[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               
//*-- 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
}

//______________________________________________________________________
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);
}

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

    TowerIndexes(index,ieta,iphi);
    relid[0] = ieta;
    relid[1] = 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[0]; // offset along x axis
  Int_t iphi = relid[1]; // 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(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[2] ; 
  AbsToRelNumbering(absid, relid) ;
  Int_t ieta = relid[0]; // offset along x axis
  Int_t iphi = relid[1]; // 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[0]; // offset along x axis
    Int_t iphi = relid[1]; // 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(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;
}
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
b13bbe81	26	//*-- Author: Sahal Yacoob (LBL / UCT)
	27	// and : Yves Schutz (SUBATECH)
	28	// and : Jennifer Klay (LBL)
2012850d	29
2012850d	30	// --- AliRoot header files ---
ca8f5bd0	31	#include <TMath.h>
116cbefd	32	#include <TVector3.h>
173558f2	33
ca8f5bd0	34	// -- ALICE Headers.
d64c959b	35	//#include "AliConst.h"
173558f2	36
ca8f5bd0	37	// --- EMCAL headers
ca8f5bd0	38	#include "AliEMCALGeometry.h"
2012850d	39
b13bbe81	40	ClassImp(AliEMCALGeometry);
2012850d	41
b13bbe81	42	AliEMCALGeometry *AliEMCALGeometry::fgGeom = 0;
b13bbe81	43	Bool_t AliEMCALGeometry::fgInit = kFALSE;
2012850d	44
b13bbe81	45	//______________________________________________________________________
	46	AliEMCALGeometry::~AliEMCALGeometry(void){
	47	// dtor
2012850d	48	}
b13bbe81	49
395c7ba2	50	//______________________________________________________________________
09884213	51	Bool_t AliEMCALGeometry::AreInSameTower(Int_t id1, Int_t id2) const {
fdebddeb	52	// Find out whether two hits are in the same tower
395c7ba2	53	Int_t idmax = TMath::Max(id1, id2) ;
	54	Int_t idmin = TMath::Min(id1, id2) ;
	55	if ( ((idmax - GetNZ() * GetNPhi()) == idmin ) \|\|
	56	((idmax - 2 * GetNZ() * GetNPhi()) == idmin ) )
	57	return kTRUE ;
	58	else
	59	return kFALSE ;
	60	}
05a92d59	61
395c7ba2	62	//______________________________________________________________________
	63	void AliEMCALGeometry::Init(void){
	64	// Initializes the EMCAL parameters
fdebddeb	65	// naming convention : GUV_WX_N_ gives the composition of a tower
395c7ba2	66	// WX inform about the composition of the EM calorimeter section:
fdebddeb	67	// thickness in mm of Pb radiator (W) and of scintillator (X), and number of scintillator layers (N)
fdebddeb	68	// New geometry: EMCAL_55_25
395c7ba2	69
fdebddeb	70	fgInit = kFALSE; // Assume failed until proven otherwise.
	71	TString name(GetName()) ;
	72	if (name == "EMCAL_55_25") {
	73	fECPbRadThickness = 0.5; // cm, Thickness of the Pb radiators
	74	fECScintThick = 0.5; // cm, Thickness of the scintillator
	75	fNECLayers = 25; // number of scintillator layers
395c7ba2	76
fdebddeb	77	fSampling = 11.8;
395c7ba2	78
fdebddeb	79	fAlFrontThick = 3.5; // cm, Thickness of front Al layer
395c7ba2	80	fGap2Active = 1.0; // cm, Gap between Al and 1st Scintillator
395c7ba2	81	}
fdebddeb	82	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	83	Fatal("Init", "%s is an old geometry! Please update your Config file", name.Data()) ;
395c7ba2	84	}
	85	else
	86	Fatal("Init", "%s is an undefined geometry!", name.Data()) ;
05a92d59	87
395c7ba2	88	// geometry
fdebddeb	89	fNZ = 114; // granularity along Z (eta)
	90	fNPhi = 168; // granularity in phi (azimuth)
	91	fArm1PhiMin = 60.0; // degrees, Starting EMCAL Phi position
	92	fArm1PhiMax = 180.0; // degrees, Ending EMCAL Phi position
	93	fArm1EtaMin = -0.7; // pseudorapidity, Starting EMCAL Eta position
	94	fArm1EtaMax = +0.7; // pseudorapidity, Ending EMCAL Eta position
395c7ba2	95
395c7ba2	96	fIPDistance = 454.0; // cm, Radial distance to inner surface of EMCAL
fdebddeb	97
	98	//There is always one more scintillator than radiator layer because of the first block of aluminium
	99	fShellThickness = fAlFrontThick + fGap2Active + fNECLayersGetECScintThick()+(fNECLayers-1)GetECPbRadThick();
	100
395c7ba2	101	fZLength = 2.*ZFromEtaR(fIPDistance+fShellThickness,fArm1EtaMax); // Z coverage
	102	fEnvelop[0] = fIPDistance; // mother volume inner radius
	103	fEnvelop[1] = fIPDistance + fShellThickness; // mother volume outer r.
	104	fEnvelop[2] = 1.00001*fZLength; // add some padding for mother volume.
	105
	106	fgInit = kTRUE;
	107
88cb7938	108	if (gDebug) {
fdebddeb	109	printf("Init: geometry of EMCAL named %s is as follows:", name.Data());
88cb7938	110	printf( " ECAL : %d x (%f mm Pb, %f mm Sc) \n", GetNECLayers(), GetECPbRadThick(), GetECScintThick() ) ;
88cb7938	111	printf("Granularity: %d in eta and %d in phi\n", GetNZ(), GetNPhi()) ;
	112	printf("Layout: phi = (%f, %f), eta = (%f, %f), y = %f\n",
	113	GetArm1PhiMin(), GetArm1PhiMax(),GetArm1EtaMin(), GetArm1EtaMax(), GetIPDistance() ) ;
	114	}
2012850d	115	}
173558f2	116
b13bbe81	117	//______________________________________________________________________
b13bbe81	118	AliEMCALGeometry * AliEMCALGeometry::GetInstance(){
05a92d59	119	// Returns the pointer of the unique instance
	120
	121	return static_cast<AliEMCALGeometry *>( fgGeom ) ;
2012850d	122	}
173558f2	123
b13bbe81	124	//______________________________________________________________________
	125	AliEMCALGeometry* AliEMCALGeometry::GetInstance(const Text_t* name,
	126	const Text_t* title){
	127	// Returns the pointer of the unique instance
	128
	129	AliEMCALGeometry * rv = 0;
	130	if ( fgGeom == 0 ) {
	131	if ( strcmp(name,"") == 0 ) rv = 0;
	132	else {
	133	fgGeom = new AliEMCALGeometry(name, title);
	134	if ( fgInit ) rv = (AliEMCALGeometry * ) fgGeom;
	135	else {
	136	rv = 0;
	137	delete fgGeom;
	138	fgGeom = 0;
	139	} // end if fgInit
	140	} // end if strcmp(name,"")
	141	}else{
	142	if ( strcmp(fgGeom->GetName(), name) != 0 ) {
fdebddeb	143	printf("\ncurrent geometry is ") ;
	144	printf(fgGeom->GetName());
	145	printf("\n you cannot call ");
	146	printf(name);
b13bbe81	147	}else{
9859bfc0	148	rv = (AliEMCALGeometry *) fgGeom;
b13bbe81	149	} // end if
	150	} // end if fgGeom
	151	return rv;
2012850d	152	}
173558f2	153
ca8f5bd0	154	//______________________________________________________________________
395c7ba2	155	Int_t AliEMCALGeometry::TowerIndex(Int_t ieta,Int_t iphi) const {
395c7ba2	156	// Returns the tower index number from the based on the Z and Phi
fdebddeb	157	// index numbers.
395c7ba2	158	// Inputs:
fdebddeb	159	// Int_t ieta // index along z axis [1-fNZ]
fdebddeb	160	// Int_t iphi // index along phi axis [1-fNPhi]
395c7ba2	161	// Outputs:
	162	// none.
	163	// Returned
	164	// Int_t index // Tower index number
	165
	166	if ( (ieta <= 0 \|\| ieta>GetNEta()) \|\|
	167	(iphi <= 0 \|\| iphi>GetNPhi()))
	168	Fatal("TowerIndex", "Unexpected parameters eta = %d phi = %d!", ieta, iphi) ;
	169
	170	return ( (iphi - 1)*GetNEta() + ieta );
ca8f5bd0	171	}
173558f2	172
ca8f5bd0	173	//______________________________________________________________________
fdebddeb	174	void AliEMCALGeometry::TowerIndexes(Int_t index,Int_t &ieta,Int_t &iphi) const {
395c7ba2	175	// Inputs:
fdebddeb	176	// Int_t index // Tower index number [1-fNZ*fNPhi]
395c7ba2	177	// Outputs:
	178	// Int_t ieta // index allong z axis [1-fNZ]
	179	// Int_t iphi // index allong phi axis [1-fNPhi]
395c7ba2	180	// Returned
395c7ba2	181	// none.
395c7ba2	182
fdebddeb	183	Int_t nindex = 0;
395c7ba2	184
fdebddeb	185	if ( IsInECA(index) ) { // ECAL index
395c7ba2	186	nindex = index ;
395c7ba2	187	}
	188	else
	189	Fatal("TowerIndexes", "Unexpected Id number!") ;
	190
	191	if (nindex%GetNZ())
	192	iphi = nindex / GetNZ() + 1 ;
	193	else
	194	iphi = nindex / GetNZ() ;
	195	ieta = nindex - (iphi - 1) * GetNZ() ;
	196
	197	if (gDebug==2)
fdebddeb	198	printf("TowerIndexes: index=%d,%d, ieta=%d, iphi = %d", index, nindex,ieta, iphi) ;
395c7ba2	199	return;
395c7ba2	200
ca8f5bd0	201	}
173558f2	202
ca8f5bd0	203	//______________________________________________________________________
a34b7b9f	204	void AliEMCALGeometry::EtaPhiFromIndex(Int_t index,Float_t &eta,Float_t &phi) const {
ca8f5bd0	205	// given the tower index number it returns the based on the eta and phi
	206	// of the tower.
	207	// Inputs:
fdebddeb	208	// Int_t index // Tower index number [1-fNZ*fNPhi]
ca8f5bd0	209	// Outputs:
	210	// Float_t eta // eta of center of tower in pseudorapidity
	211	// Float_t phi // phi of center of tower in degrees
	212	// Returned
	213	// none.
fdebddeb	214	Int_t ieta, iphi;
395c7ba2	215	Float_t deta, dphi ;
ca8f5bd0	216
fdebddeb	217	TowerIndexes(index,ieta,iphi);
395c7ba2	218
395c7ba2	219	if (gDebug == 2)
fdebddeb	220	printf("EtaPhiFromIndex: index = %d, ieta = %d, iphi = %d", index, ieta, iphi) ;
395c7ba2	221
	222	deta = (GetArm1EtaMax()-GetArm1EtaMin())/(static_cast<Float_t>(GetNEta()));
	223	eta = GetArm1EtaMin() + ((static_cast<Float_t>(ieta) - 0.5 ))*deta;
	224
	225	dphi = (GetArm1PhiMax() - GetArm1PhiMin())/(static_cast<Float_t>(GetNPhi())); // in degrees.
	226	phi = GetArm1PhiMin() + dphi*(static_cast<Float_t>(iphi) - 0.5);//iphi range [1-fNphi].
ca8f5bd0	227	}
173558f2	228
ca8f5bd0	229	//______________________________________________________________________
a34b7b9f	230	Int_t AliEMCALGeometry::TowerIndexFromEtaPhi(Float_t eta,Float_t phi) const {
ca8f5bd0	231	// returns the tower index number based on the eta and phi of the tower.
	232	// Inputs:
	233	// Float_t eta // eta of center of tower in pseudorapidity
	234	// Float_t phi // phi of center of tower in degrees
	235	// Outputs:
	236	// none.
	237	// Returned
	238	// Int_t index // Tower index number [1-fNZ*fNPhi]
395c7ba2	239
e908f07f	240	Int_t ieta,iphi;
ca8f5bd0	241
395c7ba2	242	ieta = static_cast<Int_t> ( 1 + (static_cast<Float_t>(GetNEta()) * (eta - GetArm1EtaMin()) / (GetArm1EtaMax() - GetArm1EtaMin())) ) ;
	243
	244	if( ieta <= 0 \|\| ieta > GetNEta() ) {
	245	Error("TowerIndexFromEtaPhi", "Unexpected (eta, phi) = (%f, %f) value, outside of EMCAL!", eta, phi) ;
	246	return -1 ;
	247	}
	248
	249	iphi = static_cast<Int_t> ( 1 + (static_cast<Float_t>(GetNPhi()) * (phi - GetArm1PhiMin()) / (GetArm1PhiMax() - GetArm1PhiMin())) ) ;
	250
	251	if( iphi <= 0 \|\| iphi > GetNPhi() ) {
	252	Error("TowerIndexFromEtaPhi", "Unexpected (eta, phi) = (%f, %f) value, outside of EMCAL!", eta, phi) ;
	253	return -1 ;
	254	}
	255
	256	return TowerIndex(ieta,iphi);
ca8f5bd0	257	}
173558f2	258
ca8f5bd0	259	//______________________________________________________________________
a34b7b9f	260	Bool_t AliEMCALGeometry::AbsToRelNumbering(Int_t AbsId, Int_t *relid) const {
ca8f5bd0	261	// Converts the absolute numbering into the following array/
2608a1fc	262	// relid[0] = Row number inside EMCAL
2608a1fc	263	// relid[1] = Column number inside EMCAL
ca8f5bd0	264	// Input:
	265	// Int_t AbsId // Tower index number [1-2fNZfNPhi]
	266	// Outputs:
2608a1fc	267	// Int_t *relid // array of 2. Described above.
ca8f5bd0	268	Bool_t rv = kTRUE ;
fdebddeb	269	Int_t ieta=0,iphi=0,index=AbsId;
ca8f5bd0	270
fdebddeb	271	TowerIndexes(index,ieta,iphi);
2608a1fc	272	relid[0] = ieta;
2608a1fc	273	relid[1] = iphi;
ca8f5bd0	274
	275	return rv;
	276	}
173558f2	277
ca8f5bd0	278	//______________________________________________________________________
395c7ba2	279	void AliEMCALGeometry::PosInAlice(const Int_t *relid, Float_t &theta, Float_t &phi) const
	280	{
	281	// Converts the relative numbering into the local EMCAL-module (x, z)
	282	// coordinates
2608a1fc	283	Int_t ieta = relid[0]; // offset along x axis
2608a1fc	284	Int_t iphi = relid[1]; // offset along z axis
395c7ba2	285	Int_t index;
	286	Float_t eta;
	287
	288	index = TowerIndex(ieta,iphi);
	289	EtaPhiFromIndex(index,eta,phi);
fdebddeb	290	//theta = 180.(2.0TMath::ATan(TMath::Exp(-eta)))/TMath::Pi();
fdebddeb	291	theta = 2.0*TMath::ATan(TMath::Exp(-eta));
395c7ba2	292
fdebddeb	293	// correct for distance to IP
fdebddeb	294	Float_t d = GetIP2ECASection() - GetIPDistance() ;
395c7ba2	295
	296	Float_t correction = 1 + d/GetIPDistance() ;
	297	Float_t tantheta = TMath::Tan(theta) * correction ;
	298	theta = TMath::ATan(tantheta) * TMath::RadToDeg() ;
	299	if (theta < 0 )
	300	theta += 180. ;
	301
	302	return;
	303	}
ca8f5bd0	304
395c7ba2	305	//______________________________________________________________________
09884213	306	void AliEMCALGeometry::PosInAlice(Int_t absid, Float_t &theta, Float_t &phi) const
395c7ba2	307	{
	308	// Converts the relative numbering into the local EMCAL-module (x, z)
	309	// coordinates
2608a1fc	310	Int_t relid[2] ;
395c7ba2	311	AbsToRelNumbering(absid, relid) ;
2608a1fc	312	Int_t ieta = relid[0]; // offset along x axis
2608a1fc	313	Int_t iphi = relid[1]; // offset along z axis
395c7ba2	314	Int_t index;
	315	Float_t eta;
	316
	317	index = TowerIndex(ieta,iphi);
	318	EtaPhiFromIndex(index,eta,phi);
	319	theta = 2.0*TMath::ATan(TMath::Exp(-eta)) ;
	320
fdebddeb	321	// correct for distance to IP
395c7ba2	322	Float_t d = 0. ;
fdebddeb	323	if (IsInECA(absid))
88cb7938	324	d = GetIP2ECASection() - GetIPDistance() ;
395c7ba2	325	else
	326	Fatal("PosInAlice", "Unexpected id # %d!", absid) ;
	327
	328	Float_t correction = 1 + d/GetIPDistance() ;
	329	Float_t tantheta = TMath::Tan(theta) * correction ;
	330	theta = TMath::ATan(tantheta) * TMath::RadToDeg() ;
	331	if (theta < 0 )
	332	theta += 180. ;
	333
	334	return;
ca8f5bd0	335	}
6119e5db	336
	337	//______________________________________________________________________
	338	void AliEMCALGeometry::XYZFromIndex(const Int_t *relid,Float_t &x,Float_t &y, Float_t &z) const {
	339	// given the tower relative number it returns the X, Y and Z
	340	// of the tower.
	341
	342	// Outputs:
	343	// Float_t x // x of center of tower in cm
	344	// Float_t y // y of center of tower in cm
	345	// Float_t z // z of centre of tower in cm
	346	// Returned
	347	// none.
	348
fdebddeb	349	Float_t eta,theta, phi,cylradius=0. ;
6119e5db	350
2608a1fc	351	Int_t ieta = relid[0]; // offset along x axis
2608a1fc	352	Int_t iphi = relid[1]; // offset along z axis.
6119e5db	353	Int_t index;
6119e5db	354
395c7ba2	355	index = TowerIndex(ieta,iphi);
6119e5db	356	EtaPhiFromIndex(index,eta,phi);
6119e5db	357	theta = 180.(2.0TMath::ATan(TMath::Exp(-eta)))/TMath::Pi();
6119e5db	358
fdebddeb	359	cylradius = GetIP2ECASection() ;
a97849a9	360
395c7ba2	361	Double_t kDeg2Rad = TMath::DegToRad() ;
fdebddeb	362	x = cylradius * TMath::Cos(phi * kDeg2Rad ) ;
	363	y = cylradius * TMath::Sin(phi * kDeg2Rad ) ;
	364	z = cylradius / TMath::Tan(theta * kDeg2Rad ) ;
6119e5db	365
	366	return;
	367	}
	368
395c7ba2	369	//______________________________________________________________________
09884213	370	void AliEMCALGeometry::XYZFromIndex(Int_t absid, TVector3 &v) const {
395c7ba2	371	// given the tower relative number it returns the X, Y and Z
	372	// of the tower.
	373
	374	// Outputs:
	375	// Float_t x // x of center of tower in cm
	376	// Float_t y // y of center of tower in cm
	377	// Float_t z // z of centre of tower in cm
	378	// Returned
	379	// none.
	380
fdebddeb	381	Float_t theta, phi,cylradius=0. ;
395c7ba2	382
	383	PosInAlice(absid, theta, phi) ;
	384
88cb7938	385	if ( IsInECA(absid) )
fdebddeb	386	cylradius = GetIP2ECASection() ;
395c7ba2	387	else
	388	Fatal("XYZFromIndex", "Unexpected Tower section") ;
	389
	390	Double_t kDeg2Rad = TMath::DegToRad() ;
fdebddeb	391	v.SetX(cylradius * TMath::Cos(phi * kDeg2Rad ) );
	392	v.SetY(cylradius * TMath::Sin(phi * kDeg2Rad ) );
	393	v.SetZ(cylradius / TMath::Tan(theta * kDeg2Rad ) ) ;
395c7ba2	394
	395	return;
	396	}