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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/* $Id$ */
17
18///////////////////////////////////////////////////////////////////////////////
19// //
20// The standard TRD tracker //
21// //
22///////////////////////////////////////////////////////////////////////////////
23
24#include <Riostream.h>
25#include <TFile.h>
26#include <TBranch.h>
27#include <TTree.h>
28#include <TObjArray.h>
29
30#include "AliTRDgeometry.h"
31#include "AliTRDparameter.h"
32#include "AliTRDgeometryHole.h"
33#include "AliTRDcluster.h"
34#include "AliTRDtrack.h"
35#include "AliESD.h"
36
37#include "AliTRDtracker.h"
38
39ClassImp(AliTRDtracker)
40
41 const Float_t AliTRDtracker::fgkSeedDepth = 0.5;
42 const Float_t AliTRDtracker::fgkSeedStep = 0.10;
43 const Float_t AliTRDtracker::fgkSeedGap = 0.25;
44
45 const Float_t AliTRDtracker::fgkMaxSeedDeltaZ12 = 40.;
46 const Float_t AliTRDtracker::fgkMaxSeedDeltaZ = 25.;
47 const Float_t AliTRDtracker::fgkMaxSeedC = 0.0052;
48 const Float_t AliTRDtracker::fgkMaxSeedTan = 1.2;
49 const Float_t AliTRDtracker::fgkMaxSeedVertexZ = 150.;
50
51 const Double_t AliTRDtracker::fgkSeedErrorSY = 0.2;
52 const Double_t AliTRDtracker::fgkSeedErrorSY3 = 2.5;
53 const Double_t AliTRDtracker::fgkSeedErrorSZ = 0.1;
54
55 const Float_t AliTRDtracker::fgkMinClustersInSeed = 0.7;
56
57 const Float_t AliTRDtracker::fgkMinClustersInTrack = 0.5;
58 const Float_t AliTRDtracker::fgkMinFractionOfFoundClusters = 0.8;
59
60 const Float_t AliTRDtracker::fgkSkipDepth = 0.3;
61 const Float_t AliTRDtracker::fgkLabelFraction = 0.8;
62 const Float_t AliTRDtracker::fgkWideRoad = 20.;
63
64 const Double_t AliTRDtracker::fgkMaxChi2 = 12.;
65
66const Int_t AliTRDtracker::fgkFirstPlane = 5;
67const Int_t AliTRDtracker::fgkLastPlane = 17;
68
69
70//____________________________________________________________________
71AliTRDtracker::AliTRDtracker():AliTracker(),
72 fGeom(0),
73 fPar(0),
74 fNclusters(0),
75 fClusters(0),
76 fNseeds(0),
77 fSeeds(0),
78 fNtracks(0),
79 fTracks(0),
80 fSY2corr(0),
81 fSZ2corr(0),
82 fTimeBinsPerPlane(0),
83 fMaxGap(0),
84 fVocal(kFALSE),
85 fAddTRDseeds(kFALSE),
86 fNoTilt(kFALSE)
87{
88 // Default constructor
89
90 for(Int_t i=0;i<kTrackingSectors;i++) fTrSec[i]=0;
91 for(Int_t j=0;j<5;j++)
92 for(Int_t k=0;k<18;k++) fHoles[j][k]=kFALSE;
93}
94//____________________________________________________________________
95AliTRDtracker::AliTRDtracker(const TFile *geomfile):AliTracker()
96{
97 //
98 // Main constructor
99 //
100
101 //Float_t fTzero = 0;
102
103 fAddTRDseeds = kFALSE;
104 fGeom = NULL;
105 fNoTilt = kFALSE;
106
107 TDirectory *savedir=gDirectory;
108 TFile *in=(TFile*)geomfile;
109 if (!in->IsOpen()) {
110 printf("AliTRDtracker::AliTRDtracker(): geometry file is not open!\n");
111 printf(" DETAIL TRD geometry and DEFAULT TRD parameter will be used\n");
112 }
113 else {
114 in->cd();
115// in->ls();
116 fGeom = (AliTRDgeometry*) in->Get("TRDgeometry");
117 fPar = (AliTRDparameter*) in->Get("TRDparameter");
118// fGeom->Dump();
119 }
120
121 if(fGeom) {
122 // fTzero = geo->GetT0();
123 printf("Found geometry version %d on file \n", fGeom->IsVersion());
124 }
125 else {
126 printf("AliTRDtracker::AliTRDtracker(): can't find TRD geometry!\n");
127 //printf("The DETAIL TRD geometry will be used\n");
128 //fGeom = new AliTRDgeometryDetail();
129 fGeom = new AliTRDgeometryHole();
130 fGeom->SetPHOShole();
131 fGeom->SetRICHhole();
132 }
133
134 if (!fPar) {
135 printf("AliTRDtracker::AliTRDtracker(): can't find TRD parameter!\n");
136 printf("The DEFAULT TRD parameter will be used\n");
137 fPar = new AliTRDparameter();
138 }
139 fPar->ReInit();
140
141 savedir->cd();
142
143
144 // fGeom->SetT0(fTzero);
145
146 fNclusters = 0;
147 fClusters = new TObjArray(2000);
148 fNseeds = 0;
149 fSeeds = new TObjArray(2000);
150 fNtracks = 0;
151 fTracks = new TObjArray(1000);
152
153 for(Int_t geomS = 0; geomS < kTrackingSectors; geomS++) {
154 Int_t trS = CookSectorIndex(geomS);
155 fTrSec[trS] = new AliTRDtrackingSector(fGeom, geomS, fPar);
156 for (Int_t icham=0;icham<AliTRDgeometry::kNcham; icham++){
157 fHoles[icham][trS]=fGeom->IsHole(0,icham,geomS);
158 }
159 }
160
161 Float_t tiltAngle = TMath::Abs(fPar->GetTiltingAngle());
162 if(tiltAngle < 0.1) {
163 fNoTilt = kTRUE;
164 }
165
166 fSY2corr = 0.2;
167 fSZ2corr = 120.;
168
169 if(fNoTilt && (tiltAngle > 0.1)) fSY2corr = fSY2corr + tiltAngle * 0.05;
170
171
172 // calculate max gap on track
173
174 Double_t dxAmp = (Double_t) fGeom->CamHght(); // Amplification region
175 Double_t dxDrift = (Double_t) fGeom->CdrHght(); // Drift region
176
177 Double_t dx = (Double_t) fPar->GetTimeBinSize();
178 Int_t tbAmp = fPar->GetTimeBefore();
179 Int_t maxAmp = (Int_t) ((dxAmp+0.000001)/dx);
180 if(kTRUE) maxAmp = 0; // intentional until we change the parameter class
181 Int_t tbDrift = fPar->GetTimeMax();
182 Int_t maxDrift = (Int_t) ((dxDrift+0.000001)/dx);
183
184 tbDrift = TMath::Min(tbDrift,maxDrift);
185 tbAmp = TMath::Min(tbAmp,maxAmp);
186
187 fTimeBinsPerPlane = tbAmp + tbDrift;
188 fMaxGap = (Int_t) (fTimeBinsPerPlane * fGeom->Nplan() * fgkSkipDepth);
189
190 fVocal = kFALSE;
191
192 savedir->cd();
193}
194
195//___________________________________________________________________
196AliTRDtracker::~AliTRDtracker()
197{
198 //
199 // Destructor of AliTRDtracker
200 //
201
202 if (fClusters) {
203 fClusters->Delete();
204 delete fClusters;
205 }
206 if (fTracks) {
207 fTracks->Delete();
208 delete fTracks;
209 }
210 if (fSeeds) {
211 fSeeds->Delete();
212 delete fSeeds;
213 }
214 delete fGeom;
215 delete fPar;
216
217 for(Int_t geomS = 0; geomS < kTrackingSectors; geomS++) {
218 delete fTrSec[geomS];
219 }
220}
221
222//_____________________________________________________________________
223
224Bool_t AliTRDtracker::AdjustSector(AliTRDtrack *track) {
225 //
226 // Rotates the track when necessary
227 //
228
229 Double_t alpha = AliTRDgeometry::GetAlpha();
230 Double_t y = track->GetY();
231 Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha);
232
233 //Int_t ns = AliTRDgeometry::kNsect;
234 //Int_t s=Int_t(track->GetAlpha()/alpha)%ns;
235
236 if (y > ymax) {
237 //s = (s+1) % ns;
238 if (!track->Rotate(alpha)) return kFALSE;
239 } else if (y <-ymax) {
240 //s = (s-1+ns) % ns;
241 if (!track->Rotate(-alpha)) return kFALSE;
242 }
243
244 return kTRUE;
245}
246
247//_____________________________________________________________________
248inline Double_t f1trd(Double_t x1,Double_t y1,
249 Double_t x2,Double_t y2,
250 Double_t x3,Double_t y3)
251{
252 //
253 // Initial approximation of the track curvature
254 //
255 Double_t d=(x2-x1)*(y3-y2)-(x3-x2)*(y2-y1);
256 Double_t a=0.5*((y3-y2)*(y2*y2-y1*y1+x2*x2-x1*x1)-
257 (y2-y1)*(y3*y3-y2*y2+x3*x3-x2*x2));
258 Double_t b=0.5*((x2-x1)*(y3*y3-y2*y2+x3*x3-x2*x2)-
259 (x3-x2)*(y2*y2-y1*y1+x2*x2-x1*x1));
260
261 Double_t xr=TMath::Abs(d/(d*x1-a)), yr=d/(d*y1-b);
262
263 return -xr*yr/sqrt(xr*xr+yr*yr);
264}
265
266//_____________________________________________________________________
267inline Double_t f2trd(Double_t x1,Double_t y1,
268 Double_t x2,Double_t y2,
269 Double_t x3,Double_t y3)
270{
271 //
272 // Initial approximation of the track curvature times X coordinate
273 // of the center of curvature
274 //
275
276 Double_t d=(x2-x1)*(y3-y2)-(x3-x2)*(y2-y1);
277 Double_t a=0.5*((y3-y2)*(y2*y2-y1*y1+x2*x2-x1*x1)-
278 (y2-y1)*(y3*y3-y2*y2+x3*x3-x2*x2));
279 Double_t b=0.5*((x2-x1)*(y3*y3-y2*y2+x3*x3-x2*x2)-
280 (x3-x2)*(y2*y2-y1*y1+x2*x2-x1*x1));
281
282 Double_t xr=TMath::Abs(d/(d*x1-a)), yr=d/(d*y1-b);
283
284 return -a/(d*y1-b)*xr/sqrt(xr*xr+yr*yr);
285}
286
287//_____________________________________________________________________
288inline Double_t f3trd(Double_t x1,Double_t y1,
289 Double_t x2,Double_t y2,
290 Double_t z1,Double_t z2)
291{
292 //
293 // Initial approximation of the tangent of the track dip angle
294 //
295
296 return (z1 - z2)/sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
297}
298
299
300AliTRDcluster * AliTRDtracker::GetCluster(AliTRDtrack * track, Int_t plane, Int_t timebin){
301 //
302 //try to find cluster in the backup list
303 //
304 AliTRDcluster * cl =0;
305 UInt_t *indexes = track->GetBackupIndexes();
306 for (UInt_t i=0;i<kMaxTimeBinIndex;i++){
307 if (indexes[i]==0) break;
308 AliTRDcluster * cli = (AliTRDcluster*)fClusters->UncheckedAt(indexes[i]);
309 if (!cli) break;
310 if (cli->GetLocalTimeBin()!=timebin) continue;
311 Int_t iplane = fGeom->GetPlane(cli->GetDetector());
312 if (iplane==plane) {
313 cl = cli;
314 break;
315 }
316 }
317 return cl;
318}
319
320
321Int_t AliTRDtracker::GetLastPlane(AliTRDtrack * track){
322 //
323 //return last updated plane
324 Int_t lastplane=0;
325 UInt_t *indexes = track->GetBackupIndexes();
326 for (UInt_t i=0;i<kMaxTimeBinIndex;i++){
327 AliTRDcluster * cli = (AliTRDcluster*)fClusters->UncheckedAt(indexes[i]);
328 if (!cli) break;
329 Int_t iplane = fGeom->GetPlane(cli->GetDetector());
330 if (iplane>lastplane) {
331 lastplane = iplane;
332 }
333 }
334 return lastplane;
335}
336//___________________________________________________________________
337Int_t AliTRDtracker::Clusters2Tracks(AliESD* event)
338{
339 //
340 // Finds tracks within the TRD. The ESD event is expected to contain seeds
341 // at the outer part of the TRD. The seeds
342 // are found within the TRD if fAddTRDseeds is TRUE.
343 // The tracks are propagated to the innermost time bin
344 // of the TRD and the ESD event is updated
345 //
346
347 Int_t timeBins = fTrSec[0]->GetNumberOfTimeBins();
348 Float_t foundMin = fgkMinClustersInTrack * timeBins;
349 Int_t nseed = 0;
350 Int_t found = 0;
351 Int_t innerTB = fTrSec[0]->GetInnerTimeBin();
352
353 Int_t n = event->GetNumberOfTracks();
354 for (Int_t i=0; i<n; i++) {
355 AliESDtrack* seed=event->GetTrack(i);
356 ULong_t status=seed->GetStatus();
357 if ( (status & AliESDtrack::kTRDout ) == 0 ) continue;
358 if ( (status & AliESDtrack::kTRDin) != 0 ) continue;
359 nseed++;
360
361 AliTRDtrack* seed2 = new AliTRDtrack(*seed);
362 //seed2->ResetCovariance();
363 AliTRDtrack *pt = new AliTRDtrack(*seed2,seed2->GetAlpha());
364 AliTRDtrack &t=*pt;
365 FollowProlongation(t, innerTB);
366 if (t.GetNumberOfClusters() >= foundMin) {
367 UseClusters(&t);
368 CookLabel(pt, 1-fgkLabelFraction);
369 // t.CookdEdx();
370 }
371 found++;
372// cout<<found<<'\r';
373
374 if(PropagateToTPC(t)) {
375 seed->UpdateTrackParams(pt, AliESDtrack::kTRDin);
376 }
377 delete seed2;
378 delete pt;
379 }
380
381 cout<<"Number of loaded seeds: "<<nseed<<endl;
382 cout<<"Number of found tracks from loaded seeds: "<<found<<endl;
383
384 // after tracks from loaded seeds are found and the corresponding
385 // clusters are used, look for additional seeds from TRD
386
387 if(fAddTRDseeds) {
388 // Find tracks for the seeds in the TRD
389 Int_t timeBins = fTrSec[0]->GetNumberOfTimeBins();
390
391 Int_t nSteps = (Int_t) (fgkSeedDepth / fgkSeedStep);
392 Int_t gap = (Int_t) (timeBins * fgkSeedGap);
393 Int_t step = (Int_t) (timeBins * fgkSeedStep);
394
395 // make a first turn with tight cut on initial curvature
396 for(Int_t turn = 1; turn <= 2; turn++) {
397 if(turn == 2) {
398 nSteps = (Int_t) (fgkSeedDepth / (3*fgkSeedStep));
399 step = (Int_t) (timeBins * (3*fgkSeedStep));
400 }
401 for(Int_t i=0; i<nSteps; i++) {
402 Int_t outer=timeBins-1-i*step;
403 Int_t inner=outer-gap;
404
405 nseed=fSeeds->GetEntriesFast();
406
407 MakeSeeds(inner, outer, turn);
408
409 nseed=fSeeds->GetEntriesFast();
410 // printf("\n turn %d, step %d: number of seeds for TRD inward %d\n",
411 // turn, i, nseed);
412
413 for (Int_t i=0; i<nseed; i++) {
414 AliTRDtrack *pt=(AliTRDtrack*)fSeeds->UncheckedAt(i), &t=*pt;
415 FollowProlongation(t,innerTB);
416 if (t.GetNumberOfClusters() >= foundMin) {
417 UseClusters(&t);
418 CookLabel(pt, 1-fgkLabelFraction);
419 t.CookdEdx();
420 found++;
421// cout<<found<<'\r';
422 if(PropagateToTPC(t)) {
423 AliESDtrack track;
424 track.UpdateTrackParams(pt,AliESDtrack::kTRDin);
425 event->AddTrack(&track);
426 // track.SetTRDtrack(new AliTRDtrack(*pt));
427 }
428 }
429 delete fSeeds->RemoveAt(i);
430 fNseeds--;
431 }
432 }
433 }
434 }
435
436 cout<<"Total number of found tracks: "<<found<<endl;
437
438 return 0;
439}
440
441
442
443//_____________________________________________________________________________
444Int_t AliTRDtracker::PropagateBack(AliESD* event) {
445 //
446 // Gets seeds from ESD event. The seeds are AliTPCtrack's found and
447 // backpropagated by the TPC tracker. Each seed is first propagated
448 // to the TRD, and then its prolongation is searched in the TRD.
449 // If sufficiently long continuation of the track is found in the TRD
450 // the track is updated, otherwise it's stored as originaly defined
451 // by the TPC tracker.
452 //
453
454 Int_t found=0;
455 Float_t foundMin = 20;
456
457 Int_t n = event->GetNumberOfTracks();
458 for (Int_t i=0; i<n; i++) {
459 AliESDtrack* seed=event->GetTrack(i);
460 ULong_t status=seed->GetStatus();
461 if ( (status & AliESDtrack::kTPCout ) == 0 ) continue;
462 if ( (status & AliESDtrack::kTRDout) != 0 ) continue;
463
464 Int_t lbl = seed->GetLabel();
465 AliTRDtrack *track = new AliTRDtrack(*seed);
466 track->SetSeedLabel(lbl);
467 seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup); //make backup
468 fNseeds++;
469 Float_t p4 = track->GetC();
470 //
471 Int_t expectedClr = FollowBackProlongation(*track);
472 /*
473 // only debug purpose
474 if (track->GetNumberOfClusters()<expectedClr/3){
475 AliTRDtrack *track1 = new AliTRDtrack(*seed);
476 track1->SetSeedLabel(lbl);
477 FollowBackProlongation(*track1);
478 AliTRDtrack *track2= new AliTRDtrack(*seed);
479 track->SetSeedLabel(lbl);
480 FollowBackProlongation(*track2);
481 delete track1;
482 delete track2;
483 }
484 */
485 if (TMath::Abs(track->GetC()-p4)/TMath::Abs(p4)>0.2) {
486 delete track;
487 continue; //too big change of curvature - to be checked
488 }
489
490 Int_t foundClr = track->GetNumberOfClusters();
491 if (foundClr >= foundMin) {
492 track->CookdEdx(0.,1.);
493 CookdEdxTimBin(*track);
494
495 CookLabel(track, 1-fgkLabelFraction);
496 if(track->GetChi2()/track->GetNumberOfClusters()<6) { // sign only gold tracks
497 UseClusters(track);
498 }
499 Bool_t isGold = kFALSE;
500
501 if (track->GetChi2()/track->GetNumberOfClusters()<5) { //full gold track
502 seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup);
503 isGold = kTRUE;
504 }
505 if (!isGold && track->GetNCross()==0&&track->GetChi2()/track->GetNumberOfClusters()<7){ //almost gold track
506 seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup);
507 isGold = kTRUE;
508 }
509 if (!isGold && track->GetBackupTrack()){
510 if (track->GetBackupTrack()->GetNumberOfClusters()>foundMin&&
511 (track->GetBackupTrack()->GetChi2()/(track->GetBackupTrack()->GetNumberOfClusters()+1))<7){
512 seed->UpdateTrackParams(track->GetBackupTrack(), AliESDtrack::kTRDbackup);
513 isGold = kTRUE;
514 }
515 }
516 }
517 else{
518 delete track;
519 continue;
520 }
521
522
523 if (track->GetStop()==kFALSE){
524
525 Double_t xtof=371.;
526 Double_t c2=track->GetC()*xtof - track->GetEta();
527 if (TMath::Abs(c2)>=0.85) {
528 delete track;
529 continue;
530 }
531 Double_t xTOF0 = 371. ;
532 PropagateToOuterPlane(*track,xTOF0);
533 //
534 Double_t ymax=xtof*TMath::Tan(0.5*AliTRDgeometry::GetAlpha());
535 Double_t y=track->GetYat(xtof);
536 if (y > ymax) {
537 if (!track->Rotate(AliTRDgeometry::GetAlpha())) {
538 delete track;
539 continue;
540 }
541 } else if (y <-ymax) {
542 if (!track->Rotate(-AliTRDgeometry::GetAlpha())) {
543 delete track;
544 continue;
545 }
546 }
547
548 if (track->PropagateTo(xtof)) {
549 seed->UpdateTrackParams(track, AliESDtrack::kTRDout);
550 for (Int_t i=0;i<kNPlane;i++) {
551 seed->SetTRDsignals(track->GetPIDsignals(i),i);
552 seed->SetTRDTimBin(track->GetPIDTimBin(i),i);
553 }
554 seed->SetTRDtrack(new AliTRDtrack(*track));
555 if (track->GetNumberOfClusters()>foundMin) found++;
556 }
557 }else{
558 if (track->GetNumberOfClusters()>15&&track->GetNumberOfClusters()>0.5*expectedClr){
559 seed->UpdateTrackParams(track, AliESDtrack::kTRDout);
560 //seed->SetStatus(AliESDtrack::kTRDStop);
561 for (Int_t i=0;i<kNPlane;i++) {
562 seed->SetTRDsignals(track->GetPIDsignals(i),i);
563 seed->SetTRDTimBin(track->GetPIDTimBin(i),i);
564 }
565 seed->SetTRDtrack(new AliTRDtrack(*track));
566 found++;
567 }
568 }
569
570 delete track;
571
572 //End of propagation to the TOF
573 //if (foundClr>foundMin)
574 // seed->UpdateTrackParams(track, AliESDtrack::kTRDout);
575
576
577 }
578
579 cerr<<"Number of seeds: "<<fNseeds<<endl;
580 cerr<<"Number of back propagated TRD tracks: "<<found<<endl;
581
582 fSeeds->Clear(); fNseeds=0;
583
584 return 0;
585
586}
587
588//_____________________________________________________________________________
589Int_t AliTRDtracker::RefitInward(AliESD* event)
590{
591 //
592 // Refits tracks within the TRD. The ESD event is expected to contain seeds
593 // at the outer part of the TRD.
594 // The tracks are propagated to the innermost time bin
595 // of the TRD and the ESD event is updated
596 // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch)
597 //
598
599 Int_t timeBins = fTrSec[0]->GetNumberOfTimeBins();
600 Float_t foundMin = fgkMinClustersInTrack * timeBins;
601 Int_t nseed = 0;
602 Int_t found = 0;
603 Int_t innerTB = fTrSec[0]->GetInnerTimeBin();
604
605 Int_t n = event->GetNumberOfTracks();
606 for (Int_t i=0; i<n; i++) {
607 AliESDtrack* seed=event->GetTrack(i);
608 AliTRDtrack* seed2 = new AliTRDtrack(*seed);
609 if (seed2->GetX()<270){
610 seed->UpdateTrackParams(seed2, AliESDtrack::kTRDbackup); // backup TPC track - only update
611 delete seed2;
612 continue;
613 }
614
615 ULong_t status=seed->GetStatus();
616 if ( (status & AliESDtrack::kTRDout ) == 0 ) {
617 delete seed2;
618 continue;
619 }
620 if ( (status & AliESDtrack::kTRDin) != 0 ) {
621 delete seed2;
622 continue;
623 }
624 nseed++;
625 seed2->ResetCovariance(5.);
626 AliTRDtrack *pt = new AliTRDtrack(*seed2,seed2->GetAlpha());
627 for (Int_t i=0;i<kNPlane;i++) {
628 pt->SetPIDsignals(seed2->GetPIDsignals(i),i);
629 pt->SetPIDTimBin(seed2->GetPIDTimBin(i),i);
630 }
631
632 UInt_t * indexes2 = seed2->GetIndexes();
633 UInt_t * indexes3 = pt->GetBackupIndexes();
634 for (Int_t i=0;i<200;i++) {
635 if (indexes2[i]==0) break;
636 indexes3[i] = indexes2[i];
637 }
638 //AliTRDtrack *pt = seed2;
639 AliTRDtrack &t=*pt;
640 FollowProlongation(t, innerTB);
641 /*
642 if (t.GetNumberOfClusters()<seed->GetTRDclusters(indexes3)*0.5){
643 // debug - why we dont go back?
644 AliTRDtrack *pt2 = new AliTRDtrack(*seed2,seed2->GetAlpha());
645 UInt_t * indexes2 = seed2->GetIndexes();
646 UInt_t * indexes3 = pt2->GetBackupIndexes();
647 for (Int_t i=0;i<200;i++) {
648 if (indexes2[i]==0) break;
649 indexes3[i] = indexes2[i];
650 }
651 FollowProlongation(*pt2, innerTB);
652 delete pt2;
653 }
654 */
655 if (t.GetNumberOfClusters() >= foundMin) {
656 // UseClusters(&t);
657 //CookLabel(pt, 1-fgkLabelFraction);
658 // t.CookdEdx();
659 }
660 found++;
661// cout<<found<<'\r';
662
663 if(PropagateToTPC(t)) {
664 seed->UpdateTrackParams(pt, AliESDtrack::kTRDrefit);
665 for (Int_t i=0;i<kNPlane;i++) {
666 seed->SetTRDsignals(pt->GetPIDsignals(i),i);
667 seed->SetTRDTimBin(pt->GetPIDTimBin(i),i);
668 }
669 }else{
670 //if not prolongation to TPC - propagate without update
671 AliTRDtrack* seed2 = new AliTRDtrack(*seed);
672 seed2->ResetCovariance(5.);
673 AliTRDtrack *pt2 = new AliTRDtrack(*seed2,seed2->GetAlpha());
674 delete seed2;
675 if (PropagateToTPC(*pt2)) {
676 pt2->CookdEdx(0.,1.);
677 CookdEdxTimBin(*pt2);
678 seed->UpdateTrackParams(pt2, AliESDtrack::kTRDrefit);
679 for (Int_t i=0;i<kNPlane;i++) {
680 seed->SetTRDsignals(pt2->GetPIDsignals(i),i);
681 seed->SetTRDTimBin(pt2->GetPIDTimBin(i),i);
682 }
683 }
684 delete pt2;
685 }
686
687 delete seed2;
688 delete pt;
689 }
690
691 cout<<"Number of loaded seeds: "<<nseed<<endl;
692 cout<<"Number of found tracks from loaded seeds: "<<found<<endl;
693
694 return 0;
695
696}
697
698
699//---------------------------------------------------------------------------
700Int_t AliTRDtracker::FollowProlongation(AliTRDtrack& t, Int_t rf)
701{
702 // Starting from current position on track=t this function tries
703 // to extrapolate the track up to timeBin=0 and to confirm prolongation
704 // if a close cluster is found. Returns the number of clusters
705 // expected to be found in sensitive layers
706
707 Float_t wIndex, wTB, wChi2;
708 Float_t wYrt, wYclosest, wYcorrect, wYwindow;
709 Float_t wZrt, wZclosest, wZcorrect, wZwindow;
710 Float_t wPx, wPy, wPz, wC;
711 Double_t px, py, pz;
712 Float_t wSigmaC2, wSigmaTgl2, wSigmaY2, wSigmaZ2;
713 Int_t lastplane = GetLastPlane(&t);
714
715 Int_t trackIndex = t.GetLabel();
716
717 Int_t ns=Int_t(2*TMath::Pi()/AliTRDgeometry::GetAlpha()+0.5);
718
719 Int_t tryAgain=fMaxGap;
720
721 Double_t alpha=t.GetAlpha();
722 alpha = TVector2::Phi_0_2pi(alpha);
723
724 Int_t s=Int_t(alpha/AliTRDgeometry::GetAlpha())%AliTRDgeometry::kNsect;
725 Double_t radLength, rho, x, dx, y, ymax, z;
726
727 Int_t expectedNumberOfClusters = 0;
728 Bool_t lookForCluster;
729
730 alpha=AliTRDgeometry::GetAlpha(); // note: change in meaning
731
732
733 for (Int_t nr=fTrSec[0]->GetLayerNumber(t.GetX()); nr>rf; nr--) {
734
735 y = t.GetY(); z = t.GetZ();
736
737 // first propagate to the inner surface of the current time bin
738 fTrSec[s]->GetLayer(nr)->GetPropagationParameters(y,z,dx,rho,radLength,lookForCluster);
739 x = fTrSec[s]->GetLayer(nr)->GetX()-dx/2; y = t.GetY(); z = t.GetZ();
740 if(!t.PropagateTo(x,radLength,rho)) break;
741 y = t.GetY();
742 ymax = x*TMath::Tan(0.5*alpha);
743 if (y > ymax) {
744 s = (s+1) % ns;
745 if (!t.Rotate(alpha)) break;
746 if(!t.PropagateTo(x,radLength,rho)) break;
747 } else if (y <-ymax) {
748 s = (s-1+ns) % ns;
749 if (!t.Rotate(-alpha)) break;
750 if(!t.PropagateTo(x,radLength,rho)) break;
751 }
752
753 y = t.GetY(); z = t.GetZ();
754
755 // now propagate to the middle plane of the next time bin
756 fTrSec[s]->GetLayer(nr-1)->GetPropagationParameters(y,z,dx,rho,radLength,lookForCluster);
757 x = fTrSec[s]->GetLayer(nr-1)->GetX(); y = t.GetY(); z = t.GetZ();
758 if(!t.PropagateTo(x,radLength,rho)) break;
759 y = t.GetY();
760 ymax = x*TMath::Tan(0.5*alpha);
761 if (y > ymax) {
762 s = (s+1) % ns;
763 if (!t.Rotate(alpha)) break;
764 if(!t.PropagateTo(x,radLength,rho)) break;
765 } else if (y <-ymax) {
766 s = (s-1+ns) % ns;
767 if (!t.Rotate(-alpha)) break;
768 if(!t.PropagateTo(x,radLength,rho)) break;
769 }
770
771
772 if(lookForCluster) {
773
774 expectedNumberOfClusters++;
775 wIndex = (Float_t) t.GetLabel();
776 wTB = nr;
777
778 AliTRDpropagationLayer& timeBin=*(fTrSec[s]->GetLayer(nr-1));
779
780 Double_t sy2=ExpectedSigmaY2(x,t.GetTgl(),t.GetPt());
781 Double_t sz2=ExpectedSigmaZ2(x,t.GetTgl());
782
783 Double_t road;
784 if((t.GetSigmaY2() + sy2) > 0) road=10.*sqrt(t.GetSigmaY2() + sy2);
785 else return expectedNumberOfClusters;
786
787 wYrt = (Float_t) y;
788 wZrt = (Float_t) z;
789 wYwindow = (Float_t) road;
790 t.GetPxPyPz(px,py,pz);
791 wPx = (Float_t) px;
792 wPy = (Float_t) py;
793 wPz = (Float_t) pz;
794 wC = (Float_t) t.GetC();
795 wSigmaC2 = (Float_t) t.GetSigmaC2();
796 wSigmaTgl2 = (Float_t) t.GetSigmaTgl2();
797 wSigmaY2 = (Float_t) t.GetSigmaY2();
798 wSigmaZ2 = (Float_t) t.GetSigmaZ2();
799 wChi2 = -1;
800
801
802 AliTRDcluster *cl=0;
803 UInt_t index=0;
804
805 Double_t maxChi2=fgkMaxChi2;
806
807 wYclosest = 12345678;
808 wYcorrect = 12345678;
809 wZclosest = 12345678;
810 wZcorrect = 12345678;
811 wZwindow = TMath::Sqrt(2.25 * 12 * sz2);
812
813 // Find the closest correct cluster for debugging purposes
814 if (timeBin) {
815 Float_t minDY = 1000000;
816 for (Int_t i=0; i<timeBin; i++) {
817 AliTRDcluster* c=(AliTRDcluster*)(timeBin[i]);
818 if((c->GetLabel(0) != trackIndex) &&
819 (c->GetLabel(1) != trackIndex) &&
820 (c->GetLabel(2) != trackIndex)) continue;
821 if(TMath::Abs(c->GetY() - y) > minDY) continue;
822 minDY = TMath::Abs(c->GetY() - y);
823 wYcorrect = c->GetY();
824 wZcorrect = c->GetZ();
825
826 Double_t h01 = GetTiltFactor(c);
827 wChi2 = t.GetPredictedChi2(c, h01);
828 }
829 }
830
831 // Now go for the real cluster search
832
833 if (timeBin) {
834 //
835 //find cluster in history
836 cl =0;
837
838 AliTRDcluster * cl0 = timeBin[0];
839 if (!cl0) {
840 continue;
841 }
842 Int_t plane = fGeom->GetPlane(cl0->GetDetector());
843 if (plane>lastplane) continue;
844 Int_t timebin = cl0->GetLocalTimeBin();
845 AliTRDcluster * cl2= GetCluster(&t,plane, timebin);
846 if (cl2) {
847 cl =cl2;
848 Double_t h01 = GetTiltFactor(cl);
849 maxChi2=t.GetPredictedChi2(cl,h01);
850 }
851 if ((!cl) && road>fgkWideRoad) {
852 //if (t.GetNumberOfClusters()>4)
853 // cerr<<t.GetNumberOfClusters()
854 // <<"FindProlongation warning: Too broad road !\n";
855 continue;
856 }
857
858
859 if(!cl){
860
861 for (Int_t i=timeBin.Find(y-road); i<timeBin; i++) {
862 AliTRDcluster* c=(AliTRDcluster*)(timeBin[i]);
863 if (c->GetY() > y+road) break;
864 if (c->IsUsed() > 0) continue;
865 if((c->GetZ()-z)*(c->GetZ()-z) > 3 * sz2) continue;
866
867 Double_t h01 = GetTiltFactor(c);
868 Double_t chi2=t.GetPredictedChi2(c,h01);
869
870 if (chi2 > maxChi2) continue;
871 maxChi2=chi2;
872 cl=c;
873 index=timeBin.GetIndex(i);
874 }
875 }
876
877 if(!cl) {
878
879 for (Int_t i=timeBin.Find(y-road); i<timeBin; i++) {
880 AliTRDcluster* c=(AliTRDcluster*)(timeBin[i]);
881
882 if (c->GetY() > y+road) break;
883 if (c->IsUsed() > 0) continue;
884 if((c->GetZ()-z)*(c->GetZ()-z) > 12 * sz2) continue;
885
886 Double_t h01 = GetTiltFactor(c);
887 Double_t chi2=t.GetPredictedChi2(c, h01);
888
889 if (chi2 > maxChi2) continue;
890 maxChi2=chi2;
891 cl=c;
892 index=timeBin.GetIndex(i);
893 }
894 }
895 if (cl) {
896 wYclosest = cl->GetY();
897 wZclosest = cl->GetZ();
898 Double_t h01 = GetTiltFactor(cl);
899
900 t.SetSampledEdx(cl->GetQ()/dx,t.GetNumberOfClusters());
901 //printf("Track position\t%f\t%f\t%f\n",t.GetX(),t.GetY(),t.GetZ());
902 //printf("Cluster position\t%d\t%f\t%f\n",cl->GetLocalTimeBin(),cl->GetY(),cl->GetZ());
903 Int_t det = cl->GetDetector();
904 Int_t plane = fGeom->GetPlane(det);
905
906 if(!t.UpdateMI(cl,maxChi2,index,h01,plane)) {
907 //if(!t.Update(cl,maxChi2,index,h01)) {
908 //if(!tryAgain--) return 0;
909 }
910 else tryAgain=fMaxGap;
911 }
912 else {
913 //if (tryAgain==0) break;
914 tryAgain--;
915 }
916
917 /*
918 if((((Int_t) wTB)%15 == 0) || (((Int_t) wTB)%15 == 14)) {
919
920 printf(" %f", wIndex); //1
921 printf(" %f", wTB); //2
922 printf(" %f", wYrt); //3
923 printf(" %f", wYclosest); //4
924 printf(" %f", wYcorrect); //5
925 printf(" %f", wYwindow); //6
926 printf(" %f", wZrt); //7
927 printf(" %f", wZclosest); //8
928 printf(" %f", wZcorrect); //9
929 printf(" %f", wZwindow); //10
930 printf(" %f", wPx); //11
931 printf(" %f", wPy); //12
932 printf(" %f", wPz); //13
933 printf(" %f", wSigmaC2*1000000); //14
934 printf(" %f", wSigmaTgl2*1000); //15
935 printf(" %f", wSigmaY2); //16
936 // printf(" %f", wSigmaZ2); //17
937 printf(" %f", wChi2); //17
938 printf(" %f", wC); //18
939 printf("\n");
940 }
941 */
942 }
943 }
944 }
945 return expectedNumberOfClusters;
946
947
948}
949
950//___________________________________________________________________
951
952Int_t AliTRDtracker::FollowBackProlongation(AliTRDtrack& t)
953{
954 // Starting from current radial position of track <t> this function
955 // extrapolates the track up to outer timebin and in the sensitive
956 // layers confirms prolongation if a close cluster is found.
957 // Returns the number of clusters expected to be found in sensitive layers
958
959
960 Float_t wIndex, wTB, wChi2;
961 Float_t wYrt, wYclosest, wYcorrect, wYwindow;
962 Float_t wZrt, wZclosest, wZcorrect, wZwindow;
963 Float_t wPx, wPy, wPz, wC;
964 Double_t px, py, pz;
965 Float_t wSigmaC2, wSigmaTgl2, wSigmaY2, wSigmaZ2;
966
967 Int_t trackIndex = t.GetLabel();
968 Int_t tryAgain=fMaxGap;
969
970 Double_t alpha=t.GetAlpha();
971 TVector2::Phi_0_2pi(alpha);
972
973 Int_t s;
974
975 Int_t outerTB = fTrSec[0]->GetOuterTimeBin();
976 Double_t radLength, rho, x, dx, y, ymax = 0, z;
977 Bool_t lookForCluster;
978
979 Int_t expectedNumberOfClusters = 0;
980 x = t.GetX();
981
982 alpha=AliTRDgeometry::GetAlpha(); // note: change in meaning
983
984 Int_t nRefPlane = fgkFirstPlane;
985 Bool_t isNewLayer = kFALSE;
986
987 Double_t chi2;
988 Double_t minDY;
989 Int_t zone =-10;
990 Int_t nr;
991 for (nr=fTrSec[0]->GetLayerNumber(t.GetX()); nr<outerTB+1; nr++) {
992
993 y = t.GetY();
994 z = t.GetZ();
995
996 // first propagate to the outer surface of the current time bin
997
998 s = t.GetSector();
999 fTrSec[s]->GetLayer(nr)->GetPropagationParameters(y,z,dx,rho,radLength,lookForCluster);
1000 x = fTrSec[s]->GetLayer(nr)->GetX()+dx/2;
1001 y = t.GetY();
1002 z = t.GetZ();
1003
1004 if(!t.PropagateTo(x,radLength,rho)) break;
1005 // if (!AdjustSector(&t)) break;
1006 //
1007 // MI -fix untill correct material desription will be implemented
1008 //
1009 Float_t angle = t.GetAlpha(); // MI - if rotation - we go through the material
1010 if (!AdjustSector(&t)) break;
1011 Int_t cross = kFALSE;
1012
1013 if (TMath::Abs(angle - t.GetAlpha())>0.000001) cross = kTRUE; //better to stop track
1014 Int_t currentzone = fTrSec[s]->GetLayer(nr)->GetZone(z);
1015 if (currentzone==-10) cross = kTRUE; // we are in the frame
1016 if (currentzone>-10){ // layer knows where we are
1017 if (zone==-10) zone = currentzone;
1018 if (zone!=currentzone) cross=kTRUE;
1019 }
1020 if (cross) {
1021 t.IncCross();
1022 if (t.GetNCross()==1) t.MakeBackupTrack();
1023 if (t.GetNCross()>2) break;
1024 }
1025
1026 //
1027 //
1028 s = t.GetSector();
1029 if (!t.PropagateTo(x,radLength,rho)) break;
1030
1031 y = t.GetY();
1032 z = t.GetZ();
1033
1034 // Barrel Tracks [SR, 04.04.2003]
1035
1036 s = t.GetSector();
1037 if (fTrSec[s]->GetLayer(nr)->IsSensitive() !=
1038 fTrSec[s]->GetLayer(nr+1)->IsSensitive() ) {
1039
1040// if (IsStoringBarrel()) StoreBarrelTrack(&t, nRefPlane++, kTrackBack);
1041 }
1042
1043 if (fTrSec[s]->GetLayer(nr-1)->IsSensitive() &&
1044 ! fTrSec[s]->GetLayer(nr)->IsSensitive()) {
1045 isNewLayer = kTRUE;
1046 } else {isNewLayer = kFALSE;}
1047
1048 y = t.GetY();
1049 z = t.GetZ();
1050
1051 // now propagate to the middle plane of the next time bin
1052 fTrSec[s]->GetLayer(nr+1)->GetPropagationParameters(y,z,dx,rho,radLength,lookForCluster);
1053
1054 x = fTrSec[s]->GetLayer(nr+1)->GetX();
1055 if(!t.PropagateTo(x,radLength,rho)) break;
1056 if (!AdjustSector(&t)) break;
1057 s = t.GetSector();
1058 if(!t.PropagateTo(x,radLength,rho)) break;
1059
1060 y = t.GetY();
1061 z = t.GetZ();
1062
1063 if(fVocal) printf("nr+1=%d, x %f, z %f, y %f, ymax %f\n",nr+1,x,z,y,ymax);
1064 // printf("label %d, pl %d, lookForCluster %d \n",
1065 // trackIndex, nr+1, lookForCluster);
1066
1067 if(lookForCluster) {
1068 expectedNumberOfClusters++;
1069
1070 wIndex = (Float_t) t.GetLabel();
1071 wTB = fTrSec[s]->GetLayer(nr+1)->GetTimeBinIndex();
1072
1073 AliTRDpropagationLayer& timeBin=*(fTrSec[s]->GetLayer(nr+1));
1074 Double_t sy2=ExpectedSigmaY2(t.GetX(),t.GetTgl(),t.GetPt());
1075 Double_t sz2=ExpectedSigmaZ2(t.GetX(),t.GetTgl());
1076 if((t.GetSigmaY2() + sy2) < 0) break;
1077 Double_t road = 10.*sqrt(t.GetSigmaY2() + sy2);
1078 Double_t y=t.GetY(), z=t.GetZ();
1079
1080 wYrt = (Float_t) y;
1081 wZrt = (Float_t) z;
1082 wYwindow = (Float_t) road;
1083 t.GetPxPyPz(px,py,pz);
1084 wPx = (Float_t) px;
1085 wPy = (Float_t) py;
1086 wPz = (Float_t) pz;
1087 wC = (Float_t) t.GetC();
1088 wSigmaC2 = (Float_t) t.GetSigmaC2();
1089 wSigmaTgl2 = (Float_t) t.GetSigmaTgl2();
1090 wSigmaY2 = (Float_t) t.GetSigmaY2();
1091 wSigmaZ2 = (Float_t) t.GetSigmaZ2();
1092 wChi2 = -1;
1093
1094 if (road>fgkWideRoad) {
1095 if (t.GetNumberOfClusters()>4)
1096 cerr<<t.GetNumberOfClusters()
1097 <<"FindProlongation warning: Too broad road !\n";
1098 return 0;
1099 }
1100
1101 AliTRDcluster *cl=0;
1102 UInt_t index=0;
1103
1104 Double_t maxChi2=fgkMaxChi2;
1105
1106 if (isNewLayer) {
1107 road = 3 * road;
1108 //sz2 = 3 * sz2;
1109 maxChi2 = 10 * fgkMaxChi2;
1110 }
1111
1112 if (nRefPlane == fgkFirstPlane) maxChi2 = 20 * fgkMaxChi2;
1113 if (nRefPlane == fgkFirstPlane+2) maxChi2 = 15 * fgkMaxChi2;
1114 if (t.GetNRotate() > 0) maxChi2 = 3 * maxChi2;
1115
1116
1117 wYclosest = 12345678;
1118 wYcorrect = 12345678;
1119 wZclosest = 12345678;
1120 wZcorrect = 12345678;
1121 wZwindow = TMath::Sqrt(2.25 * 12 * sz2);
1122
1123 // Find the closest correct cluster for debugging purposes
1124 if (timeBin) {
1125 minDY = 1000000;
1126 for (Int_t i=0; i<timeBin; i++) {
1127 AliTRDcluster* c=(AliTRDcluster*)(timeBin[i]);
1128 if((c->GetLabel(0) != trackIndex) &&
1129 (c->GetLabel(1) != trackIndex) &&
1130 (c->GetLabel(2) != trackIndex)) continue;
1131 if(TMath::Abs(c->GetY() - y) > minDY) continue;
1132 //minDY = TMath::Abs(c->GetY() - y);
1133 minDY = c->GetY() - y;
1134 wYcorrect = c->GetY();
1135 wZcorrect = c->GetZ();
1136
1137 Double_t h01 = GetTiltFactor(c);
1138 wChi2 = t.GetPredictedChi2(c, h01);
1139 }
1140 }
1141
1142 // Now go for the real cluster search
1143
1144 if (timeBin) {
1145
1146 for (Int_t i=timeBin.Find(y-road); i<timeBin; i++) {
1147 AliTRDcluster* c=(AliTRDcluster*)(timeBin[i]);
1148 if (c->GetY() > y+road) break;
1149 if (c->IsUsed() > 0) continue;
1150 if((c->GetZ()-z)*(c->GetZ()-z) > 3 * sz2) continue;
1151
1152 Double_t h01 = GetTiltFactor(c);
1153 chi2=t.GetPredictedChi2(c,h01);
1154
1155 if (chi2 > maxChi2) continue;
1156 maxChi2=chi2;
1157 cl=c;
1158 index=timeBin.GetIndex(i);
1159
1160 //check is correct
1161 if((c->GetLabel(0) != trackIndex) &&
1162 (c->GetLabel(1) != trackIndex) &&
1163 (c->GetLabel(2) != trackIndex)) t.AddNWrong();
1164 }
1165
1166 if(!cl) {
1167
1168 for (Int_t i=timeBin.Find(y-road); i<timeBin; i++) {
1169 AliTRDcluster* c=(AliTRDcluster*)(timeBin[i]);
1170
1171 if (c->GetY() > y+road) break;
1172 if (c->IsUsed() > 0) continue;
1173 if((c->GetZ()-z)*(c->GetZ()-z) > 2.25 * 12 * sz2) continue;
1174
1175 Double_t h01 = GetTiltFactor(c);
1176 chi2=t.GetPredictedChi2(c,h01);
1177
1178 if (chi2 > maxChi2) continue;
1179 maxChi2=chi2;
1180 cl=c;
1181 index=timeBin.GetIndex(i);
1182 }
1183 }
1184
1185 if (cl) {
1186 wYclosest = cl->GetY();
1187 wZclosest = cl->GetZ();
1188
1189 t.SetSampledEdx(cl->GetQ()/dx,t.GetNumberOfClusters());
1190 Double_t h01 = GetTiltFactor(cl);
1191 Int_t det = cl->GetDetector();
1192 Int_t plane = fGeom->GetPlane(det);
1193
1194 if(!t.UpdateMI(cl,maxChi2,index,h01,plane)) {
1195 //if(!t.Update(cl,maxChi2,index,h01)) {
1196 if(!tryAgain--) return 0;
1197 }
1198 else tryAgain=fMaxGap;
1199 }
1200 else {
1201 if (tryAgain==0) break;
1202 tryAgain--;
1203
1204 //if (minDY < 1000000 && isNewLayer)
1205 //cout << "\t" << nRefPlane << "\t" << "\t" << t.GetNRotate() << "\t" <<
1206 // road << "\t" << minDY << "\t" << chi2 << "\t" << wChi2 << "\t" << maxChi2 << endl;
1207
1208 }
1209
1210 isNewLayer = kFALSE;
1211
1212 /*
1213 if((((Int_t) wTB)%15 == 0) || (((Int_t) wTB)%15 == 14)) {
1214
1215 printf(" %f", wIndex); //1
1216 printf(" %f", wTB); //2
1217 printf(" %f", wYrt); //3
1218 printf(" %f", wYclosest); //4
1219 printf(" %f", wYcorrect); //5
1220 printf(" %f", wYwindow); //6
1221 printf(" %f", wZrt); //7
1222 printf(" %f", wZclosest); //8
1223 printf(" %f", wZcorrect); //9
1224 printf(" %f", wZwindow); //10
1225 printf(" %f", wPx); //11
1226 printf(" %f", wPy); //12
1227 printf(" %f", wPz); //13
1228 printf(" %f", wSigmaC2*1000000); //14
1229 printf(" %f", wSigmaTgl2*1000); //15
1230 printf(" %f", wSigmaY2); //16
1231 // printf(" %f", wSigmaZ2); //17
1232 printf(" %f", wChi2); //17
1233 printf(" %f", wC); //18
1234 printf("\n");
1235 }
1236 */
1237 }
1238 }
1239 }
1240 if (nr<outerTB)
1241 t.SetStop(kTRUE);
1242 else
1243 t.SetStop(kFALSE);
1244 return expectedNumberOfClusters;
1245
1246
1247}
1248
1249//---------------------------------------------------------------------------
1250Int_t AliTRDtracker::Refit(AliTRDtrack& t, Int_t rf)
1251{
1252 // Starting from current position on track=t this function tries
1253 // to extrapolate the track up to timeBin=0 and to reuse already
1254 // assigned clusters. Returns the number of clusters
1255 // expected to be found in sensitive layers
1256 // get indices of assigned clusters for each layer
1257 // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch)
1258
1259 Int_t iCluster[90];
1260 for (Int_t i = 0; i < 90; i++) iCluster[i] = 0;
1261 for (Int_t i = 0; i < t.GetNumberOfClusters(); i++) {
1262 Int_t index = t.GetClusterIndex(i);
1263 AliTRDcluster *cl=(AliTRDcluster*) GetCluster(index);
1264 if (!cl) continue;
1265 Int_t detector=cl->GetDetector();
1266 Int_t localTimeBin=cl->GetLocalTimeBin();
1267 Int_t sector=fGeom->GetSector(detector);
1268 Int_t plane=fGeom->GetPlane(detector);
1269
1270 Int_t trackingSector = CookSectorIndex(sector);
1271
1272 Int_t gtb = fTrSec[trackingSector]->CookTimeBinIndex(plane,localTimeBin);
1273 if(gtb < 0) continue;
1274 Int_t layer = fTrSec[trackingSector]->GetLayerNumber(gtb);
1275 iCluster[layer] = index;
1276 }
1277 t.ResetClusters();
1278
1279 Int_t ns=Int_t(2*TMath::Pi()/AliTRDgeometry::GetAlpha()+0.5);
1280
1281 Double_t alpha=t.GetAlpha();
1282 alpha = TVector2::Phi_0_2pi(alpha);
1283
1284 Int_t s=Int_t(alpha/AliTRDgeometry::GetAlpha())%AliTRDgeometry::kNsect;
1285 Double_t radLength, rho, x, dx, y, ymax, z;
1286
1287 Int_t expectedNumberOfClusters = 0;
1288 Bool_t lookForCluster;
1289
1290 alpha=AliTRDgeometry::GetAlpha(); // note: change in meaning
1291
1292
1293 for (Int_t nr=fTrSec[0]->GetLayerNumber(t.GetX()); nr>rf; nr--) {
1294
1295 y = t.GetY(); z = t.GetZ();
1296
1297 // first propagate to the inner surface of the current time bin
1298 fTrSec[s]->GetLayer(nr)->GetPropagationParameters(y,z,dx,rho,radLength,lookForCluster);
1299 x = fTrSec[s]->GetLayer(nr)->GetX()-dx/2; y = t.GetY(); z = t.GetZ();
1300 if(!t.PropagateTo(x,radLength,rho)) break;
1301 y = t.GetY();
1302 ymax = x*TMath::Tan(0.5*alpha);
1303 if (y > ymax) {
1304 s = (s+1) % ns;
1305 if (!t.Rotate(alpha)) break;
1306 if(!t.PropagateTo(x,radLength,rho)) break;
1307 } else if (y <-ymax) {
1308 s = (s-1+ns) % ns;
1309 if (!t.Rotate(-alpha)) break;
1310 if(!t.PropagateTo(x,radLength,rho)) break;
1311 }
1312
1313 y = t.GetY(); z = t.GetZ();
1314
1315 // now propagate to the middle plane of the next time bin
1316 fTrSec[s]->GetLayer(nr-1)->GetPropagationParameters(y,z,dx,rho,radLength,lookForCluster);
1317 x = fTrSec[s]->GetLayer(nr-1)->GetX(); y = t.GetY(); z = t.GetZ();
1318 if(!t.PropagateTo(x,radLength,rho)) break;
1319 y = t.GetY();
1320 ymax = x*TMath::Tan(0.5*alpha);
1321 if (y > ymax) {
1322 s = (s+1) % ns;
1323 if (!t.Rotate(alpha)) break;
1324 if(!t.PropagateTo(x,radLength,rho)) break;
1325 } else if (y <-ymax) {
1326 s = (s-1+ns) % ns;
1327 if (!t.Rotate(-alpha)) break;
1328 if(!t.PropagateTo(x,radLength,rho)) break;
1329 }
1330
1331 if(lookForCluster) expectedNumberOfClusters++;
1332
1333 // use assigned cluster
1334 if (!iCluster[nr-1]) continue;
1335 AliTRDcluster *cl=(AliTRDcluster*)GetCluster(iCluster[nr-1]);
1336 Double_t h01 = GetTiltFactor(cl);
1337 Double_t chi2=t.GetPredictedChi2(cl, h01);
1338 t.SetSampledEdx(cl->GetQ()/dx,t.GetNumberOfClusters());
1339 t.Update(cl,chi2,iCluster[nr-1],h01);
1340 }
1341
1342 return expectedNumberOfClusters;
1343}
1344
1345//___________________________________________________________________
1346
1347Int_t AliTRDtracker::PropagateToOuterPlane(AliTRDtrack& t, Double_t xToGo)
1348{
1349 // Starting from current radial position of track <t> this function
1350 // extrapolates the track up to radial position <xToGo>.
1351 // Returns 1 if track reaches the plane, and 0 otherwise
1352
1353 Int_t ns=Int_t(2*TMath::Pi()/AliTRDgeometry::GetAlpha()+0.5);
1354
1355 Double_t alpha=t.GetAlpha();
1356
1357 if (alpha > 2.*TMath::Pi()) alpha -= 2.*TMath::Pi();
1358 if (alpha < 0. ) alpha += 2.*TMath::Pi();
1359
1360 Int_t s=Int_t(alpha/AliTRDgeometry::GetAlpha())%AliTRDgeometry::kNsect;
1361
1362 Bool_t lookForCluster;
1363 Double_t radLength, rho, x, dx, y, ymax, z;
1364
1365 x = t.GetX();
1366
1367 alpha=AliTRDgeometry::GetAlpha(); // note: change in meaning
1368
1369 Int_t plToGo = fTrSec[0]->GetLayerNumber(xToGo);
1370
1371 for (Int_t nr=fTrSec[0]->GetLayerNumber(x); nr<plToGo; nr++) {
1372
1373 y = t.GetY(); z = t.GetZ();
1374
1375 // first propagate to the outer surface of the current time bin
1376 fTrSec[s]->GetLayer(nr)->GetPropagationParameters(y,z,dx,rho,radLength,lookForCluster);
1377 x = fTrSec[s]->GetLayer(nr)->GetX()+dx/2; y = t.GetY(); z = t.GetZ();
1378 if(!t.PropagateTo(x,radLength,rho)) return 0;
1379 y = t.GetY();
1380 ymax = x*TMath::Tan(0.5*alpha);
1381 if (y > ymax) {
1382 s = (s+1) % ns;
1383 if (!t.Rotate(alpha)) return 0;
1384 } else if (y <-ymax) {
1385 s = (s-1+ns) % ns;
1386 if (!t.Rotate(-alpha)) return 0;
1387 }
1388 if(!t.PropagateTo(x,radLength,rho)) return 0;
1389
1390 y = t.GetY(); z = t.GetZ();
1391
1392 // now propagate to the middle plane of the next time bin
1393 fTrSec[s]->GetLayer(nr+1)->GetPropagationParameters(y,z,dx,rho,radLength,lookForCluster);
1394 x = fTrSec[s]->GetLayer(nr+1)->GetX(); y = t.GetY(); z = t.GetZ();
1395 if(!t.PropagateTo(x,radLength,rho)) return 0;
1396 y = t.GetY();
1397 ymax = x*TMath::Tan(0.5*alpha);
1398 if (y > ymax) {
1399 s = (s+1) % ns;
1400 if (!t.Rotate(alpha)) return 0;
1401 } else if (y <-ymax) {
1402 s = (s-1+ns) % ns;
1403 if (!t.Rotate(-alpha)) return 0;
1404 }
1405 if(!t.PropagateTo(x,radLength,rho)) return 0;
1406 }
1407 return 1;
1408}
1409
1410//___________________________________________________________________
1411
1412Int_t AliTRDtracker::PropagateToTPC(AliTRDtrack& t)
1413{
1414 // Starting from current radial position of track <t> this function
1415 // extrapolates the track up to radial position of the outermost
1416 // padrow of the TPC.
1417 // Returns 1 if track reaches the TPC, and 0 otherwise
1418
1419 //Int_t ns=Int_t(2*TMath::Pi()/AliTRDgeometry::GetAlpha()+0.5);
1420
1421 Double_t alpha=t.GetAlpha();
1422 alpha = TVector2::Phi_0_2pi(alpha);
1423
1424 Int_t s=Int_t(alpha/AliTRDgeometry::GetAlpha())%AliTRDgeometry::kNsect;
1425
1426 Bool_t lookForCluster;
1427 Double_t radLength, rho, x, dx, y, /*ymax,*/ z;
1428
1429 x = t.GetX();
1430
1431 alpha=AliTRDgeometry::GetAlpha(); // note: change in meaning
1432 Int_t plTPC = fTrSec[0]->GetLayerNumber(246.055);
1433
1434 for (Int_t nr=fTrSec[0]->GetLayerNumber(x); nr>plTPC; nr--) {
1435
1436 y = t.GetY();
1437 z = t.GetZ();
1438
1439 // first propagate to the outer surface of the current time bin
1440 fTrSec[s]->GetLayer(nr)->GetPropagationParameters(y,z,dx,rho,radLength,lookForCluster);
1441 x = fTrSec[s]->GetLayer(nr)->GetX()-dx/2;
1442
1443 if(!t.PropagateTo(x,radLength,rho)) return 0;
1444 AdjustSector(&t);
1445 if(!t.PropagateTo(x,radLength,rho)) return 0;
1446
1447 y = t.GetY();
1448 z = t.GetZ();
1449
1450 // now propagate to the middle plane of the next time bin
1451 fTrSec[s]->GetLayer(nr-1)->GetPropagationParameters(y,z,dx,rho,radLength,lookForCluster);
1452 x = fTrSec[s]->GetLayer(nr-1)->GetX();
1453
1454 if(!t.PropagateTo(x,radLength,rho)) return 0;
1455 AdjustSector(&t);
1456 if(!t.PropagateTo(x,radLength,rho)) return 0;
1457 }
1458 return 1;
1459}
1460
1461//_____________________________________________________________________________
1462Int_t AliTRDtracker::LoadClusters(TTree *cTree)
1463{
1464 // Fills clusters into TRD tracking_sectors
1465 // Note that the numbering scheme for the TRD tracking_sectors
1466 // differs from that of TRD sectors
1467
1468 if (ReadClusters(fClusters,cTree)) {
1469 Error("LoadClusters","Problem with reading the clusters !");
1470 return 1;
1471 }
1472 Int_t ncl=fClusters->GetEntriesFast();
1473 fNclusters=ncl;
1474 cout<<"\n LoadSectors: sorting "<<ncl<<" clusters"<<endl;
1475
1476 UInt_t index;
1477 for (Int_t ichamber=0;ichamber<5;ichamber++)
1478 for (Int_t isector=0;isector<18;isector++){
1479 fHoles[ichamber][isector]=kTRUE;
1480 }
1481
1482
1483 while (ncl--) {
1484// printf("\r %d left ",ncl);
1485 AliTRDcluster *c=(AliTRDcluster*)fClusters->UncheckedAt(ncl);
1486 Int_t detector=c->GetDetector();
1487 Int_t localTimeBin=c->GetLocalTimeBin();
1488 Int_t sector=fGeom->GetSector(detector);
1489 Int_t plane=fGeom->GetPlane(detector);
1490
1491 Int_t trackingSector = CookSectorIndex(sector);
1492 if (c->GetLabel(0)>0){
1493 Int_t chamber = fGeom->GetChamber(detector);
1494 fHoles[chamber][trackingSector]=kFALSE;
1495 }
1496
1497 Int_t gtb = fTrSec[trackingSector]->CookTimeBinIndex(plane,localTimeBin);
1498 if(gtb < 0) continue;
1499 Int_t layer = fTrSec[trackingSector]->GetLayerNumber(gtb);
1500
1501 index=ncl;
1502 fTrSec[trackingSector]->GetLayer(layer)->InsertCluster(c,index);
1503 }
1504 // printf("\r\n");
1505 //
1506 //
1507 /*
1508 for (Int_t isector=0;isector<18;isector++){
1509 for (Int_t ichamber=0;ichamber<5;ichamber++)
1510 if (fHoles[ichamber][isector]!=fGeom->IsHole(0,ichamber,17-isector))
1511 printf("Problem \t%d\t%d\t%d\t%d\n",isector,ichamber,fHoles[ichamber][isector],
1512 fGeom->IsHole(0,ichamber,17-isector));
1513 }
1514 */
1515 return 0;
1516}
1517
1518//_____________________________________________________________________________
1519void AliTRDtracker::UnloadClusters()
1520{
1521 //
1522 // Clears the arrays of clusters and tracks. Resets sectors and timebins
1523 //
1524
1525 Int_t i, nentr;
1526
1527 nentr = fClusters->GetEntriesFast();
1528 for (i = 0; i < nentr; i++) delete fClusters->RemoveAt(i);
1529 fNclusters = 0;
1530
1531 nentr = fSeeds->GetEntriesFast();
1532 for (i = 0; i < nentr; i++) delete fSeeds->RemoveAt(i);
1533
1534 nentr = fTracks->GetEntriesFast();
1535 for (i = 0; i < nentr; i++) delete fTracks->RemoveAt(i);
1536
1537 Int_t nsec = AliTRDgeometry::kNsect;
1538
1539 for (i = 0; i < nsec; i++) {
1540 for(Int_t pl = 0; pl < fTrSec[i]->GetNumberOfLayers(); pl++) {
1541 fTrSec[i]->GetLayer(pl)->Clear();
1542 }
1543 }
1544
1545}
1546
1547//__________________________________________________________________________
1548void AliTRDtracker::MakeSeeds(Int_t inner, Int_t outer, Int_t turn)
1549{
1550 // Creates track seeds using clusters in timeBins=i1,i2
1551
1552 if(turn > 2) {
1553 cerr<<"MakeSeeds: turn "<<turn<<" exceeds the limit of 2"<<endl;
1554 return;
1555 }
1556
1557 Double_t x[5], c[15];
1558 Int_t maxSec=AliTRDgeometry::kNsect;
1559
1560 Double_t alpha=AliTRDgeometry::GetAlpha();
1561 Double_t shift=AliTRDgeometry::GetAlpha()/2.;
1562 Double_t cs=cos(alpha), sn=sin(alpha);
1563 Double_t cs2=cos(2.*alpha), sn2=sin(2.*alpha);
1564
1565
1566 Int_t i2 = fTrSec[0]->GetLayerNumber(inner);
1567 Int_t i1 = fTrSec[0]->GetLayerNumber(outer);
1568
1569 Double_t x1 =fTrSec[0]->GetX(i1);
1570 Double_t xx2=fTrSec[0]->GetX(i2);
1571
1572 for (Int_t ns=0; ns<maxSec; ns++) {
1573
1574 Int_t nl2 = *(fTrSec[(ns-2+maxSec)%maxSec]->GetLayer(i2));
1575 Int_t nl=(*fTrSec[(ns-1+maxSec)%maxSec]->GetLayer(i2));
1576 Int_t nm=(*fTrSec[ns]->GetLayer(i2));
1577 Int_t nu=(*fTrSec[(ns+1)%maxSec]->GetLayer(i2));
1578 Int_t nu2=(*fTrSec[(ns+2)%maxSec]->GetLayer(i2));
1579
1580 AliTRDpropagationLayer& r1=*(fTrSec[ns]->GetLayer(i1));
1581
1582 for (Int_t is=0; is < r1; is++) {
1583 Double_t y1=r1[is]->GetY(), z1=r1[is]->GetZ();
1584
1585 for (Int_t js=0; js < nl2+nl+nm+nu+nu2; js++) {
1586
1587 const AliTRDcluster *cl;
1588 Double_t x2, y2, z2;
1589 Double_t x3=0., y3=0.;
1590
1591 if (js<nl2) {
1592 if(turn != 2) continue;
1593 AliTRDpropagationLayer& r2=*(fTrSec[(ns-2+maxSec)%maxSec]->GetLayer(i2));
1594 cl=r2[js];
1595 y2=cl->GetY(); z2=cl->GetZ();
1596
1597 x2= xx2*cs2+y2*sn2;
1598 y2=-xx2*sn2+y2*cs2;
1599 }
1600 else if (js<nl2+nl) {
1601 if(turn != 1) continue;
1602 AliTRDpropagationLayer& r2=*(fTrSec[(ns-1+maxSec)%maxSec]->GetLayer(i2));
1603 cl=r2[js-nl2];
1604 y2=cl->GetY(); z2=cl->GetZ();
1605
1606 x2= xx2*cs+y2*sn;
1607 y2=-xx2*sn+y2*cs;
1608 }
1609 else if (js<nl2+nl+nm) {
1610 if(turn != 1) continue;
1611 AliTRDpropagationLayer& r2=*(fTrSec[ns]->GetLayer(i2));
1612 cl=r2[js-nl2-nl];
1613 x2=xx2; y2=cl->GetY(); z2=cl->GetZ();
1614 }
1615 else if (js<nl2+nl+nm+nu) {
1616 if(turn != 1) continue;
1617 AliTRDpropagationLayer& r2=*(fTrSec[(ns+1)%maxSec]->GetLayer(i2));
1618 cl=r2[js-nl2-nl-nm];
1619 y2=cl->GetY(); z2=cl->GetZ();
1620
1621 x2=xx2*cs-y2*sn;
1622 y2=xx2*sn+y2*cs;
1623 }
1624 else {
1625 if(turn != 2) continue;
1626 AliTRDpropagationLayer& r2=*(fTrSec[(ns+2)%maxSec]->GetLayer(i2));
1627 cl=r2[js-nl2-nl-nm-nu];
1628 y2=cl->GetY(); z2=cl->GetZ();
1629
1630 x2=xx2*cs2-y2*sn2;
1631 y2=xx2*sn2+y2*cs2;
1632 }
1633
1634 if(TMath::Abs(z1-z2) > fgkMaxSeedDeltaZ12) continue;
1635
1636 Double_t zz=z1 - z1/x1*(x1-x2);
1637
1638 if (TMath::Abs(zz-z2)>fgkMaxSeedDeltaZ) continue;
1639
1640 Double_t d=(x2-x1)*(0.-y2)-(0.-x2)*(y2-y1);
1641 if (d==0.) {cerr<<"TRD MakeSeeds: Straight seed !\n"; continue;}
1642
1643 x[0]=y1;
1644 x[1]=z1;
1645 x[4]=f1trd(x1,y1,x2,y2,x3,y3);
1646
1647 if (TMath::Abs(x[4]) > fgkMaxSeedC) continue;
1648
1649 x[2]=f2trd(x1,y1,x2,y2,x3,y3);
1650
1651 if (TMath::Abs(x[4]*x1-x[2]) >= 0.99999) continue;
1652
1653 x[3]=f3trd(x1,y1,x2,y2,z1,z2);
1654
1655 if (TMath::Abs(x[3]) > fgkMaxSeedTan) continue;
1656
1657 Double_t a=asin(x[2]);
1658 Double_t zv=z1 - x[3]/x[4]*(a+asin(x[4]*x1-x[2]));
1659
1660 if (TMath::Abs(zv)>fgkMaxSeedVertexZ) continue;
1661
1662 Double_t sy1=r1[is]->GetSigmaY2(), sz1=r1[is]->GetSigmaZ2();
1663 Double_t sy2=cl->GetSigmaY2(), sz2=cl->GetSigmaZ2();
1664 Double_t sy3=fgkSeedErrorSY3, sy=fgkSeedErrorSY, sz=fgkSeedErrorSZ;
1665
1666 // Tilt changes
1667 Double_t h01 = GetTiltFactor(r1[is]);
1668 Double_t xuFactor = 100.;
1669 if(fNoTilt) {
1670 h01 = 0;
1671 xuFactor = 1;
1672 }
1673
1674 sy1=sy1+sz1*h01*h01;
1675 Double_t syz=sz1*(-h01);
1676 // end of tilt changes
1677
1678 Double_t f40=(f1trd(x1,y1+sy,x2,y2,x3,y3)-x[4])/sy;
1679 Double_t f42=(f1trd(x1,y1,x2,y2+sy,x3,y3)-x[4])/sy;
1680 Double_t f43=(f1trd(x1,y1,x2,y2,x3,y3+sy)-x[4])/sy;
1681 Double_t f20=(f2trd(x1,y1+sy,x2,y2,x3,y3)-x[2])/sy;
1682 Double_t f22=(f2trd(x1,y1,x2,y2+sy,x3,y3)-x[2])/sy;
1683 Double_t f23=(f2trd(x1,y1,x2,y2,x3,y3+sy)-x[2])/sy;
1684 Double_t f30=(f3trd(x1,y1+sy,x2,y2,z1,z2)-x[3])/sy;
1685 Double_t f31=(f3trd(x1,y1,x2,y2,z1+sz,z2)-x[3])/sz;
1686 Double_t f32=(f3trd(x1,y1,x2,y2+sy,z1,z2)-x[3])/sy;
1687 Double_t f34=(f3trd(x1,y1,x2,y2,z1,z2+sz)-x[3])/sz;
1688
1689
1690 c[0]=sy1;
1691 // c[1]=0.; c[2]=sz1;
1692 c[1]=syz; c[2]=sz1*xuFactor;
1693 c[3]=f20*sy1; c[4]=0.; c[5]=f20*sy1*f20+f22*sy2*f22+f23*sy3*f23;
1694 c[6]=f30*sy1; c[7]=f31*sz1; c[8]=f30*sy1*f20+f32*sy2*f22;
1695 c[9]=f30*sy1*f30+f31*sz1*f31+f32*sy2*f32+f34*sz2*f34;
1696 c[10]=f40*sy1; c[11]=0.; c[12]=f40*sy1*f20+f42*sy2*f22+f43*sy3*f23;
1697 c[13]=f30*sy1*f40+f32*sy2*f42;
1698 c[14]=f40*sy1*f40+f42*sy2*f42+f43*sy3*f43;
1699
1700 UInt_t index=r1.GetIndex(is);
1701
1702 AliTRDtrack *track=new AliTRDtrack(r1[is],index,x,c,x1,ns*alpha+shift);
1703
1704 Int_t rc=FollowProlongation(*track, i2);
1705
1706 if ((rc < 1) ||
1707 (track->GetNumberOfClusters() <
1708 (outer-inner)*fgkMinClustersInSeed)) delete track;
1709 else {
1710 fSeeds->AddLast(track); fNseeds++;
1711// cerr<<"\r found seed "<<fNseeds;
1712 }
1713 }
1714 }
1715 }
1716}
1717
1718//_____________________________________________________________________________
1719Int_t AliTRDtracker::ReadClusters(TObjArray *array, TTree *ClusterTree) const
1720{
1721 //
1722 // Reads AliTRDclusters (option >= 0) or AliTRDrecPoints (option < 0)
1723 // from the file. The names of the cluster tree and branches
1724 // should match the ones used in AliTRDclusterizer::WriteClusters()
1725 //
1726 TObjArray *clusterArray = new TObjArray(400);
1727
1728 TBranch *branch=ClusterTree->GetBranch("TRDcluster");
1729 if (!branch) {
1730 Error("ReadClusters","Can't get the branch !");
1731 return 1;
1732 }
1733 branch->SetAddress(&clusterArray);
1734
1735 Int_t nEntries = (Int_t) ClusterTree->GetEntries();
1736 // printf("found %d entries in %s.\n",nEntries,ClusterTree->GetName());
1737
1738 // Loop through all entries in the tree
1739 Int_t nbytes = 0;
1740 AliTRDcluster *c = 0;
1741 // printf("\n");
1742
1743 for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) {
1744
1745 // Import the tree
1746 nbytes += ClusterTree->GetEvent(iEntry);
1747
1748 // Get the number of points in the detector
1749 Int_t nCluster = clusterArray->GetEntriesFast();
1750// printf("\r Read %d clusters from entry %d", nCluster, iEntry);
1751
1752 // Loop through all TRD digits
1753 for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) {
1754 c = (AliTRDcluster*)clusterArray->UncheckedAt(iCluster);
1755 AliTRDcluster *co = new AliTRDcluster(*c);
1756 co->SetSigmaY2(c->GetSigmaY2() * fSY2corr);
1757 Int_t ltb = co->GetLocalTimeBin();
1758 if(ltb == 19) co->SetSigmaZ2(c->GetSigmaZ2());
1759 else if(fNoTilt) co->SetSigmaZ2(c->GetSigmaZ2() * fSZ2corr);
1760 array->AddLast(co);
1761 delete clusterArray->RemoveAt(iCluster);
1762 }
1763 }
1764
1765 delete clusterArray;
1766
1767 return 0;
1768}
1769
1770//__________________________________________________________________
1771void AliTRDtracker::CookLabel(AliKalmanTrack* pt, Float_t wrong) const
1772{
1773 //
1774 // This cooks a label. Mmmmh, smells good...
1775 //
1776
1777 Int_t label=123456789, index, i, j;
1778 Int_t ncl=pt->GetNumberOfClusters();
1779 const Int_t kRange = fTrSec[0]->GetOuterTimeBin()+1;
1780
1781 Bool_t labelAdded;
1782
1783 // Int_t s[kRange][2];
1784 Int_t **s = new Int_t* [kRange];
1785 for (i=0; i<kRange; i++) {
1786 s[i] = new Int_t[2];
1787 }
1788 for (i=0; i<kRange; i++) {
1789 s[i][0]=-1;
1790 s[i][1]=0;
1791 }
1792
1793 Int_t t0,t1,t2;
1794 for (i=0; i<ncl; i++) {
1795 index=pt->GetClusterIndex(i);
1796 AliTRDcluster *c=(AliTRDcluster*)fClusters->UncheckedAt(index);
1797 t0=c->GetLabel(0);
1798 t1=c->GetLabel(1);
1799 t2=c->GetLabel(2);
1800 }
1801
1802 for (i=0; i<ncl; i++) {
1803 index=pt->GetClusterIndex(i);
1804 AliTRDcluster *c=(AliTRDcluster*)fClusters->UncheckedAt(index);
1805 for (Int_t k=0; k<3; k++) {
1806 label=c->GetLabel(k);
1807 labelAdded=kFALSE; j=0;
1808 if (label >= 0) {
1809 while ( (!labelAdded) && ( j < kRange ) ) {
1810 if (s[j][0]==label || s[j][1]==0) {
1811 s[j][0]=label;
1812 s[j][1]=s[j][1]+1;
1813 labelAdded=kTRUE;
1814 }
1815 j++;
1816 }
1817 }
1818 }
1819 }
1820
1821 Int_t max=0;
1822 label = -123456789;
1823
1824 for (i=0; i<kRange; i++) {
1825 if (s[i][1]>max) {
1826 max=s[i][1]; label=s[i][0];
1827 }
1828 }
1829
1830 for (i=0; i<kRange; i++) {
1831 delete []s[i];
1832 }
1833
1834 delete []s;
1835
1836 if ((1.- Float_t(max)/ncl) > wrong) label=-label;
1837
1838 pt->SetLabel(label);
1839
1840}
1841
1842
1843//__________________________________________________________________
1844void AliTRDtracker::UseClusters(const AliKalmanTrack* t, Int_t from) const
1845{
1846 //
1847 // Use clusters, but don't abuse them!
1848 //
1849
1850 Int_t ncl=t->GetNumberOfClusters();
1851 for (Int_t i=from; i<ncl; i++) {
1852 Int_t index = t->GetClusterIndex(i);
1853 AliTRDcluster *c=(AliTRDcluster*)fClusters->UncheckedAt(index);
1854 c->Use();
1855 }
1856}
1857
1858
1859//_____________________________________________________________________
1860Double_t AliTRDtracker::ExpectedSigmaY2(Double_t , Double_t , Double_t ) const
1861{
1862 // Parametrised "expected" error of the cluster reconstruction in Y
1863
1864 Double_t s = 0.08 * 0.08;
1865 return s;
1866}
1867
1868//_____________________________________________________________________
1869Double_t AliTRDtracker::ExpectedSigmaZ2(Double_t , Double_t ) const
1870{
1871 // Parametrised "expected" error of the cluster reconstruction in Z
1872
1873 Double_t s = 9 * 9 /12.;
1874 return s;
1875}
1876
1877//_____________________________________________________________________
1878Double_t AliTRDtracker::GetX(Int_t sector, Int_t plane, Int_t localTB) const
1879{
1880 //
1881 // Returns radial position which corresponds to time bin <localTB>
1882 // in tracking sector <sector> and plane <plane>
1883 //
1884
1885 Int_t index = fTrSec[sector]->CookTimeBinIndex(plane, localTB);
1886 Int_t pl = fTrSec[sector]->GetLayerNumber(index);
1887 return fTrSec[sector]->GetLayer(pl)->GetX();
1888
1889}
1890
1891
1892//_______________________________________________________
1893AliTRDtracker::AliTRDpropagationLayer::AliTRDpropagationLayer(Double_t x,
1894 Double_t dx, Double_t rho, Double_t radLength, Int_t tbIndex)
1895{
1896 //
1897 // AliTRDpropagationLayer constructor
1898 //
1899
1900 fN = 0; fX = x; fdX = dx; fRho = rho; fX0 = radLength;
1901 fClusters = NULL; fIndex = NULL; fTimeBinIndex = tbIndex;
1902
1903
1904 for(Int_t i=0; i < (Int_t) kZones; i++) {
1905 fZc[i]=0; fZmax[i] = 0;
1906 }
1907
1908 fYmax = 0;
1909
1910 if(fTimeBinIndex >= 0) {
1911 fClusters = new AliTRDcluster*[kMaxClusterPerTimeBin];
1912 fIndex = new UInt_t[kMaxClusterPerTimeBin];
1913 }
1914
1915 for (Int_t i=0;i<5;i++) fIsHole[i] = kFALSE;
1916 fHole = kFALSE;
1917 fHoleZc = 0;
1918 fHoleZmax = 0;
1919 fHoleYc = 0;
1920 fHoleYmax = 0;
1921 fHoleRho = 0;
1922 fHoleX0 = 0;
1923
1924}
1925
1926//_______________________________________________________
1927void AliTRDtracker::AliTRDpropagationLayer::SetHole(
1928 Double_t Zmax, Double_t Ymax, Double_t rho,
1929 Double_t radLength, Double_t Yc, Double_t Zc)
1930{
1931 //
1932 // Sets hole in the layer
1933 //
1934 fHole = kTRUE;
1935 fHoleZc = Zc;
1936 fHoleZmax = Zmax;
1937 fHoleYc = Yc;
1938 fHoleYmax = Ymax;
1939 fHoleRho = rho;
1940 fHoleX0 = radLength;
1941}
1942
1943
1944//_______________________________________________________
1945AliTRDtracker::AliTRDtrackingSector::AliTRDtrackingSector(AliTRDgeometry* geo, Int_t gs, AliTRDparameter* par)
1946{
1947 //
1948 // AliTRDtrackingSector Constructor
1949 //
1950
1951 fGeom = geo;
1952 fPar = par;
1953 fGeomSector = gs;
1954 fTzeroShift = 0.13;
1955 fN = 0;
1956 //
1957 // get holes description from geometry
1958 Bool_t holes[AliTRDgeometry::kNcham];
1959 //printf("sector\t%d\t",gs);
1960 for (Int_t icham=0; icham<AliTRDgeometry::kNcham;icham++){
1961 holes[icham] = fGeom->IsHole(0,icham,gs);
1962 //printf("%d",holes[icham]);
1963 }
1964 //printf("\n");
1965
1966 for(UInt_t i=0; i < kMaxTimeBinIndex; i++) fTimeBinIndex[i] = -1;
1967
1968
1969 AliTRDpropagationLayer* ppl;
1970
1971 Double_t x, xin, xout, dx, rho, radLength;
1972 Int_t steps;
1973
1974 // set time bins in the gas of the TPC
1975
1976 xin = 246.055; xout = 254.055; steps = 20; dx = (xout-xin)/steps;
1977 rho = 0.9e-3; radLength = 28.94;
1978
1979 for(Int_t i=0; i<steps; i++) {
1980 x = xin + i*dx + dx/2;
1981 ppl = new AliTRDpropagationLayer(x,dx,rho,radLength,-1);
1982 InsertLayer(ppl);
1983 }
1984
1985 // set time bins in the outer field cage vessel
1986
1987 dx = 50e-4; xin = xout; xout = xin + dx; rho = 1.71; radLength = 44.77; // Tedlar
1988 ppl = new AliTRDpropagationLayer(xin+dx/2,dx,rho,radLength,-1);
1989 InsertLayer(ppl);
1990
1991 dx = 0.02; xin = xout; xout = xin + dx; rho = 1.45; radLength = 44.86; // prepreg
1992 ppl = new AliTRDpropagationLayer(xin+dx/2,dx,rho,radLength,-1);
1993 InsertLayer(ppl);
1994
1995 dx = 2.; xin = xout; xout = xin + dx; rho = 1.45*0.02; radLength = 41.28; // Nomex
1996 steps = 5; dx = (xout - xin)/steps;
1997 for(Int_t i=0; i<steps; i++) {
1998 x = xin + i*dx + dx/2;
1999 ppl = new AliTRDpropagationLayer(x,dx,rho,radLength,-1);
2000 InsertLayer(ppl);
2001 }
2002
2003 dx = 0.02; xin = xout; xout = xin + dx; rho = 1.45; radLength = 44.86; // prepreg
2004 ppl = new AliTRDpropagationLayer(xin+dx/2,dx,rho,radLength,-1);
2005 InsertLayer(ppl);
2006
2007 dx = 50e-4; xin = xout; xout = xin + dx; rho = 1.71; radLength = 44.77; // Tedlar
2008 ppl = new AliTRDpropagationLayer(xin+dx/2,dx,rho,radLength,-1);
2009 InsertLayer(ppl);
2010
2011
2012 // set time bins in CO2
2013
2014 xin = xout; xout = 275.0;
2015 steps = 50; dx = (xout - xin)/steps;
2016 rho = 1.977e-3; radLength = 36.2;
2017
2018 for(Int_t i=0; i<steps; i++) {
2019 x = xin + i*dx + dx/2;
2020 ppl = new AliTRDpropagationLayer(x,dx,rho,radLength,-1);
2021 InsertLayer(ppl);
2022 }
2023
2024 // set time bins in the outer containment vessel
2025
2026 dx = 50e-4; xin = xout; xout = xin + dx; rho = 2.7; radLength = 24.01; // Al
2027 ppl = new AliTRDpropagationLayer(xin+dx/2,dx,rho,radLength,-1);
2028 InsertLayer(ppl);
2029
2030 dx = 50e-4; xin = xout; xout = xin + dx; rho = 1.71; radLength = 44.77; // Tedlar
2031 ppl = new AliTRDpropagationLayer(xin+dx/2,dx,rho,radLength,-1);
2032 InsertLayer(ppl);
2033
2034 dx = 0.06; xin = xout; xout = xin + dx; rho = 1.45; radLength = 44.86; // prepreg
2035 ppl = new AliTRDpropagationLayer(xin+dx/2,dx,rho,radLength,-1);
2036 InsertLayer(ppl);
2037
2038 dx = 3.; xin = xout; xout = xin + dx; rho = 1.45*0.02; radLength = 41.28; // Nomex
2039 steps = 10; dx = (xout - xin)/steps;
2040 for(Int_t i=0; i<steps; i++) {
2041 x = xin + i*dx + dx/2;
2042 ppl = new AliTRDpropagationLayer(x,dx,rho,radLength,-1);
2043 InsertLayer(ppl);
2044 }
2045
2046 dx = 0.06; xin = xout; xout = xin + dx; rho = 1.45; radLength = 44.86; // prepreg
2047 ppl = new AliTRDpropagationLayer(xin+dx/2,dx,rho,radLength,-1);
2048 InsertLayer(ppl);
2049
2050 dx = 50e-4; xin = xout; xout = xin + dx; rho = 1.71; radLength = 44.77; // Tedlar
2051 ppl = new AliTRDpropagationLayer(xin+dx/2,dx,rho,radLength,-1);
2052 InsertLayer(ppl);
2053
2054 dx = 50e-4; xin = xout; xout = xin + dx; rho = 2.7; radLength = 24.01; // Al
2055 ppl = new AliTRDpropagationLayer(xin+dx/2,dx,rho,radLength,-1);
2056 InsertLayer(ppl);
2057
2058 Double_t xtrd = (Double_t) fGeom->Rmin();
2059
2060 // add layers between TPC and TRD (Air temporarily)
2061 xin = xout; xout = xtrd;
2062 steps = 50; dx = (xout - xin)/steps;
2063 rho = 1.2e-3; radLength = 36.66;
2064
2065 for(Int_t i=0; i<steps; i++) {
2066 x = xin + i*dx + dx/2;
2067 ppl = new AliTRDpropagationLayer(x,dx,rho,radLength,-1);
2068 InsertLayer(ppl);
2069 }
2070
2071
2072 // Double_t alpha=AliTRDgeometry::GetAlpha();
2073
2074 // add layers for each of the planes
2075
2076 Double_t dxRo = (Double_t) fGeom->CroHght(); // Rohacell
2077 Double_t dxSpace = (Double_t) fGeom->Cspace(); // Spacing between planes
2078 Double_t dxAmp = (Double_t) fGeom->CamHght(); // Amplification region
2079 Double_t dxDrift = (Double_t) fGeom->CdrHght(); // Drift region
2080 Double_t dxRad = (Double_t) fGeom->CraHght(); // Radiator
2081 Double_t dxTEC = dxRad + dxDrift + dxAmp + dxRo;
2082 Double_t dxPlane = dxTEC + dxSpace;
2083
2084 Int_t tb, tbIndex;
2085 const Int_t kNchambers = AliTRDgeometry::Ncham();
2086 Double_t ymax = 0;
2087 //, holeYmax = 0;
2088 Double_t ymaxsensitive=0;
2089 Double_t *zc = new Double_t[kNchambers];
2090 Double_t *zmax = new Double_t[kNchambers];
2091 Double_t *zmaxsensitive = new Double_t[kNchambers];
2092 // Double_t holeZmax = 1000.; // the whole sector is missing
2093
2094 for(Int_t plane = 0; plane < AliTRDgeometry::Nplan(); plane++) {
2095 //
2096 // Radiator
2097 xin = xtrd + plane * dxPlane; xout = xin + dxRad;
2098 steps = 12; dx = (xout - xin)/steps; rho = 0.074; radLength = 40.6;
2099 for(Int_t i=0; i<steps; i++) {
2100 x = xin + i*dx + dx/2;
2101 ppl = new AliTRDpropagationLayer(x,dx,rho,radLength,-1);
2102 InsertLayer(ppl);
2103 }
2104
2105 ymax = fGeom->GetChamberWidth(plane)/2.;
2106 ymaxsensitive = (fPar->GetColPadSize(plane)*fPar->GetColMax(plane)-4)/2.;
2107
2108 for(Int_t ch = 0; ch < kNchambers; ch++) {
2109 zmax[ch] = fGeom->GetChamberLength(plane,ch)/2;
2110 Float_t pad = fPar->GetRowPadSize(plane,ch,0);
2111 Float_t row0 = fPar->GetRow0(plane,ch,0);
2112 Int_t nPads = fPar->GetRowMax(plane,ch,0);
2113 zmaxsensitive[ch] = Float_t(nPads)*pad/2.;
2114 // zc[ch] = (pad * nPads)/2 + row0 - pad/2;
2115 zc[ch] = (pad * nPads)/2 + row0;
2116 //zc[ch] = row0+zmax[ch]-AliTRDgeometry::RpadW();
2117
2118 }
2119
2120 dx = fPar->GetTimeBinSize();
2121 rho = 0.00295 * 0.85; radLength = 11.0;
2122
2123 Double_t x0 = (Double_t) fPar->GetTime0(plane);
2124 Double_t xbottom = x0 - dxDrift;
2125 Double_t xtop = x0 + dxAmp;
2126 //
2127 // Amplification region
2128 steps = (Int_t) (dxAmp/dx);
2129
2130 for(tb = 0; tb < steps; tb++) {
2131 x = x0 + tb * dx + dx/2;
2132 tbIndex = CookTimeBinIndex(plane, -tb-1);
2133 ppl = new AliTRDpropagationLayer(x,dx,rho,radLength,tbIndex);
2134 ppl->SetYmax(ymax,ymaxsensitive);
2135 ppl->SetZ(zc, zmax, zmaxsensitive);
2136 ppl->SetHoles(holes);
2137 InsertLayer(ppl);
2138 }
2139 tbIndex = CookTimeBinIndex(plane, -steps);
2140 x = (x + dx/2 + xtop)/2;
2141 dx = 2*(xtop-x);
2142 ppl = new AliTRDpropagationLayer(x,dx,rho,radLength,tbIndex);
2143 ppl->SetYmax(ymax,ymaxsensitive);
2144 ppl->SetZ(zc, zmax,zmaxsensitive);
2145 ppl->SetHoles(holes);
2146 InsertLayer(ppl);
2147
2148 // Drift region
2149 dx = fPar->GetTimeBinSize();
2150 steps = (Int_t) (dxDrift/dx);
2151
2152 for(tb = 0; tb < steps; tb++) {
2153 x = x0 - tb * dx - dx/2;
2154 tbIndex = CookTimeBinIndex(plane, tb);
2155
2156 ppl = new AliTRDpropagationLayer(x,dx,rho,radLength,tbIndex);
2157 ppl->SetYmax(ymax,ymaxsensitive);
2158 ppl->SetZ(zc, zmax, zmaxsensitive);
2159 ppl->SetHoles(holes);
2160 InsertLayer(ppl);
2161 }
2162 tbIndex = CookTimeBinIndex(plane, steps);
2163 x = (x - dx/2 + xbottom)/2;
2164 dx = 2*(x-xbottom);
2165 ppl = new AliTRDpropagationLayer(x,dx,rho,radLength,tbIndex);
2166 ppl->SetYmax(ymax,ymaxsensitive);
2167 ppl->SetZ(zc, zmax, zmaxsensitive);
2168 ppl->SetHoles(holes);
2169 InsertLayer(ppl);
2170
2171 // Pad Plane
2172 xin = xtop; dx = 0.025; xout = xin + dx; rho = 1.7; radLength = 33.0;
2173 ppl = new AliTRDpropagationLayer(xin+dx/2,dx,rho,radLength,-1);
2174 ppl->SetYmax(ymax,ymaxsensitive);
2175 ppl->SetZ(zc, zmax,zmax);
2176 ppl->SetHoles(holes);
2177 InsertLayer(ppl);
2178
2179 // Rohacell
2180 xin = xout; xout = xtrd + (plane + 1) * dxPlane - dxSpace;
2181 steps = 5; dx = (xout - xin)/steps; rho = 0.074; radLength = 40.6;
2182 for(Int_t i=0; i<steps; i++) {
2183 x = xin + i*dx + dx/2;
2184 ppl = new AliTRDpropagationLayer(x,dx,rho,radLength,-1);
2185 ppl->SetYmax(ymax,ymaxsensitive);
2186 ppl->SetZ(zc, zmax,zmax);
2187 ppl->SetHoles(holes);
2188 InsertLayer(ppl);
2189 }
2190
2191 // Space between the chambers, air
2192 xin = xout; xout = xtrd + (plane + 1) * dxPlane;
2193 steps = 5; dx = (xout - xin)/steps; rho = 1.29e-3; radLength = 36.66;
2194 for(Int_t i=0; i<steps; i++) {
2195 x = xin + i*dx + dx/2;
2196 ppl = new AliTRDpropagationLayer(x,dx,rho,radLength,-1);
2197 InsertLayer(ppl);
2198 }
2199 }
2200
2201 // Space between the TRD and RICH
2202 Double_t xRICH = 500.;
2203 xin = xout; xout = xRICH;
2204 steps = 200; dx = (xout - xin)/steps; rho = 1.29e-3; radLength = 36.66;
2205 for(Int_t i=0; i<steps; i++) {
2206 x = xin + i*dx + dx/2;
2207 ppl = new AliTRDpropagationLayer(x,dx,rho,radLength,-1);
2208 InsertLayer(ppl);
2209 }
2210
2211 MapTimeBinLayers();
2212 delete [] zc;
2213 delete [] zmax;
2214
2215}
2216
2217//______________________________________________________
2218
2219Int_t AliTRDtracker::AliTRDtrackingSector::CookTimeBinIndex(Int_t plane, Int_t localTB) const
2220{
2221 //
2222 // depending on the digitization parameters calculates "global"
2223 // time bin index for timebin <localTB> in plane <plane>
2224 //
2225
2226 Double_t dxAmp = (Double_t) fGeom->CamHght(); // Amplification region
2227 Double_t dxDrift = (Double_t) fGeom->CdrHght(); // Drift region
2228 Double_t dx = (Double_t) fPar->GetTimeBinSize();
2229
2230 Int_t tbAmp = fPar->GetTimeBefore();
2231 Int_t maxAmp = (Int_t) ((dxAmp+0.000001)/dx);
2232 if(kTRUE) maxAmp = 0; // intentional until we change parameter class
2233 Int_t tbDrift = fPar->GetTimeMax();
2234 Int_t maxDrift = (Int_t) ((dxDrift+0.000001)/dx);
2235
2236 Int_t tbPerPlane = TMath::Min(tbAmp,maxAmp) + TMath::Min(tbDrift,maxDrift);
2237
2238 Int_t gtb = (plane+1) * tbPerPlane - localTB - 1 - TMath::Min(tbAmp,maxAmp);
2239
2240 if((localTB < 0) &&
2241 (TMath::Abs(localTB) > TMath::Min(tbAmp,maxAmp))) return -1;
2242 if(localTB >= TMath::Min(tbDrift,maxDrift)) return -1;
2243
2244 return gtb;
2245
2246
2247}
2248
2249//______________________________________________________
2250
2251void AliTRDtracker::AliTRDtrackingSector::MapTimeBinLayers()
2252{
2253 //
2254 // For all sensitive time bins sets corresponding layer index
2255 // in the array fTimeBins
2256 //
2257
2258 Int_t index;
2259
2260 for(Int_t i = 0; i < fN; i++) {
2261 index = fLayers[i]->GetTimeBinIndex();
2262
2263 // printf("gtb %d -> pl %d -> x %f \n", index, i, fLayers[i]->GetX());
2264
2265 if(index < 0) continue;
2266 if(index >= (Int_t) kMaxTimeBinIndex) {
2267 printf("*** AliTRDtracker::MapTimeBinLayers: \n");
2268 printf(" index %d exceeds allowed maximum of %d!\n",
2269 index, kMaxTimeBinIndex-1);
2270 continue;
2271 }
2272 fTimeBinIndex[index] = i;
2273 }
2274
2275 Double_t x1, dx1, x2, dx2, gap;
2276
2277 for(Int_t i = 0; i < fN-1; i++) {
2278 x1 = fLayers[i]->GetX();
2279 dx1 = fLayers[i]->GetdX();
2280 x2 = fLayers[i+1]->GetX();
2281 dx2 = fLayers[i+1]->GetdX();
2282 gap = (x2 - dx2/2) - (x1 + dx1/2);
2283 if(gap < -0.01) {
2284 printf("*** warning: layers %d and %d are overlayed:\n",i,i+1);
2285 printf(" %f + %f + %f > %f\n", x1, dx1/2, dx2/2, x2);
2286 }
2287 if(gap > 0.01) {
2288 printf("*** warning: layers %d and %d have a large gap:\n",i,i+1);
2289 printf(" (%f - %f) - (%f + %f) = %f\n",
2290 x2, dx2/2, x1, dx1, gap);
2291 }
2292 }
2293}
2294
2295
2296//______________________________________________________
2297
2298
2299Int_t AliTRDtracker::AliTRDtrackingSector::GetLayerNumber(Double_t x) const
2300{
2301 //
2302 // Returns the number of time bin which in radial position is closest to <x>
2303 //
2304
2305 if(x >= fLayers[fN-1]->GetX()) return fN-1;
2306 if(x <= fLayers[0]->GetX()) return 0;
2307
2308 Int_t b=0, e=fN-1, m=(b+e)/2;
2309 for (; b<e; m=(b+e)/2) {
2310 if (x > fLayers[m]->GetX()) b=m+1;
2311 else e=m;
2312 }
2313 if(TMath::Abs(x - fLayers[m]->GetX()) >
2314 TMath::Abs(x - fLayers[m+1]->GetX())) return m+1;
2315 else return m;
2316
2317}
2318
2319//______________________________________________________
2320
2321Int_t AliTRDtracker::AliTRDtrackingSector::GetInnerTimeBin() const
2322{
2323 //
2324 // Returns number of the innermost SENSITIVE propagation layer
2325 //
2326
2327 return GetLayerNumber(0);
2328}
2329
2330//______________________________________________________
2331
2332Int_t AliTRDtracker::AliTRDtrackingSector::GetOuterTimeBin() const
2333{
2334 //
2335 // Returns number of the outermost SENSITIVE time bin
2336 //
2337
2338 return GetLayerNumber(GetNumberOfTimeBins() - 1);
2339}
2340
2341//______________________________________________________
2342
2343Int_t AliTRDtracker::AliTRDtrackingSector::GetNumberOfTimeBins() const
2344{
2345 //
2346 // Returns number of SENSITIVE time bins
2347 //
2348
2349 Int_t tb, layer;
2350 for(tb = kMaxTimeBinIndex-1; tb >=0; tb--) {
2351 layer = GetLayerNumber(tb);
2352 if(layer>=0) break;
2353 }
2354 return tb+1;
2355}
2356
2357//______________________________________________________
2358
2359void AliTRDtracker::AliTRDtrackingSector::InsertLayer(AliTRDpropagationLayer* pl)
2360{
2361 //
2362 // Insert layer <pl> in fLayers array.
2363 // Layers are sorted according to X coordinate.
2364
2365 if ( fN == ((Int_t) kMaxLayersPerSector)) {
2366 printf("AliTRDtrackingSector::InsertLayer(): Too many layers !\n");
2367 return;
2368 }
2369 if (fN==0) {fLayers[fN++] = pl; return;}
2370 Int_t i=Find(pl->GetX());
2371
2372 memmove(fLayers+i+1 ,fLayers+i,(fN-i)*sizeof(AliTRDpropagationLayer*));
2373 fLayers[i]=pl; fN++;
2374
2375}
2376
2377//______________________________________________________
2378
2379Int_t AliTRDtracker::AliTRDtrackingSector::Find(Double_t x) const
2380{
2381 //
2382 // Returns index of the propagation layer nearest to X
2383 //
2384
2385 if (x <= fLayers[0]->GetX()) return 0;
2386 if (x > fLayers[fN-1]->GetX()) return fN;
2387 Int_t b=0, e=fN-1, m=(b+e)/2;
2388 for (; b<e; m=(b+e)/2) {
2389 if (x > fLayers[m]->GetX()) b=m+1;
2390 else e=m;
2391 }
2392 return m;
2393}
2394
2395//______________________________________________________
2396void AliTRDtracker::AliTRDpropagationLayer::SetZ(Double_t* center, Double_t *w, Double_t *wsensitive )
2397{
2398 //
2399 // set centers and the width of sectors
2400 for (Int_t icham=0;icham< AliTRDgeometry::kNcham;icham++){
2401 fZc[icham] = center[icham];
2402 fZmax[icham] = w[icham];
2403 fZmaxSensitive[icham] = wsensitive[icham];
2404 // printf("chamber\t%d\tzc\t%f\tzmax\t%f\tzsens\t%f\n",icham,fZc[icham],fZmax[icham],fZmaxSensitive[icham]);
2405 }
2406}
2407//______________________________________________________
2408
2409void AliTRDtracker::AliTRDpropagationLayer::SetHoles(Bool_t *holes)
2410{
2411 //
2412 // set centers and the width of sectors
2413 fHole = kFALSE;
2414 for (Int_t icham=0;icham< AliTRDgeometry::kNcham;icham++){
2415 fIsHole[icham] = holes[icham];
2416 if (holes[icham]) fHole = kTRUE;
2417 }
2418}
2419
2420
2421
2422void AliTRDtracker::AliTRDpropagationLayer::GetPropagationParameters(
2423 Double_t y, Double_t z, Double_t &dx, Double_t &rho, Double_t &radLength,
2424 Bool_t &lookForCluster) const
2425{
2426 //
2427 // Returns radial step <dx>, density <rho>, rad. length <radLength>,
2428 // and sensitivity <lookForCluster> in point <y,z>
2429 //
2430
2431 dx = fdX;
2432 rho = fRho;
2433 radLength = fX0;
2434 lookForCluster = kFALSE;
2435 //
2436 // check dead regions in sensitive volume
2437 if(fTimeBinIndex >= 0) {
2438 //
2439 Int_t zone=-1;
2440 for(Int_t ch = 0; ch < (Int_t) kZones; ch++) {
2441 if (TMath::Abs(z - fZc[ch]) < fZmaxSensitive[ch]){
2442 zone = ch;
2443 lookForCluster = !(fIsHole[zone]);
2444 if(TMath::Abs(y) > fYmaxSensitive){
2445 lookForCluster = kFALSE;
2446 }
2447 if (fIsHole[zone]) {
2448 //if hole
2449 rho = 1.29e-3;
2450 radLength = 36.66;
2451 }
2452 }
2453 }
2454 return;
2455 }
2456 //
2457 //
2458 // check hole
2459 if (fHole==kFALSE) return;
2460 //
2461 for(Int_t ch = 0; ch < (Int_t) kZones; ch++) {
2462 if (TMath::Abs(z - fZc[ch]) < fZmax[ch]){
2463 if (fIsHole[ch]) {
2464 //if hole
2465 rho = 1.29e-3;
2466 radLength = 36.66;
2467 }
2468 }
2469 }
2470 return;
2471}
2472
2473Int_t AliTRDtracker::AliTRDpropagationLayer::GetZone( Double_t z) const
2474{
2475 //
2476 //
2477 if (fTimeBinIndex < 0) return -20; //unknown
2478 Int_t zone=-10; // dead zone
2479 for(Int_t ch = 0; ch < (Int_t) kZones; ch++) {
2480 if(TMath::Abs(z - fZc[ch]) < fZmax[ch])
2481 zone = ch;
2482 }
2483 return zone;
2484}
2485
2486
2487//______________________________________________________
2488
2489void AliTRDtracker::AliTRDpropagationLayer::InsertCluster(AliTRDcluster* c,
2490 UInt_t index) {
2491
2492// Insert cluster in cluster array.
2493// Clusters are sorted according to Y coordinate.
2494
2495 if(fTimeBinIndex < 0) {
2496 printf("*** attempt to insert cluster into non-sensitive time bin!\n");
2497 return;
2498 }
2499
2500 if (fN== (Int_t) kMaxClusterPerTimeBin) {
2501 printf("AliTRDpropagationLayer::InsertCluster(): Too many clusters !\n");
2502 return;
2503 }
2504 if (fN==0) {fIndex[0]=index; fClusters[fN++]=c; return;}
2505 Int_t i=Find(c->GetY());
2506 memmove(fClusters+i+1 ,fClusters+i,(fN-i)*sizeof(AliTRDcluster*));
2507 memmove(fIndex +i+1 ,fIndex +i,(fN-i)*sizeof(UInt_t));
2508 fIndex[i]=index; fClusters[i]=c; fN++;
2509}
2510
2511//______________________________________________________
2512
2513Int_t AliTRDtracker::AliTRDpropagationLayer::Find(Double_t y) const {
2514
2515// Returns index of the cluster nearest in Y
2516
2517 if (y <= fClusters[0]->GetY()) return 0;
2518 if (y > fClusters[fN-1]->GetY()) return fN;
2519 Int_t b=0, e=fN-1, m=(b+e)/2;
2520 for (; b<e; m=(b+e)/2) {
2521 if (y > fClusters[m]->GetY()) b=m+1;
2522 else e=m;
2523 }
2524 return m;
2525}
2526
2527//---------------------------------------------------------
2528
2529Double_t AliTRDtracker::GetTiltFactor(const AliTRDcluster* c) {
2530//
2531// Returns correction factor for tilted pads geometry
2532//
2533
2534 Double_t h01 = sin(TMath::Pi() / 180.0 * fPar->GetTiltingAngle());
2535 Int_t det = c->GetDetector();
2536 Int_t plane = fGeom->GetPlane(det);
2537
2538 //if((plane == 1) || (plane == 3) || (plane == 5)) h01=-h01;
2539 if((plane == 0) || (plane == 2) || (plane == 4)) h01=-h01;
2540
2541 if(fNoTilt) h01 = 0;
2542
2543 return h01;
2544}
2545
2546
2547void AliTRDtracker::CookdEdxTimBin(AliTRDtrack& TRDtrack)
2548{
2549 // *** ADDED TO GET MORE INFORMATION FOR TRD PID ---- PS
2550 // This is setting fdEdxPlane and fTimBinPlane
2551 // Sums up the charge in each plane for track TRDtrack and also get the
2552 // Time bin for Max. Cluster
2553 // Prashant Shukla (shukla@physi.uni-heidelberg.de)
2554
2555 // const Int_t kNPlane = AliTRDgeometry::Nplan();
2556 // const Int_t kNPlane = 6;
2557 Double_t clscharge[kNPlane], maxclscharge[kNPlane];
2558 Int_t nCluster[kNPlane], timebin[kNPlane];
2559
2560 //Initialization of cluster charge per plane.
2561 for (Int_t iPlane = 0; iPlane < kNPlane; iPlane++) {
2562 clscharge[iPlane] = 0.0;
2563 nCluster[iPlane] = 0;
2564 timebin[iPlane] = -1;
2565 maxclscharge[iPlane] = 0.0;
2566 }
2567
2568 // Loop through all clusters associated to track TRDtrack
2569 Int_t nClus = TRDtrack.GetNumberOfClusters(); // from Kalmantrack
2570 for (Int_t iClus = 0; iClus < nClus; iClus++) {
2571 Double_t charge = TRDtrack.GetClusterdQdl(iClus);
2572 Int_t index = TRDtrack.GetClusterIndex(iClus);
2573 AliTRDcluster *TRDcluster = (AliTRDcluster *) GetCluster(index);
2574 if (!TRDcluster) continue;
2575 Int_t tb = TRDcluster->GetLocalTimeBin();
2576 if (!tb) continue;
2577 Int_t detector = TRDcluster->GetDetector();
2578 Int_t iPlane = fGeom->GetPlane(detector);
2579 clscharge[iPlane] = clscharge[iPlane]+charge;
2580 if(charge > maxclscharge[iPlane]) {
2581 maxclscharge[iPlane] = charge;
2582 timebin[iPlane] = tb;
2583 }
2584 nCluster[iPlane]++;
2585 } // end of loop over cluster
2586
2587 // Setting the fdEdxPlane and fTimBinPlane variabales
2588 Double_t Total_ch = 0;
2589 for (Int_t iPlane = 0; iPlane < kNPlane; iPlane++) {
2590 if (nCluster[iPlane]) clscharge[iPlane] /= nCluster[iPlane];
2591 TRDtrack.SetPIDsignals(clscharge[iPlane], iPlane);
2592 TRDtrack.SetPIDTimBin(timebin[iPlane], iPlane);
2593 Total_ch= Total_ch+clscharge[iPlane];
2594 }
2595 // Int_t i;
2596 // Int_t nc=TRDtrack.GetNumberOfClusters();
2597 // Float_t dedx=0;
2598 // for (i=0; i<nc; i++) dedx += TRDtrack.GetClusterdQdl(i);
2599 // dedx /= nc;
2600 // for (Int_t iPlane = 0; iPlane < kNPlane; iPlane++) {
2601 // TRDtrack.SetPIDsignals(dedx, iPlane);
2602 // TRDtrack.SetPIDTimBin(timbin[iPlane], iPlane);
2603 // }
2604
2605} // end of function
2606
2607
2608
2609
2610