[u/mrichter/AliRoot.git] / EMCAL / AliEMCALGeometry.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 EMCAL : singleton  
// EMCAL consists of layers of scintillator and lead
// Places the the Barrel Geometry of The EMCAL at Midrapidity
// between 0 and 120 degrees of Phi and
// -0.7 to 0.7 in eta 
// Number of Modules and Layers may be controlled by 
// the name of the instance defined               
// EMCALArch2x has more modules along both phi and eta
// EMCALArchxa has less Layers in the Radial Direction
//*-- Author: Sahal Yacoob (LBL / UCT)
//     and  : Yves Schutz (SUBATECH)
//     and  : Jennifer Klay (LBL)

// --- AliRoot header files ---
#include <TMath.h>
#include <TVector3.h>

// -- ALICE Headers.
//#include "AliConst.h"

// --- EMCAL headers
#include "AliEMCALGeometry.h"

ClassImp(AliEMCALGeometry);

AliEMCALGeometry *AliEMCALGeometry::fgGeom = 0;
Bool_t            AliEMCALGeometry::fgInit = kFALSE;

//______________________________________________________________________
AliEMCALGeometry::~AliEMCALGeometry(void){
    // dtor
}

//______________________________________________________________________
const Bool_t AliEMCALGeometry::AreInSameTower(Int_t id1, Int_t id2) const {
  // Find out whether two hits are in the same tower
  Int_t idmax = TMath::Max(id1, id2) ; 
  Int_t idmin = TMath::Min(id1, id2) ;
  if ( ((idmax - GetNZ() * GetNPhi()) == idmin ) || 
       ((idmax - 2 * GetNZ() * GetNPhi()) == idmin ) )
    return kTRUE ; 
  else 
    return kFALSE ; 
}

//______________________________________________________________________
void AliEMCALGeometry::Init(void){
  // Initializes the EMCAL parameters
  // naming convention : GUV_WX_N_ gives the composition of a tower
  // WX inform about the composition of the EM calorimeter section: 
  //   thickness in mm of Pb radiator (W) and of scintillator (X), and number of scintillator layers (N)
  // New geometry: EMCAL_55_25

  fgInit = kFALSE; // Assume failed until proven otherwise.
  TString name(GetName()) ; 
  if (name == "EMCAL_55_25") {
    fECPbRadThickness  = 0.5;  // cm, Thickness of the Pb radiators
    fECScintThick      = 0.5;  // cm, Thickness of the scintillator
    fNECLayers         = 25;   // number of scintillator layers
    
    fSampling          = 11.8; 
 
    fAlFrontThick      = 3.5;  // cm, Thickness of front Al layer
    fGap2Active        = 1.0;  // cm, Gap between Al and 1st Scintillator
  }
  else if( name == "G56_2_55_19" || name == "EMCAL_5655_21" || name == "G56_2_55_19_104_14"|| name == "G65_2_64_19" || name == "EMCAL_6564_21"){
    Fatal("Init", "%s is an old geometry! Please update your Config file", name.Data()) ;
  }
  else
    Fatal("Init", "%s is an undefined geometry!", name.Data()) ; 
		 
  // geometry
  fNZ             = 114;	// granularity along Z (eta) 
  fNPhi           = 168;	// granularity in phi (azimuth)
  fArm1PhiMin     = 60.0;	// degrees, Starting EMCAL Phi position
  fArm1PhiMax     = 180.0;	// degrees, Ending EMCAL Phi position
  fArm1EtaMin     = -0.7;	// pseudorapidity, Starting EMCAL Eta position
  fArm1EtaMax     = +0.7;	// pseudorapidity, Ending EMCAL Eta position
  
  fIPDistance     = 454.0; // cm, Radial distance to inner surface of EMCAL

  //There is always one more scintillator than radiator layer because of the first block of aluminium
  fShellThickness = fAlFrontThick + fGap2Active + fNECLayers*GetECScintThick()+(fNECLayers-1)*GetECPbRadThick();

  fZLength        = 2.*ZFromEtaR(fIPDistance+fShellThickness,fArm1EtaMax); // Z coverage
  fEnvelop[0]     = fIPDistance; // mother volume inner radius
  fEnvelop[1]     = fIPDistance + fShellThickness; // mother volume outer r.
  fEnvelop[2]     = 1.00001*fZLength; // add some padding for mother volume. 
  
  fgInit = kTRUE; 
  
  if (gDebug) {
    printf("Init: geometry of EMCAL named %s is as follows:", name.Data());
    printf( "               ECAL      : %d x (%f mm Pb, %f mm Sc) \n", GetNECLayers(), GetECPbRadThick(), GetECScintThick() ) ; 
    printf("Granularity: %d in eta and %d in phi\n", GetNZ(), GetNPhi()) ;
    printf("Layout: phi = (%f, %f), eta = (%f, %f), y = %f\n",  
	   GetArm1PhiMin(), GetArm1PhiMax(),GetArm1EtaMin(), GetArm1EtaMax(), GetIPDistance() ) ;    
  }
}

//______________________________________________________________________
AliEMCALGeometry *  AliEMCALGeometry::GetInstance(){ 
  // Returns the pointer of the unique instance
  
  return static_cast<AliEMCALGeometry *>( fgGeom ) ; 
}

//______________________________________________________________________
AliEMCALGeometry* AliEMCALGeometry::GetInstance(const Text_t* name,
						const Text_t* title){
    // Returns the pointer of the unique instance

    AliEMCALGeometry * rv = 0; 
    if ( fgGeom == 0 ) {
	if ( strcmp(name,"") == 0 ) rv = 0;
	else {    
	    fgGeom = new AliEMCALGeometry(name, title);
	    if ( fgInit ) rv = (AliEMCALGeometry * ) fgGeom;
	    else {
		rv = 0; 
		delete fgGeom; 
		fgGeom = 0; 
	    } // end if fgInit
	} // end if strcmp(name,"")
    }else{
	if ( strcmp(fgGeom->GetName(), name) != 0 ) {
	  printf("\ncurrent geometry is ") ;  
	  printf(fgGeom->GetName());
	  printf("\n                      you cannot call     "); 
	  printf(name);  
	}else{
	  rv = (AliEMCALGeometry *) fgGeom; 
	} // end if
    }  // end if fgGeom
    return rv; 
}

//______________________________________________________________________
Int_t AliEMCALGeometry::TowerIndex(Int_t ieta,Int_t iphi) const {
  // Returns the tower index number from the based on the Z and Phi
  // index numbers.
  // Inputs:
  //   Int_t ieta    // index along z axis [1-fNZ]
  //   Int_t iphi  // index along phi axis [1-fNPhi]
  // Outputs:
  //   none.
  // Returned
  //   Int_t index // Tower index number 
  
  if ( (ieta <= 0 || ieta>GetNEta()) || 
       (iphi <= 0 || iphi>GetNPhi())) 
    Fatal("TowerIndex", "Unexpected parameters eta = %d phi = %d!", ieta, iphi) ; 
  
  return ( (iphi - 1)*GetNEta() + ieta ); 
}

//______________________________________________________________________
void AliEMCALGeometry::TowerIndexes(Int_t index,Int_t &ieta,Int_t &iphi) const {
  // Inputs:
  //   Int_t index // Tower index number [1-fNZ*fNPhi]
  // Outputs:
  //   Int_t ieta    // index allong z axis [1-fNZ]
  //   Int_t iphi  // index allong phi axis [1-fNPhi]
  // Returned
  //   none.

  Int_t nindex = 0;

  if ( IsInECA(index) ) { // ECAL index
    nindex = index ;
  }
  else 
    Fatal("TowerIndexes", "Unexpected Id number!") ;
   
  if (nindex%GetNZ()) 
    iphi = nindex / GetNZ() + 1 ; 
  else 
    iphi = nindex / GetNZ() ; 
  ieta = nindex - (iphi - 1) * GetNZ() ; 

  if (gDebug==2)
    printf("TowerIndexes: index=%d,%d, ieta=%d, iphi = %d", index, nindex,ieta, iphi) ; 
  return;
  
}

//______________________________________________________________________
void AliEMCALGeometry::EtaPhiFromIndex(Int_t index,Float_t &eta,Float_t &phi) const {
    // given the tower index number it returns the based on the eta and phi
    // of the tower.
    // Inputs:
    //   Int_t index // Tower index number [1-fNZ*fNPhi]
    // Outputs:
    //   Float_t eta  // eta of center of tower in pseudorapidity
    //   Float_t phi  // phi of center of tower in degrees
    // Returned
    //   none.
    Int_t ieta, iphi;
    Float_t deta, dphi ;

    TowerIndexes(index,ieta,iphi);
    
    if (gDebug == 2) 
      printf("EtaPhiFromIndex: index = %d, ieta = %d, iphi = %d", index, ieta, iphi) ;

    deta = (GetArm1EtaMax()-GetArm1EtaMin())/(static_cast<Float_t>(GetNEta()));
    eta  = GetArm1EtaMin() + ((static_cast<Float_t>(ieta) - 0.5 ))*deta;

    dphi = (GetArm1PhiMax() - GetArm1PhiMin())/(static_cast<Float_t>(GetNPhi()));  // in degrees.
    phi  = GetArm1PhiMin() + dphi*(static_cast<Float_t>(iphi) - 0.5);//iphi range [1-fNphi].
}

//______________________________________________________________________
Int_t AliEMCALGeometry::TowerIndexFromEtaPhi(Float_t eta,Float_t phi) const {
    // returns the tower index number based on the eta and phi of the tower.
    // Inputs:
    //   Float_t eta  // eta of center of tower in pseudorapidity
    //   Float_t phi  // phi of center of tower in degrees
    // Outputs:
    //   none.
    // Returned
    //   Int_t index // Tower index number [1-fNZ*fNPhi]

    Int_t ieta,iphi;

    ieta = static_cast<Int_t> ( 1 + (static_cast<Float_t>(GetNEta()) * (eta - GetArm1EtaMin()) / (GetArm1EtaMax() - GetArm1EtaMin())) ) ;

    if( ieta <= 0 || ieta > GetNEta() ) { 
      Error("TowerIndexFromEtaPhi", "Unexpected (eta, phi) = (%f, %f) value, outside of EMCAL!", eta, phi) ; 
      return -1 ; 
    }

    iphi = static_cast<Int_t> ( 1 + (static_cast<Float_t>(GetNPhi()) * (phi - GetArm1PhiMin()) / (GetArm1PhiMax() - GetArm1PhiMin())) ) ;

    if( iphi <= 0 || iphi > GetNPhi() ) { 
      Error("TowerIndexFromEtaPhi", "Unexpected (eta, phi) = (%f, %f) value, outside of EMCAL!", eta, phi) ; 
      return -1 ; 
    }

    return TowerIndex(ieta,iphi);
}

//______________________________________________________________________
Int_t AliEMCALGeometry::PreTowerIndexFromEtaPhi(Float_t eta,Float_t phi) const {
    // returns the pretower index number based on the eta and phi of the tower.
    // Inputs:
    //   Float_t eta  // eta of center of tower in pseudorapidity
    //   Float_t phi  // phi of center of tower in degrees
    // Outputs:
    //   none.
    // Returned
    //   Int_t index // PreTower index number [fNZ*fNPhi-2*fNZ*fNPhi]

    return GetNEta()*GetNPhi()+TowerIndexFromEtaPhi(eta,phi);
}

//______________________________________________________________________
Bool_t AliEMCALGeometry::AbsToRelNumbering(Int_t AbsId, Int_t *relid) const {
    // Converts the absolute numbering into the following array/
    //  relid[0] = EMCAL Arm number 1:1 
    //  relid[1] = Row number inside EMCAL
    //  relid[2] = Column number inside EMCAL
    // Input:
    //   Int_t AbsId // Tower index number [1-2*fNZ*fNPhi]
    // Outputs:
    //   Int_t *relid // array of 3. Discribed above.
    Bool_t rv  = kTRUE ;
    Int_t ieta=0,iphi=0,index=AbsId;

    TowerIndexes(index,ieta,iphi);
    relid[0] = 1;
    relid[1] = ieta;
    relid[2] = iphi;

    return rv;
}

//______________________________________________________________________
void AliEMCALGeometry::PosInAlice(const Int_t *relid, Float_t &theta, Float_t &phi) const 
{
  // Converts the relative numbering into the local EMCAL-module (x, z)
  // coordinates
  Int_t ieta = relid[1]; // offset along x axis
  Int_t iphi = relid[2]; // offset along z axis
  Int_t index;
  Float_t eta;
  
  index = TowerIndex(ieta,iphi);
  EtaPhiFromIndex(index,eta,phi);
  //theta = 180.*(2.0*TMath::ATan(TMath::Exp(-eta)))/TMath::Pi();
  theta = 2.0*TMath::ATan(TMath::Exp(-eta));

  // correct for distance to IP
  Float_t d = GetIP2ECASection() - GetIPDistance() ;  

  Float_t correction = 1 + d/GetIPDistance() ; 
  Float_t tantheta = TMath::Tan(theta) * correction ; 
  theta = TMath::ATan(tantheta) * TMath::RadToDeg() ; 
  if (theta < 0 ) 
    theta += 180. ; 
  
  return;
}

//______________________________________________________________________
void AliEMCALGeometry::PosInAlice(const Int_t absid, Float_t &theta, Float_t &phi) const 
{
  // Converts the relative numbering into the local EMCAL-module (x, z)
  // coordinates
  
  Int_t relid[3] ; 
  AbsToRelNumbering(absid, relid) ;
  Int_t ieta = relid[1]; // offset along x axis
  Int_t iphi = relid[2]; // offset along z axis
  Int_t index;
  Float_t eta;
  
  index = TowerIndex(ieta,iphi);
  EtaPhiFromIndex(index,eta,phi);
  theta = 2.0*TMath::ATan(TMath::Exp(-eta)) ;
  
  // correct for distance to IP
  Float_t d = 0. ; 
  if (IsInECA(absid))
    d = GetIP2ECASection() - GetIPDistance() ; 
  else 
    Fatal("PosInAlice", "Unexpected id # %d!", absid) ; 

  Float_t correction = 1 + d/GetIPDistance() ; 
  Float_t tantheta = TMath::Tan(theta) * correction ; 
  theta = TMath::ATan(tantheta) * TMath::RadToDeg() ; 
  if (theta < 0 ) 
    theta += 180. ; 
  
  return;
}

//______________________________________________________________________
void AliEMCALGeometry::XYZFromIndex(const Int_t *relid,Float_t &x,Float_t &y, Float_t &z) const {
    // given the tower relative number it returns the X, Y and Z
    // of the tower.
    
    // Outputs:
    //   Float_t x  // x of center of tower in cm
    //   Float_t y  // y of center of tower in cm
    //   Float_t z  // z of centre of tower in cm
    // Returned
    //   none.
    
    Float_t eta,theta, phi,cylradius=0. ;
    
    Int_t ieta   = relid[1]; // offset along x axis
    Int_t iphi = relid[2]; // offset along z axis.
    Int_t index;
    
    index = TowerIndex(ieta,iphi);
    EtaPhiFromIndex(index,eta,phi);
    theta = 180.*(2.0*TMath::ATan(TMath::Exp(-eta)))/TMath::Pi();
    
    cylradius = GetIP2ECASection() ;  

    Double_t  kDeg2Rad = TMath::DegToRad() ; 
    x =  cylradius * TMath::Cos(phi * kDeg2Rad ) ;
    y =  cylradius * TMath::Sin(phi * kDeg2Rad ) ; 
    z =  cylradius / TMath::Tan(theta * kDeg2Rad ) ; 
 
 return;
} 

//______________________________________________________________________
void AliEMCALGeometry::XYZFromIndex(const Int_t absid,  TVector3 &v) const {
    // given the tower relative number it returns the X, Y and Z
    // of the tower.
    
    // Outputs:
    //   Float_t x  // x of center of tower in cm
    //   Float_t y  // y of center of tower in cm
    //   Float_t z  // z of centre of tower in cm
    // Returned
    //   none.
    
    Float_t theta, phi,cylradius=0. ;
        
    PosInAlice(absid, theta, phi) ; 
    
    if ( IsInECA(absid) ) 
      cylradius = GetIP2ECASection() ;
    else 
      Fatal("XYZFromIndex", "Unexpected Tower section") ;  

    Double_t  kDeg2Rad = TMath::DegToRad() ; 
    v.SetX(cylradius * TMath::Cos(phi * kDeg2Rad ) );
    v.SetY(cylradius * TMath::Sin(phi * kDeg2Rad ) ); 
    v.SetZ(cylradius / TMath::Tan(theta * kDeg2Rad ) ) ; 
 
 return;
} 

//______________________________________________________________________
/*
Boot_t AliEMCALGeometry::AreNeighbours(Int_t index1,Int_t index2) const {
    // Returns kTRUE if the two towers are neighbours or not, including
    // diagonals. Both indexes are required to be either towers or preshower.
    // Inputs:
    //   Int_t index1  // index of tower 1
    //   Int_t index2  // index of tower 2
    // Outputs:
    //   none.
    // Returned
    //   Boot_t kTRUE if the towers are neighbours otherwise false.
    Boot_t anb = kFALSE;
    Int_t ieta1 = 0, ieta2 = 0, iphi1 = 0, iphi2 = 0;

    TowerIndexes(index1,ieta1,iphi1);
    TowerIndexes(index2,ieta2,iphi2);
    if((ieta1>=ieta2-1 && ieta1<=ieta2+1) && (iphi1>=iphi2-1 &&iphi1<=iphi2+1))
                                                                 anb = kTRUE;
    return anb;
}
 */
Commit	Line	Data
2012850d	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	/* $Id$*/
	17
	18	//_________________________________________________________________________
	19	// Geometry class for EMCAL : singleton
b13bbe81	20	// EMCAL consists of layers of scintillator and lead
ffa6d63b	21	// Places the the Barrel Geometry of The EMCAL at Midrapidity
	22	// between 0 and 120 degrees of Phi and
	23	// -0.7 to 0.7 in eta
	24	// Number of Modules and Layers may be controlled by
	25	// the name of the instance defined
	26	// EMCALArch2x has more modules along both phi and eta
	27	// EMCALArchxa has less Layers in the Radial Direction
b13bbe81	28	//*-- Author: Sahal Yacoob (LBL / UCT)
	29	// and : Yves Schutz (SUBATECH)
	30	// and : Jennifer Klay (LBL)
2012850d	31
2012850d	32	// --- AliRoot header files ---
ca8f5bd0	33	#include <TMath.h>
116cbefd	34	#include <TVector3.h>
173558f2	35
ca8f5bd0	36	// -- ALICE Headers.
d64c959b	37	//#include "AliConst.h"
173558f2	38
ca8f5bd0	39	// --- EMCAL headers
ca8f5bd0	40	#include "AliEMCALGeometry.h"
2012850d	41
b13bbe81	42	ClassImp(AliEMCALGeometry);
2012850d	43
b13bbe81	44	AliEMCALGeometry *AliEMCALGeometry::fgGeom = 0;
b13bbe81	45	Bool_t AliEMCALGeometry::fgInit = kFALSE;
2012850d	46
b13bbe81	47	//______________________________________________________________________
	48	AliEMCALGeometry::~AliEMCALGeometry(void){
	49	// dtor
2012850d	50	}
b13bbe81	51
395c7ba2	52	//______________________________________________________________________
395c7ba2	53	const Bool_t AliEMCALGeometry::AreInSameTower(Int_t id1, Int_t id2) const {
fdebddeb	54	// Find out whether two hits are in the same tower
395c7ba2	55	Int_t idmax = TMath::Max(id1, id2) ;
	56	Int_t idmin = TMath::Min(id1, id2) ;
	57	if ( ((idmax - GetNZ() * GetNPhi()) == idmin ) \|\|
	58	((idmax - 2 * GetNZ() * GetNPhi()) == idmin ) )
	59	return kTRUE ;
	60	else
	61	return kFALSE ;
	62	}
05a92d59	63
395c7ba2	64	//______________________________________________________________________
	65	void AliEMCALGeometry::Init(void){
	66	// Initializes the EMCAL parameters
fdebddeb	67	// naming convention : GUV_WX_N_ gives the composition of a tower
395c7ba2	68	// WX inform about the composition of the EM calorimeter section:
fdebddeb	69	// thickness in mm of Pb radiator (W) and of scintillator (X), and number of scintillator layers (N)
fdebddeb	70	// New geometry: EMCAL_55_25
395c7ba2	71
fdebddeb	72	fgInit = kFALSE; // Assume failed until proven otherwise.
	73	TString name(GetName()) ;
	74	if (name == "EMCAL_55_25") {
	75	fECPbRadThickness = 0.5; // cm, Thickness of the Pb radiators
	76	fECScintThick = 0.5; // cm, Thickness of the scintillator
	77	fNECLayers = 25; // number of scintillator layers
395c7ba2	78
fdebddeb	79	fSampling = 11.8;
395c7ba2	80
fdebddeb	81	fAlFrontThick = 3.5; // cm, Thickness of front Al layer
395c7ba2	82	fGap2Active = 1.0; // cm, Gap between Al and 1st Scintillator
395c7ba2	83	}
fdebddeb	84	else if( name == "G56_2_55_19" \|\| name == "EMCAL_5655_21" \|\| name == "G56_2_55_19_104_14"\|\| name == "G65_2_64_19" \|\| name == "EMCAL_6564_21"){
fdebddeb	85	Fatal("Init", "%s is an old geometry! Please update your Config file", name.Data()) ;
395c7ba2	86	}
	87	else
	88	Fatal("Init", "%s is an undefined geometry!", name.Data()) ;
05a92d59	89
395c7ba2	90	// geometry
fdebddeb	91	fNZ = 114; // granularity along Z (eta)
	92	fNPhi = 168; // granularity in phi (azimuth)
	93	fArm1PhiMin = 60.0; // degrees, Starting EMCAL Phi position
	94	fArm1PhiMax = 180.0; // degrees, Ending EMCAL Phi position
	95	fArm1EtaMin = -0.7; // pseudorapidity, Starting EMCAL Eta position
	96	fArm1EtaMax = +0.7; // pseudorapidity, Ending EMCAL Eta position
395c7ba2	97
395c7ba2	98	fIPDistance = 454.0; // cm, Radial distance to inner surface of EMCAL
fdebddeb	99
	100	//There is always one more scintillator than radiator layer because of the first block of aluminium
	101	fShellThickness = fAlFrontThick + fGap2Active + fNECLayersGetECScintThick()+(fNECLayers-1)GetECPbRadThick();
	102
395c7ba2	103	fZLength = 2.*ZFromEtaR(fIPDistance+fShellThickness,fArm1EtaMax); // Z coverage
	104	fEnvelop[0] = fIPDistance; // mother volume inner radius
	105	fEnvelop[1] = fIPDistance + fShellThickness; // mother volume outer r.
	106	fEnvelop[2] = 1.00001*fZLength; // add some padding for mother volume.
	107
	108	fgInit = kTRUE;
	109
88cb7938	110	if (gDebug) {
fdebddeb	111	printf("Init: geometry of EMCAL named %s is as follows:", name.Data());
88cb7938	112	printf( " ECAL : %d x (%f mm Pb, %f mm Sc) \n", GetNECLayers(), GetECPbRadThick(), GetECScintThick() ) ;
88cb7938	113	printf("Granularity: %d in eta and %d in phi\n", GetNZ(), GetNPhi()) ;
	114	printf("Layout: phi = (%f, %f), eta = (%f, %f), y = %f\n",
	115	GetArm1PhiMin(), GetArm1PhiMax(),GetArm1EtaMin(), GetArm1EtaMax(), GetIPDistance() ) ;
	116	}
2012850d	117	}
173558f2	118
b13bbe81	119	//______________________________________________________________________
b13bbe81	120	AliEMCALGeometry * AliEMCALGeometry::GetInstance(){
05a92d59	121	// Returns the pointer of the unique instance
	122
	123	return static_cast<AliEMCALGeometry *>( fgGeom ) ;
2012850d	124	}
173558f2	125
b13bbe81	126	//______________________________________________________________________
	127	AliEMCALGeometry* AliEMCALGeometry::GetInstance(const Text_t* name,
	128	const Text_t* title){
	129	// Returns the pointer of the unique instance
	130
	131	AliEMCALGeometry * rv = 0;
	132	if ( fgGeom == 0 ) {
	133	if ( strcmp(name,"") == 0 ) rv = 0;
	134	else {
	135	fgGeom = new AliEMCALGeometry(name, title);
	136	if ( fgInit ) rv = (AliEMCALGeometry * ) fgGeom;
	137	else {
	138	rv = 0;
	139	delete fgGeom;
	140	fgGeom = 0;
	141	} // end if fgInit
	142	} // end if strcmp(name,"")
	143	}else{
	144	if ( strcmp(fgGeom->GetName(), name) != 0 ) {
fdebddeb	145	printf("\ncurrent geometry is ") ;
	146	printf(fgGeom->GetName());
	147	printf("\n you cannot call ");
	148	printf(name);
b13bbe81	149	}else{
9859bfc0	150	rv = (AliEMCALGeometry *) fgGeom;
b13bbe81	151	} // end if
	152	} // end if fgGeom
	153	return rv;
2012850d	154	}
173558f2	155
ca8f5bd0	156	//______________________________________________________________________
395c7ba2	157	Int_t AliEMCALGeometry::TowerIndex(Int_t ieta,Int_t iphi) const {
395c7ba2	158	// Returns the tower index number from the based on the Z and Phi
fdebddeb	159	// index numbers.
395c7ba2	160	// Inputs:
fdebddeb	161	// Int_t ieta // index along z axis [1-fNZ]
fdebddeb	162	// Int_t iphi // index along phi axis [1-fNPhi]
395c7ba2	163	// Outputs:
	164	// none.
	165	// Returned
	166	// Int_t index // Tower index number
	167
	168	if ( (ieta <= 0 \|\| ieta>GetNEta()) \|\|
	169	(iphi <= 0 \|\| iphi>GetNPhi()))
	170	Fatal("TowerIndex", "Unexpected parameters eta = %d phi = %d!", ieta, iphi) ;
	171
	172	return ( (iphi - 1)*GetNEta() + ieta );
ca8f5bd0	173	}
173558f2	174
ca8f5bd0	175	//______________________________________________________________________
fdebddeb	176	void AliEMCALGeometry::TowerIndexes(Int_t index,Int_t &ieta,Int_t &iphi) const {
395c7ba2	177	// Inputs:
fdebddeb	178	// Int_t index // Tower index number [1-fNZ*fNPhi]
395c7ba2	179	// Outputs:
	180	// Int_t ieta // index allong z axis [1-fNZ]
	181	// Int_t iphi // index allong phi axis [1-fNPhi]
395c7ba2	182	// Returned
395c7ba2	183	// none.
395c7ba2	184
fdebddeb	185	Int_t nindex = 0;
395c7ba2	186
fdebddeb	187	if ( IsInECA(index) ) { // ECAL index
395c7ba2	188	nindex = index ;
395c7ba2	189	}
	190	else
	191	Fatal("TowerIndexes", "Unexpected Id number!") ;
	192
	193	if (nindex%GetNZ())
	194	iphi = nindex / GetNZ() + 1 ;
	195	else
	196	iphi = nindex / GetNZ() ;
	197	ieta = nindex - (iphi - 1) * GetNZ() ;
	198
	199	if (gDebug==2)
fdebddeb	200	printf("TowerIndexes: index=%d,%d, ieta=%d, iphi = %d", index, nindex,ieta, iphi) ;
395c7ba2	201	return;
395c7ba2	202
ca8f5bd0	203	}
173558f2	204
ca8f5bd0	205	//______________________________________________________________________
a34b7b9f	206	void AliEMCALGeometry::EtaPhiFromIndex(Int_t index,Float_t &eta,Float_t &phi) const {
ca8f5bd0	207	// given the tower index number it returns the based on the eta and phi
	208	// of the tower.
	209	// Inputs:
fdebddeb	210	// Int_t index // Tower index number [1-fNZ*fNPhi]
ca8f5bd0	211	// Outputs:
	212	// Float_t eta // eta of center of tower in pseudorapidity
	213	// Float_t phi // phi of center of tower in degrees
	214	// Returned
	215	// none.
fdebddeb	216	Int_t ieta, iphi;
395c7ba2	217	Float_t deta, dphi ;
ca8f5bd0	218
fdebddeb	219	TowerIndexes(index,ieta,iphi);
395c7ba2	220
395c7ba2	221	if (gDebug == 2)
fdebddeb	222	printf("EtaPhiFromIndex: index = %d, ieta = %d, iphi = %d", index, ieta, iphi) ;
395c7ba2	223
	224	deta = (GetArm1EtaMax()-GetArm1EtaMin())/(static_cast<Float_t>(GetNEta()));
	225	eta = GetArm1EtaMin() + ((static_cast<Float_t>(ieta) - 0.5 ))*deta;
	226
	227	dphi = (GetArm1PhiMax() - GetArm1PhiMin())/(static_cast<Float_t>(GetNPhi())); // in degrees.
	228	phi = GetArm1PhiMin() + dphi*(static_cast<Float_t>(iphi) - 0.5);//iphi range [1-fNphi].
ca8f5bd0	229	}
173558f2	230
ca8f5bd0	231	//______________________________________________________________________
a34b7b9f	232	Int_t AliEMCALGeometry::TowerIndexFromEtaPhi(Float_t eta,Float_t phi) const {
ca8f5bd0	233	// returns the tower index number based on the eta and phi of the tower.
	234	// Inputs:
	235	// Float_t eta // eta of center of tower in pseudorapidity
	236	// Float_t phi // phi of center of tower in degrees
	237	// Outputs:
	238	// none.
	239	// Returned
	240	// Int_t index // Tower index number [1-fNZ*fNPhi]
395c7ba2	241
e908f07f	242	Int_t ieta,iphi;
ca8f5bd0	243
395c7ba2	244	ieta = static_cast<Int_t> ( 1 + (static_cast<Float_t>(GetNEta()) * (eta - GetArm1EtaMin()) / (GetArm1EtaMax() - GetArm1EtaMin())) ) ;
	245
	246	if( ieta <= 0 \|\| ieta > GetNEta() ) {
	247	Error("TowerIndexFromEtaPhi", "Unexpected (eta, phi) = (%f, %f) value, outside of EMCAL!", eta, phi) ;
	248	return -1 ;
	249	}
	250
	251	iphi = static_cast<Int_t> ( 1 + (static_cast<Float_t>(GetNPhi()) * (phi - GetArm1PhiMin()) / (GetArm1PhiMax() - GetArm1PhiMin())) ) ;
	252
	253	if( iphi <= 0 \|\| iphi > GetNPhi() ) {
	254	Error("TowerIndexFromEtaPhi", "Unexpected (eta, phi) = (%f, %f) value, outside of EMCAL!", eta, phi) ;
	255	return -1 ;
	256	}
	257
	258	return TowerIndex(ieta,iphi);
ca8f5bd0	259	}
173558f2	260
ca8f5bd0	261	//______________________________________________________________________
a34b7b9f	262	Int_t AliEMCALGeometry::PreTowerIndexFromEtaPhi(Float_t eta,Float_t phi) const {
ca8f5bd0	263	// returns the pretower index number based on the eta and phi of the tower.
	264	// Inputs:
	265	// Float_t eta // eta of center of tower in pseudorapidity
	266	// Float_t phi // phi of center of tower in degrees
	267	// Outputs:
	268	// none.
	269	// Returned
	270	// Int_t index // PreTower index number [fNZfNPhi-2fNZ*fNPhi]
	271
e908f07f	272	return GetNEta()*GetNPhi()+TowerIndexFromEtaPhi(eta,phi);
ca8f5bd0	273	}
173558f2	274
ca8f5bd0	275	//______________________________________________________________________
a34b7b9f	276	Bool_t AliEMCALGeometry::AbsToRelNumbering(Int_t AbsId, Int_t *relid) const {
ca8f5bd0	277	// Converts the absolute numbering into the following array/
5a9318ff	278	// relid[0] = EMCAL Arm number 1:1
fdebddeb	279	// relid[1] = Row number inside EMCAL
fdebddeb	280	// relid[2] = Column number inside EMCAL
ca8f5bd0	281	// Input:
	282	// Int_t AbsId // Tower index number [1-2fNZfNPhi]
	283	// Outputs:
fdebddeb	284	// Int_t *relid // array of 3. Discribed above.
ca8f5bd0	285	Bool_t rv = kTRUE ;
fdebddeb	286	Int_t ieta=0,iphi=0,index=AbsId;
ca8f5bd0	287
fdebddeb	288	TowerIndexes(index,ieta,iphi);
ca8f5bd0	289	relid[0] = 1;
fdebddeb	290	relid[1] = ieta;
fdebddeb	291	relid[2] = iphi;
ca8f5bd0	292
	293	return rv;
	294	}
173558f2	295
ca8f5bd0	296	//______________________________________________________________________
395c7ba2	297	void AliEMCALGeometry::PosInAlice(const Int_t *relid, Float_t &theta, Float_t &phi) const
	298	{
	299	// Converts the relative numbering into the local EMCAL-module (x, z)
	300	// coordinates
fdebddeb	301	Int_t ieta = relid[1]; // offset along x axis
fdebddeb	302	Int_t iphi = relid[2]; // offset along z axis
395c7ba2	303	Int_t index;
	304	Float_t eta;
	305
	306	index = TowerIndex(ieta,iphi);
	307	EtaPhiFromIndex(index,eta,phi);
fdebddeb	308	//theta = 180.(2.0TMath::ATan(TMath::Exp(-eta)))/TMath::Pi();
fdebddeb	309	theta = 2.0*TMath::ATan(TMath::Exp(-eta));
395c7ba2	310
fdebddeb	311	// correct for distance to IP
fdebddeb	312	Float_t d = GetIP2ECASection() - GetIPDistance() ;
395c7ba2	313
	314	Float_t correction = 1 + d/GetIPDistance() ;
	315	Float_t tantheta = TMath::Tan(theta) * correction ;
	316	theta = TMath::ATan(tantheta) * TMath::RadToDeg() ;
	317	if (theta < 0 )
	318	theta += 180. ;
	319
	320	return;
	321	}
ca8f5bd0	322
395c7ba2	323	//______________________________________________________________________
	324	void AliEMCALGeometry::PosInAlice(const Int_t absid, Float_t &theta, Float_t &phi) const
	325	{
	326	// Converts the relative numbering into the local EMCAL-module (x, z)
	327	// coordinates
	328
fdebddeb	329	Int_t relid[3] ;
395c7ba2	330	AbsToRelNumbering(absid, relid) ;
fdebddeb	331	Int_t ieta = relid[1]; // offset along x axis
fdebddeb	332	Int_t iphi = relid[2]; // offset along z axis
395c7ba2	333	Int_t index;
	334	Float_t eta;
	335
	336	index = TowerIndex(ieta,iphi);
	337	EtaPhiFromIndex(index,eta,phi);
	338	theta = 2.0*TMath::ATan(TMath::Exp(-eta)) ;
	339
fdebddeb	340	// correct for distance to IP
395c7ba2	341	Float_t d = 0. ;
fdebddeb	342	if (IsInECA(absid))
88cb7938	343	d = GetIP2ECASection() - GetIPDistance() ;
395c7ba2	344	else
	345	Fatal("PosInAlice", "Unexpected id # %d!", absid) ;
	346
	347	Float_t correction = 1 + d/GetIPDistance() ;
	348	Float_t tantheta = TMath::Tan(theta) * correction ;
	349	theta = TMath::ATan(tantheta) * TMath::RadToDeg() ;
	350	if (theta < 0 )
	351	theta += 180. ;
	352
	353	return;
ca8f5bd0	354	}
6119e5db	355
	356	//______________________________________________________________________
	357	void AliEMCALGeometry::XYZFromIndex(const Int_t *relid,Float_t &x,Float_t &y, Float_t &z) const {
	358	// given the tower relative number it returns the X, Y and Z
	359	// of the tower.
	360
	361	// Outputs:
	362	// Float_t x // x of center of tower in cm
	363	// Float_t y // y of center of tower in cm
	364	// Float_t z // z of centre of tower in cm
	365	// Returned
	366	// none.
	367
fdebddeb	368	Float_t eta,theta, phi,cylradius=0. ;
6119e5db	369
fdebddeb	370	Int_t ieta = relid[1]; // offset along x axis
fdebddeb	371	Int_t iphi = relid[2]; // offset along z axis.
6119e5db	372	Int_t index;
6119e5db	373
395c7ba2	374	index = TowerIndex(ieta,iphi);
6119e5db	375	EtaPhiFromIndex(index,eta,phi);
6119e5db	376	theta = 180.(2.0TMath::ATan(TMath::Exp(-eta)))/TMath::Pi();
6119e5db	377
fdebddeb	378	cylradius = GetIP2ECASection() ;
a97849a9	379
395c7ba2	380	Double_t kDeg2Rad = TMath::DegToRad() ;
fdebddeb	381	x = cylradius * TMath::Cos(phi * kDeg2Rad ) ;
	382	y = cylradius * TMath::Sin(phi * kDeg2Rad ) ;
	383	z = cylradius / TMath::Tan(theta * kDeg2Rad ) ;
6119e5db	384
	385	return;
	386	}
	387
395c7ba2	388	//______________________________________________________________________
	389	void AliEMCALGeometry::XYZFromIndex(const Int_t absid, TVector3 &v) const {
	390	// given the tower relative number it returns the X, Y and Z
	391	// of the tower.
	392
	393	// Outputs:
	394	// Float_t x // x of center of tower in cm
	395	// Float_t y // y of center of tower in cm
	396	// Float_t z // z of centre of tower in cm
	397	// Returned
	398	// none.
	399
fdebddeb	400	Float_t theta, phi,cylradius=0. ;
395c7ba2	401
	402	PosInAlice(absid, theta, phi) ;
	403
88cb7938	404	if ( IsInECA(absid) )
fdebddeb	405	cylradius = GetIP2ECASection() ;
395c7ba2	406	else
	407	Fatal("XYZFromIndex", "Unexpected Tower section") ;
	408
	409	Double_t kDeg2Rad = TMath::DegToRad() ;
fdebddeb	410	v.SetX(cylradius * TMath::Cos(phi * kDeg2Rad ) );
	411	v.SetY(cylradius * TMath::Sin(phi * kDeg2Rad ) );
	412	v.SetZ(cylradius / TMath::Tan(theta * kDeg2Rad ) ) ;
395c7ba2	413
	414	return;
	415	}
	416
ca8f5bd0	417	//______________________________________________________________________
ca8f5bd0	418	/*
a34b7b9f	419	Boot_t AliEMCALGeometry::AreNeighbours(Int_t index1,Int_t index2) const {
ca8f5bd0	420	// Returns kTRUE if the two towers are neighbours or not, including
	421	// diagonals. Both indexes are required to be either towers or preshower.
	422	// Inputs:
	423	// Int_t index1 // index of tower 1
	424	// Int_t index2 // index of tower 2
	425	// Outputs:
	426	// none.
	427	// Returned
	428	// Boot_t kTRUE if the towers are neighbours otherwise false.
	429	Boot_t anb = kFALSE;
fdebddeb	430	Int_t ieta1 = 0, ieta2 = 0, iphi1 = 0, iphi2 = 0;
ca8f5bd0	431
fdebddeb	432	TowerIndexes(index1,ieta1,iphi1);
fdebddeb	433	TowerIndexes(index2,ieta2,iphi2);
e908f07f	434	if((ieta1>=ieta2-1 && ieta1<=ieta2+1) && (iphi1>=iphi2-1 &&iphi1<=iphi2+1))
ca8f5bd0	435	anb = kTRUE;
	436	return anb;
	437	}
	438	*/