1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
18 ///////////////////////////////////////////////////////////////////////////////
20 // The standard TRD tracker //
22 ///////////////////////////////////////////////////////////////////////////////
24 #include <Riostream.h>
28 #include <TObjArray.h>
30 #include "AliTRDgeometry.h"
31 #include "AliTRDparameter.h"
32 #include "AliTRDgeometryHole.h"
33 #include "AliTRDcluster.h"
34 #include "AliTRDtrack.h"
35 #include "AliBarrelTrack.h"
38 #include "AliTRDtracker.h"
40 ClassImp(AliTRDtracker)
42 const Float_t AliTRDtracker::fgkSeedDepth = 0.5;
43 const Float_t AliTRDtracker::fgkSeedStep = 0.10;
44 const Float_t AliTRDtracker::fgkSeedGap = 0.25;
46 const Float_t AliTRDtracker::fgkMaxSeedDeltaZ12 = 40.;
47 const Float_t AliTRDtracker::fgkMaxSeedDeltaZ = 25.;
48 const Float_t AliTRDtracker::fgkMaxSeedC = 0.0052;
49 const Float_t AliTRDtracker::fgkMaxSeedTan = 1.2;
50 const Float_t AliTRDtracker::fgkMaxSeedVertexZ = 150.;
52 const Double_t AliTRDtracker::fgkSeedErrorSY = 0.2;
53 const Double_t AliTRDtracker::fgkSeedErrorSY3 = 2.5;
54 const Double_t AliTRDtracker::fgkSeedErrorSZ = 0.1;
56 const Float_t AliTRDtracker::fgkMinClustersInSeed = 0.7;
58 const Float_t AliTRDtracker::fgkMinClustersInTrack = 0.5;
59 const Float_t AliTRDtracker::fgkMinFractionOfFoundClusters = 0.8;
61 const Float_t AliTRDtracker::fgkSkipDepth = 0.3;
62 const Float_t AliTRDtracker::fgkLabelFraction = 0.8;
63 const Float_t AliTRDtracker::fgkWideRoad = 20.;
65 const Double_t AliTRDtracker::fgkMaxChi2 = 12.;
67 const Int_t AliTRDtracker::fgkFirstPlane = 5;
68 const Int_t AliTRDtracker::fgkLastPlane = 17;
71 //____________________________________________________________________
72 AliTRDtracker::AliTRDtracker():AliTracker(),
89 // Default constructor
91 for(Int_t i=0;i<kTrackingSectors;i++) fTrSec[i]=0;
92 for(Int_t j=0;j<5;j++)
93 for(Int_t k=0;k<18;k++) fHoles[j][k]=kFALSE;
95 //____________________________________________________________________
96 AliTRDtracker::AliTRDtracker(const TFile *geomfile):AliTracker()
102 //Float_t fTzero = 0;
104 fAddTRDseeds = kFALSE;
108 TDirectory *savedir=gDirectory;
109 TFile *in=(TFile*)geomfile;
111 printf("AliTRDtracker::AliTRDtracker(): geometry file is not open!\n");
112 printf(" DETAIL TRD geometry and DEFAULT TRD parameter will be used\n");
117 fGeom = (AliTRDgeometry*) in->Get("TRDgeometry");
118 fPar = (AliTRDparameter*) in->Get("TRDparameter");
123 // fTzero = geo->GetT0();
124 printf("Found geometry version %d on file \n", fGeom->IsVersion());
127 printf("AliTRDtracker::AliTRDtracker(): can't find TRD geometry!\n");
128 //printf("The DETAIL TRD geometry will be used\n");
129 //fGeom = new AliTRDgeometryDetail();
130 fGeom = new AliTRDgeometryHole();
131 fGeom->SetPHOShole();
132 fGeom->SetRICHhole();
136 printf("AliTRDtracker::AliTRDtracker(): can't find TRD parameter!\n");
137 printf("The DEFAULT TRD parameter will be used\n");
138 fPar = new AliTRDparameter();
145 // fGeom->SetT0(fTzero);
148 fClusters = new TObjArray(2000);
150 fSeeds = new TObjArray(2000);
152 fTracks = new TObjArray(1000);
154 for(Int_t geomS = 0; geomS < kTrackingSectors; geomS++) {
155 Int_t trS = CookSectorIndex(geomS);
156 fTrSec[trS] = new AliTRDtrackingSector(fGeom, geomS, fPar);
157 for (Int_t icham=0;icham<AliTRDgeometry::kNcham; icham++){
158 fHoles[icham][trS]=fGeom->IsHole(0,icham,geomS);
162 Float_t tiltAngle = TMath::Abs(fPar->GetTiltingAngle());
163 if(tiltAngle < 0.1) {
170 if(fNoTilt && (tiltAngle > 0.1)) fSY2corr = fSY2corr + tiltAngle * 0.05;
173 // calculate max gap on track
175 Double_t dxAmp = (Double_t) fGeom->CamHght(); // Amplification region
176 Double_t dxDrift = (Double_t) fGeom->CdrHght(); // Drift region
178 Double_t dx = (Double_t) fPar->GetTimeBinSize();
179 Int_t tbAmp = fPar->GetTimeBefore();
180 Int_t maxAmp = (Int_t) ((dxAmp+0.000001)/dx);
181 if(kTRUE) maxAmp = 0; // intentional until we change the parameter class
182 Int_t tbDrift = fPar->GetTimeMax();
183 Int_t maxDrift = (Int_t) ((dxDrift+0.000001)/dx);
185 tbDrift = TMath::Min(tbDrift,maxDrift);
186 tbAmp = TMath::Min(tbAmp,maxAmp);
188 fTimeBinsPerPlane = tbAmp + tbDrift;
189 fMaxGap = (Int_t) (fTimeBinsPerPlane * fGeom->Nplan() * fgkSkipDepth);
194 // Barrel Tracks [SR, 03.04.2003]
204 //___________________________________________________________________
205 AliTRDtracker::~AliTRDtracker()
208 // Destructor of AliTRDtracker
226 for(Int_t geomS = 0; geomS < kTrackingSectors; geomS++) {
227 delete fTrSec[geomS];
231 //_____________________________________________________________________
233 void AliTRDtracker::SetBarrelTree(const char *mode) {
238 if (!IsStoringBarrel()) return;
240 TDirectory *sav = gDirectory;
241 if (!fBarrelFile) fBarrelFile = new TFile("AliBarrelTracks.root", "UPDATE");
244 sprintf(buff, "BarrelTRD_%d_%s", GetEventNumber(), mode);
247 fBarrelTree = new TTree(buff, "Barrel TPC tracks");
249 Int_t nRefs = fgkLastPlane - fgkFirstPlane + 1;
251 if (!fBarrelArray) fBarrelArray = new TClonesArray("AliBarrelTrack", nRefs);
252 for(Int_t i=0; i<nRefs; i++) new((*fBarrelArray)[i]) AliBarrelTrack();
254 fBarrelTree->Branch("tracks", &fBarrelArray);
258 //_____________________________________________________________________
260 void AliTRDtracker::StoreBarrelTrack(AliTRDtrack *ps, Int_t refPlane, Int_t isIn) {
265 if (!IsStoringBarrel()) return;
267 static Int_t nClusters;
269 static Double_t chi2;
271 static Bool_t wasLast = kTRUE;
273 Int_t newClusters, newWrong;
278 fBarrelArray->Clear();
279 nClusters = nWrong = 0;
285 fBarrelTrack = (AliBarrelTrack*)(*fBarrelArray)[index++];
286 ps->GetBarrelTrack(fBarrelTrack);
288 newClusters = ps->GetNumberOfClusters() - nClusters;
289 newWrong = ps->GetNWrong() - nWrong;
290 newChi2 = ps->GetChi2() - chi2;
292 nClusters = ps->GetNumberOfClusters();
293 nWrong = ps->GetNWrong();
294 chi2 = ps->GetChi2();
296 if (refPlane != fgkLastPlane) {
297 fBarrelTrack->SetNClusters(newClusters, newChi2);
298 fBarrelTrack->SetNWrongClusters(newWrong);
303 fBarrelTrack->SetRefPlane(refPlane, isIn);
306 //_____________________________________________________________________
308 Bool_t AliTRDtracker::AdjustSector(AliTRDtrack *track) {
310 // Rotates the track when necessary
313 Double_t alpha = AliTRDgeometry::GetAlpha();
314 Double_t y = track->GetY();
315 Double_t ymax = track->GetX()*TMath::Tan(0.5*alpha);
317 //Int_t ns = AliTRDgeometry::kNsect;
318 //Int_t s=Int_t(track->GetAlpha()/alpha)%ns;
322 if (!track->Rotate(alpha)) return kFALSE;
323 } else if (y <-ymax) {
325 if (!track->Rotate(-alpha)) return kFALSE;
331 //_____________________________________________________________________
332 inline Double_t f1trd(Double_t x1,Double_t y1,
333 Double_t x2,Double_t y2,
334 Double_t x3,Double_t y3)
337 // Initial approximation of the track curvature
339 Double_t d=(x2-x1)*(y3-y2)-(x3-x2)*(y2-y1);
340 Double_t a=0.5*((y3-y2)*(y2*y2-y1*y1+x2*x2-x1*x1)-
341 (y2-y1)*(y3*y3-y2*y2+x3*x3-x2*x2));
342 Double_t b=0.5*((x2-x1)*(y3*y3-y2*y2+x3*x3-x2*x2)-
343 (x3-x2)*(y2*y2-y1*y1+x2*x2-x1*x1));
345 Double_t xr=TMath::Abs(d/(d*x1-a)), yr=d/(d*y1-b);
347 return -xr*yr/sqrt(xr*xr+yr*yr);
350 //_____________________________________________________________________
351 inline Double_t f2trd(Double_t x1,Double_t y1,
352 Double_t x2,Double_t y2,
353 Double_t x3,Double_t y3)
356 // Initial approximation of the track curvature times X coordinate
357 // of the center of curvature
360 Double_t d=(x2-x1)*(y3-y2)-(x3-x2)*(y2-y1);
361 Double_t a=0.5*((y3-y2)*(y2*y2-y1*y1+x2*x2-x1*x1)-
362 (y2-y1)*(y3*y3-y2*y2+x3*x3-x2*x2));
363 Double_t b=0.5*((x2-x1)*(y3*y3-y2*y2+x3*x3-x2*x2)-
364 (x3-x2)*(y2*y2-y1*y1+x2*x2-x1*x1));
366 Double_t xr=TMath::Abs(d/(d*x1-a)), yr=d/(d*y1-b);
368 return -a/(d*y1-b)*xr/sqrt(xr*xr+yr*yr);
371 //_____________________________________________________________________
372 inline Double_t f3trd(Double_t x1,Double_t y1,
373 Double_t x2,Double_t y2,
374 Double_t z1,Double_t z2)
377 // Initial approximation of the tangent of the track dip angle
380 return (z1 - z2)/sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
384 AliTRDcluster * AliTRDtracker::GetCluster(AliTRDtrack * track, Int_t plane, Int_t timebin){
386 //try to find cluster in the backup list
388 AliTRDcluster * cl =0;
389 UInt_t *indexes = track->GetBackupIndexes();
390 for (UInt_t i=0;i<kMaxTimeBinIndex;i++){
391 if (indexes[i]==0) break;
392 AliTRDcluster * cli = (AliTRDcluster*)fClusters->UncheckedAt(indexes[i]);
394 if (cli->GetLocalTimeBin()!=timebin) continue;
395 Int_t iplane = fGeom->GetPlane(cli->GetDetector());
405 Int_t AliTRDtracker::GetLastPlane(AliTRDtrack * track){
407 //return last updated plane
409 UInt_t *indexes = track->GetBackupIndexes();
410 for (UInt_t i=0;i<kMaxTimeBinIndex;i++){
411 AliTRDcluster * cli = (AliTRDcluster*)fClusters->UncheckedAt(indexes[i]);
413 Int_t iplane = fGeom->GetPlane(cli->GetDetector());
414 if (iplane>lastplane) {
420 //___________________________________________________________________
421 Int_t AliTRDtracker::Clusters2Tracks(AliESD* event)
424 // Finds tracks within the TRD. The ESD event is expected to contain seeds
425 // at the outer part of the TRD. The seeds
426 // are found within the TRD if fAddTRDseeds is TRUE.
427 // The tracks are propagated to the innermost time bin
428 // of the TRD and the ESD event is updated
431 Int_t timeBins = fTrSec[0]->GetNumberOfTimeBins();
432 Float_t foundMin = fgkMinClustersInTrack * timeBins;
435 Int_t innerTB = fTrSec[0]->GetInnerTimeBin();
437 Int_t n = event->GetNumberOfTracks();
438 for (Int_t i=0; i<n; i++) {
439 AliESDtrack* seed=event->GetTrack(i);
440 ULong_t status=seed->GetStatus();
441 if ( (status & AliESDtrack::kTRDout ) == 0 ) continue;
442 if ( (status & AliESDtrack::kTRDin) != 0 ) continue;
445 AliTRDtrack* seed2 = new AliTRDtrack(*seed);
446 //seed2->ResetCovariance();
447 AliTRDtrack *pt = new AliTRDtrack(*seed2,seed2->GetAlpha());
449 FollowProlongation(t, innerTB);
450 if (t.GetNumberOfClusters() >= foundMin) {
452 CookLabel(pt, 1-fgkLabelFraction);
456 // cout<<found<<'\r';
458 if(PropagateToTPC(t)) {
459 seed->UpdateTrackParams(pt, AliESDtrack::kTRDin);
465 cout<<"Number of loaded seeds: "<<nseed<<endl;
466 cout<<"Number of found tracks from loaded seeds: "<<found<<endl;
468 // after tracks from loaded seeds are found and the corresponding
469 // clusters are used, look for additional seeds from TRD
472 // Find tracks for the seeds in the TRD
473 Int_t timeBins = fTrSec[0]->GetNumberOfTimeBins();
475 Int_t nSteps = (Int_t) (fgkSeedDepth / fgkSeedStep);
476 Int_t gap = (Int_t) (timeBins * fgkSeedGap);
477 Int_t step = (Int_t) (timeBins * fgkSeedStep);
479 // make a first turn with tight cut on initial curvature
480 for(Int_t turn = 1; turn <= 2; turn++) {
482 nSteps = (Int_t) (fgkSeedDepth / (3*fgkSeedStep));
483 step = (Int_t) (timeBins * (3*fgkSeedStep));
485 for(Int_t i=0; i<nSteps; i++) {
486 Int_t outer=timeBins-1-i*step;
487 Int_t inner=outer-gap;
489 nseed=fSeeds->GetEntriesFast();
491 MakeSeeds(inner, outer, turn);
493 nseed=fSeeds->GetEntriesFast();
494 // printf("\n turn %d, step %d: number of seeds for TRD inward %d\n",
497 for (Int_t i=0; i<nseed; i++) {
498 AliTRDtrack *pt=(AliTRDtrack*)fSeeds->UncheckedAt(i), &t=*pt;
499 FollowProlongation(t,innerTB);
500 if (t.GetNumberOfClusters() >= foundMin) {
502 CookLabel(pt, 1-fgkLabelFraction);
505 // cout<<found<<'\r';
506 if(PropagateToTPC(t)) {
508 track.UpdateTrackParams(pt,AliESDtrack::kTRDin);
509 event->AddTrack(&track);
510 // track.SetTRDtrack(new AliTRDtrack(*pt));
513 delete fSeeds->RemoveAt(i);
520 cout<<"Total number of found tracks: "<<found<<endl;
527 //_____________________________________________________________________________
528 Int_t AliTRDtracker::PropagateBack(AliESD* event) {
530 // Gets seeds from ESD event. The seeds are AliTPCtrack's found and
531 // backpropagated by the TPC tracker. Each seed is first propagated
532 // to the TRD, and then its prolongation is searched in the TRD.
533 // If sufficiently long continuation of the track is found in the TRD
534 // the track is updated, otherwise it's stored as originaly defined
535 // by the TPC tracker.
539 Float_t foundMin = 20;
541 Int_t n = event->GetNumberOfTracks();
542 for (Int_t i=0; i<n; i++) {
543 AliESDtrack* seed=event->GetTrack(i);
544 ULong_t status=seed->GetStatus();
545 if ( (status & AliESDtrack::kTPCout ) == 0 ) continue;
546 if ( (status & AliESDtrack::kTRDout) != 0 ) continue;
548 Int_t lbl = seed->GetLabel();
549 AliTRDtrack *track = new AliTRDtrack(*seed);
550 track->SetSeedLabel(lbl);
551 seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup); //make backup
553 Float_t p4 = track->GetC();
555 Int_t expectedClr = FollowBackProlongation(*track);
557 // only debug purpose
558 if (track->GetNumberOfClusters()<expectedClr/3){
559 AliTRDtrack *track1 = new AliTRDtrack(*seed);
560 track1->SetSeedLabel(lbl);
561 FollowBackProlongation(*track1);
562 AliTRDtrack *track2= new AliTRDtrack(*seed);
563 track->SetSeedLabel(lbl);
564 FollowBackProlongation(*track2);
569 if (TMath::Abs(track->GetC()-p4)/TMath::Abs(p4)>0.2) {
571 continue; //too big change of curvature - to be checked
574 Int_t foundClr = track->GetNumberOfClusters();
575 if (foundClr >= foundMin) {
576 track->CookdEdx(0.,1.);
577 CookdEdxTimBin(*track);
579 CookLabel(track, 1-fgkLabelFraction);
580 if(track->GetChi2()/track->GetNumberOfClusters()<6) { // sign only gold tracks
583 Bool_t isGold = kFALSE;
585 if (track->GetChi2()/track->GetNumberOfClusters()<5) { //full gold track
586 seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup);
589 if (!isGold && track->GetNCross()==0&&track->GetChi2()/track->GetNumberOfClusters()<7){ //almost gold track
590 seed->UpdateTrackParams(track, AliESDtrack::kTRDbackup);
593 if (!isGold && track->GetBackupTrack()){
594 if (track->GetBackupTrack()->GetNumberOfClusters()>foundMin&&
595 (track->GetBackupTrack()->GetChi2()/(track->GetBackupTrack()->GetNumberOfClusters()+1))<7){
596 seed->UpdateTrackParams(track->GetBackupTrack(), AliESDtrack::kTRDbackup);
607 if (track->GetStop()==kFALSE){
610 Double_t c2=track->GetC()*xtof - track->GetEta();
611 if (TMath::Abs(c2)>=0.85) {
615 Double_t xTOF0 = 371. ;
616 PropagateToOuterPlane(*track,xTOF0);
618 Double_t ymax=xtof*TMath::Tan(0.5*AliTRDgeometry::GetAlpha());
619 Double_t y=track->GetYat(xtof);
621 if (!track->Rotate(AliTRDgeometry::GetAlpha())) {
625 } else if (y <-ymax) {
626 if (!track->Rotate(-AliTRDgeometry::GetAlpha())) {
632 if (track->PropagateTo(xtof)) {
633 seed->UpdateTrackParams(track, AliESDtrack::kTRDout);
634 for (Int_t i=0;i<kNPlane;i++) {
635 seed->SetTRDsignals(track->GetPIDsignals(i),i);
636 seed->SetTRDTimBin(track->GetPIDTimBin(i),i);
638 seed->SetTRDtrack(new AliTRDtrack(*track));
639 if (track->GetNumberOfClusters()>foundMin) found++;
642 if (track->GetNumberOfClusters()>15&&track->GetNumberOfClusters()>0.5*expectedClr){
643 seed->UpdateTrackParams(track, AliESDtrack::kTRDout);
644 //seed->SetStatus(AliESDtrack::kTRDStop);
645 for (Int_t i=0;i<kNPlane;i++) {
646 seed->SetTRDsignals(track->GetPIDsignals(i),i);
647 seed->SetTRDTimBin(track->GetPIDTimBin(i),i);
649 seed->SetTRDtrack(new AliTRDtrack(*track));
656 //End of propagation to the TOF
657 //if (foundClr>foundMin)
658 // seed->UpdateTrackParams(track, AliESDtrack::kTRDout);
663 cerr<<"Number of seeds: "<<fNseeds<<endl;
664 cerr<<"Number of back propagated TRD tracks: "<<found<<endl;
666 fSeeds->Clear(); fNseeds=0;
672 //_____________________________________________________________________________
673 Int_t AliTRDtracker::RefitInward(AliESD* event)
676 // Refits tracks within the TRD. The ESD event is expected to contain seeds
677 // at the outer part of the TRD.
678 // The tracks are propagated to the innermost time bin
679 // of the TRD and the ESD event is updated
680 // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch)
683 Int_t timeBins = fTrSec[0]->GetNumberOfTimeBins();
684 Float_t foundMin = fgkMinClustersInTrack * timeBins;
687 Int_t innerTB = fTrSec[0]->GetInnerTimeBin();
689 Int_t n = event->GetNumberOfTracks();
690 for (Int_t i=0; i<n; i++) {
691 AliESDtrack* seed=event->GetTrack(i);
692 AliTRDtrack* seed2 = new AliTRDtrack(*seed);
693 if (seed2->GetX()<270){
694 seed->UpdateTrackParams(seed2, AliESDtrack::kTRDbackup); // backup TPC track - only update
699 ULong_t status=seed->GetStatus();
700 if ( (status & AliESDtrack::kTRDout ) == 0 ) {
704 if ( (status & AliESDtrack::kTRDin) != 0 ) {
709 seed2->ResetCovariance(5.);
710 AliTRDtrack *pt = new AliTRDtrack(*seed2,seed2->GetAlpha());
711 for (Int_t i=0;i<kNPlane;i++) {
712 pt->SetPIDsignals(seed2->GetPIDsignals(i),i);
713 pt->SetPIDTimBin(seed2->GetPIDTimBin(i),i);
716 UInt_t * indexes2 = seed2->GetIndexes();
717 UInt_t * indexes3 = pt->GetBackupIndexes();
718 for (Int_t i=0;i<200;i++) {
719 if (indexes2[i]==0) break;
720 indexes3[i] = indexes2[i];
722 //AliTRDtrack *pt = seed2;
724 FollowProlongation(t, innerTB);
726 if (t.GetNumberOfClusters()<seed->GetTRDclusters(indexes3)*0.5){
727 // debug - why we dont go back?
728 AliTRDtrack *pt2 = new AliTRDtrack(*seed2,seed2->GetAlpha());
729 UInt_t * indexes2 = seed2->GetIndexes();
730 UInt_t * indexes3 = pt2->GetBackupIndexes();
731 for (Int_t i=0;i<200;i++) {
732 if (indexes2[i]==0) break;
733 indexes3[i] = indexes2[i];
735 FollowProlongation(*pt2, innerTB);
739 if (t.GetNumberOfClusters() >= foundMin) {
741 //CookLabel(pt, 1-fgkLabelFraction);
745 // cout<<found<<'\r';
747 if(PropagateToTPC(t)) {
748 seed->UpdateTrackParams(pt, AliESDtrack::kTRDrefit);
749 for (Int_t i=0;i<kNPlane;i++) {
750 seed->SetTRDsignals(pt->GetPIDsignals(i),i);
751 seed->SetTRDTimBin(pt->GetPIDTimBin(i),i);
754 //if not prolongation to TPC - propagate without update
755 AliTRDtrack* seed2 = new AliTRDtrack(*seed);
756 seed2->ResetCovariance(5.);
757 AliTRDtrack *pt2 = new AliTRDtrack(*seed2,seed2->GetAlpha());
759 if (PropagateToTPC(*pt2)) {
760 pt2->CookdEdx(0.,1.);
761 CookdEdxTimBin(*pt2);
762 seed->UpdateTrackParams(pt2, AliESDtrack::kTRDrefit);
763 for (Int_t i=0;i<kNPlane;i++) {
764 seed->SetTRDsignals(seed2->GetPIDsignals(i),i);
765 seed->SetTRDTimBin(seed2->GetPIDTimBin(i),i);
775 cout<<"Number of loaded seeds: "<<nseed<<endl;
776 cout<<"Number of found tracks from loaded seeds: "<<found<<endl;
783 //---------------------------------------------------------------------------
784 Int_t AliTRDtracker::FollowProlongation(AliTRDtrack& t, Int_t rf)
786 // Starting from current position on track=t this function tries
787 // to extrapolate the track up to timeBin=0 and to confirm prolongation
788 // if a close cluster is found. Returns the number of clusters
789 // expected to be found in sensitive layers
791 Float_t wIndex, wTB, wChi2;
792 Float_t wYrt, wYclosest, wYcorrect, wYwindow;
793 Float_t wZrt, wZclosest, wZcorrect, wZwindow;
794 Float_t wPx, wPy, wPz, wC;
796 Float_t wSigmaC2, wSigmaTgl2, wSigmaY2, wSigmaZ2;
797 Int_t lastplane = GetLastPlane(&t);
799 Int_t trackIndex = t.GetLabel();
801 Int_t ns=Int_t(2*TMath::Pi()/AliTRDgeometry::GetAlpha()+0.5);
803 Int_t tryAgain=fMaxGap;
805 Double_t alpha=t.GetAlpha();
806 alpha = TVector2::Phi_0_2pi(alpha);
808 Int_t s=Int_t(alpha/AliTRDgeometry::GetAlpha())%AliTRDgeometry::kNsect;
809 Double_t radLength, rho, x, dx, y, ymax, z;
811 Int_t expectedNumberOfClusters = 0;
812 Bool_t lookForCluster;
814 alpha=AliTRDgeometry::GetAlpha(); // note: change in meaning
817 for (Int_t nr=fTrSec[0]->GetLayerNumber(t.GetX()); nr>rf; nr--) {
819 y = t.GetY(); z = t.GetZ();
821 // first propagate to the inner surface of the current time bin
822 fTrSec[s]->GetLayer(nr)->GetPropagationParameters(y,z,dx,rho,radLength,lookForCluster);
823 x = fTrSec[s]->GetLayer(nr)->GetX()-dx/2; y = t.GetY(); z = t.GetZ();
824 if(!t.PropagateTo(x,radLength,rho)) break;
826 ymax = x*TMath::Tan(0.5*alpha);
829 if (!t.Rotate(alpha)) break;
830 if(!t.PropagateTo(x,radLength,rho)) break;
831 } else if (y <-ymax) {
833 if (!t.Rotate(-alpha)) break;
834 if(!t.PropagateTo(x,radLength,rho)) break;
837 y = t.GetY(); z = t.GetZ();
839 // now propagate to the middle plane of the next time bin
840 fTrSec[s]->GetLayer(nr-1)->GetPropagationParameters(y,z,dx,rho,radLength,lookForCluster);
841 x = fTrSec[s]->GetLayer(nr-1)->GetX(); y = t.GetY(); z = t.GetZ();
842 if(!t.PropagateTo(x,radLength,rho)) break;
844 ymax = x*TMath::Tan(0.5*alpha);
847 if (!t.Rotate(alpha)) break;
848 if(!t.PropagateTo(x,radLength,rho)) break;
849 } else if (y <-ymax) {
851 if (!t.Rotate(-alpha)) break;
852 if(!t.PropagateTo(x,radLength,rho)) break;
858 expectedNumberOfClusters++;
859 wIndex = (Float_t) t.GetLabel();
862 AliTRDpropagationLayer& timeBin=*(fTrSec[s]->GetLayer(nr-1));
864 Double_t sy2=ExpectedSigmaY2(x,t.GetTgl(),t.GetPt());
865 Double_t sz2=ExpectedSigmaZ2(x,t.GetTgl());
868 if((t.GetSigmaY2() + sy2) > 0) road=10.*sqrt(t.GetSigmaY2() + sy2);
869 else return expectedNumberOfClusters;
873 wYwindow = (Float_t) road;
874 t.GetPxPyPz(px,py,pz);
878 wC = (Float_t) t.GetC();
879 wSigmaC2 = (Float_t) t.GetSigmaC2();
880 wSigmaTgl2 = (Float_t) t.GetSigmaTgl2();
881 wSigmaY2 = (Float_t) t.GetSigmaY2();
882 wSigmaZ2 = (Float_t) t.GetSigmaZ2();
889 Double_t maxChi2=fgkMaxChi2;
891 wYclosest = 12345678;
892 wYcorrect = 12345678;
893 wZclosest = 12345678;
894 wZcorrect = 12345678;
895 wZwindow = TMath::Sqrt(2.25 * 12 * sz2);
897 // Find the closest correct cluster for debugging purposes
899 Float_t minDY = 1000000;
900 for (Int_t i=0; i<timeBin; i++) {
901 AliTRDcluster* c=(AliTRDcluster*)(timeBin[i]);
902 if((c->GetLabel(0) != trackIndex) &&
903 (c->GetLabel(1) != trackIndex) &&
904 (c->GetLabel(2) != trackIndex)) continue;
905 if(TMath::Abs(c->GetY() - y) > minDY) continue;
906 minDY = TMath::Abs(c->GetY() - y);
907 wYcorrect = c->GetY();
908 wZcorrect = c->GetZ();
910 Double_t h01 = GetTiltFactor(c);
911 wChi2 = t.GetPredictedChi2(c, h01);
915 // Now go for the real cluster search
919 //find cluster in history
922 AliTRDcluster * cl0 = timeBin[0];
926 Int_t plane = fGeom->GetPlane(cl0->GetDetector());
927 if (plane>lastplane) continue;
928 Int_t timebin = cl0->GetLocalTimeBin();
929 AliTRDcluster * cl2= GetCluster(&t,plane, timebin);
932 Double_t h01 = GetTiltFactor(cl);
933 maxChi2=t.GetPredictedChi2(cl,h01);
935 if ((!cl) && road>fgkWideRoad) {
936 //if (t.GetNumberOfClusters()>4)
937 // cerr<<t.GetNumberOfClusters()
938 // <<"FindProlongation warning: Too broad road !\n";
945 for (Int_t i=timeBin.Find(y-road); i<timeBin; i++) {
946 AliTRDcluster* c=(AliTRDcluster*)(timeBin[i]);
947 if (c->GetY() > y+road) break;
948 if (c->IsUsed() > 0) continue;
949 if((c->GetZ()-z)*(c->GetZ()-z) > 3 * sz2) continue;
951 Double_t h01 = GetTiltFactor(c);
952 Double_t chi2=t.GetPredictedChi2(c,h01);
954 if (chi2 > maxChi2) continue;
957 index=timeBin.GetIndex(i);
963 for (Int_t i=timeBin.Find(y-road); i<timeBin; i++) {
964 AliTRDcluster* c=(AliTRDcluster*)(timeBin[i]);
966 if (c->GetY() > y+road) break;
967 if (c->IsUsed() > 0) continue;
968 if((c->GetZ()-z)*(c->GetZ()-z) > 12 * sz2) continue;
970 Double_t h01 = GetTiltFactor(c);
971 Double_t chi2=t.GetPredictedChi2(c, h01);
973 if (chi2 > maxChi2) continue;
976 index=timeBin.GetIndex(i);
980 wYclosest = cl->GetY();
981 wZclosest = cl->GetZ();
982 Double_t h01 = GetTiltFactor(cl);
984 t.SetSampledEdx(cl->GetQ()/dx,t.GetNumberOfClusters());
985 //printf("Track position\t%f\t%f\t%f\n",t.GetX(),t.GetY(),t.GetZ());
986 //printf("Cluster position\t%d\t%f\t%f\n",cl->GetLocalTimeBin(),cl->GetY(),cl->GetZ());
987 Int_t det = cl->GetDetector();
988 Int_t plane = fGeom->GetPlane(det);
990 if(!t.UpdateMI(cl,maxChi2,index,h01,plane)) {
991 //if(!t.Update(cl,maxChi2,index,h01)) {
992 //if(!tryAgain--) return 0;
994 else tryAgain=fMaxGap;
997 //if (tryAgain==0) break;
1002 if((((Int_t) wTB)%15 == 0) || (((Int_t) wTB)%15 == 14)) {
1004 printf(" %f", wIndex); //1
1005 printf(" %f", wTB); //2
1006 printf(" %f", wYrt); //3
1007 printf(" %f", wYclosest); //4
1008 printf(" %f", wYcorrect); //5
1009 printf(" %f", wYwindow); //6
1010 printf(" %f", wZrt); //7
1011 printf(" %f", wZclosest); //8
1012 printf(" %f", wZcorrect); //9
1013 printf(" %f", wZwindow); //10
1014 printf(" %f", wPx); //11
1015 printf(" %f", wPy); //12
1016 printf(" %f", wPz); //13
1017 printf(" %f", wSigmaC2*1000000); //14
1018 printf(" %f", wSigmaTgl2*1000); //15
1019 printf(" %f", wSigmaY2); //16
1020 // printf(" %f", wSigmaZ2); //17
1021 printf(" %f", wChi2); //17
1022 printf(" %f", wC); //18
1029 return expectedNumberOfClusters;
1034 //___________________________________________________________________
1036 Int_t AliTRDtracker::FollowBackProlongation(AliTRDtrack& t)
1038 // Starting from current radial position of track <t> this function
1039 // extrapolates the track up to outer timebin and in the sensitive
1040 // layers confirms prolongation if a close cluster is found.
1041 // Returns the number of clusters expected to be found in sensitive layers
1044 Float_t wIndex, wTB, wChi2;
1045 Float_t wYrt, wYclosest, wYcorrect, wYwindow;
1046 Float_t wZrt, wZclosest, wZcorrect, wZwindow;
1047 Float_t wPx, wPy, wPz, wC;
1048 Double_t px, py, pz;
1049 Float_t wSigmaC2, wSigmaTgl2, wSigmaY2, wSigmaZ2;
1051 Int_t trackIndex = t.GetLabel();
1052 Int_t tryAgain=fMaxGap;
1054 Double_t alpha=t.GetAlpha();
1055 TVector2::Phi_0_2pi(alpha);
1059 Int_t outerTB = fTrSec[0]->GetOuterTimeBin();
1060 Double_t radLength, rho, x, dx, y, ymax = 0, z;
1061 Bool_t lookForCluster;
1063 Int_t expectedNumberOfClusters = 0;
1066 alpha=AliTRDgeometry::GetAlpha(); // note: change in meaning
1068 Int_t nRefPlane = fgkFirstPlane;
1069 Bool_t isNewLayer = kFALSE;
1075 for (nr=fTrSec[0]->GetLayerNumber(t.GetX()); nr<outerTB+1; nr++) {
1080 // first propagate to the outer surface of the current time bin
1083 fTrSec[s]->GetLayer(nr)->GetPropagationParameters(y,z,dx,rho,radLength,lookForCluster);
1084 x = fTrSec[s]->GetLayer(nr)->GetX()+dx/2;
1088 if(!t.PropagateTo(x,radLength,rho)) break;
1089 // if (!AdjustSector(&t)) break;
1091 // MI -fix untill correct material desription will be implemented
1093 Float_t angle = t.GetAlpha(); // MI - if rotation - we go through the material
1094 if (!AdjustSector(&t)) break;
1095 Int_t cross = kFALSE;
1097 if (TMath::Abs(angle - t.GetAlpha())>0.000001) cross = kTRUE; //better to stop track
1098 Int_t currentzone = fTrSec[s]->GetLayer(nr)->GetZone(z);
1099 if (currentzone==-10) cross = kTRUE; // we are in the frame
1100 if (currentzone>-10){ // layer knows where we are
1101 if (zone==-10) zone = currentzone;
1102 if (zone!=currentzone) cross=kTRUE;
1106 if (t.GetNCross()==1) t.MakeBackupTrack();
1107 if (t.GetNCross()>2) break;
1113 if (!t.PropagateTo(x,radLength,rho)) break;
1118 // Barrel Tracks [SR, 04.04.2003]
1121 if (fTrSec[s]->GetLayer(nr)->IsSensitive() !=
1122 fTrSec[s]->GetLayer(nr+1)->IsSensitive() ) {
1124 // if (IsStoringBarrel()) StoreBarrelTrack(&t, nRefPlane++, kTrackBack);
1127 if (fTrSec[s]->GetLayer(nr-1)->IsSensitive() &&
1128 ! fTrSec[s]->GetLayer(nr)->IsSensitive()) {
1130 } else {isNewLayer = kFALSE;}
1135 // now propagate to the middle plane of the next time bin
1136 fTrSec[s]->GetLayer(nr+1)->GetPropagationParameters(y,z,dx,rho,radLength,lookForCluster);
1138 x = fTrSec[s]->GetLayer(nr+1)->GetX();
1139 if(!t.PropagateTo(x,radLength,rho)) break;
1140 if (!AdjustSector(&t)) break;
1142 if(!t.PropagateTo(x,radLength,rho)) break;
1147 if(fVocal) printf("nr+1=%d, x %f, z %f, y %f, ymax %f\n",nr+1,x,z,y,ymax);
1148 // printf("label %d, pl %d, lookForCluster %d \n",
1149 // trackIndex, nr+1, lookForCluster);
1151 if(lookForCluster) {
1152 expectedNumberOfClusters++;
1154 wIndex = (Float_t) t.GetLabel();
1155 wTB = fTrSec[s]->GetLayer(nr+1)->GetTimeBinIndex();
1157 AliTRDpropagationLayer& timeBin=*(fTrSec[s]->GetLayer(nr+1));
1158 Double_t sy2=ExpectedSigmaY2(t.GetX(),t.GetTgl(),t.GetPt());
1159 Double_t sz2=ExpectedSigmaZ2(t.GetX(),t.GetTgl());
1160 if((t.GetSigmaY2() + sy2) < 0) break;
1161 Double_t road = 10.*sqrt(t.GetSigmaY2() + sy2);
1162 Double_t y=t.GetY(), z=t.GetZ();
1166 wYwindow = (Float_t) road;
1167 t.GetPxPyPz(px,py,pz);
1171 wC = (Float_t) t.GetC();
1172 wSigmaC2 = (Float_t) t.GetSigmaC2();
1173 wSigmaTgl2 = (Float_t) t.GetSigmaTgl2();
1174 wSigmaY2 = (Float_t) t.GetSigmaY2();
1175 wSigmaZ2 = (Float_t) t.GetSigmaZ2();
1178 if (road>fgkWideRoad) {
1179 if (t.GetNumberOfClusters()>4)
1180 cerr<<t.GetNumberOfClusters()
1181 <<"FindProlongation warning: Too broad road !\n";
1185 AliTRDcluster *cl=0;
1188 Double_t maxChi2=fgkMaxChi2;
1193 maxChi2 = 10 * fgkMaxChi2;
1196 if (nRefPlane == fgkFirstPlane) maxChi2 = 20 * fgkMaxChi2;
1197 if (nRefPlane == fgkFirstPlane+2) maxChi2 = 15 * fgkMaxChi2;
1198 if (t.GetNRotate() > 0) maxChi2 = 3 * maxChi2;
1201 wYclosest = 12345678;
1202 wYcorrect = 12345678;
1203 wZclosest = 12345678;
1204 wZcorrect = 12345678;
1205 wZwindow = TMath::Sqrt(2.25 * 12 * sz2);
1207 // Find the closest correct cluster for debugging purposes
1210 for (Int_t i=0; i<timeBin; i++) {
1211 AliTRDcluster* c=(AliTRDcluster*)(timeBin[i]);
1212 if((c->GetLabel(0) != trackIndex) &&
1213 (c->GetLabel(1) != trackIndex) &&
1214 (c->GetLabel(2) != trackIndex)) continue;
1215 if(TMath::Abs(c->GetY() - y) > minDY) continue;
1216 //minDY = TMath::Abs(c->GetY() - y);
1217 minDY = c->GetY() - y;
1218 wYcorrect = c->GetY();
1219 wZcorrect = c->GetZ();
1221 Double_t h01 = GetTiltFactor(c);
1222 wChi2 = t.GetPredictedChi2(c, h01);
1226 // Now go for the real cluster search
1230 for (Int_t i=timeBin.Find(y-road); i<timeBin; i++) {
1231 AliTRDcluster* c=(AliTRDcluster*)(timeBin[i]);
1232 if (c->GetY() > y+road) break;
1233 if (c->IsUsed() > 0) continue;
1234 if((c->GetZ()-z)*(c->GetZ()-z) > 3 * sz2) continue;
1236 Double_t h01 = GetTiltFactor(c);
1237 chi2=t.GetPredictedChi2(c,h01);
1239 if (chi2 > maxChi2) continue;
1242 index=timeBin.GetIndex(i);
1245 if((c->GetLabel(0) != trackIndex) &&
1246 (c->GetLabel(1) != trackIndex) &&
1247 (c->GetLabel(2) != trackIndex)) t.AddNWrong();
1252 for (Int_t i=timeBin.Find(y-road); i<timeBin; i++) {
1253 AliTRDcluster* c=(AliTRDcluster*)(timeBin[i]);
1255 if (c->GetY() > y+road) break;
1256 if (c->IsUsed() > 0) continue;
1257 if((c->GetZ()-z)*(c->GetZ()-z) > 2.25 * 12 * sz2) continue;
1259 Double_t h01 = GetTiltFactor(c);
1260 chi2=t.GetPredictedChi2(c,h01);
1262 if (chi2 > maxChi2) continue;
1265 index=timeBin.GetIndex(i);
1270 wYclosest = cl->GetY();
1271 wZclosest = cl->GetZ();
1273 t.SetSampledEdx(cl->GetQ()/dx,t.GetNumberOfClusters());
1274 Double_t h01 = GetTiltFactor(cl);
1275 Int_t det = cl->GetDetector();
1276 Int_t plane = fGeom->GetPlane(det);
1278 if(!t.UpdateMI(cl,maxChi2,index,h01,plane)) {
1279 //if(!t.Update(cl,maxChi2,index,h01)) {
1280 if(!tryAgain--) return 0;
1282 else tryAgain=fMaxGap;
1285 if (tryAgain==0) break;
1288 //if (minDY < 1000000 && isNewLayer)
1289 //cout << "\t" << nRefPlane << "\t" << "\t" << t.GetNRotate() << "\t" <<
1290 // road << "\t" << minDY << "\t" << chi2 << "\t" << wChi2 << "\t" << maxChi2 << endl;
1294 isNewLayer = kFALSE;
1297 if((((Int_t) wTB)%15 == 0) || (((Int_t) wTB)%15 == 14)) {
1299 printf(" %f", wIndex); //1
1300 printf(" %f", wTB); //2
1301 printf(" %f", wYrt); //3
1302 printf(" %f", wYclosest); //4
1303 printf(" %f", wYcorrect); //5
1304 printf(" %f", wYwindow); //6
1305 printf(" %f", wZrt); //7
1306 printf(" %f", wZclosest); //8
1307 printf(" %f", wZcorrect); //9
1308 printf(" %f", wZwindow); //10
1309 printf(" %f", wPx); //11
1310 printf(" %f", wPy); //12
1311 printf(" %f", wPz); //13
1312 printf(" %f", wSigmaC2*1000000); //14
1313 printf(" %f", wSigmaTgl2*1000); //15
1314 printf(" %f", wSigmaY2); //16
1315 // printf(" %f", wSigmaZ2); //17
1316 printf(" %f", wChi2); //17
1317 printf(" %f", wC); //18
1328 return expectedNumberOfClusters;
1333 //---------------------------------------------------------------------------
1334 Int_t AliTRDtracker::Refit(AliTRDtrack& t, Int_t rf)
1336 // Starting from current position on track=t this function tries
1337 // to extrapolate the track up to timeBin=0 and to reuse already
1338 // assigned clusters. Returns the number of clusters
1339 // expected to be found in sensitive layers
1340 // get indices of assigned clusters for each layer
1341 // Origin: Thomas KUHR (Thomas.Kuhr@cern.ch)
1344 for (Int_t i = 0; i < 90; i++) iCluster[i] = 0;
1345 for (Int_t i = 0; i < t.GetNumberOfClusters(); i++) {
1346 Int_t index = t.GetClusterIndex(i);
1347 AliTRDcluster *cl=(AliTRDcluster*) GetCluster(index);
1349 Int_t detector=cl->GetDetector();
1350 Int_t localTimeBin=cl->GetLocalTimeBin();
1351 Int_t sector=fGeom->GetSector(detector);
1352 Int_t plane=fGeom->GetPlane(detector);
1354 Int_t trackingSector = CookSectorIndex(sector);
1356 Int_t gtb = fTrSec[trackingSector]->CookTimeBinIndex(plane,localTimeBin);
1357 if(gtb < 0) continue;
1358 Int_t layer = fTrSec[trackingSector]->GetLayerNumber(gtb);
1359 iCluster[layer] = index;
1363 Int_t ns=Int_t(2*TMath::Pi()/AliTRDgeometry::GetAlpha()+0.5);
1365 Double_t alpha=t.GetAlpha();
1366 alpha = TVector2::Phi_0_2pi(alpha);
1368 Int_t s=Int_t(alpha/AliTRDgeometry::GetAlpha())%AliTRDgeometry::kNsect;
1369 Double_t radLength, rho, x, dx, y, ymax, z;
1371 Int_t expectedNumberOfClusters = 0;
1372 Bool_t lookForCluster;
1374 alpha=AliTRDgeometry::GetAlpha(); // note: change in meaning
1377 for (Int_t nr=fTrSec[0]->GetLayerNumber(t.GetX()); nr>rf; nr--) {
1379 y = t.GetY(); z = t.GetZ();
1381 // first propagate to the inner surface of the current time bin
1382 fTrSec[s]->GetLayer(nr)->GetPropagationParameters(y,z,dx,rho,radLength,lookForCluster);
1383 x = fTrSec[s]->GetLayer(nr)->GetX()-dx/2; y = t.GetY(); z = t.GetZ();
1384 if(!t.PropagateTo(x,radLength,rho)) break;
1386 ymax = x*TMath::Tan(0.5*alpha);
1389 if (!t.Rotate(alpha)) break;
1390 if(!t.PropagateTo(x,radLength,rho)) break;
1391 } else if (y <-ymax) {
1393 if (!t.Rotate(-alpha)) break;
1394 if(!t.PropagateTo(x,radLength,rho)) break;
1397 y = t.GetY(); z = t.GetZ();
1399 // now propagate to the middle plane of the next time bin
1400 fTrSec[s]->GetLayer(nr-1)->GetPropagationParameters(y,z,dx,rho,radLength,lookForCluster);
1401 x = fTrSec[s]->GetLayer(nr-1)->GetX(); y = t.GetY(); z = t.GetZ();
1402 if(!t.PropagateTo(x,radLength,rho)) break;
1404 ymax = x*TMath::Tan(0.5*alpha);
1407 if (!t.Rotate(alpha)) break;
1408 if(!t.PropagateTo(x,radLength,rho)) break;
1409 } else if (y <-ymax) {
1411 if (!t.Rotate(-alpha)) break;
1412 if(!t.PropagateTo(x,radLength,rho)) break;
1415 if(lookForCluster) expectedNumberOfClusters++;
1417 // use assigned cluster
1418 if (!iCluster[nr-1]) continue;
1419 AliTRDcluster *cl=(AliTRDcluster*)GetCluster(iCluster[nr-1]);
1420 Double_t h01 = GetTiltFactor(cl);
1421 Double_t chi2=t.GetPredictedChi2(cl, h01);
1422 t.SetSampledEdx(cl->GetQ()/dx,t.GetNumberOfClusters());
1423 t.Update(cl,chi2,iCluster[nr-1],h01);
1426 return expectedNumberOfClusters;
1429 //___________________________________________________________________
1431 Int_t AliTRDtracker::PropagateToOuterPlane(AliTRDtrack& t, Double_t xToGo)
1433 // Starting from current radial position of track <t> this function
1434 // extrapolates the track up to radial position <xToGo>.
1435 // Returns 1 if track reaches the plane, and 0 otherwise
1437 Int_t ns=Int_t(2*TMath::Pi()/AliTRDgeometry::GetAlpha()+0.5);
1439 Double_t alpha=t.GetAlpha();
1441 if (alpha > 2.*TMath::Pi()) alpha -= 2.*TMath::Pi();
1442 if (alpha < 0. ) alpha += 2.*TMath::Pi();
1444 Int_t s=Int_t(alpha/AliTRDgeometry::GetAlpha())%AliTRDgeometry::kNsect;
1446 Bool_t lookForCluster;
1447 Double_t radLength, rho, x, dx, y, ymax, z;
1451 alpha=AliTRDgeometry::GetAlpha(); // note: change in meaning
1453 Int_t plToGo = fTrSec[0]->GetLayerNumber(xToGo);
1455 for (Int_t nr=fTrSec[0]->GetLayerNumber(x); nr<plToGo; nr++) {
1457 y = t.GetY(); z = t.GetZ();
1459 // first propagate to the outer surface of the current time bin
1460 fTrSec[s]->GetLayer(nr)->GetPropagationParameters(y,z,dx,rho,radLength,lookForCluster);
1461 x = fTrSec[s]->GetLayer(nr)->GetX()+dx/2; y = t.GetY(); z = t.GetZ();
1462 if(!t.PropagateTo(x,radLength,rho)) return 0;
1464 ymax = x*TMath::Tan(0.5*alpha);
1467 if (!t.Rotate(alpha)) return 0;
1468 } else if (y <-ymax) {
1470 if (!t.Rotate(-alpha)) return 0;
1472 if(!t.PropagateTo(x,radLength,rho)) return 0;
1474 y = t.GetY(); z = t.GetZ();
1476 // now propagate to the middle plane of the next time bin
1477 fTrSec[s]->GetLayer(nr+1)->GetPropagationParameters(y,z,dx,rho,radLength,lookForCluster);
1478 x = fTrSec[s]->GetLayer(nr+1)->GetX(); y = t.GetY(); z = t.GetZ();
1479 if(!t.PropagateTo(x,radLength,rho)) return 0;
1481 ymax = x*TMath::Tan(0.5*alpha);
1484 if (!t.Rotate(alpha)) return 0;
1485 } else if (y <-ymax) {
1487 if (!t.Rotate(-alpha)) return 0;
1489 if(!t.PropagateTo(x,radLength,rho)) return 0;
1494 //___________________________________________________________________
1496 Int_t AliTRDtracker::PropagateToTPC(AliTRDtrack& t)
1498 // Starting from current radial position of track <t> this function
1499 // extrapolates the track up to radial position of the outermost
1500 // padrow of the TPC.
1501 // Returns 1 if track reaches the TPC, and 0 otherwise
1503 //Int_t ns=Int_t(2*TMath::Pi()/AliTRDgeometry::GetAlpha()+0.5);
1505 Double_t alpha=t.GetAlpha();
1506 alpha = TVector2::Phi_0_2pi(alpha);
1508 Int_t s=Int_t(alpha/AliTRDgeometry::GetAlpha())%AliTRDgeometry::kNsect;
1510 Bool_t lookForCluster;
1511 Double_t radLength, rho, x, dx, y, /*ymax,*/ z;
1515 alpha=AliTRDgeometry::GetAlpha(); // note: change in meaning
1516 Int_t plTPC = fTrSec[0]->GetLayerNumber(246.055);
1518 for (Int_t nr=fTrSec[0]->GetLayerNumber(x); nr>plTPC; nr--) {
1523 // first propagate to the outer surface of the current time bin
1524 fTrSec[s]->GetLayer(nr)->GetPropagationParameters(y,z,dx,rho,radLength,lookForCluster);
1525 x = fTrSec[s]->GetLayer(nr)->GetX()-dx/2;
1527 if(!t.PropagateTo(x,radLength,rho)) return 0;
1529 if(!t.PropagateTo(x,radLength,rho)) return 0;
1534 // now propagate to the middle plane of the next time bin
1535 fTrSec[s]->GetLayer(nr-1)->GetPropagationParameters(y,z,dx,rho,radLength,lookForCluster);
1536 x = fTrSec[s]->GetLayer(nr-1)->GetX();
1538 if(!t.PropagateTo(x,radLength,rho)) return 0;
1540 if(!t.PropagateTo(x,radLength,rho)) return 0;
1545 //_____________________________________________________________________________
1546 Int_t AliTRDtracker::LoadClusters(TTree *cTree)
1548 // Fills clusters into TRD tracking_sectors
1549 // Note that the numbering scheme for the TRD tracking_sectors
1550 // differs from that of TRD sectors
1552 if (ReadClusters(fClusters,cTree)) {
1553 Error("LoadClusters","Problem with reading the clusters !");
1556 Int_t ncl=fClusters->GetEntriesFast();
1558 cout<<"\n LoadSectors: sorting "<<ncl<<" clusters"<<endl;
1561 for (Int_t ichamber=0;ichamber<5;ichamber++)
1562 for (Int_t isector=0;isector<18;isector++){
1563 fHoles[ichamber][isector]=kTRUE;
1568 // printf("\r %d left ",ncl);
1569 AliTRDcluster *c=(AliTRDcluster*)fClusters->UncheckedAt(ncl);
1570 Int_t detector=c->GetDetector();
1571 Int_t localTimeBin=c->GetLocalTimeBin();
1572 Int_t sector=fGeom->GetSector(detector);
1573 Int_t plane=fGeom->GetPlane(detector);
1575 Int_t trackingSector = CookSectorIndex(sector);
1576 if (c->GetLabel(0)>0){
1577 Int_t chamber = fGeom->GetChamber(detector);
1578 fHoles[chamber][trackingSector]=kFALSE;
1581 Int_t gtb = fTrSec[trackingSector]->CookTimeBinIndex(plane,localTimeBin);
1582 if(gtb < 0) continue;
1583 Int_t layer = fTrSec[trackingSector]->GetLayerNumber(gtb);
1586 fTrSec[trackingSector]->GetLayer(layer)->InsertCluster(c,index);
1592 for (Int_t isector=0;isector<18;isector++){
1593 for (Int_t ichamber=0;ichamber<5;ichamber++)
1594 if (fHoles[ichamber][isector]!=fGeom->IsHole(0,ichamber,17-isector))
1595 printf("Problem \t%d\t%d\t%d\t%d\n",isector,ichamber,fHoles[ichamber][isector],
1596 fGeom->IsHole(0,ichamber,17-isector));
1602 //_____________________________________________________________________________
1603 void AliTRDtracker::UnloadClusters()
1606 // Clears the arrays of clusters and tracks. Resets sectors and timebins
1611 nentr = fClusters->GetEntriesFast();
1612 for (i = 0; i < nentr; i++) delete fClusters->RemoveAt(i);
1615 nentr = fSeeds->GetEntriesFast();
1616 for (i = 0; i < nentr; i++) delete fSeeds->RemoveAt(i);
1618 nentr = fTracks->GetEntriesFast();
1619 for (i = 0; i < nentr; i++) delete fTracks->RemoveAt(i);
1621 Int_t nsec = AliTRDgeometry::kNsect;
1623 for (i = 0; i < nsec; i++) {
1624 for(Int_t pl = 0; pl < fTrSec[i]->GetNumberOfLayers(); pl++) {
1625 fTrSec[i]->GetLayer(pl)->Clear();
1631 //__________________________________________________________________________
1632 void AliTRDtracker::MakeSeeds(Int_t inner, Int_t outer, Int_t turn)
1634 // Creates track seeds using clusters in timeBins=i1,i2
1637 cerr<<"MakeSeeds: turn "<<turn<<" exceeds the limit of 2"<<endl;
1641 Double_t x[5], c[15];
1642 Int_t maxSec=AliTRDgeometry::kNsect;
1644 Double_t alpha=AliTRDgeometry::GetAlpha();
1645 Double_t shift=AliTRDgeometry::GetAlpha()/2.;
1646 Double_t cs=cos(alpha), sn=sin(alpha);
1647 Double_t cs2=cos(2.*alpha), sn2=sin(2.*alpha);
1650 Int_t i2 = fTrSec[0]->GetLayerNumber(inner);
1651 Int_t i1 = fTrSec[0]->GetLayerNumber(outer);
1653 Double_t x1 =fTrSec[0]->GetX(i1);
1654 Double_t xx2=fTrSec[0]->GetX(i2);
1656 for (Int_t ns=0; ns<maxSec; ns++) {
1658 Int_t nl2 = *(fTrSec[(ns-2+maxSec)%maxSec]->GetLayer(i2));
1659 Int_t nl=(*fTrSec[(ns-1+maxSec)%maxSec]->GetLayer(i2));
1660 Int_t nm=(*fTrSec[ns]->GetLayer(i2));
1661 Int_t nu=(*fTrSec[(ns+1)%maxSec]->GetLayer(i2));
1662 Int_t nu2=(*fTrSec[(ns+2)%maxSec]->GetLayer(i2));
1664 AliTRDpropagationLayer& r1=*(fTrSec[ns]->GetLayer(i1));
1666 for (Int_t is=0; is < r1; is++) {
1667 Double_t y1=r1[is]->GetY(), z1=r1[is]->GetZ();
1669 for (Int_t js=0; js < nl2+nl+nm+nu+nu2; js++) {
1671 const AliTRDcluster *cl;
1672 Double_t x2, y2, z2;
1673 Double_t x3=0., y3=0.;
1676 if(turn != 2) continue;
1677 AliTRDpropagationLayer& r2=*(fTrSec[(ns-2+maxSec)%maxSec]->GetLayer(i2));
1679 y2=cl->GetY(); z2=cl->GetZ();
1684 else if (js<nl2+nl) {
1685 if(turn != 1) continue;
1686 AliTRDpropagationLayer& r2=*(fTrSec[(ns-1+maxSec)%maxSec]->GetLayer(i2));
1688 y2=cl->GetY(); z2=cl->GetZ();
1693 else if (js<nl2+nl+nm) {
1694 if(turn != 1) continue;
1695 AliTRDpropagationLayer& r2=*(fTrSec[ns]->GetLayer(i2));
1697 x2=xx2; y2=cl->GetY(); z2=cl->GetZ();
1699 else if (js<nl2+nl+nm+nu) {
1700 if(turn != 1) continue;
1701 AliTRDpropagationLayer& r2=*(fTrSec[(ns+1)%maxSec]->GetLayer(i2));
1702 cl=r2[js-nl2-nl-nm];
1703 y2=cl->GetY(); z2=cl->GetZ();
1709 if(turn != 2) continue;
1710 AliTRDpropagationLayer& r2=*(fTrSec[(ns+2)%maxSec]->GetLayer(i2));
1711 cl=r2[js-nl2-nl-nm-nu];
1712 y2=cl->GetY(); z2=cl->GetZ();
1718 if(TMath::Abs(z1-z2) > fgkMaxSeedDeltaZ12) continue;
1720 Double_t zz=z1 - z1/x1*(x1-x2);
1722 if (TMath::Abs(zz-z2)>fgkMaxSeedDeltaZ) continue;
1724 Double_t d=(x2-x1)*(0.-y2)-(0.-x2)*(y2-y1);
1725 if (d==0.) {cerr<<"TRD MakeSeeds: Straight seed !\n"; continue;}
1729 x[4]=f1trd(x1,y1,x2,y2,x3,y3);
1731 if (TMath::Abs(x[4]) > fgkMaxSeedC) continue;
1733 x[2]=f2trd(x1,y1,x2,y2,x3,y3);
1735 if (TMath::Abs(x[4]*x1-x[2]) >= 0.99999) continue;
1737 x[3]=f3trd(x1,y1,x2,y2,z1,z2);
1739 if (TMath::Abs(x[3]) > fgkMaxSeedTan) continue;
1741 Double_t a=asin(x[2]);
1742 Double_t zv=z1 - x[3]/x[4]*(a+asin(x[4]*x1-x[2]));
1744 if (TMath::Abs(zv)>fgkMaxSeedVertexZ) continue;
1746 Double_t sy1=r1[is]->GetSigmaY2(), sz1=r1[is]->GetSigmaZ2();
1747 Double_t sy2=cl->GetSigmaY2(), sz2=cl->GetSigmaZ2();
1748 Double_t sy3=fgkSeedErrorSY3, sy=fgkSeedErrorSY, sz=fgkSeedErrorSZ;
1751 Double_t h01 = GetTiltFactor(r1[is]);
1752 Double_t xuFactor = 100.;
1758 sy1=sy1+sz1*h01*h01;
1759 Double_t syz=sz1*(-h01);
1760 // end of tilt changes
1762 Double_t f40=(f1trd(x1,y1+sy,x2,y2,x3,y3)-x[4])/sy;
1763 Double_t f42=(f1trd(x1,y1,x2,y2+sy,x3,y3)-x[4])/sy;
1764 Double_t f43=(f1trd(x1,y1,x2,y2,x3,y3+sy)-x[4])/sy;
1765 Double_t f20=(f2trd(x1,y1+sy,x2,y2,x3,y3)-x[2])/sy;
1766 Double_t f22=(f2trd(x1,y1,x2,y2+sy,x3,y3)-x[2])/sy;
1767 Double_t f23=(f2trd(x1,y1,x2,y2,x3,y3+sy)-x[2])/sy;
1768 Double_t f30=(f3trd(x1,y1+sy,x2,y2,z1,z2)-x[3])/sy;
1769 Double_t f31=(f3trd(x1,y1,x2,y2,z1+sz,z2)-x[3])/sz;
1770 Double_t f32=(f3trd(x1,y1,x2,y2+sy,z1,z2)-x[3])/sy;
1771 Double_t f34=(f3trd(x1,y1,x2,y2,z1,z2+sz)-x[3])/sz;
1775 // c[1]=0.; c[2]=sz1;
1776 c[1]=syz; c[2]=sz1*xuFactor;
1777 c[3]=f20*sy1; c[4]=0.; c[5]=f20*sy1*f20+f22*sy2*f22+f23*sy3*f23;
1778 c[6]=f30*sy1; c[7]=f31*sz1; c[8]=f30*sy1*f20+f32*sy2*f22;
1779 c[9]=f30*sy1*f30+f31*sz1*f31+f32*sy2*f32+f34*sz2*f34;
1780 c[10]=f40*sy1; c[11]=0.; c[12]=f40*sy1*f20+f42*sy2*f22+f43*sy3*f23;
1781 c[13]=f30*sy1*f40+f32*sy2*f42;
1782 c[14]=f40*sy1*f40+f42*sy2*f42+f43*sy3*f43;
1784 UInt_t index=r1.GetIndex(is);
1786 AliTRDtrack *track=new AliTRDtrack(r1[is],index,x,c,x1,ns*alpha+shift);
1788 Int_t rc=FollowProlongation(*track, i2);
1791 (track->GetNumberOfClusters() <
1792 (outer-inner)*fgkMinClustersInSeed)) delete track;
1794 fSeeds->AddLast(track); fNseeds++;
1795 // cerr<<"\r found seed "<<fNseeds;
1802 //_____________________________________________________________________________
1803 Int_t AliTRDtracker::ReadClusters(TObjArray *array, TTree *ClusterTree) const
1806 // Reads AliTRDclusters (option >= 0) or AliTRDrecPoints (option < 0)
1807 // from the file. The names of the cluster tree and branches
1808 // should match the ones used in AliTRDclusterizer::WriteClusters()
1810 TObjArray *clusterArray = new TObjArray(400);
1812 TBranch *branch=ClusterTree->GetBranch("TRDcluster");
1814 Error("ReadClusters","Can't get the branch !");
1817 branch->SetAddress(&clusterArray);
1819 Int_t nEntries = (Int_t) ClusterTree->GetEntries();
1820 // printf("found %d entries in %s.\n",nEntries,ClusterTree->GetName());
1822 // Loop through all entries in the tree
1824 AliTRDcluster *c = 0;
1827 for (Int_t iEntry = 0; iEntry < nEntries; iEntry++) {
1830 nbytes += ClusterTree->GetEvent(iEntry);
1832 // Get the number of points in the detector
1833 Int_t nCluster = clusterArray->GetEntriesFast();
1834 // printf("\r Read %d clusters from entry %d", nCluster, iEntry);
1836 // Loop through all TRD digits
1837 for (Int_t iCluster = 0; iCluster < nCluster; iCluster++) {
1838 c = (AliTRDcluster*)clusterArray->UncheckedAt(iCluster);
1839 AliTRDcluster *co = new AliTRDcluster(*c);
1840 co->SetSigmaY2(c->GetSigmaY2() * fSY2corr);
1841 Int_t ltb = co->GetLocalTimeBin();
1842 if(ltb == 19) co->SetSigmaZ2(c->GetSigmaZ2());
1843 else if(fNoTilt) co->SetSigmaZ2(c->GetSigmaZ2() * fSZ2corr);
1845 delete clusterArray->RemoveAt(iCluster);
1849 delete clusterArray;
1854 //__________________________________________________________________
1855 void AliTRDtracker::CookLabel(AliKalmanTrack* pt, Float_t wrong) const
1858 // This cooks a label. Mmmmh, smells good...
1861 Int_t label=123456789, index, i, j;
1862 Int_t ncl=pt->GetNumberOfClusters();
1863 const Int_t kRange = fTrSec[0]->GetOuterTimeBin()+1;
1867 // Int_t s[kRange][2];
1868 Int_t **s = new Int_t* [kRange];
1869 for (i=0; i<kRange; i++) {
1870 s[i] = new Int_t[2];
1872 for (i=0; i<kRange; i++) {
1878 for (i=0; i<ncl; i++) {
1879 index=pt->GetClusterIndex(i);
1880 AliTRDcluster *c=(AliTRDcluster*)fClusters->UncheckedAt(index);
1886 for (i=0; i<ncl; i++) {
1887 index=pt->GetClusterIndex(i);
1888 AliTRDcluster *c=(AliTRDcluster*)fClusters->UncheckedAt(index);
1889 for (Int_t k=0; k<3; k++) {
1890 label=c->GetLabel(k);
1891 labelAdded=kFALSE; j=0;
1893 while ( (!labelAdded) && ( j < kRange ) ) {
1894 if (s[j][0]==label || s[j][1]==0) {
1908 for (i=0; i<kRange; i++) {
1910 max=s[i][1]; label=s[i][0];
1914 for (i=0; i<kRange; i++) {
1920 if ((1.- Float_t(max)/ncl) > wrong) label=-label;
1922 pt->SetLabel(label);
1927 //__________________________________________________________________
1928 void AliTRDtracker::UseClusters(const AliKalmanTrack* t, Int_t from) const
1931 // Use clusters, but don't abuse them!
1934 Int_t ncl=t->GetNumberOfClusters();
1935 for (Int_t i=from; i<ncl; i++) {
1936 Int_t index = t->GetClusterIndex(i);
1937 AliTRDcluster *c=(AliTRDcluster*)fClusters->UncheckedAt(index);
1943 //_____________________________________________________________________
1944 Double_t AliTRDtracker::ExpectedSigmaY2(Double_t , Double_t , Double_t ) const
1946 // Parametrised "expected" error of the cluster reconstruction in Y
1948 Double_t s = 0.08 * 0.08;
1952 //_____________________________________________________________________
1953 Double_t AliTRDtracker::ExpectedSigmaZ2(Double_t , Double_t ) const
1955 // Parametrised "expected" error of the cluster reconstruction in Z
1957 Double_t s = 9 * 9 /12.;
1961 //_____________________________________________________________________
1962 Double_t AliTRDtracker::GetX(Int_t sector, Int_t plane, Int_t localTB) const
1965 // Returns radial position which corresponds to time bin <localTB>
1966 // in tracking sector <sector> and plane <plane>
1969 Int_t index = fTrSec[sector]->CookTimeBinIndex(plane, localTB);
1970 Int_t pl = fTrSec[sector]->GetLayerNumber(index);
1971 return fTrSec[sector]->GetLayer(pl)->GetX();
1976 //_______________________________________________________
1977 AliTRDtracker::AliTRDpropagationLayer::AliTRDpropagationLayer(Double_t x,
1978 Double_t dx, Double_t rho, Double_t radLength, Int_t tbIndex)
1981 // AliTRDpropagationLayer constructor
1984 fN = 0; fX = x; fdX = dx; fRho = rho; fX0 = radLength;
1985 fClusters = NULL; fIndex = NULL; fTimeBinIndex = tbIndex;
1988 for(Int_t i=0; i < (Int_t) kZones; i++) {
1989 fZc[i]=0; fZmax[i] = 0;
1994 if(fTimeBinIndex >= 0) {
1995 fClusters = new AliTRDcluster*[kMaxClusterPerTimeBin];
1996 fIndex = new UInt_t[kMaxClusterPerTimeBin];
1999 for (Int_t i=0;i<5;i++) fIsHole[i] = kFALSE;
2010 //_______________________________________________________
2011 void AliTRDtracker::AliTRDpropagationLayer::SetHole(
2012 Double_t Zmax, Double_t Ymax, Double_t rho,
2013 Double_t radLength, Double_t Yc, Double_t Zc)
2016 // Sets hole in the layer
2024 fHoleX0 = radLength;
2028 //_______________________________________________________
2029 AliTRDtracker::AliTRDtrackingSector::AliTRDtrackingSector(AliTRDgeometry* geo, Int_t gs, AliTRDparameter* par)
2032 // AliTRDtrackingSector Constructor
2041 // get holes description from geometry
2042 Bool_t holes[AliTRDgeometry::kNcham];
2043 //printf("sector\t%d\t",gs);
2044 for (Int_t icham=0; icham<AliTRDgeometry::kNcham;icham++){
2045 holes[icham] = fGeom->IsHole(0,icham,gs);
2046 //printf("%d",holes[icham]);
2050 for(UInt_t i=0; i < kMaxTimeBinIndex; i++) fTimeBinIndex[i] = -1;
2053 AliTRDpropagationLayer* ppl;
2055 Double_t x, xin, xout, dx, rho, radLength;
2058 // set time bins in the gas of the TPC
2060 xin = 246.055; xout = 254.055; steps = 20; dx = (xout-xin)/steps;
2061 rho = 0.9e-3; radLength = 28.94;
2063 for(Int_t i=0; i<steps; i++) {
2064 x = xin + i*dx + dx/2;
2065 ppl = new AliTRDpropagationLayer(x,dx,rho,radLength,-1);
2069 // set time bins in the outer field cage vessel
2071 dx = 50e-4; xin = xout; xout = xin + dx; rho = 1.71; radLength = 44.77; // Tedlar
2072 ppl = new AliTRDpropagationLayer(xin+dx/2,dx,rho,radLength,-1);
2075 dx = 0.02; xin = xout; xout = xin + dx; rho = 1.45; radLength = 44.86; // prepreg
2076 ppl = new AliTRDpropagationLayer(xin+dx/2,dx,rho,radLength,-1);
2079 dx = 2.; xin = xout; xout = xin + dx; rho = 1.45*0.02; radLength = 41.28; // Nomex
2080 steps = 5; dx = (xout - xin)/steps;
2081 for(Int_t i=0; i<steps; i++) {
2082 x = xin + i*dx + dx/2;
2083 ppl = new AliTRDpropagationLayer(x,dx,rho,radLength,-1);
2087 dx = 0.02; xin = xout; xout = xin + dx; rho = 1.45; radLength = 44.86; // prepreg
2088 ppl = new AliTRDpropagationLayer(xin+dx/2,dx,rho,radLength,-1);
2091 dx = 50e-4; xin = xout; xout = xin + dx; rho = 1.71; radLength = 44.77; // Tedlar
2092 ppl = new AliTRDpropagationLayer(xin+dx/2,dx,rho,radLength,-1);
2096 // set time bins in CO2
2098 xin = xout; xout = 275.0;
2099 steps = 50; dx = (xout - xin)/steps;
2100 rho = 1.977e-3; radLength = 36.2;
2102 for(Int_t i=0; i<steps; i++) {
2103 x = xin + i*dx + dx/2;
2104 ppl = new AliTRDpropagationLayer(x,dx,rho,radLength,-1);
2108 // set time bins in the outer containment vessel
2110 dx = 50e-4; xin = xout; xout = xin + dx; rho = 2.7; radLength = 24.01; // Al
2111 ppl = new AliTRDpropagationLayer(xin+dx/2,dx,rho,radLength,-1);
2114 dx = 50e-4; xin = xout; xout = xin + dx; rho = 1.71; radLength = 44.77; // Tedlar
2115 ppl = new AliTRDpropagationLayer(xin+dx/2,dx,rho,radLength,-1);
2118 dx = 0.06; xin = xout; xout = xin + dx; rho = 1.45; radLength = 44.86; // prepreg
2119 ppl = new AliTRDpropagationLayer(xin+dx/2,dx,rho,radLength,-1);
2122 dx = 3.; xin = xout; xout = xin + dx; rho = 1.45*0.02; radLength = 41.28; // Nomex
2123 steps = 10; dx = (xout - xin)/steps;
2124 for(Int_t i=0; i<steps; i++) {
2125 x = xin + i*dx + dx/2;
2126 ppl = new AliTRDpropagationLayer(x,dx,rho,radLength,-1);
2130 dx = 0.06; xin = xout; xout = xin + dx; rho = 1.45; radLength = 44.86; // prepreg
2131 ppl = new AliTRDpropagationLayer(xin+dx/2,dx,rho,radLength,-1);
2134 dx = 50e-4; xin = xout; xout = xin + dx; rho = 1.71; radLength = 44.77; // Tedlar
2135 ppl = new AliTRDpropagationLayer(xin+dx/2,dx,rho,radLength,-1);
2138 dx = 50e-4; xin = xout; xout = xin + dx; rho = 2.7; radLength = 24.01; // Al
2139 ppl = new AliTRDpropagationLayer(xin+dx/2,dx,rho,radLength,-1);
2142 Double_t xtrd = (Double_t) fGeom->Rmin();
2144 // add layers between TPC and TRD (Air temporarily)
2145 xin = xout; xout = xtrd;
2146 steps = 50; dx = (xout - xin)/steps;
2147 rho = 1.2e-3; radLength = 36.66;
2149 for(Int_t i=0; i<steps; i++) {
2150 x = xin + i*dx + dx/2;
2151 ppl = new AliTRDpropagationLayer(x,dx,rho,radLength,-1);
2156 // Double_t alpha=AliTRDgeometry::GetAlpha();
2158 // add layers for each of the planes
2160 Double_t dxRo = (Double_t) fGeom->CroHght(); // Rohacell
2161 Double_t dxSpace = (Double_t) fGeom->Cspace(); // Spacing between planes
2162 Double_t dxAmp = (Double_t) fGeom->CamHght(); // Amplification region
2163 Double_t dxDrift = (Double_t) fGeom->CdrHght(); // Drift region
2164 Double_t dxRad = (Double_t) fGeom->CraHght(); // Radiator
2165 Double_t dxTEC = dxRad + dxDrift + dxAmp + dxRo;
2166 Double_t dxPlane = dxTEC + dxSpace;
2169 const Int_t kNchambers = AliTRDgeometry::Ncham();
2172 Double_t ymaxsensitive=0;
2173 Double_t *zc = new Double_t[kNchambers];
2174 Double_t *zmax = new Double_t[kNchambers];
2175 Double_t *zmaxsensitive = new Double_t[kNchambers];
2176 // Double_t holeZmax = 1000.; // the whole sector is missing
2178 for(Int_t plane = 0; plane < AliTRDgeometry::Nplan(); plane++) {
2181 xin = xtrd + plane * dxPlane; xout = xin + dxRad;
2182 steps = 12; dx = (xout - xin)/steps; rho = 0.074; radLength = 40.6;
2183 for(Int_t i=0; i<steps; i++) {
2184 x = xin + i*dx + dx/2;
2185 ppl = new AliTRDpropagationLayer(x,dx,rho,radLength,-1);
2189 ymax = fGeom->GetChamberWidth(plane)/2.;
2190 ymaxsensitive = (fPar->GetColPadSize(plane)*fPar->GetColMax(plane)-4)/2.;
2192 for(Int_t ch = 0; ch < kNchambers; ch++) {
2193 zmax[ch] = fGeom->GetChamberLength(plane,ch)/2;
2194 Float_t pad = fPar->GetRowPadSize(plane,ch,0);
2195 Float_t row0 = fPar->GetRow0(plane,ch,0);
2196 Int_t nPads = fPar->GetRowMax(plane,ch,0);
2197 zmaxsensitive[ch] = Float_t(nPads)*pad/2.;
2198 // zc[ch] = (pad * nPads)/2 + row0 - pad/2;
2199 zc[ch] = (pad * nPads)/2 + row0;
2200 //zc[ch] = row0+zmax[ch]-AliTRDgeometry::RpadW();
2204 dx = fPar->GetTimeBinSize();
2205 rho = 0.00295 * 0.85; radLength = 11.0;
2207 Double_t x0 = (Double_t) fPar->GetTime0(plane);
2208 Double_t xbottom = x0 - dxDrift;
2209 Double_t xtop = x0 + dxAmp;
2211 // Amplification region
2212 steps = (Int_t) (dxAmp/dx);
2214 for(tb = 0; tb < steps; tb++) {
2215 x = x0 + tb * dx + dx/2;
2216 tbIndex = CookTimeBinIndex(plane, -tb-1);
2217 ppl = new AliTRDpropagationLayer(x,dx,rho,radLength,tbIndex);
2218 ppl->SetYmax(ymax,ymaxsensitive);
2219 ppl->SetZ(zc, zmax, zmaxsensitive);
2220 ppl->SetHoles(holes);
2223 tbIndex = CookTimeBinIndex(plane, -steps);
2224 x = (x + dx/2 + xtop)/2;
2226 ppl = new AliTRDpropagationLayer(x,dx,rho,radLength,tbIndex);
2227 ppl->SetYmax(ymax,ymaxsensitive);
2228 ppl->SetZ(zc, zmax,zmaxsensitive);
2229 ppl->SetHoles(holes);
2233 dx = fPar->GetTimeBinSize();
2234 steps = (Int_t) (dxDrift/dx);
2236 for(tb = 0; tb < steps; tb++) {
2237 x = x0 - tb * dx - dx/2;
2238 tbIndex = CookTimeBinIndex(plane, tb);
2240 ppl = new AliTRDpropagationLayer(x,dx,rho,radLength,tbIndex);
2241 ppl->SetYmax(ymax,ymaxsensitive);
2242 ppl->SetZ(zc, zmax, zmaxsensitive);
2243 ppl->SetHoles(holes);
2246 tbIndex = CookTimeBinIndex(plane, steps);
2247 x = (x - dx/2 + xbottom)/2;
2249 ppl = new AliTRDpropagationLayer(x,dx,rho,radLength,tbIndex);
2250 ppl->SetYmax(ymax,ymaxsensitive);
2251 ppl->SetZ(zc, zmax, zmaxsensitive);
2252 ppl->SetHoles(holes);
2256 xin = xtop; dx = 0.025; xout = xin + dx; rho = 1.7; radLength = 33.0;
2257 ppl = new AliTRDpropagationLayer(xin+dx/2,dx,rho,radLength,-1);
2258 ppl->SetYmax(ymax,ymaxsensitive);
2259 ppl->SetZ(zc, zmax,zmax);
2260 ppl->SetHoles(holes);
2264 xin = xout; xout = xtrd + (plane + 1) * dxPlane - dxSpace;
2265 steps = 5; dx = (xout - xin)/steps; rho = 0.074; radLength = 40.6;
2266 for(Int_t i=0; i<steps; i++) {
2267 x = xin + i*dx + dx/2;
2268 ppl = new AliTRDpropagationLayer(x,dx,rho,radLength,-1);
2269 ppl->SetYmax(ymax,ymaxsensitive);
2270 ppl->SetZ(zc, zmax,zmax);
2271 ppl->SetHoles(holes);
2275 // Space between the chambers, air
2276 xin = xout; xout = xtrd + (plane + 1) * dxPlane;
2277 steps = 5; dx = (xout - xin)/steps; rho = 1.29e-3; radLength = 36.66;
2278 for(Int_t i=0; i<steps; i++) {
2279 x = xin + i*dx + dx/2;
2280 ppl = new AliTRDpropagationLayer(x,dx,rho,radLength,-1);
2285 // Space between the TRD and RICH
2286 Double_t xRICH = 500.;
2287 xin = xout; xout = xRICH;
2288 steps = 200; dx = (xout - xin)/steps; rho = 1.29e-3; radLength = 36.66;
2289 for(Int_t i=0; i<steps; i++) {
2290 x = xin + i*dx + dx/2;
2291 ppl = new AliTRDpropagationLayer(x,dx,rho,radLength,-1);
2301 //______________________________________________________
2303 Int_t AliTRDtracker::AliTRDtrackingSector::CookTimeBinIndex(Int_t plane, Int_t localTB) const
2306 // depending on the digitization parameters calculates "global"
2307 // time bin index for timebin <localTB> in plane <plane>
2310 Double_t dxAmp = (Double_t) fGeom->CamHght(); // Amplification region
2311 Double_t dxDrift = (Double_t) fGeom->CdrHght(); // Drift region
2312 Double_t dx = (Double_t) fPar->GetTimeBinSize();
2314 Int_t tbAmp = fPar->GetTimeBefore();
2315 Int_t maxAmp = (Int_t) ((dxAmp+0.000001)/dx);
2316 if(kTRUE) maxAmp = 0; // intentional until we change parameter class
2317 Int_t tbDrift = fPar->GetTimeMax();
2318 Int_t maxDrift = (Int_t) ((dxDrift+0.000001)/dx);
2320 Int_t tbPerPlane = TMath::Min(tbAmp,maxAmp) + TMath::Min(tbDrift,maxDrift);
2322 Int_t gtb = (plane+1) * tbPerPlane - localTB - 1 - TMath::Min(tbAmp,maxAmp);
2325 (TMath::Abs(localTB) > TMath::Min(tbAmp,maxAmp))) return -1;
2326 if(localTB >= TMath::Min(tbDrift,maxDrift)) return -1;
2333 //______________________________________________________
2335 void AliTRDtracker::AliTRDtrackingSector::MapTimeBinLayers()
2338 // For all sensitive time bins sets corresponding layer index
2339 // in the array fTimeBins
2344 for(Int_t i = 0; i < fN; i++) {
2345 index = fLayers[i]->GetTimeBinIndex();
2347 // printf("gtb %d -> pl %d -> x %f \n", index, i, fLayers[i]->GetX());
2349 if(index < 0) continue;
2350 if(index >= (Int_t) kMaxTimeBinIndex) {
2351 printf("*** AliTRDtracker::MapTimeBinLayers: \n");
2352 printf(" index %d exceeds allowed maximum of %d!\n",
2353 index, kMaxTimeBinIndex-1);
2356 fTimeBinIndex[index] = i;
2359 Double_t x1, dx1, x2, dx2, gap;
2361 for(Int_t i = 0; i < fN-1; i++) {
2362 x1 = fLayers[i]->GetX();
2363 dx1 = fLayers[i]->GetdX();
2364 x2 = fLayers[i+1]->GetX();
2365 dx2 = fLayers[i+1]->GetdX();
2366 gap = (x2 - dx2/2) - (x1 + dx1/2);
2368 printf("*** warning: layers %d and %d are overlayed:\n",i,i+1);
2369 printf(" %f + %f + %f > %f\n", x1, dx1/2, dx2/2, x2);
2372 printf("*** warning: layers %d and %d have a large gap:\n",i,i+1);
2373 printf(" (%f - %f) - (%f + %f) = %f\n",
2374 x2, dx2/2, x1, dx1, gap);
2380 //______________________________________________________
2383 Int_t AliTRDtracker::AliTRDtrackingSector::GetLayerNumber(Double_t x) const
2386 // Returns the number of time bin which in radial position is closest to <x>
2389 if(x >= fLayers[fN-1]->GetX()) return fN-1;
2390 if(x <= fLayers[0]->GetX()) return 0;
2392 Int_t b=0, e=fN-1, m=(b+e)/2;
2393 for (; b<e; m=(b+e)/2) {
2394 if (x > fLayers[m]->GetX()) b=m+1;
2397 if(TMath::Abs(x - fLayers[m]->GetX()) >
2398 TMath::Abs(x - fLayers[m+1]->GetX())) return m+1;
2403 //______________________________________________________
2405 Int_t AliTRDtracker::AliTRDtrackingSector::GetInnerTimeBin() const
2408 // Returns number of the innermost SENSITIVE propagation layer
2411 return GetLayerNumber(0);
2414 //______________________________________________________
2416 Int_t AliTRDtracker::AliTRDtrackingSector::GetOuterTimeBin() const
2419 // Returns number of the outermost SENSITIVE time bin
2422 return GetLayerNumber(GetNumberOfTimeBins() - 1);
2425 //______________________________________________________
2427 Int_t AliTRDtracker::AliTRDtrackingSector::GetNumberOfTimeBins() const
2430 // Returns number of SENSITIVE time bins
2434 for(tb = kMaxTimeBinIndex-1; tb >=0; tb--) {
2435 layer = GetLayerNumber(tb);
2441 //______________________________________________________
2443 void AliTRDtracker::AliTRDtrackingSector::InsertLayer(AliTRDpropagationLayer* pl)
2446 // Insert layer <pl> in fLayers array.
2447 // Layers are sorted according to X coordinate.
2449 if ( fN == ((Int_t) kMaxLayersPerSector)) {
2450 printf("AliTRDtrackingSector::InsertLayer(): Too many layers !\n");
2453 if (fN==0) {fLayers[fN++] = pl; return;}
2454 Int_t i=Find(pl->GetX());
2456 memmove(fLayers+i+1 ,fLayers+i,(fN-i)*sizeof(AliTRDpropagationLayer*));
2457 fLayers[i]=pl; fN++;
2461 //______________________________________________________
2463 Int_t AliTRDtracker::AliTRDtrackingSector::Find(Double_t x) const
2466 // Returns index of the propagation layer nearest to X
2469 if (x <= fLayers[0]->GetX()) return 0;
2470 if (x > fLayers[fN-1]->GetX()) return fN;
2471 Int_t b=0, e=fN-1, m=(b+e)/2;
2472 for (; b<e; m=(b+e)/2) {
2473 if (x > fLayers[m]->GetX()) b=m+1;
2479 //______________________________________________________
2480 void AliTRDtracker::AliTRDpropagationLayer::SetZ(Double_t* center, Double_t *w, Double_t *wsensitive )
2483 // set centers and the width of sectors
2484 for (Int_t icham=0;icham< AliTRDgeometry::kNcham;icham++){
2485 fZc[icham] = center[icham];
2486 fZmax[icham] = w[icham];
2487 fZmaxSensitive[icham] = wsensitive[icham];
2488 // printf("chamber\t%d\tzc\t%f\tzmax\t%f\tzsens\t%f\n",icham,fZc[icham],fZmax[icham],fZmaxSensitive[icham]);
2491 //______________________________________________________
2493 void AliTRDtracker::AliTRDpropagationLayer::SetHoles(Bool_t *holes)
2496 // set centers and the width of sectors
2498 for (Int_t icham=0;icham< AliTRDgeometry::kNcham;icham++){
2499 fIsHole[icham] = holes[icham];
2500 if (holes[icham]) fHole = kTRUE;
2506 void AliTRDtracker::AliTRDpropagationLayer::GetPropagationParameters(
2507 Double_t y, Double_t z, Double_t &dx, Double_t &rho, Double_t &radLength,
2508 Bool_t &lookForCluster) const
2511 // Returns radial step <dx>, density <rho>, rad. length <radLength>,
2512 // and sensitivity <lookForCluster> in point <y,z>
2518 lookForCluster = kFALSE;
2520 // check dead regions in sensitive volume
2521 if(fTimeBinIndex >= 0) {
2524 for(Int_t ch = 0; ch < (Int_t) kZones; ch++) {
2525 if (TMath::Abs(z - fZc[ch]) < fZmaxSensitive[ch]){
2527 lookForCluster = !(fIsHole[zone]);
2528 if(TMath::Abs(y) > fYmaxSensitive){
2529 lookForCluster = kFALSE;
2531 if (fIsHole[zone]) {
2543 if (fHole==kFALSE) return;
2545 for(Int_t ch = 0; ch < (Int_t) kZones; ch++) {
2546 if (TMath::Abs(z - fZc[ch]) < fZmax[ch]){
2557 Int_t AliTRDtracker::AliTRDpropagationLayer::GetZone( Double_t z) const
2561 if (fTimeBinIndex < 0) return -20; //unknown
2562 Int_t zone=-10; // dead zone
2563 for(Int_t ch = 0; ch < (Int_t) kZones; ch++) {
2564 if(TMath::Abs(z - fZc[ch]) < fZmax[ch])
2571 //______________________________________________________
2573 void AliTRDtracker::AliTRDpropagationLayer::InsertCluster(AliTRDcluster* c,
2576 // Insert cluster in cluster array.
2577 // Clusters are sorted according to Y coordinate.
2579 if(fTimeBinIndex < 0) {
2580 printf("*** attempt to insert cluster into non-sensitive time bin!\n");
2584 if (fN== (Int_t) kMaxClusterPerTimeBin) {
2585 printf("AliTRDpropagationLayer::InsertCluster(): Too many clusters !\n");
2588 if (fN==0) {fIndex[0]=index; fClusters[fN++]=c; return;}
2589 Int_t i=Find(c->GetY());
2590 memmove(fClusters+i+1 ,fClusters+i,(fN-i)*sizeof(AliTRDcluster*));
2591 memmove(fIndex +i+1 ,fIndex +i,(fN-i)*sizeof(UInt_t));
2592 fIndex[i]=index; fClusters[i]=c; fN++;
2595 //______________________________________________________
2597 Int_t AliTRDtracker::AliTRDpropagationLayer::Find(Double_t y) const {
2599 // Returns index of the cluster nearest in Y
2601 if (y <= fClusters[0]->GetY()) return 0;
2602 if (y > fClusters[fN-1]->GetY()) return fN;
2603 Int_t b=0, e=fN-1, m=(b+e)/2;
2604 for (; b<e; m=(b+e)/2) {
2605 if (y > fClusters[m]->GetY()) b=m+1;
2611 //---------------------------------------------------------
2613 Double_t AliTRDtracker::GetTiltFactor(const AliTRDcluster* c) {
2615 // Returns correction factor for tilted pads geometry
2618 Double_t h01 = sin(TMath::Pi() / 180.0 * fPar->GetTiltingAngle());
2619 Int_t det = c->GetDetector();
2620 Int_t plane = fGeom->GetPlane(det);
2622 //if((plane == 1) || (plane == 3) || (plane == 5)) h01=-h01;
2623 if((plane == 0) || (plane == 2) || (plane == 4)) h01=-h01;
2625 if(fNoTilt) h01 = 0;
2631 void AliTRDtracker::CookdEdxTimBin(AliTRDtrack& TRDtrack)
2633 // *** ADDED TO GET MORE INFORMATION FOR TRD PID ---- PS
2634 // This is setting fdEdxPlane and fTimBinPlane
2635 // Sums up the charge in each plane for track TRDtrack and also get the
2636 // Time bin for Max. Cluster
2637 // Prashant Shukla (shukla@physi.uni-heidelberg.de)
2639 // const Int_t kNPlane = AliTRDgeometry::Nplan();
2640 // const Int_t kNPlane = 6;
2641 Double_t clscharge[kNPlane], maxclscharge[kNPlane];
2642 Int_t nCluster[kNPlane], timebin[kNPlane];
2644 //Initialization of cluster charge per plane.
2645 for (Int_t iPlane = 0; iPlane < kNPlane; iPlane++) {
2646 clscharge[iPlane] = 0.0;
2647 nCluster[iPlane] = 0;
2648 timebin[iPlane] = -1;
2649 maxclscharge[iPlane] = 0.0;
2652 // Loop through all clusters associated to track TRDtrack
2653 Int_t nClus = TRDtrack.GetNumberOfClusters(); // from Kalmantrack
2654 for (Int_t iClus = 0; iClus < nClus; iClus++) {
2655 Double_t charge = TRDtrack.GetClusterdQdl(iClus);
2656 Int_t index = TRDtrack.GetClusterIndex(iClus);
2657 AliTRDcluster *TRDcluster = (AliTRDcluster *) GetCluster(index);
2658 if (!TRDcluster) continue;
2659 Int_t tb = TRDcluster->GetLocalTimeBin();
2661 Int_t detector = TRDcluster->GetDetector();
2662 Int_t iPlane = fGeom->GetPlane(detector);
2663 clscharge[iPlane] = clscharge[iPlane]+charge;
2664 if(charge > maxclscharge[iPlane]) {
2665 maxclscharge[iPlane] = charge;
2666 timebin[iPlane] = tb;
2669 } // end of loop over cluster
2671 // Setting the fdEdxPlane and fTimBinPlane variabales
2672 Double_t Total_ch = 0;
2673 for (Int_t iPlane = 0; iPlane < kNPlane; iPlane++) {
2674 if (nCluster[iPlane]) clscharge[iPlane] /= nCluster[iPlane];
2675 TRDtrack.SetPIDsignals(clscharge[iPlane], iPlane);
2676 TRDtrack.SetPIDTimBin(timebin[iPlane], iPlane);
2677 Total_ch= Total_ch+clscharge[iPlane];
2680 // Int_t nc=TRDtrack.GetNumberOfClusters();
2682 // for (i=0; i<nc; i++) dedx += TRDtrack.GetClusterdQdl(i);
2684 // for (Int_t iPlane = 0; iPlane < kNPlane; iPlane++) {
2685 // TRDtrack.SetPIDsignals(dedx, iPlane);
2686 // TRDtrack.SetPIDTimBin(timbin[iPlane], iPlane);
2689 } // end of function