[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.                  *
 **************************************************************************/

/* $Id$ */

//_________________________________________________________________________
// Geometry class  for PHOS : singleton  
// PHOS consists of the electromagnetic calorimeter (EMCA)
// and a charged particle veto either in the Subatech's version (PPSD)
// or in the IHEP's one (CPV).
// The EMCA/PPSD/CPV modules are parametrized so that any configuration
// can be easily implemented 
// The title is used to identify the version of CPV used.
//                  
//*-- Author: Yves Schutz (SUBATECH) & Dmitri Peressounko (RRC "KI" & SUBATECH)

// --- ROOT system ---

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

// --- Standard library ---

// --- AliRoot header files ---

#include "AliPHOSGeometry.h"
#include "AliPHOSEMCAGeometry.h" 
#include "AliPHOSRecPoint.h"

ClassImp(AliPHOSGeometry) ;

// these initialisations are needed for a singleton
AliPHOSGeometry * AliPHOSGeometry::fgGeom = 0 ;
Bool_t            AliPHOSGeometry::fgInit = kFALSE ;

//____________________________________________________________________________
AliPHOSGeometry::AliPHOSGeometry() {
    // default ctor 
    // must be kept public for root persistency purposes, but should never be called by the outside world
    fPHOSAngle      = 0 ;
    fGeometryEMCA   = 0 ;
    fGeometrySUPP   = 0 ;
    fGeometryCPV    = 0 ;
    fgGeom          = 0 ;
    fRotMatrixArray = 0 ;  
}  

//____________________________________________________________________________
AliPHOSGeometry::~AliPHOSGeometry(void)
{
  // dtor

  if (fRotMatrixArray) fRotMatrixArray->Delete() ; 
  if (fRotMatrixArray) delete fRotMatrixArray ; 
  if (fPHOSAngle     ) delete[] fPHOSAngle ; 
}
//____________________________________________________________________________

void AliPHOSGeometry::Init(void)
{
  // Initializes the PHOS parameters :
  //  IHEP is the Protvino CPV (cathode pad chambers)
  
  TString test(GetName()) ; 
  if (test != "IHEP" ) {
    Fatal("Init", "%s is not a known geometry (choose among IHEP)", test.Data() ) ; 
  }

  fgInit     = kTRUE ; 
  
  fNModules     = 5;
  fAngle        = 20;
  
  fGeometryEMCA = new AliPHOSEMCAGeometry();
  
  fGeometryCPV  = new AliPHOSCPVGeometry ();
  
  fGeometrySUPP = new AliPHOSSupportGeometry();
  
  fPHOSAngle = new Float_t[fNModules] ;
  
  Float_t * emcParams = fGeometryEMCA->GetEMCParams() ;
  
  fPHOSParams[0] =  TMath::Max((Double_t)fGeometryCPV->GetCPVBoxSize(0)/2., 
 			       (Double_t)(emcParams[0] - (emcParams[1]-emcParams[0])*
					  fGeometryCPV->GetCPVBoxSize(1)/2/emcParams[3]));
  fPHOSParams[1] = emcParams[1] ;
  fPHOSParams[2] = TMath::Max((Double_t)emcParams[2], (Double_t)fGeometryCPV->GetCPVBoxSize(2)/2.);
  fPHOSParams[3] = emcParams[3] + fGeometryCPV->GetCPVBoxSize(1)/2. ;
  
  fIPtoUpperCPVsurface = fGeometryEMCA->GetIPtoOuterCoverDistance() - fGeometryCPV->GetCPVBoxSize(1) ;
  
  Int_t index ;
  for ( index = 0; index < fNModules; index++ )
    fPHOSAngle[index] = 0.0 ; // Module position angles are set in CreateGeometry()
  
  this->SetPHOSAngles() ; 
  fRotMatrixArray = new TObjArray(fNModules) ; 
  
}

//____________________________________________________________________________
AliPHOSGeometry *  AliPHOSGeometry::GetInstance() 
{ 
  // Returns the pointer of the unique instance; singleton specific
  
  return static_cast<AliPHOSGeometry *>( fgGeom ) ; 
}

//____________________________________________________________________________
AliPHOSGeometry *  AliPHOSGeometry::GetInstance(const Text_t* name, const Text_t* title) 
{
  // Returns the pointer of the unique instance
  // Creates it with the specified options (name, title) if it does not exist yet

  AliPHOSGeometry * rv = 0  ; 
  if ( fgGeom == 0 ) {
    if ( strcmp(name,"") == 0 ) 
      rv = 0 ;
    else {    
      fgGeom = new AliPHOSGeometry(name, title) ;
      if ( fgInit )
	rv = (AliPHOSGeometry * ) fgGeom ;
      else {
	rv = 0 ; 
	delete fgGeom ; 
	fgGeom = 0 ; 
      }
    }
  }
  else {
    if ( strcmp(fgGeom->GetName(), name) != 0 ) 
      ::Error("GetInstance", "Current geometry is %s. You cannot call %s", fgGeom->GetName(), name) ; 
    else
      rv = (AliPHOSGeometry *) fgGeom ; 
  } 
  return rv ; 
}

//____________________________________________________________________________
void AliPHOSGeometry::SetPHOSAngles() 
{ 
  // Calculates the position of the PHOS modules in ALICE global coordinate system
  
  Double_t const kRADDEG = 180.0 / TMath::Pi() ;
  Float_t pphi =  2 * TMath::ATan( GetOuterBoxSize(0)  / ( 2.0 * GetIPtoUpperCPVsurface() ) ) ;
  pphi *= kRADDEG ;
  if (pphi > fAngle){ 
    Error("SetPHOSAngles", "PHOS modules overlap!\n pphi = %f fAngle = %f", pphi, fAngle);

  }
  pphi = fAngle;
  
  for( Int_t i = 1; i <= fNModules ; i++ ) {
    Float_t angle = pphi * ( i - fNModules / 2.0 - 0.5 ) ;
    fPHOSAngle[i-1] = -  angle ;
  } 
}

//____________________________________________________________________________
Bool_t AliPHOSGeometry::AbsToRelNumbering(const Int_t AbsId, Int_t * relid) const
{
  // Converts the absolute numbering into the following array/
  //  relid[0] = PHOS Module number 1:fNModules 
  //  relid[1] = 0 if PbW04
  //           = -1 if CPV
  //  relid[2] = Row number inside a PHOS module
  //  relid[3] = Column number inside a PHOS module

  Bool_t rv  = kTRUE ; 
  Float_t id = AbsId ;

  Int_t phosmodulenumber = (Int_t)TMath:: Ceil( id / GetNCristalsInModule() ) ; 
  
  if ( phosmodulenumber >  GetNModules() ) { // it is a CPV pad
    
    id -=  GetNPhi() * GetNZ() *  GetNModules() ; 
    Float_t nCPV  = GetNumberOfCPVPadsPhi() * GetNumberOfCPVPadsZ() ;
    relid[0] = (Int_t) TMath::Ceil( id / nCPV ) ;
    relid[1] = -1 ;
    id -= ( relid[0] - 1 ) * nCPV ; 
    relid[2] = (Int_t) TMath::Ceil( id / GetNumberOfCPVPadsZ() ) ;
    relid[3] = (Int_t) ( id - ( relid[2] - 1 ) * GetNumberOfCPVPadsZ() ) ; 
  } 
  else { // it is a PW04 crystal

    relid[0] = phosmodulenumber ;
    relid[1] = 0 ;
    id -= ( phosmodulenumber - 1 ) *  GetNPhi() * GetNZ() ; 
    relid[2] = (Int_t)TMath::Ceil( id / GetNZ() )  ;
    relid[3] = (Int_t)( id - ( relid[2] - 1 ) * GetNZ() ) ; 
  } 
  return rv ; 
}

//____________________________________________________________________________  
void AliPHOSGeometry::EmcModuleCoverage(const Int_t mod, Double_t & tm, Double_t & tM, Double_t & pm, Double_t & pM, Option_t * opt) const 
{
  // calculates the angular coverage in theta and phi of one EMC (=PHOS) module

 Double_t conv ; 
  if ( opt == Radian() ) 
    conv = 1. ; 
  else if ( opt == Degre() )
    conv = 180. / TMath::Pi() ; 
  else {
    Warning("EmcModuleCoverage", "%s unknown option; result in radian", opt) ; 
    conv = 1. ;
      }

  Float_t phi = GetPHOSAngle(mod) *  (TMath::Pi() / 180.)  ;  
  Float_t y0  = GetIPtoCrystalSurface() ; 
  Float_t * strip = fGeometryEMCA->GetStripHalfSize() ;
  Float_t x0  = fGeometryEMCA->GetNStripX()*strip[0] ;
  Float_t z0  = fGeometryEMCA->GetNStripZ()*strip[2] ;
  Double_t angle = TMath::ATan( x0 / y0 ) ;
  phi = phi + 1.5 * TMath::Pi() ; // to follow the convention of the particle generator(PHOS is between 220 and 320 deg.)
  Double_t max  = phi - angle ;
  Double_t min   = phi + angle ;
  pM = TMath::Max(max, min) * conv ;
  pm = TMath::Min(max, min) * conv ; 
  
  angle =  TMath::ATan( z0 /  y0 ) ;
  max  = TMath::Pi() / 2.  + angle ; // to follow the convention of the particle generator(PHOS is at 90 deg.)
  min  = TMath::Pi() / 2.  - angle ;
  tM = TMath::Max(max, min) * conv ;
  tm = TMath::Min(max, min) * conv ; 
 
}

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

  Double_t conv ; 
  if ( opt == Radian() ) 
    conv = 1. ; 
  else if ( opt == Degre() )
    conv = 180. / TMath::Pi() ; 
  else {
    Warning("EmcXtalCoverage", "%s unknown option; result in radian", opt) ;  
    conv = 1. ;
      }

  Float_t y0  = GetIPtoCrystalSurface() ; 
  theta = 2 * TMath::ATan( GetCrystalSize(2) / (2 * y0) ) * conv ;
  phi   = 2 * TMath::ATan( GetCrystalSize(0) / (2 * y0) ) * conv ;
}
 

//____________________________________________________________________________
void AliPHOSGeometry::GetGlobal(const AliRecPoint* RecPoint, TVector3 & gpos, TMatrix & /*gmat*/) const
{
  // Calculates the coordinates of a RecPoint and the error matrix in the ALICE global coordinate system
 
  AliPHOSRecPoint * tmpPHOS = (AliPHOSRecPoint *) RecPoint ;  
  TVector3 localposition ;

  tmpPHOS->GetLocalPosition(gpos) ;


  if ( tmpPHOS->IsEmc() ) // it is a EMC crystal 
    {  gpos.SetY( - GetIPtoCrystalSurface()) ;  

    }
  else
    { // it is a CPV
      gpos.SetY(- GetIPtoUpperCPVsurface()  ) ; 
    }  

  Float_t phi           = GetPHOSAngle( tmpPHOS->GetPHOSMod()) ; 
  Double_t const kRADDEG = 180.0 / TMath::Pi() ;
  Float_t rphi          = phi / kRADDEG ; 
  
  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) const 
{
  // Calculates the coordinates of a RecPoint in the ALICE global coordinate system 

  AliPHOSRecPoint * tmpPHOS = (AliPHOSRecPoint *) RecPoint ;  
  TVector3 localposition ;
  tmpPHOS->GetLocalPosition(gpos) ;


  if ( tmpPHOS->IsEmc() ) // it is a EMC crystal 
    {  gpos.SetY( - GetIPtoCrystalSurface()  ) ;  
    }
  else
    { // it is a CPV
	  gpos.SetY(- GetIPtoUpperCPVsurface()  ) ; 
    }  

  Float_t phi           = GetPHOSAngle( tmpPHOS->GetPHOSMod()) ; 
  Double_t const kRADDEG = 180.0 / TMath::Pi() ;
  Float_t rphi          = phi / kRADDEG ; 
  
  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::ImpactOnEmc(const Double_t theta, const Double_t phi, Int_t & ModuleNumber, Double_t & z, Double_t & x) const
{
  // calculates the impact coordinates on PHOS of a neutral particle  
  // emitted in the direction theta and phi in the ALICE global coordinate system

  // 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  =  GetIPtoCrystalSurface()  ;   
    Double_t angle = phi - phi0; 
    x = y0 * TMath::Tan(angle) ; 
    angle = theta - TMath::Pi() / 2 ; 
    z = y0 * TMath::Tan(angle) ; 
  }
}

//____________________________________________________________________________
Bool_t  AliPHOSGeometry::Impact(const TParticle * particle) const 
{
  // Tells if a particle enters PHOS
  Bool_t in=kFALSE;
  Int_t moduleNumber=0;
  Double_t z,x;
  ImpactOnEmc(particle->Theta(),particle->Phi(),moduleNumber,z,x);
  if(moduleNumber) 
    in=kTRUE;
  else 
    in=kFALSE;
  return in;
}

//____________________________________________________________________________
Bool_t AliPHOSGeometry::RelToAbsNumbering(const Int_t * relid, Int_t &  AbsId) const
{
  // Converts the relative numbering into the absolute numbering
  // EMCA crystals:
  //  AbsId = from 1 to fNModules * fNPhi * fNZ
  // CPV pad:
  //  AbsId = from N(total PHOS crystals) + 1
  //          to NCPVModules * fNumberOfCPVPadsPhi * fNumberOfCPVPadsZ

  Bool_t rv = kTRUE ; 
  
  if ( relid[1] ==  0 ) {                            // it is a Phos crystal
    AbsId =
      ( relid[0] - 1 ) * GetNPhi() * GetNZ()         // the offset of PHOS modules
      + ( relid[2] - 1 ) * GetNZ()                   // the offset along phi
      +   relid[3] ;                                 // the offset along z
  }
  else { // it is a CPV pad
    AbsId =    GetNPhi() * GetNZ() *  GetNModules()         // the offset to separate EMCA crystals from CPV pads
      + ( relid[0] - 1 ) * GetNumberOfCPVPadsPhi() * GetNumberOfCPVPadsZ()   // the pads offset of PHOS modules 
      + ( relid[2] - 1 ) * GetNumberOfCPVPadsZ()                             // the pads offset of a CPV row
      +   relid[3] ;                                                         // the column number
  }
  
  return rv ; 
}

//____________________________________________________________________________

void AliPHOSGeometry::RelPosInAlice(const Int_t id, TVector3 & pos ) const
{
  // Converts the absolute numbering into the global ALICE coordinate system
  
    
    Int_t relid[4] ;
    
    AbsToRelNumbering(id , relid) ;
    
    Int_t phosmodule = relid[0] ; 
    
    Float_t y0 = 0 ; 
    
    if ( relid[1] == 0 )  // it is a PbW04 crystal 
      y0 =  - GetIPtoCrystalSurface() ;  
    else
      y0 =  - GetIPtoUpperCPVsurface() ; 

    Float_t x, z ; 
    RelPosInModule(relid, x, z) ; 
    
    pos.SetX(x) ;
    pos.SetZ(z) ;
    pos.SetY(y0) ;
    
    Float_t phi           = GetPHOSAngle( phosmodule) ; 
    Double_t const kRADDEG = 180.0 / TMath::Pi() ;
    Float_t rphi          = phi / kRADDEG ; 
    
    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 
} 

//____________________________________________________________________________
void AliPHOSGeometry::RelPosInModule(const Int_t * relid, Float_t & x, Float_t & z) const 
{
  // Converts the relative numbering into the local PHOS-module (x, z) coordinates
  // Note: sign of z differs from that in the previous version (Yu.Kharlov, 12 Oct 2000)
  
  Int_t row        = relid[2] ; //offset along x axis
  Int_t column     = relid[3] ; //offset along z axis

  
  if ( relid[1] == 0 ) { // its a PbW04 crystal
    x = - ( GetNPhi()/2. - row    + 0.5 ) *  GetCellStep() ; // position of Xtal with respect
    z =   ( GetNZ()  /2. - column + 0.5 ) *  GetCellStep() ; // of center of PHOS module  
  }  
  else  {    
    x = - ( GetNumberOfCPVPadsPhi()/2. - row    - 0.5 ) * GetPadSizePhi()  ; // position of pad  with respect
    z =   ( GetNumberOfCPVPadsZ()  /2. - column - 0.5 ) * GetPadSizeZ()  ; // of center of PHOS module  
  }
}
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
b2a60966	16	/* $Id$ */
b2a60966	17
d15a28e7	18	//_________________________________________________________________________
b2a60966	19	// Geometry class for PHOS : singleton
a3dfe79c	20	// PHOS consists of the electromagnetic calorimeter (EMCA)
	21	// and a charged particle veto either in the Subatech's version (PPSD)
	22	// or in the IHEP's one (CPV).
	23	// The EMCA/PPSD/CPV modules are parametrized so that any configuration
	24	// can be easily implemented
	25	// The title is used to identify the version of CPV used.
b2a60966	26	//
710f859a	27	//*-- Author: Yves Schutz (SUBATECH) & Dmitri Peressounko (RRC "KI" & SUBATECH)
d15a28e7	28
	29	// --- ROOT system ---
	30
	31	#include "TVector3.h"
	32	#include "TRotation.h"
e957fea8	33	#include "TParticle.h"
d15a28e7	34
	35	// --- Standard library ---
	36
d15a28e7	37	// --- AliRoot header files ---
	38
	39	#include "AliPHOSGeometry.h"
468794ea	40	#include "AliPHOSEMCAGeometry.h"
710f859a	41	#include "AliPHOSRecPoint.h"
d15a28e7	42
9ec91567	43	ClassImp(AliPHOSGeometry) ;
d15a28e7	44
a4e98857	45	// these initialisations are needed for a singleton
9ec91567	46	AliPHOSGeometry * AliPHOSGeometry::fgGeom = 0 ;
282c5906	47	Bool_t AliPHOSGeometry::fgInit = kFALSE ;
9ec91567	48
e957fea8	49	//____________________________________________________________________________
	50	AliPHOSGeometry::AliPHOSGeometry() {
	51	// default ctor
	52	// must be kept public for root persistency purposes, but should never be called by the outside world
	53	fPHOSAngle = 0 ;
	54	fGeometryEMCA = 0 ;
	55	fGeometrySUPP = 0 ;
	56	fGeometryCPV = 0 ;
	57	fgGeom = 0 ;
	58	fRotMatrixArray = 0 ;
	59	}
	60
d15a28e7	61	//____________________________________________________________________________
	62	AliPHOSGeometry::~AliPHOSGeometry(void)
	63	{
b2a60966	64	// dtor
b2a60966	65
52a36ffd	66	if (fRotMatrixArray) fRotMatrixArray->Delete() ;
52a36ffd	67	if (fRotMatrixArray) delete fRotMatrixArray ;
fa0bc588	68	if (fPHOSAngle ) delete[] fPHOSAngle ;
52a36ffd	69	}
52a36ffd	70	//____________________________________________________________________________
	71
	72	void AliPHOSGeometry::Init(void)
	73	{
a4e98857	74	// Initializes the PHOS parameters :
a4e98857	75	// IHEP is the Protvino CPV (cathode pad chambers)
710f859a	76
809cd394	77	TString test(GetName()) ;
22b8277f	78	if (test != "IHEP" ) {
22b8277f	79	Fatal("Init", "%s is not a known geometry (choose among IHEP)", test.Data() ) ;
809cd394	80	}
809cd394	81
710f859a	82	fgInit = kTRUE ;
	83
	84	fNModules = 5;
	85	fAngle = 20;
	86
	87	fGeometryEMCA = new AliPHOSEMCAGeometry();
	88
	89	fGeometryCPV = new AliPHOSCPVGeometry ();
	90
	91	fGeometrySUPP = new AliPHOSSupportGeometry();
	92
	93	fPHOSAngle = new Float_t[fNModules] ;
	94
	95	Float_t * emcParams = fGeometryEMCA->GetEMCParams() ;
	96
581e32d4	97	fPHOSParams[0] = TMath::Max((Double_t)fGeometryCPV->GetCPVBoxSize(0)/2.,
a83b6179	98	(Double_t)(emcParams[0] - (emcParams[1]-emcParams[0])*
a83b6179	99	fGeometryCPV->GetCPVBoxSize(1)/2/emcParams[3]));
710f859a	100	fPHOSParams[1] = emcParams[1] ;
581e32d4	101	fPHOSParams[2] = TMath::Max((Double_t)emcParams[2], (Double_t)fGeometryCPV->GetCPVBoxSize(2)/2.);
710f859a	102	fPHOSParams[3] = emcParams[3] + fGeometryCPV->GetCPVBoxSize(1)/2. ;
	103
	104	fIPtoUpperCPVsurface = fGeometryEMCA->GetIPtoOuterCoverDistance() - fGeometryCPV->GetCPVBoxSize(1) ;
	105
	106	Int_t index ;
	107	for ( index = 0; index < fNModules; index++ )
52a36ffd	108	fPHOSAngle[index] = 0.0 ; // Module position angles are set in CreateGeometry()
710f859a	109
	110	this->SetPHOSAngles() ;
	111	fRotMatrixArray = new TObjArray(fNModules) ;
	112
52a36ffd	113	}
	114
	115	//____________________________________________________________________________
	116	AliPHOSGeometry * AliPHOSGeometry::GetInstance()
	117	{
a4e98857	118	// Returns the pointer of the unique instance; singleton specific
a4e98857	119
809cd394	120	return static_cast<AliPHOSGeometry *>( fgGeom ) ;
52a36ffd	121	}
	122
	123	//____________________________________________________________________________
	124	AliPHOSGeometry * AliPHOSGeometry::GetInstance(const Text_t* name, const Text_t* title)
	125	{
	126	// Returns the pointer of the unique instance
a4e98857	127	// Creates it with the specified options (name, title) if it does not exist yet
a4e98857	128
52a36ffd	129	AliPHOSGeometry * rv = 0 ;
	130	if ( fgGeom == 0 ) {
	131	if ( strcmp(name,"") == 0 )
	132	rv = 0 ;
	133	else {
	134	fgGeom = new AliPHOSGeometry(name, title) ;
	135	if ( fgInit )
	136	rv = (AliPHOSGeometry * ) fgGeom ;
	137	else {
	138	rv = 0 ;
	139	delete fgGeom ;
	140	fgGeom = 0 ;
	141	}
	142	}
	143	}
	144	else {
21cd0c07	145	if ( strcmp(fgGeom->GetName(), name) != 0 )
21cd0c07	146	::Error("GetInstance", "Current geometry is %s. You cannot call %s", fgGeom->GetName(), name) ;
52a36ffd	147	else
	148	rv = (AliPHOSGeometry *) fgGeom ;
	149	}
	150	return rv ;
	151	}
4697edca	152
52a36ffd	153	//____________________________________________________________________________
	154	void AliPHOSGeometry::SetPHOSAngles()
	155	{
a4e98857	156	// Calculates the position of the PHOS modules in ALICE global coordinate system
52a36ffd	157
a8c47ab6	158	Double_t const kRADDEG = 180.0 / TMath::Pi() ;
710f859a	159	Float_t pphi = 2 * TMath::ATan( GetOuterBoxSize(0) / ( 2.0 * GetIPtoUpperCPVsurface() ) ) ;
52a36ffd	160	pphi *= kRADDEG ;
710f859a	161	if (pphi > fAngle){
21cd0c07	162	Error("SetPHOSAngles", "PHOS modules overlap!\n pphi = %f fAngle = %f", pphi, fAngle);
710f859a	163
710f859a	164	}
ed4205d8	165	pphi = fAngle;
52a36ffd	166
52a36ffd	167	for( Int_t i = 1; i <= fNModules ; i++ ) {
ed4205d8	168	Float_t angle = pphi * ( i - fNModules / 2.0 - 0.5 ) ;
52a36ffd	169	fPHOSAngle[i-1] = - angle ;
52a36ffd	170	}
d15a28e7	171	}
	172
	173	//____________________________________________________________________________
7b7c1533	174	Bool_t AliPHOSGeometry::AbsToRelNumbering(const Int_t AbsId, Int_t * relid) const
d15a28e7	175	{
b2a60966	176	// Converts the absolute numbering into the following array/
	177	// relid[0] = PHOS Module number 1:fNModules
	178	// relid[1] = 0 if PbW04
710f859a	179	// = -1 if CPV
	180	// relid[2] = Row number inside a PHOS module
	181	// relid[3] = Column number inside a PHOS module
d15a28e7	182
d15a28e7	183	Bool_t rv = kTRUE ;
92862013	184	Float_t id = AbsId ;
d15a28e7	185
710f859a	186	Int_t phosmodulenumber = (Int_t)TMath:: Ceil( id / GetNCristalsInModule() ) ;
d15a28e7	187
710f859a	188	if ( phosmodulenumber > GetNModules() ) { // it is a CPV pad
	189
	190	id -= GetNPhi() * GetNZ() * GetNModules() ;
	191	Float_t nCPV = GetNumberOfCPVPadsPhi() * GetNumberOfCPVPadsZ() ;
	192	relid[0] = (Int_t) TMath::Ceil( id / nCPV ) ;
	193	relid[1] = -1 ;
	194	id -= ( relid[0] - 1 ) * nCPV ;
	195	relid[2] = (Int_t) TMath::Ceil( id / GetNumberOfCPVPadsZ() ) ;
	196	relid[3] = (Int_t) ( id - ( relid[2] - 1 ) * GetNumberOfCPVPadsZ() ) ;
d15a28e7	197	}
710f859a	198	else { // it is a PW04 crystal
d15a28e7	199
92862013	200	relid[0] = phosmodulenumber ;
	201	relid[1] = 0 ;
	202	id -= ( phosmodulenumber - 1 ) * GetNPhi() * GetNZ() ;
710f859a	203	relid[2] = (Int_t)TMath::Ceil( id / GetNZ() ) ;
710f859a	204	relid[3] = (Int_t)( id - ( relid[2] - 1 ) * GetNZ() ) ;
d15a28e7	205	}
	206	return rv ;
	207	}
52a36ffd	208
9f616d61	209	//____________________________________________________________________________
7b7c1533	210	void AliPHOSGeometry::EmcModuleCoverage(const Int_t mod, Double_t & tm, Double_t & tM, Double_t & pm, Double_t & pM, Option_t * opt) const
9f616d61	211	{
a4e98857	212	// calculates the angular coverage in theta and phi of one EMC (=PHOS) module
9f616d61	213
9f616d61	214	Double_t conv ;
cf0c2bc1	215	if ( opt == Radian() )
9f616d61	216	conv = 1. ;
cf0c2bc1	217	else if ( opt == Degre() )
9f616d61	218	conv = 180. / TMath::Pi() ;
9f616d61	219	else {
21cd0c07	220	Warning("EmcModuleCoverage", "%s unknown option; result in radian", opt) ;
9f616d61	221	conv = 1. ;
	222	}
	223
710f859a	224	Float_t phi = GetPHOSAngle(mod) * (TMath::Pi() / 180.) ;
710f859a	225	Float_t y0 = GetIPtoCrystalSurface() ;
88cb7938	226	Float_t * strip = fGeometryEMCA->GetStripHalfSize() ;
	227	Float_t x0 = fGeometryEMCA->GetNStripX()*strip[0] ;
	228	Float_t z0 = fGeometryEMCA->GetNStripZ()*strip[2] ;
	229	Double_t angle = TMath::ATan( x0 / y0 ) ;
710f859a	230	phi = phi + 1.5 * TMath::Pi() ; // to follow the convention of the particle generator(PHOS is between 220 and 320 deg.)
92862013	231	Double_t max = phi - angle ;
	232	Double_t min = phi + angle ;
	233	pM = TMath::Max(max, min) * conv ;
	234	pm = TMath::Min(max, min) * conv ;
9f616d61	235
88cb7938	236	angle = TMath::ATan( z0 / y0 ) ;
92862013	237	max = TMath::Pi() / 2. + angle ; // to follow the convention of the particle generator(PHOS is at 90 deg.)
	238	min = TMath::Pi() / 2. - angle ;
	239	tM = TMath::Max(max, min) * conv ;
	240	tm = TMath::Min(max, min) * conv ;
9f616d61	241
	242	}
	243
	244	//____________________________________________________________________________
7b7c1533	245	void AliPHOSGeometry::EmcXtalCoverage(Double_t & theta, Double_t & phi, Option_t * opt) const
9f616d61	246	{
a4e98857	247	// calculates the angular coverage in theta and phi of a single crystal in a EMC(=PHOS) module
9f616d61	248
9f616d61	249	Double_t conv ;
cf0c2bc1	250	if ( opt == Radian() )
9f616d61	251	conv = 1. ;
cf0c2bc1	252	else if ( opt == Degre() )
9f616d61	253	conv = 180. / TMath::Pi() ;
9f616d61	254	else {
21cd0c07	255	Warning("EmcXtalCoverage", "%s unknown option; result in radian", opt) ;
9f616d61	256	conv = 1. ;
	257	}
	258
710f859a	259	Float_t y0 = GetIPtoCrystalSurface() ;
92862013	260	theta = 2 * TMath::ATan( GetCrystalSize(2) / (2 * y0) ) * conv ;
92862013	261	phi = 2 * TMath::ATan( GetCrystalSize(0) / (2 * y0) ) * conv ;
9f616d61	262	}
	263
	264
	265	//____________________________________________________________________________
4c7fd00f	266	void AliPHOSGeometry::GetGlobal(const AliRecPoint* RecPoint, TVector3 & gpos, TMatrix & /gmat/) const
d15a28e7	267	{
a4e98857	268	// Calculates the coordinates of a RecPoint and the error matrix in the ALICE global coordinate system
b2a60966	269
d15a28e7	270	AliPHOSRecPoint * tmpPHOS = (AliPHOSRecPoint *) RecPoint ;
92862013	271	TVector3 localposition ;
d15a28e7	272
	273	tmpPHOS->GetLocalPosition(gpos) ;
	274
	275
	276	if ( tmpPHOS->IsEmc() ) // it is a EMC crystal
710f859a	277	{ gpos.SetY( - GetIPtoCrystalSurface()) ;
d15a28e7	278
	279	}
	280	else
710f859a	281	{ // it is a CPV
710f859a	282	gpos.SetY(- GetIPtoUpperCPVsurface() ) ;
d15a28e7	283	}
d15a28e7	284
92862013	285	Float_t phi = GetPHOSAngle( tmpPHOS->GetPHOSMod()) ;
a8c47ab6	286	Double_t const kRADDEG = 180.0 / TMath::Pi() ;
92862013	287	Float_t rphi = phi / kRADDEG ;
d15a28e7	288
92862013	289	TRotation rot ;
92862013	290	rot.RotateZ(-rphi) ; // a rotation around Z by angle
d15a28e7	291
92862013	292	TRotation dummy = rot.Invert() ; // to transform from original frame to rotate frame
92862013	293	gpos.Transform(rot) ; // rotate the baby
6ad0bfa0	294
d15a28e7	295	}
	296
	297	//____________________________________________________________________________
5cda30f6	298	void AliPHOSGeometry::GetGlobal(const AliRecPoint* RecPoint, TVector3 & gpos) const
d15a28e7	299	{
a4e98857	300	// Calculates the coordinates of a RecPoint in the ALICE global coordinate system
b2a60966	301
d15a28e7	302	AliPHOSRecPoint * tmpPHOS = (AliPHOSRecPoint *) RecPoint ;
92862013	303	TVector3 localposition ;
d15a28e7	304	tmpPHOS->GetLocalPosition(gpos) ;
	305
	306
	307	if ( tmpPHOS->IsEmc() ) // it is a EMC crystal
710f859a	308	{ gpos.SetY( - GetIPtoCrystalSurface() ) ;
d15a28e7	309	}
d15a28e7	310	else
710f859a	311	{ // it is a CPV
710f859a	312	gpos.SetY(- GetIPtoUpperCPVsurface() ) ;
d15a28e7	313	}
d15a28e7	314
92862013	315	Float_t phi = GetPHOSAngle( tmpPHOS->GetPHOSMod()) ;
a8c47ab6	316	Double_t const kRADDEG = 180.0 / TMath::Pi() ;
92862013	317	Float_t rphi = phi / kRADDEG ;
d15a28e7	318
92862013	319	TRotation rot ;
92862013	320	rot.RotateZ(-rphi) ; // a rotation around Z by angle
d15a28e7	321
92862013	322	TRotation dummy = rot.Invert() ; // to transform from original frame to rotate frame
92862013	323	gpos.Transform(rot) ; // rotate the baby
d15a28e7	324	}
	325
	326	//____________________________________________________________________________
7b7c1533	327	void AliPHOSGeometry::ImpactOnEmc(const Double_t theta, const Double_t phi, Int_t & ModuleNumber, Double_t & z, Double_t & x) const
d15a28e7	328	{
a4e98857	329	// calculates the impact coordinates on PHOS of a neutral particle
a4e98857	330	// emitted in the direction theta and phi in the ALICE global coordinate system
d15a28e7	331
52a36ffd	332	// searches for the PHOS EMC module
	333	ModuleNumber = 0 ;
	334	Double_t tm, tM, pm, pM ;
	335	Int_t index = 1 ;
	336	while ( ModuleNumber == 0 && index <= GetNModules() ) {
	337	EmcModuleCoverage(index, tm, tM, pm, pM) ;
88cb7938	338	if ( (theta >= tm && theta <= tM) && (phi >= pm && phi <= pM ) )
52a36ffd	339	ModuleNumber = index ;
52a36ffd	340	index++ ;
d15a28e7	341	}
52a36ffd	342	if ( ModuleNumber != 0 ) {
52a36ffd	343	Float_t phi0 = GetPHOSAngle(ModuleNumber) * (TMath::Pi() / 180.) + 1.5 * TMath::Pi() ;
710f859a	344	Float_t y0 = GetIPtoCrystalSurface() ;
88cb7938	345	Double_t angle = phi - phi0;
52a36ffd	346	x = y0 * TMath::Tan(angle) ;
	347	angle = theta - TMath::Pi() / 2 ;
	348	z = y0 * TMath::Tan(angle) ;
d15a28e7	349	}
d15a28e7	350	}
d15a28e7	351
e957fea8	352	//____________________________________________________________________________
1c9d8212	353	Bool_t AliPHOSGeometry::Impact(const TParticle * particle) const
1c9d8212	354	{
e957fea8	355	// Tells if a particle enters PHOS
	356	Bool_t in=kFALSE;
	357	Int_t moduleNumber=0;
1c9d8212	358	Double_t z,x;
e957fea8	359	ImpactOnEmc(particle->Theta(),particle->Phi(),moduleNumber,z,x);
	360	if(moduleNumber)
	361	in=kTRUE;
	362	else
	363	in=kFALSE;
	364	return in;
1c9d8212	365	}
1c9d8212	366
d15a28e7	367	//____________________________________________________________________________
7b7c1533	368	Bool_t AliPHOSGeometry::RelToAbsNumbering(const Int_t * relid, Int_t & AbsId) const
d15a28e7	369	{
b2a60966	370	// Converts the relative numbering into the absolute numbering
ed4205d8	371	// EMCA crystals:
ed4205d8	372	// AbsId = from 1 to fNModules * fNPhi * fNZ
ed4205d8	373	// CPV pad:
	374	// AbsId = from N(total PHOS crystals) + 1
	375	// to NCPVModules * fNumberOfCPVPadsPhi * fNumberOfCPVPadsZ
d15a28e7	376
d15a28e7	377	Bool_t rv = kTRUE ;
710f859a	378
710f859a	379	if ( relid[1] == 0 ) { // it is a Phos crystal
52a36ffd	380	AbsId =
710f859a	381	( relid[0] - 1 ) * GetNPhi() * GetNZ() // the offset of PHOS modules
	382	+ ( relid[2] - 1 ) * GetNZ() // the offset along phi
	383	+ relid[3] ; // the offset along z
d15a28e7	384	}
710f859a	385	else { // it is a CPV pad
	386	AbsId = GetNPhi() * GetNZ() * GetNModules() // the offset to separate EMCA crystals from CPV pads
	387	+ ( relid[0] - 1 ) * GetNumberOfCPVPadsPhi() * GetNumberOfCPVPadsZ() // the pads offset of PHOS modules
	388	+ ( relid[2] - 1 ) * GetNumberOfCPVPadsZ() // the pads offset of a CPV row
52a36ffd	389	+ relid[3] ; // the column number
	390	}
	391
d15a28e7	392	return rv ;
	393	}
	394
	395	//____________________________________________________________________________
	396
7b7c1533	397	void AliPHOSGeometry::RelPosInAlice(const Int_t id, TVector3 & pos ) const
d15a28e7	398	{
a4e98857	399	// Converts the absolute numbering into the global ALICE coordinate system
b2a60966	400
ed4205d8	401
	402	Int_t relid[4] ;
	403
	404	AbsToRelNumbering(id , relid) ;
	405
	406	Int_t phosmodule = relid[0] ;
	407
	408	Float_t y0 = 0 ;
	409
710f859a	410	if ( relid[1] == 0 ) // it is a PbW04 crystal
	411	y0 = - GetIPtoCrystalSurface() ;
	412	else
	413	y0 = - GetIPtoUpperCPVsurface() ;
	414
ed4205d8	415	Float_t x, z ;
	416	RelPosInModule(relid, x, z) ;
	417
	418	pos.SetX(x) ;
	419	pos.SetZ(z) ;
710f859a	420	pos.SetY(y0) ;
ed4205d8	421
ed4205d8	422	Float_t phi = GetPHOSAngle( phosmodule) ;
a8c47ab6	423	Double_t const kRADDEG = 180.0 / TMath::Pi() ;
ed4205d8	424	Float_t rphi = phi / kRADDEG ;
	425
	426	TRotation rot ;
	427	rot.RotateZ(-rphi) ; // a rotation around Z by angle
	428
	429	TRotation dummy = rot.Invert() ; // to transform from original frame to rotate frame
	430
	431	pos.Transform(rot) ; // rotate the baby
d15a28e7	432	}
	433
	434	//____________________________________________________________________________
7b7c1533	435	void AliPHOSGeometry::RelPosInModule(const Int_t * relid, Float_t & x, Float_t & z) const
d15a28e7	436	{
b2a60966	437	// Converts the relative numbering into the local PHOS-module (x, z) coordinates
52a36ffd	438	// Note: sign of z differs from that in the previous version (Yu.Kharlov, 12 Oct 2000)
b2a60966	439
786222b3	440	Int_t row = relid[2] ; //offset along x axis
786222b3	441	Int_t column = relid[3] ; //offset along z axis
d15a28e7	442
ed4205d8	443
66c3e8ff	444	if ( relid[1] == 0 ) { // its a PbW04 crystal
	445	x = - ( GetNPhi()/2. - row + 0.5 ) * GetCellStep() ; // position of Xtal with respect
	446	z = ( GetNZ() /2. - column + 0.5 ) * GetCellStep() ; // of center of PHOS module
52a36ffd	447	}
52a36ffd	448	else {
710f859a	449	x = - ( GetNumberOfCPVPadsPhi()/2. - row - 0.5 ) * GetPadSizePhi() ; // position of pad with respect
710f859a	450	z = ( GetNumberOfCPVPadsZ() /2. - column - 0.5 ) * GetPadSizeZ() ; // of center of PHOS module
52a36ffd	451	}
2f3366b6	452	}