HMPID/AliHMPIDTracker.cxx

   1 #include "AliHMPIDTracker.h"     //class header
   2 #include "AliHMPIDCluster.h"     //GetTrackPoint(),PropagateBack()
   3 #include "AliHMPIDParam.h"       //GetTrackPoint(),PropagateBack()
   4 #include "AliHMPIDRecon.h"       //PropagateBack()
   5 #include <AliESD.h>              //PropagateBack()
   6 #include <AliRun.h>              //GetTrackPoint(),PropagateBack()
   7 #include <AliTrackPointArray.h>  //GetTrackPoint()
   8 #include <AliAlignObj.h>         //GetTrackPoint()
   9 #include <AliCDBManager.h>
  10 #include <AliCDBEntry.h>
  11
  12 ClassImp(AliHMPIDTracker)
  13
  14 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  15 Bool_t AliHMPIDTracker::GetTrackPoint(Int_t idx, AliTrackPoint& point) const
  16 {
  17 // Interface callback methode invoked from AliReconstruction::WriteAlignmentData() to get position of MIP cluster in MARS associated to a current track.
  18 // MIP cluster is reffered by index which is stored in AliESDtrack  ???????
  19 // Arguments: idx- cluster index which is stored by HMPID in AliESDtrack
  20 //            point- reference to the object where to store the point
  21 //   Returns: status of operation  if FALSE then AliReconstruction::WriteAlignmentData() do not store this point to array of points for current track.
  22   if(idx<0) return kFALSE; //no MIP cluster assigned to this track in PropagateBack()
  23   Int_t iCham=idx/1000000;
  24   Int_t iClu=idx%1000000;
  25   point.SetVolumeID(AliAlignObj::LayerToVolUID(AliAlignObj::kHMPID,iCham-1));//layer and chamber number
  26   AliHMPID *pRich=((AliHMPID*)gAlice->GetDetector("HMPID"));
  27   AliHMPIDCluster *pClu=(AliHMPIDCluster*)pRich->CluLst(iCham)->UncheckedAt(iClu);//get pointer to cluster
  28   Double_t mars[3];
  29   AliHMPIDParam::Instance()->Lors2Mars(iCham,pClu->X(),pClu->Y(),mars);
  30   point.SetXYZ(mars[0],mars[1],mars[2]);
  31   return kTRUE;
  32 }
  33 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  34 Int_t AliHMPIDTracker::LoadClusters(TTree *pCluTree)
  35 {
  36 // Interface callback methode invoked from AliReconstruction::RunTracking() to load HMPID clusters before PropagateBack() gets control
  37 // Arguments: pCluTree- pointer to clusters tree got by AliHMPIDLoader::LoadRecPoints("read") then AliHMPIDLoader::TreeR()
  38 //   Returns: error code (currently ignored in AliReconstruction::RunTraking())
  39   AliDebug(1,"Start.");  pCluTree->GetEntry(0);  AliDebug(1,"Stop."); return 0;
  40 }
  41 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  42 Int_t AliHMPIDTracker::PropagateBack(AliESD *pEsd)
  43 {
  44 // This method defined as pure virtual in AliTracker. It is invoked from AliReconstruction::RunTracking() after invocation of AliTracker::LoadClusters()
  45 // Agruments: pEsd - pointer to ESD
  46 //   Returns: error code
  47   AliCDBEntry *pNmeanEnt =AliCDBManager::Instance()->Get("HMPID/Calib/Nmean",pEsd->GetRunNumber()); //contains TObjArray of 21 TF1
  48   AliCDBEntry *pQthreEnt =AliCDBManager::Instance()->Get("HMPID/Calib/Qthre",pEsd->GetRunNumber()); //contains TObjArray of 7 TF1
  49   if(!pNmeanEnt) AliFatal("No Nmean C6F14 ");
  50   if(!pQthreEnt) AliFatal("No Qthre");
  51
  52   AliHMPID *pHmpid=((AliHMPID*)gAlice->GetDetector("HMPID"));
  53   return Recon(pEsd,pHmpid->CluLst(),(TObjArray*)pNmeanEnt->GetObject());
  54 }
  55 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  56 Int_t AliHMPIDTracker::Recon(AliESD *pEsd,TObjArray *pCluAll,TObjArray *pNmean)
  57 {
  58 // Interface callback methode invoked by AliRecontruction::RunTracking() during tracking after TOF. It's done just once per event
  59 // Arguments: pEsd - pointer to Event Summary Data class instance which contains a list of tracks
  60 //   Returns: error code, 0 if no errors
  61   Int_t iNtracks=pEsd->GetNumberOfTracks();  AliDebugClass(1,Form("Start with %i tracks",iNtracks));
  62
  63
  64   AliHMPIDRecon recon;                                                                       //instance of reconstruction class, nothing important in ctor
  65   Float_t xRa,yRa;
  66   for(Int_t iTrk=0;iTrk<iNtracks;iTrk++){                                                        //ESD tracks loop
  67     AliESDtrack *pTrk = pEsd->GetTrack(iTrk);                                                    //get next reconstructed track
  68     Int_t cham=IntTrkCha(pTrk,xRa,yRa);                                                          //get chamber intersected by thie track
  69     if(cham<0) continue;                                                                         //no intersection at all, go after next track
  70     Double_t nmean=((TF1*)pNmean->At(3*cham))->Eval(pEsd->GetTimeStamp());                       //C6F14 Nmean for this chamber
  71     recon.CkovAngle(pTrk,(TClonesArray *)pCluAll->At(cham),nmean);                               //search for Cerenkov angle for this track
  72   }                                                                                              //ESD tracks loop
  73   AliDebugClass(1,"Stop pattern recognition");
  74   return 0; // error code: 0=no error;
  75 }//PropagateBack()
  76 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  77 Int_t AliHMPIDTracker::IntTrkCha(AliESDtrack *pTrk,Float_t &xRa,Float_t &yRa)
  78 {
  79 // Static method to find intersection in between given track and HMPID chambers
  80 // Arguments: pTrk    - ESD track
  81 //            xRa,yRa - track intersection with the middle of radiator, LORS
  82 //   Returns: intersected chamber ID or -1
  83
  84   AliHMPIDParam *pParam=AliHMPIDParam::Instance();
  85   Float_t xPc=0,yPc=0,th=0,ph=0;                                                                //track intersection point and angles, LORS
  86   for(Int_t i=0;i<7;i++){                                                                       //chambers loop
  87     Double_t p1[3],n1[3]; pParam->Norm(i,n1); pParam->Lors2Mars(i,0,0,p1,AliHMPIDParam::kRad);  //point & norm  for RAD
  88     Double_t p2[3],n2[3]; pParam->Norm(i,n2); pParam->Lors2Mars(i,0,0,p2,AliHMPIDParam::kPc);   //point & norm  for PC
  89
  90     if(pTrk->Intersect(p1,n1,-GetBz())==kFALSE) continue;                                       //try to intersect track with the middle of radiator
  91     if(pTrk->Intersect(p2,n2,-GetBz())==kFALSE) continue;                                       //try to intersect track with PC
  92
  93     pParam->Mars2LorsVec(i,n1,th,ph);                                                           //track angles
  94     pParam->Mars2Lors   (i,p1,xRa,yRa);                                                         //TRKxRAD position
  95     pParam->Mars2Lors   (i,p2,xPc,yPc);                                                         //TRKxPC position
  96
  97     if(AliHMPIDDigit::IsInside(xPc,yPc)==kFALSE) continue;                                      //not in active area
  98     pTrk->SetHMPIDtrk      (xPc,yPc,th,ph);                                                     //store track intersection info
  99     pTrk->SetHMPIDcluIdx   (i,0);
 100     return i;
 101   }                                                                                             //chambers loop
 102   return -1; //no intersection with HMPID chambers
 103 }