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"       //Recon()
   5 #include <AliESD.h>              //PropagateBack(),Recon()
   6 #include <AliRun.h>              //GetTrackPoint(),PropagateBack()
   7 #include <AliTrackPointArray.h>  //GetTrackPoint()
   8 #include <AliAlignObj.h>         //GetTrackPoint()
   9 #include <AliCDBManager.h>       //PropageteBack()
  10 #include <AliCDBEntry.h>         //PropageteBack()
  11 //.
  12 // HMPID base class fo tracking
  13 //.
  14 //.
  15 //.
  16 ClassImp(AliHMPIDTracker)
  17 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  18 AliHMPIDTracker::AliHMPIDTracker():AliTracker()
  19 {
  20 // ctor. Create TObjArray of TClonesArray of AliHMPIDCluster
  21 //
  22 //
  23   fClu=new TObjArray(AliHMPIDDigit::kMaxCh+1);  fClu->SetOwner(kTRUE);
  24   for(int i=AliHMPIDDigit::kMinCh;i<=AliHMPIDDigit::kMaxCh;i++) fClu->AddAt(new TClonesArray("AliHMPIDCluster"),i);
  25 }//ctor
  26 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  27 Bool_t AliHMPIDTracker::GetTrackPoint(Int_t idx, AliTrackPoint& point) const
  28 {
  29 // Interface callback methode invoked from AliReconstruction::WriteAlignmentData() to get position of MIP cluster in MARS associated to a current track.
  30 // MIP cluster is reffered by index which is stored in AliESDtrack  ???????
  31 // Arguments: idx- cluster index which is stored by HMPID in AliESDtrack
  32 //            point- reference to the object where to store the point
  33 //   Returns: status of operation  if FALSE then AliReconstruction::WriteAlignmentData() do not store this point to array of points for current track.
  34   if(idx<0) return kFALSE; //no MIP cluster assigned to this track in PropagateBack()
  35   Int_t iCham=idx/1000000; Int_t iClu=idx%1000000;
  36   point.SetVolumeID(AliAlignObj::LayerToVolUID(AliAlignObj::kHMPID,iCham-1));//layer and chamber number
  37   TClonesArray *pArr=(TClonesArray*)(*fClu)[iCham];
  38   AliHMPIDCluster *pClu=(AliHMPIDCluster*)pArr->UncheckedAt(iClu);//get pointer to cluster
  39   Double_t mars[3];
  40   AliHMPIDParam::Instance()->Lors2Mars(iCham,pClu->X(),pClu->Y(),mars);
  41   point.SetXYZ(mars[0],mars[1],mars[2]);
  42   return kTRUE;
  43 }//GetTrackPoint()
  44 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  45 Int_t AliHMPIDTracker::IntTrkCha(AliESDtrack *pTrk,Float_t &xPc,Float_t &yPc)
  46 {
  47 // Static method to find intersection in between given track and HMPID chambers
  48 // Arguments: pTrk- ESD track; xPc,yPc- track intersection with PC in LORS [cm]
  49 //   Returns: intersected chamber ID or -1
  50   AliHMPIDParam *pParam=AliHMPIDParam::Instance();
  51   Float_t xRa=0,yRa=0,theta=0,phi=0;                                                            //track intersection at PC and angles at RAD, LORS
  52   for(Int_t i=AliHMPIDDigit::kMinCh;i<=AliHMPIDDigit::kMaxCh;i++){                              //chambers loop
  53     Double_t p1[3],n1[3]; pParam->Norm(i,n1); pParam->Point(i,p1,AliHMPIDParam::kRad);          //point & norm  for middle of radiator plane
  54     Double_t p2[3],n2[3]; pParam->Norm(i,n2); pParam->Point(i,p2,AliHMPIDParam::kPc);           //point & norm  for entrance to PC plane
  55     if(pTrk->Intersect(p1,n1,-GetBz())==kFALSE) continue;                                       //try to intersect track with the middle of radiator
  56     if(pTrk->Intersect(p2,n2,-GetBz())==kFALSE) continue;                                       //try to intersect track with PC
  57     pParam->Mars2LorsVec(i,n1,theta,phi);                                                       //track angles at RAD
  58     pParam->Mars2Lors   (i,p1,xRa,yRa);                                                         //TRKxRAD position
  59     pParam->Mars2Lors   (i,p2,xPc,yPc);                                                         //TRKxPC position
  60     if(AliHMPIDDigit::IsInside(xPc,yPc,pParam->DistCut())==kFALSE) continue;                    //not in active area
  61     pTrk->SetHMPIDtrk      (xRa,yRa,theta,phi);                                                 //store track intersection info
  62     pTrk->SetHMPIDcluIdx   (i,0);
  63     return i;
  64   }                                                                                             //chambers loop
  65   return -1; //no intersection with HMPID chambers
  66 }//IntTrkCha()
  67 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  68 Int_t AliHMPIDTracker::LoadClusters(TTree *pCluTree)
  69 {
  70 // Interface callback methode invoked from AliReconstruction::RunTracking() to load HMPID clusters before PropagateBack() gets control. Done once per event.
  71 // Arguments: pCluTree- pointer to clusters tree got by AliHMPIDLoader::LoadRecPoints("read") then AliHMPIDLoader::TreeR()
  72 //   Returns: error code (currently ignored in AliReconstruction::RunTraking())
  73   for(int i=AliHMPIDDigit::kMinCh;i<=AliHMPIDDigit::kMaxCh;i++) pCluTree->SetBranchAddress(Form("HMPID%d",i),&((*fClu)[i]));
  74   pCluTree->GetEntry(0);
  75   return 0;
  76 }//LoadClusters()
  77 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  78 Int_t AliHMPIDTracker::PropagateBack(AliESD *pEsd)
  79 {
  80 // Interface pure virtual in AliTracker. Invoked from AliReconstruction::RunTracking() after invocation of AliTracker::LoadClusters() once per event
  81 // Agruments: pEsd - pointer to ESD
  82 //   Returns: error code
  83   AliCDBEntry *pNmeanEnt =AliCDBManager::Instance()->Get("HMPID/Calib/Nmean"); //contains TObjArray of 21 TF1
  84   AliCDBEntry *pQthreEnt =AliCDBManager::Instance()->Get("HMPID/Calib/Qthre"); //contains TObjArray of 7 TF1
  85   if(!pNmeanEnt) AliFatal("No Nmean C6F14 ");
  86   if(!pQthreEnt) AliFatal("No Qthre");
  87
  88   return Recon(pEsd,fClu,(TObjArray*)pNmeanEnt->GetObject());
  89 }
  90 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  91 Int_t AliHMPIDTracker::Recon(AliESD *pEsd,TObjArray *pClus,TObjArray *pNmean)
  92 {
  93 // Static method to reconstruct Theta Ckov for all valid tracks of a given event.
  94 // Arguments: pEsd- pointer ESD; pClu- pointer to clusters for all chambers; pNmean - pointer to all function Nmean=f(time)
  95 //   Returns: error code, 0 if no errors
  96   AliHMPIDRecon recon;                                                                       //instance of reconstruction class, nothing important in ctor
  97   Float_t xPc,yPc;
  98   for(Int_t iTrk=0;iTrk<pEsd->GetNumberOfTracks();iTrk++){                                       //ESD tracks loop
  99     AliESDtrack *pTrk = pEsd->GetTrack(iTrk);                                                    //get reconstructed track
 100     Int_t cham=IntTrkCha(pTrk,xPc,yPc);                                                          //get chamber intersected by this track
 101     if(cham<0) continue;                                                                         //no intersection at all, go after next track
 102     Double_t nmean=((TF1*)pNmean->At(3*cham))->Eval(pEsd->GetTimeStamp());                       //C6F14 Nmean for this chamber
 103     recon.SetImpPC(xPc,yPc);                                                                     //store track impact to PC
 104     recon.CkovAngle(pTrk,(TClonesArray *)pClus->At(cham),nmean);                                 //search for Cerenkov angle of this track
 105   }                                                                                              //ESD tracks loop
 106   return 0; // error code: 0=no error;
 107 }//PropagateBack()
 108 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++