//_________________________________________________________________________
// Geometry class for EMCAL : singleton
-// EMCAL consists of a shell of Pb
-//
-//*-- Author: Yves Schutz (SUBATECH)
+// 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)
// --- ROOT system ---
// --- Standard library ---
-
-#include <iostream.h>
+#include <stdlib.h>
// --- AliRoot header files ---
+#include <TMath.h>
-#include "AliEMCALGeometry.h"
+// -- ALICE Headers.
#include "AliConst.h"
-ClassImp(AliEMCALGeometry) ;
+// --- EMCAL headers
+#include "AliEMCALGeometry.h"
-AliEMCALGeometry * AliEMCALGeometry::fgGeom = 0 ;
-Bool_t AliEMCALGeometry::fgInit = kFALSE ;
+ClassImp(AliEMCALGeometry);
-//____________________________________________________________________________
-AliEMCALGeometry::~AliEMCALGeometry(void)
-{
- // dtor
+AliEMCALGeometry *AliEMCALGeometry::fgGeom = 0;
+Bool_t AliEMCALGeometry::fgInit = kFALSE;
+//______________________________________________________________________
+AliEMCALGeometry::~AliEMCALGeometry(void){
+ // dtor
}
+//______________________________________________________________________
+void AliEMCALGeometry::Init(void){
+ // Initializes the EMCAL parameters
-//____________________________________________________________________________
-
-void AliEMCALGeometry::Init(void)
-{
- // Initializes the EMCAL parameters
-
- fgInit = kTRUE ;
-
- // geometry
- fAirGap = 5.0 ;
- fArm1PhiMin = 130.0 ;
- fArm1PhiMax = 210.0 ;
- fArm2PhiMin = 330.0 ;
- fArm2PhiMax = 410.0 ;
- fIPDistance = 423.0 ;
- fShellThickness = 50.0 ;
- fZLength = 817.0 ;
- fEnvelop[0] = fIPDistance ;
- fEnvelop[1] = fIPDistance + fShellThickness ;
- fEnvelop[2] = fZLength ;
- fGap2Active = 1.0 ;
- // material
- fAmat = 207.2;
- fZmat = 82.;
- fDmat = 5.798167 ;
- fRmat = 1.261061;
- fEmat = 23 ;
-
+ fgInit = kFALSE; // Assume failer untill proven otherwise.
+
+ TString name(GetName()) ;
+
+ if( name != "EMCALArch1a" &&
+ name != "EMCALArch1b" &&
+ name != "EMCALArch2a" &&
+ name != "EMCALArch2b" ){
+ Fatal("Init", "%s is not a known geometry (choose among EMCALArch1a, EMCALArch1b, EMCALArch2a and EMCALArch2b)", name.Data()) ;
+ } // end if
+ //
+ if ( name == "EMCALArch1a" ||
+ name == "EMCALArch1b" ) {
+ fNZ = 96;
+ fNPhi = 144;
+ } // end if
+ if ( name == "EMCALArch2a" ||
+ name, "EMCALArch2b" ) {
+ fNZ = 112;
+ fNPhi = 168;
+ } // end if
+ if ( name == "EMCALArch1a" ||
+ name == "EMCALArch2a" ) {
+ fNLayers = 21;
+ } // end if
+ if ( name == "EMCALArch1b" ||
+ name == "EMCALArch2b" ) {
+ fNLayers = 25;
+ } // end if
+
+ // geometry
+ fAirGap = 5.0; // cm, air gap between EMCAL mother volume and
+ // active material.
+ fAlFrontThick = 3.18; // cm, Thickness of front Al layer
+ fPbRadThickness = 0.5; // cm, Thickness of theh Pb radiators.
+ fPreShowerSintThick = 0.6; // cm, Thickness of the sintilator for the
+ // preshower part of the calorimeter
+ fFullShowerSintThick = 0.5; // cm, Thickness of the sintilator for the
+ // full shower part of the calorimeter
+ 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
+ fShellThickness = GetAlFrontThickness() + 2.*GetPreSintThick() +
+ (fNLayers-2)*GetFullSintThick()+(fNLayers-1)*GetPbRadThick();
+ //below; cm, Z lenght of the EMCAL.
+ fZLength = 2.*ZFromEtaR(fIPDistance+fShellThickness,fArm1EtaMax);
+ 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.
+ fGap2Active = 1.0; // cm, Gap between
+ fgInit = kTRUE;
}
-//____________________________________________________________________________
-AliEMCALGeometry * AliEMCALGeometry::GetInstance()
-{
+//______________________________________________________________________
+AliEMCALGeometry * AliEMCALGeometry::GetInstance(){
// Returns the pointer of the unique instance
- return (AliEMCALGeometry *) fgGeom ;
+
+ 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 ;
- }
- }
- }
- else {
- if ( strcmp(fgGeom->GetName(), name) != 0 ) {
- cout << "AliEMCALGeometry <E> : current geometry is " << fgGeom->GetName() << endl
- << " you cannot call " << name << endl ;
- }
- else
- rv = (AliEMCALGeometry *) fgGeom ;
- }
- return rv ;
+//______________________________________________________________________
+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 ) {
+ TString message("\n") ;
+ message += "current geometry is " ;
+ message += fgGeom->GetName() ;
+ message += "\n you cannot call " ;
+ message += name ;
+ ::Info("GetGeometry", message.Data() ) ;
+ }else{
+ rv = (AliEMCALGeometry *) fgGeom;
+ } // end if
+ } // end if fgGeom
+ return rv;
+}
+
+//______________________________________________________________________
+Int_t AliEMCALGeometry::TowerIndex(Int_t ieta,Int_t iphi,Int_t ipre) const {
+ // Returns the tower index number from the based on the Z and Phi
+ // index numbers. There are 2 times the number of towers to separate
+ // out the full towsers from the pre-towsers.
+ // Inputs:
+ // Int_t ieta // index allong z axis [1-fNZ]
+ // Int_t iphi // index allong phi axis [1-fNPhi]
+ // Int_t ipre // 0 = Full tower, 1 = Pre-shower tower only. [0,1]
+ // Outputs:
+ // none.
+ // Returned
+ // Int_t the absoulute tower index. [1-2*fNZ*fNPhi]
+ Int_t index;
+
+ if((ieta<=0 || ieta>GetNEta()) || (iphi<=0 || iphi>GetNPhi()) ||
+ (ipre<0 || ipre>1) ){
+ TString message ("\n") ;
+ message += "inputs out of range ieta= " ;
+ message += ieta ;
+ message += " [1-" ;
+ message += GetNEta() ;
+ message += "] iphi= " ;
+ message += iphi ;
+ message += " [1-" ;
+ message += GetNPhi() ;
+ message += "] ipre= " ;
+ message += ipre ;
+ message += "[0,1]. returning -1" ;
+ Warning("TowerIndex", message.Data() ) ;
+ return -1;
+ } // end if
+ index = iphi + GetNPhi()*(ieta-1) + ipre*(GetNPhi()*GetNEta());
+ return index;
+}
+
+//______________________________________________________________________
+void AliEMCALGeometry::TowerIndexes(Int_t index,Int_t &ieta,Int_t &iphi,
+ Int_t &ipre) const {
+ // given the tower index number it returns the based on the Z and Phi
+ // index numbers and if it is for the full tower or the pre-tower number.
+ // There are 2 times the number of towers to separate
+ // out the full towsers from the pre-towsers.
+ // Inputs:
+ // Int_t index // Tower index number [1-2*fNZ*fNPhi]
+ // Outputs:
+ // Int_t ieta // index allong z axis [1-fNZ]
+ // Int_t iphi // index allong phi axis [1-fNPhi]
+ // Int_t ipre // 0 = Full tower, 1 = Pre-shower tower only. [0,1]
+ // Returned
+ // none.
+ Int_t itowers;
+
+ itowers = GetNEta()*GetNPhi();
+ if(index<1 || index>2*itowers){
+ TString message("\n") ;
+ message += "index= " ;
+ message += index ;
+ message += " is out of range [1-" ;
+ message += 2*itowers ;
+ message += "], returning -1 for all." ;
+ Warning("TowerIndex", message.Data() ) ;
+ ieta = -1; iphi = -1; ipre = -1;
+ return ;
+ } // end if
+ ipre = 0;
+ if(index>itowers){ // pre shower indexs
+ ipre = 1;
+ index = index - itowers;
+ } // end if
+ ieta = 1+ (Int_t)((index-1)/GetNPhi());
+ iphi = index - GetNPhi()*(ieta-1);
+ 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 [1-2*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,ipre;
+ Double_t deta,dphi,phid;
+
+ TowerIndexes(index,ieta,iphi,ipre);
+ deta = (GetArm1EtaMax()-GetArm1EtaMin())/((Float_t)GetNEta());
+ eta = GetArm1EtaMin() + (((Float_t)ieta)-0.5)*deta;
+ dphi = (GetArm1PhiMax() - GetArm1PhiMin())/((Float_t)GetNPhi()); // in degrees.
+ phid = GetArm1PhiMin() + dphi*((Float_t)iphi -0.5);//iphi range [1-fNphi].
+ phi = phid;
+}
+
+//______________________________________________________________________
+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 = 1 + (Int_t)(((Float_t)GetNEta())*(eta-GetArm1EtaMin())/
+ (GetArm1EtaMax() - GetArm1EtaMin()));
+ if(ieta<=0 || ieta>GetNEta()){
+ TString message("\n") ;
+ message += "ieta = " ;
+ message += ieta ;
+ message += " eta=" ;
+ message += eta ;
+ message += " is outside of EMCAL. etamin=" ;
+ message += GetArm1EtaMin() ;
+ message += " to etamax=" ;
+ message += GetArm1EtaMax();
+ message += " returning -1";
+ Warning("TowerIndexFromEtaPhi", message.Data() ) ;
+ return -1;
+ } // end if
+ iphi = 1 + (Int_t)(((Float_t)GetNPhi())*(phi-GetArm1PhiMin())/
+ ((Float_t)(GetArm1PhiMax() - GetArm1PhiMin())));
+ if(iphi<=0 || iphi>GetNPhi()){
+ TString message("\n") ;
+ message += "iphi=" ;
+ message += iphi ;
+ message += "phi= " ;
+ message += phi ;
+ message += " is outside of EMCAL." ;
+ message += " Phimin=" ;
+ message += GetArm1PhiMin() ;
+ message += " PhiMax=" ;
+ message += GetArm1PhiMax() ;
+ message += " returning -1" ;
+ Warning("TowerIndexFromEtaPhi", message.Data() ) ;
+ return -1;
+ } // end if
+ return TowerIndex(ieta,iphi,0);
+}
+
+//______________________________________________________________________
+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] = 0 Not in Pre Shower layers
+ // = -1 In Pre Shower
+ // relid[2] = Row number inside EMCAL
+ // relid[3] = Column number inside EMCAL
+ // Input:
+ // Int_t AbsId // Tower index number [1-2*fNZ*fNPhi]
+ // Outputs:
+ // Int_t *relid // array of 5. Discribed above.
+ Bool_t rv = kTRUE ;
+ Int_t ieta=0,iphi=0,ipre=0,index=AbsId;
+
+ TowerIndexes(index,ieta,iphi,ipre);
+ relid[0] = 1;
+ relid[1] = 0;
+ if(ipre==1)
+ relid[1] = -1;
+ relid[2] = ieta;
+ relid[3] = 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[2]; // offset along x axis
+ Int_t iphi = relid[3]; // offset along z axis
+ Int_t ipre = relid[1]; // indicates -1 preshower, or 0 full tower.
+ Int_t index;
+ Float_t eta;
+
+ if(ipre==-1) ipre = 1;
+ index = TowerIndex(ieta,iphi,ipre);
+ EtaPhiFromIndex(index,eta,phi);
+ theta = 180.*(2.0*TMath::ATan(TMath::Exp(-eta)))/TMath::Pi();
+
+ 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,cyl_radius,kDeg2Rad;
+
+ Int_t ieta = relid[2]; // offset along x axis
+ Int_t iphi = relid[3]; // offset along z axis
+ Int_t ipre = relid[1]; // indicates -1 preshower, or 0 full tower.
+ Int_t index;
+
+
+ if(ipre==-1) ipre = 1;
+ index = TowerIndex(ieta,iphi,ipre);
+ EtaPhiFromIndex(index,eta,phi);
+ theta = 180.*(2.0*TMath::ATan(TMath::Exp(-eta)))/TMath::Pi();
+
+ kDeg2Rad = TMath::Pi() / static_cast<Double_t>(180) ;
+ cyl_radius = GetIPDistance()+ GetAirGap() ;
+ x = cyl_radius * TMath::Cos(phi * kDeg2Rad ) ;
+ y = cyl_radius * TMath::Cos(phi * kDeg2Rad ) ;
+ z = cyl_radius / 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, ipre1 = 0, ipre2 = 0;
+
+ TowerIndexes(index1,ieta1,iphi1,ipre1);
+ TowerIndexes(index2,ieta2,iphi2,ipre2);
+ if(ipre1!=ipre2) return anb;
+ if((ieta1>=ieta2-1 && ieta1<=ieta2+1) && (iphi1>=iphi2-1 &&iphi1<=iphi2+1))
+ anb = kTRUE;
+ return anb;
+}
+ */
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