[u/mrichter/AliRoot.git] / PHOS / AliPHOSGeometry.cxx

/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * 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.                  *
 **************************************************************************/

//_________________________________________________________________________
// Geometry class for PHOS version SUBATECH
//*-- Author : Y. Schutz SUBATECH 
//////////////////////////////////////////////////////////////////////////////

// --- ROOT system ---

#include "TVector3.h"
#include "TRotation.h" 

// --- Standard library ---

#include <iostream>
#include <cassert>

// --- AliRoot header files ---

#include "AliPHOSGeometry.h"
#include "AliPHOSPpsdRecPoint.h"
#include "AliConst.h"

ClassImp(AliPHOSGeometry)

  AliPHOSGeometry * AliPHOSGeometry::fGeom = 0 ;

//____________________________________________________________________________
AliPHOSGeometry::~AliPHOSGeometry(void)
{
  fRotMatrixArray->Delete() ; 
  delete fRotMatrixArray ; 
}

//____________________________________________________________________________
Bool_t AliPHOSGeometry::AbsToRelNumbering(const Int_t AbsId, Int_t * RelId)
{
  // RelId[0] = PHOS Module number 1:fNModules 
  // RelId[1] = 0 if PbW04
  //          = PPSD Module number 1:fNumberOfModulesPhi*fNumberOfModulesZ*2 (2->up and bottom level)
  // RelId[2] = Row number inside a PHOS or PPSD module
  // RelId[3] = Column number inside a PHOS or PPSD module

  Bool_t rv  = kTRUE ; 
  Float_t Id = AbsId ;

  Int_t PHOSModuleNumber = (Int_t)TMath:: Ceil( Id / ( GetNPhi() * GetNZ() ) ) ; 
  
  if ( PHOSModuleNumber >  GetNModules() ) { // its a PPSD pad

    Id -=  GetNPhi() * GetNZ() *  GetNModules() ; 
    Float_t tempo = 2 *  GetNumberOfModulesPhi() * GetNumberOfModulesZ() *  GetNumberOfPadsPhi() * GetNumberOfPadsZ() ; 
    RelId[0] = (Int_t)TMath::Ceil( Id / tempo ) ; 
    Id -= ( RelId[0] - 1 ) * tempo ;
    RelId[1] = (Int_t)TMath::Ceil( Id / ( GetNumberOfPadsPhi() * GetNumberOfPadsZ() ) ) ; 
    Id -= ( RelId[1] - 1 ) * GetNumberOfPadsPhi() * GetNumberOfPadsZ() ;
    RelId[2] = (Int_t)TMath::Ceil( Id / GetNumberOfPadsPhi() ) ;
    RelId[3] = (Int_t) ( Id - ( RelId[2] - 1 )  * GetNumberOfPadsPhi() ) ; 
  } 
  else { // its a PW04 crystal

    RelId[0] = PHOSModuleNumber ;
    RelId[1] = 0 ;
    Id -= ( PHOSModuleNumber - 1 ) *  GetNPhi() * GetNZ() ; 
    RelId[2] = (Int_t)TMath::Ceil( Id / GetNPhi() ) ;
    RelId[3] = (Int_t)( Id - ( RelId[2] - 1 ) * GetNPhi() ) ; 
  } 
  return rv ; 
}
//____________________________________________________________________________  
void AliPHOSGeometry::EmcModuleCoverage(const Int_t mod, Double_t & tm, Double_t & tM, Double_t & pm, Double_t & pM, Option_t * opt) 
{
  // calculates the angular coverage in theta and phi of a EMC module

 Double_t conv ; 
  if ( opt == kRadian ) 
    conv = 1. ; 
  else if ( opt == kDegre )
    conv = 180. / TMath::Pi() ; 
  else {
    cout << "<I>  AliPHOSGeometry::EmcXtalCoverage : " << opt << " unknown option; result in radian " << endl ; 
    conv = 1. ;
      }

  Float_t phi =  GetPHOSAngle(mod) *  (TMath::Pi() / 180.)  ;  
  Float_t Y0  =  GetIPtoOuterCoverDistance() + GetUpperPlateThickness()
		  + GetSecondUpperPlateThickness() + GetUpperCoolingPlateThickness()  ;  
  
  Double_t angle = TMath::ATan( GetCrystalSize(0)*GetNPhi() / (2 * Y0) ) ;
  phi = phi + 1.5 * TMath::Pi() ; // to follow the convention of the particle generator(PHOS is between 230 and 310 deg.)
  Double_t m  = phi - angle ;
  Double_t M  = phi + angle ;
  pM = TMath::Max(M, m) * conv ;
  pm = TMath::Min(M, m) * conv ; 
  
  angle =  TMath::ATan( GetCrystalSize(2)*GetNZ() / (2 * Y0) ) ;
  M  = TMath::Pi() / 2.  + angle ; // to follow the convention of the particle generator(PHOS is at 90 deg.)
  m  = TMath::Pi() / 2.  - angle ;
  tM = TMath::Max(M, m) * conv ;
  tm = TMath::Min(M, m) * conv ; 
 
}

//____________________________________________________________________________  
void AliPHOSGeometry::EmcXtalCoverage(Double_t & theta, Double_t & phi, Option_t * opt) 
{
  // calculates the angular coverage in theta and phi of a single crystal in a EMC module

  Double_t conv ; 
  if ( opt == kRadian ) 
    conv = 1. ; 
  else if ( opt == kDegre )
    conv = 180. / TMath::Pi() ; 
  else {
    cout << "<I>  AliPHOSGeometry::EmcXtalCoverage : " << opt << " unknown option; result in radian " << endl ; 
    conv = 1. ;
      }

  Float_t Y0   =  GetIPtoOuterCoverDistance() + GetUpperPlateThickness()
    + GetSecondUpperPlateThickness() + GetUpperCoolingPlateThickness()  ;  
  theta = 2 * TMath::ATan( GetCrystalSize(2) / (2 * Y0) ) * conv ;
  phi   = 2 * TMath::ATan( GetCrystalSize(0) / (2 * Y0) ) * conv ;
}
 

//____________________________________________________________________________
void AliPHOSGeometry::ImpactOnEmc(const Double_t theta, const Double_t phi, Int_t & ModuleNumber, Double_t & z, Double_t & x) 
{
  // calculates the impact coordinates of a neutral particle  
  // emitted in direction theta and phi in ALICE

  // searches for the PHOS EMC module
  ModuleNumber = 0 ; 
  Double_t tm, tM, pm, pM ; 
  Int_t index = 1 ; 
  while ( ModuleNumber == 0 && index <= GetNModules() ) { 
    EmcModuleCoverage(index, tm, tM, pm, pM) ; 
    if ( (theta >= tm && theta <= tM) && (phi >= pm && phi <= pM ) ) 
      ModuleNumber = index ; 
    index++ ;    
  }
  if ( ModuleNumber != 0 ) {
    Float_t phi0 =  GetPHOSAngle(ModuleNumber) *  (TMath::Pi() / 180.) + 1.5 * TMath::Pi()  ;  
    Float_t Y0  =  GetIPtoOuterCoverDistance() + GetUpperPlateThickness()
      + GetSecondUpperPlateThickness() + GetUpperCoolingPlateThickness()  ;   
    Double_t angle = phi - phi0; 
    x = Y0 * TMath::Tan(angle) ; 
    angle = theta - TMath::Pi() / 2 ; 
    z = Y0 * TMath::Tan(angle) ; 
  }
}

//____________________________________________________________________________
void AliPHOSGeometry::GetGlobal(const AliRecPoint* RecPoint, TVector3 & gpos, TMatrix & gmat)
{

  AliPHOSRecPoint * tmpPHOS = (AliPHOSRecPoint *) RecPoint ;  
  TVector3 LocalPosition ;

  tmpPHOS->GetLocalPosition(gpos) ;


  if ( tmpPHOS->IsEmc() ) // it is a EMC crystal 
    {  gpos.SetY( -(GetIPtoOuterCoverDistance() + GetUpperPlateThickness() +
		    GetSecondUpperPlateThickness() + GetUpperCoolingPlateThickness()) ) ;  

    }
  else
    { // it is a PPSD pad
      AliPHOSPpsdRecPoint * tmpPpsd = (AliPHOSPpsdRecPoint *) RecPoint ;
      if (tmpPpsd->GetUp() ) // it is an upper module
	{
	  gpos.SetY(-( GetIPtoOuterCoverDistance() - GetMicromegas2Thickness() - 
		       GetLeadToMicro2Gap() - GetLeadConverterThickness() -  
		       GetMicro1ToLeadGap() - GetMicromegas1Thickness() / 2.0 )  ) ; 
	} 
      else // it is a lower module
	gpos.SetY(-( GetIPtoOuterCoverDistance() - GetMicromegas2Thickness() / 2.0) ) ; 
    }  

  Float_t Phi           = GetPHOSAngle( tmpPHOS->GetPHOSMod()) ; 
  Double_t const RADDEG = 180.0 / kPI ;
  Float_t rPhi          = Phi / RADDEG ; 
  
  TRotation Rot ;
  Rot.RotateZ(-rPhi) ; // a rotation around Z by angle  
  
  TRotation dummy = Rot.Invert() ;  // to transform from original frame to rotate frame
  gpos.Transform(Rot) ; // rotate the baby 

}

//____________________________________________________________________________
void AliPHOSGeometry::GetGlobal(const AliRecPoint* RecPoint, TVector3 & gpos)
{
  AliPHOSRecPoint * tmpPHOS = (AliPHOSRecPoint *) RecPoint ;  
  TVector3 LocalPosition ;
  tmpPHOS->GetLocalPosition(gpos) ;


  if ( tmpPHOS->IsEmc() ) // it is a EMC crystal 
    {  gpos.SetY( -(GetIPtoOuterCoverDistance() + GetUpperPlateThickness() +
		    GetSecondUpperPlateThickness() + GetUpperCoolingPlateThickness()) ) ;  
    }
  else
    { // it is a PPSD pad
      AliPHOSPpsdRecPoint * tmpPpsd = (AliPHOSPpsdRecPoint *) RecPoint ;
      if (tmpPpsd->GetUp() ) // it is an upper module
	{
	  gpos.SetY(-( GetIPtoOuterCoverDistance() - GetMicromegas2Thickness() - 
		       GetLeadToMicro2Gap() - GetLeadConverterThickness() -  
		       GetMicro1ToLeadGap() - GetMicromegas1Thickness() / 2.0 )  ) ; 
	} 
      else // it is a lower module
	gpos.SetY(-( GetIPtoOuterCoverDistance() - GetMicromegas2Thickness() / 2.0) ) ; 
    }  

  Float_t Phi           = GetPHOSAngle( tmpPHOS->GetPHOSMod()) ; 
  Double_t const RADDEG = 180.0 / kPI ;
  Float_t rPhi          = Phi / RADDEG ; 
  
  TRotation Rot ;
  Rot.RotateZ(-rPhi) ; // a rotation around Z by angle  
  
  TRotation dummy = Rot.Invert() ;  // to transform from original frame to rotate frame
  gpos.Transform(Rot) ; // rotate the baby 
}

//____________________________________________________________________________
void AliPHOSGeometry::Init(void)
{
  fRotMatrixArray = new TObjArray(fNModules) ; 

  cout << "PHOS geometry setup: parameters for option " << fName << " " << fTitle << endl ;
  if ( ((strcmp( fName, "default" )) == 0)  || ((strcmp( fName, "GPS2" )) == 0) ) {
    fInit     = kTRUE ; 
    this->InitPHOS() ; 
    this->InitPPSD() ;
    this->SetPHOSAngles() ; 
  }
 else {
   fInit = kFALSE ; 
   cout << "PHOS Geometry setup: option not defined " << fName << endl ; 
 }
}

//____________________________________________________________________________
void AliPHOSGeometry::InitPHOS(void)
{
     // PHOS 

  fNPhi     = 64 ; 
  fNZ       = 64 ; 
  fNModules =  5 ; 
  
  fPHOSAngle[0] = 0.0 ; // Module position angles are set in CreateGeometry()
  fPHOSAngle[1] = 0.0 ;
  fPHOSAngle[2] = 0.0 ;
  fPHOSAngle[3] = 0.0 ;
 
  fXtlSize[0] =  2.2 ;
  fXtlSize[1] = 18.0 ;
  fXtlSize[2] =  2.2 ;

  // all these numbers coming next are subject to changes

  fOuterBoxThickness[0] = 2.8 ;
  fOuterBoxThickness[1] = 5.0 ;      
  fOuterBoxThickness[2] = 5.0 ;
  
  fUpperPlateThickness  = 4.0 ;
  
  fSecondUpperPlateThickness = 5.0 ; 
  
  fCrystalSupportHeight   = 6.95 ; 
  fCrystalWrapThickness   = 0.01 ;
  fCrystalHolderThickness = 0.005 ;
  fModuleBoxThickness     = 2.0 ; 
  fIPtoOuterCoverDistance = 447.0 ;      
  fIPtoCrystalSurface     = 460.0 ;  
  
  fPinDiodeSize[0] = 1.0 ;    
  fPinDiodeSize[1] = 0.1 ;    
  fPinDiodeSize[2] = 1.0 ;    
  
  fUpperCoolingPlateThickness   = 0.06 ; 
  fSupportPlateThickness        = 10.0 ;
  fLowerThermoPlateThickness    =  3.0 ; 
  fLowerTextolitPlateThickness  =  1.0 ;
  fGapBetweenCrystals           = 0.03 ;
  
  fTextolitBoxThickness[0] = 1.5 ;  
  fTextolitBoxThickness[1] = 0.0 ;   
  fTextolitBoxThickness[2] = 3.0 ; 
  
  fAirThickness[0] =  1.56   ;
  fAirThickness[1] = 20.5175 ;  
  fAirThickness[2] =  2.48   ;  
  
  Float_t XtalModulePhiSize =  fNPhi * ( fXtlSize[0] + 2 * fGapBetweenCrystals ) ; 
  Float_t XtalModuleZSize   =  fNZ * ( fXtlSize[2] + 2 * fGapBetweenCrystals ) ;
  
  // The next dimensions are calculated from the above parameters
  
  fOuterBoxSize[0] =  XtalModulePhiSize + 2 * ( fAirThickness[0] + fModuleBoxThickness
						+ fTextolitBoxThickness[0] + fOuterBoxThickness[0] ) ; 
  fOuterBoxSize[1] = ( fXtlSize[1] + fCrystalSupportHeight + fCrystalWrapThickness + fCrystalHolderThickness )
    + 2 * (fAirThickness[1] +  fModuleBoxThickness + fTextolitBoxThickness[1] + fOuterBoxThickness[1] ) ;
  fOuterBoxSize[2] =  XtalModuleZSize +  2 * ( fAirThickness[2] + fModuleBoxThickness 
					       + fTextolitBoxThickness[2] + fOuterBoxThickness[2] ) ; 
  
  fTextolitBoxSize[0]  = fOuterBoxSize[0] - 2 * fOuterBoxThickness[0] ;
  fTextolitBoxSize[1]  = fOuterBoxSize[1] -  fOuterBoxThickness[1] - fUpperPlateThickness ;
  fTextolitBoxSize[2]  = fOuterBoxSize[2] - 2 * fOuterBoxThickness[2] ;
  
  fAirFilledBoxSize[0] =  fTextolitBoxSize[0] - 2 * fTextolitBoxThickness[0] ; 
  fAirFilledBoxSize[1] =  fTextolitBoxSize[1] - fSecondUpperPlateThickness ; 
  fAirFilledBoxSize[2] =  fTextolitBoxSize[2] - 2 * fTextolitBoxThickness[2] ; 
  
}

//____________________________________________________________________________
void AliPHOSGeometry::InitPPSD(void)
{
    // PPSD
    
  fAnodeThickness           = 0.0009 ; 
  fAvalancheGap             = 0.01 ; 
  fCathodeThickness         = 0.0009 ;
  fCompositeThickness       = 0.3 ; 
  fConversionGap            = 0.6 ; 
  fLeadConverterThickness   = 0.56 ; 
  fLeadToMicro2Gap          = 0.1 ; 
  fLidThickness             = 0.2 ; 
  fMicro1ToLeadGap          = 0.1 ; 
  fMicromegasWallThickness  = 0.6 ; 
  fNumberOfModulesPhi       = 4 ; 
  fNumberOfModulesZ         = 4 ; 
  fNumberOfPadsPhi          = 24 ; 
  fNumberOfPadsZ            = 24 ;   
  fPCThickness              = 0.1 ; 
  fPhiDisplacement          = 0.8 ;  
  fZDisplacement            = 0.8 ;  

  fMicromegas1Thickness   = fLidThickness + 2 * fCompositeThickness + fCathodeThickness + fPCThickness 
                              + fAnodeThickness + fConversionGap + fAvalancheGap ; 
  fMicromegas2Thickness   = fMicromegas1Thickness ; 


  fPPSDModuleSize[0] = 38.0 ; 
  fPPSDModuleSize[1] = fMicromegas1Thickness ; 
  fPPSDModuleSize[2] = 38.0 ; 
 
  fPPSDBoxSize[0] = fNumberOfModulesPhi * fPPSDModuleSize[0] + 2 * fPhiDisplacement ;  
  fPPSDBoxSize[1] = fMicromegas2Thickness + fMicromegas2Thickness + fLeadConverterThickness + fMicro1ToLeadGap + fLeadToMicro2Gap ;    
  fPPSDBoxSize[2] = fNumberOfModulesZ *  fPPSDModuleSize[2] + 2 * fZDisplacement ;

  fIPtoTopLidDistance     = fIPtoOuterCoverDistance -  fPPSDBoxSize[1] - 1. ;  
  
}

//____________________________________________________________________________
AliPHOSGeometry *  AliPHOSGeometry::GetInstance() 
{ 
  return (AliPHOSGeometry *) fGeom ; 
}

//____________________________________________________________________________
AliPHOSGeometry *  AliPHOSGeometry::GetInstance(const Text_t* name, const Text_t* title) 
{
  AliPHOSGeometry * rv = 0  ; 
  if ( fGeom == 0 ) {
    fGeom = new AliPHOSGeometry(name, title) ; 
    rv = (AliPHOSGeometry * ) fGeom ; 
  }
  else {
    if ( strcmp(fGeom->GetName(), name) != 0 ) {
      cout << "AliPHOSGeometry <E> : current geometry is " << fGeom->GetName() << endl
	   << "                      you cannot call     " << name << endl ; 
    }
    else
      rv = (AliPHOSGeometry *) fGeom ; 
  } 
  return rv ; 
}

//____________________________________________________________________________
Bool_t AliPHOSGeometry::RelToAbsNumbering(const Int_t * RelId, Int_t &  AbsId)
{

  // AbsId = 1:fNModules * fNPhi * fNZ  -> PbWO4
  // AbsId = 1:fNModules * 2 * (fNumberOfModulesPhi * fNumberOfModulesZ) * fNumberOfPadsPhi * fNumberOfPadsZ -> PPSD

  Bool_t rv = kTRUE ; 
 
  if ( RelId[1] > 0 ) { // its a PPSD pad

    AbsId =    GetNPhi() * GetNZ() *  GetNModules()                          // the offset to separate emcal crystals from PPSD pads
      + ( RelId[0] - 1 ) * GetNumberOfModulesPhi() * GetNumberOfModulesZ()   // the pads offset of PHOS modules 
                         * GetNumberOfPadsPhi() * GetNumberOfPadsZ() * 2
      + ( RelId[1] - 1 ) * GetNumberOfPadsPhi() * GetNumberOfPadsZ()         // the pads offset of PPSD modules 
      + ( RelId[2] - 1 ) * GetNumberOfPadsPhi()                              // the pads offset of a PPSD row
      + RelId[3] ;                                                           // the column number
  } 
  else {
    if ( RelId[1] == 0 ) { // its a Phos crystal
      AbsId =  ( RelId[0] - 1 ) *  GetNPhi() * GetNZ() // the offset of PHOS modules
        + ( RelId[2] - 1 ) * GetNPhi()                 // the offset of a xtal row
        + RelId[3] ;                                   // the column number
    }
  }

  return rv ; 
}

//____________________________________________________________________________

void AliPHOSGeometry::RelPosInAlice(const Int_t Id, TVector3 & pos ) 
{
   if (Id > 0) { 

  Int_t RelId[4] ;
 
  AbsToRelNumbering(Id , RelId) ;

  Int_t PHOSModule = RelId[0] ; 

  Float_t Y0 ; 

  if ( RelId[1] == 0 ) // it is a PbW04 crystal 
  {  Y0 =  -(GetIPtoOuterCoverDistance() + GetUpperPlateThickness()
      + GetSecondUpperPlateThickness() + GetUpperCoolingPlateThickness())  ;  
  }
  if ( RelId[1] > 0 ) { // its a PPSD pad
    if ( RelId[1] >  GetNumberOfModulesPhi() *  GetNumberOfModulesZ() ) // its an bottom module
     {
       Y0 = -( GetIPtoOuterCoverDistance() - GetMicromegas2Thickness() / 2.0)  ;
     } 
    else // its an upper module
      Y0 = -( GetIPtoOuterCoverDistance() - GetMicromegas2Thickness() - GetLeadToMicro2Gap()
	-  GetLeadConverterThickness() -  GetMicro1ToLeadGap() - GetMicromegas1Thickness() / 2.0) ; 
  }

  Float_t x, z ; 
  RelPosInModule(RelId, x, z) ; 

  pos.SetX(x) ;
  pos.SetZ(z) ;
  pos.SetY( TMath::Sqrt(x*x + z*z + Y0*Y0) ) ; 


   Float_t Phi           = GetPHOSAngle( PHOSModule) ; 
   Double_t const RADDEG = 180.0 / kPI ;
   Float_t rPhi          = Phi / RADDEG ; 

   TRotation Rot ;
   Rot.RotateZ(-rPhi) ; // a rotation around Z by angle  
  
   TRotation dummy = Rot.Invert() ;  // to transform from original frame to rotate frame
  
   pos.Transform(Rot) ; // rotate the baby 
  }
  else {
 pos.SetX(0.);
 pos.SetY(0.);
 pos.SetZ(0.);
       }
} 

//____________________________________________________________________________
void AliPHOSGeometry::RelPosInModule(const Int_t * RelId, Float_t & x, Float_t & z) 
{
  Int_t PPSDModule  ; 
  Int_t Row        = RelId[2] ; //offset along z axiz
  Int_t Column     = RelId[3] ; //offset along x axiz

  Float_t PadSizeZ = GetPPSDModuleSize(2)/ GetNumberOfPadsZ();
  Float_t PadSizeX = GetPPSDModuleSize(0)/ GetNumberOfPadsPhi();

  if ( RelId[1] == 0 ) { // its a PbW04 crystal 
    x = -( GetNPhi()/2. - Row   + 0.5 ) *  GetCrystalSize(0) ; // position ox Xtal with respect
    z = ( GetNZ() /2. - Column + 0.5 ) *  GetCrystalSize(2) ; // of center of PHOS module  
   }  
   else  {    
    if ( RelId[1] >  GetNumberOfModulesPhi() *  GetNumberOfModulesZ() )
       PPSDModule =  RelId[1]-GetNumberOfModulesPhi() *  GetNumberOfModulesZ(); 
    else PPSDModule =  RelId[1] ;
    Int_t ModRow = 1+(Int_t)TMath::Ceil( (Float_t)PPSDModule / GetNumberOfModulesPhi()-1. ) ; 
    Int_t ModCol = PPSDModule -  ( ModRow-1 ) * GetNumberOfModulesPhi() ;     
    Float_t x0 = (  GetNumberOfModulesPhi() / 2.  - ModRow  + 0.5 ) * GetPPSDModuleSize(0) ;
    Float_t z0 = (  GetNumberOfModulesZ() / 2.  - ModCol  + 0.5 ) * GetPPSDModuleSize(2)  ;     
    x = - ( GetNumberOfPadsPhi()/2. - Row - 0.5 ) * PadSizeX + x0 ; // position of pad  with respect
    z = ( GetNumberOfPadsZ()/2.   - Column - 0.5 ) * PadSizeZ - z0 ; // of center of PHOS module  
         }
}

//____________________________________________________________________________
void AliPHOSGeometry:: SetPHOSAngles() 
{ 
  Double_t const RADDEG = 180.0 / kPI ;
  Float_t PPHI =  TMath::ATan( fOuterBoxSize[0]  / ( 2.0 * fIPtoOuterCoverDistance ) ) ;
  PPHI *= RADDEG ;
  
  for( Int_t i = 1; i <= fNModules ; i++ ) {
    Float_t angle = PPHI * 2 * ( i - fNModules / 2.0 - 0.5 ) ;
    fPHOSAngle[i-1] = -  angle ;
 } 
}
Commit	Line	Data
d15a28e7	1	/**************************************************************************
	2	* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
	3	* *
	4	* Author: The ALICE Off-line Project. *
	5	* Contributors are mentioned in the code where appropriate. *
	6	* *
	7	* Permission to use, copy, modify and distribute this software and its *
	8	* documentation strictly for non-commercial purposes is hereby granted *
	9	* without fee, provided that the above copyright notice appears in all *
	10	* copies and that both the copyright notice and this permission notice *
	11	* appear in the supporting documentation. The authors make no claims *
	12	* about the suitability of this software for any purpose. It is *
	13	* provided "as is" without express or implied warranty. *
	14	**************************************************************************/
	15
	16	//_________________________________________________________________________
	17	// Geometry class for PHOS version SUBATECH
	18	//*-- Author : Y. Schutz SUBATECH
	19	//////////////////////////////////////////////////////////////////////////////
	20
	21	// --- ROOT system ---
	22
	23	#include "TVector3.h"
	24	#include "TRotation.h"
	25
	26	// --- Standard library ---
	27
9f616d61	28	#include <iostream>
9f616d61	29	#include <cassert>
d15a28e7	30
	31	// --- AliRoot header files ---
	32
	33	#include "AliPHOSGeometry.h"
	34	#include "AliPHOSPpsdRecPoint.h"
	35	#include "AliConst.h"
	36
	37	ClassImp(AliPHOSGeometry)
	38
	39	AliPHOSGeometry * AliPHOSGeometry::fGeom = 0 ;
	40
	41	//____________________________________________________________________________
	42	AliPHOSGeometry::~AliPHOSGeometry(void)
	43	{
	44	fRotMatrixArray->Delete() ;
	45	delete fRotMatrixArray ;
	46	}
	47
	48	//____________________________________________________________________________
	49	Bool_t AliPHOSGeometry::AbsToRelNumbering(const Int_t AbsId, Int_t * RelId)
	50	{
	51	// RelId[0] = PHOS Module number 1:fNModules
	52	// RelId[1] = 0 if PbW04
	53	// = PPSD Module number 1:fNumberOfModulesPhifNumberOfModulesZ2 (2->up and bottom level)
	54	// RelId[2] = Row number inside a PHOS or PPSD module
	55	// RelId[3] = Column number inside a PHOS or PPSD module
	56
	57	Bool_t rv = kTRUE ;
	58	Float_t Id = AbsId ;
	59
	60	Int_t PHOSModuleNumber = (Int_t)TMath:: Ceil( Id / ( GetNPhi() * GetNZ() ) ) ;
	61
	62	if ( PHOSModuleNumber > GetNModules() ) { // its a PPSD pad
	63
	64	Id -= GetNPhi() * GetNZ() * GetNModules() ;
	65	Float_t tempo = 2 * GetNumberOfModulesPhi() * GetNumberOfModulesZ() * GetNumberOfPadsPhi() * GetNumberOfPadsZ() ;
	66	RelId[0] = (Int_t)TMath::Ceil( Id / tempo ) ;
	67	Id -= ( RelId[0] - 1 ) * tempo ;
	68	RelId[1] = (Int_t)TMath::Ceil( Id / ( GetNumberOfPadsPhi() * GetNumberOfPadsZ() ) ) ;
	69	Id -= ( RelId[1] - 1 ) * GetNumberOfPadsPhi() * GetNumberOfPadsZ() ;
	70	RelId[2] = (Int_t)TMath::Ceil( Id / GetNumberOfPadsPhi() ) ;
	71	RelId[3] = (Int_t) ( Id - ( RelId[2] - 1 ) * GetNumberOfPadsPhi() ) ;
	72	}
	73	else { // its a PW04 crystal
	74
	75	RelId[0] = PHOSModuleNumber ;
	76	RelId[1] = 0 ;
	77	Id -= ( PHOSModuleNumber - 1 ) * GetNPhi() * GetNZ() ;
	78	RelId[2] = (Int_t)TMath::Ceil( Id / GetNPhi() ) ;
	79	RelId[3] = (Int_t)( Id - ( RelId[2] - 1 ) * GetNPhi() ) ;
	80	}
	81	return rv ;
	82	}
9f616d61	83	//____________________________________________________________________________
	84	void AliPHOSGeometry::EmcModuleCoverage(const Int_t mod, Double_t & tm, Double_t & tM, Double_t & pm, Double_t & pM, Option_t * opt)
	85	{
	86	// calculates the angular coverage in theta and phi of a EMC module
	87
	88	Double_t conv ;
	89	if ( opt == kRadian )
	90	conv = 1. ;
	91	else if ( opt == kDegre )
	92	conv = 180. / TMath::Pi() ;
	93	else {
	94	cout << "<I> AliPHOSGeometry::EmcXtalCoverage : " << opt << " unknown option; result in radian " << endl ;
	95	conv = 1. ;
	96	}
	97
	98	Float_t phi = GetPHOSAngle(mod) * (TMath::Pi() / 180.) ;
	99	Float_t Y0 = GetIPtoOuterCoverDistance() + GetUpperPlateThickness()
	100	+ GetSecondUpperPlateThickness() + GetUpperCoolingPlateThickness() ;
	101
	102	Double_t angle = TMath::ATan( GetCrystalSize(0)GetNPhi() / (2 Y0) ) ;
	103	phi = phi + 1.5 * TMath::Pi() ; // to follow the convention of the particle generator(PHOS is between 230 and 310 deg.)
	104	Double_t m = phi - angle ;
	105	Double_t M = phi + angle ;
	106	pM = TMath::Max(M, m) * conv ;
	107	pm = TMath::Min(M, m) * conv ;
	108
	109	angle = TMath::ATan( GetCrystalSize(2)GetNZ() / (2 Y0) ) ;
	110	M = TMath::Pi() / 2. + angle ; // to follow the convention of the particle generator(PHOS is at 90 deg.)
	111	m = TMath::Pi() / 2. - angle ;
	112	tM = TMath::Max(M, m) * conv ;
	113	tm = TMath::Min(M, m) * conv ;
	114
	115	}
	116
	117	//____________________________________________________________________________
	118	void AliPHOSGeometry::EmcXtalCoverage(Double_t & theta, Double_t & phi, Option_t * opt)
	119	{
	120	// calculates the angular coverage in theta and phi of a single crystal in a EMC module
	121
	122	Double_t conv ;
	123	if ( opt == kRadian )
	124	conv = 1. ;
	125	else if ( opt == kDegre )
	126	conv = 180. / TMath::Pi() ;
	127	else {
	128	cout << "<I> AliPHOSGeometry::EmcXtalCoverage : " << opt << " unknown option; result in radian " << endl ;
	129	conv = 1. ;
	130	}
	131
	132	Float_t Y0 = GetIPtoOuterCoverDistance() + GetUpperPlateThickness()
	133	+ GetSecondUpperPlateThickness() + GetUpperCoolingPlateThickness() ;
	134	theta = 2 * TMath::ATan( GetCrystalSize(2) / (2 * Y0) ) * conv ;
	135	phi = 2 * TMath::ATan( GetCrystalSize(0) / (2 * Y0) ) * conv ;
	136	}
	137
	138
	139	//____________________________________________________________________________
	140	void AliPHOSGeometry::ImpactOnEmc(const Double_t theta, const Double_t phi, Int_t & ModuleNumber, Double_t & z, Double_t & x)
	141	{
	142	// calculates the impact coordinates of a neutral particle
	143	// emitted in direction theta and phi in ALICE
	144
	145	// searches for the PHOS EMC module
	146	ModuleNumber = 0 ;
147	Double_t tm, tM, pm, pM ;
148	Int_t index = 1 ;
149	while ( ModuleNumber == 0 && index <= GetNModules() ) {
150	EmcModuleCoverage(index, tm, tM, pm, pM) ;
151	if ( (theta >= tm && theta <= tM) && (phi >= pm && phi <= pM ) )
152	ModuleNumber = index ;
153	index++ ;
154	}
155	if ( ModuleNumber != 0 ) {
156	Float_t phi0 = GetPHOSAngle(ModuleNumber) * (TMath::Pi() / 180.) + 1.5 * TMath::Pi() ;
157	Float_t Y0 = GetIPtoOuterCoverDistance() + GetUpperPlateThickness()
158	+ GetSecondUpperPlateThickness() + GetUpperCoolingPlateThickness() ;
159	Double_t angle = phi - phi0;
160	x = Y0 * TMath::Tan(angle) ;
161	angle = theta - TMath::Pi() / 2 ;
162	z = Y0 * TMath::Tan(angle) ;
163	}
164	}
d15a28e7	165
	166	//____________________________________________________________________________
	167	void AliPHOSGeometry::GetGlobal(const AliRecPoint* RecPoint, TVector3 & gpos, TMatrix & gmat)
	168	{
	169
	170	AliPHOSRecPoint * tmpPHOS = (AliPHOSRecPoint *) RecPoint ;
	171	TVector3 LocalPosition ;
	172
	173	tmpPHOS->GetLocalPosition(gpos) ;
	174
	175
	176	if ( tmpPHOS->IsEmc() ) // it is a EMC crystal
	177	{ gpos.SetY( -(GetIPtoOuterCoverDistance() + GetUpperPlateThickness() +
	178	GetSecondUpperPlateThickness() + GetUpperCoolingPlateThickness()) ) ;
	179
	180	}
	181	else
	182	{ // it is a PPSD pad
	183	AliPHOSPpsdRecPoint * tmpPpsd = (AliPHOSPpsdRecPoint *) RecPoint ;
	184	if (tmpPpsd->GetUp() ) // it is an upper module
	185	{
	186	gpos.SetY(-( GetIPtoOuterCoverDistance() - GetMicromegas2Thickness() -
	187	GetLeadToMicro2Gap() - GetLeadConverterThickness() -
	188	GetMicro1ToLeadGap() - GetMicromegas1Thickness() / 2.0 ) ) ;
	189	}
	190	else // it is a lower module
	191	gpos.SetY(-( GetIPtoOuterCoverDistance() - GetMicromegas2Thickness() / 2.0) ) ;
	192	}
	193
	194	Float_t Phi = GetPHOSAngle( tmpPHOS->GetPHOSMod()) ;
	195	Double_t const RADDEG = 180.0 / kPI ;
	196	Float_t rPhi = Phi / RADDEG ;
	197
	198	TRotation Rot ;
	199	Rot.RotateZ(-rPhi) ; // a rotation around Z by angle
	200
	201	TRotation dummy = Rot.Invert() ; // to transform from original frame to rotate frame
	202	gpos.Transform(Rot) ; // rotate the baby
6ad0bfa0	203
d15a28e7	204	}
	205
	206	//____________________________________________________________________________
	207	void AliPHOSGeometry::GetGlobal(const AliRecPoint* RecPoint, TVector3 & gpos)
	208	{
	209	AliPHOSRecPoint * tmpPHOS = (AliPHOSRecPoint *) RecPoint ;
	210	TVector3 LocalPosition ;
	211	tmpPHOS->GetLocalPosition(gpos) ;
	212
	213
	214	if ( tmpPHOS->IsEmc() ) // it is a EMC crystal
	215	{ gpos.SetY( -(GetIPtoOuterCoverDistance() + GetUpperPlateThickness() +
	216	GetSecondUpperPlateThickness() + GetUpperCoolingPlateThickness()) ) ;
	217	}
	218	else
	219	{ // it is a PPSD pad
	220	AliPHOSPpsdRecPoint * tmpPpsd = (AliPHOSPpsdRecPoint *) RecPoint ;
	221	if (tmpPpsd->GetUp() ) // it is an upper module
	222	{
	223	gpos.SetY(-( GetIPtoOuterCoverDistance() - GetMicromegas2Thickness() -
	224	GetLeadToMicro2Gap() - GetLeadConverterThickness() -
	225	GetMicro1ToLeadGap() - GetMicromegas1Thickness() / 2.0 ) ) ;
	226	}
	227	else // it is a lower module
	228	gpos.SetY(-( GetIPtoOuterCoverDistance() - GetMicromegas2Thickness() / 2.0) ) ;
	229	}
	230
	231	Float_t Phi = GetPHOSAngle( tmpPHOS->GetPHOSMod()) ;
	232	Double_t const RADDEG = 180.0 / kPI ;
	233	Float_t rPhi = Phi / RADDEG ;
	234
	235	TRotation Rot ;
	236	Rot.RotateZ(-rPhi) ; // a rotation around Z by angle
	237
	238	TRotation dummy = Rot.Invert() ; // to transform from original frame to rotate frame
	239	gpos.Transform(Rot) ; // rotate the baby
	240	}
	241
	242	//____________________________________________________________________________
	243	void AliPHOSGeometry::Init(void)
	244	{
	245	fRotMatrixArray = new TObjArray(fNModules) ;
	246
	247	cout << "PHOS geometry setup: parameters for option " << fName << " " << fTitle << endl ;
	248	if ( ((strcmp( fName, "default" )) == 0) \|\| ((strcmp( fName, "GPS2" )) == 0) ) {
	249	fInit = kTRUE ;
	250	this->InitPHOS() ;
	251	this->InitPPSD() ;
	252	this->SetPHOSAngles() ;
	253	}
	254	else {
	255	fInit = kFALSE ;
	256	cout << "PHOS Geometry setup: option not defined " << fName << endl ;
	257	}
	258	}
	259
	260	//____________________________________________________________________________
	261	void AliPHOSGeometry::InitPHOS(void)
	262	{
	263	// PHOS
	264
	265	fNPhi = 64 ;
	266	fNZ = 64 ;
	267	fNModules = 5 ;
268
269	fPHOSAngle[0] = 0.0 ; // Module position angles are set in CreateGeometry()
270	fPHOSAngle[1] = 0.0 ;
271	fPHOSAngle[2] = 0.0 ;
272	fPHOSAngle[3] = 0.0 ;
273
274	fXtlSize[0] = 2.2 ;
275	fXtlSize[1] = 18.0 ;
276	fXtlSize[2] = 2.2 ;
277
278	// all these numbers coming next are subject to changes
279
280	fOuterBoxThickness[0] = 2.8 ;
281	fOuterBoxThickness[1] = 5.0 ;
282	fOuterBoxThickness[2] = 5.0 ;
283
284	fUpperPlateThickness = 4.0 ;
285
286	fSecondUpperPlateThickness = 5.0 ;
287
288	fCrystalSupportHeight = 6.95 ;
289	fCrystalWrapThickness = 0.01 ;
290	fCrystalHolderThickness = 0.005 ;
291	fModuleBoxThickness = 2.0 ;
292	fIPtoOuterCoverDistance = 447.0 ;
293	fIPtoCrystalSurface = 460.0 ;
294
295	fPinDiodeSize[0] = 1.0 ;
296	fPinDiodeSize[1] = 0.1 ;
297	fPinDiodeSize[2] = 1.0 ;
298
299	fUpperCoolingPlateThickness = 0.06 ;
300	fSupportPlateThickness = 10.0 ;
301	fLowerThermoPlateThickness = 3.0 ;
302	fLowerTextolitPlateThickness = 1.0 ;
303	fGapBetweenCrystals = 0.03 ;
304
305	fTextolitBoxThickness[0] = 1.5 ;
306	fTextolitBoxThickness[1] = 0.0 ;
307	fTextolitBoxThickness[2] = 3.0 ;
308
309	fAirThickness[0] = 1.56 ;
310	fAirThickness[1] = 20.5175 ;
311	fAirThickness[2] = 2.48 ;
312
313	Float_t XtalModulePhiSize = fNPhi * ( fXtlSize[0] + 2 * fGapBetweenCrystals ) ;
314	Float_t XtalModuleZSize = fNZ * ( fXtlSize[2] + 2 * fGapBetweenCrystals ) ;
315
316	// The next dimensions are calculated from the above parameters
317
318	fOuterBoxSize[0] = XtalModulePhiSize + 2 * ( fAirThickness[0] + fModuleBoxThickness
319	+ fTextolitBoxThickness[0] + fOuterBoxThickness[0] ) ;
320	fOuterBoxSize[1] = ( fXtlSize[1] + fCrystalSupportHeight + fCrystalWrapThickness + fCrystalHolderThickness )
321	+ 2 * (fAirThickness[1] + fModuleBoxThickness + fTextolitBoxThickness[1] + fOuterBoxThickness[1] ) ;
322	fOuterBoxSize[2] = XtalModuleZSize + 2 * ( fAirThickness[2] + fModuleBoxThickness
323	+ fTextolitBoxThickness[2] + fOuterBoxThickness[2] ) ;
324
325	fTextolitBoxSize[0] = fOuterBoxSize[0] - 2 * fOuterBoxThickness[0] ;
326	fTextolitBoxSize[1] = fOuterBoxSize[1] - fOuterBoxThickness[1] - fUpperPlateThickness ;
327	fTextolitBoxSize[2] = fOuterBoxSize[2] - 2 * fOuterBoxThickness[2] ;
328
329	fAirFilledBoxSize[0] = fTextolitBoxSize[0] - 2 * fTextolitBoxThickness[0] ;
330	fAirFilledBoxSize[1] = fTextolitBoxSize[1] - fSecondUpperPlateThickness ;
331	fAirFilledBoxSize[2] = fTextolitBoxSize[2] - 2 * fTextolitBoxThickness[2] ;
332
333	}
334
335	//____________________________________________________________________________
336	void AliPHOSGeometry::InitPPSD(void)
337	{
338	// PPSD
339
340	fAnodeThickness = 0.0009 ;
341	fAvalancheGap = 0.01 ;
342	fCathodeThickness = 0.0009 ;
343	fCompositeThickness = 0.3 ;
9f616d61	344	fConversionGap = 0.6 ;
d15a28e7	345	fLeadConverterThickness = 0.56 ;
	346	fLeadToMicro2Gap = 0.1 ;
	347	fLidThickness = 0.2 ;
	348	fMicro1ToLeadGap = 0.1 ;
	349	fMicromegasWallThickness = 0.6 ;
	350	fNumberOfModulesPhi = 4 ;
	351	fNumberOfModulesZ = 4 ;
	352	fNumberOfPadsPhi = 24 ;
	353	fNumberOfPadsZ = 24 ;
	354	fPCThickness = 0.1 ;
	355	fPhiDisplacement = 0.8 ;
	356	fZDisplacement = 0.8 ;
	357
	358	fMicromegas1Thickness = fLidThickness + 2 * fCompositeThickness + fCathodeThickness + fPCThickness
	359	+ fAnodeThickness + fConversionGap + fAvalancheGap ;
	360	fMicromegas2Thickness = fMicromegas1Thickness ;
	361
	362
	363	fPPSDModuleSize[0] = 38.0 ;
	364	fPPSDModuleSize[1] = fMicromegas1Thickness ;
	365	fPPSDModuleSize[2] = 38.0 ;
	366
	367	fPPSDBoxSize[0] = fNumberOfModulesPhi * fPPSDModuleSize[0] + 2 * fPhiDisplacement ;
	368	fPPSDBoxSize[1] = fMicromegas2Thickness + fMicromegas2Thickness + fLeadConverterThickness + fMicro1ToLeadGap + fLeadToMicro2Gap ;
	369	fPPSDBoxSize[2] = fNumberOfModulesZ * fPPSDModuleSize[2] + 2 * fZDisplacement ;
	370
	371	fIPtoTopLidDistance = fIPtoOuterCoverDistance - fPPSDBoxSize[1] - 1. ;
	372
	373	}
	374
	375	//____________________________________________________________________________
	376	AliPHOSGeometry * AliPHOSGeometry::GetInstance()
	377	{
d15a28e7	378	return (AliPHOSGeometry *) fGeom ;
	379	}
	380
	381	//____________________________________________________________________________
	382	AliPHOSGeometry * AliPHOSGeometry::GetInstance(const Text_t* name, const Text_t* title)
	383	{
	384	AliPHOSGeometry * rv = 0 ;
	385	if ( fGeom == 0 ) {
	386	fGeom = new AliPHOSGeometry(name, title) ;
	387	rv = (AliPHOSGeometry * ) fGeom ;
	388	}
	389	else {
	390	if ( strcmp(fGeom->GetName(), name) != 0 ) {
	391	cout << "AliPHOSGeometry <E> : current geometry is " << fGeom->GetName() << endl
	392	<< " you cannot call " << name << endl ;
	393	}
	394	else
	395	rv = (AliPHOSGeometry *) fGeom ;
	396	}
	397	return rv ;
	398	}
	399
	400	//____________________________________________________________________________
	401	Bool_t AliPHOSGeometry::RelToAbsNumbering(const Int_t * RelId, Int_t & AbsId)
	402	{
	403
	404	// AbsId = 1:fNModules * fNPhi * fNZ -> PbWO4
	405	// AbsId = 1:fNModules * 2 * (fNumberOfModulesPhi * fNumberOfModulesZ) * fNumberOfPadsPhi * fNumberOfPadsZ -> PPSD
	406
	407	Bool_t rv = kTRUE ;
	408
	409	if ( RelId[1] > 0 ) { // its a PPSD pad
	410
	411	AbsId = GetNPhi() * GetNZ() * GetNModules() // the offset to separate emcal crystals from PPSD pads
	412	+ ( RelId[0] - 1 ) * GetNumberOfModulesPhi() * GetNumberOfModulesZ() // the pads offset of PHOS modules
	413	* GetNumberOfPadsPhi() * GetNumberOfPadsZ() * 2
	414	+ ( RelId[1] - 1 ) * GetNumberOfPadsPhi() * GetNumberOfPadsZ() // the pads offset of PPSD modules
	415	+ ( RelId[2] - 1 ) * GetNumberOfPadsPhi() // the pads offset of a PPSD row
	416	+ RelId[3] ; // the column number
	417	}
	418	else {
	419	if ( RelId[1] == 0 ) { // its a Phos crystal
	420	AbsId = ( RelId[0] - 1 ) * GetNPhi() * GetNZ() // the offset of PHOS modules
	421	+ ( RelId[2] - 1 ) * GetNPhi() // the offset of a xtal row
	422	+ RelId[3] ; // the column number
	423	}
	424	}
	425
	426	return rv ;
	427	}
	428
	429	//____________________________________________________________________________
	430
	431	void AliPHOSGeometry::RelPosInAlice(const Int_t Id, TVector3 & pos )
	432	{
	433	if (Id > 0) {
	434
	435	Int_t RelId[4] ;
	436
	437	AbsToRelNumbering(Id , RelId) ;
	438
	439	Int_t PHOSModule = RelId[0] ;
	440
9f616d61	441	Float_t Y0 ;
9f616d61	442
d15a28e7	443	if ( RelId[1] == 0 ) // it is a PbW04 crystal
9f616d61	444	{ Y0 = -(GetIPtoOuterCoverDistance() + GetUpperPlateThickness()
9f616d61	445	+ GetSecondUpperPlateThickness() + GetUpperCoolingPlateThickness()) ;
d15a28e7	446	}
	447	if ( RelId[1] > 0 ) { // its a PPSD pad
	448	if ( RelId[1] > GetNumberOfModulesPhi() * GetNumberOfModulesZ() ) // its an bottom module
	449	{
9f616d61	450	Y0 = -( GetIPtoOuterCoverDistance() - GetMicromegas2Thickness() / 2.0) ;
d15a28e7	451	}
d15a28e7	452	else // its an upper module
9f616d61	453	Y0 = -( GetIPtoOuterCoverDistance() - GetMicromegas2Thickness() - GetLeadToMicro2Gap()
9f616d61	454	- GetLeadConverterThickness() - GetMicro1ToLeadGap() - GetMicromegas1Thickness() / 2.0) ;
d15a28e7	455	}
	456
	457	Float_t x, z ;
	458	RelPosInModule(RelId, x, z) ;
	459
9f616d61	460	pos.SetX(x) ;
	461	pos.SetZ(z) ;
	462	pos.SetY( TMath::Sqrt(xx + zz + Y0*Y0) ) ;
	463
d15a28e7	464
	465
	466	Float_t Phi = GetPHOSAngle( PHOSModule) ;
	467	Double_t const RADDEG = 180.0 / kPI ;
	468	Float_t rPhi = Phi / RADDEG ;
	469
	470	TRotation Rot ;
	471	Rot.RotateZ(-rPhi) ; // a rotation around Z by angle
	472
	473	TRotation dummy = Rot.Invert() ; // to transform from original frame to rotate frame
	474
	475	pos.Transform(Rot) ; // rotate the baby
	476	}
	477	else {
	478	pos.SetX(0.);
	479	pos.SetY(0.);
	480	pos.SetZ(0.);
	481	}
	482	}
	483
	484	//____________________________________________________________________________
	485	void AliPHOSGeometry::RelPosInModule(const Int_t * RelId, Float_t & x, Float_t & z)
	486	{
	487	Int_t PPSDModule ;
	488	Int_t Row = RelId[2] ; //offset along z axiz
	489	Int_t Column = RelId[3] ; //offset along x axiz
	490
	491	Float_t PadSizeZ = GetPPSDModuleSize(2)/ GetNumberOfPadsZ();
	492	Float_t PadSizeX = GetPPSDModuleSize(0)/ GetNumberOfPadsPhi();
	493
	494	if ( RelId[1] == 0 ) { // its a PbW04 crystal
	495	x = -( GetNPhi()/2. - Row + 0.5 ) * GetCrystalSize(0) ; // position ox Xtal with respect
6ad0bfa0	496	z = ( GetNZ() /2. - Column + 0.5 ) * GetCrystalSize(2) ; // of center of PHOS module
d15a28e7	497	}
	498	else {
	499	if ( RelId[1] > GetNumberOfModulesPhi() * GetNumberOfModulesZ() )
	500	PPSDModule = RelId[1]-GetNumberOfModulesPhi() * GetNumberOfModulesZ();
	501	else PPSDModule = RelId[1] ;
	502	Int_t ModRow = 1+(Int_t)TMath::Ceil( (Float_t)PPSDModule / GetNumberOfModulesPhi()-1. ) ;
	503	Int_t ModCol = PPSDModule - ( ModRow-1 ) * GetNumberOfModulesPhi() ;
	504	Float_t x0 = ( GetNumberOfModulesPhi() / 2. - ModRow + 0.5 ) * GetPPSDModuleSize(0) ;
	505	Float_t z0 = ( GetNumberOfModulesZ() / 2. - ModCol + 0.5 ) * GetPPSDModuleSize(2) ;
	506	x = - ( GetNumberOfPadsPhi()/2. - Row - 0.5 ) * PadSizeX + x0 ; // position of pad with respect
6ad0bfa0	507	z = ( GetNumberOfPadsZ()/2. - Column - 0.5 ) * PadSizeZ - z0 ; // of center of PHOS module
d15a28e7	508	}
	509	}
	510
	511	//____________________________________________________________________________
	512	void AliPHOSGeometry:: SetPHOSAngles()
	513	{
	514	Double_t const RADDEG = 180.0 / kPI ;
	515	Float_t PPHI = TMath::ATan( fOuterBoxSize[0] / ( 2.0 * fIPtoOuterCoverDistance ) ) ;
	516	PPHI *= RADDEG ;
	517
	518	for( Int_t i = 1; i <= fNModules ; i++ ) {
	519	Float_t angle = PPHI * 2 * ( i - fNModules / 2.0 - 0.5 ) ;
	520	fPHOSAngle[i-1] = - angle ;
	521	}
	522	}
	523