IneffFactor;
1787
1788
1789 Float_t dist = y - (Float_t)(PadNumber-CentralPad)*fTPCParam->GetPadPitchWidth();
a03540ae 1790 for (Int_t i=0;i<7;i++){
b6738b36 1791 PadSignal[i]=fPRF2D->GetPRF(-dist+(i-3)*fTPCParam->GetPadPitchWidth(),xwire)*aval;
a03540ae 1792 PadSignal[i] *= fTPCParam->GetPadCoupling();
1793 }
8c555625 1794
1283eee5 1795 Int_t LeftPad = TMath::Max(0,PadNumber-3);
1796 Int_t RightPad = TMath::Min(np-1,PadNumber+3);
8c555625 1797
1798 Int_t pmin=LeftPad-PadNumber+3; // lower index of the pad_signal vector
1799 Int_t pmax=RightPad-PadNumber+3; // upper index
1800
1283eee5 1801 Float_t z_drift = z*zwidthm1;
8c555625 1802 Float_t z_offset = z_drift-(Int_t)z_drift;
3c0f9266 1803
1804 Int_t FirstBucket = (Int_t)z_drift; // numbering starts from "0"
8c555625 1805
1806
1807 // loop over time bins (4 bins is enough - 3 sigma truncated Gaussian)
3c0f9266 1808
8c555625 1809 for (Int_t i2=0;i2<4;i2++){
1810 Int_t TrueTime = FirstBucket+i2; // current time bucket
3c0f9266 1811 Float_t dz = (Float_t(i2)+1.-z_offset)*zwidth;
8c555625 1812 Float_t ampl = fRF->GetRF(dz);
3c0f9266 1813 if( (TrueTime>MAXTBKT-1) ) break; // beyond the time range
8c555625 1814
1815 IndexRange[2]=TMath::Min(IndexRange[2],TrueTime); // min time
1816 IndexRange[3]=TMath::Max(IndexRange[3],TrueTime); // max time
1817
1818 // loop over pads, from pmin to pmax
1819 for(Int_t i3=pmin;i3<=pmax;i3++){
1820 Int_t TruePad = LeftPad+i3-pmin;
1821 IndexRange[0]=TMath::Min(IndexRange[0],TruePad); // min pad
1822 IndexRange[1]=TMath::Max(IndexRange[1],TruePad); // max pad
1823 signal(TruePad,TrueTime)+=(PadSignal[i3]*ampl); // not converted to charge!!!
1824 total(TruePad,TrueTime)+=(PadSignal[i3]*ampl); // not converted to charge!!!
1825 } // end of pads loop
1826 } // end of time loop
1827 } // end of loop over electrons
1828
1829 return label; // returns track label when finished
1830}
1831
1832//_____________________________________________________________________________
1833void AliTPC::GetList(Float_t label,Int_t np,TMatrix *m,Int_t *IndexRange,
1834 Float_t **pList)
1835{
1836 //----------------------------------------------------------------------
1837 // Updates the list of tracks contributing to digits for a given row
1838 //----------------------------------------------------------------------
1839
1840 //-----------------------------------------------------------------
1841 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
1842 //-----------------------------------------------------------------
1843
1844 TMatrix &signal = *m;
1845
1846 // lop over nonzero digits
1847
1848 for(Int_t it=IndexRange[2];it<IndexRange[3]+1;it++){
1849 for(Int_t ip=IndexRange[0];ip<IndexRange[1]+1;ip++){
1850
1851
1283eee5 1852 Int_t GlobalIndex = it*np+ip; // GlobalIndex starts from 0!
8c555625 1853
1854 if(!pList[GlobalIndex]){
1855
1856 //
1857 // Create new list (6 elements - 3 signals and 3 labels),
1858 // but only if the signal is > 0.
1859 //
1860
1861 if(signal(ip,it)>0.){
1862
1863 pList[GlobalIndex] = new Float_t [6];
1864
1865 // set list to -1
1866
1867 *pList[GlobalIndex] = -1.;
1868 *(pList[GlobalIndex]+1) = -1.;
1869 *(pList[GlobalIndex]+2) = -1.;
1870 *(pList[GlobalIndex]+3) = -1.;
1871 *(pList[GlobalIndex]+4) = -1.;
1872 *(pList[GlobalIndex]+5) = -1.;
1873
1874
1875 *pList[GlobalIndex] = label;
1876 *(pList[GlobalIndex]+3) = signal(ip,it);}
1877 }
1878 else{
1879
1880 // check the signal magnitude
1881
1882 Float_t highest = *(pList[GlobalIndex]+3);
1883 Float_t middle = *(pList[GlobalIndex]+4);
1884 Float_t lowest = *(pList[GlobalIndex]+5);
1885
1886 //
1887 // compare the new signal with already existing list
1888 //
1889
1890 if(signal(ip,it)<lowest) continue; // neglect this track
1891
1892 //
1893
1894 if (signal(ip,it)>highest){
1895 *(pList[GlobalIndex]+5) = middle;
1896 *(pList[GlobalIndex]+4) = highest;
1897 *(pList[GlobalIndex]+3) = signal(ip,it);
1898
1899 *(pList[GlobalIndex]+2) = *(pList[GlobalIndex]+1);
1900 *(pList[GlobalIndex]+1) = *pList[GlobalIndex];
1901 *pList[GlobalIndex] = label;
1902 }
1903 else if (signal(ip,it)>middle){
1904 *(pList[GlobalIndex]+5) = middle;
1905 *(pList[GlobalIndex]+4) = signal(ip,it);
1906
1907 *(pList[GlobalIndex]+2) = *(pList[GlobalIndex]+1);
1908 *(pList[GlobalIndex]+1) = label;
1909 }
1910 else{
1911 *(pList[GlobalIndex]+5) = signal(ip,it);
1912 *(pList[GlobalIndex]+2) = label;
1913 }
1914 }
1915
1916 } // end of loop over pads
1917 } // end of loop over time bins
1918
1919
1920
1921
1922}//end of GetList
1923//___________________________________________________________________
1924void AliTPC::MakeSector(Int_t isec,Int_t nrows,TTree *TH,
1925 Stat_t ntracks,TObjArray **row)
1926{
1927
1928 //-----------------------------------------------------------------
1929 // Prepares the sector digitization, creates the vectors of
1930 // tracks for each row of this sector. The track vector
1931 // contains the track label and the position of electrons.
1932 //-----------------------------------------------------------------
1933
1934 //-----------------------------------------------------------------
1935 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
1936 //-----------------------------------------------------------------
1937
1938 AliTPCParam * fTPCParam = &(fDigParam->GetParam());
1939 Int_t i;
1940 Float_t xyz[3];
1941
1942 AliTPChit *tpcHit; // pointer to a sigle TPC hit
1943
1944 //----------------------------------------------
1945 // Create TObjArray-s, one for each row,
1946 // each TObjArray will store the TVectors
1947 // of electrons, one TVector per each track.
1948 //----------------------------------------------
1949
1950 for(i=0; i<nrows; i++){
1951 row[i] = new TObjArray;
1952 }
1953 Int_t *n_of_electrons = new Int_t [nrows]; // electron counter for each row
1954 TVector **tr = new TVector* [nrows]; //pointers to the track vectors
1955
1956 //--------------------------------------------------------------------
1957 // Loop over tracks, the "track" contains the full history
1958 //--------------------------------------------------------------------
1959
1960 Int_t previousTrack,currentTrack;
1961 previousTrack = -1; // nothing to store so far!
1962
1963 for(Int_t track=0;track<ntracks;track++){
1964
1965 ResetHits();
1966
1967 TH->GetEvent(track); // get next track
1968 Int_t nhits = fHits->GetEntriesFast(); // get number of hits for this track
1969
1970 if(nhits == 0) continue; // no hits in the TPC for this track
1971
1972 //--------------------------------------------------------------
1973 // Loop over hits
1974 //--------------------------------------------------------------
1975
1976 for(Int_t hit=0;hit<nhits;hit++){
1977
1978 tpcHit = (AliTPChit*)fHits->UncheckedAt(hit); // get a pointer to a hit
1979
1980 Int_t sector=tpcHit->fSector; // sector number
1981 if(sector != isec) continue; //terminate iteration
1982
1983 currentTrack = tpcHit->fTrack; // track number
1984 if(currentTrack != previousTrack){
1985
1986 // store already filled fTrack
1987
1988 for(i=0;i<nrows;i++){
1989 if(previousTrack != -1){
1990 if(n_of_electrons[i]>0){
1991 TVector &v = *tr[i];
1992 v(0) = previousTrack;
1993 tr[i]->ResizeTo(3*n_of_electrons[i]+1); // shrink if necessary
1994 row[i]->Add(tr[i]);
1995 }
1996 else{
1997 delete tr[i]; // delete empty TVector
1998 tr[i]=0;
1999 }
2000 }
2001
2002 n_of_electrons[i]=0;
2003 tr[i] = new TVector(361); // TVectors for the next fTrack
2004
2005 } // end of loop over rows
2006
2007 previousTrack=currentTrack; // update track label
2008 }
2009
2010 Int_t QI = (Int_t) (tpcHit->fQ); // energy loss (number of electrons)
2011
2012 //---------------------------------------------------
2013 // Calculate the electron attachment probability
2014 //---------------------------------------------------
2015
2016 Float_t time = 1.e6*(z_end-TMath::Abs(tpcHit->fZ))/fTPCParam->GetDriftV();
2017 // in microseconds!
2018 Float_t AttProb = fTPCParam->GetAttCoef()*
2019 fTPCParam->GetOxyCont()*time; // fraction!
2020
2021 //-----------------------------------------------
2022 // Loop over electrons
2023 //-----------------------------------------------
2024
2025 for(Int_t nel=0;nel<QI;nel++){
2026 // skip if electron lost due to the attachment
2027 if((gRandom->Rndm(0)) < AttProb) continue; // electron lost!
2028 xyz[0]=tpcHit->fX;
2029 xyz[1]=tpcHit->fY;
2030 xyz[2]=tpcHit->fZ;
2031 ElDiff(xyz); // Appply the diffusion
2032 Int_t row_number;
2033 fTPCParam->XYZtoCRXYZ(xyz,isec,row_number,3);
2034
2035 //transform position to local coordinates
2036 //option 3 means that we calculate x position relative to
2037 //nearest pad row
2038
2039 if ((row_number<0)||row_number>=fTPCParam->GetNRow(isec)) continue;
2040 ExB(xyz); // ExB effect at the sense wires
2041 n_of_electrons[row_number]++;
2042 //----------------------------------
2043 // Expand vector if necessary
2044 //----------------------------------
fe4da5cc 2045 if(n_of_electrons[row_number]>120){
2046 Int_t range = tr[row_number]->GetNrows();
8c555625 2047 if(n_of_electrons[row_number] > (range-1)/3){
2048 tr[row_number]->ResizeTo(range+150); // Add 50 electrons
fe4da5cc 2049 }
2050 }
2051
fe4da5cc 2052 TVector &v = *tr[row_number];
8c555625 2053 Int_t idx = 3*n_of_electrons[row_number]-2;
2054
2055 v(idx)= xyz[0]; // X
2056 v(idx+1)=xyz[1]; // Y (along the pad-row)
2057 v(idx+2)=xyz[2]; // Z
2058
2059 } // end of loop over electrons
2060
2061 } // end of loop over hits
2062 } // end of loop over tracks
2063
2064 //
2065 // store remaining track (the last one) if not empty
2066 //
2067
2068 for(i=0;i<nrows;i++){
2069 if(n_of_electrons[i]>0){
2070 TVector &v = *tr[i];
2071 v(0) = previousTrack;
2072 tr[i]->ResizeTo(3*n_of_electrons[i]+1); // shrink if necessary
2073 row[i]->Add(tr[i]);
fe4da5cc 2074 }
2075 else{
8c555625 2076 delete tr[i];
2077 tr[i]=0;
2078 }
2079 }
2080
2081 delete [] tr;
2082 delete [] n_of_electrons;
2083
2084} // end of MakeSector
2085//_____________________________________________________________________________
2086void AliTPC::GetCrossTalk (Int_t iFlag,TObjArray *p,Int_t ntracks,Int_t *npads,
2087 TMatrix *m)
2088{
2089
2090 //-------------------------------------------------------------
2091 // Calculates the cross-talk from one row (inner or outer)
2092 //-------------------------------------------------------------
2093
2094 //-----------------------------------------------------------------
2095 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
2096 //-----------------------------------------------------------------
2097
2098 //
2099 // iFlag=2 & 3 --> cross-talk from the inner row
2100 // iFlag=0 & 4 --> cross-talk from the outer row
2101 //
2102 AliTPCParam * fTPCParam = &(fDigParam->GetParam());
2103 AliTPCPRF2D * fPRF2D = &(fDigParam->GetPRF2D());
2104 AliTPCRF1D * fRF = &(fDigParam->GetRF());
3c0f9266 2105 const int MAXTBKT=
2106 int((z_end+6*fTPCParam->GetZSigma())/fTPCParam->GetZWidth())+1;
8c555625 2107
2108 //to make code faster
2109
2110 Float_t zwidth = fTPCParam->GetZWidth();
2111 Float_t zwidthm1 =1/fTPCParam->GetZWidth();
2112
2113 Int_t PadNumber;
2114 Float_t xwire;
2115
2116 Int_t nPadsSignal; // for this pads the signal is calculated
2117 Float_t range; // sense wire range
2118 Int_t nPadsDiff;
2119
2120 Float_t IneffFactor=0.5; // gain inefficiency close to the edges
2121
2122 if(iFlag == 0){
2123 // 1-->0
2124 nPadsSignal = npads[1];
2125 range = ((npads[1]-1)/2 + 0.5)*fTPCParam->GetPadPitchWidth();
2126 nPadsDiff = (npads[1]-npads[0])/2;
2127 }
2128 else if (iFlag == 2){
2129 // 1-->2
2130 nPadsSignal = npads[2];
2131 range = ((npads[1]-1)/2 + 0.5)*fTPCParam->GetPadPitchWidth();
2132 nPadsDiff = 0;
2133 }
2134 else if (iFlag == 3){
2135 // 0-->1
2136 nPadsSignal = npads[1];
2137 range = ((npads[0]-1)/2 + 0.5)*fTPCParam->GetPadPitchWidth();
2138 nPadsDiff = 0;
2139 }
2140 else{
2141 // 2-->1
2142 nPadsSignal = npads[2];
2143 range = ((npads[2]-1)/2 + 0.5)*fTPCParam->GetPadPitchWidth();
2144 nPadsDiff = (npads[2]-npads[1])/2;
2145 }
2146
2147 range-=0.5; // dead zone close to the edges
2148
2149 TVector *tv;
2150 TMatrix &signal = *m;
2151
1283eee5 2152 Int_t CentralPad = (nPadsSignal-1)/2;
8c555625 2153 Float_t PadSignal[7]; // signal from a single electron
2154 // Loop over tracks
2155 for(Int_t nt=0;nt<ntracks;nt++){
2156 tv=(TVector*)p->At(nt); // pointer to a track
2157 TVector &v = *tv;
2158 Int_t nElectrons = (tv->GetNrows()-1)/4;
2159 // Loop over electrons
2160 for(Int_t nel=0; nel<nElectrons; nel++){
2161 Int_t idx=nel*4;
2162 xwire=v(idx+1);
2163
2164 if (iFlag==0) xwire+=fTPCParam->GetPadPitchLength();
2165 if (iFlag==2) xwire-=fTPCParam->GetPadPitchLength();
2166 if (iFlag==3) xwire-=fTPCParam->GetPadPitchLength();
2167 if (iFlag==4) xwire+=fTPCParam->GetPadPitchLength();
2168
2169 // electron acceptance for the cross-talk (only the closest wire)
2170
2171 Float_t dxMax = fTPCParam->GetPadPitchLength()*0.5+fTPCParam->GetWWPitch();
2172 if(TMath::Abs(xwire)>dxMax) continue;
2173
2174 Float_t y = v(idx+2);
2175 Float_t z = v(idx+3);
2176 Float_t absy=TMath::Abs(y);
2177
2178 if(absy < 0.5*fTPCParam->GetPadPitchWidth()){
2179 PadNumber=CentralPad;
2180 }
2181 else if (absy < range){
8022212f 2182 PadNumber=(Int_t) ((absy-0.5*fTPCParam->GetPadPitchWidth())/fTPCParam->GetPadPitchWidth() +1.);
8c555625 2183 PadNumber=(Int_t) (TMath::Sign((Float_t)PadNumber, y)+CentralPad);
2184 }
2185 else continue; // electron out of sense wire range, lost at the sector edge
2186
2187 Float_t aval = (absy<range-0.5) ? v(idx+4):v(idx+4)*IneffFactor;
2188
2189 Float_t dist = y - (Float_t)(PadNumber-CentralPad)*fTPCParam->GetPadPitchWidth();
2190
a03540ae 2191 for (Int_t i=0;i<7;i++){
b6738b36 2192 PadSignal[i]=fPRF2D->GetPRF(-dist+(i-3)*fTPCParam->GetPadPitchWidth(),xwire)*aval;
8c555625 2193
a03540ae 2194 PadSignal[i] *= fTPCParam->GetPadCoupling();
2195 }
8c555625 2196 // real pad range
2197
1283eee5 2198 Int_t LeftPad = TMath::Max(0,PadNumber-3);
2199 Int_t RightPad = TMath::Min(nPadsSignal-1,PadNumber+3);
8c555625 2200
2201 Int_t pmin=LeftPad-PadNumber+3; // lower index of the pad_signal vector
2202 Int_t pmax=RightPad-PadNumber+3; // upper index
2203
2204
1283eee5 2205 Float_t z_drift = z*zwidthm1;
8c555625 2206 Float_t z_offset = z_drift-(Int_t)z_drift;
3c0f9266 2207
2208 Int_t FirstBucket = (Int_t)z_drift; // numbering starts from "0"
2209
8c555625 2210 for (Int_t i2=0;i2<4;i2++){
2211 Int_t TrueTime = FirstBucket+i2; // current time bucket
3c0f9266 2212 Float_t dz = (Float_t(i2)+1.- z_offset)*zwidth;
8c555625 2213 Float_t ampl = fRF->GetRF(dz);
3c0f9266 2214 if((TrueTime>MAXTBKT-1)) break; // beyond the time range
8c555625 2215
2216
2217 // loop over pads, from pmin to pmax
2218
2219 for(Int_t i3=pmin;i3<pmax+1;i3++){
2220 Int_t TruePad = LeftPad+i3-pmin;
2221
1283eee5 2222 if(TruePad<nPadsDiff || TruePad > nPadsSignal-nPadsDiff-1) continue;
8c555625 2223
2224 TruePad -= nPadsDiff;
2225 signal(TruePad,TrueTime)+=(PadSignal[i3]*ampl); // not converted to charge!
2226
2227 } // end of loop over pads
2228 } // end of loop over time bins
2229
2230 } // end of loop over electrons
2231
2232 } // end of loop over tracks
2233
2234} // end of GetCrossTalk
2235
2236
fe4da5cc 2237
2238//_____________________________________________________________________________
2239void AliTPC::Init()
2240{
2241 //
2242 // Initialise TPC detector after definition of geometry
2243 //
2244 Int_t i;
2245 //
2246 printf("\n");
2247 for(i=0;i<35;i++) printf("*");
2248 printf(" TPC_INIT ");
2249 for(i=0;i<35;i++) printf("*");
2250 printf("\n");
2251 //
2252 for(i=0;i<80;i++) printf("*");
2253 printf("\n");
2254}
2255
2256//_____________________________________________________________________________
2257void AliTPC::MakeBranch(Option_t* option)
2258{
2259 //
2260 // Create Tree branches for the TPC.
2261 //
2262 Int_t buffersize = 4000;
2263 char branchname[10];
2264 sprintf(branchname,"%s",GetName());
2265
2266 AliDetector::MakeBranch(option);
2267
2268 char *D = strstr(option,"D");
2269
2270 if (fDigits && gAlice->TreeD() && D) {
2271 gAlice->TreeD()->Branch(branchname,&fDigits, buffersize);
2272 printf("Making Branch %s for digits\n",branchname);
2273 }
2274
2275 char *R = strstr(option,"R");
2276
2277 if (fClusters && gAlice->TreeR() && R) {
2278 gAlice->TreeR()->Branch(branchname,&fClusters, buffersize);
2279 printf("Making Branch %s for Clusters\n",branchname);
2280 }
2281}
2282
2283//_____________________________________________________________________________
2284void AliTPC::ResetDigits()
2285{
2286 //
2287 // Reset number of digits and the digits array for this detector
2288 // reset clusters
2289 //
2290 fNdigits = 0;
8c555625 2291 // if (fDigits) fDigits->Clear();
2292 if (fDigParam->GetArray()!=0) fDigParam->GetArray()->Clear();
fe4da5cc 2293 fNclusters = 0;
2294 if (fClusters) fClusters->Clear();
2295}
2296
2297//_____________________________________________________________________________
2298void AliTPC::SetSecAL(Int_t sec)
2299{
8c555625 2300 //---------------------------------------------------
fe4da5cc 2301 // Activate/deactivate selection for lower sectors
8c555625 2302 //---------------------------------------------------
2303
2304 //-----------------------------------------------------------------
2305 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
2306 //-----------------------------------------------------------------
2307
fe4da5cc 2308 fSecAL = sec;
2309}
2310
2311//_____________________________________________________________________________
2312void AliTPC::SetSecAU(Int_t sec)
2313{
8c555625 2314 //----------------------------------------------------
fe4da5cc 2315 // Activate/deactivate selection for upper sectors
8c555625 2316 //---------------------------------------------------
2317
2318 //-----------------------------------------------------------------
2319 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
2320 //-----------------------------------------------------------------
2321
fe4da5cc 2322 fSecAU = sec;
2323}
2324
2325//_____________________________________________________________________________
2326void AliTPC::SetSecLows(Int_t s1,Int_t s2,Int_t s3,Int_t s4,Int_t s5, Int_t s6)
2327{
8c555625 2328 //----------------------------------------
fe4da5cc 2329 // Select active lower sectors
8c555625 2330 //----------------------------------------
2331
2332 //-----------------------------------------------------------------
2333 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
2334 //-----------------------------------------------------------------
2335
fe4da5cc 2336 fSecLows[0] = s1;
2337 fSecLows[1] = s2;
2338 fSecLows[2] = s3;
2339 fSecLows[3] = s4;
2340 fSecLows[4] = s5;
2341 fSecLows[5] = s6;
2342}
2343
2344//_____________________________________________________________________________
2345void AliTPC::SetSecUps(Int_t s1,Int_t s2,Int_t s3,Int_t s4,Int_t s5, Int_t s6,
2346 Int_t s7, Int_t s8 ,Int_t s9 ,Int_t s10,
2347 Int_t s11 , Int_t s12)
2348{
8c555625 2349 //--------------------------------
fe4da5cc 2350 // Select active upper sectors
8c555625 2351 //--------------------------------
2352
2353 //-----------------------------------------------------------------
2354 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
2355 //-----------------------------------------------------------------
2356
fe4da5cc 2357 fSecUps[0] = s1;
2358 fSecUps[1] = s2;
2359 fSecUps[2] = s3;
2360 fSecUps[3] = s4;
2361 fSecUps[4] = s5;
2362 fSecUps[5] = s6;
2363 fSecUps[6] = s7;
2364 fSecUps[7] = s8;
2365 fSecUps[8] = s9;
2366 fSecUps[9] = s10;
2367 fSecUps[10] = s11;
2368 fSecUps[11] = s12;
2369}
2370
2371//_____________________________________________________________________________
2372void AliTPC::SetSens(Int_t sens)
2373{
8c555625 2374
2375 //-------------------------------------------------------------
2376 // Activates/deactivates the sensitive strips at the center of
2377 // the pad row -- this is for the space-point resolution calculations
2378 //-------------------------------------------------------------
2379
2380 //-----------------------------------------------------------------
2381 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
2382 //-----------------------------------------------------------------
2383
fe4da5cc 2384 fSens = sens;
2385}
4b0fdcad 2386
2387void AliTPC::SetSide(Float_t side)
2388{
2389 fSide = side;
2390
2391}
1283eee5 2392//____________________________________________________________________________
2393void AliTPC::SetGasMixt(Int_t nc,Int_t c1,Int_t c2,Int_t c3,Float_t p1,
2394 Float_t p2,Float_t p3)
2395{
fe4da5cc 2396
1283eee5 2397 fNoComp = nc;
2398
2399 fMixtComp[0]=c1;
2400 fMixtComp[1]=c2;
2401 fMixtComp[2]=c3;
2402
2403 fMixtProp[0]=p1;
2404 fMixtProp[1]=p2;
2405 fMixtProp[2]=p3;
2406
2407
2408}
fe4da5cc 2409//_____________________________________________________________________________
2410void AliTPC::Streamer(TBuffer &R__b)
2411{
2412 //
2413 // Stream an object of class AliTPC.
2414 //
2415 if (R__b.IsReading()) {
2416 Version_t R__v = R__b.ReadVersion(); if (R__v) { }
2417 AliDetector::Streamer(R__b);
2418 if (R__v < 2) return;
2419 R__b >> fNsectors;
2420 R__b >> fNclusters;
2421 R__b >> fNtracks;
2422 fClustersIndex = new Int_t[fNsectors+1];
2423 fDigitsIndex = new Int_t[fNsectors+1];
2424 } else {
2425 R__b.WriteVersion(AliTPC::IsA());
2426 AliDetector::Streamer(R__b);
2427 R__b << fNsectors;
2428 R__b << fNclusters;
2429 R__b << fNtracks;
2430 }
2431}
2432
2433ClassImp(AliTPCcluster)
2434
2435//_____________________________________________________________________________
2436AliTPCcluster::AliTPCcluster(Float_t *hits, Int_t *lab)
2437{
2438 //
2439 // Creates a simulated cluster for the TPC
2440 //
2441 fTracks[0] = lab[0];
2442 fTracks[1] = lab[1];
2443 fTracks[2] = lab[2];
2444 fSector = lab[3];
2445 fPadRow = lab[4];
2446 fY = hits[0];
2447 fZ = hits[1];
2448 fQ = hits[2];
2449 fSigmaY2 = hits[3];
2450 fSigmaZ2 = hits[4];
2451}
2452
2453//_____________________________________________________________________________
8c555625 2454void AliTPCcluster::GetXYZ(Float_t *x, const AliTPCParam *par) const
fe4da5cc 2455{
2456 //
8c555625 2457 // Transformation from local to global coordinate system
fe4da5cc 2458 //
3c0f9266 2459 x[0]=par->GetPadRowRadii(fSector,fPadRow);
8c555625 2460 x[1]=fY;
2461 x[2]=fZ;
3c0f9266 2462 par->CRXYZtoXYZ(x,fSector,fPadRow,1);
2463 x[2]=fZ;
fe4da5cc 2464}
2465
8c555625 2466//_____________________________________________________________________________
2467Int_t AliTPCcluster::Compare(TObject * o)
2468{
2469 //
2470 // compare two clusters according y coordinata
3c0f9266 2471 //
8c555625 2472 AliTPCcluster *cl= (AliTPCcluster *)o;
2473 if (fY<cl->fY) return -1;
2474 if (fY==cl->fY) return 0;
2475 return 1;
2476}
2477
2478Bool_t AliTPCcluster::IsSortable() const
2479{
2480 //
2481 //make AliTPCcluster sortabale
3c0f9266 2482 //
8c555625 2483 return kTRUE;
2484}
2485
2486
2487
fe4da5cc 2488ClassImp(AliTPCdigit)
2489
2490//_____________________________________________________________________________
2491AliTPCdigit::AliTPCdigit(Int_t *tracks, Int_t *digits):
2492 AliDigit(tracks)
2493{
2494 //
2495 // Creates a TPC digit object
2496 //
2497 fSector = digits[0];
2498 fPadRow = digits[1];
2499 fPad = digits[2];
2500 fTime = digits[3];
2501 fSignal = digits[4];
2502}
2503
2504
2505ClassImp(AliTPChit)
2506
2507//_____________________________________________________________________________
2508AliTPChit::AliTPChit(Int_t shunt, Int_t track, Int_t *vol, Float_t *hits):
2509AliHit(shunt,track)
2510{
2511 //
2512 // Creates a TPC hit object
2513 //
2514 fSector = vol[0];
2515 fPadRow = vol[1];
2516 fX = hits[0];
2517 fY = hits[1];
2518 fZ = hits[2];
2519 fQ = hits[3];
2520}
2521
2522
2523ClassImp(AliTPCtrack)
2524
2525//_____________________________________________________________________________
2526AliTPCtrack::AliTPCtrack(Float_t *hits)
2527{
2528 //
2529 // Default creator for a TPC reconstructed track object
2530 //
3c0f9266 2531 fX=hits[0]; // This is dummy code !
fe4da5cc 2532}
2533
3c0f9266 2534AliTPCtrack::AliTPCtrack(const AliTPCcluster *c,const TVector& xx,
2535 const TMatrix& CC, Double_t xref, Double_t alpha):
2536 x(xx),C(CC),fClusters(200)
fe4da5cc 2537{
3c0f9266 2538 //-----------------------------------------------------------------
2539 // This is the main track constructor.
fe4da5cc 2540 //
3c0f9266 2541 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
2542 //-----------------------------------------------------------------
2543 fX=xref;
2544 fAlpha=alpha;
2545 fChi2=0.;
2546 fClusters.AddLast((AliTPCcluster*)(c));
fe4da5cc 2547}
2548
2549//_____________________________________________________________________________
2550AliTPCtrack::AliTPCtrack(const AliTPCtrack& t) : x(t.x), C(t.C),
3c0f9266 2551 fClusters(t.fClusters.GetEntriesFast())
fe4da5cc 2552{
3c0f9266 2553 //-----------------------------------------------------------------
2554 // This is a track copy constructor.
fe4da5cc 2555 //
3c0f9266 2556 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
2557 //-----------------------------------------------------------------
2558 fX=t.fX;
2559 fChi2=t.fChi2;
fe4da5cc 2560 fAlpha=t.fAlpha;
3c0f9266 2561 int n=t.fClusters.GetEntriesFast();
2562 for (int i=0; i<n; i++) fClusters.AddLast(t.fClusters.UncheckedAt(i));
fe4da5cc 2563}
2564
2565//_____________________________________________________________________________
3c0f9266 2566Int_t AliTPCtrack::Compare(TObject *o) {
2567 //-----------------------------------------------------------------
2568 // This function compares tracks according to their curvature.
fe4da5cc 2569 //
3c0f9266 2570 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
2571 //-----------------------------------------------------------------
2572 AliTPCtrack *t=(AliTPCtrack*)o;
2573 Double_t co=t->GetSigmaY2();
2574 Double_t c =GetSigmaY2();
2575 if (c>co) return 1;
2576 else if (c<co) return -1;
2577 return 0;
fe4da5cc 2578}
2579
2580//_____________________________________________________________________________
2581int AliTPCtrack::PropagateTo(Double_t xk,Double_t x0,Double_t rho,Double_t pm)
2582{
3c0f9266 2583 //-----------------------------------------------------------------
2584 // This function propagates a track to a reference plane x=xk.
fe4da5cc 2585 //
3c0f9266 2586 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
2587 //-----------------------------------------------------------------
fe4da5cc 2588 if (TMath::Abs(x(2)*xk - x(3)) >= 0.999) {
3c0f9266 2589 if (*this>4) cerr<<*this<<" AliTPCtrack warning: Propagation failed !\n";
fe4da5cc 2590 return 0;
2591 }
8c555625 2592
3c0f9266 2593 Double_t x1=fX, x2=x1+0.5*(xk-x1), dx=x2-x1, y1=x(0), z1=x(1);
fe4da5cc 2594 Double_t c1=x(2)*x1 - x(3), r1=sqrt(1.- c1*c1);
2595 Double_t c2=x(2)*x2 - x(3), r2=sqrt(1.- c2*c2);
2596
2597 x(0) += dx*(c1+c2)/(r1+r2);
2598 x(1) += dx*(c1+c2)/(c1*r2 + c2*r1)*x(4);
8c555625 2599
fe4da5cc 2600 TMatrix F(5,5); F.UnitMatrix();
2601 Double_t rr=r1+r2, cc=c1+c2, xx=x1+x2;
2602 F(0,2)= dx*(rr*xx + cc*(c1*x1/r1+c2*x2/r2))/(rr*rr);
2603 F(0,3)=-dx*(2*rr + cc*(c1/r1 + c2/r2))/(rr*rr);
2604 Double_t cr=c1*r2+c2*r1;
2605 F(1,2)= dx*x(4)*(cr*xx-cc*(r1*x2-c2*c1*x1/r1+r2*x1-c1*c2*x2/r2))/(cr*cr);
2606 F(1,3)=-dx*x(4)*(2*cr + cc*(c2*c1/r1-r1 + c1*c2/r2-r2))/(cr*cr);
2607 F(1,4)= dx*cc/cr;
2608 TMatrix tmp(F,TMatrix::kMult,C);
2609 C.Mult(tmp,TMatrix(TMatrix::kTransposed,F));
2610
3c0f9266 2611 fX=x2;
fe4da5cc 2612
2613 //Multiple scattering******************
3c0f9266 2614 Double_t ey=x(2)*fX - x(3);
fe4da5cc 2615 Double_t ex=sqrt(1-ey*ey);
2616 Double_t ez=x(4);
2617 TMatrix Q(5,5); Q=0.;
2618 Q(2,2)=ez*ez+ey*ey; Q(2,3)=-ex*ey; Q(2,4)=-ex*ez;
2619 Q(3,2)=Q(2,3); Q(3,3)= ez*ez+ex*ex; Q(3,4)=-ey*ez;
2620 Q(4,2)=Q(2,4); Q(4,3)= Q(3,4); Q(4,4)=1.;
2621
2622 F=0;
2623 F(2,2)=-x(2)*ex; F(2,3)=-x(2)*ey;
3c0f9266 2624 F(3,2)=-ex*(x(2)*fX-ey); F(3,3)=-(1.+ x(2)*fX*ey - ey*ey);
fe4da5cc 2625 F(4,2)=-ez*ex; F(4,3)=-ez*ey; F(4,4)=1.;
2626
2627 tmp.Mult(F,Q);
2628 Q.Mult(tmp,TMatrix(TMatrix::kTransposed,F));
2629
2630 Double_t p2=GetPt()*GetPt()*(1.+x(4)*x(4));
2631 Double_t beta2=p2/(p2 + pm*pm);
3c0f9266 2632 Double_t d=sqrt((x1-fX)*(x1-fX)+(y1-x(0))*(y1-x(0))+(z1-x(1))*(z1-x(1)));
fe4da5cc 2633 d*=2.;
2634 Double_t theta2=14.1*14.1/(beta2*p2*1e6)*d/x0*rho;
2635 Q*=theta2;
2636 C+=Q;
2637
2638 //Energy losses************************
2639 Double_t dE=0.153e-3/beta2*(log(5940*beta2/(1-beta2)) - beta2)*d*rho;
2640 if (x1 < x2) dE=-dE;
2641 x(2)*=(1.- sqrt(p2+pm*pm)/p2*dE);
8c555625 2642 //x(3)*=(1.- sqrt(p2+pm*pm)/p2*dE);
fe4da5cc 2643
3c0f9266 2644 x1=fX; x2=xk; y1=x(0); z1=x(1);
fe4da5cc 2645 c1=x(2)*x1 - x(3); r1=sqrt(1.- c1*c1);
2646 c2=x(2)*x2 - x(3); r2=sqrt(1.- c2*c2);
2647
2648 x(0) += dx*(c1+c2)/(r1+r2);
2649 x(1) += dx*(c1+c2)/(c1*r2 + c2*r1)*x(4);
2650
2651 F.UnitMatrix();
2652 rr=r1+r2; cc=c1+c2; xx=x1+x2;
2653 F(0,2)= dx*(rr*xx + cc*(c1*x1/r1+c2*x2/r2))/(rr*rr);
2654 F(0,3)=-dx*(2*rr + cc*(c1/r1 + c2/r2))/(rr*rr);
2655 cr=c1*r2+c2*r1;
2656 F(1,2)= dx*x(4)*(cr*xx-cc*(r1*x2-c2*c1*x1/r1+r2*x1-c1*c2*x2/r2))/(cr*cr);
2657 F(1,3)=-dx*x(4)*(2*cr + cc*(c2*c1/r1-r1 + c1*c2/r2-r2))/(cr*cr);
2658 F(1,4)= dx*cc/cr;
2659 tmp.Mult(F,C);
2660 C.Mult(tmp,TMatrix(TMatrix::kTransposed,F));
2661
3c0f9266 2662 fX=x2;
fe4da5cc 2663
2664 return 1;
2665}
2666
2667//_____________________________________________________________________________
2668void AliTPCtrack::PropagateToVertex(Double_t x0,Double_t rho,Double_t pm)
2669{
3c0f9266 2670 //-----------------------------------------------------------------
2671 // This function propagates tracks to the "vertex".
fe4da5cc 2672 //
3c0f9266 2673 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
2674 //-----------------------------------------------------------------
2675 Double_t c=x(2)*fX - x(3);
fe4da5cc 2676 Double_t tgf=-x(3)/(x(2)*x(0) + sqrt(1-c*c));
2677 Double_t snf=tgf/sqrt(1.+ tgf*tgf);
2678 Double_t xv=(x(3)+snf)/x(2);
2679 PropagateTo(xv,x0,rho,pm);
2680}
2681
2682//_____________________________________________________________________________
2683void AliTPCtrack::Update(const AliTPCcluster *c, Double_t chisq)
2684{
3c0f9266 2685 //-----------------------------------------------------------------
2686 // This function associates a clusters with this track.
fe4da5cc 2687 //
3c0f9266 2688 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
2689 //-----------------------------------------------------------------
fe4da5cc 2690 TMatrix H(2,5); H.UnitMatrix();
2691 TMatrix Ht(TMatrix::kTransposed,H);
2692 TVector m(2); m(0)=c->fY; m(1)=c->fZ;
2693 TMatrix V(2,2); V(0,0)=c->fSigmaY2; V(0,1)=0.; V(1,0)=0.; V(1,1)=c->fSigmaZ2;
2694
2695 TMatrix tmp(H,TMatrix::kMult,C);
2696 TMatrix R(tmp,TMatrix::kMult,Ht); R+=V;
2697
2698 Double_t det=(Double_t)R(0,0)*R(1,1) - (Double_t)R(0,1)*R(1,0);
2699 R(0,1)=R(0,0); R(0,0)=R(1,1); R(1,1)=R(0,1);
2700 R(1,0)*=-1; R(0,1)=R(1,0);
2701 R*=1./det;
2702
2703 //R.Invert();
2704
2705 TMatrix K(C,TMatrix::kMult,Ht); K*=R;
2706
2707 TVector savex=x;
2708 x*=H; x-=m; x*=-1; x*=K; x+=savex;
3c0f9266 2709 if (TMath::Abs(x(2)*fX-x(3)) >= 0.999) {
2710 if (*this>4) cerr<<*this<<" AliTPCtrack warning: Filtering failed !\n";
fe4da5cc 2711 x=savex;
2712 return;
2713 }
2714
2715 TMatrix saveC=C;
2716 C.Mult(K,tmp); C-=saveC; C*=-1;
2717
3c0f9266 2718 fClusters.AddLast((AliTPCcluster*)c);
2719 fChi2 += chisq;
fe4da5cc 2720}
2721
2722//_____________________________________________________________________________
2723int AliTPCtrack::Rotate(Double_t alpha)
2724{
3c0f9266 2725 //-----------------------------------------------------------------
2726 // This function rotates this track.
fe4da5cc 2727 //
3c0f9266 2728 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
2729 //-----------------------------------------------------------------
fe4da5cc 2730 fAlpha += alpha;
2731
3c0f9266 2732 Double_t x1=fX, y1=x(0);
fe4da5cc 2733 Double_t ca=cos(alpha), sa=sin(alpha);
3c0f9266 2734 Double_t r1=x(2)*fX - x(3);
fe4da5cc 2735
3c0f9266 2736 fX = x1*ca + y1*sa;
fe4da5cc 2737 x(0)=-x1*sa + y1*ca;
2738 x(3)=x(3)*ca + (x(2)*y1 + sqrt(1.- r1*r1))*sa;
2739
3c0f9266 2740 Double_t r2=x(2)*fX - x(3);
fe4da5cc 2741 if (TMath::Abs(r2) >= 0.999) {
3c0f9266 2742 if (*this>4) cerr<<*this<<" AliTPCtrack warning: Rotation failed !\n";
fe4da5cc 2743 return 0;
2744 }
2745
2746 Double_t y0=x(0) + sqrt(1.- r2*r2)/x(2);
2747 if ((x(0)-y0)*x(2) >= 0.) {
3c0f9266 2748 if (*this>4) cerr<<*this<<" AliTPCtrack warning: Rotation failed !!!\n";
fe4da5cc 2749 return 0;
2750 }
2751
2752 TMatrix F(5,5); F.UnitMatrix();
2753 F(0,0)=ca;
2754 F(3,0)=x(2)*sa;
2755 F(3,2)=(y1 - r1*x1/sqrt(1.- r1*r1))*sa;
2756 F(3,3)= ca + sa*r1/sqrt(1.- r1*r1);
2757 TMatrix tmp(F,TMatrix::kMult,C);
2758 // Double_t dy2=C(0,0);
2759 C.Mult(tmp,TMatrix(TMatrix::kTransposed,F));
2760 // C(0,0)+=dy2*sa*sa*r1*r1/(1.- r1*r1);
2761 // C(1,1)+=dy2*sa*sa*x(4)*x(4)/(1.- r1*r1);
2762
2763 return 1;
2764}
2765
2766//_____________________________________________________________________________
2767void AliTPCtrack::UseClusters() const
2768{
3c0f9266 2769 //-----------------------------------------------------------------
2770 // This function marks clusters associated with this track.
fe4da5cc 2771 //
3c0f9266 2772 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
2773 //-----------------------------------------------------------------
2774 int num_of_clusters=fClusters.GetEntriesFast();
fe4da5cc 2775 for (int i=0; i<num_of_clusters; i++) {
2776 //if (i<=14) continue;
3c0f9266 2777 AliTPCcluster *c=(AliTPCcluster*)fClusters.UncheckedAt(i);
fe4da5cc 2778 c->Use();
2779 }
2780}
2781
2782//_____________________________________________________________________________
2783Double_t AliTPCtrack::GetPredictedChi2(const AliTPCcluster *c) const
2784{
3c0f9266 2785 //-----------------------------------------------------------------
2786 // This function calculates a predicted chi2 increment.
fe4da5cc 2787 //
3c0f9266 2788 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
2789 //-----------------------------------------------------------------
fe4da5cc 2790 TMatrix H(2,5); H.UnitMatrix();
2791 TVector m(2); m(0)=c->fY; m(1)=c->fZ;
2792 TMatrix V(2,2); V(0,0)=c->fSigmaY2; V(0,1)=0.; V(1,0)=0.; V(1,1)=c->fSigmaZ2;
2793 TVector res=x; res*=H; res-=m; //res*=-1;
2794 TMatrix tmp(H,TMatrix::kMult,C);
2795 TMatrix R(tmp,TMatrix::kMult,TMatrix(TMatrix::kTransposed,H)); R+=V;
2796
2797 Double_t det=(Double_t)R(0,0)*R(1,1) - (Double_t)R(0,1)*R(1,0);
2798 if (TMath::Abs(det) < 1.e-10) {
3c0f9266 2799 if (*this>4) cerr<<*this<<" AliTPCtrack warning: Singular matrix !\n";
fe4da5cc 2800 return 1e10;
2801 }
2802 R(0,1)=R(0,0); R(0,0)=R(1,1); R(1,1)=R(0,1);
2803 R(1,0)*=-1; R(0,1)=R(1,0);
2804 R*=1./det;
2805
2806 //R.Invert();
2807
2808 TVector r=res;
2809 res*=R;
2810 return r*res;
2811}
2812
2813//_____________________________________________________________________________
3c0f9266 2814struct S { int lab; int max; };
2815int AliTPCtrack::GetLabel(int nrows) const
fe4da5cc 2816{
3c0f9266 2817 //-----------------------------------------------------------------
2818 // This function returns the track label. If label<0, this track is fake.
fe4da5cc 2819 //
3c0f9266 2820 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
2821 //-----------------------------------------------------------------
2822 int num_of_clusters=fClusters.GetEntriesFast();
2823 S *s=new S[num_of_clusters];
fe4da5cc 2824 int i;
3c0f9266 2825 for (i=0; i<num_of_clusters; i++) s[i].lab=s[i].max=0;
2826
2827 int lab=123456789;
fe4da5cc 2828 for (i=0; i<num_of_clusters; i++) {
3c0f9266 2829 AliTPCcluster *c=(AliTPCcluster*)fClusters.UncheckedAt(i);
8c555625 2830 lab=TMath::Abs(c->fTracks[0]);
fe4da5cc 2831 int j;
3c0f9266 2832 for (j=0; j<num_of_clusters; j++)
fe4da5cc 2833 if (s[j].lab==lab || s[j].max==0) break;
2834 s[j].lab=lab;
2835 s[j].max++;
2836 }
2837
2838 int max=0;
2839 for (i=0; i<num_of_clusters; i++)
2840 if (s[i].max>max) {max=s[i].max; lab=s[i].lab;}
3c0f9266 2841
2842 delete[] s;
2843
8c555625 2844 for (i=0; i<num_of_clusters; i++) {
3c0f9266 2845 AliTPCcluster *c=(AliTPCcluster*)fClusters.UncheckedAt(i);
8c555625 2846 if (TMath::Abs(c->fTracks[1]) == lab ||
2847 TMath::Abs(c->fTracks[2]) == lab ) max++;
2848 }
fe4da5cc 2849
2850 if (1.-float(max)/num_of_clusters > 0.10) return -lab;
2851
3c0f9266 2852 int tail=int(0.08*nrows);
2853 if (num_of_clusters < tail) return lab;
fe4da5cc 2854
2855 max=0;
3c0f9266 2856 for (i=1; i<=tail; i++) {
2857 AliTPCcluster *c=(AliTPCcluster*)fClusters.UncheckedAt(num_of_clusters-i);
8c555625 2858 if (lab == TMath::Abs(c->fTracks[0]) ||
2859 lab == TMath::Abs(c->fTracks[1]) ||
2860 lab == TMath::Abs(c->fTracks[2])) max++;
fe4da5cc 2861 }
3c0f9266 2862 if (max < int(0.5*tail)) return -lab;
fe4da5cc 2863
2864 return lab;
2865}
2866
2867//_____________________________________________________________________________
2868void AliTPCtrack::GetPxPyPz(Double_t& px, Double_t& py, Double_t& pz) const
2869{
3c0f9266 2870 //-----------------------------------------------------------------
2871 // This function returns reconstructed track momentum in the global system.
fe4da5cc 2872 //
3c0f9266 2873 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
2874 //-----------------------------------------------------------------
2875 Double_t pt=TMath::Abs(GetPt()); // GeV/c
2876 Double_t r=x(2)*fX-x(3);
fe4da5cc 2877 Double_t y0=x(0) + sqrt(1.- r*r)/x(2);
2878 px=-pt*(x(0)-y0)*x(2); //cos(phi);
3c0f9266 2879 py=-pt*(x(3)-fX*x(2)); //sin(phi);
fe4da5cc 2880 pz=pt*x(4);
2881 Double_t tmp=px*TMath::Cos(fAlpha) - py*TMath::Sin(fAlpha);
2882 py=px*TMath::Sin(fAlpha) + py*TMath::Cos(fAlpha);
2883 px=tmp;
2884}
2885
2886//_____________________________________________________________________________
3c0f9266 2887Double_t AliTPCtrack::GetdEdX(Double_t low, Double_t up) const {
2888 //-----------------------------------------------------------------
2889 // This funtion calculates dE/dX within the "low" and "up" cuts.
fe4da5cc 2890 //
3c0f9266 2891 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
2892 //-----------------------------------------------------------------
2893 int ncl=fClusters.GetEntriesFast();
2894 int n=0;
2895 Double_t *q=new Double_t[ncl];
2896 int i;
2897 for (i=0; i<ncl; i++) {
2898 AliTPCcluster *cl=(AliTPCcluster*)(fClusters.UncheckedAt(i));
2899 // if (cl->fdEdX > 3000) continue;
2900 if (cl->fdEdX <= 0) continue;
2901 q[n++]=cl->fdEdX;
2902 }
2903
2904 //stupid sorting
2905 int swap;
2906 do {
2907 swap=0;
2908 for (i=0; i<n-1; i++) {
2909 if (q[i]<=q[i+1]) continue;
2910 Double_t tmp=q[i]; q[i]=q[i+1]; q[i+1]=tmp;
2911 swap++;
2912 }
2913 } while (swap);
2914
2915 int nl=int(low*n), nu=int(up *n);
2916 Double_t dedx=0.;
2917 for (i=nl; i<=nu; i++) dedx += q[i];
2918 dedx /= (nu-nl+1);
2919 return dedx;
2920}
2921
2922//_________________________________________________________________________
2923//
2924// Classes for internal tracking use
2925//_________________________________________________________________________
2926void AliTPCRow::InsertCluster(const AliTPCcluster* c) {
2927 //-----------------------------------------------------------------------
2928 // Insert a cluster into this pad row in accordence with its y-coordinate
2929 //
2930 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
2931 //-----------------------------------------------------------------------
fe4da5cc 2932 if (num_of_clusters==MAX_CLUSTER_PER_ROW) {
2933 cerr<<"AliTPCRow::InsertCluster(): Too many clusters !\n"; return;
2934 }
2935 if (num_of_clusters==0) {clusters[num_of_clusters++]=c; return;}
2936 int i=Find(c->fY);
2937 memmove(clusters+i+1 ,clusters+i,(num_of_clusters-i)*sizeof(AliTPCcluster*));
2938 clusters[i]=c; num_of_clusters++;
2939}
2940
3c0f9266 2941int AliTPCRow::Find(Double_t y) const {
2942 //-----------------------------------------------------------------------
2943 // Return the index of the nearest cluster
fe4da5cc 2944 //
3c0f9266 2945 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
2946 //-----------------------------------------------------------------------
fe4da5cc 2947 if (y <= clusters[0]->fY) return 0;
2948 if (y > clusters[num_of_clusters-1]->fY) return num_of_clusters;
2949 int b=0, e=num_of_clusters-1, m=(b+e)/2;
2950 for (; b<e; m=(b+e)/2) {
2951 if (y > clusters[m]->fY) b=m+1;
2952 else e=m;
2953 }
2954 return m;
2955}
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