//_________________________________________________________________________
// 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)
-// --- ROOT system ---
-
-// --- Standard library ---
-
-#include <iostream.h>
-
// --- AliRoot header files ---
+#include <TMath.h>
+#include <TVector3.h>
+
+// -- ALICE Headers.
+//#include "AliConst.h"
+// --- EMCAL headers
#include "AliEMCALGeometry.h"
-#include "AliConst.h"
ClassImp(AliEMCALGeometry);
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
-
- if(!( (strcmp( fName, "EMCALArch1a" ) == 0) |
- (strcmp( fName, "EMCALArch1b" ) == 0) |
- (strcmp( fName, "EMCALArch2a" ) == 0) |
- (strcmp( fName, "EMCALArch2b" ) == 0) )){
- fgInit = kFALSE;
- cout <<"Instance " << fName << " undefined" << endl;
- } // end if
- fgInit = kTRUE;
-
- // geometry
- fAirGap = 5.0;
- fArm1PhiMin = 0.0;
- fArm1PhiMax = 120.0;
-
- fIPDistance = 454.0;
- fZLength = 817.0;
- fEnvelop[0] = fIPDistance;
- fEnvelop[2] = fZLength;
- fGap2Active = 1.0;
- fShellThickness = 3.18 + 1.2 + (double)((2*fNLayers -3)/2);
- fEnvelop[1] = fIPDistance + fShellThickness;
-
- if (((strcmp( fName, "EMCALArch1a" )) == 0) |
- ((strcmp( fName, "EMCALArch1b" )) == 0)){
- fNZ = 96;
- fNPhi = 144;
- } // end if
- if (((strcmp( fName, "EMCALArch2a" )) == 0) |
- ((strcmp( fName, "EMCALArch2b" )) == 0)){
- fNZ = 112;
- fNPhi = 168;
- } // end if
- if (((strcmp( fName, "EMCALArch1a" )) == 0) |
- ((strcmp( fName, "EMCALArch2a" )) == 0)){
- fNLayers = 21;
- } // end if
- if (((strcmp( fName, "EMCALArch1b" )) == 0) |
- ((strcmp( fName, "EMCALArch2b" )) == 0)){
- fNLayers = 25;
- } // end if
+ // 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 = 13.1; // calculated with Birk's law implementation
+
+ 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 (AliEMCALGeometry *) fgGeom;
+ // Returns the pointer of the unique instance
+
+ return static_cast<AliEMCALGeometry *>( fgGeom ) ;
}
+
//______________________________________________________________________
AliEMCALGeometry* AliEMCALGeometry::GetInstance(const Text_t* name,
const Text_t* title){
} // end if strcmp(name,"")
}else{
if ( strcmp(fgGeom->GetName(), name) != 0 ) {
- cout << "AliEMCALGeometry <E> : current geometry is "
- << fgGeom->GetName() << endl
- << " you cannot call " << name
- << endl;
+ printf("\ncurrent geometry is ") ;
+ printf(fgGeom->GetName());
+ printf("\n you cannot call ");
+ printf(name);
}else{
- rv = (AliEMCALGeometry *) fgGeom;
+ 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())) {
+ Error("TowerIndex", "Unexpected parameters eta = %d phi = %d!", ieta, iphi) ;
+ return -1;
+ }
+ 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 {
+ Error("TowerIndexes", "Unexpected Id number!") ;
+ ieta = -1;
+ iphi = -1;
+ return;
+ }
+
+ 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 {
+ Error("PosInAlice", "Unexpected id # %d!", absid) ;
+ return;
+ }
+
+ 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 {
+ Error("XYZFromIndex", "Unexpected Tower section") ;
+ return;
+ }
+
+ 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;
+}
+
+Bool_t AliEMCALGeometry::IsInEMCAL(Double_t x, Double_t y, Double_t z) const {
+ // Checks whether point is inside the EMCal volume
+ //
+ // Code uses cylindrical approximation made of inner radius (for speed)
+ //
+ // Points behind EMCAl, i.e. R > outer radius, but eta, phi in acceptance
+ // are considered to inside
+
+ Double_t r=sqrt(x*x+y*y);
+
+ if ( r > fEnvelop[0] ) {
+ Double_t theta;
+ theta = TMath::ATan2(r,z);
+ Double_t eta;
+ if(theta == 0)
+ eta = 9999;
+ else
+ eta = -TMath::Log(TMath::Tan(theta/2.));
+ if (eta < fArm1EtaMin || eta > fArm1EtaMax)
+ return 0;
+
+ Double_t phi = TMath::ATan2(y,x) * 180./TMath::Pi();
+ if (phi > fArm1PhiMin && phi < fArm1PhiMax)
+ return 1;
+ }
+ return 0;
+}
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff