AliEMCALv2.cxx

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 * Copyright(c) 1998-2004, ALICE Experiment at CERN, All rights reserved. *
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 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
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 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
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// --- Standard library ---
#include <cassert>

// --- ROOT system ---
#include <TBrowser.h>
#include <TClonesArray.h>
#include <TH2.h>
#include <TParticle.h>
#include <TROOT.h>
#include <TVirtualMC.h>

// --- AliRoot header files ---
#include "AliEMCALv2.h"
#include "AliEMCALHit.h"
#include "AliEMCALGeometry.h"
#include "AliRun.h"
#include "AliHeader.h"
#include "AliMC.h"
#include "AliStack.h"
#include "AliTrackReference.h"

ClassImp(AliEMCALv2) ;

//______________________________________________________________________
AliEMCALv2::AliEMCALv2() : AliEMCALv1()
{}

//______________________________________________________________________
AliEMCALv2::AliEMCALv2(const char *name, const char *title, 
                       const Bool_t checkGeoAndRun)
: AliEMCALv1(name,title,checkGeoAndRun)
{
  //fHits= new TClonesArray("AliEMCALHit",1000); //Already done in ctor of v1
  
  gAlice->GetMCApp()->AddHitList(fHits);
  
  fNhits    = 0;
  fIshunt   = 2; // All hits are associated with particles entering the calorimeter
  fTimeCut  = 30e-09;
  
  //fGeometry = GetGeometry(); 
  // pointer already initialized in AliEMCALv0 ctor, grandmother of this class
  // not sure why it was also invoked here, comment and leave the comment.
  
  AliInfo("Very good, V2 version is used!");
}

//______________________________________________________________________
AliEMCALv2::~AliEMCALv2()
{}

//______________________________________________________________________
void AliEMCALv2::AddHit(Int_t shunt, Int_t primary, Int_t tracknumber, 
                        Int_t iparent, Float_t ienergy, 
                        Int_t id, Float_t * hits,Float_t * p)
{
  static Int_t hitCounter;
  static AliEMCALHit *newHit, *curHit;
  static Bool_t deja ;
  
  deja = kFALSE;
  
  newHit = new AliEMCALHit(shunt, primary, tracknumber, iparent, ienergy, id, hits, p);
  
  for ( hitCounter = fNhits-1; hitCounter >= 0 && !deja; hitCounter-- ) 
  {
    curHit = (AliEMCALHit*) (*fHits)[hitCounter];
    
    // We add hits with the same tracknumber, while GEANT treats
    // primaries succesively
    if(curHit->GetPrimary() != primary) 
      break;
    
    if( *curHit == *newHit ) 
    {
      *curHit = *curHit + *newHit;
      deja = kTRUE;
      //            break; // 30-aug-04 by PAI 
    } // end if
  } // end for hitCounter
  
  if ( !deja ) 
  {
    new((*fHits)[fNhits]) AliEMCALHit(*newHit);
    fNhits++;
  }
  
  //    printf(" fNhits %i \n", fNhits); 
  delete newHit;
}

//______________________________________________________________________
void AliEMCALv2::StepManager(void)
{
  // position wrt MRS and energy deposited
  static Float_t        xyzte[5]={0.,0.,0.,0.,0.};// position wrt MRS, time and energy deposited
  static Float_t        pmom[4]={0.,0.,0.,0.};
  static TLorentzVector pos;  // Lorentz vector of the track current position.
  static TLorentzVector mom;  // Lorentz vector of the track current momentum.
  static Float_t ienergy = 0; // part->Energy();
  static TString curVolName="";
  static int supModuleNumber=-1, moduleNumber=-1, yNumber=-1, xNumber=-1, absid=-1;
  static int keyGeom=1;  //real TRD1 geometry
  static const char *vn = "SCMX"; // Apr 13, 2006 - only TRD1 case now
  static Float_t depositedEnergy=0.0; 
  
  if(keyGeom == 0) 
  {
    keyGeom = 2;
    if(fMC->VolId("PBMO")==0 || fMC->VolId("WSUC")==1) 
    {
      vn      = "SCMX";   // old TRD2(TRD1) or WSUC
      keyGeom = 1;
    } 
    
    printf("AliEMCALv2::StepManager():  keyGeom %i : Sensetive volume %s \n", 
           keyGeom, vn); 
    
    if(fMC->VolId("WSUC")==1) printf(" WSUC - cosmic ray stand geometry \n");
  }
  
  Int_t tracknumber =  gAlice->GetMCApp()->GetCurrentTrackNumber();
  Int_t parent=0;
  TParticle* part=0;
  
  curVolName = fMC->CurrentVolName();
  if(curVolName.Contains(vn) || curVolName.Contains("SCX")) 
  { // We are in a scintillator layer; SCX for 3X3
    
    if( ((depositedEnergy = fMC->Edep()) > 0.)  && (fMC->TrackTime() < fTimeCut))
    {// Track is inside a scintillator and deposits some energy
     //       Info("StepManager "," entry %i DE %f",++ientry, depositedEnergy); // for testing
      if (fCurPrimary==-1) 
        fCurPrimary=gAlice->GetMCApp()->GetPrimary(tracknumber);
      
      if (fCurParent==-1 || tracknumber != fCurTrack) 
      {
        // Check parentage
        parent=tracknumber;
        
        if (fCurParent != -1) 
        {
          while (parent != fCurParent && parent != -1) 
          {
            //TParticle *part=gAlice->GetMCApp()->Particle(parent);
            part=gAlice->GetMCApp()->Particle(parent);
            parent=part->GetFirstMother();
          }
        }
        
        if (fCurParent==-1 || parent==-1) 
        {
          //Int_t parent=tracknumber;
          //TParticle *part=gAlice->GetMCApp()->Particle(parent);
          parent=tracknumber;
          part=gAlice->GetMCApp()->Particle(parent);
          while (parent != -1 && fGeometry->IsInEMCALOrDCAL(part->Vx(),part->Vy(),part->Vz())) {
            parent=part->GetFirstMother();
            if (parent!=-1) 
              part=gAlice->GetMCApp()->Particle(parent);
          } 
          
          fCurParent=parent;
          if (fCurParent==-1)
            Error("StepManager","Cannot find parent");
          else 
          {
            //TParticle *part=gAlice->GetMCApp()->Particle(fCurParent);
            part=gAlice->GetMCApp()->Particle(fCurParent);
            ienergy = part->Energy(); 
            
            //Add reference to parent in TR tree.   
            AddTrackReference(tracknumber, AliTrackReference::kEMCAL);
            
          }
          while (parent != -1) 
          {
            part=gAlice->GetMCApp()->Particle(parent);
            part->SetBit(kKeepBit);
            parent=part->GetFirstMother();
          }
        }
        
        fCurTrack=tracknumber;
      } 
      
      fMC->TrackPosition(pos);
      xyzte[0] = pos[0];
      xyzte[1] = pos[1];
      xyzte[2] = pos[2];
      xyzte[3] = fMC->TrackTime() ;
      
      fMC->TrackMomentum(mom);
      pmom[0] = mom[0];
      pmom[1] = mom[1];
      pmom[2] = mom[2];
      pmom[3] = mom[3];
      
      //      if(ientry%200 > 0) return; // testing
      supModuleNumber = moduleNumber = yNumber = xNumber = absid = 0;
      if(keyGeom >= 1) 
      { // TRD1 case now
        fMC->CurrentVolOffID(4, supModuleNumber);
        fMC->CurrentVolOffID(3, moduleNumber);
        fMC->CurrentVolOffID(1, yNumber);
        fMC->CurrentVolOffID(0, xNumber); // really x number now
        
        Int_t CurrentSMType = 0;
        if     (strcmp(fMC->CurrentVolOffName(4),"SMOD")==0)  CurrentSMType = AliEMCALGeometry::kEMCAL_Standard ;
        else if(strcmp(fMC->CurrentVolOffName(4),"SM10")==0)  CurrentSMType = AliEMCALGeometry::kEMCAL_Half ;
        else if(strcmp(fMC->CurrentVolOffName(4),"SM3rd")==0) CurrentSMType = AliEMCALGeometry::kEMCAL_3rd  ;
        else if(strcmp(fMC->CurrentVolOffName(4),"DCSM")==0)  CurrentSMType = AliEMCALGeometry::kDCAL_Standard ;
        else if(strcmp(fMC->CurrentVolOffName(4),"DCEXT")==0) CurrentSMType = AliEMCALGeometry::kDCAL_Ext   ;
        else AliError("Unkown SM Type!!");
        
        Int_t preSM = 0;
        while( fGeometry->GetSMType(preSM) != CurrentSMType ) preSM++;
        supModuleNumber += preSM;
        
        // Nov 10,2006
        if(strcmp(fMC->CurrentVolOffName(0),vn) != 0) { // 3X3 case
          if     (strcmp(fMC->CurrentVolOffName(0),"SCX1")==0) xNumber=1;
          else if(strcmp(fMC->CurrentVolOffName(0),"SCX2")==0) xNumber=2;
          else if(strcmp(fMC->CurrentVolOffName(0),"SCX3")==0) xNumber=3;
          else Fatal("StepManager()", "Wrong name of sensitive volume in 3X3 case : %s ", fMC->CurrentVolOffName(0));
        }
      } 
      else 
      {
        fMC->CurrentVolOffID(5, supModuleNumber);
        fMC->CurrentVolOffID(4, moduleNumber);
        fMC->CurrentVolOffID(1, yNumber);
        fMC->CurrentVolOffID(0, xNumber);
        
        if     (strcmp(fMC->CurrentVolOffName(5),"SMOP")==0) supModuleNumber = 2*(supModuleNumber-1)+1;
        else if(strcmp(fMC->CurrentVolOffName(5),"SMON")==0) supModuleNumber = 2*(supModuleNumber-1)+2;
        else   assert(0); // something wrong
      }
      
      // Due to problem with index ordering conventions the calcultation of absid is no more like this: 
      // absid = fGeometry->GetAbsCellId(smNumber, moduleNumber-1, yNumber-1, xNumber-1);
      
      //
      // Swap A side in Phi and C side in Eta due to wrong indexing.
      //
      Int_t iphi = -1;
      Int_t ieta = -1;
      Int_t smNumber = supModuleNumber-1;
      Int_t smType   = 1;
      fGeometry->GetCellPhiEtaIndexInSModule(smNumber,moduleNumber-1,yNumber-1,xNumber-1, iphi, ieta);
      
      if (smNumber%2 == 0) 
      {
        if(strcmp(fMC->CurrentVolOffName(4),"DCSM")==0) smType = 3; //DCal supermodule. previous design/idea
        else smType = 2;
        ieta = ((fGeometry->GetCentersOfCellsEtaDir()).GetSize()* 2/smType -1)-ieta;// 47/31-ieta, revert the ordering on A side in order to keep convention.
      } 
      else 
      {  
        if(strcmp(fMC->CurrentVolOffName(4),"SM10")==0) smType = 2 ; //half supermodule. previous design/idea
        if(strcmp(fMC->CurrentVolOffName(4),"SM3rd")==0) smType = 3 ; //one third (installed in 2012) supermodule
        if(strcmp(fMC->CurrentVolOffName(4),"DCEXT")==0) smType = 3 ; //one third (installed in 2012) supermodule
        iphi= ((fGeometry->GetCentersOfCellsPhiDir()).GetSize()/smType-1)-iphi;// 23/7-iphi, revert the ordering on C side in order to keep convention.
      }
      
      // Once we know the indexes, calculate the absolute ID
      absid = fGeometry->GetAbsCellIdFromCellIndexes(smNumber, iphi, ieta);
      
      if (absid < 0) 
      {
        printf(" supModuleNumber %i : moduleNumber %i : yNumber %i : xNumber %i \n",
               supModuleNumber, moduleNumber, yNumber, xNumber); 
        Fatal("StepManager()", "Wrong id : %i ", absid) ; 
      }
      
      Float_t lightYield =  depositedEnergy ;
      // Apply Birk's law (copied from G3BIRK)
      
      if (fMC->TrackCharge()!=0) 
      { // Check
        Float_t birkC1Mod = 0;
        if (fBirkC0==1)
        { // Apply correction for higher charge states
          if (TMath::Abs(fMC->TrackCharge())>=2) birkC1Mod = fBirkC1*7.2/12.6;
          else                                   birkC1Mod = fBirkC1;
        }
        
        Float_t dedxcm=0.;
        if (fMC->TrackStep()>0)  dedxcm=1000.*fMC->Edep()/fMC->TrackStep();
        else                     dedxcm=0;
        lightYield=lightYield/(1.+birkC1Mod*dedxcm+fBirkC2*dedxcm*dedxcm);
      } 
      
      // use sampling fraction to get original energy --HG
      //      xyzte[4] = lightYield * fGeometry->GetSampling();
      xyzte[4] = lightYield; // 15-dec-04
      
      if (gDebug == -2) 
        printf("#sm %2i #m %3i #x %1i #z %1i -> absid %i : xyzte[4] = %f\n",
               supModuleNumber,moduleNumber,yNumber,xNumber,absid, xyzte[4]);
      
      AddHit(fIshunt, fCurPrimary,tracknumber, fCurParent, ienergy, absid,  xyzte, pmom);
    } // there is deposited energy
  }
}