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Small bug fixes to TPC files
[u/mrichter/AliRoot.git] / TPC / AliTPC.cxx
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4c039060 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
15
16/*
17$Log$
4d68a14a 18Revision 1.18 2000/04/17 09:37:33 kowal2
19removed obsolete AliTPCDigitsDisplay.C
20
cc80f89e 21Revision 1.17.2.2 2000/04/10 08:15:12 kowal2
22
23New, experimental data structure from M. Ivanov
24New tracking algorithm
25Different pad geometry for different sectors
26Digitization rewritten
27
28Revision 1.17.2.1 2000/04/10 07:56:53 kowal2
29Not used anymore - removed
30
31Revision 1.17 2000/01/19 17:17:30 fca
32Introducing a list of lists of hits -- more hits allowed for detector now
33
1cedd08a 34Revision 1.16 1999/11/05 09:29:23 fca
35Accept only signals > 0
36
921bf71a 37Revision 1.15 1999/10/08 06:26:53 fca
38Removed ClustersIndex - not used anymore
39
e674b993 40Revision 1.14 1999/09/29 09:24:33 fca
41Introduction of the Copyright and cvs Log
42
4c039060 43*/
44
fe4da5cc 45///////////////////////////////////////////////////////////////////////////////
46// //
47// Time Projection Chamber //
48// This class contains the basic functions for the Time Projection Chamber //
49// detector. Functions specific to one particular geometry are //
50// contained in the derived classes //
51// //
52//Begin_Html
53/*
1439f98e 54<img src="picts/AliTPCClass.gif">
fe4da5cc 55*/
56//End_Html
57// //
8c555625 58// //
fe4da5cc 59///////////////////////////////////////////////////////////////////////////////
60
61#include <TMath.h>
62#include <TRandom.h>
63#include <TVector.h>
8c555625 64#include <TMatrix.h>
fe4da5cc 65#include <TGeometry.h>
66#include <TNode.h>
67#include <TTUBS.h>
68#include <TObjectTable.h>
1578254f 69#include "TParticle.h"
fe4da5cc 70#include "AliTPC.h"
71#include "AliRun.h"
72#include <iostream.h>
73#include <fstream.h>
74#include "AliMC.h"
75
cc80f89e 76
8c555625 77#include "AliTPCParam.h"
8c555625 78#include "AliTPCPRF2D.h"
79#include "AliTPCRF1D.h"
cc80f89e 80#include "AliDigits.h"
81#include "AliSimDigits.h"
82
83#include "AliTPCDigitsArray.h"
84#include "AliCluster.h"
85#include "AliClusters.h"
86#include "AliTPCClustersRow.h"
87#include "AliTPCClustersArray.h"
8c555625 88
89
1283eee5 90
fe4da5cc 91ClassImp(AliTPC)
92
93//_____________________________________________________________________________
94AliTPC::AliTPC()
95{
96 //
97 // Default constructor
98 //
99 fIshunt = 0;
100 fClusters = 0;
101 fHits = 0;
102 fDigits = 0;
103 fTracks = 0;
104 fNsectors = 0;
105 fNtracks = 0;
106 fNclusters= 0;
cc80f89e 107 //MI changes
108 fDigitsArray = 0;
109 fClustersArray = 0;
110 fTPCParam = 0;
fe4da5cc 111}
112
113//_____________________________________________________________________________
114AliTPC::AliTPC(const char *name, const char *title)
115 : AliDetector(name,title)
116{
117 //
118 // Standard constructor
119 //
120
121 //
122 // Initialise arrays of hits and digits
123 fHits = new TClonesArray("AliTPChit", 176);
4d68a14a 124 gAlice->AddHitList(fHits);
cc80f89e 125 //MI change
126 fDigitsArray = 0;
127 fClustersArray= 0;
128 fTPCParam = 0;
fe4da5cc 129 //
130 // Initialise counters
131 fClusters = 0;
132 fTracks = 0;
cc80f89e 133 fNsectors = 0;
fe4da5cc 134 fNtracks = 0;
135 fNclusters= 0;
cc80f89e 136
fe4da5cc 137 //
138 fIshunt = 0;
139 //
140 // Initialise color attributes
141 SetMarkerColor(kYellow);
142}
143
144//_____________________________________________________________________________
145AliTPC::~AliTPC()
146{
147 //
148 // TPC destructor
149 //
150 fIshunt = 0;
151 delete fHits;
152 delete fDigits;
153 delete fClusters;
154 delete fTracks;
cc80f89e 155 if (fDigitsArray!=0) delete fDigitsArray;
156 if (fClustersArray!=0) delete fClustersArray;
157
158 if (fTPCParam) delete fTPCParam;
fe4da5cc 159}
160
161//_____________________________________________________________________________
162void AliTPC::AddCluster(Float_t *hits, Int_t *tracks)
163{
164 //
165 // Add a simulated cluster to the list
166 //
167 if(!fClusters) fClusters=new TClonesArray("AliTPCcluster",10000);
168 TClonesArray &lclusters = *fClusters;
169 new(lclusters[fNclusters++]) AliTPCcluster(hits,tracks);
170}
171
172//_____________________________________________________________________________
173void AliTPC::AddCluster(const AliTPCcluster &c)
174{
175 //
176 // Add a simulated cluster copy to the list
177 //
cc80f89e 178 if(!fClusters) fClusters=new TClonesArray("AliTPCcluster",900000);
fe4da5cc 179 TClonesArray &lclusters = *fClusters;
180 new(lclusters[fNclusters++]) AliTPCcluster(c);
181}
182
fe4da5cc 183//_____________________________________________________________________________
184void AliTPC::AddHit(Int_t track, Int_t *vol, Float_t *hits)
185{
186 //
187 // Add a hit to the list
188 //
189 TClonesArray &lhits = *fHits;
190 new(lhits[fNhits++]) AliTPChit(fIshunt,track,vol,hits);
191}
192
193//_____________________________________________________________________________
194void AliTPC::AddTrack(Float_t *hits)
195{
196 //
197 // Add a track to the list of tracks
198 //
199 TClonesArray &ltracks = *fTracks;
200 new(ltracks[fNtracks++]) AliTPCtrack(hits);
201}
202
203//_____________________________________________________________________________
204void AliTPC::AddTrack(const AliTPCtrack& t)
205{
206 //
207 // Add a track copy to the list of tracks
208 //
209 if(!fTracks) fTracks=new TClonesArray("AliTPCtrack",10000);
210 TClonesArray &ltracks = *fTracks;
211 new(ltracks[fNtracks++]) AliTPCtrack(t);
212}
213
214//_____________________________________________________________________________
215void AliTPC::BuildGeometry()
216{
cc80f89e 217
fe4da5cc 218 //
219 // Build TPC ROOT TNode geometry for the event display
220 //
221 TNode *Node, *Top;
222 TTUBS *tubs;
223 Int_t i;
224 const int kColorTPC=19;
1283eee5 225 char name[5], title[25];
fe4da5cc 226 const Double_t kDegrad=TMath::Pi()/180;
1283eee5 227 const Double_t kRaddeg=180./TMath::Pi();
228
1283eee5 229
230 Float_t InnerOpenAngle = fTPCParam->GetInnerAngle();
231 Float_t OuterOpenAngle = fTPCParam->GetOuterAngle();
232
233 Float_t InnerAngleShift = fTPCParam->GetInnerAngleShift();
234 Float_t OuterAngleShift = fTPCParam->GetOuterAngleShift();
235
236 Int_t nLo = fTPCParam->GetNInnerSector()/2;
237 Int_t nHi = fTPCParam->GetNOuterSector()/2;
238
239 const Double_t loAng = (Double_t)TMath::Nint(InnerOpenAngle*kRaddeg);
240 const Double_t hiAng = (Double_t)TMath::Nint(OuterOpenAngle*kRaddeg);
241 const Double_t loAngSh = (Double_t)TMath::Nint(InnerAngleShift*kRaddeg);
242 const Double_t hiAngSh = (Double_t)TMath::Nint(OuterAngleShift*kRaddeg);
243
244
fe4da5cc 245 const Double_t loCorr = 1/TMath::Cos(0.5*loAng*kDegrad);
246 const Double_t hiCorr = 1/TMath::Cos(0.5*hiAng*kDegrad);
1283eee5 247
248 Double_t rl,ru;
249
250
fe4da5cc 251 //
252 // Get ALICE top node
fe4da5cc 253 //
1283eee5 254
255 Top=gAlice->GetGeometry()->GetNode("alice");
256
257 // inner sectors
258
cc80f89e 259 rl = fTPCParam->GetInnerRadiusLow();
260 ru = fTPCParam->GetInnerRadiusUp();
1283eee5 261
262
fe4da5cc 263 for(i=0;i<nLo;i++) {
264 sprintf(name,"LS%2.2d",i);
1283eee5 265 name[4]='\0';
266 sprintf(title,"TPC low sector %3d",i);
267 title[24]='\0';
268
269 tubs = new TTUBS(name,title,"void",rl*loCorr,ru*loCorr,250.,
270 loAng*(i-0.5)+loAngSh,loAng*(i+0.5)+loAngSh);
fe4da5cc 271 tubs->SetNumberOfDivisions(1);
272 Top->cd();
273 Node = new TNode(name,title,name,0,0,0,"");
274 Node->SetLineColor(kColorTPC);
275 fNodes->Add(Node);
276 }
1283eee5 277
fe4da5cc 278 // Outer sectors
1283eee5 279
cc80f89e 280 rl = fTPCParam->GetOuterRadiusLow();
281 ru = fTPCParam->GetOuterRadiusUp();
1283eee5 282
fe4da5cc 283 for(i=0;i<nHi;i++) {
284 sprintf(name,"US%2.2d",i);
1283eee5 285 name[4]='\0';
fe4da5cc 286 sprintf(title,"TPC upper sector %d",i);
1283eee5 287 title[24]='\0';
288 tubs = new TTUBS(name,title,"void",rl*hiCorr,ru*hiCorr,250,
289 hiAng*(i-0.5)+hiAngSh,hiAng*(i+0.5)+hiAngSh);
fe4da5cc 290 tubs->SetNumberOfDivisions(1);
291 Top->cd();
292 Node = new TNode(name,title,name,0,0,0,"");
293 Node->SetLineColor(kColorTPC);
294 fNodes->Add(Node);
295 }
cc80f89e 296
297
1283eee5 298}
299
300
301
fe4da5cc 302//_____________________________________________________________________________
303Int_t AliTPC::DistancetoPrimitive(Int_t , Int_t )
304{
305 //
306 // Calculate distance from TPC to mouse on the display
307 // Dummy procedure
308 //
309 return 9999;
310}
311
fe4da5cc 312//_____________________________________________________________________________
313static Double_t SigmaY2(Double_t r, Double_t tgl, Double_t pt)
314{
315 //
3c0f9266 316 // Parametrised error of the cluster reconstruction (pad direction)
fe4da5cc 317 //
318 pt=TMath::Abs(pt)*1000.;
319 Double_t x=r/pt;
320 tgl=TMath::Abs(tgl);
321 Double_t s=a_rphi - b_rphi*r*tgl + c_rphi*x*x + d_rphi*x;
322 if (s<0.4e-3) s=0.4e-3;
3c0f9266 323 s*=1.3; //Iouri Belikov
fe4da5cc 324 return s;
325}
326
327//_____________________________________________________________________________
328static Double_t SigmaZ2(Double_t r, Double_t tgl)
329{
330 //
3c0f9266 331 // Parametrised error of the cluster reconstruction (drift direction)
fe4da5cc 332 //
333 tgl=TMath::Abs(tgl);
334 Double_t s=a_z - b_z*r*tgl + c_z*tgl*tgl;
335 if (s<0.4e-3) s=0.4e-3;
3c0f9266 336 s*=1.3; //Iouri Belikov
fe4da5cc 337 return s;
338}
339
340//_____________________________________________________________________________
3c0f9266 341inline Double_t f1(Double_t x1,Double_t y1,
fe4da5cc 342 Double_t x2,Double_t y2,
343 Double_t x3,Double_t y3)
344{
3c0f9266 345 //-----------------------------------------------------------------
346 // Initial approximation of the track curvature
fe4da5cc 347 //
3c0f9266 348 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
349 //-----------------------------------------------------------------
fe4da5cc 350 Double_t d=(x2-x1)*(y3-y2)-(x3-x2)*(y2-y1);
351 Double_t a=0.5*((y3-y2)*(y2*y2-y1*y1+x2*x2-x1*x1)-
352 (y2-y1)*(y3*y3-y2*y2+x3*x3-x2*x2));
353 Double_t b=0.5*((x2-x1)*(y3*y3-y2*y2+x3*x3-x2*x2)-
354 (x3-x2)*(y2*y2-y1*y1+x2*x2-x1*x1));
8c555625 355
fe4da5cc 356 Double_t xr=TMath::Abs(d/(d*x1-a)), yr=d/(d*y1-b);
8c555625 357
fe4da5cc 358 return -xr*yr/sqrt(xr*xr+yr*yr);
359}
360
361
362//_____________________________________________________________________________
3c0f9266 363inline Double_t f2(Double_t x1,Double_t y1,
fe4da5cc 364 Double_t x2,Double_t y2,
365 Double_t x3,Double_t y3)
366{
3c0f9266 367 //-----------------------------------------------------------------
368 // Initial approximation of the track curvature times center of curvature
fe4da5cc 369 //
3c0f9266 370 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
371 //-----------------------------------------------------------------
fe4da5cc 372 Double_t d=(x2-x1)*(y3-y2)-(x3-x2)*(y2-y1);
373 Double_t a=0.5*((y3-y2)*(y2*y2-y1*y1+x2*x2-x1*x1)-
374 (y2-y1)*(y3*y3-y2*y2+x3*x3-x2*x2));
375 Double_t b=0.5*((x2-x1)*(y3*y3-y2*y2+x3*x3-x2*x2)-
376 (x3-x2)*(y2*y2-y1*y1+x2*x2-x1*x1));
8c555625 377
fe4da5cc 378 Double_t xr=TMath::Abs(d/(d*x1-a)), yr=d/(d*y1-b);
379
380 return -a/(d*y1-b)*xr/sqrt(xr*xr+yr*yr);
381}
382
383//_____________________________________________________________________________
3c0f9266 384inline Double_t f3(Double_t x1,Double_t y1,
fe4da5cc 385 Double_t x2,Double_t y2,
386 Double_t z1,Double_t z2)
387{
3c0f9266 388 //-----------------------------------------------------------------
389 // Initial approximation of the tangent of the track dip angle
fe4da5cc 390 //
3c0f9266 391 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
392 //-----------------------------------------------------------------
fe4da5cc 393 return (z1 - z2)/sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
394}
395
396//_____________________________________________________________________________
cc80f89e 397static Int_t FindProlongation(AliTPCtrack& t, const AliTPCSector *sec,
398 Int_t s, Int_t rf=0)
fe4da5cc 399{
3c0f9266 400 //-----------------------------------------------------------------
401 // This function tries to find a track prolongation.
fe4da5cc 402 //
3c0f9266 403 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
404 //-----------------------------------------------------------------
cc80f89e 405 const Int_t ROWS_TO_SKIP=(t<10) ? 10 : Int_t(0.5*sec->GetNRows());
3c0f9266 406 const Float_t MAX_CHI2=12.;
cc80f89e 407 Int_t try_again=ROWS_TO_SKIP;
fe4da5cc 408 Double_t alpha=sec->GetAlpha();
cc80f89e 409 Int_t ns=Int_t(2*TMath::Pi()/alpha+0.5);
8c555625 410
cc80f89e 411 for (Int_t nr=sec->GetRowNumber(t.GetX())-1; nr>=rf; nr--) {
3c0f9266 412 Double_t x=sec->GetX(nr), ymax=sec->GetMaxY(nr);
413 if (!t.PropagateTo(x)) return 0;
8c555625 414
3c0f9266 415 AliTPCcluster *cl=0;
fe4da5cc 416 Double_t max_chi2=MAX_CHI2;
417 const AliTPCRow& row=sec[s][nr];
418 Double_t sy2=SigmaY2(t.GetX(),t.GetTgl(),t.GetPt());
419 Double_t sz2=SigmaZ2(t.GetX(),t.GetTgl());
3c0f9266 420 Double_t road=5.*sqrt(t.GetSigmaY2() + sy2), y=t.GetY(), z=t.GetZ();
8c555625 421
fe4da5cc 422 if (road>30) {
3c0f9266 423 if (t>4) cerr<<t<<" FindProlongation warning: Too broad road !\n";
424 return 0;
fe4da5cc 425 }
8c555625 426
427 if (row) {
cc80f89e 428 for (Int_t i=row.Find(y-road); i<row; i++) {
fe4da5cc 429 AliTPCcluster* c=(AliTPCcluster*)(row[i]);
430 if (c->fY > y+road) break;
431 if (c->IsUsed()) continue;
3c0f9266 432 if ((c->fZ - z)*(c->fZ - z) > 25.*(t.GetSigmaZ2() + sz2)) continue;
fe4da5cc 433 Double_t chi2=t.GetPredictedChi2(c);
434 if (chi2 > max_chi2) continue;
435 max_chi2=chi2;
436 cl=c;
437 }
8c555625 438 }
fe4da5cc 439 if (cl) {
440 t.Update(cl,max_chi2);
cc80f89e 441 cl->fdEdX=sec->GetPadPitchWidth()*TMath::Sqrt((1+t.GetTgl()*t.GetTgl())/
3c0f9266 442 (1-(t.GetC()*x-t.GetEta())*(t.GetC()*x-t.GetEta())));
fe4da5cc 443 try_again=ROWS_TO_SKIP;
444 } else {
8c555625 445 if (try_again==0) break;
446 if (y > ymax) {
447 s = (s+1) % ns;
3c0f9266 448 if (!t.Rotate(alpha)) return 0;
8c555625 449 } else if (y <-ymax) {
3c0f9266 450 s = (s-1+ns) % ns;
451 if (!t.Rotate(-alpha)) return 0;
fe4da5cc 452 }
8c555625 453 try_again--;
fe4da5cc 454 }
455 }
8c555625 456
3c0f9266 457 return 1;
cc80f89e 458
fe4da5cc 459}
460
8c555625 461
fe4da5cc 462//_____________________________________________________________________________
cc80f89e 463static void MakeSeeds(TObjArray& seeds,const AliTPCSector *sec, Int_t max_sec,
464Int_t i1, Int_t i2)
fe4da5cc 465{
3c0f9266 466 //-----------------------------------------------------------------
467 // This function creates track seeds.
fe4da5cc 468 //
3c0f9266 469 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
470 //-----------------------------------------------------------------
fe4da5cc 471 TMatrix C(5,5); TVector x(5);
cc80f89e 472 Double_t alpha=sec->GetAlpha(), shift=sec->GetAlphaShift();
473 Double_t cs=cos(alpha), sn=sin(alpha);
474 for (Int_t ns=0; ns<max_sec; ns++) {
475 Int_t nl=sec[(ns-1+max_sec)%max_sec][i2];
476 Int_t nm=sec[ns][i2];
477 Int_t nu=sec[(ns+1)%max_sec][i2];
fe4da5cc 478 const AliTPCRow& r1=sec[ns][i1];
cc80f89e 479 for (Int_t is=0; is < r1; is++) {
480 Double_t x1=sec->GetX(i1), y1=r1[is]->fY, z1=r1[is]->fZ;
481 for (Int_t js=0; js < nl+nm+nu; js++) {
fe4da5cc 482 const AliTPCcluster *cl;
cc80f89e 483 Int_t ks;
484 Double_t x2=sec->GetX(i2), y2, z2, tmp;
3c0f9266 485
fe4da5cc 486 if (js<nl) {
8c555625 487 ks=(ns-1+max_sec)%max_sec;
fe4da5cc 488 const AliTPCRow& r2=sec[(ns-1+max_sec)%max_sec][i2];
489 cl=r2[js];
3c0f9266 490 y2=cl->fY; z2=cl->fZ;
491 tmp= x2*cs+y2*sn;
492 y2 =-x2*sn+y2*cs; x2=tmp;
fe4da5cc 493 } else
494 if (js<nl+nm) {
8c555625 495 ks=ns;
fe4da5cc 496 const AliTPCRow& r2=sec[ns][i2];
497 cl=r2[js-nl];
3c0f9266 498 y2=cl->fY; z2=cl->fZ;
fe4da5cc 499 } else {
8c555625 500 ks=(ns+1)%max_sec;
fe4da5cc 501 const AliTPCRow& r2=sec[(ns+1)%max_sec][i2];
502 cl=r2[js-nl-nm];
3c0f9266 503 y2=cl->fY; z2=cl->fZ;
504 tmp=x2*cs-y2*sn;
505 y2 =x2*sn+y2*cs; x2=tmp;
fe4da5cc 506 }
3c0f9266 507
cc80f89e 508 Double_t zz=z1 - z1/x1*(x1-x2);
509 if (TMath::Abs(zz-z2)>5) continue;
510
511 Double_t d=(x2-x1)*(0.-y2)-(0.-x2)*(y2-y1);
3c0f9266 512 if (d==0.) {cerr<<"MakeSeeds warning: Straight seed !\n"; continue;}
513
cc80f89e 514 Double_t x3=0., y3=0.;//gRandom->Gaus(0.,TMath::Sqrt(cl->fSigmaY2));
515
fe4da5cc 516 x(0)=y1;
517 x(1)=z1;
cc80f89e 518 x(2)=f1(x1,y1,x2,y2,x3,y3);
519 x(3)=f2(x1,y1,x2,y2,x3,y3);
fe4da5cc 520 x(4)=f3(x1,y1,x2,y2,z1,z2);
521
522 if (TMath::Abs(x(2)*x1-x(3)) >= 0.999) continue;
523
524 if (TMath::Abs(x(4)) > 1.2) continue;
8c555625 525
fe4da5cc 526 Double_t a=asin(x(3));
fe4da5cc 527 Double_t zv=z1 - x(4)/x(2)*(a+asin(x(2)*x1-x(3)));
cc80f89e 528 if (TMath::Abs(zv)>10.) continue;
8c555625 529
fe4da5cc 530 TMatrix X(6,6); X=0.;
531 X(0,0)=r1[is]->fSigmaY2; X(1,1)=r1[is]->fSigmaZ2;
532 X(2,2)=cl->fSigmaY2; X(3,3)=cl->fSigmaZ2;
cc80f89e 533 X(4,4)=cl->fSigmaY2; X(5,5)=cl->fSigmaZ2;
534 //X(4,4)=3./12.; X(5,5)=3./12.;
fe4da5cc 535 TMatrix F(5,6); F.UnitMatrix();
536 Double_t sy=sqrt(X(0,0)), sz=sqrt(X(1,1));
cc80f89e 537 F(2,0)=(f1(x1,y1+sy,x2,y2,x3,y3)-x(2))/sy;
538 F(2,2)=(f1(x1,y1,x2,y2+sy,x3,y3)-x(2))/sy;
539 F(2,4)=(f1(x1,y1,x2,y2,x3,y3+sy)-x(2))/sy;
540 F(3,0)=(f2(x1,y1+sy,x2,y2,x3,y3)-x(3))/sy;
541 F(3,2)=(f2(x1,y1,x2,y2+sy,x3,y3)-x(3))/sy;
542 F(3,4)=(f2(x1,y1,x2,y2,x3,y3+sy)-x(3))/sy;
fe4da5cc 543 F(4,0)=(f3(x1,y1+sy,x2,y2,z1,z2)-x(4))/sy;
544 F(4,1)=(f3(x1,y1,x2,y2,z1+sz,z2)-x(4))/sz;
545 F(4,2)=(f3(x1,y1,x2,y2+sy,z1,z2)-x(4))/sy;
546 F(4,3)=(f3(x1,y1,x2,y2,z1,z2+sz)-x(4))/sz;
547 F(4,4)=0;
548 F(3,3)=0;
549
550 TMatrix t(F,TMatrix::kMult,X);
551 C.Mult(t,TMatrix(TMatrix::kTransposed,F));
8c555625 552
3c0f9266 553 AliTPCtrack *track=new AliTPCtrack(r1[is], x, C, x1, ns*alpha+shift);
cc80f89e 554 Int_t rc=FindProlongation(*track,sec,ns,i2);
8c555625 555 if (rc<0 || *track<(i1-i2)/2) delete track;
556 else seeds.AddLast(track);
fe4da5cc 557 }
558 }
559 }
560}
561
562//_____________________________________________________________________________
3c0f9266 563AliTPCParam *AliTPCSector::param;
fe4da5cc 564void AliTPC::Clusters2Tracks()
565{
3c0f9266 566 //-----------------------------------------------------------------
567 // This is a track finder.
fe4da5cc 568 //
3c0f9266 569 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
570 //-----------------------------------------------------------------
fe4da5cc 571 if (!fClusters) return;
8c555625 572
cc80f89e 573 AliTPCParam *p=fTPCParam;
3c0f9266 574 AliTPCSector::SetParam(p);
8c555625 575
cc80f89e 576 const Int_t nis=p->GetNInnerSector()/2;
3c0f9266 577 AliTPCSSector *ssec=new AliTPCSSector[nis];
cc80f89e 578 Int_t nrow_low=ssec->GetNRows();
8c555625 579
cc80f89e 580 const Int_t nos=p->GetNOuterSector()/2;
3c0f9266 581 AliTPCLSector *lsec=new AliTPCLSector[nos];
cc80f89e 582 Int_t nrow_up=lsec->GetNRows();
8c555625 583
cc80f89e 584 Int_t ncl=fClusters->GetEntriesFast();
fe4da5cc 585 while (ncl--) {
586 AliTPCcluster *c=(AliTPCcluster*)fClusters->UncheckedAt(ncl);
3c0f9266 587 Int_t sec=c->fSector, row=c->fPadRow;
cc80f89e 588
3c0f9266 589 if (sec<nis*2) {
590 ssec[sec%nis][row].InsertCluster(c);
fe4da5cc 591 } else {
3c0f9266 592 sec -= nis*2;
593 lsec[sec%nos][row].InsertCluster(c);
fe4da5cc 594 }
595 }
596
fe4da5cc 597 TObjArray seeds(20000);
3c0f9266 598
cc80f89e 599 Int_t nrows=nrow_low+nrow_up;
600 Int_t gap=Int_t(0.125*nrows), shift=Int_t(0.5*gap);
3c0f9266 601 MakeSeeds(seeds, lsec, nos, nrow_up-1, nrow_up-1-gap);
602 MakeSeeds(seeds, lsec, nos, nrow_up-1-shift, nrow_up-1-shift-gap);
8c555625 603
fe4da5cc 604 seeds.Sort();
cc80f89e 605
606 Int_t found=0;
607 Int_t nseed=seeds.GetEntriesFast();
608
609 for (Int_t s=0; s<nseed; s++) {
610 AliTPCtrack *pt=(AliTPCtrack*)seeds.UncheckedAt(s), &t=*pt;
611 Double_t alpha=t.GetAlpha();
fe4da5cc 612 if (alpha > 2.*TMath::Pi()) alpha -= 2.*TMath::Pi();
613 if (alpha < 0. ) alpha += 2.*TMath::Pi();
cc80f89e 614 Int_t ns=Int_t(alpha/lsec->GetAlpha())%nos;
3c0f9266 615
616 if (!FindProlongation(t,lsec,ns)) continue;
617
618 alpha=t.GetAlpha() + 0.5*ssec->GetAlpha() - ssec->GetAlphaShift();
619 if (alpha > 2.*TMath::Pi()) alpha -= 2.*TMath::Pi();
620 if (alpha < 0. ) alpha += 2.*TMath::Pi();
cc80f89e 621 ns=Int_t(alpha/ssec->GetAlpha())%nis; //index of the inner sector needed
3c0f9266 622
623 alpha=ns*ssec->GetAlpha() - t.GetAlpha();
624 if (!t.Rotate(alpha)) continue;
fe4da5cc 625
cc80f89e 626 if (!FindProlongation(t,ssec,ns)) continue;
fe4da5cc 627
cc80f89e 628 if (t >= Int_t(0.4*nrows)) {
629 AddTrack(t);
630 t.UseClusters();
631 cerr<<found++<<'\r';
632 }
633 delete pt;
fe4da5cc 634 }
3c0f9266 635
636 delete[] ssec;
637 delete[] lsec;
cc80f89e 638
fe4da5cc 639}
640
641//_____________________________________________________________________________
642void AliTPC::CreateMaterials()
643{
8c555625 644 //-----------------------------------------------
fe4da5cc 645 // Create Materials for for TPC
8c555625 646 //-----------------------------------------------
647
648 //-----------------------------------------------------------------
649 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
650 //-----------------------------------------------------------------
1283eee5 651
fe4da5cc 652 Int_t ISXFLD=gAlice->Field()->Integ();
653 Float_t SXMGMX=gAlice->Field()->Max();
1283eee5 654
655 Float_t amat[5]; // atomic numbers
656 Float_t zmat[5]; // z
657 Float_t wmat[5]; // proportions
658
659 Float_t density;
660
661 // ********************* Gases *******************
662
663 //--------------------------------------------------------------
664 // pure gases
665 //--------------------------------------------------------------
666
667 // Ne
668
669
670 Float_t a_ne = 20.18;
671 Float_t z_ne = 10.;
fe4da5cc 672
1283eee5 673 density = 0.0009;
674
675 AliMaterial(20,"Ne",a_ne,z_ne,density,999.,999.);
676
677 // Ar
678
679 Float_t a_ar = 39.948;
680 Float_t z_ar = 18.;
681
682 density = 0.001782;
683
684 AliMaterial(21,"Ar",a_ar,z_ar,density,999.,999.);
685
686 Float_t a_pure[2];
fe4da5cc 687
1283eee5 688 a_pure[0] = a_ne;
689 a_pure[1] = a_ar;
fe4da5cc 690
1283eee5 691
692 //--------------------------------------------------------------
693 // gases - compounds
694 //--------------------------------------------------------------
695
696 Float_t amol[3];
697
698 // CO2
699
700 amat[0]=12.011;
701 amat[1]=15.9994;
702
703 zmat[0]=6.;
704 zmat[1]=8.;
705
706 wmat[0]=1.;
707 wmat[1]=2.;
708
709 density=0.001977;
710
711 amol[0] = amat[0]*wmat[0]+amat[1]*wmat[1];
712
713 AliMixture(10,"CO2",amat,zmat,density,-2,wmat);
714
715 // CF4
716
717 amat[0]=12.011;
718 amat[1]=18.998;
719
720 zmat[0]=6.;
721 zmat[1]=9.;
722
723 wmat[0]=1.;
724 wmat[1]=4.;
725
726 density=0.003034;
727
728 amol[1] = amat[0]*wmat[0]+amat[1]*wmat[1];
729
730 AliMixture(11,"CF4",amat,zmat,density,-2,wmat);
731
732 // CH4
733
734 amat[0]=12.011;
735 amat[1]=1.;
736
737 zmat[0]=6.;
738 zmat[1]=1.;
739
740 wmat[0]=1.;
741 wmat[1]=4.;
742
743 density=0.000717;
744
745 amol[2] = amat[0]*wmat[0]+amat[1]*wmat[1];
746
747 AliMixture(12,"CH4",amat,zmat,density,-2,wmat);
748
749 //----------------------------------------------------------------
750 // gases - mixtures, ID >= 20 pure gases, <= 10 ID < 20 -compounds
751 //----------------------------------------------------------------
752
fe4da5cc 753 char namate[21];
1283eee5 754
755 density = 0.;
756 Float_t am=0;
757 Int_t nc;
758
759 Float_t a,z,rho,absl,X0,buf[1];
760 Int_t nbuf;
761
762 for(nc = 0;nc<fNoComp;nc++)
763 {
764
765 // retrive material constants
766
767 gMC->Gfmate((*fIdmate)[fMixtComp[nc]],namate,a,z,rho,X0,absl,buf,nbuf);
768
769 amat[nc] = a;
770 zmat[nc] = z;
771
772 Int_t nnc = (fMixtComp[nc]>=20) ? fMixtComp[nc]%20 : fMixtComp[nc]%10;
773
774 am += fMixtProp[nc]*((fMixtComp[nc]>=20) ? a_pure[nnc] : amol[nnc]);
775 density += fMixtProp[nc]*rho; // density of the mixture
776
777 }
778
779 // mixture proportions by weight!
780
781 for(nc = 0;nc<fNoComp;nc++)
782 {
783
784 Int_t nnc = (fMixtComp[nc]>=20) ? fMixtComp[nc]%20 : fMixtComp[nc]%10;
785
786 wmat[nc] = fMixtProp[nc]*((fMixtComp[nc]>=20) ? a_pure[nnc] : amol[nnc])/am;
787
788 }
fe4da5cc 789
1283eee5 790 AliMixture(31,"Drift gas 1",amat,zmat,density,fNoComp,wmat);
791 AliMixture(32,"Drift gas 2",amat,zmat,density,fNoComp,wmat);
792 AliMixture(33,"Drift gas 3",amat,zmat,density,fNoComp,wmat);
793
794 AliMedium(2, "Drift gas 1", 31, 0, ISXFLD, SXMGMX, 10., 999.,.1, .001, .001);
795 AliMedium(3, "Drift gas 2", 32, 0, ISXFLD, SXMGMX, 10., 999.,.1, .001, .001);
796 AliMedium(4, "Drift gas 3", 33, 1, ISXFLD, SXMGMX, 10., 999.,.1, .001, .001);
797
798 // Air
799
800 AliMaterial(24, "Air", 14.61, 7.3, .001205, 30420., 67500.);
801
802 AliMedium(24, "Air", 24, 0, ISXFLD, SXMGMX, 10., .1, .1, .1, .1);
803
804 //----------------------------------------------------------------------
805 // solid materials
806 //----------------------------------------------------------------------
807
808 // Al
809
810 AliMaterial(30, "Al", 26.98, 13., 2.7, 8.9, 37.2);
811
812 AliMedium(0, "Al",30, 0, ISXFLD, SXMGMX, 10., .1, .1, .1, .1);
813
814 // Si
815
816 AliMaterial(31, "Si", 28.086, 14.,2.33, 9.36, 999.);
817
818 AliMedium(7, "Al",31, 0, ISXFLD, SXMGMX, 10., .1, .1, .1, .1);
fe4da5cc 819
1283eee5 820
821 // Mylar C5H4O2
822
823 amat[0]=12.011;
824 amat[1]=1.;
825 amat[2]=15.9994;
826
827 zmat[0]=6.;
828 zmat[1]=1.;
829 zmat[2]=8.;
830
831 wmat[0]=5.;
832 wmat[1]=4.;
833 wmat[2]=2.;
834
835 density = 1.39;
fe4da5cc 836
1283eee5 837 AliMixture(32, "Mylar",amat,zmat,density,-3,wmat);
838
839 AliMedium(5, "Mylar",32, 0, ISXFLD, SXMGMX, 10., .1, .1, .001, .01);
840
841
842
843
844 // Carbon (normal)
845
846 AliMaterial(33,"C normal",12.011,6.,2.265,18.8,999.);
847
848 AliMedium(6,"C normal",33,0, ISXFLD, SXMGMX, 10., .1, .1, .001, .01);
849
850 // G10 for inner and outr field cage
851 // G10 is 60% SiO2 + 40% epoxy, right now I use A and Z for SiO2
852
853 Float_t rhoFactor;
854
855 amat[0]=28.086;
856 amat[1]=15.9994;
857
858 zmat[0]=14.;
859 zmat[1]=8.;
860
861 wmat[0]=1.;
862 wmat[1]=2.;
863
864 density = 1.7;
fe4da5cc 865
1283eee5 866
867 AliMixture(34,"G10 aux.",amat,zmat,density,-2,wmat);
868
869
870 gMC->Gfmate((*fIdmate)[34],namate,a,z,rho,X0,absl,buf,nbuf);
871
872 Float_t thickX0 = 0.0052; // field cage in X0 units
fe4da5cc 873
1283eee5 874 Float_t thick = 2.; // in cm
875
876 X0=19.4; // G10
877
878 rhoFactor = X0*thickX0/thick;
879 density = rho*rhoFactor;
880
881 AliMaterial(35,"G10-fc",a,z,density,999.,999.);
882
883 AliMedium(8,"G10-fc",35,0, ISXFLD, SXMGMX, 10., .1, .1, .001, .01);
884
885 thickX0 = 0.0027; // inner vessel (eta <0.9)
886 thick=0.5;
887 rhoFactor = X0*thickX0/thick;
888 density = rho*rhoFactor;
889
890 AliMaterial(36,"G10-iv",a,z,density,999.,999.);
891
892 AliMedium(9,"G10-iv",36,0, ISXFLD, SXMGMX, 10., .1, .1, .001, .01);
893
894 // Carbon fibre
fe4da5cc 895
1283eee5 896 gMC->Gfmate((*fIdmate)[33],namate,a,z,rho,X0,absl,buf,nbuf);
897
898 thickX0 = 0.0133; // outer vessel
899 thick=3.0;
900 rhoFactor = X0*thickX0/thick;
901 density = rho*rhoFactor;
902
903
904 AliMaterial(37,"C-ov",a,z,density,999.,999.);
905
906 AliMedium(10,"C-ov",37,0, ISXFLD, SXMGMX, 10., .1, .1, .001, .01);
907
908 thickX0=0.015; // inner vessel (cone, eta > 0.9)
909 thick=1.5;
910 rhoFactor = X0*thickX0/thick;
911 density = rho*rhoFactor;
912
913 AliMaterial(38,"C-ivc",a,z,density,999.,999.);
914
915 AliMedium(11,"C-ivc",38,0, ISXFLD, SXMGMX, 10., .1, .1, .001, .01);
916
917 //
918
919 AliMedium(12,"CO2",10,0, ISXFLD, SXMGMX, 10., 999.,.1, .001, .001);
920
fe4da5cc 921}
922
923//_____________________________________________________________________________
924struct Bin {
cc80f89e 925 UShort_t q;
926 UInt_t mask;
927 Bin();
fe4da5cc 928};
cc80f89e 929Bin::Bin() {q=0; mask=0xFFFFFFFE;}
fe4da5cc 930
cc80f89e 931struct Peak {
932 Int_t k;
933 UInt_t mask;
fe4da5cc 934};
cc80f89e 935inline Bool_t IsMaximum(Int_t k, Int_t max, const Bin *bins) {
936 UShort_t q=bins[k].q;
937 if (q==1023) return kFALSE;
938 if (bins[k-max].q > q) return kFALSE;
939 if (bins[k-1 ].q > q) return kFALSE;
940 if (bins[k+max].q > q) return kFALSE;
941 if (bins[k+1 ].q > q) return kFALSE;
942 if (bins[k-max-1].q > q) return kFALSE;
943 if (bins[k+max-1].q > q) return kFALSE;
944 if (bins[k+max+1].q > q) return kFALSE;
945 if (bins[k-max+1].q > q) return kFALSE;
946 return kTRUE;
947}
948static void FindPeaks(Int_t k, Int_t max, Bin *bins, Peak *peaks, Int_t& n) {
949//if (n>=31) return;
950 if (n<31)
951 if (IsMaximum(k,max,bins)) {
952 peaks[n].k=k; peaks[n].mask=(2<<n);
953 n++;
954 }
955 bins[k].mask=0;
956 if (bins[k-max].mask&1) FindPeaks(k-max,max,bins,peaks,n);
957 if (bins[k-1 ].mask&1) FindPeaks(k-1 ,max,bins,peaks,n);
958 if (bins[k+max].mask&1) FindPeaks(k+max,max,bins,peaks,n);
959 if (bins[k+1 ].mask&1) FindPeaks(k+1 ,max,bins,peaks,n);
960}
fe4da5cc 961
cc80f89e 962static void MarkPeak(Int_t k, Int_t max, Bin *bins, UInt_t m) {
963 UShort_t q=bins[k].q;
8c555625 964
cc80f89e 965 bins[k].mask |= m;
966
967 if (bins[k-max].q <= q)
968 if ((bins[k-max].mask&m) == 0) MarkPeak(k-max,max,bins,m);
969 if (bins[k-1 ].q <= q)
970 if ((bins[k-1 ].mask&m) == 0) MarkPeak(k-1 ,max,bins,m);
971 if (bins[k+max].q <= q)
972 if ((bins[k+max].mask&m) == 0) MarkPeak(k+max,max,bins,m);
973 if (bins[k+1 ].q <= q)
974 if ((bins[k+1 ].mask&m) == 0) MarkPeak(k+1 ,max,bins,m);
975}
976
977static void MakeCluster(Int_t k,Int_t max,Bin *bins,UInt_t m,AliTPCcluster &c){
978 Float_t q=(Float_t)bins[k].q;
979 Int_t i=k/max, j=k-i*max;
fe4da5cc 980 c.fY += i*q;
981 c.fZ += j*q;
982 c.fSigmaY2 += i*i*q;
983 c.fSigmaZ2 += j*j*q;
984 c.fQ += q;
8c555625 985
cc80f89e 986 bins[k].mask = 0xFFFFFFFE;
fe4da5cc 987
cc80f89e 988 if (bins[k-max].mask == m) MakeCluster(k-max,max,bins,m,c);
989 if (bins[k-1 ].mask == m) MakeCluster(k-1 ,max,bins,m,c);
990 if (bins[k+max].mask == m) MakeCluster(k+max,max,bins,m,c);
991 if (bins[k+1 ].mask == m) MakeCluster(k+1 ,max,bins,m,c);
fe4da5cc 992}
993
994//_____________________________________________________________________________
995void AliTPC::Digits2Clusters()
996{
3c0f9266 997 //-----------------------------------------------------------------
998 // This is a simple cluster finder.
fe4da5cc 999 //
3c0f9266 1000 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
1001 //-----------------------------------------------------------------
cc80f89e 1002 AliTPCParam *par = fTPCParam;
1003 const Int_t MAXZ=par->GetMaxTBin()+2;
1004
1005 TTree *t = (TTree *)gDirectory->Get("TreeD_75x40_100x60");
1006 AliSimDigits digarr, *dummy=&digarr;
1007 t->GetBranch("Segment")->SetAddress(&dummy);
1008 Stat_t sectors_by_rows = t->GetEntries();
fe4da5cc 1009 for (Int_t n=0; n<sectors_by_rows; n++) {
cc80f89e 1010 t->GetEvent(n);
1011 Int_t sec, row;
1012 if (!par->AdjustSectorRow(digarr.GetID(),sec,row)) {
1013 cerr<<"AliTPC warning: invalid segment ID ! "<<digarr.GetID()<<endl;
1014 continue;
1015 }
1016
1017 Float_t rx=par->GetPadRowRadii(sec,row);
1018
1019 Int_t npads, sign;
3c0f9266 1020 {
cc80f89e 1021 Int_t nis=par->GetNInnerSector(), nos=par->GetNOuterSector();
3c0f9266 1022 if (sec < nis) {
1023 npads = par->GetNPadsLow(row);
1024 sign = (sec < nis/2) ? 1 : -1;
1025 } else {
1026 npads = par->GetNPadsUp(row);
1027 sign = ((sec-nis) < nos/2) ? 1 : -1;
1028 }
fe4da5cc 1029 }
3c0f9266 1030
cc80f89e 1031 const Int_t MAXBIN=MAXZ*(npads+2);
1032 Bin *bins=new Bin[MAXBIN];
1033
1034 digarr.First();
1035 do {
1036 Short_t dig=digarr.CurrentDigit();
1037 if (dig<=par->GetZeroSup()) continue;
1038 Int_t j=digarr.CurrentRow()+1, i=digarr.CurrentColumn()+1;
1039 bins[i*MAXZ+j].q=dig;
1040 bins[i*MAXZ+j].mask=1;
1041 } while (digarr.Next());
1042
1043 Int_t ncl=0;
1044 for (Int_t i=0; i<MAXBIN; i++) {
1045 if ((bins[i].mask&1) == 0) continue;
1046 Peak peaks[32]; Int_t npeaks=0;
1047 FindPeaks(i, MAXZ, bins, peaks, npeaks);
1048
1049 if (npeaks>30) continue;
1050
1051 Int_t k,l;
1052 for (k=0; k<npeaks-1; k++){//mark adjacent peaks
1053 if (peaks[k].k < 0) continue; //this peak is already removed
1054 for (l=k+1; l<npeaks; l++) {
1055 if (peaks[l].k < 0) continue; //this peak is already removed
1056 Int_t ki=peaks[k].k/MAXZ, kj=peaks[k].k - ki*MAXZ;
1057 Int_t li=peaks[l].k/MAXZ, lj=peaks[l].k - li*MAXZ;
1058 Int_t di=TMath::Abs(ki - li);
1059 Int_t dj=TMath::Abs(kj - lj);
1060 if (di>1 || dj>1) continue;
1061 if (bins[peaks[k].k].q > bins[peaks[l].k].q) {
1062 peaks[l].mask=peaks[k].mask;
1063 peaks[l].k*=-1;
1064 } else {
1065 peaks[k].mask=peaks[l].mask;
1066 peaks[k].k*=-1;
1067 break;
1068 }
1069 }
3c0f9266 1070 }
3c0f9266 1071
cc80f89e 1072 for (k=0; k<npeaks; k++) {
1073 MarkPeak(TMath::Abs(peaks[k].k), MAXZ, bins, peaks[k].mask);
fe4da5cc 1074 }
3c0f9266 1075
cc80f89e 1076 for (k=0; k<npeaks; k++) {
1077 if (peaks[k].k < 0) continue; //removed peak
1078 AliTPCcluster c;
1079 MakeCluster(peaks[k].k, MAXZ, bins, peaks[k].mask, c);
1080 if (c.fQ < 5) continue; //noise cluster
1081 c.fY /= c.fQ;
1082 c.fZ /= c.fQ;
1083
1084 Double_t s2 = c.fSigmaY2/c.fQ - c.fY*c.fY;
1085 c.fSigmaY2 = s2 + 1./12.;
1086 c.fSigmaY2 *= par->GetPadPitchWidth(sec)*par->GetPadPitchWidth(sec);
1087 if (s2 != 0.) {
1088 c.fSigmaY2 *= 0.064*1.3*1.3;
1089 if (sec<par->GetNInnerSector()) c.fSigmaY2 *= 1.44*1.44;
1090 }
1091
1092 s2 = c.fSigmaZ2/c.fQ - c.fZ*c.fZ;
1093 c.fSigmaZ2 = s2 + 1./12.;
1094 c.fSigmaZ2 *= par->GetZWidth()*par->GetZWidth();
1095 if (s2 != 0.) {
1096 c.fSigmaZ2 *= 0.10*1.3*1.3;
1097 if (sec<par->GetNInnerSector()) c.fSigmaZ2 *= 1.33*1.33;
1098 }
1099
1100 c.fY = (c.fY - 0.5 - 0.5*npads)*par->GetPadPitchWidth(sec);
1101 c.fZ = par->GetZWidth()*(c.fZ-1);
1102 c.fZ -= 3.*par->GetZSigma(); // PASA delay
1103 c.fZ = sign*(z_end - c.fZ);
1104
1105 if (rx<230./250.*TMath::Abs(c.fZ)) continue;
1106
1107 c.fSector=sec;
1108 c.fPadRow=row;
1109 Int_t ki=peaks[k].k/MAXZ, kj=peaks[k].k - ki*MAXZ;
1110 c.fTracks[0]=digarr.GetTrackID(kj-1,ki-1,0);
1111 c.fTracks[1]=digarr.GetTrackID(kj-1,ki-1,1);
1112 c.fTracks[2]=digarr.GetTrackID(kj-1,ki-1,2);
1113
1114 c.fQ=bins[peaks[k].k].q;
1115
1116 if (ki==1 || ki==npads || kj==1 || kj==MAXZ-2) {
1117 c.fSigmaY2 *= 25.;
1118 c.fSigmaZ2 *= 4.;
1119 }
1120
1121 AddCluster(c); ncl++;
3c0f9266 1122 }
fe4da5cc 1123 }
3c0f9266 1124
cc80f89e 1125 cerr<<"sector, row, compressed digits, clusters: "
1126 <<sec<<' '<<row<<' '<<digarr.GetSize()<<' '<<ncl<<" \r";
1127
3c0f9266 1128 delete[] bins;
fe4da5cc 1129 }
1130}
1131
fe4da5cc 1132//_____________________________________________________________________________
1133void AliTPC::Hits2Clusters()
1134{
8c555625 1135 //--------------------------------------------------------
fe4da5cc 1136 // TPC simple cluster generator from hits
1137 // obtained from the TPC Fast Simulator
8c555625 1138 // The point errors are taken from the parametrization
1139 //--------------------------------------------------------
1140
1141 //-----------------------------------------------------------------
1142 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
1143 //-----------------------------------------------------------------
3c0f9266 1144
cc80f89e 1145 if(fTPCParam == 0){
1146 printf("AliTPCParam MUST be created firstly\n");
1147 return;
1148 }
1149
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();
1167
1168 //------------------------------------------------------------
cc80f89e 1169 // Loop over all sectors (72 sectors for 20 deg
1170 // segmentation for both lower and upper sectors)
1171 // Sectors 0-35 are lower sectors, 0-17 z>0, 17-35 z<0
3c0f9266 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 //------------------------------------------------------------
cc80f89e 1176
1177 for(Int_t isec=0;isec<fTPCParam->GetNSector();isec++){
8c555625 1178 //MI change
cc80f89e 1179 fTPCParam->AdjustCosSin(isec,cph,sph);
fe4da5cc 1180
1181 //------------------------------------------------------------
1182 // Loop over tracks
1183 //------------------------------------------------------------
1184
1185 for(Int_t track=0;track<ntracks;track++){
1186 ResetHits();
1187 TH->GetEvent(track);
1188 //
1189 // Get number of the TPC hits and a pointer
1190 // to the particles
1191 //
1192 nhits=fHits->GetEntriesFast();
cc80f89e 1193 Particles=gAlice->Particles();
fe4da5cc 1194 //
1195 // Loop over hits
1196 //
1197 for(Int_t hit=0;hit<nhits;hit++){
1198 tpcHit=(AliTPChit*)fHits->UncheckedAt(hit);
cc80f89e 1199 if (tpcHit->fQ == 0.) continue; //information about track (I.Belikov)
fe4da5cc 1200 sector=tpcHit->fSector; // sector number
1201 if(sector != isec) continue; //terminate iteration
1202 ipart=tpcHit->fTrack;
1578254f 1203 particle=(TParticle*)Particles->UncheckedAt(ipart);
1204 pl=particle->Pz();
1205 pt=particle->Pt();
fe4da5cc 1206 if(pt < 1.e-9) pt=1.e-9;
1207 tanth=pl/pt;
1208 tanth = TMath::Abs(tanth);
1209 rpad=TMath::Sqrt(tpcHit->fX*tpcHit->fX + tpcHit->fY*tpcHit->fY);
1210 ratio=0.001*rpad/pt; // pt must be in MeV/c - historical reason
1211
1212 // space-point resolutions
1213
1214 sigma_rphi=SigmaY2(rpad,tanth,pt);
1215 sigma_z =SigmaZ2(rpad,tanth );
1216
1217 // cluster widths
1218
1219 cl_rphi=ac_rphi-bc_rphi*rpad*tanth+cc_rphi*ratio*ratio;
1220 cl_z=ac_z-bc_z*rpad*tanth+cc_z*tanth*tanth;
1221
1222 // temporary protection
1223
1224 if(sigma_rphi < 0.) sigma_rphi=0.4e-3;
1225 if(sigma_z < 0.) sigma_z=0.4e-3;
1226 if(cl_rphi < 0.) cl_rphi=2.5e-3;
1227 if(cl_z < 0.) cl_z=2.5e-5;
1228
1229 //
cc80f89e 1230
1231 //
1232 // smearing --> rotate to the 1 (13) or to the 25 (49) sector,
fe4da5cc 1233 // then the inaccuracy in a X-Y plane is only along Y (pad row)!
1234 //
cc80f89e 1235 //Float_t xprim= tpcHit->fX*cph + tpcHit->fY*sph;
fe4da5cc 1236 Float_t yprim=-tpcHit->fX*sph + tpcHit->fY*cph;
1237 xyz[0]=gRandom->Gaus(yprim,TMath::Sqrt(sigma_rphi)); // y
1238 xyz[1]=gRandom->Gaus(tpcHit->fZ,TMath::Sqrt(sigma_z)); // z
cc80f89e 1239 xyz[2]=tpcHit->fQ; // q
fe4da5cc 1240 xyz[3]=sigma_rphi; // fSigmaY2
1241 xyz[4]=sigma_z; // fSigmaZ2
cc80f89e 1242
1243 Int_t tracks[5]={tpcHit->fTrack, -1, -1, sector, tpcHit->fPadRow};
fe4da5cc 1244 AddCluster(xyz,tracks);
1245
1246 } // end of loop over hits
cc80f89e 1247 } // end of loop over tracks
fe4da5cc 1248
cc80f89e 1249 } // end of loop over sectors
1250
1251} // end of function
1252
1253//_________________________________________________________________
1254void AliTPC::Hits2ExactClustersSector(Int_t isec)
1255{
1256 //--------------------------------------------------------
1257 //calculate exact cross point of track and given pad row
1258 //resulting values are expressed in "digit" coordinata
1259 //--------------------------------------------------------
1260
1261 //-----------------------------------------------------------------
1262 // Origin: Marian Ivanov GSI Darmstadt, m.ivanov@gsi.de
1263 //-----------------------------------------------------------------
1264 //
1265 if (fClustersArray==0){
1266 return;
1267 }
1268 //
1269 TParticle *particle; // pointer to a given particle
1270 AliTPChit *tpcHit; // pointer to a sigle TPC hit
1271 TClonesArray *Particles; //pointer to the particle list
1272 Int_t sector,nhits;
1273 Int_t ipart;
1274 const Int_t cmaxhits=30000;
1275 TVector * xxxx = new TVector(cmaxhits*4);
1276 TVector & xxx = *xxxx;
1277 Int_t maxhits = cmaxhits;
1278 //construct array for each padrow
1279 for (Int_t i=0; i<fTPCParam->GetNRow(isec);i++)
1280 fClustersArray->CreateRow(isec,i);
fe4da5cc 1281
cc80f89e 1282 //---------------------------------------------------------------
1283 // Get the access to the tracks
1284 //---------------------------------------------------------------
1285
1286 TTree *TH = gAlice->TreeH();
1287 Stat_t ntracks = TH->GetEntries();
1288 Particles=gAlice->Particles();
1289 Int_t npart = Particles->GetEntriesFast();
1290
1291 //------------------------------------------------------------
1292 // Loop over tracks
1293 //------------------------------------------------------------
fe4da5cc 1294
cc80f89e 1295 for(Int_t track=0;track<ntracks;track++){
1296 ResetHits();
1297 TH->GetEvent(track);
1298 //
1299 // Get number of the TPC hits and a pointer
1300 // to the particles
1301 //
1302 nhits=fHits->GetEntriesFast();
1303 //
1304 // Loop over hits
1305 //
1306 Int_t currentIndex=0;
1307 Int_t lastrow=-1; //last writen row
1308 for(Int_t hit=0;hit<nhits;hit++){
1309 tpcHit=(AliTPChit*)fHits->UncheckedAt(hit);
1310 if (tpcHit==0) continue;
1311 sector=tpcHit->fSector; // sector number
1312 if(sector != isec) continue;
1313 ipart=tpcHit->fTrack;
1314 if (ipart<npart) particle=(TParticle*)Particles->UncheckedAt(ipart);
1315
1316 //find row number
1317
1318 Float_t x[3]={tpcHit->fX,tpcHit->fY,tpcHit->fZ};
1319 Int_t index[3]={1,isec,0};
1320 Int_t currentrow = fTPCParam->GetPadRow(x,index) ;
1321 if (currentrow<0) continue;
1322 if (lastrow<0) lastrow=currentrow;
1323 if (currentrow==lastrow){
1324 if ( currentIndex>=maxhits){
1325 maxhits+=cmaxhits;
1326 xxx.ResizeTo(4*maxhits);
1327 }
1328 xxx(currentIndex*4)=x[0];
1329 xxx(currentIndex*4+1)=x[1];
1330 xxx(currentIndex*4+2)=x[2];
1331 xxx(currentIndex*4+3)=tpcHit->fQ;
1332 currentIndex++;
1333 }
1334 else
1335 if (currentIndex>2){
1336 Float_t sumx=0;
1337 Float_t sumx2=0;
1338 Float_t sumx3=0;
1339 Float_t sumx4=0;
1340 Float_t sumy=0;
1341 Float_t sumxy=0;
1342 Float_t sumx2y=0;
1343 Float_t sumz=0;
1344 Float_t sumxz=0;
1345 Float_t sumx2z=0;
1346 Float_t sumq=0;
1347 for (Int_t index=0;index<currentIndex;index++){
1348 Float_t x,x2,x3,x4;
1349 x=x2=x3=x4=xxx(index*4);
1350 x2*=x;
1351 x3*=x2;
1352 x4*=x3;
1353 sumx+=x;
1354 sumx2+=x2;
1355 sumx3+=x3;
1356 sumx4+=x4;
1357 sumy+=xxx(index*4+1);
1358 sumxy+=xxx(index*4+1)*x;
1359 sumx2y+=xxx(index*4+1)*x2;
1360 sumz+=xxx(index*4+2);
1361 sumxz+=xxx(index*4+2)*x;
1362 sumx2z+=xxx(index*4+2)*x2;
1363 sumq+=xxx(index*4+3);
1364 }
1365 Float_t CentralPad = (fTPCParam->GetNPads(isec,lastrow)-1)/2;
1366 Float_t det=currentIndex*(sumx2*sumx4-sumx3*sumx3)-sumx*(sumx*sumx4-sumx2*sumx3)+
1367 sumx2*(sumx*sumx3-sumx2*sumx2);
1368
1369 Float_t detay=sumy*(sumx2*sumx4-sumx3*sumx3)-sumx*(sumxy*sumx4-sumx2y*sumx3)+
1370 sumx2*(sumxy*sumx3-sumx2y*sumx2);
1371 Float_t detaz=sumz*(sumx2*sumx4-sumx3*sumx3)-sumx*(sumxz*sumx4-sumx2z*sumx3)+
1372 sumx2*(sumxz*sumx3-sumx2z*sumx2);
1373
1374 Float_t detby=currentIndex*(sumxy*sumx4-sumx2y*sumx3)-sumy*(sumx*sumx4-sumx2*sumx3)+
1375 sumx2*(sumx*sumx2y-sumx2*sumxy);
1376 Float_t detbz=currentIndex*(sumxz*sumx4-sumx2z*sumx3)-sumz*(sumx*sumx4-sumx2*sumx3)+
1377 sumx2*(sumx*sumx2z-sumx2*sumxz);
1378
1379 Float_t y=detay/det+CentralPad;
1380 Float_t z=detaz/det;
1381 Float_t by=detby/det; //y angle
1382 Float_t bz=detbz/det; //z angle
1383 sumy/=Float_t(currentIndex);
1384 sumz/=Float_t(currentIndex);
1385 AliCluster cl;
1386 cl.fX=z;
1387 cl.fY=y;
1388 cl.fQ=sumq;
1389 cl.fSigmaX2=bz;
1390 cl.fSigmaY2=by;
1391 cl.fTracks[0]=ipart;
1392
1393 AliTPCClustersRow * row = (fClustersArray->GetRow(isec,lastrow));
1394 if (row!=0) row->InsertCluster(&cl);
1395 currentIndex=0;
1396 lastrow=currentrow;
1397 } //end of calculating cluster for given row
1398
1399
1400
1401 } // end of loop over hits
1402 } // end of loop over tracks
1403 //write padrows to tree
1404 for (Int_t ii=0; ii<fTPCParam->GetNRow(isec);ii++) {
1405 fClustersArray->StoreRow(isec,ii);
1406 fClustersArray->ClearRow(isec,ii);
1407 }
1408 xxxx->Delete();
1409
fe4da5cc 1410}
1411
cc80f89e 1412//__________________________________________________________________
8c555625 1413void AliTPC::Hits2Digits()
1414{
8c555625 1415 //----------------------------------------------------
cc80f89e 1416 // Loop over all sectors
1417 //----------------------------------------------------
1418
1419 if(fTPCParam == 0){
1420 printf("AliTPCParam MUST be created firstly\n");
1421 return;
1422 }
1423
1424 for(Int_t isec=0;isec<fTPCParam->GetNSector();isec++) Hits2DigitsSector(isec);
1425
8c555625 1426}
1427
1428
fe4da5cc 1429//_____________________________________________________________________________
8c555625 1430void AliTPC::Hits2DigitsSector(Int_t isec)
fe4da5cc 1431{
8c555625 1432 //-------------------------------------------------------------------
fe4da5cc 1433 // TPC conversion from hits to digits.
8c555625 1434 //-------------------------------------------------------------------
1435
1436 //-----------------------------------------------------------------
1437 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
1438 //-----------------------------------------------------------------
1439
fe4da5cc 1440 //-------------------------------------------------------
8c555625 1441 // Get the access to the track hits
fe4da5cc 1442 //-------------------------------------------------------
8c555625 1443
cc80f89e 1444
8c555625 1445 TTree *TH = gAlice->TreeH(); // pointer to the hits tree
fe4da5cc 1446 Stat_t ntracks = TH->GetEntries();
8c555625 1447
1448 if( ntracks > 0){
1449
1450 //-------------------------------------------
1451 // Only if there are any tracks...
1452 //-------------------------------------------
1453
8c555625 1454 TObjArray **row;
fe4da5cc 1455
8c555625 1456 printf("*** Processing sector number %d ***\n",isec);
1457
1458 Int_t nrows =fTPCParam->GetNRow(isec);
1459
1460 row= new TObjArray* [nrows];
fe4da5cc 1461
8c555625 1462 MakeSector(isec,nrows,TH,ntracks,row);
1463
1464 //--------------------------------------------------------
1465 // Digitize this sector, row by row
1466 // row[i] is the pointer to the TObjArray of TVectors,
1467 // each one containing electrons accepted on this
1468 // row, assigned into tracks
1469 //--------------------------------------------------------
1470
1471 Int_t i;
1472
cc80f89e 1473 if (fDigitsArray->GetTree()==0) fDigitsArray->MakeTree();
8c555625 1474
cc80f89e 1475 for (i=0;i<nrows;i++){
8c555625 1476
cc80f89e 1477 AliDigits * dig = fDigitsArray->CreateRow(isec,i);
8c555625 1478
cc80f89e 1479 DigitizeRow(i,isec,row);
8c555625 1480
cc80f89e 1481 fDigitsArray->StoreRow(isec,i);
8c555625 1482
cc80f89e 1483 Int_t ndig = dig->GetSize();
1484
1485 printf("*** Sector, row, compressed digits %d %d %d ***\n",isec,i,ndig);
1486
1487 fDigitsArray->ClearRow(isec,i);
8c555625 1488
cc80f89e 1489
8c555625 1490 } // end of the sector digitization
8c555625 1491
cc80f89e 1492 for(i=0;i<nrows;i++){
1493 row[i]->Delete();
1494 }
1495
8c555625 1496 delete [] row; // delete the array of pointers to TObjArray-s
1497
1498 } // ntracks >0
8c555625 1499
cc80f89e 1500} // end of Hits2DigitsSector
8c555625 1501
8c555625 1502
8c555625 1503//_____________________________________________________________________________
cc80f89e 1504void AliTPC::DigitizeRow(Int_t irow,Int_t isec,TObjArray **rows)
8c555625 1505{
1506 //-----------------------------------------------------------
1507 // Single row digitization, coupling from the neighbouring
1508 // rows taken into account
1509 //-----------------------------------------------------------
1510
1511 //-----------------------------------------------------------------
1512 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
cc80f89e 1513 // Modified: Marian Ivanov GSI Darmstadt, m.ivanov@gsi.de
8c555625 1514 //-----------------------------------------------------------------
1515
1516
8c555625 1517 Float_t zerosup = fTPCParam->GetZeroSup();
1518 Int_t nrows =fTPCParam->GetNRow(isec);
cc80f89e 1519 fCurrentIndex[1]= isec;
8c555625 1520
8c555625 1521
cc80f89e 1522 Int_t n_of_pads = fTPCParam->GetNPads(isec,irow);
1523 Int_t n_of_tbins = fTPCParam->GetMaxTBin();
1524 Int_t IndexRange[4];
8c555625 1525 //
1526 // Integrated signal for this row
1527 // and a single track signal
cc80f89e 1528 //
1529 TMatrix *m1 = new TMatrix(0,n_of_pads,0,n_of_tbins); // integrated
1530 TMatrix *m2 = new TMatrix(0,n_of_pads,0,n_of_tbins); // single
8c555625 1531 //
8c555625 1532 TMatrix &Total = *m1;
1533
1534 // Array of pointers to the label-signal list
1535
cc80f89e 1536 Int_t NofDigits = n_of_pads*n_of_tbins; // number of digits for this row
8c555625 1537 Float_t **pList = new Float_t* [NofDigits];
1538
1539 Int_t lp;
cc80f89e 1540 Int_t i1;
8c555625 1541 for(lp=0;lp<NofDigits;lp++)pList[lp]=0; // set all pointers to NULL
8c555625 1542 //
cc80f89e 1543 //calculate signal
1544 //
1545 Int_t row1 = TMath::Max(irow-fTPCParam->GetNCrossRows(),0);
1546 Int_t row2 = TMath::Min(irow+fTPCParam->GetNCrossRows(),nrows-1);
1547 for (Int_t row= row1;row<=row2;row++){
1548 Int_t nTracks= rows[row]->GetEntries();
1549 for (i1=0;i1<nTracks;i1++){
1550 fCurrentIndex[2]= row;
1551 fCurrentIndex[3]=irow;
1552 if (row==irow){
1553 m2->Zero(); // clear single track signal matrix
1554 Float_t TrackLabel = GetSignal(rows[row],i1,m2,m1,IndexRange);
1555 GetList(TrackLabel,n_of_pads,m2,IndexRange,pList);
1556 }
1557 else GetSignal(rows[row],i1,0,m1,IndexRange);
1558 }
8c555625 1559 }
cc80f89e 1560
8c555625 1561 Int_t tracks[3];
8c555625 1562
cc80f89e 1563 AliDigits *dig = fDigitsArray->GetRow(isec,irow);
1564 for(Int_t ip=0;ip<n_of_pads;ip++){
1565 for(Int_t it=0;it<n_of_tbins;it++){
8c555625 1566
1567 Float_t q = Total(ip,it);
1568
cc80f89e 1569 Int_t gi =it*n_of_pads+ip; // global index
8c555625 1570
cc80f89e 1571 q = gRandom->Gaus(q,fTPCParam->GetNoise()*fTPCParam->GetNoiseNormFac());
8c555625 1572
cc80f89e 1573 q = (Int_t)q;
1574
1575 if(q <=zerosup) continue; // do not fill zeros
8c555625 1576 if(q > adc_sat) q = adc_sat; // saturation
1577
1578 //
1579 // "real" signal or electronic noise (list = -1)?
1580 //
1581
1582 for(Int_t j1=0;j1<3;j1++){
1583 tracks[j1] = (pList[gi]) ?(Int_t)(*(pList[gi]+j1)) : -1;
1584 }
1585
cc80f89e 1586//Begin_Html
1587/*
1588 <A NAME="AliDigits"></A>
1589 using of AliDigits object
1590*/
1591//End_Html
1592 dig->SetDigitFast((Short_t)q,it,ip);
1593 if (fDigitsArray->IsSimulated())
1594 {
1595 ((AliSimDigits*)dig)->SetTrackIDFast(tracks[0],it,ip,0);
1596 ((AliSimDigits*)dig)->SetTrackIDFast(tracks[1],it,ip,1);
1597 ((AliSimDigits*)dig)->SetTrackIDFast(tracks[2],it,ip,2);
1598 }
1599
8c555625 1600
1601 } // end of loop over time buckets
1602 } // end of lop over pads
1603
1604 //
1605 // This row has been digitized, delete nonused stuff
1606 //
1607
1608 for(lp=0;lp<NofDigits;lp++){
1609 if(pList[lp]) delete [] pList[lp];
1610 }
1611
1612 delete [] pList;
1613
1614 delete m1;
1615 delete m2;
cc80f89e 1616 // delete m3;
8c555625 1617
1618} // end of DigitizeRow
cc80f89e 1619
8c555625 1620//_____________________________________________________________________________
cc80f89e 1621
1622Float_t AliTPC::GetSignal(TObjArray *p1, Int_t ntr, TMatrix *m1, TMatrix *m2,
8c555625 1623 Int_t *IndexRange)
1624{
1625
1626 //---------------------------------------------------------------
1627 // Calculates 2-D signal (pad,time) for a single track,
1628 // returns a pointer to the signal matrix and the track label
1629 // No digitization is performed at this level!!!
1630 //---------------------------------------------------------------
1631
1632 //-----------------------------------------------------------------
1633 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
cc80f89e 1634 // Modified: Marian Ivanov
8c555625 1635 //-----------------------------------------------------------------
1636
1637 TVector *tv;
8c555625 1638
8c555625 1639 tv = (TVector*)p1->At(ntr); // pointer to a track
1640 TVector &v = *tv;
1641
1642 Float_t label = v(0);
cc80f89e 1643 Int_t CentralPad = (fTPCParam->GetNPads(fCurrentIndex[1],fCurrentIndex[3])-1)/2;
8c555625 1644
8c555625 1645 Int_t nElectrons = (tv->GetNrows()-1)/4;
8c555625 1646 IndexRange[0]=9999; // min pad
1647 IndexRange[1]=-1; // max pad
1648 IndexRange[2]=9999; //min time
1649 IndexRange[3]=-1; // max time
1650
cc80f89e 1651 // Float_t IneffFactor = 0.5; // inefficiency in the gain close to the edge, as above
1652
1653 TMatrix &signal = *m1;
1654 TMatrix &total = *m2;
8c555625 1655 //
1656 // Loop over all electrons
1657 //
8c555625 1658 for(Int_t nel=0; nel<nElectrons; nel++){
cc80f89e 1659 Int_t idx=nel*4;
1660 Float_t aval = v(idx+4);
1661 Float_t eltoadcfac=aval*fTPCParam->GetTotalNormFac();
1662 Float_t xyz[3]={v(idx+1),v(idx+2),v(idx+3)};
1663 Int_t n = fTPCParam->CalcResponse(xyz,fCurrentIndex,fCurrentIndex[3]);
8c555625 1664
cc80f89e 1665 if (n>0) for (Int_t i =0; i<n; i++){
1666 Int_t *index = fTPCParam->GetResBin(i);
1667 Int_t pad=index[1]+CentralPad; //in digit coordinates central pad has coordinate 0
1668 if ( ( pad<(fTPCParam->GetNPads(fCurrentIndex[1],fCurrentIndex[3]))) && (pad>0)) {
1669 Int_t time=index[2];
1670 Float_t weight = fTPCParam->GetResWeight(i); //we normalise response to ADC channel
1671 weight *= eltoadcfac;
1672
1673 if (m1!=0) signal(pad,time)+=weight;
1674 total(pad,time)+=weight;
1675 IndexRange[0]=TMath::Min(IndexRange[0],pad);
1676 IndexRange[1]=TMath::Max(IndexRange[1],pad);
1677 IndexRange[2]=TMath::Min(IndexRange[2],time);
1678 IndexRange[3]=TMath::Max(IndexRange[3],time);
1679 }
1680 }
8c555625 1681 } // end of loop over electrons
cc80f89e 1682
8c555625 1683 return label; // returns track label when finished
1684}
1685
1686//_____________________________________________________________________________
1687void AliTPC::GetList(Float_t label,Int_t np,TMatrix *m,Int_t *IndexRange,
1688 Float_t **pList)
1689{
1690 //----------------------------------------------------------------------
1691 // Updates the list of tracks contributing to digits for a given row
1692 //----------------------------------------------------------------------
1693
1694 //-----------------------------------------------------------------
1695 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
1696 //-----------------------------------------------------------------
1697
1698 TMatrix &signal = *m;
1699
1700 // lop over nonzero digits
1701
1702 for(Int_t it=IndexRange[2];it<IndexRange[3]+1;it++){
1703 for(Int_t ip=IndexRange[0];ip<IndexRange[1]+1;ip++){
1704
1705
921bf71a 1706 // accept only the contribution larger than 500 electrons (1/2 s_noise)
1707
cc80f89e 1708 if(signal(ip,it)<0.5) continue;
921bf71a 1709
1710
1283eee5 1711 Int_t GlobalIndex = it*np+ip; // GlobalIndex starts from 0!
8c555625 1712
1713 if(!pList[GlobalIndex]){
1714
1715 //
1716 // Create new list (6 elements - 3 signals and 3 labels),
8c555625 1717 //
1718
8c555625 1719 pList[GlobalIndex] = new Float_t [6];
1720
1721 // set list to -1
1722
1723 *pList[GlobalIndex] = -1.;
1724 *(pList[GlobalIndex]+1) = -1.;
1725 *(pList[GlobalIndex]+2) = -1.;
1726 *(pList[GlobalIndex]+3) = -1.;
1727 *(pList[GlobalIndex]+4) = -1.;
1728 *(pList[GlobalIndex]+5) = -1.;
1729
1730
1731 *pList[GlobalIndex] = label;
921bf71a 1732 *(pList[GlobalIndex]+3) = signal(ip,it);
8c555625 1733 }
1734 else{
1735
1736 // check the signal magnitude
1737
1738 Float_t highest = *(pList[GlobalIndex]+3);
1739 Float_t middle = *(pList[GlobalIndex]+4);
1740 Float_t lowest = *(pList[GlobalIndex]+5);
1741
1742 //
1743 // compare the new signal with already existing list
1744 //
1745
1746 if(signal(ip,it)<lowest) continue; // neglect this track
1747
1748 //
1749
1750 if (signal(ip,it)>highest){
1751 *(pList[GlobalIndex]+5) = middle;
1752 *(pList[GlobalIndex]+4) = highest;
1753 *(pList[GlobalIndex]+3) = signal(ip,it);
1754
1755 *(pList[GlobalIndex]+2) = *(pList[GlobalIndex]+1);
1756 *(pList[GlobalIndex]+1) = *pList[GlobalIndex];
1757 *pList[GlobalIndex] = label;
1758 }
1759 else if (signal(ip,it)>middle){
1760 *(pList[GlobalIndex]+5) = middle;
1761 *(pList[GlobalIndex]+4) = signal(ip,it);
1762
1763 *(pList[GlobalIndex]+2) = *(pList[GlobalIndex]+1);
1764 *(pList[GlobalIndex]+1) = label;
1765 }
1766 else{
1767 *(pList[GlobalIndex]+5) = signal(ip,it);
1768 *(pList[GlobalIndex]+2) = label;
1769 }
1770 }
1771
1772 } // end of loop over pads
1773 } // end of loop over time bins
1774
1775
1776
8c555625 1777}//end of GetList
1778//___________________________________________________________________
1779void AliTPC::MakeSector(Int_t isec,Int_t nrows,TTree *TH,
1780 Stat_t ntracks,TObjArray **row)
1781{
1782
1783 //-----------------------------------------------------------------
1784 // Prepares the sector digitization, creates the vectors of
1785 // tracks for each row of this sector. The track vector
1786 // contains the track label and the position of electrons.
1787 //-----------------------------------------------------------------
1788
1789 //-----------------------------------------------------------------
1790 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
1791 //-----------------------------------------------------------------
1792
cc80f89e 1793 Float_t gasgain = fTPCParam->GetGasGain();
8c555625 1794 Int_t i;
cc80f89e 1795 Float_t xyz[4];
8c555625 1796
1797 AliTPChit *tpcHit; // pointer to a sigle TPC hit
1798
1799 //----------------------------------------------
1800 // Create TObjArray-s, one for each row,
1801 // each TObjArray will store the TVectors
1802 // of electrons, one TVector per each track.
1803 //----------------------------------------------
1804
1805 for(i=0; i<nrows; i++){
1806 row[i] = new TObjArray;
1807 }
1808 Int_t *n_of_electrons = new Int_t [nrows]; // electron counter for each row
cc80f89e 1809 TVector **tracks = new TVector* [nrows]; //pointers to the track vectors
8c555625 1810
1811 //--------------------------------------------------------------------
1812 // Loop over tracks, the "track" contains the full history
1813 //--------------------------------------------------------------------
1814
1815 Int_t previousTrack,currentTrack;
1816 previousTrack = -1; // nothing to store so far!
1817
1818 for(Int_t track=0;track<ntracks;track++){
1819
1820 ResetHits();
1821
1822 TH->GetEvent(track); // get next track
1823 Int_t nhits = fHits->GetEntriesFast(); // get number of hits for this track
1824
1825 if(nhits == 0) continue; // no hits in the TPC for this track
1826
1827 //--------------------------------------------------------------
1828 // Loop over hits
1829 //--------------------------------------------------------------
1830
1831 for(Int_t hit=0;hit<nhits;hit++){
1832
1833 tpcHit = (AliTPChit*)fHits->UncheckedAt(hit); // get a pointer to a hit
1834
1835 Int_t sector=tpcHit->fSector; // sector number
cc80f89e 1836 if(sector != isec) continue;
8c555625 1837
1838 currentTrack = tpcHit->fTrack; // track number
1839 if(currentTrack != previousTrack){
1840
1841 // store already filled fTrack
1842
1843 for(i=0;i<nrows;i++){
1844 if(previousTrack != -1){
1845 if(n_of_electrons[i]>0){
cc80f89e 1846 TVector &v = *tracks[i];
8c555625 1847 v(0) = previousTrack;
cc80f89e 1848 tracks[i]->ResizeTo(4*n_of_electrons[i]+1); // shrink if necessary
1849 row[i]->Add(tracks[i]);
8c555625 1850 }
1851 else{
cc80f89e 1852 delete tracks[i]; // delete empty TVector
1853 tracks[i]=0;
8c555625 1854 }
1855 }
1856
1857 n_of_electrons[i]=0;
cc80f89e 1858 tracks[i] = new TVector(481); // TVectors for the next fTrack
8c555625 1859
1860 } // end of loop over rows
1861
1862 previousTrack=currentTrack; // update track label
1863 }
1864
1865 Int_t QI = (Int_t) (tpcHit->fQ); // energy loss (number of electrons)
1866
1867 //---------------------------------------------------
1868 // Calculate the electron attachment probability
1869 //---------------------------------------------------
1870
cc80f89e 1871
1872 Float_t time = 1.e6*(fTPCParam->GetZLength()-TMath::Abs(tpcHit->fZ))
1873 /fTPCParam->GetDriftV();
8c555625 1874 // in microseconds!
1875 Float_t AttProb = fTPCParam->GetAttCoef()*
1876 fTPCParam->GetOxyCont()*time; // fraction!
1877
1878 //-----------------------------------------------
1879 // Loop over electrons
1880 //-----------------------------------------------
cc80f89e 1881 Int_t index[3];
1882 index[1]=isec;
8c555625 1883 for(Int_t nel=0;nel<QI;nel++){
1884 // skip if electron lost due to the attachment
1885 if((gRandom->Rndm(0)) < AttProb) continue; // electron lost!
1886 xyz[0]=tpcHit->fX;
1887 xyz[1]=tpcHit->fY;
cc80f89e 1888 xyz[2]=tpcHit->fZ;
1889 xyz[3]= (Float_t) (-gasgain*TMath::Log(gRandom->Rndm()));
1890 index[0]=1;
1891
1892 TransportElectron(xyz,index); //MI change -august
8c555625 1893 Int_t row_number;
cc80f89e 1894 fTPCParam->GetPadRow(xyz,index); //MI change august
1895 row_number = index[2];
1896 //transform position to local digit coordinates
1897 //relative to nearest pad row
1898 if ((row_number<0)||row_number>=fTPCParam->GetNRow(isec)) continue;
8c555625 1899 n_of_electrons[row_number]++;
1900 //----------------------------------
1901 // Expand vector if necessary
1902 //----------------------------------
fe4da5cc 1903 if(n_of_electrons[row_number]>120){
cc80f89e 1904 Int_t range = tracks[row_number]->GetNrows();
1905 if((n_of_electrons[row_number])>(range-1)/4){
1906
1907 tracks[row_number]->ResizeTo(range+400); // Add 100 electrons
fe4da5cc 1908 }
1909 }
1910
cc80f89e 1911 TVector &v = *tracks[row_number];
1912 Int_t idx = 4*n_of_electrons[row_number]-3;
8c555625 1913
cc80f89e 1914 v(idx)= xyz[0]; // X - pad row coordinate
1915 v(idx+1)=xyz[1]; // Y - pad coordinate (along the pad-row)
1916 v(idx+2)=xyz[2]; // Z - time bin coordinate
1917 v(idx+3)=xyz[3]; // avalanche size
8c555625 1918 } // end of loop over electrons
1919
1920 } // end of loop over hits
1921 } // end of loop over tracks
1922
1923 //
1924 // store remaining track (the last one) if not empty
1925 //
1926
1927 for(i=0;i<nrows;i++){
1928 if(n_of_electrons[i]>0){
cc80f89e 1929 TVector &v = *tracks[i];
8c555625 1930 v(0) = previousTrack;
cc80f89e 1931 tracks[i]->ResizeTo(4*n_of_electrons[i]+1); // shrink if necessary
1932 row[i]->Add(tracks[i]);
fe4da5cc 1933 }
1934 else{
cc80f89e 1935 delete tracks[i];
1936 tracks[i]=0;
8c555625 1937 }
1938 }
1939
cc80f89e 1940 delete [] tracks;
1941 delete [] n_of_electrons;
8c555625 1942
8c555625 1943
cc80f89e 1944} // end of MakeSector
8c555625 1945
fe4da5cc 1946
1947//_____________________________________________________________________________
1948void AliTPC::Init()
1949{
1950 //
1951 // Initialise TPC detector after definition of geometry
1952 //
1953 Int_t i;
1954 //
1955 printf("\n");
1956 for(i=0;i<35;i++) printf("*");
1957 printf(" TPC_INIT ");
1958 for(i=0;i<35;i++) printf("*");
1959 printf("\n");
1960 //
1961 for(i=0;i<80;i++) printf("*");
1962 printf("\n");
1963}
1964
1965//_____________________________________________________________________________
1966void AliTPC::MakeBranch(Option_t* option)
1967{
1968 //
1969 // Create Tree branches for the TPC.
1970 //
1971 Int_t buffersize = 4000;
1972 char branchname[10];
1973 sprintf(branchname,"%s",GetName());
1974
1975 AliDetector::MakeBranch(option);
1976
1977 char *D = strstr(option,"D");
1978
1979 if (fDigits && gAlice->TreeD() && D) {
1980 gAlice->TreeD()->Branch(branchname,&fDigits, buffersize);
1981 printf("Making Branch %s for digits\n",branchname);
1982 }
1983
1984 char *R = strstr(option,"R");
1985
1986 if (fClusters && gAlice->TreeR() && R) {
1987 gAlice->TreeR()->Branch(branchname,&fClusters, buffersize);
1988 printf("Making Branch %s for Clusters\n",branchname);
1989 }
1990}
1991
1992//_____________________________________________________________________________
1993void AliTPC::ResetDigits()
1994{
1995 //
1996 // Reset number of digits and the digits array for this detector
1997 // reset clusters
1998 //
1999 fNdigits = 0;
cc80f89e 2000 if (fDigits) fDigits->Clear();
fe4da5cc 2001 fNclusters = 0;
2002 if (fClusters) fClusters->Clear();
2003}
2004
2005//_____________________________________________________________________________
2006void AliTPC::SetSecAL(Int_t sec)
2007{
8c555625 2008 //---------------------------------------------------
fe4da5cc 2009 // Activate/deactivate selection for lower sectors
8c555625 2010 //---------------------------------------------------
2011
2012 //-----------------------------------------------------------------
2013 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
2014 //-----------------------------------------------------------------
2015
fe4da5cc 2016 fSecAL = sec;
2017}
2018
2019//_____________________________________________________________________________
2020void AliTPC::SetSecAU(Int_t sec)
2021{
8c555625 2022 //----------------------------------------------------
fe4da5cc 2023 // Activate/deactivate selection for upper sectors
8c555625 2024 //---------------------------------------------------
2025
2026 //-----------------------------------------------------------------
2027 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
2028 //-----------------------------------------------------------------
2029
fe4da5cc 2030 fSecAU = sec;
2031}
2032
2033//_____________________________________________________________________________
2034void AliTPC::SetSecLows(Int_t s1,Int_t s2,Int_t s3,Int_t s4,Int_t s5, Int_t s6)
2035{
8c555625 2036 //----------------------------------------
fe4da5cc 2037 // Select active lower sectors
8c555625 2038 //----------------------------------------
2039
2040 //-----------------------------------------------------------------
2041 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
2042 //-----------------------------------------------------------------
2043
fe4da5cc 2044 fSecLows[0] = s1;
2045 fSecLows[1] = s2;
2046 fSecLows[2] = s3;
2047 fSecLows[3] = s4;
2048 fSecLows[4] = s5;
2049 fSecLows[5] = s6;
2050}
2051
2052//_____________________________________________________________________________
2053void AliTPC::SetSecUps(Int_t s1,Int_t s2,Int_t s3,Int_t s4,Int_t s5, Int_t s6,
2054 Int_t s7, Int_t s8 ,Int_t s9 ,Int_t s10,
2055 Int_t s11 , Int_t s12)
2056{
8c555625 2057 //--------------------------------
fe4da5cc 2058 // Select active upper sectors
8c555625 2059 //--------------------------------
2060
2061 //-----------------------------------------------------------------
2062 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
2063 //-----------------------------------------------------------------
2064
fe4da5cc 2065 fSecUps[0] = s1;
2066 fSecUps[1] = s2;
2067 fSecUps[2] = s3;
2068 fSecUps[3] = s4;
2069 fSecUps[4] = s5;
2070 fSecUps[5] = s6;
2071 fSecUps[6] = s7;
2072 fSecUps[7] = s8;
2073 fSecUps[8] = s9;
2074 fSecUps[9] = s10;
2075 fSecUps[10] = s11;
2076 fSecUps[11] = s12;
2077}
2078
2079//_____________________________________________________________________________
2080void AliTPC::SetSens(Int_t sens)
2081{
8c555625 2082
2083 //-------------------------------------------------------------
2084 // Activates/deactivates the sensitive strips at the center of
2085 // the pad row -- this is for the space-point resolution calculations
2086 //-------------------------------------------------------------
2087
2088 //-----------------------------------------------------------------
2089 // Origin: Marek Kowalski IFJ, Krakow, Marek.Kowalski@ifj.edu.pl
2090 //-----------------------------------------------------------------
2091
fe4da5cc 2092 fSens = sens;
2093}
4b0fdcad 2094
2095void AliTPC::SetSide(Float_t side)
2096{
2097 fSide = side;
2098
2099}
1283eee5 2100//____________________________________________________________________________
2101void AliTPC::SetGasMixt(Int_t nc,Int_t c1,Int_t c2,Int_t c3,Float_t p1,
2102 Float_t p2,Float_t p3)
2103{
fe4da5cc 2104
1283eee5 2105 fNoComp = nc;
2106
2107 fMixtComp[0]=c1;
2108 fMixtComp[1]=c2;
2109 fMixtComp[2]=c3;
2110
2111 fMixtProp[0]=p1;
2112 fMixtProp[1]=p2;
2113 fMixtProp[2]=p3;
2114
2115
cc80f89e 2116}
2117//_____________________________________________________________________________
2118
2119void AliTPC::TransportElectron(Float_t *xyz, Int_t *index)
2120{
2121 //
2122 // electron transport taking into account:
2123 // 1. diffusion,
2124 // 2.ExB at the wires
2125 // 3. nonisochronity
2126 //
2127 // xyz and index must be already transformed to system 1
2128 //
2129
2130 fTPCParam->Transform1to2(xyz,index);
2131
2132 //add diffusion
2133 Float_t driftl=xyz[2];
2134 if(driftl<0.01) driftl=0.01;
2135 driftl=TMath::Sqrt(driftl);
2136 Float_t sig_t = driftl*(fTPCParam->GetDiffT());
2137 Float_t sig_l = driftl*(fTPCParam->GetDiffL());
2138 xyz[0]=gRandom->Gaus(xyz[0],sig_t);
2139 xyz[1]=gRandom->Gaus(xyz[1],sig_t);
2140 xyz[2]=gRandom->Gaus(xyz[2],sig_l);
2141
2142 // ExB
2143
2144 if (fTPCParam->GetMWPCReadout()==kTRUE){
2145 Float_t x1=xyz[0];
2146 fTPCParam->Transform2to2NearestWire(xyz,index);
2147 Float_t dx=xyz[0]-x1;
2148 xyz[1]+=dx*(fTPCParam->GetOmegaTau());
2149 }
2150 //add nonisochronity (not implemented yet)
2151
1283eee5 2152}
fe4da5cc 2153//_____________________________________________________________________________
2154void AliTPC::Streamer(TBuffer &R__b)
2155{
2156 //
2157 // Stream an object of class AliTPC.
2158 //
2159 if (R__b.IsReading()) {
2160 Version_t R__v = R__b.ReadVersion(); if (R__v) { }
2161 AliDetector::Streamer(R__b);
2162 if (R__v < 2) return;
2163 R__b >> fNsectors;
2164 R__b >> fNclusters;
2165 R__b >> fNtracks;
cc80f89e 2166
fe4da5cc 2167 } else {
2168 R__b.WriteVersion(AliTPC::IsA());
2169 AliDetector::Streamer(R__b);
2170 R__b << fNsectors;
2171 R__b << fNclusters;
2172 R__b << fNtracks;
2173 }
2174}
2175
2176ClassImp(AliTPCcluster)
2177
2178//_____________________________________________________________________________
2179AliTPCcluster::AliTPCcluster(Float_t *hits, Int_t *lab)
2180{
2181 //
2182 // Creates a simulated cluster for the TPC
2183 //
2184 fTracks[0] = lab[0];
2185 fTracks[1] = lab[1];
2186 fTracks[2] = lab[2];
2187 fSector = lab[3];
2188 fPadRow = lab[4];
2189 fY = hits[0];
2190 fZ = hits[1];
2191 fQ = hits[2];
2192 fSigmaY2 = hits[3];
2193 fSigmaZ2 = hits[4];
2194}
2195
2196//_____________________________________________________________________________
8c555625 2197void AliTPCcluster::GetXYZ(Float_t *x, const AliTPCParam *par) const
fe4da5cc 2198{
2199 //
8c555625 2200 // Transformation from local to global coordinate system
fe4da5cc 2201 //
3c0f9266 2202 x[0]=par->GetPadRowRadii(fSector,fPadRow);
8c555625 2203 x[1]=fY;
2204 x[2]=fZ;
cc80f89e 2205 Float_t cs, sn, tmp;
2206 par->AdjustCosSin(fSector,cs,sn);
2207 tmp = x[0]*cs-x[1]*sn;
2208 x[1]= x[0]*sn+x[1]*cs; x[0]=tmp;
fe4da5cc 2209}
2210
8c555625 2211//_____________________________________________________________________________
2212Int_t AliTPCcluster::Compare(TObject * o)
2213{
2214 //
2215 // compare two clusters according y coordinata
3c0f9266 2216 //
8c555625 2217 AliTPCcluster *cl= (AliTPCcluster *)o;
2218 if (fY<cl->fY) return -1;
2219 if (fY==cl->fY) return 0;
2220 return 1;
2221}
2222
2223Bool_t AliTPCcluster::IsSortable() const
2224{
2225 //
2226 //make AliTPCcluster sortabale
3c0f9266 2227 //
8c555625 2228 return kTRUE;
2229}
2230
2231
2232
fe4da5cc 2233ClassImp(AliTPCdigit)
2234
2235//_____________________________________________________________________________
2236AliTPCdigit::AliTPCdigit(Int_t *tracks, Int_t *digits):
2237 AliDigit(tracks)
2238{
2239 //
2240 // Creates a TPC digit object
2241 //
2242 fSector = digits[0];
2243 fPadRow = digits[1];
2244 fPad = digits[2];
2245 fTime = digits[3];
2246 fSignal = digits[4];
2247}
2248
2249
2250ClassImp(AliTPChit)
2251
2252//_____________________________________________________________________________
2253AliTPChit::AliTPChit(Int_t shunt, Int_t track, Int_t *vol, Float_t *hits):
2254AliHit(shunt,track)
2255{
2256 //
2257 // Creates a TPC hit object
2258 //
2259 fSector = vol[0];
2260 fPadRow = vol[1];
2261 fX = hits[0];
2262 fY = hits[1];
2263 fZ = hits[2];
2264 fQ = hits[3];
2265}
2266
2267
2268ClassImp(AliTPCtrack)
2269
2270//_____________________________________________________________________________
2271AliTPCtrack::AliTPCtrack(Float_t *hits)
2272{
2273 //
2274 // Default creator for a TPC reconstructed track object
2275 //
3c0f9266 2276 fX=hits[0]; // This is dummy code !
fe4da5cc 2277}
cc80f89e 2278//_________________________________________________________________________
fe4da5cc 2279
3c0f9266 2280AliTPCtrack::AliTPCtrack(const AliTPCcluster *c,const TVector& xx,
2281 const TMatrix& CC, Double_t xref, Double_t alpha):
2282 x(xx),C(CC),fClusters(200)
fe4da5cc 2283{
3c0f9266 2284 //-----------------------------------------------------------------
2285 // This is the main track constructor.
fe4da5cc 2286 //
3c0f9266 2287 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
2288 //-----------------------------------------------------------------
2289 fX=xref;
2290 fAlpha=alpha;
2291 fChi2=0.;
2292 fClusters.AddLast((AliTPCcluster*)(c));
fe4da5cc 2293}
2294
2295//_____________________________________________________________________________
2296AliTPCtrack::AliTPCtrack(const AliTPCtrack& t) : x(t.x), C(t.C),
3c0f9266 2297 fClusters(t.fClusters.GetEntriesFast())
fe4da5cc 2298{
3c0f9266 2299 //-----------------------------------------------------------------
2300 // This is a track copy constructor.
fe4da5cc 2301 //
3c0f9266 2302 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
2303 //-----------------------------------------------------------------
2304 fX=t.fX;
2305 fChi2=t.fChi2;
fe4da5cc 2306 fAlpha=t.fAlpha;
cc80f89e 2307 Int_t n=t.fClusters.GetEntriesFast();
2308 for (Int_t i=0; i<n; i++) fClusters.AddLast(t.fClusters.UncheckedAt(i));
fe4da5cc 2309}
2310
2311//_____________________________________________________________________________
3c0f9266 2312Int_t AliTPCtrack::Compare(TObject *o) {
2313 //-----------------------------------------------------------------
cc80f89e 2314 // This function compares tracks according to the uncertainty of their
2315 // position in Y.
3c0f9266 2316 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
2317 //-----------------------------------------------------------------
2318 AliTPCtrack *t=(AliTPCtrack*)o;
2319 Double_t co=t->GetSigmaY2();
2320 Double_t c =GetSigmaY2();
2321 if (c>co) return 1;
2322 else if (c<co) return -1;
2323 return 0;
fe4da5cc 2324}
2325
2326//_____________________________________________________________________________
cc80f89e 2327Int_t AliTPCtrack::PropagateTo(Double_t xk,Double_t x0,Double_t rho,Double_t pm)
fe4da5cc 2328{
3c0f9266 2329 //-----------------------------------------------------------------
2330 // This function propagates a track to a reference plane x=xk.
fe4da5cc 2331 //
3c0f9266 2332 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
2333 //-----------------------------------------------------------------
fe4da5cc 2334 if (TMath::Abs(x(2)*xk - x(3)) >= 0.999) {
3c0f9266 2335 if (*this>4) cerr<<*this<<" AliTPCtrack warning: Propagation failed !\n";
fe4da5cc 2336 return 0;
2337 }
8c555625 2338
cc80f89e 2339 Double_t x1=fX, x2=x1+(xk-x1), dx=x2-x1, y1=x(0), z1=x(1);
fe4da5cc 2340 Double_t c1=x(2)*x1 - x(3), r1=sqrt(1.- c1*c1);
2341 Double_t c2=x(2)*x2 - x(3), r2=sqrt(1.- c2*c2);
2342
2343 x(0) += dx*(c1+c2)/(r1+r2);
2344 x(1) += dx*(c1+c2)/(c1*r2 + c2*r1)*x(4);
8c555625 2345
fe4da5cc 2346 TMatrix F(5,5); F.UnitMatrix();
2347 Double_t rr=r1+r2, cc=c1+c2, xx=x1+x2;
2348 F(0,2)= dx*(rr*xx + cc*(c1*x1/r1+c2*x2/r2))/(rr*rr);
2349 F(0,3)=-dx*(2*rr + cc*(c1/r1 + c2/r2))/(rr*rr);
2350 Double_t cr=c1*r2+c2*r1;
2351 F(1,2)= dx*x(4)*(cr*xx-cc*(r1*x2-c2*c1*x1/r1+r2*x1-c1*c2*x2/r2))/(cr*cr);
2352 F(1,3)=-dx*x(4)*(2*cr + cc*(c2*c1/r1-r1 + c1*c2/r2-r2))/(cr*cr);
2353 F(1,4)= dx*cc/cr;
2354 TMatrix tmp(F,TMatrix::kMult,C);
2355 C.Mult(tmp,TMatrix(TMatrix::kTransposed,F));
cc80f89e 2356
3c0f9266 2357 fX=x2;
cc80f89e 2358
fe4da5cc 2359 //Multiple scattering******************
3c0f9266 2360 Double_t ey=x(2)*fX - x(3);
fe4da5cc 2361 Double_t ex=sqrt(1-ey*ey);
2362 Double_t ez=x(4);
2363 TMatrix Q(5,5); Q=0.;
2364 Q(2,2)=ez*ez+ey*ey; Q(2,3)=-ex*ey; Q(2,4)=-ex*ez;
2365 Q(3,2)=Q(2,3); Q(3,3)= ez*ez+ex*ex; Q(3,4)=-ey*ez;
2366 Q(4,2)=Q(2,4); Q(4,3)= Q(3,4); Q(4,4)=1.;
2367
2368 F=0;
2369 F(2,2)=-x(2)*ex; F(2,3)=-x(2)*ey;
3c0f9266 2370 F(3,2)=-ex*(x(2)*fX-ey); F(3,3)=-(1.+ x(2)*fX*ey - ey*ey);
fe4da5cc 2371 F(4,2)=-ez*ex; F(4,3)=-ez*ey; F(4,4)=1.;
2372
2373 tmp.Mult(F,Q);
2374 Q.Mult(tmp,TMatrix(TMatrix::kTransposed,F));
2375
2376 Double_t p2=GetPt()*GetPt()*(1.+x(4)*x(4));
2377 Double_t beta2=p2/(p2 + pm*pm);
3c0f9266 2378 Double_t d=sqrt((x1-fX)*(x1-fX)+(y1-x(0))*(y1-x(0))+(z1-x(1))*(z1-x(1)));
fe4da5cc 2379 Double_t theta2=14.1*14.1/(beta2*p2*1e6)*d/x0*rho;
2380 Q*=theta2;
2381 C+=Q;
cc80f89e 2382
fe4da5cc 2383 //Energy losses************************
2384 Double_t dE=0.153e-3/beta2*(log(5940*beta2/(1-beta2)) - beta2)*d*rho;
2385 if (x1 < x2) dE=-dE;
2386 x(2)*=(1.- sqrt(p2+pm*pm)/p2*dE);
8c555625 2387 //x(3)*=(1.- sqrt(p2+pm*pm)/p2*dE);
cc80f89e 2388
fe4da5cc 2389 return 1;
2390}
2391
2392//_____________________________________________________________________________
2393void AliTPCtrack::PropagateToVertex(Double_t x0,Double_t rho,Double_t pm)
2394{
3c0f9266 2395 //-----------------------------------------------------------------
2396 // This function propagates tracks to the "vertex".
fe4da5cc 2397 //
3c0f9266 2398 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
2399 //-----------------------------------------------------------------
2400 Double_t c=x(2)*fX - x(3);
fe4da5cc 2401 Double_t tgf=-x(3)/(x(2)*x(0) + sqrt(1-c*c));
2402 Double_t snf=tgf/sqrt(1.+ tgf*tgf);
2403 Double_t xv=(x(3)+snf)/x(2);
2404 PropagateTo(xv,x0,rho,pm);
2405}
2406
2407//_____________________________________________________________________________
2408void AliTPCtrack::Update(const AliTPCcluster *c, Double_t chisq)
2409{
3c0f9266 2410 //-----------------------------------------------------------------
2411 // This function associates a clusters with this track.
fe4da5cc 2412 //
3c0f9266 2413 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
2414 //-----------------------------------------------------------------
fe4da5cc 2415 TMatrix H(2,5); H.UnitMatrix();
2416 TMatrix Ht(TMatrix::kTransposed,H);
2417 TVector m(2); m(0)=c->fY; m(1)=c->fZ;
2418 TMatrix V(2,2); V(0,0)=c->fSigmaY2; V(0,1)=0.; V(1,0)=0.; V(1,1)=c->fSigmaZ2;
2419
2420 TMatrix tmp(H,TMatrix::kMult,C);
2421 TMatrix R(tmp,TMatrix::kMult,Ht); R+=V;
2422
2423 Double_t det=(Double_t)R(0,0)*R(1,1) - (Double_t)R(0,1)*R(1,0);
2424 R(0,1)=R(0,0); R(0,0)=R(1,1); R(1,1)=R(0,1);
2425 R(1,0)*=-1; R(0,1)=R(1,0);
2426 R*=1./det;
2427
2428 //R.Invert();
2429
2430 TMatrix K(C,TMatrix::kMult,Ht); K*=R;
2431
2432 TVector savex=x;
cc80f89e 2433 x*=H; x-=m;
2434
2435 x*=-1; x*=K; x+=savex;
3c0f9266 2436 if (TMath::Abs(x(2)*fX-x(3)) >= 0.999) {
2437 if (*this>4) cerr<<*this<<" AliTPCtrack warning: Filtering failed !\n";
fe4da5cc 2438 x=savex;
2439 return;
2440 }
2441
2442 TMatrix saveC=C;
2443 C.Mult(K,tmp); C-=saveC; C*=-1;
cc80f89e 2444
3c0f9266 2445 fClusters.AddLast((AliTPCcluster*)c);
2446 fChi2 += chisq;
fe4da5cc 2447}
2448
2449//_____________________________________________________________________________
cc80f89e 2450Int_t AliTPCtrack::Rotate(Double_t alpha)
fe4da5cc 2451{
3c0f9266 2452 //-----------------------------------------------------------------
2453 // This function rotates this track.
fe4da5cc 2454 //
3c0f9266 2455 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
2456 //-----------------------------------------------------------------
fe4da5cc 2457 fAlpha += alpha;
2458
3c0f9266 2459 Double_t x1=fX, y1=x(0);
fe4da5cc 2460 Double_t ca=cos(alpha), sa=sin(alpha);
3c0f9266 2461 Double_t r1=x(2)*fX - x(3);
fe4da5cc 2462
3c0f9266 2463 fX = x1*ca + y1*sa;
fe4da5cc 2464 x(0)=-x1*sa + y1*ca;
2465 x(3)=x(3)*ca + (x(2)*y1 + sqrt(1.- r1*r1))*sa;
2466
3c0f9266 2467 Double_t r2=x(2)*fX - x(3);
fe4da5cc 2468 if (TMath::Abs(r2) >= 0.999) {
3c0f9266 2469 if (*this>4) cerr<<*this<<" AliTPCtrack warning: Rotation failed !\n";
fe4da5cc 2470 return 0;
2471 }
2472
2473 Double_t y0=x(0) + sqrt(1.- r2*r2)/x(2);
2474 if ((x(0)-y0)*x(2) >= 0.) {
3c0f9266 2475 if (*this>4) cerr<<*this<<" AliTPCtrack warning: Rotation failed !!!\n";
fe4da5cc 2476 return 0;
2477 }
2478
2479 TMatrix F(5,5); F.UnitMatrix();
2480 F(0,0)=ca;
2481 F(3,0)=x(2)*sa;
2482 F(3,2)=(y1 - r1*x1/sqrt(1.- r1*r1))*sa;
2483 F(3,3)= ca + sa*r1/sqrt(1.- r1*r1);
2484 TMatrix tmp(F,TMatrix::kMult,C);
2485 // Double_t dy2=C(0,0);
2486 C.Mult(tmp,TMatrix(TMatrix::kTransposed,F));
2487 // C(0,0)+=dy2*sa*sa*r1*r1/(1.- r1*r1);
2488 // C(1,1)+=dy2*sa*sa*x(4)*x(4)/(1.- r1*r1);
2489
2490 return 1;
2491}
2492
2493//_____________________________________________________________________________
2494void AliTPCtrack::UseClusters() const
2495{
3c0f9266 2496 //-----------------------------------------------------------------
2497 // This function marks clusters associated with this track.
fe4da5cc 2498 //
3c0f9266 2499 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
2500 //-----------------------------------------------------------------
cc80f89e 2501 Int_t num_of_clusters=fClusters.GetEntriesFast();
2502 for (Int_t i=0; i<num_of_clusters; i++) {
fe4da5cc 2503 //if (i<=14) continue;
3c0f9266 2504 AliTPCcluster *c=(AliTPCcluster*)fClusters.UncheckedAt(i);
fe4da5cc 2505 c->Use();
2506 }
2507}
2508
2509//_____________________________________________________________________________
2510Double_t AliTPCtrack::GetPredictedChi2(const AliTPCcluster *c) const
2511{
3c0f9266 2512 //-----------------------------------------------------------------
2513 // This function calculates a predicted chi2 increment.
fe4da5cc 2514 //
3c0f9266 2515 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
2516 //-----------------------------------------------------------------
fe4da5cc 2517 TMatrix H(2,5); H.UnitMatrix();
2518 TVector m(2); m(0)=c->fY; m(1)=c->fZ;
2519 TMatrix V(2,2); V(0,0)=c->fSigmaY2; V(0,1)=0.; V(1,0)=0.; V(1,1)=c->fSigmaZ2;
2520 TVector res=x; res*=H; res-=m; //res*=-1;
2521 TMatrix tmp(H,TMatrix::kMult,C);
2522 TMatrix R(tmp,TMatrix::kMult,TMatrix(TMatrix::kTransposed,H)); R+=V;
2523
2524 Double_t det=(Double_t)R(0,0)*R(1,1) - (Double_t)R(0,1)*R(1,0);
2525 if (TMath::Abs(det) < 1.e-10) {
3c0f9266 2526 if (*this>4) cerr<<*this<<" AliTPCtrack warning: Singular matrix !\n";
fe4da5cc 2527 return 1e10;
2528 }
2529 R(0,1)=R(0,0); R(0,0)=R(1,1); R(1,1)=R(0,1);
2530 R(1,0)*=-1; R(0,1)=R(1,0);
2531 R*=1./det;
2532
2533 //R.Invert();
2534
2535 TVector r=res;
2536 res*=R;
2537 return r*res;
2538}
2539
2540//_____________________________________________________________________________
cc80f89e 2541struct S { Int_t lab; Int_t max; };
2542Int_t AliTPCtrack::GetLabel(Int_t nrows) const
fe4da5cc 2543{
3c0f9266 2544 //-----------------------------------------------------------------
2545 // This function returns the track label. If label<0, this track is fake.
fe4da5cc 2546 //
3c0f9266 2547 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
2548 //-----------------------------------------------------------------
cc80f89e 2549 Int_t num_of_clusters=fClusters.GetEntriesFast();
3c0f9266 2550 S *s=new S[num_of_clusters];
cc80f89e 2551 Int_t i;
3c0f9266 2552 for (i=0; i<num_of_clusters; i++) s[i].lab=s[i].max=0;
2553
cc80f89e 2554 Int_t lab=123456789;
fe4da5cc 2555 for (i=0; i<num_of_clusters; i++) {
3c0f9266 2556 AliTPCcluster *c=(AliTPCcluster*)fClusters.UncheckedAt(i);
8c555625 2557 lab=TMath::Abs(c->fTracks[0]);
cc80f89e 2558 Int_t j;
3c0f9266 2559 for (j=0; j<num_of_clusters; j++)
fe4da5cc 2560 if (s[j].lab==lab || s[j].max==0) break;
2561 s[j].lab=lab;
2562 s[j].max++;
2563 }
2564
cc80f89e 2565 Int_t max=0;
fe4da5cc 2566 for (i=0; i<num_of_clusters; i++)
2567 if (s[i].max>max) {max=s[i].max; lab=s[i].lab;}
3c0f9266 2568
2569 delete[] s;
2570
8c555625 2571 for (i=0; i<num_of_clusters; i++) {
3c0f9266 2572 AliTPCcluster *c=(AliTPCcluster*)fClusters.UncheckedAt(i);
8c555625 2573 if (TMath::Abs(c->fTracks[1]) == lab ||
2574 TMath::Abs(c->fTracks[2]) == lab ) max++;
2575 }
fe4da5cc 2576
cc80f89e 2577 if (1.-Float_t(max)/num_of_clusters > 0.10) return -lab;
fe4da5cc 2578
cc80f89e 2579 Int_t tail=Int_t(0.08*nrows);
3c0f9266 2580 if (num_of_clusters < tail) return lab;
fe4da5cc 2581
2582 max=0;
3c0f9266 2583 for (i=1; i<=tail; i++) {
2584 AliTPCcluster *c=(AliTPCcluster*)fClusters.UncheckedAt(num_of_clusters-i);
8c555625 2585 if (lab == TMath::Abs(c->fTracks[0]) ||
2586 lab == TMath::Abs(c->fTracks[1]) ||
2587 lab == TMath::Abs(c->fTracks[2])) max++;
fe4da5cc 2588 }
cc80f89e 2589 if (max < Int_t(0.5*tail)) return -lab;
fe4da5cc 2590
2591 return lab;
2592}
2593
2594//_____________________________________________________________________________
2595void AliTPCtrack::GetPxPyPz(Double_t& px, Double_t& py, Double_t& pz) const
2596{
3c0f9266 2597 //-----------------------------------------------------------------
2598 // This function returns reconstructed track momentum in the global system.
fe4da5cc 2599 //
3c0f9266 2600 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
2601 //-----------------------------------------------------------------
2602 Double_t pt=TMath::Abs(GetPt()); // GeV/c
2603 Double_t r=x(2)*fX-x(3);
fe4da5cc 2604 Double_t y0=x(0) + sqrt(1.- r*r)/x(2);
2605 px=-pt*(x(0)-y0)*x(2); //cos(phi);
3c0f9266 2606 py=-pt*(x(3)-fX*x(2)); //sin(phi);
fe4da5cc 2607 pz=pt*x(4);
2608 Double_t tmp=px*TMath::Cos(fAlpha) - py*TMath::Sin(fAlpha);
2609 py=px*TMath::Sin(fAlpha) + py*TMath::Cos(fAlpha);
2610 px=tmp;
2611}
2612
2613//_____________________________________________________________________________
3c0f9266 2614Double_t AliTPCtrack::GetdEdX(Double_t low, Double_t up) const {
2615 //-----------------------------------------------------------------
2616 // This funtion calculates dE/dX within the "low" and "up" cuts.
fe4da5cc 2617 //
3c0f9266 2618 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
2619 //-----------------------------------------------------------------
cc80f89e 2620 Int_t ncl=fClusters.GetEntriesFast();
2621 Int_t n=0;
3c0f9266 2622 Double_t *q=new Double_t[ncl];
cc80f89e 2623 Int_t i;
2624 for (i=1; i<ncl; i++) { //Shall I think of this "i=1" ? (I.Belikov)
3c0f9266 2625 AliTPCcluster *cl=(AliTPCcluster*)(fClusters.UncheckedAt(i));
cc80f89e 2626 q[n++]=TMath::Abs(cl->fQ)/cl->fdEdX;
2627 if (cl->fSector<36) q[n-1]*=1.1;
3c0f9266 2628 }
2629
2630 //stupid sorting
cc80f89e 2631 Int_t swap;
3c0f9266 2632 do {
2633 swap=0;
2634 for (i=0; i<n-1; i++) {
2635 if (q[i]<=q[i+1]) continue;
2636 Double_t tmp=q[i]; q[i]=q[i+1]; q[i+1]=tmp;
2637 swap++;
2638 }
2639 } while (swap);
2640
cc80f89e 2641 Int_t nl=Int_t(low*n), nu=Int_t(up *n);
3c0f9266 2642 Double_t dedx=0.;
2643 for (i=nl; i<=nu; i++) dedx += q[i];
2644 dedx /= (nu-nl+1);
2645 return dedx;
2646}
2647
2648//_________________________________________________________________________
2649//
2650// Classes for internal tracking use
2651//_________________________________________________________________________
2652void AliTPCRow::InsertCluster(const AliTPCcluster* c) {
2653 //-----------------------------------------------------------------------
2654 // Insert a cluster into this pad row in accordence with its y-coordinate
2655 //
2656 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
2657 //-----------------------------------------------------------------------
fe4da5cc 2658 if (num_of_clusters==MAX_CLUSTER_PER_ROW) {
2659 cerr<<"AliTPCRow::InsertCluster(): Too many clusters !\n"; return;
2660 }
2661 if (num_of_clusters==0) {clusters[num_of_clusters++]=c; return;}
cc80f89e 2662 Int_t i=Find(c->fY);
fe4da5cc 2663 memmove(clusters+i+1 ,clusters+i,(num_of_clusters-i)*sizeof(AliTPCcluster*));
2664 clusters[i]=c; num_of_clusters++;
2665}
cc80f89e 2666//___________________________________________________________________
fe4da5cc 2667
cc80f89e 2668Int_t AliTPCRow::Find(Double_t y) const {
3c0f9266 2669 //-----------------------------------------------------------------------
2670 // Return the index of the nearest cluster
fe4da5cc 2671 //
3c0f9266 2672 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
2673 //-----------------------------------------------------------------------
fe4da5cc 2674 if (y <= clusters[0]->fY) return 0;
2675 if (y > clusters[num_of_clusters-1]->fY) return num_of_clusters;
cc80f89e 2676 Int_t b=0, e=num_of_clusters-1, m=(b+e)/2;
fe4da5cc 2677 for (; b<e; m=(b+e)/2) {
2678 if (y > clusters[m]->fY) b=m+1;
2679 else e=m;
2680 }
2681 return m;
2682}
cc80f89e 2683//________________________________________________________________________
8c555625 2684