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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;
8c555625 56 //MI changes
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();
fe4da5cc 76 //
77 // Initialise counters
78 fClusters = 0;
79 fTracks = 0;
80 fNsectors = 72;
81 fNtracks = 0;
82 fNclusters= 0;
83 fDigitsIndex = new Int_t[fNsectors+1];
84 fClustersIndex = new Int_t[fNsectors+1];
85 //
86 fIshunt = 0;
87 //
88 // Initialise color attributes
89 SetMarkerColor(kYellow);
90}
91
92//_____________________________________________________________________________
93AliTPC::~AliTPC()
94{
95 //
96 // TPC destructor
97 //
98 fIshunt = 0;
99 delete fHits;
100 delete fDigits;
101 delete fClusters;
102 delete fTracks;
8c555625 103 delete fDigParam;
fe4da5cc 104 if (fDigitsIndex) delete [] fDigitsIndex;
105 if (fClustersIndex) delete [] fClustersIndex;
106}
107
108//_____________________________________________________________________________
109void AliTPC::AddCluster(Float_t *hits, Int_t *tracks)
110{
111 //
112 // Add a simulated cluster to the list
113 //
114 if(!fClusters) fClusters=new TClonesArray("AliTPCcluster",10000);
115 TClonesArray &lclusters = *fClusters;
116 new(lclusters[fNclusters++]) AliTPCcluster(hits,tracks);
117}
118
119//_____________________________________________________________________________
120void AliTPC::AddCluster(const AliTPCcluster &c)
121{
122 //
123 // Add a simulated cluster copy to the list
124 //
125 if(!fClusters) fClusters=new TClonesArray("AliTPCcluster",10000);
126 TClonesArray &lclusters = *fClusters;
127 new(lclusters[fNclusters++]) AliTPCcluster(c);
128}
129
130//_____________________________________________________________________________
131void AliTPC::AddDigit(Int_t *tracks, Int_t *digits)
132{
133 //
134 // Add a TPC digit to the list
135 //
8c555625 136 // TClonesArray &ldigits = *fDigits;
137 //MI change
138 TClonesArray &ldigits = *fDigParam->GetArray();
fe4da5cc 139 new(ldigits[fNdigits++]) AliTPCdigit(tracks,digits);
140}
141
142//_____________________________________________________________________________
143void AliTPC::AddHit(Int_t track, Int_t *vol, Float_t *hits)
144{
145 //
146 // Add a hit to the list
147 //
148 TClonesArray &lhits = *fHits;
149 new(lhits[fNhits++]) AliTPChit(fIshunt,track,vol,hits);
150}
151
152//_____________________________________________________________________________
153void AliTPC::AddTrack(Float_t *hits)
154{
155 //
156 // Add a track to the list of tracks
157 //
158 TClonesArray &ltracks = *fTracks;
159 new(ltracks[fNtracks++]) AliTPCtrack(hits);
160}
161
162//_____________________________________________________________________________
163void AliTPC::AddTrack(const AliTPCtrack& t)
164{
165 //
166 // Add a track copy to the list of tracks
167 //
168 if(!fTracks) fTracks=new TClonesArray("AliTPCtrack",10000);
169 TClonesArray &ltracks = *fTracks;
170 new(ltracks[fNtracks++]) AliTPCtrack(t);
171}
172
173//_____________________________________________________________________________
174void AliTPC::BuildGeometry()
175{
176 //
177 // Build TPC ROOT TNode geometry for the event display
178 //
179 TNode *Node, *Top;
180 TTUBS *tubs;
181 Int_t i;
182 const int kColorTPC=19;
1283eee5 183 char name[5], title[25];
fe4da5cc 184 const Double_t kDegrad=TMath::Pi()/180;
1283eee5 185 const Double_t kRaddeg=180./TMath::Pi();
186
187 AliTPCParam * fTPCParam = &(fDigParam->GetParam());
188
189 Float_t InnerOpenAngle = fTPCParam->GetInnerAngle();
190 Float_t OuterOpenAngle = fTPCParam->GetOuterAngle();
191
192 Float_t InnerAngleShift = fTPCParam->GetInnerAngleShift();
193 Float_t OuterAngleShift = fTPCParam->GetOuterAngleShift();
194
195 Int_t nLo = fTPCParam->GetNInnerSector()/2;
196 Int_t nHi = fTPCParam->GetNOuterSector()/2;
197
198 const Double_t loAng = (Double_t)TMath::Nint(InnerOpenAngle*kRaddeg);
199 const Double_t hiAng = (Double_t)TMath::Nint(OuterOpenAngle*kRaddeg);
200 const Double_t loAngSh = (Double_t)TMath::Nint(InnerAngleShift*kRaddeg);
201 const Double_t hiAngSh = (Double_t)TMath::Nint(OuterAngleShift*kRaddeg);
202
203
fe4da5cc 204 const Double_t loCorr = 1/TMath::Cos(0.5*loAng*kDegrad);
205 const Double_t hiCorr = 1/TMath::Cos(0.5*hiAng*kDegrad);
1283eee5 206
207 Double_t rl,ru;
208
209
fe4da5cc 210 //
211 // Get ALICE top node
fe4da5cc 212 //
1283eee5 213
214 Top=gAlice->GetGeometry()->GetNode("alice");
215
216 // inner sectors
217
218 rl = fTPCParam->GetInSecLowEdge();
219 ru = fTPCParam->GetInSecUpEdge();
220
221
fe4da5cc 222 for(i=0;i<nLo;i++) {
223 sprintf(name,"LS%2.2d",i);
1283eee5 224 name[4]='\0';
225 sprintf(title,"TPC low sector %3d",i);
226 title[24]='\0';
227
228 tubs = new TTUBS(name,title,"void",rl*loCorr,ru*loCorr,250.,
229 loAng*(i-0.5)+loAngSh,loAng*(i+0.5)+loAngSh);
fe4da5cc 230 tubs->SetNumberOfDivisions(1);
231 Top->cd();
232 Node = new TNode(name,title,name,0,0,0,"");
233 Node->SetLineColor(kColorTPC);
234 fNodes->Add(Node);
235 }
1283eee5 236
fe4da5cc 237 // Outer sectors
1283eee5 238
239 rl = fTPCParam->GetOuSecLowEdge();
240 ru = fTPCParam->GetOuSecUpEdge();
241
fe4da5cc 242 for(i=0;i<nHi;i++) {
243 sprintf(name,"US%2.2d",i);
1283eee5 244 name[4]='\0';
fe4da5cc 245 sprintf(title,"TPC upper sector %d",i);
1283eee5 246 title[24]='\0';
247 tubs = new TTUBS(name,title,"void",rl*hiCorr,ru*hiCorr,250,
248 hiAng*(i-0.5)+hiAngSh,hiAng*(i+0.5)+hiAngSh);
fe4da5cc 249 tubs->SetNumberOfDivisions(1);
250 Top->cd();
251 Node = new TNode(name,title,name,0,0,0,"");
252 Node->SetLineColor(kColorTPC);
253 fNodes->Add(Node);
254 }
1283eee5 255}
256
257
258
fe4da5cc 259//_____________________________________________________________________________
260Int_t AliTPC::DistancetoPrimitive(Int_t , Int_t )
261{
262 //
263 // Calculate distance from TPC to mouse on the display
264 // Dummy procedure
265 //
266 return 9999;
267}
268
269//_____________________________________________________________________________
8c555625 270//const int MAX_CLUSTER=nrow_low+nrow_up;
271const int MAX_CLUSTER=200;
fe4da5cc 272const int S_MAXSEC=24;
273const int L_MAXSEC=48;
274const int ROWS_TO_SKIP=21;
8c555625 275const Float_t MAX_CHI2=12.;
276
fe4da5cc 277
278//_____________________________________________________________________________
279static Double_t SigmaY2(Double_t r, Double_t tgl, Double_t pt)
280{
281 //
282 // Calculate spread in Y
283 //
284 pt=TMath::Abs(pt)*1000.;
285 Double_t x=r/pt;
286 tgl=TMath::Abs(tgl);
287 Double_t s=a_rphi - b_rphi*r*tgl + c_rphi*x*x + d_rphi*x;
288 if (s<0.4e-3) s=0.4e-3;
289 return s;
290}
291
292//_____________________________________________________________________________
293static Double_t SigmaZ2(Double_t r, Double_t tgl)
294{
295 //
296 // Calculate spread in Z
297 //
298 tgl=TMath::Abs(tgl);
299 Double_t s=a_z - b_z*r*tgl + c_z*tgl*tgl;
300 if (s<0.4e-3) s=0.4e-3;
301 return s;
302}
303
304//_____________________________________________________________________________
305inline Double_t f1(Double_t x1,Double_t y1, //C
306 Double_t x2,Double_t y2,
307 Double_t x3,Double_t y3)
308{
309 //
310 // Function f1
311 //
312 Double_t d=(x2-x1)*(y3-y2)-(x3-x2)*(y2-y1);
313 Double_t a=0.5*((y3-y2)*(y2*y2-y1*y1+x2*x2-x1*x1)-
314 (y2-y1)*(y3*y3-y2*y2+x3*x3-x2*x2));
315 Double_t b=0.5*((x2-x1)*(y3*y3-y2*y2+x3*x3-x2*x2)-
316 (x3-x2)*(y2*y2-y1*y1+x2*x2-x1*x1));
8c555625 317
fe4da5cc 318 Double_t xr=TMath::Abs(d/(d*x1-a)), yr=d/(d*y1-b);
8c555625 319
fe4da5cc 320 return -xr*yr/sqrt(xr*xr+yr*yr);
321}
322
323
324//_____________________________________________________________________________
325inline Double_t f2(Double_t x1,Double_t y1, //eta=C*x0
326 Double_t x2,Double_t y2,
327 Double_t x3,Double_t y3)
328{
329 //
330 // Function f2
331 //
332 Double_t d=(x2-x1)*(y3-y2)-(x3-x2)*(y2-y1);
333 Double_t a=0.5*((y3-y2)*(y2*y2-y1*y1+x2*x2-x1*x1)-
334 (y2-y1)*(y3*y3-y2*y2+x3*x3-x2*x2));
335 Double_t b=0.5*((x2-x1)*(y3*y3-y2*y2+x3*x3-x2*x2)-
336 (x3-x2)*(y2*y2-y1*y1+x2*x2-x1*x1));
8c555625 337
fe4da5cc 338 Double_t xr=TMath::Abs(d/(d*x1-a)), yr=d/(d*y1-b);
339
340 return -a/(d*y1-b)*xr/sqrt(xr*xr+yr*yr);
341}
342
343//_____________________________________________________________________________
344inline Double_t f3(Double_t x1,Double_t y1, //tgl
345 Double_t x2,Double_t y2,
346 Double_t z1,Double_t z2)
347{
348 //
349 // Function f3
350 //
351 return (z1 - z2)/sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
352}
353
354//_____________________________________________________________________________
355static int FindProlongation(AliTPCtrack& t, const AliTPCSector *sec,
356 int s, int ri, int rf=0)
357{
358 //
359 // Propagate track
360 //
361 int try_again=ROWS_TO_SKIP;
362 Double_t alpha=sec->GetAlpha();
363 int ns=int(2*TMath::Pi()/alpha)+1;
8c555625 364
fe4da5cc 365 for (int nr=ri; nr>=rf; nr--) {
366 Double_t x=sec[s].GetX(nr), ymax=sec[s].GetMaxY(nr);
8c555625 367 if (!t.PropagateTo(x)) return -1;
368
fe4da5cc 369 const AliTPCcluster *cl=0;
370 Double_t max_chi2=MAX_CHI2;
371 const AliTPCRow& row=sec[s][nr];
372 Double_t sy2=SigmaY2(t.GetX(),t.GetTgl(),t.GetPt());
373 Double_t sz2=SigmaZ2(t.GetX(),t.GetTgl());
8c555625 374 Double_t road=3.*sqrt(t.GetSigmaY2() + 4*sy2), y=t.GetY(), z=t.GetZ();
375
fe4da5cc 376 if (road>30) {
377 if (t>3) cerr<<t<<" AliTPCtrack warning: Too broad road !\n";
8c555625 378 return -1;
fe4da5cc 379 }
8c555625 380
381 if (row) {
fe4da5cc 382 for (int i=row.Find(y-road); i<row; i++) {
383 AliTPCcluster* c=(AliTPCcluster*)(row[i]);
384 if (c->fY > y+road) break;
385 if (c->IsUsed()) continue;
8c555625 386 if ((c->fZ - z)*(c->fZ - z) > 9.*(t.GetSigmaZ2() + 4*sz2)) continue;
fe4da5cc 387 Double_t chi2=t.GetPredictedChi2(c);
388 if (chi2 > max_chi2) continue;
389 max_chi2=chi2;
390 cl=c;
391 }
8c555625 392 }
fe4da5cc 393 if (cl) {
394 t.Update(cl,max_chi2);
395 try_again=ROWS_TO_SKIP;
396 } else {
8c555625 397 if (try_again==0) break;
398 if (y > ymax) {
399 s = (s+1) % ns;
400 if (!t.Rotate(alpha)) return -1;
401 } else if (y <-ymax) {
402 s = (s-1+ns) % ns;
403 if (!t.Rotate(-alpha)) return -1;
fe4da5cc 404 }
8c555625 405 try_again--;
fe4da5cc 406 }
407 }
8c555625 408
fe4da5cc 409 return s;
410}
411
8c555625 412
fe4da5cc 413//_____________________________________________________________________________
8c555625 414static void MakeSeeds(TObjArray& seeds,const AliTPCSector* sec,int i1,int i2,
415const AliTPCParam *p)
fe4da5cc 416{
417 //
418 // Find seed for tracking
419 //
420 TMatrix C(5,5); TVector x(5);
421 int max_sec=L_MAXSEC/2;
422 for (int ns=0; ns<max_sec; ns++) {
423 int nl=sec[(ns-1+max_sec)%max_sec][i2];
424 int nm=sec[ns][i2];
425 int nu=sec[(ns+1)%max_sec][i2];
426 Double_t alpha=sec[ns].GetAlpha();
427 const AliTPCRow& r1=sec[ns][i1];
428 for (int is=0; is < r1; is++) {
429 Double_t x1=sec[ns].GetX(i1), y1=r1[is]->fY, z1=r1[is]->fZ;
430 for (int js=0; js < nl+nm+nu; js++) {
431 const AliTPCcluster *cl;
432 Double_t cs,sn;
8c555625 433 int ks;
fe4da5cc 434
435 if (js<nl) {
8c555625 436 ks=(ns-1+max_sec)%max_sec;
fe4da5cc 437 const AliTPCRow& r2=sec[(ns-1+max_sec)%max_sec][i2];
438 cl=r2[js];
439 cs=cos(alpha); sn=sin(alpha);
440 } else
441 if (js<nl+nm) {
8c555625 442 ks=ns;
fe4da5cc 443 const AliTPCRow& r2=sec[ns][i2];
444 cl=r2[js-nl];
445 cs=1; sn=0.;
446 } else {
8c555625 447 ks=(ns+1)%max_sec;
fe4da5cc 448 const AliTPCRow& r2=sec[(ns+1)%max_sec][i2];
449 cl=r2[js-nl-nm];
450 cs=cos(alpha); sn=-sin(alpha);
451 }
452 Double_t x2=sec[ns].GetX(i2), y2=cl->fY, z2=cl->fZ;
453 //if (z1*z2 < 0) continue;
454 //if (TMath::Abs(z1) < TMath::Abs(z2)) continue;
455
456 Double_t tmp= x2*cs+y2*sn;
457 y2 =-x2*sn+y2*cs;
458 x2=tmp;
459
460 x(0)=y1;
461 x(1)=z1;
462 x(2)=f1(x1,y1,x2,y2,0.,0.);
463 x(3)=f2(x1,y1,x2,y2,0.,0.);
464 x(4)=f3(x1,y1,x2,y2,z1,z2);
465
466 if (TMath::Abs(x(2)*x1-x(3)) >= 0.999) continue;
467
468 if (TMath::Abs(x(4)) > 1.2) continue;
8c555625 469
fe4da5cc 470 Double_t a=asin(x(3));
fe4da5cc 471 Double_t zv=z1 - x(4)/x(2)*(a+asin(x(2)*x1-x(3)));
472 if (TMath::Abs(zv)>33.) continue;
8c555625 473
fe4da5cc 474 TMatrix X(6,6); X=0.;
475 X(0,0)=r1[is]->fSigmaY2; X(1,1)=r1[is]->fSigmaZ2;
476 X(2,2)=cl->fSigmaY2; X(3,3)=cl->fSigmaZ2;
477 X(4,4)=3./12.; X(5,5)=3./12.;
478 TMatrix F(5,6); F.UnitMatrix();
479 Double_t sy=sqrt(X(0,0)), sz=sqrt(X(1,1));
480 F(2,0)=(f1(x1,y1+sy,x2,y2,0.,0.)-x(2))/sy;
481 F(2,2)=(f1(x1,y1,x2,y2+sy,0.,0.)-x(2))/sy;
482 F(2,4)=(f1(x1,y1,x2,y2,0.,0.+sy)-x(2))/sy;
483 F(3,0)=(f2(x1,y1+sy,x2,y2,0.,0.)-x(3))/sy;
484 F(3,2)=(f2(x1,y1,x2,y2+sy,0.,0.)-x(3))/sy;
485 F(3,4)=(f2(x1,y1,x2,y2,0.,0.+sy)-x(3))/sy;
486 F(4,0)=(f3(x1,y1+sy,x2,y2,z1,z2)-x(4))/sy;
487 F(4,1)=(f3(x1,y1,x2,y2,z1+sz,z2)-x(4))/sz;
488 F(4,2)=(f3(x1,y1,x2,y2+sy,z1,z2)-x(4))/sy;
489 F(4,3)=(f3(x1,y1,x2,y2,z1,z2+sz)-x(4))/sz;
490 F(4,4)=0;
491 F(3,3)=0;
492
493 TMatrix t(F,TMatrix::kMult,X);
494 C.Mult(t,TMatrix(TMatrix::kTransposed,F));
8c555625 495
496 TrackSeed *track=new TrackSeed(*(r1[is]),x,C,p);
497 int rc=FindProlongation(*track,sec,ns,i1-1,i2);
498 if (rc<0 || *track<(i1-i2)/2) delete track;
499 else seeds.AddLast(track);
fe4da5cc 500 }
501 }
502 }
503}
504
505//_____________________________________________________________________________
506void AliTPC::Clusters2Tracks()
507{
508 //
509 // TPC Track finder from clusters.
510 //
511 if (!fClusters) return;
8c555625 512
513 AliTPCParam *p=&fDigParam->GetParam();
514 Int_t nrow_low=p->GetNRowLow();
515 Int_t nrow_up=p->GetNRowUp();
516
fe4da5cc 517 AliTPCSSector ssec[S_MAXSEC/2];
8c555625 518 for (int i=0; i<S_MAXSEC/2; i++) ssec[i].SetUp(p);
519
fe4da5cc 520 AliTPCLSector lsec[L_MAXSEC/2];
8c555625 521 for (int j=0; j<L_MAXSEC/2; j++) lsec[j].SetUp(p);
522
fe4da5cc 523 int ncl=fClusters->GetEntriesFast();
524 while (ncl--) {
525 AliTPCcluster *c=(AliTPCcluster*)fClusters->UncheckedAt(ncl);
8c555625 526
527 int sec=int(c->fSector)-1, row=int(c->fPadRow)-1;
fe4da5cc 528
529 if (sec<24) {
530 if (row<0 || row>nrow_low) {cerr<<"low !!!"<<row<<endl; continue;}
531 ssec[sec%12][row].InsertCluster(c);
532 } else {
533 if (row<0 || row>nrow_up ) {cerr<<"up !!!"<<row<<endl; continue;}
534 sec -= 24;
535 lsec[sec%24][row].InsertCluster(c);
536 }
537 }
538
539
540 TObjArray seeds(20000);
8c555625 541 MakeSeeds(seeds,lsec,nrow_up-1,nrow_up-1-8,p);
542 MakeSeeds(seeds,lsec,nrow_up-1-4,nrow_up-1-4-8,p);
543
fe4da5cc 544 seeds.Sort();
545
546 int found=0;
547 int nseed=seeds.GetEntriesFast();
548
549 for (int s=0; s<nseed; s++) {
550 AliTPCtrack& t=*((AliTPCtrack*)seeds.UncheckedAt(s));
551 Double_t alpha=t.GetAlpha();
552 if (alpha > 2.*TMath::Pi()) alpha -= 2.*TMath::Pi();
553 if (alpha < 0. ) alpha += 2.*TMath::Pi();
554 int ns=int(alpha/lsec->GetAlpha() + 0.5);
555
556 Double_t x=t.GetX();
557 int nr;
8c555625 558 if (x<p->GetPadRowRadiiUp(nrow_up-1-4-7)) nr=nrow_up-1-4-8;
559 else if (x<p->GetPadRowRadiiUp(nrow_up-1-7)) nr=nrow_up-1-8;
fe4da5cc 560 else {cerr<<x<<" =x !!!\n"; continue;}
8c555625 561
fe4da5cc 562 int ls=FindProlongation(t,lsec,ns,nr-1);
8c555625 563 if (ls<0) continue;
fe4da5cc 564 x=t.GetX(); alpha=lsec[ls].GetAlpha(); //
565 Double_t phi=ls*alpha + atan(t.GetY()/x); // Find S-sector
566 int ss=int(0.5*(phi/alpha+1)); //
567 alpha *= 2*(ss-0.5*ls); // and rotation angle
568 if (!t.Rotate(alpha)) continue; //
569 ss %= (S_MAXSEC/2); //
570
8c555625 571 if (FindProlongation(t,ssec,ss,nrow_low-1)<0) continue;
fe4da5cc 572 if (t < 30) continue;
573
574 AddTrack(t);
575 t.UseClusters();
576 cerr<<found++<<'\r';
577 }
578}
579
580//_____________________________________________________________________________
581void AliTPC::CreateMaterials()
582{
8c555625 583 //-----------------------------------------------
fe4da5cc 584 // Create Materials for for TPC
8c555625 585 //-----------------------------------------------
586
587 //-----------------------------------------------------------------
588 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
589 //-----------------------------------------------------------------
1283eee5 590
fe4da5cc 591 Int_t ISXFLD=gAlice->Field()->Integ();
592 Float_t SXMGMX=gAlice->Field()->Max();
1283eee5 593
594 Float_t amat[5]; // atomic numbers
595 Float_t zmat[5]; // z
596 Float_t wmat[5]; // proportions
597
598 Float_t density;
599
600 // ********************* Gases *******************
601
602 //--------------------------------------------------------------
603 // pure gases
604 //--------------------------------------------------------------
605
606 // Ne
607
608
609 Float_t a_ne = 20.18;
610 Float_t z_ne = 10.;
fe4da5cc 611
1283eee5 612 density = 0.0009;
613
614 AliMaterial(20,"Ne",a_ne,z_ne,density,999.,999.);
615
616 // Ar
617
618 Float_t a_ar = 39.948;
619 Float_t z_ar = 18.;
620
621 density = 0.001782;
622
623 AliMaterial(21,"Ar",a_ar,z_ar,density,999.,999.);
624
625 Float_t a_pure[2];
fe4da5cc 626
1283eee5 627 a_pure[0] = a_ne;
628 a_pure[1] = a_ar;
fe4da5cc 629
1283eee5 630
631 //--------------------------------------------------------------
632 // gases - compounds
633 //--------------------------------------------------------------
634
635 Float_t amol[3];
636
637 // CO2
638
639 amat[0]=12.011;
640 amat[1]=15.9994;
641
642 zmat[0]=6.;
643 zmat[1]=8.;
644
645 wmat[0]=1.;
646 wmat[1]=2.;
647
648 density=0.001977;
649
650 amol[0] = amat[0]*wmat[0]+amat[1]*wmat[1];
651
652 AliMixture(10,"CO2",amat,zmat,density,-2,wmat);
653
654 // CF4
655
656 amat[0]=12.011;
657 amat[1]=18.998;
658
659 zmat[0]=6.;
660 zmat[1]=9.;
661
662 wmat[0]=1.;
663 wmat[1]=4.;
664
665 density=0.003034;
666
667 amol[1] = amat[0]*wmat[0]+amat[1]*wmat[1];
668
669 AliMixture(11,"CF4",amat,zmat,density,-2,wmat);
670
671 // CH4
672
673 amat[0]=12.011;
674 amat[1]=1.;
675
676 zmat[0]=6.;
677 zmat[1]=1.;
678
679 wmat[0]=1.;
680 wmat[1]=4.;
681
682 density=0.000717;
683
684 amol[2] = amat[0]*wmat[0]+amat[1]*wmat[1];
685
686 AliMixture(12,"CH4",amat,zmat,density,-2,wmat);
687
688 //----------------------------------------------------------------
689 // gases - mixtures, ID >= 20 pure gases, <= 10 ID < 20 -compounds
690 //----------------------------------------------------------------
691
fe4da5cc 692 char namate[21];
1283eee5 693
694 density = 0.;
695 Float_t am=0;
696 Int_t nc;
697
698 Float_t a,z,rho,absl,X0,buf[1];
699 Int_t nbuf;
700
701 for(nc = 0;nc<fNoComp;nc++)
702 {
703
704 // retrive material constants
705
706 gMC->Gfmate((*fIdmate)[fMixtComp[nc]],namate,a,z,rho,X0,absl,buf,nbuf);
707
708 amat[nc] = a;
709 zmat[nc] = z;
710
711 Int_t nnc = (fMixtComp[nc]>=20) ? fMixtComp[nc]%20 : fMixtComp[nc]%10;
712
713 am += fMixtProp[nc]*((fMixtComp[nc]>=20) ? a_pure[nnc] : amol[nnc]);
714 density += fMixtProp[nc]*rho; // density of the mixture
715
716 }
717
718 // mixture proportions by weight!
719
720 for(nc = 0;nc<fNoComp;nc++)
721 {
722
723 Int_t nnc = (fMixtComp[nc]>=20) ? fMixtComp[nc]%20 : fMixtComp[nc]%10;
724
725 wmat[nc] = fMixtProp[nc]*((fMixtComp[nc]>=20) ? a_pure[nnc] : amol[nnc])/am;
726
727 }
fe4da5cc 728
1283eee5 729 AliMixture(31,"Drift gas 1",amat,zmat,density,fNoComp,wmat);
730 AliMixture(32,"Drift gas 2",amat,zmat,density,fNoComp,wmat);
731 AliMixture(33,"Drift gas 3",amat,zmat,density,fNoComp,wmat);
732
733 AliMedium(2, "Drift gas 1", 31, 0, ISXFLD, SXMGMX, 10., 999.,.1, .001, .001);
734 AliMedium(3, "Drift gas 2", 32, 0, ISXFLD, SXMGMX, 10., 999.,.1, .001, .001);
735 AliMedium(4, "Drift gas 3", 33, 1, ISXFLD, SXMGMX, 10., 999.,.1, .001, .001);
736
737 // Air
738
739 AliMaterial(24, "Air", 14.61, 7.3, .001205, 30420., 67500.);
740
741 AliMedium(24, "Air", 24, 0, ISXFLD, SXMGMX, 10., .1, .1, .1, .1);
742
743 //----------------------------------------------------------------------
744 // solid materials
745 //----------------------------------------------------------------------
746
747 // Al
748
749 AliMaterial(30, "Al", 26.98, 13., 2.7, 8.9, 37.2);
750
751 AliMedium(0, "Al",30, 0, ISXFLD, SXMGMX, 10., .1, .1, .1, .1);
752
753 // Si
754
755 AliMaterial(31, "Si", 28.086, 14.,2.33, 9.36, 999.);
756
757 AliMedium(7, "Al",31, 0, ISXFLD, SXMGMX, 10., .1, .1, .1, .1);
fe4da5cc 758
1283eee5 759
760 // Mylar C5H4O2
761
762 amat[0]=12.011;
763 amat[1]=1.;
764 amat[2]=15.9994;
765
766 zmat[0]=6.;
767 zmat[1]=1.;
768 zmat[2]=8.;
769
770 wmat[0]=5.;
771 wmat[1]=4.;
772 wmat[2]=2.;
773
774 density = 1.39;
fe4da5cc 775
1283eee5 776 AliMixture(32, "Mylar",amat,zmat,density,-3,wmat);
777
778 AliMedium(5, "Mylar",32, 0, ISXFLD, SXMGMX, 10., .1, .1, .001, .01);
779
780
781
782
783 // Carbon (normal)
784
785 AliMaterial(33,"C normal",12.011,6.,2.265,18.8,999.);
786
787 AliMedium(6,"C normal",33,0, ISXFLD, SXMGMX, 10., .1, .1, .001, .01);
788
789 // G10 for inner and outr field cage
790 // G10 is 60% SiO2 + 40% epoxy, right now I use A and Z for SiO2
791
792 Float_t rhoFactor;
793
794 amat[0]=28.086;
795 amat[1]=15.9994;
796
797 zmat[0]=14.;
798 zmat[1]=8.;
799
800 wmat[0]=1.;
801 wmat[1]=2.;
802
803 density = 1.7;
fe4da5cc 804
1283eee5 805
806 AliMixture(34,"G10 aux.",amat,zmat,density,-2,wmat);
807
808
809 gMC->Gfmate((*fIdmate)[34],namate,a,z,rho,X0,absl,buf,nbuf);
810
811 Float_t thickX0 = 0.0052; // field cage in X0 units
fe4da5cc 812
1283eee5 813 Float_t thick = 2.; // in cm
814
815 X0=19.4; // G10
816
817 rhoFactor = X0*thickX0/thick;
818 density = rho*rhoFactor;
819
820 AliMaterial(35,"G10-fc",a,z,density,999.,999.);
821
822 AliMedium(8,"G10-fc",35,0, ISXFLD, SXMGMX, 10., .1, .1, .001, .01);
823
824 thickX0 = 0.0027; // inner vessel (eta <0.9)
825 thick=0.5;
826 rhoFactor = X0*thickX0/thick;
827 density = rho*rhoFactor;
828
829 AliMaterial(36,"G10-iv",a,z,density,999.,999.);
830
831 AliMedium(9,"G10-iv",36,0, ISXFLD, SXMGMX, 10., .1, .1, .001, .01);
832
833 // Carbon fibre
fe4da5cc 834
1283eee5 835 gMC->Gfmate((*fIdmate)[33],namate,a,z,rho,X0,absl,buf,nbuf);
836
837 thickX0 = 0.0133; // outer vessel
838 thick=3.0;
839 rhoFactor = X0*thickX0/thick;
840 density = rho*rhoFactor;
841
842
843 AliMaterial(37,"C-ov",a,z,density,999.,999.);
844
845 AliMedium(10,"C-ov",37,0, ISXFLD, SXMGMX, 10., .1, .1, .001, .01);
846
847 thickX0=0.015; // inner vessel (cone, eta > 0.9)
848 thick=1.5;
849 rhoFactor = X0*thickX0/thick;
850 density = rho*rhoFactor;
851
852 AliMaterial(38,"C-ivc",a,z,density,999.,999.);
853
854 AliMedium(11,"C-ivc",38,0, ISXFLD, SXMGMX, 10., .1, .1, .001, .01);
855
856 //
857
858 AliMedium(12,"CO2",10,0, ISXFLD, SXMGMX, 10., 999.,.1, .001, .001);
859
860
861
fe4da5cc 862}
863
864//_____________________________________________________________________________
865struct Bin {
866 const AliTPCdigit *dig;
867 int idx;
868 Bin() {dig=0; idx=-1;}
869};
870
871struct PreCluster : public AliTPCcluster {
872 const AliTPCdigit* summit;
873 int idx;
874 int cut;
875 int npeaks;
8c555625 876 PreCluster();
fe4da5cc 877};
8c555625 878PreCluster::PreCluster() : AliTPCcluster() {cut=npeaks=0;}
879
fe4da5cc 880
881//_____________________________________________________________________________
882static void FindCluster(int i, int j, Bin bins[][MAXTPCTBK+2], PreCluster &c)
883{
884 //
885 // Find clusters
886 //
887 Bin& b=bins[i][j];
8c555625 888 double q=double(b.dig->fSignal);
889
fe4da5cc 890 if (q<0) { // digit is at the edge of the pad row
891 q=-q;
892 c.cut=1;
893 }
894 if (b.idx >= 0 && b.idx != c.idx) {
895 c.idx=b.idx;
896 c.npeaks++;
897 }
898
899 if (q > TMath::Abs(c.summit->fSignal)) c.summit=b.dig;
900
901 c.fY += i*q;
902 c.fZ += j*q;
903 c.fSigmaY2 += i*i*q;
904 c.fSigmaZ2 += j*j*q;
905 c.fQ += q;
8c555625 906
fe4da5cc 907 b.dig = 0; b.idx = c.idx;
908
909 if (bins[i-1][j].dig) FindCluster(i-1,j,bins,c);
910 if (bins[i][j-1].dig) FindCluster(i,j-1,bins,c);
911 if (bins[i+1][j].dig) FindCluster(i+1,j,bins,c);
912 if (bins[i][j+1].dig) FindCluster(i,j+1,bins,c);
913
914}
915
916//_____________________________________________________________________________
917void AliTPC::Digits2Clusters()
918{
919 //
920 // simple TPC cluster finder from digits.
921 //
8c555625 922 //
923 AliTPCParam * fTPCParam = &(fDigParam->GetParam());
924
fe4da5cc 925 const Int_t MAX_PAD=200+2, MAX_BUCKET=MAXTPCTBK+2;
8c555625 926 const Int_t Q_min=60;
927 const Int_t THRESHOLD=20;
fe4da5cc 928
8c555625 929 TTree *t=(TTree*)gDirectory->Get("TreeD0_Param1");
930 t->GetBranch("Digits")->SetAddress(&fDigits);
fe4da5cc 931 Int_t sectors_by_rows=(Int_t)t->GetEntries();
932
933 int ncls=0;
934
935 for (Int_t n=0; n<sectors_by_rows; n++) {
936 if (!t->GetEvent(n)) continue;
937 Bin bins[MAX_PAD][MAX_BUCKET];
938 AliTPCdigit *dig=(AliTPCdigit*)fDigits->UncheckedAt(0);
939 Int_t nsec=dig->fSector, nrow=dig->fPadRow;
940 Int_t ndigits=fDigits->GetEntriesFast();
941
942 int npads; int sign_z;
943 if (nsec<25) {
944 sign_z=(nsec<13) ? 1 : -1;
8c555625 945 npads=fTPCParam->GetNPadsLow(nrow-1);
fe4da5cc 946 } else {
947 sign_z=(nsec<49) ? 1 : -1;
8c555625 948 npads=fTPCParam->GetNPadsUp(nrow-1);
fe4da5cc 949 }
950
951 int ndig;
952 for (ndig=0; ndig<ndigits; ndig++) {
953 dig=(AliTPCdigit*)fDigits->UncheckedAt(ndig);
954 int i=dig->fPad, j=dig->fTime;
955 if (dig->fSignal >= THRESHOLD) bins[i][j].dig=dig;
956 if (i==1 || i==npads || j==1 || j==MAXTPCTBK) dig->fSignal*=-1;
957 }
958
959 int ncl=0;
960 int i,j;
8c555625 961
fe4da5cc 962 for (i=1; i<MAX_PAD-1; i++) {
963 for (j=1; j<MAX_BUCKET-1; j++) {
964 if (bins[i][j].dig == 0) continue;
965 PreCluster c; c.summit=bins[i][j].dig; c.idx=ncls;
966 FindCluster(i, j, bins, c);
fe4da5cc 967 c.fY /= c.fQ;
968 c.fZ /= c.fQ;
8c555625 969
970 double s2 = c.fSigmaY2/c.fQ - c.fY*c.fY;
971 c.fSigmaY2 = s2 + 1./12.;
972 c.fSigmaY2 *= fTPCParam->GetPadPitchWidth()*
973 fTPCParam->GetPadPitchWidth();
974 if (s2 != 0.) c.fSigmaY2 *= 0.022*8*4;
975
976 s2 = c.fSigmaZ2/c.fQ - c.fZ*c.fZ;
977 c.fSigmaZ2 = s2 + 1./12.;
978 c.fSigmaZ2 *= fTPCParam->GetZWidth()*fTPCParam->GetZWidth();
979 if (s2 != 0.) c.fSigmaZ2 *= 0.068*4*4;
980
981 c.fY = (c.fY - 0.5 - 0.5*npads)*fTPCParam->GetPadPitchWidth();
982 c.fZ = fTPCParam->GetZWidth()*(c.fZ+1);
983 c.fZ -= 3.*fTPCParam->GetZSigma(); // PASA delay
fe4da5cc 984 c.fZ = sign_z*(z_end - c.fZ);
8c555625 985 //c.fZ += 0.023;
986 c.fSector=nsec;
987 c.fPadRow=nrow;
fe4da5cc 988 c.fTracks[0]=c.summit->fTracks[0];
989 c.fTracks[1]=c.summit->fTracks[1];
990 c.fTracks[2]=c.summit->fTracks[2];
8c555625 991
fe4da5cc 992 if (c.cut) {
993 c.fSigmaY2 *= 25.;
994 c.fSigmaZ2 *= 4.;
995 }
996
997 AddCluster(c); ncls++; ncl++;
998 }
999 }
1000
1001 for (ndig=0; ndig<ndigits; ndig++) {
1002 dig=(AliTPCdigit*)fDigits->UncheckedAt(ndig);
8c555625 1003 if (TMath::Abs(dig->fSignal) >= 0)
fe4da5cc 1004 bins[dig->fPad][dig->fTime].dig=dig;
1005 }
1006
1007 for (i=1; i<MAX_PAD-1; i++) {
1008 for (j=1; j<MAX_BUCKET-1; j++) {
1009 if (bins[i][j].dig == 0) continue;
1010 PreCluster c; c.summit=bins[i][j].dig; c.idx=ncls;
1011 FindCluster(i, j, bins, c);
1012 if (c.fQ <= Q_min) continue; //noise cluster
8c555625 1013 if (c.npeaks>1) continue; //overlapped cluster
fe4da5cc 1014 c.fY /= c.fQ;
1015 c.fZ /= c.fQ;
8c555625 1016
1017 double s2 = c.fSigmaY2/c.fQ - c.fY*c.fY;
1018 c.fSigmaY2 = s2 + 1./12.;
1019 c.fSigmaY2 *= fTPCParam->GetPadPitchWidth()*
1020 fTPCParam->GetPadPitchWidth();
1021 if (s2 != 0.) c.fSigmaY2 *= 0.022*4*0.6*4;
1022
1023 s2 = c.fSigmaZ2/c.fQ - c.fZ*c.fZ;
1024 c.fSigmaZ2 = s2 + 1./12.;
1025 c.fSigmaZ2 *= fTPCParam->GetZWidth()*fTPCParam->GetZWidth();
1026 if (s2 != 0.) c.fSigmaZ2 *= 0.068*4*0.4;
1027
1028 c.fY = (c.fY - 0.5 - 0.5*npads)*fTPCParam->GetPadPitchWidth();
1029 c.fZ = fTPCParam->GetZWidth()*(c.fZ+1);
1030 c.fZ -= 3.*fTPCParam->GetZSigma(); // PASA delay
fe4da5cc 1031 c.fZ = sign_z*(z_end - c.fZ);
8c555625 1032 //c.fZ += 0.023;
1033 c.fSector=nsec;
1034 c.fPadRow=nrow;
fe4da5cc 1035 c.fTracks[0]=c.summit->fTracks[0];
1036 c.fTracks[1]=c.summit->fTracks[1];
1037 c.fTracks[2]=c.summit->fTracks[2];
1038
1039 if (c.cut) {
1040 c.fSigmaY2 *= 25.;
1041 c.fSigmaZ2 *= 4.;
1042 }
1043
1044 if (c.npeaks==0) {AddCluster(c); ncls++; ncl++;}
1045 else {
1046 new ((*fClusters)[c.idx]) AliTPCcluster(c);
1047 }
1048 }
1049 }
1050
1051 cerr<<"sector, row, digits, clusters: "
1052 <<nsec<<' '<<nrow<<' '<<ndigits<<' '<<ncl<<" \r";
1053
1054 fDigits->Clear();
1055
1056 }
1057}
1058
1059//_____________________________________________________________________________
1060void AliTPC::ElDiff(Float_t *xyz)
1061{
8c555625 1062 //--------------------------------------------------
fe4da5cc 1063 // calculates the diffusion of a single electron
8c555625 1064 //--------------------------------------------------
1065
1066 //-----------------------------------------------------------------
1067 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
1068 //-----------------------------------------------------------------
1069 AliTPCParam * fTPCParam = &(fDigParam->GetParam());
fe4da5cc 1070 Float_t driftl;
8c555625 1071
fe4da5cc 1072 Float_t z0=xyz[2];
8c555625 1073
fe4da5cc 1074 driftl=z_end-TMath::Abs(xyz[2]);
8c555625 1075
fe4da5cc 1076 if(driftl<0.01) driftl=0.01;
8c555625 1077
1078 // check the attachment
1079
fe4da5cc 1080 driftl=TMath::Sqrt(driftl);
8c555625 1081
1082 // Float_t sig_t = driftl*diff_t;
1083 //Float_t sig_l = driftl*diff_l;
1084 Float_t sig_t = driftl*fTPCParam->GetDiffT();
1085 Float_t sig_l = driftl*fTPCParam->GetDiffL();
fe4da5cc 1086 xyz[0]=gRandom->Gaus(xyz[0],sig_t);
1087 xyz[1]=gRandom->Gaus(xyz[1],sig_t);
1088 xyz[2]=gRandom->Gaus(xyz[2],sig_l);
8c555625 1089
fe4da5cc 1090 if (TMath::Abs(xyz[2])>z_end){
8c555625 1091 xyz[2]=TMath::Sign(z_end,z0);
fe4da5cc 1092 }
1093 if(xyz[2]*z0 < 0.){
8c555625 1094 Float_t eps = 0.0001;
1095 xyz[2]=TMath::Sign(eps,z0);
fe4da5cc 1096 }
1097}
1098
1099//_____________________________________________________________________________
1100void AliTPC::Hits2Clusters()
1101{
8c555625 1102 //--------------------------------------------------------
fe4da5cc 1103 // TPC simple cluster generator from hits
1104 // obtained from the TPC Fast Simulator
8c555625 1105 // The point errors are taken from the parametrization
1106 //--------------------------------------------------------
1107
1108 //-----------------------------------------------------------------
1109 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
1110 //-----------------------------------------------------------------
1111 AliTPCParam * fTPCParam = &(fDigParam->GetParam());
fe4da5cc 1112 Float_t sigma_rphi,sigma_z,cl_rphi,cl_z;
1113 //
1578254f 1114 TParticle *particle; // pointer to a given particle
fe4da5cc 1115 AliTPChit *tpcHit; // pointer to a sigle TPC hit
1116 TClonesArray *Particles; //pointer to the particle list
1117 Int_t sector,nhits;
1118 Int_t ipart;
1119 Float_t xyz[5];
1120 Float_t pl,pt,tanth,rpad,ratio;
fe4da5cc 1121 Float_t cph,sph;
1122
1123 //---------------------------------------------------------------
1124 // Get the access to the tracks
1125 //---------------------------------------------------------------
1126
1127 TTree *TH = gAlice->TreeH();
1128 Stat_t ntracks = TH->GetEntries();
1129
1130 //------------------------------------------------------------
1131 // Loop over all sectors (72 sectors)
1132 // Sectors 1-24 are lower sectors, 1-12 z>0, 13-24 z<0
1133 // Sectors 25-72 are upper sectors, 25-48 z>0, 49-72 z<0
1134 //
1135 // First cluster for sector 1 starts at "0"
1136 //------------------------------------------------------------
1137
1138
1139 fClustersIndex[0] = 0;
1140
1141 //
1142 for(Int_t isec=1;isec<fNsectors+1;isec++){
8c555625 1143 //MI change
1144 fTPCParam->AdjustAngles(isec,cph,sph);
fe4da5cc 1145
1146 //------------------------------------------------------------
1147 // Loop over tracks
1148 //------------------------------------------------------------
1149
1150 for(Int_t track=0;track<ntracks;track++){
1151 ResetHits();
1152 TH->GetEvent(track);
1153 //
1154 // Get number of the TPC hits and a pointer
1155 // to the particles
1156 //
1157 nhits=fHits->GetEntriesFast();
1158 Particles=gAlice->Particles();
1159 //
1160 // Loop over hits
1161 //
1162 for(Int_t hit=0;hit<nhits;hit++){
1163 tpcHit=(AliTPChit*)fHits->UncheckedAt(hit);
1164 sector=tpcHit->fSector; // sector number
1165 if(sector != isec) continue; //terminate iteration
1166 ipart=tpcHit->fTrack;
1578254f 1167 particle=(TParticle*)Particles->UncheckedAt(ipart);
1168 pl=particle->Pz();
1169 pt=particle->Pt();
fe4da5cc 1170 if(pt < 1.e-9) pt=1.e-9;
1171 tanth=pl/pt;
1172 tanth = TMath::Abs(tanth);
1173 rpad=TMath::Sqrt(tpcHit->fX*tpcHit->fX + tpcHit->fY*tpcHit->fY);
1174 ratio=0.001*rpad/pt; // pt must be in MeV/c - historical reason
1175
1176 // space-point resolutions
1177
1178 sigma_rphi=SigmaY2(rpad,tanth,pt);
1179 sigma_z =SigmaZ2(rpad,tanth );
1180
1181 // cluster widths
1182
1183 cl_rphi=ac_rphi-bc_rphi*rpad*tanth+cc_rphi*ratio*ratio;
1184 cl_z=ac_z-bc_z*rpad*tanth+cc_z*tanth*tanth;
1185
1186 // temporary protection
1187
1188 if(sigma_rphi < 0.) sigma_rphi=0.4e-3;
1189 if(sigma_z < 0.) sigma_z=0.4e-3;
1190 if(cl_rphi < 0.) cl_rphi=2.5e-3;
1191 if(cl_z < 0.) cl_z=2.5e-5;
1192
1193 //
1194
1195 //
1196 // smearing --> rotate to the 1 (13) or to the 25 (49) sector,
1197 // then the inaccuracy in a X-Y plane is only along Y (pad row)!
1198 //
1199 Float_t xprim= tpcHit->fX*cph + tpcHit->fY*sph;
1200 Float_t yprim=-tpcHit->fX*sph + tpcHit->fY*cph;
1201 xyz[0]=gRandom->Gaus(yprim,TMath::Sqrt(sigma_rphi)); // y
8c555625 1202 Double_t alpha=(sector<25) ? alpha_low : alpha_up;
1203 if (TMath::Abs(xyz[0]/xprim) > TMath::Tan(0.5*alpha)) xyz[0]=yprim;
fe4da5cc 1204 xyz[1]=gRandom->Gaus(tpcHit->fZ,TMath::Sqrt(sigma_z)); // z
8c555625 1205 if (TMath::Abs(xyz[1]) > 250) xyz[1]=tpcHit->fZ;
fe4da5cc 1206 xyz[2]=tpcHit->fQ; // q
1207 xyz[3]=sigma_rphi; // fSigmaY2
1208 xyz[4]=sigma_z; // fSigmaZ2
1283eee5 1209
fe4da5cc 1210 // and finally add the cluster
1283eee5 1211 Int_t tracks[5]={tpcHit->fTrack, -1, -1, sector, tpcHit->fPadRow};
fe4da5cc 1212 AddCluster(xyz,tracks);
1213
1214 } // end of loop over hits
1215 } // end of loop over tracks
1216
1217 fClustersIndex[isec] = fNclusters; // update clusters index
1218
1219 } // end of loop over sectors
1220
1221 fClustersIndex[fNsectors]--; // set end of the clusters buffer
1222
1223}
1224
8c555625 1225
1226void AliTPC::Hits2Digits()
1227{
1228
1229 //----------------------------------------------------
1230 // Loop over all sectors (72 sectors)
1231 // Sectors 1-24 are lower sectors, 1-12 z>0, 13-24 z<0
1232 // Sectors 25-72 are upper sectors, 25-48 z>0, 49-72 z<0
1233 //----
1283eee5 1234 for(Int_t isec=0;isec<fNsectors;isec++) Hits2DigitsSector(isec);
8c555625 1235}
1236
1237
fe4da5cc 1238//_____________________________________________________________________________
8c555625 1239void AliTPC::Hits2DigitsSector(Int_t isec)
fe4da5cc 1240{
8c555625 1241 //-------------------------------------------------------------------
fe4da5cc 1242 // TPC conversion from hits to digits.
8c555625 1243 //-------------------------------------------------------------------
1244
1245 //-----------------------------------------------------------------
1246 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
1247 //-----------------------------------------------------------------
1248
fe4da5cc 1249 //-------------------------------------------------------
8c555625 1250 // Get the access to the track hits
fe4da5cc 1251 //-------------------------------------------------------
8c555625 1252
1253 AliTPCParam * fTPCParam = &(fDigParam->GetParam());
1254 TTree *TH = gAlice->TreeH(); // pointer to the hits tree
fe4da5cc 1255 Stat_t ntracks = TH->GetEntries();
8c555625 1256
1257 if( ntracks > 0){
1258
1259 //-------------------------------------------
1260 // Only if there are any tracks...
1261 //-------------------------------------------
1262
fe4da5cc 1263
8c555625 1264 // TObjArrays for three neighouring pad-rows
1265
1266 TObjArray **rowTriplet = new TObjArray* [3];
fe4da5cc 1267
8c555625 1268 // TObjArray-s for each pad-row
1269
1270 TObjArray **row;
1271
1272 for (Int_t trip=0;trip<3;trip++){
1273 rowTriplet[trip]=new TObjArray;
fe4da5cc 1274 }
8c555625 1275
1276
fe4da5cc 1277
8c555625 1278 printf("*** Processing sector number %d ***\n",isec);
1279
1280 Int_t nrows =fTPCParam->GetNRow(isec);
1281
1282 row= new TObjArray* [nrows];
fe4da5cc 1283
8c555625 1284 MakeSector(isec,nrows,TH,ntracks,row);
1285
1286 //--------------------------------------------------------
1287 // Digitize this sector, row by row
1288 // row[i] is the pointer to the TObjArray of TVectors,
1289 // each one containing electrons accepted on this
1290 // row, assigned into tracks
1291 //--------------------------------------------------------
1292
1293 Int_t i;
1294
1295 for (i=0;i<nrows;i++){
1296
1297 // Triplets for i = 0 and i=1 are identical!
1298 // The same for i = nrows-1 and nrows!
1299
1300 if(i != 1 && i != nrows-1){
1301 MakeTriplet(i,rowTriplet,row);
1302 }
1303
1304 DigitizeRow(i,isec,rowTriplet);
1305
1306 fDigParam->Fill();
1307
1308 Int_t ndig=fDigParam->GetArray()->GetEntriesFast();
1309
1310 printf("*** Sector, row, digits %d %d %d ***\n",isec,i,ndig);
1311
1312 ResetDigits(); // reset digits for this row after storing them
1313
1314 } // end of the sector digitization
1315
1316 // delete the last triplet
1317
1318 for (i=0;i<3;i++) rowTriplet[i]->Delete();
1319
1320 delete [] row; // delete the array of pointers to TObjArray-s
1321
1322 } // ntracks >0
1323} // end of Hits2Digits
1324//_____________________________________________________________________________
1325void AliTPC::MakeTriplet(Int_t row,
1326 TObjArray **rowTriplet, TObjArray **prow)
1327{
1328 //------------------------------------------------------------------
1329 // Makes the "triplet" of the neighbouring pad-row for the
1330 // digitization including the cross-talk between the pad-rows
1331 //------------------------------------------------------------------
1332
1333 //-----------------------------------------------------------------
1334 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
1335 //-----------------------------------------------------------------
1336
1337 AliTPCParam * fTPCParam = &(fDigParam->GetParam());
1338 Float_t gasgain = fTPCParam->GetGasGain();
1339 Int_t nTracks[3];
1340
1341 Int_t nElements,nElectrons;
1342
1343 TVector *pv;
1344 TVector *tv;
1345
1346 //-------------------------------------------------------------------
1347 // pv is an "old" track, i.e. label + triplets of (x,y,z)
1348 // for each electron
1349 //
1350 //-------------------------------------------------------------------
1351
1352
1353 Int_t i1,i2;
1354 Int_t nel,nt;
1355
1356 if(row == 0 || row == 1){
1357
1358 // create entire triplet for the first AND the second row
1359
1360 nTracks[0] = prow[0]->GetEntries();
1361 nTracks[1] = prow[1]->GetEntries();
1362 nTracks[2] = prow[2]->GetEntries();
1363
1364 for(i1=0;i1<3;i1++){
1365 nt = nTracks[i1]; // number of tracks for this row
1366
1367 for(i2=0;i2<nt;i2++){
1368 pv = (TVector*)prow[i1]->At(i2);
1369 TVector &v1 = *pv;
1370 nElements = pv->GetNrows();
1371 nElectrons = (nElements-1)/3;
1372
1373 tv = new TVector(4*nElectrons+1); // create TVector for a modified track
1374 TVector &v2 = *tv;
1375 v2(0)=v1(0); //track label
1376
1377 for(nel=0;nel<nElectrons;nel++){
1378 Int_t idx1 = nel*3;
1379 Int_t idx2 = nel*4;
1380 // Avalanche, including fluctuations
1381 Int_t aval = (Int_t) (-gasgain*TMath::Log(gRandom->Rndm()));
1382 v2(idx2+1)= v1(idx1+1);
1383 v2(idx2+2)= v1(idx1+2);
1384 v2(idx2+3)= v1(idx1+3);
1385 v2(idx2+4)= (Float_t)aval; // in number of electrons!
1386 } // end of loop over electrons
1387 //
1388 // Add this track to a row
1389 //
1390
1391 rowTriplet[i1]->Add(tv);
1392
1393
1394 } // end of loop over tracks for this row
1395
1396 prow[i1]->Delete(); // remove "old" tracks
1397 delete prow[i1]; // delete TObjArray for this row
1398 prow[i1]=0; // set pointer to NULL
1399
1400 } // end of loop over row triplets
1401
1402
1403 }
1404 else{
1405
1406 rowTriplet[0]->Delete(); // remove old lower row
1407
1408 nTracks[0]=rowTriplet[1]->GetEntries(); // previous middle row
1409 nTracks[1]=rowTriplet[2]->GetEntries(); // previous upper row
1410 nTracks[2]=prow[row+1]->GetEntries(); // next row
1411
1412
1413 //-------------------------------------------
1414 // shift new tracks downwards
1415 //-------------------------------------------
1416
1417 for(i1=0;i1<nTracks[0];i1++){
1418 pv=(TVector*)rowTriplet[1]->At(i1);
1419 rowTriplet[0]->Add(pv);
1420 }
1421
1422 rowTriplet[1]->Clear(); // leave tracks on the heap!!!
1423
1424 for(i1=0;i1<nTracks[1];i1++){
1425 pv=(TVector*)rowTriplet[2]->At(i1);
1426 rowTriplet[1]->Add(pv);
1427 }
1428
1429 rowTriplet[2]->Clear(); // leave tracks on the heap!!!
1430
1431 //---------------------------------------------
1432 // Create new upper row
1433 //---------------------------------------------
1434
1435
1436
1437 for(i1=0;i1<nTracks[2];i1++){
1438 pv = (TVector*)prow[row+1]->At(i1);
1439 TVector &v1 = *pv;
1440 nElements = pv->GetNrows();
1441 nElectrons = (nElements-1)/3;
1442
1443 tv = new TVector(4*nElectrons+1); // create TVector for a modified track
1444 TVector &v2 = *tv;
1445 v2(0)=v1(0); //track label
1446
1447 for(nel=0;nel<nElectrons;nel++){
1448
1449 Int_t idx1 = nel*3;
1450 Int_t idx2 = nel*4;
1451 // Avalanche, including fluctuations
1452 Int_t aval = (Int_t)
1453 (-gasgain*TMath::Log(gRandom->Rndm()));
1454
1455 v2(idx2+1)= v1(idx1+1);
1456 v2(idx2+2)= v1(idx1+2);
1457 v2(idx2+3)= v1(idx1+3);
1458 v2(idx2+4)= (Float_t)aval; // in number of electrons!
1459 } // end of loop over electrons
1460
1461 rowTriplet[2]->Add(tv);
1462
1463 } // end of loop over tracks
1464
1465 prow[row+1]->Delete(); // delete tracks for this row
1466 delete prow[row+1]; // delete TObjArray for this row
1467 prow[row+1]=0; // set a pointer to NULL
1468
1469 }
1470
1471} // end of MakeTriplet
1472//_____________________________________________________________________________
1473void AliTPC::ExB(Float_t *xyz)
1474{
1475 //------------------------------------------------
1476 // ExB at the wires and wire number calulation
1477 //------------------------------------------------
1478
1479 //-----------------------------------------------------------------
1480 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
1481 //-----------------------------------------------------------------
1482 AliTPCParam * fTPCParam = &(fDigParam->GetParam());
1483
1484 Float_t x1=xyz[0];
1485 fTPCParam->GetWire(x1); //calculate nearest wire position
1486 Float_t dx=xyz[0]-x1;
1487 xyz[1]+=dx*fTPCParam->GetOmegaTau();
1488
1489} // end of ExB
1490//_____________________________________________________________________________
1491void AliTPC::DigitizeRow(Int_t irow,Int_t isec,TObjArray **rowTriplet)
1492{
1493 //-----------------------------------------------------------
1494 // Single row digitization, coupling from the neighbouring
1495 // rows taken into account
1496 //-----------------------------------------------------------
1497
1498 //-----------------------------------------------------------------
1499 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
1500 //-----------------------------------------------------------------
1501
1502
1503 AliTPCParam * fTPCParam = &(fDigParam->GetParam());
1504 Float_t chipgain= fTPCParam->GetChipGain();
1505 Float_t zerosup = fTPCParam->GetZeroSup();
1506 Int_t nrows =fTPCParam->GetNRow(isec);
1507
1508 Int_t nTracks[3];
1509 Int_t n_of_pads[3];
1510 Int_t IndexRange[4];
1511 Int_t i1;
1512 Int_t iFlag;
1513
1514 //
1515 // iFlag = 0 -> inner row, iFlag = 1 -> the middle one, iFlag = 2 -> the outer one
1516 //
1517
1518 nTracks[0]=rowTriplet[0]->GetEntries(); // lower row
1519 nTracks[1]=rowTriplet[1]->GetEntries(); // middle row
1520 nTracks[2]=rowTriplet[2]->GetEntries(); // upper row
1521
1522
1523 if(irow == 0){
1524 iFlag=0;
1525 n_of_pads[0]=fTPCParam->GetNPads(isec,0);
1526 n_of_pads[1]=fTPCParam->GetNPads(isec,1);
1527 }
1528 else if(irow == nrows-1){
1529 iFlag=2;
1530 n_of_pads[1]=fTPCParam->GetNPads(isec,irow-1);
1531 n_of_pads[2]=fTPCParam->GetNPads(isec,irow);
1532 }
1533 else {
1534 iFlag=1;
1535 for(i1=0;i1<3;i1++){
1536 n_of_pads[i1]=fTPCParam->GetNPads(isec,irow-1+i1);
1537 }
1538 }
1539
1540 //
1541 // Integrated signal for this row
1542 // and a single track signal
1543 //
1544
1283eee5 1545 TMatrix *m1 = new TMatrix(0,n_of_pads[iFlag]-1,0,MAXTPCTBK-1); // integrated
1546 TMatrix *m2 = new TMatrix(0,n_of_pads[iFlag]-1,0,MAXTPCTBK-1); // single
8c555625 1547
1548 //
1549
1550 TMatrix &Total = *m1;
1551
1552 // Array of pointers to the label-signal list
1553
1554 Int_t NofDigits = n_of_pads[iFlag]*MAXTPCTBK; // number of digits for this row
1555
1556 Float_t **pList = new Float_t* [NofDigits];
1557
1558 Int_t lp;
1559
1560 for(lp=0;lp<NofDigits;lp++)pList[lp]=0; // set all pointers to NULL
1561
1562 //
1563 // Straight signal and cross-talk, cross-talk is integrated over all
1564 // tracks and added to the signal at the very end
1565 //
1566
1567
1568 for (i1=0;i1<nTracks[iFlag];i1++){
1569
1570 m2->Zero(); // clear single track signal matrix
1571
1572 Float_t TrackLabel =
1573 GetSignal(rowTriplet[iFlag],i1,n_of_pads[iFlag],m2,m1,IndexRange);
1574
1575 GetList(TrackLabel,n_of_pads[iFlag],m2,IndexRange,pList);
1576
1577 }
1578
1579 //
1580 // Cross talk from the neighbouring pad-rows
1581 //
1582
1283eee5 1583 TMatrix *m3 = new TMatrix(0,n_of_pads[iFlag]-1,0,MAXTPCTBK-1); // cross-talk
8c555625 1584
1585 TMatrix &Cross = *m3;
1586
1587 if(iFlag == 0){
1588
1589 // cross-talk from the outer row only (first pad row)
1590
1591 GetCrossTalk(0,rowTriplet[1],nTracks[1],n_of_pads,m3);
1592
1593 }
1594 else if(iFlag == 2){
1595
1596 // cross-talk from the inner row only (last pad row)
1597
1598 GetCrossTalk(2,rowTriplet[1],nTracks[1],n_of_pads,m3);
1599
1600 }
1601 else{
1602
1603 // cross-talk from both inner and outer rows
1604
1605 GetCrossTalk(3,rowTriplet[0],nTracks[0],n_of_pads,m3); // inner
1606 GetCrossTalk(4,rowTriplet[2],nTracks[2],n_of_pads,m3); //outer
1607 }
1608
1609 Total += Cross; // add the cross-talk
1610
1611 //
1612 // Convert analog signal to ADC counts
1613 //
1614
1615 Int_t tracks[3];
1616 Int_t digits[5];
1617
1618
1283eee5 1619 for(Int_t ip=0;ip<n_of_pads[iFlag];ip++){
1620 for(Int_t it=0;it<MAXTPCTBK;it++){
8c555625 1621
1622 Float_t q = Total(ip,it);
1623
1283eee5 1624 Int_t gi =it*n_of_pads[iFlag]+ip; // global index
8c555625 1625
1626 q = gRandom->Gaus(q,fTPCParam->GetNoise()); // apply noise
1627 q *= (q_el*1.e15); // convert to fC
1628 q *= chipgain; // convert to mV
1629 q *= (adc_sat/dyn_range); // convert to ADC counts
1630
1631 if(q <zerosup) continue; // do not fill zeros
1632 if(q > adc_sat) q = adc_sat; // saturation
1633
1634 //
1635 // "real" signal or electronic noise (list = -1)?
1636 //
1637
1638 for(Int_t j1=0;j1<3;j1++){
1639 tracks[j1] = (pList[gi]) ?(Int_t)(*(pList[gi]+j1)) : -1;
1640 }
1641
1642 digits[0]=isec;
1283eee5 1643 digits[1]=irow;
8c555625 1644 digits[2]=ip;
1645 digits[3]=it;
1646 digits[4]= (Int_t)q;
1647
1648 // Add this digit
1649
1650 AddDigit(tracks,digits);
1651
1652 } // end of loop over time buckets
1653 } // end of lop over pads
1654
1655 //
1656 // This row has been digitized, delete nonused stuff
1657 //
1658
1659 for(lp=0;lp<NofDigits;lp++){
1660 if(pList[lp]) delete [] pList[lp];
1661 }
1662
1663 delete [] pList;
1664
1665 delete m1;
1666 delete m2;
1667 delete m3;
1668
1669} // end of DigitizeRow
1670//_____________________________________________________________________________
1671Float_t AliTPC::GetSignal(TObjArray *p1, Int_t ntr, Int_t np, TMatrix *m1, TMatrix *m2,
1672 Int_t *IndexRange)
1673{
1674
1675 //---------------------------------------------------------------
1676 // Calculates 2-D signal (pad,time) for a single track,
1677 // returns a pointer to the signal matrix and the track label
1678 // No digitization is performed at this level!!!
1679 //---------------------------------------------------------------
1680
1681 //-----------------------------------------------------------------
1682 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
1683 //-----------------------------------------------------------------
1684
1685 TVector *tv;
1686 AliTPCParam * fTPCParam = &(fDigParam->GetParam());
1687 AliTPCPRF2D * fPRF2D = &(fDigParam->GetPRF2D());
1688 AliTPCRF1D * fRF = &(fDigParam->GetRF());
1689
1690 //to make the code faster we put parameters to the stack
1691
1692 Float_t zwidth = fTPCParam->GetZWidth();
7ee081c2 1693 Float_t zwidthm1 =1./zwidth;
8c555625 1694
1695 tv = (TVector*)p1->At(ntr); // pointer to a track
1696 TVector &v = *tv;
1697
1698 Float_t label = v(0);
1699
1283eee5 1700 Int_t CentralPad = (np-1)/2;
8c555625 1701 Int_t PadNumber;
1702 Int_t nElectrons = (tv->GetNrows()-1)/4;
1703 Float_t range=((np-1)/2 + 0.5)*fTPCParam->GetPadPitchWidth(); // pad range
8c555625 1704
1283eee5 1705 range -= 0.5; // dead zone, 5mm from the edge, according to H.G. Fischer
1706
8c555625 1707 Float_t IneffFactor = 0.5; // inefficiency in the gain close to the edge, as above
1708
1709
1710 Float_t PadSignal[7]; // signal from a single electron
1711
1712 TMatrix &signal = *m1;
1713 TMatrix &total = *m2;
1714
1715
1716 IndexRange[0]=9999; // min pad
1717 IndexRange[1]=-1; // max pad
1718 IndexRange[2]=9999; //min time
1719 IndexRange[3]=-1; // max time
1720
1721 //
1722 // Loop over all electrons
1723 //
1724
1725 for(Int_t nel=0; nel<nElectrons; nel++){
1726 Int_t idx=nel*4;
1727 Float_t xwire = v(idx+1);
1728 Float_t y = v(idx+2);
1729 Float_t z = v(idx+3);
1730
1731
1732 Float_t absy=TMath::Abs(y);
1733
1734 if(absy < 0.5*fTPCParam->GetPadPitchWidth()){
1735 PadNumber=CentralPad;
1736 }
1737 else if (absy < range){
8022212f 1738 PadNumber=(Int_t) ((absy-0.5*fTPCParam->GetPadPitchWidth())/fTPCParam->GetPadPitchWidth()+1.);
8c555625 1739 PadNumber=(Int_t) (TMath::Sign((Float_t)PadNumber, y)+CentralPad);
1740 }
1741 else continue; // electron out of pad-range , lost at the sector edge
1742
1743 Float_t aval = (absy<range-0.5) ? v(idx+4):v(idx+4)*IneffFactor;
1744
1745
1746 Float_t dist = y - (Float_t)(PadNumber-CentralPad)*fTPCParam->GetPadPitchWidth();
a03540ae 1747 for (Int_t i=0;i<7;i++){
b6738b36 1748 PadSignal[i]=fPRF2D->GetPRF(-dist+(i-3)*fTPCParam->GetPadPitchWidth(),xwire)*aval;
a03540ae 1749 PadSignal[i] *= fTPCParam->GetPadCoupling();
1750 }
8c555625 1751
1283eee5 1752 Int_t LeftPad = TMath::Max(0,PadNumber-3);
1753 Int_t RightPad = TMath::Min(np-1,PadNumber+3);
8c555625 1754
1755 Int_t pmin=LeftPad-PadNumber+3; // lower index of the pad_signal vector
1756 Int_t pmax=RightPad-PadNumber+3; // upper index
1757
1283eee5 1758 Float_t z_drift = z*zwidthm1;
8c555625 1759 Float_t z_offset = z_drift-(Int_t)z_drift;
1760 //distance to the centre of nearest time bin (in time bin units)
1283eee5 1761 Int_t FirstBucket = (Int_t)z_drift;
8c555625 1762
1763
1764 // loop over time bins (4 bins is enough - 3 sigma truncated Gaussian)
1765 for (Int_t i2=0;i2<4;i2++){
1766 Int_t TrueTime = FirstBucket+i2; // current time bucket
1767 Float_t dz = (Float_t(i2)+z_offset)*zwidth;
1768 Float_t ampl = fRF->GetRF(dz);
1283eee5 1769 if( (TrueTime>MAXTPCTBK-1) ) break; // beyond the time range
8c555625 1770
1771 IndexRange[2]=TMath::Min(IndexRange[2],TrueTime); // min time
1772 IndexRange[3]=TMath::Max(IndexRange[3],TrueTime); // max time
1773
1774 // loop over pads, from pmin to pmax
1775 for(Int_t i3=pmin;i3<=pmax;i3++){
1776 Int_t TruePad = LeftPad+i3-pmin;
1777 IndexRange[0]=TMath::Min(IndexRange[0],TruePad); // min pad
1778 IndexRange[1]=TMath::Max(IndexRange[1],TruePad); // max pad
1779 signal(TruePad,TrueTime)+=(PadSignal[i3]*ampl); // not converted to charge!!!
1780 total(TruePad,TrueTime)+=(PadSignal[i3]*ampl); // not converted to charge!!!
1781 } // end of pads loop
1782 } // end of time loop
1783 } // end of loop over electrons
1784
1785 return label; // returns track label when finished
1786}
1787
1788//_____________________________________________________________________________
1789void AliTPC::GetList(Float_t label,Int_t np,TMatrix *m,Int_t *IndexRange,
1790 Float_t **pList)
1791{
1792 //----------------------------------------------------------------------
1793 // Updates the list of tracks contributing to digits for a given row
1794 //----------------------------------------------------------------------
1795
1796 //-----------------------------------------------------------------
1797 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
1798 //-----------------------------------------------------------------
1799
1800 TMatrix &signal = *m;
1801
1802 // lop over nonzero digits
1803
1804 for(Int_t it=IndexRange[2];it<IndexRange[3]+1;it++){
1805 for(Int_t ip=IndexRange[0];ip<IndexRange[1]+1;ip++){
1806
1807
1283eee5 1808 Int_t GlobalIndex = it*np+ip; // GlobalIndex starts from 0!
8c555625 1809
1810 if(!pList[GlobalIndex]){
1811
1812 //
1813 // Create new list (6 elements - 3 signals and 3 labels),
1814 // but only if the signal is > 0.
1815 //
1816
1817 if(signal(ip,it)>0.){
1818
1819 pList[GlobalIndex] = new Float_t [6];
1820
1821 // set list to -1
1822
1823 *pList[GlobalIndex] = -1.;
1824 *(pList[GlobalIndex]+1) = -1.;
1825 *(pList[GlobalIndex]+2) = -1.;
1826 *(pList[GlobalIndex]+3) = -1.;
1827 *(pList[GlobalIndex]+4) = -1.;
1828 *(pList[GlobalIndex]+5) = -1.;
1829
1830
1831 *pList[GlobalIndex] = label;
1832 *(pList[GlobalIndex]+3) = signal(ip,it);}
1833 }
1834 else{
1835
1836 // check the signal magnitude
1837
1838 Float_t highest = *(pList[GlobalIndex]+3);
1839 Float_t middle = *(pList[GlobalIndex]+4);
1840 Float_t lowest = *(pList[GlobalIndex]+5);
1841
1842 //
1843 // compare the new signal with already existing list
1844 //
1845
1846 if(signal(ip,it)<lowest) continue; // neglect this track
1847
1848 //
1849
1850 if (signal(ip,it)>highest){
1851 *(pList[GlobalIndex]+5) = middle;
1852 *(pList[GlobalIndex]+4) = highest;
1853 *(pList[GlobalIndex]+3) = signal(ip,it);
1854
1855 *(pList[GlobalIndex]+2) = *(pList[GlobalIndex]+1);
1856 *(pList[GlobalIndex]+1) = *pList[GlobalIndex];
1857 *pList[GlobalIndex] = label;
1858 }
1859 else if (signal(ip,it)>middle){
1860 *(pList[GlobalIndex]+5) = middle;
1861 *(pList[GlobalIndex]+4) = signal(ip,it);
1862
1863 *(pList[GlobalIndex]+2) = *(pList[GlobalIndex]+1);
1864 *(pList[GlobalIndex]+1) = label;
1865 }
1866 else{
1867 *(pList[GlobalIndex]+5) = signal(ip,it);
1868 *(pList[GlobalIndex]+2) = label;
1869 }
1870 }
1871
1872 } // end of loop over pads
1873 } // end of loop over time bins
1874
1875
1876
1877
1878}//end of GetList
1879//___________________________________________________________________
1880void AliTPC::MakeSector(Int_t isec,Int_t nrows,TTree *TH,
1881 Stat_t ntracks,TObjArray **row)
1882{
1883
1884 //-----------------------------------------------------------------
1885 // Prepares the sector digitization, creates the vectors of
1886 // tracks for each row of this sector. The track vector
1887 // contains the track label and the position of electrons.
1888 //-----------------------------------------------------------------
1889
1890 //-----------------------------------------------------------------
1891 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
1892 //-----------------------------------------------------------------
1893
1894 AliTPCParam * fTPCParam = &(fDigParam->GetParam());
1895 Int_t i;
1896 Float_t xyz[3];
1897
1898 AliTPChit *tpcHit; // pointer to a sigle TPC hit
1899
1900 //----------------------------------------------
1901 // Create TObjArray-s, one for each row,
1902 // each TObjArray will store the TVectors
1903 // of electrons, one TVector per each track.
1904 //----------------------------------------------
1905
1906 for(i=0; i<nrows; i++){
1907 row[i] = new TObjArray;
1908 }
1909 Int_t *n_of_electrons = new Int_t [nrows]; // electron counter for each row
1910 TVector **tr = new TVector* [nrows]; //pointers to the track vectors
1911
1912 //--------------------------------------------------------------------
1913 // Loop over tracks, the "track" contains the full history
1914 //--------------------------------------------------------------------
1915
1916 Int_t previousTrack,currentTrack;
1917 previousTrack = -1; // nothing to store so far!
1918
1919 for(Int_t track=0;track<ntracks;track++){
1920
1921 ResetHits();
1922
1923 TH->GetEvent(track); // get next track
1924 Int_t nhits = fHits->GetEntriesFast(); // get number of hits for this track
1925
1926 if(nhits == 0) continue; // no hits in the TPC for this track
1927
1928 //--------------------------------------------------------------
1929 // Loop over hits
1930 //--------------------------------------------------------------
1931
1932 for(Int_t hit=0;hit<nhits;hit++){
1933
1934 tpcHit = (AliTPChit*)fHits->UncheckedAt(hit); // get a pointer to a hit
1935
1936 Int_t sector=tpcHit->fSector; // sector number
1937 if(sector != isec) continue; //terminate iteration
1938
1939 currentTrack = tpcHit->fTrack; // track number
1940 if(currentTrack != previousTrack){
1941
1942 // store already filled fTrack
1943
1944 for(i=0;i<nrows;i++){
1945 if(previousTrack != -1){
1946 if(n_of_electrons[i]>0){
1947 TVector &v = *tr[i];
1948 v(0) = previousTrack;
1949 tr[i]->ResizeTo(3*n_of_electrons[i]+1); // shrink if necessary
1950 row[i]->Add(tr[i]);
1951 }
1952 else{
1953 delete tr[i]; // delete empty TVector
1954 tr[i]=0;
1955 }
1956 }
1957
1958 n_of_electrons[i]=0;
1959 tr[i] = new TVector(361); // TVectors for the next fTrack
1960
1961 } // end of loop over rows
1962
1963 previousTrack=currentTrack; // update track label
1964 }
1965
1966 Int_t QI = (Int_t) (tpcHit->fQ); // energy loss (number of electrons)
1967
1968 //---------------------------------------------------
1969 // Calculate the electron attachment probability
1970 //---------------------------------------------------
1971
1972 Float_t time = 1.e6*(z_end-TMath::Abs(tpcHit->fZ))/fTPCParam->GetDriftV();
1973 // in microseconds!
1974 Float_t AttProb = fTPCParam->GetAttCoef()*
1975 fTPCParam->GetOxyCont()*time; // fraction!
1976
1977 //-----------------------------------------------
1978 // Loop over electrons
1979 //-----------------------------------------------
1980
1981 for(Int_t nel=0;nel<QI;nel++){
1982 // skip if electron lost due to the attachment
1983 if((gRandom->Rndm(0)) < AttProb) continue; // electron lost!
1984 xyz[0]=tpcHit->fX;
1985 xyz[1]=tpcHit->fY;
1986 xyz[2]=tpcHit->fZ;
1987 ElDiff(xyz); // Appply the diffusion
1988 Int_t row_number;
1989 fTPCParam->XYZtoCRXYZ(xyz,isec,row_number,3);
1990
1991 //transform position to local coordinates
1992 //option 3 means that we calculate x position relative to
1993 //nearest pad row
1994
1995 if ((row_number<0)||row_number>=fTPCParam->GetNRow(isec)) continue;
1996 ExB(xyz); // ExB effect at the sense wires
1997 n_of_electrons[row_number]++;
1998 //----------------------------------
1999 // Expand vector if necessary
2000 //----------------------------------
fe4da5cc 2001 if(n_of_electrons[row_number]>120){
2002 Int_t range = tr[row_number]->GetNrows();
8c555625 2003 if(n_of_electrons[row_number] > (range-1)/3){
2004 tr[row_number]->ResizeTo(range+150); // Add 50 electrons
fe4da5cc 2005 }
2006 }
2007
fe4da5cc 2008 TVector &v = *tr[row_number];
8c555625 2009 Int_t idx = 3*n_of_electrons[row_number]-2;
2010
2011 v(idx)= xyz[0]; // X
2012 v(idx+1)=xyz[1]; // Y (along the pad-row)
2013 v(idx+2)=xyz[2]; // Z
2014
2015 } // end of loop over electrons
2016
2017 } // end of loop over hits
2018 } // end of loop over tracks
2019
2020 //
2021 // store remaining track (the last one) if not empty
2022 //
2023
2024 for(i=0;i<nrows;i++){
2025 if(n_of_electrons[i]>0){
2026 TVector &v = *tr[i];
2027 v(0) = previousTrack;
2028 tr[i]->ResizeTo(3*n_of_electrons[i]+1); // shrink if necessary
2029 row[i]->Add(tr[i]);
fe4da5cc 2030 }
2031 else{
8c555625 2032 delete tr[i];
2033 tr[i]=0;
2034 }
2035 }
2036
2037 delete [] tr;
2038 delete [] n_of_electrons;
2039
2040} // end of MakeSector
2041//_____________________________________________________________________________
2042void AliTPC::GetCrossTalk (Int_t iFlag,TObjArray *p,Int_t ntracks,Int_t *npads,
2043 TMatrix *m)
2044{
2045
2046 //-------------------------------------------------------------
2047 // Calculates the cross-talk from one row (inner or outer)
2048 //-------------------------------------------------------------
2049
2050 //-----------------------------------------------------------------
2051 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
2052 //-----------------------------------------------------------------
2053
2054 //
2055 // iFlag=2 & 3 --> cross-talk from the inner row
2056 // iFlag=0 & 4 --> cross-talk from the outer row
2057 //
2058 AliTPCParam * fTPCParam = &(fDigParam->GetParam());
2059 AliTPCPRF2D * fPRF2D = &(fDigParam->GetPRF2D());
2060 AliTPCRF1D * fRF = &(fDigParam->GetRF());
2061
2062 //to make code faster
2063
2064 Float_t zwidth = fTPCParam->GetZWidth();
2065 Float_t zwidthm1 =1/fTPCParam->GetZWidth();
2066
2067 Int_t PadNumber;
2068 Float_t xwire;
2069
2070 Int_t nPadsSignal; // for this pads the signal is calculated
2071 Float_t range; // sense wire range
2072 Int_t nPadsDiff;
2073
2074 Float_t IneffFactor=0.5; // gain inefficiency close to the edges
2075
2076 if(iFlag == 0){
2077 // 1-->0
2078 nPadsSignal = npads[1];
2079 range = ((npads[1]-1)/2 + 0.5)*fTPCParam->GetPadPitchWidth();
2080 nPadsDiff = (npads[1]-npads[0])/2;
2081 }
2082 else if (iFlag == 2){
2083 // 1-->2
2084 nPadsSignal = npads[2];
2085 range = ((npads[1]-1)/2 + 0.5)*fTPCParam->GetPadPitchWidth();
2086 nPadsDiff = 0;
2087 }
2088 else if (iFlag == 3){
2089 // 0-->1
2090 nPadsSignal = npads[1];
2091 range = ((npads[0]-1)/2 + 0.5)*fTPCParam->GetPadPitchWidth();
2092 nPadsDiff = 0;
2093 }
2094 else{
2095 // 2-->1
2096 nPadsSignal = npads[2];
2097 range = ((npads[2]-1)/2 + 0.5)*fTPCParam->GetPadPitchWidth();
2098 nPadsDiff = (npads[2]-npads[1])/2;
2099 }
2100
2101 range-=0.5; // dead zone close to the edges
2102
2103 TVector *tv;
2104 TMatrix &signal = *m;
2105
1283eee5 2106 Int_t CentralPad = (nPadsSignal-1)/2;
8c555625 2107 Float_t PadSignal[7]; // signal from a single electron
2108 // Loop over tracks
2109 for(Int_t nt=0;nt<ntracks;nt++){
2110 tv=(TVector*)p->At(nt); // pointer to a track
2111 TVector &v = *tv;
2112 Int_t nElectrons = (tv->GetNrows()-1)/4;
2113 // Loop over electrons
2114 for(Int_t nel=0; nel<nElectrons; nel++){
2115 Int_t idx=nel*4;
2116 xwire=v(idx+1);
2117
2118 if (iFlag==0) xwire+=fTPCParam->GetPadPitchLength();
2119 if (iFlag==2) xwire-=fTPCParam->GetPadPitchLength();
2120 if (iFlag==3) xwire-=fTPCParam->GetPadPitchLength();
2121 if (iFlag==4) xwire+=fTPCParam->GetPadPitchLength();
2122
2123 // electron acceptance for the cross-talk (only the closest wire)
2124
2125 Float_t dxMax = fTPCParam->GetPadPitchLength()*0.5+fTPCParam->GetWWPitch();
2126 if(TMath::Abs(xwire)>dxMax) continue;
2127
2128 Float_t y = v(idx+2);
2129 Float_t z = v(idx+3);
2130 Float_t absy=TMath::Abs(y);
2131
2132 if(absy < 0.5*fTPCParam->GetPadPitchWidth()){
2133 PadNumber=CentralPad;
2134 }
2135 else if (absy < range){
8022212f 2136 PadNumber=(Int_t) ((absy-0.5*fTPCParam->GetPadPitchWidth())/fTPCParam->GetPadPitchWidth() +1.);
8c555625 2137 PadNumber=(Int_t) (TMath::Sign((Float_t)PadNumber, y)+CentralPad);
2138 }
2139 else continue; // electron out of sense wire range, lost at the sector edge
2140
2141 Float_t aval = (absy<range-0.5) ? v(idx+4):v(idx+4)*IneffFactor;
2142
2143 Float_t dist = y - (Float_t)(PadNumber-CentralPad)*fTPCParam->GetPadPitchWidth();
2144
a03540ae 2145 for (Int_t i=0;i<7;i++){
b6738b36 2146 PadSignal[i]=fPRF2D->GetPRF(-dist+(i-3)*fTPCParam->GetPadPitchWidth(),xwire)*aval;
8c555625 2147
a03540ae 2148 PadSignal[i] *= fTPCParam->GetPadCoupling();
2149 }
8c555625 2150 // real pad range
2151
1283eee5 2152 Int_t LeftPad = TMath::Max(0,PadNumber-3);
2153 Int_t RightPad = TMath::Min(nPadsSignal-1,PadNumber+3);
8c555625 2154
2155 Int_t pmin=LeftPad-PadNumber+3; // lower index of the pad_signal vector
2156 Int_t pmax=RightPad-PadNumber+3; // upper index
2157
2158
1283eee5 2159 Float_t z_drift = z*zwidthm1;
8c555625 2160 Float_t z_offset = z_drift-(Int_t)z_drift;
2161 //distance to the centre of nearest time bin (in time bin units)
1283eee5 2162 Int_t FirstBucket = (Int_t)z_drift;
8c555625 2163 // MI check it --time offset
2164 for (Int_t i2=0;i2<4;i2++){
2165 Int_t TrueTime = FirstBucket+i2; // current time bucket
2166 Float_t dz = (Float_t(i2)+z_offset)*zwidth;
2167 Float_t ampl = fRF->GetRF(dz);
1283eee5 2168 if((TrueTime>MAXTPCTBK-1)) break; // beyond the time range
8c555625 2169
2170
2171 // loop over pads, from pmin to pmax
2172
2173 for(Int_t i3=pmin;i3<pmax+1;i3++){
2174 Int_t TruePad = LeftPad+i3-pmin;
2175
1283eee5 2176 if(TruePad<nPadsDiff || TruePad > nPadsSignal-nPadsDiff-1) continue;
8c555625 2177
2178 TruePad -= nPadsDiff;
2179 signal(TruePad,TrueTime)+=(PadSignal[i3]*ampl); // not converted to charge!
2180
2181 } // end of loop over pads
2182 } // end of loop over time bins
2183
2184 } // end of loop over electrons
2185
2186 } // end of loop over tracks
2187
2188} // end of GetCrossTalk
2189
2190
fe4da5cc 2191
2192//_____________________________________________________________________________
2193void AliTPC::Init()
2194{
2195 //
2196 // Initialise TPC detector after definition of geometry
2197 //
2198 Int_t i;
2199 //
2200 printf("\n");
2201 for(i=0;i<35;i++) printf("*");
2202 printf(" TPC_INIT ");
2203 for(i=0;i<35;i++) printf("*");
2204 printf("\n");
2205 //
2206 for(i=0;i<80;i++) printf("*");
2207 printf("\n");
2208}
2209
2210//_____________________________________________________________________________
2211void AliTPC::MakeBranch(Option_t* option)
2212{
2213 //
2214 // Create Tree branches for the TPC.
2215 //
2216 Int_t buffersize = 4000;
2217 char branchname[10];
2218 sprintf(branchname,"%s",GetName());
2219
2220 AliDetector::MakeBranch(option);
2221
2222 char *D = strstr(option,"D");
2223
2224 if (fDigits && gAlice->TreeD() && D) {
2225 gAlice->TreeD()->Branch(branchname,&fDigits, buffersize);
2226 printf("Making Branch %s for digits\n",branchname);
2227 }
2228
2229 char *R = strstr(option,"R");
2230
2231 if (fClusters && gAlice->TreeR() && R) {
2232 gAlice->TreeR()->Branch(branchname,&fClusters, buffersize);
2233 printf("Making Branch %s for Clusters\n",branchname);
2234 }
2235}
2236
2237//_____________________________________________________________________________
2238void AliTPC::ResetDigits()
2239{
2240 //
2241 // Reset number of digits and the digits array for this detector
2242 // reset clusters
2243 //
2244 fNdigits = 0;
8c555625 2245 // if (fDigits) fDigits->Clear();
2246 if (fDigParam->GetArray()!=0) fDigParam->GetArray()->Clear();
fe4da5cc 2247 fNclusters = 0;
2248 if (fClusters) fClusters->Clear();
2249}
2250
2251//_____________________________________________________________________________
2252void AliTPC::SetSecAL(Int_t sec)
2253{
8c555625 2254 //---------------------------------------------------
fe4da5cc 2255 // Activate/deactivate selection for lower sectors
8c555625 2256 //---------------------------------------------------
2257
2258 //-----------------------------------------------------------------
2259 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
2260 //-----------------------------------------------------------------
2261
fe4da5cc 2262 fSecAL = sec;
2263}
2264
2265//_____________________________________________________________________________
2266void AliTPC::SetSecAU(Int_t sec)
2267{
8c555625 2268 //----------------------------------------------------
fe4da5cc 2269 // Activate/deactivate selection for upper sectors
8c555625 2270 //---------------------------------------------------
2271
2272 //-----------------------------------------------------------------
2273 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
2274 //-----------------------------------------------------------------
2275
fe4da5cc 2276 fSecAU = sec;
2277}
2278
2279//_____________________________________________________________________________
2280void AliTPC::SetSecLows(Int_t s1,Int_t s2,Int_t s3,Int_t s4,Int_t s5, Int_t s6)
2281{
8c555625 2282 //----------------------------------------
fe4da5cc 2283 // Select active lower sectors
8c555625 2284 //----------------------------------------
2285
2286 //-----------------------------------------------------------------
2287 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
2288 //-----------------------------------------------------------------
2289
fe4da5cc 2290 fSecLows[0] = s1;
2291 fSecLows[1] = s2;
2292 fSecLows[2] = s3;
2293 fSecLows[3] = s4;
2294 fSecLows[4] = s5;
2295 fSecLows[5] = s6;
2296}
2297
2298//_____________________________________________________________________________
2299void AliTPC::SetSecUps(Int_t s1,Int_t s2,Int_t s3,Int_t s4,Int_t s5, Int_t s6,
2300 Int_t s7, Int_t s8 ,Int_t s9 ,Int_t s10,
2301 Int_t s11 , Int_t s12)
2302{
8c555625 2303 //--------------------------------
fe4da5cc 2304 // Select active upper sectors
8c555625 2305 //--------------------------------
2306
2307 //-----------------------------------------------------------------
2308 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
2309 //-----------------------------------------------------------------
2310
fe4da5cc 2311 fSecUps[0] = s1;
2312 fSecUps[1] = s2;
2313 fSecUps[2] = s3;
2314 fSecUps[3] = s4;
2315 fSecUps[4] = s5;
2316 fSecUps[5] = s6;
2317 fSecUps[6] = s7;
2318 fSecUps[7] = s8;
2319 fSecUps[8] = s9;
2320 fSecUps[9] = s10;
2321 fSecUps[10] = s11;
2322 fSecUps[11] = s12;
2323}
2324
2325//_____________________________________________________________________________
2326void AliTPC::SetSens(Int_t sens)
2327{
8c555625 2328
2329 //-------------------------------------------------------------
2330 // Activates/deactivates the sensitive strips at the center of
2331 // the pad row -- this is for the space-point resolution calculations
2332 //-------------------------------------------------------------
2333
2334 //-----------------------------------------------------------------
2335 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
2336 //-----------------------------------------------------------------
2337
fe4da5cc 2338 fSens = sens;
2339}
4b0fdcad 2340
2341void AliTPC::SetSide(Float_t side)
2342{
2343 fSide = side;
2344
2345}
1283eee5 2346//____________________________________________________________________________
2347void AliTPC::SetGasMixt(Int_t nc,Int_t c1,Int_t c2,Int_t c3,Float_t p1,
2348 Float_t p2,Float_t p3)
2349{
fe4da5cc 2350
1283eee5 2351 fNoComp = nc;
2352
2353 fMixtComp[0]=c1;
2354 fMixtComp[1]=c2;
2355 fMixtComp[2]=c3;
2356
2357 fMixtProp[0]=p1;
2358 fMixtProp[1]=p2;
2359 fMixtProp[2]=p3;
2360
2361
2362}
fe4da5cc 2363//_____________________________________________________________________________
2364void AliTPC::Streamer(TBuffer &R__b)
2365{
2366 //
2367 // Stream an object of class AliTPC.
2368 //
2369 if (R__b.IsReading()) {
2370 Version_t R__v = R__b.ReadVersion(); if (R__v) { }
2371 AliDetector::Streamer(R__b);
2372 if (R__v < 2) return;
2373 R__b >> fNsectors;
2374 R__b >> fNclusters;
2375 R__b >> fNtracks;
2376 fClustersIndex = new Int_t[fNsectors+1];
2377 fDigitsIndex = new Int_t[fNsectors+1];
2378 } else {
2379 R__b.WriteVersion(AliTPC::IsA());
2380 AliDetector::Streamer(R__b);
2381 R__b << fNsectors;
2382 R__b << fNclusters;
2383 R__b << fNtracks;
2384 }
2385}
2386
2387ClassImp(AliTPCcluster)
2388
2389//_____________________________________________________________________________
2390AliTPCcluster::AliTPCcluster(Float_t *hits, Int_t *lab)
2391{
2392 //
2393 // Creates a simulated cluster for the TPC
2394 //
2395 fTracks[0] = lab[0];
2396 fTracks[1] = lab[1];
2397 fTracks[2] = lab[2];
2398 fSector = lab[3];
2399 fPadRow = lab[4];
2400 fY = hits[0];
2401 fZ = hits[1];
2402 fQ = hits[2];
2403 fSigmaY2 = hits[3];
2404 fSigmaZ2 = hits[4];
2405}
2406
2407//_____________________________________________________________________________
8c555625 2408void AliTPCcluster::GetXYZ(Float_t *x, const AliTPCParam *par) const
fe4da5cc 2409{
2410 //
8c555625 2411 // Transformation from local to global coordinate system
fe4da5cc 2412 //
8c555625 2413 x[0]=par->GetPadRowRadii(fSector,fPadRow-1);
2414 x[1]=fY;
2415 x[2]=fZ;
2416 par->CRXYZtoXYZ(x,fSector,fPadRow-1,1);
fe4da5cc 2417}
2418
8c555625 2419//_____________________________________________________________________________
2420Int_t AliTPCcluster::Compare(TObject * o)
2421{
2422 //
2423 // compare two clusters according y coordinata
2424 AliTPCcluster *cl= (AliTPCcluster *)o;
2425 if (fY<cl->fY) return -1;
2426 if (fY==cl->fY) return 0;
2427 return 1;
2428}
2429
2430Bool_t AliTPCcluster::IsSortable() const
2431{
2432 //
2433 //make AliTPCcluster sortabale
2434 return kTRUE;
2435}
2436
2437
2438
fe4da5cc 2439ClassImp(AliTPCdigit)
2440
2441//_____________________________________________________________________________
2442AliTPCdigit::AliTPCdigit(Int_t *tracks, Int_t *digits):
2443 AliDigit(tracks)
2444{
2445 //
2446 // Creates a TPC digit object
2447 //
2448 fSector = digits[0];
2449 fPadRow = digits[1];
2450 fPad = digits[2];
2451 fTime = digits[3];
2452 fSignal = digits[4];
2453}
2454
2455
2456ClassImp(AliTPChit)
2457
2458//_____________________________________________________________________________
2459AliTPChit::AliTPChit(Int_t shunt, Int_t track, Int_t *vol, Float_t *hits):
2460AliHit(shunt,track)
2461{
2462 //
2463 // Creates a TPC hit object
2464 //
2465 fSector = vol[0];
2466 fPadRow = vol[1];
2467 fX = hits[0];
2468 fY = hits[1];
2469 fZ = hits[2];
2470 fQ = hits[3];
2471}
2472
2473
2474ClassImp(AliTPCtrack)
2475
2476//_____________________________________________________________________________
2477AliTPCtrack::AliTPCtrack(Float_t *hits)
2478{
2479 //
2480 // Default creator for a TPC reconstructed track object
2481 //
2482 ref=hits[0]; // This is dummy code !
2483}
2484
2485AliTPCtrack::AliTPCtrack(const AliTPCcluster& c,const TVector& xx,
8c555625 2486 const TMatrix& CC, const AliTPCParam *p):
fe4da5cc 2487 x(xx),C(CC),clusters(MAX_CLUSTER)
2488{
2489 //
2490 // Standard creator for a TPC reconstructed track object
2491 //
2492 chi2=0.;
8c555625 2493 int sec=c.fSector-1, row=c.fPadRow-1;
2494 ref=p->GetPadRowRadii(sec+1,row);
2495
fe4da5cc 2496 if (sec<24) {
8c555625 2497 fAlpha=(sec%12)*alpha_low;
fe4da5cc 2498 } else {
8c555625 2499 fAlpha=(sec%24)*alpha_up;
fe4da5cc 2500 }
2501 clusters.AddLast((AliTPCcluster*)(&c));
2502}
2503
2504//_____________________________________________________________________________
2505AliTPCtrack::AliTPCtrack(const AliTPCtrack& t) : x(t.x), C(t.C),
2506 clusters(t.clusters.GetEntriesFast())
2507{
2508 //
2509 // Copy creator for a TPC reconstructed track
2510 //
2511 ref=t.ref;
2512 chi2=t.chi2;
2513 fAlpha=t.fAlpha;
2514 int n=t.clusters.GetEntriesFast();
2515 for (int i=0; i<n; i++) clusters.AddLast(t.clusters.UncheckedAt(i));
2516}
2517
2518//_____________________________________________________________________________
2519Double_t AliTPCtrack::GetY(Double_t xk) const
2520{
2521 //
2522 //
2523 //
2524 Double_t c2=x(2)*xk - x(3);
2525 if (TMath::Abs(c2) >= 0.999) {
2526 if (*this>10) cerr<<*this<<" AliTPCtrack warning: No y for this x !\n";
2527 return 0.;
2528 }
2529 Double_t c1=x(2)*ref - x(3);
2530 Double_t r1=sqrt(1.-c1*c1), r2=sqrt(1.-c2*c2);
2531 Double_t dx=xk-ref;
2532 return x(0) + dx*(c1+c2)/(r1+r2);
2533}
2534
2535//_____________________________________________________________________________
2536int AliTPCtrack::PropagateTo(Double_t xk,Double_t x0,Double_t rho,Double_t pm)
2537{
2538 //
2539 // Propagate a TPC reconstructed track
2540 //
2541 if (TMath::Abs(x(2)*xk - x(3)) >= 0.999) {
2542 if (*this>3) cerr<<*this<<" AliTPCtrack warning: Propagation failed !\n";
2543 return 0;
2544 }
8c555625 2545
fe4da5cc 2546 Double_t x1=ref, x2=x1+0.5*(xk-x1), dx=x2-x1, y1=x(0), z1=x(1);
2547 Double_t c1=x(2)*x1 - x(3), r1=sqrt(1.- c1*c1);
2548 Double_t c2=x(2)*x2 - x(3), r2=sqrt(1.- c2*c2);
2549
2550 x(0) += dx*(c1+c2)/(r1+r2);
2551 x(1) += dx*(c1+c2)/(c1*r2 + c2*r1)*x(4);
8c555625 2552
fe4da5cc 2553 TMatrix F(5,5); F.UnitMatrix();
2554 Double_t rr=r1+r2, cc=c1+c2, xx=x1+x2;
2555 F(0,2)= dx*(rr*xx + cc*(c1*x1/r1+c2*x2/r2))/(rr*rr);
2556 F(0,3)=-dx*(2*rr + cc*(c1/r1 + c2/r2))/(rr*rr);
2557 Double_t cr=c1*r2+c2*r1;
2558 F(1,2)= dx*x(4)*(cr*xx-cc*(r1*x2-c2*c1*x1/r1+r2*x1-c1*c2*x2/r2))/(cr*cr);
2559 F(1,3)=-dx*x(4)*(2*cr + cc*(c2*c1/r1-r1 + c1*c2/r2-r2))/(cr*cr);
2560 F(1,4)= dx*cc/cr;
2561 TMatrix tmp(F,TMatrix::kMult,C);
2562 C.Mult(tmp,TMatrix(TMatrix::kTransposed,F));
2563
2564 ref=x2;
2565
2566 //Multiple scattering******************
2567 Double_t ey=x(2)*ref - x(3);
2568 Double_t ex=sqrt(1-ey*ey);
2569 Double_t ez=x(4);
2570 TMatrix Q(5,5); Q=0.;
2571 Q(2,2)=ez*ez+ey*ey; Q(2,3)=-ex*ey; Q(2,4)=-ex*ez;
2572 Q(3,2)=Q(2,3); Q(3,3)= ez*ez+ex*ex; Q(3,4)=-ey*ez;
2573 Q(4,2)=Q(2,4); Q(4,3)= Q(3,4); Q(4,4)=1.;
2574
2575 F=0;
2576 F(2,2)=-x(2)*ex; F(2,3)=-x(2)*ey;
2577 F(3,2)=-ex*(x(2)*ref-ey); F(3,3)=-(1.+ x(2)*ref*ey - ey*ey);
2578 F(4,2)=-ez*ex; F(4,3)=-ez*ey; F(4,4)=1.;
2579
2580 tmp.Mult(F,Q);
2581 Q.Mult(tmp,TMatrix(TMatrix::kTransposed,F));
2582
2583 Double_t p2=GetPt()*GetPt()*(1.+x(4)*x(4));
2584 Double_t beta2=p2/(p2 + pm*pm);
2585 Double_t d=sqrt((x1-ref)*(x1-ref)+(y1-x(0))*(y1-x(0))+(z1-x(1))*(z1-x(1)));
2586 d*=2.;
2587 Double_t theta2=14.1*14.1/(beta2*p2*1e6)*d/x0*rho;
2588 Q*=theta2;
2589 C+=Q;
2590
2591 //Energy losses************************
2592 Double_t dE=0.153e-3/beta2*(log(5940*beta2/(1-beta2)) - beta2)*d*rho;
2593 if (x1 < x2) dE=-dE;
2594 x(2)*=(1.- sqrt(p2+pm*pm)/p2*dE);
8c555625 2595 //x(3)*=(1.- sqrt(p2+pm*pm)/p2*dE);
fe4da5cc 2596
2597 x1=ref; x2=xk; y1=x(0); z1=x(1);
2598 c1=x(2)*x1 - x(3); r1=sqrt(1.- c1*c1);
2599 c2=x(2)*x2 - x(3); r2=sqrt(1.- c2*c2);
2600
2601 x(0) += dx*(c1+c2)/(r1+r2);
2602 x(1) += dx*(c1+c2)/(c1*r2 + c2*r1)*x(4);
2603
2604 F.UnitMatrix();
2605 rr=r1+r2; cc=c1+c2; xx=x1+x2;
2606 F(0,2)= dx*(rr*xx + cc*(c1*x1/r1+c2*x2/r2))/(rr*rr);
2607 F(0,3)=-dx*(2*rr + cc*(c1/r1 + c2/r2))/(rr*rr);
2608 cr=c1*r2+c2*r1;
2609 F(1,2)= dx*x(4)*(cr*xx-cc*(r1*x2-c2*c1*x1/r1+r2*x1-c1*c2*x2/r2))/(cr*cr);
2610 F(1,3)=-dx*x(4)*(2*cr + cc*(c2*c1/r1-r1 + c1*c2/r2-r2))/(cr*cr);
2611 F(1,4)= dx*cc/cr;
2612 tmp.Mult(F,C);
2613 C.Mult(tmp,TMatrix(TMatrix::kTransposed,F));
2614
2615 ref=x2;
2616
2617 return 1;
2618}
2619
2620//_____________________________________________________________________________
2621void AliTPCtrack::PropagateToVertex(Double_t x0,Double_t rho,Double_t pm)
2622{
2623 //
2624 // Propagate a reconstructed track from the vertex
2625 //
2626 Double_t c=x(2)*ref - x(3);
2627 Double_t tgf=-x(3)/(x(2)*x(0) + sqrt(1-c*c));
2628 Double_t snf=tgf/sqrt(1.+ tgf*tgf);
2629 Double_t xv=(x(3)+snf)/x(2);
2630 PropagateTo(xv,x0,rho,pm);
2631}
2632
2633//_____________________________________________________________________________
2634void AliTPCtrack::Update(const AliTPCcluster *c, Double_t chisq)
2635{
2636 //
2637 // Update statistics for a reconstructed TPC track
2638 //
2639 TMatrix H(2,5); H.UnitMatrix();
2640 TMatrix Ht(TMatrix::kTransposed,H);
2641 TVector m(2); m(0)=c->fY; m(1)=c->fZ;
2642 TMatrix V(2,2); V(0,0)=c->fSigmaY2; V(0,1)=0.; V(1,0)=0.; V(1,1)=c->fSigmaZ2;
2643
2644 TMatrix tmp(H,TMatrix::kMult,C);
2645 TMatrix R(tmp,TMatrix::kMult,Ht); R+=V;
2646
2647 Double_t det=(Double_t)R(0,0)*R(1,1) - (Double_t)R(0,1)*R(1,0);
2648 R(0,1)=R(0,0); R(0,0)=R(1,1); R(1,1)=R(0,1);
2649 R(1,0)*=-1; R(0,1)=R(1,0);
2650 R*=1./det;
2651
2652 //R.Invert();
2653
2654 TMatrix K(C,TMatrix::kMult,Ht); K*=R;
2655
2656 TVector savex=x;
2657 x*=H; x-=m; x*=-1; x*=K; x+=savex;
2658 if (TMath::Abs(x(2)*ref-x(3)) >= 0.999) {
2659 if (*this>3) cerr<<*this<<" AliTPCtrack warning: Filtering failed !\n";
2660 x=savex;
2661 return;
2662 }
2663
2664 TMatrix saveC=C;
2665 C.Mult(K,tmp); C-=saveC; C*=-1;
2666
2667 clusters.AddLast((AliTPCcluster*)c);
2668 chi2 += chisq;
2669}
2670
2671//_____________________________________________________________________________
2672int AliTPCtrack::Rotate(Double_t alpha)
2673{
2674 //
2675 // Rotate a reconstructed TPC track
2676 //
2677 fAlpha += alpha;
2678
2679 Double_t x1=ref, y1=x(0);
2680 Double_t ca=cos(alpha), sa=sin(alpha);
2681 Double_t r1=x(2)*ref - x(3);
2682
2683 ref = x1*ca + y1*sa;
2684 x(0)=-x1*sa + y1*ca;
2685 x(3)=x(3)*ca + (x(2)*y1 + sqrt(1.- r1*r1))*sa;
2686
2687 Double_t r2=x(2)*ref - x(3);
2688 if (TMath::Abs(r2) >= 0.999) {
2689 if (*this>3) cerr<<*this<<" AliTPCtrack warning: Rotation failed !\n";
2690 return 0;
2691 }
2692
2693 Double_t y0=x(0) + sqrt(1.- r2*r2)/x(2);
2694 if ((x(0)-y0)*x(2) >= 0.) {
2695 if (*this>3) cerr<<*this<<" AliTPCtrack warning: Rotation failed !!!\n";
2696 return 0;
2697 }
2698
2699 TMatrix F(5,5); F.UnitMatrix();
2700 F(0,0)=ca;
2701 F(3,0)=x(2)*sa;
2702 F(3,2)=(y1 - r1*x1/sqrt(1.- r1*r1))*sa;
2703 F(3,3)= ca + sa*r1/sqrt(1.- r1*r1);
2704 TMatrix tmp(F,TMatrix::kMult,C);
2705 // Double_t dy2=C(0,0);
2706 C.Mult(tmp,TMatrix(TMatrix::kTransposed,F));
2707 // C(0,0)+=dy2*sa*sa*r1*r1/(1.- r1*r1);
2708 // C(1,1)+=dy2*sa*sa*x(4)*x(4)/(1.- r1*r1);
2709
2710 return 1;
2711}
2712
2713//_____________________________________________________________________________
2714void AliTPCtrack::UseClusters() const
2715{
2716 //
2717 //
2718 //
2719 int num_of_clusters=clusters.GetEntriesFast();
2720 for (int i=0; i<num_of_clusters; i++) {
2721 //if (i<=14) continue;
2722 AliTPCcluster *c=(AliTPCcluster*)clusters.UncheckedAt(i);
2723 c->Use();
2724 }
2725}
2726
2727//_____________________________________________________________________________
2728Double_t AliTPCtrack::GetPredictedChi2(const AliTPCcluster *c) const
2729{
2730 //
2731 // Calculate chi2 for a reconstructed TPC track
2732 //
2733 TMatrix H(2,5); H.UnitMatrix();
2734 TVector m(2); m(0)=c->fY; m(1)=c->fZ;
2735 TMatrix V(2,2); V(0,0)=c->fSigmaY2; V(0,1)=0.; V(1,0)=0.; V(1,1)=c->fSigmaZ2;
2736 TVector res=x; res*=H; res-=m; //res*=-1;
2737 TMatrix tmp(H,TMatrix::kMult,C);
2738 TMatrix R(tmp,TMatrix::kMult,TMatrix(TMatrix::kTransposed,H)); R+=V;
2739
2740 Double_t det=(Double_t)R(0,0)*R(1,1) - (Double_t)R(0,1)*R(1,0);
2741 if (TMath::Abs(det) < 1.e-10) {
2742 if (*this>3) cerr<<*this<<" AliTPCtrack warning: Singular matrix !\n";
2743 return 1e10;
2744 }
2745 R(0,1)=R(0,0); R(0,0)=R(1,1); R(1,1)=R(0,1);
2746 R(1,0)*=-1; R(0,1)=R(1,0);
2747 R*=1./det;
2748
2749 //R.Invert();
2750
2751 TVector r=res;
2752 res*=R;
2753 return r*res;
2754}
2755
2756//_____________________________________________________________________________
2757int AliTPCtrack::GetLab() const
2758{
2759 //
2760 //
2761 //
7ee081c2 2762 int lab=123456789;
fe4da5cc 2763 struct {
2764 int lab;
2765 int max;
2766 } s[MAX_CLUSTER]={{0,0}};
2767
2768 int i;
2769 int num_of_clusters=clusters.GetEntriesFast();
2770 for (i=0; i<num_of_clusters; i++) {
2771 AliTPCcluster *c=(AliTPCcluster*)clusters.UncheckedAt(i);
8c555625 2772 lab=TMath::Abs(c->fTracks[0]);
fe4da5cc 2773 int j;
2774 for (j=0; j<MAX_CLUSTER; j++)
2775 if (s[j].lab==lab || s[j].max==0) break;
2776 s[j].lab=lab;
2777 s[j].max++;
2778 }
2779
2780 int max=0;
2781 for (i=0; i<num_of_clusters; i++)
2782 if (s[i].max>max) {max=s[i].max; lab=s[i].lab;}
8c555625 2783
2784 for (i=0; i<num_of_clusters; i++) {
2785 AliTPCcluster *c=(AliTPCcluster*)clusters.UncheckedAt(i);
2786 if (TMath::Abs(c->fTracks[1]) == lab ||
2787 TMath::Abs(c->fTracks[2]) == lab ) max++;
2788 }
fe4da5cc 2789
2790 if (1.-float(max)/num_of_clusters > 0.10) return -lab;
2791
2792 if (num_of_clusters < 6) return lab;
2793
2794 max=0;
2795 for (i=1; i<=6; i++) {
2796 AliTPCcluster *c=(AliTPCcluster*)clusters.UncheckedAt(num_of_clusters-i);
8c555625 2797 if (lab == TMath::Abs(c->fTracks[0]) ||
2798 lab == TMath::Abs(c->fTracks[1]) ||
2799 lab == TMath::Abs(c->fTracks[2])) max++;
fe4da5cc 2800 }
8c555625 2801 if (max<3) return -lab;
fe4da5cc 2802
2803 return lab;
2804}
2805
2806//_____________________________________________________________________________
2807void AliTPCtrack::GetPxPyPz(Double_t& px, Double_t& py, Double_t& pz) const
2808{
2809 //
2810 // Get reconstructed TPC track momentum
2811 //
2812 Double_t pt=0.3*FIELD/TMath::Abs(x(2))/100; // GeV/c
2813 Double_t r=x(2)*ref-x(3);
2814 Double_t y0=x(0) + sqrt(1.- r*r)/x(2);
2815 px=-pt*(x(0)-y0)*x(2); //cos(phi);
2816 py=-pt*(x(3)-ref*x(2)); //sin(phi);
2817 pz=pt*x(4);
2818 Double_t tmp=px*TMath::Cos(fAlpha) - py*TMath::Sin(fAlpha);
2819 py=px*TMath::Sin(fAlpha) + py*TMath::Cos(fAlpha);
2820 px=tmp;
2821}
2822
2823//_____________________________________________________________________________
2824//
2825// Classes for internal tracking use
2826//
2827
2828//_____________________________________________________________________________
2829void AliTPCRow::InsertCluster(const AliTPCcluster* c)
2830{
2831 //
2832 // Insert a cluster in the list
2833 //
2834 if (num_of_clusters==MAX_CLUSTER_PER_ROW) {
2835 cerr<<"AliTPCRow::InsertCluster(): Too many clusters !\n"; return;
2836 }
2837 if (num_of_clusters==0) {clusters[num_of_clusters++]=c; return;}
2838 int i=Find(c->fY);
2839 memmove(clusters+i+1 ,clusters+i,(num_of_clusters-i)*sizeof(AliTPCcluster*));
2840 clusters[i]=c; num_of_clusters++;
2841}
2842
2843//_____________________________________________________________________________
2844int AliTPCRow::Find(Double_t y) const
2845{
2846 //
2847 //
2848 //
2849 if (y <= clusters[0]->fY) return 0;
2850 if (y > clusters[num_of_clusters-1]->fY) return num_of_clusters;
2851 int b=0, e=num_of_clusters-1, m=(b+e)/2;
2852 for (; b<e; m=(b+e)/2) {
2853 if (y > clusters[m]->fY) b=m+1;
2854 else e=m;
2855 }
2856 return m;
2857}
8c555625 2858