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[u/mrichter/AliRoot.git] / EMCAL / AliEMCALGeometry.h
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2012850d 1#ifndef ALIEMCALGEOMETRY_H
2#define ALIEMCALGEOMETRY_H
3/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
5
6/* $Id$ */
7
8//_________________________________________________________________________
9// Geometry class for EMCAL : singleton
b13bbe81 10// EMCAL consists of a layers of scintillator, and lead.
2012850d 11//
b13bbe81 12//*-- Author: Sahal Yacoob (LBL / UCT)
13//*-- and : Yves Schutz (Subatech)
ca8f5bd0 14
2012850d 15#include <assert.h>
16
17// --- ROOT system ---
b13bbe81 18#include "TString.h"
19#include "TObjArray.h"
20#include "TVector3.h"
2012850d 21
2012850d 22// --- AliRoot header files ---
23
24#include "AliGeometry.h"
25
2012850d 26class AliEMCALGeometry : public AliGeometry {
ca8f5bd0 27 public:
28 AliEMCALGeometry() {
29 // default ctor, must be kept public for root persistency purposes,
30 // but should never be called by the outside world
31 };
32 AliEMCALGeometry(const AliEMCALGeometry & geom) {
33 // cpy ctor requested by Coding Convention but not yet needed
34 assert(0==1);
35 };
36 virtual ~AliEMCALGeometry(void) ;
37 static AliEMCALGeometry * GetInstance(const Text_t* name,
38 const Text_t* title="") ;
39 static AliEMCALGeometry * GetInstance() ;
40 AliEMCALGeometry & operator = (const AliEMCALGeometry & rvalue) const {
41 // assignement operator requested by coding convention but not needed
42 assert(0==1) ;
43 return *(GetInstance()) ;
44 };
45 virtual void GetGlobal(const AliRecPoint *, TVector3 &, TMatrix &) const {}
46 virtual void GetGlobal(const AliRecPoint *, TVector3 &) const {}
47 // General
48 Bool_t IsInitialized(void) const { return fgInit ; }
49 // Return EMCA geometrical parameters
50 // geometry
51 const Float_t GetAirGap() const { return fAirGap ; }
e908f07f 52 const Float_t GetAlFrontThickness() const { return fAlFrontThick;}
ca8f5bd0 53 const Float_t GetArm1PhiMin() const { return fArm1PhiMin ; }
54 const Float_t GetArm1PhiMax() const { return fArm1PhiMax ; }
e908f07f 55 const Float_t GetArm1EtaMin() const { return fArm1EtaMin;}
56 const Float_t GetArm1EtaMax() const { return fArm1EtaMax;}
ca8f5bd0 57 const Float_t GetIPDistance() const { return fIPDistance ; }
58 const Float_t GetEnvelop(Int_t index) const { return fEnvelop[index] ; }
59 const Float_t GetShellThickness() const { return fShellThickness ; }
60 const Float_t GetZLength() const { return fZLength ; }
61 const Float_t GetGap2Active() const {return fGap2Active ; }
e908f07f 62 const Float_t GetDeltaEta() const {return (fArm1EtaMax-fArm1EtaMin)/
63 ((Float_t)fNZ);}
64 const Float_t GetDeltaPhi() const {return (fArm1PhiMax-fArm1PhiMin)/
65 ((Float_t)fNPhi);}
ca8f5bd0 66 const Int_t GetNLayers() const {return fNLayers ;}
67 const Int_t GetNZ() const {return fNZ ;}
e908f07f 68 const Int_t GetNEta() const {return fNZ ;}
ca8f5bd0 69 const Int_t GetNPhi() const {return fNPhi ;}
e908f07f 70 const Float_t GetPbRadThick(){ // returns Pb radiator thickness in cm.
71 return fPbRadThickness;
72 }
73 const Float_t GetFullSintThick(){ // returns Full tower sintilator
74 // thickness in cm.
75 return fFullShowerSintThick;
76 }
77 const Float_t GetPreSintThick(){ // returns PreShower tower sintilator
78 // thickness in cm.
79 return fPreShowerSintThick;
80 }
81 Float_t AngleFromEta(Float_t eta){ // returns angle in radians for a given
82 // pseudorapidity.
83 return 2.0*TMath::ATan(TMath::Exp(-eta));
84 }
85 Float_t ZFromEtaR(Float_t r,Float_t eta){ // returns z in for a given
86 // pseudorapidity and r=sqrt(x*x+y*y).
87 return r/TMath::Tan(AngleFromEta(eta));
88 }
da98933e 89 Int_t TowerIndex(Int_t iz,Int_t iphi,Int_t ipre) const; // returns tower index
ca8f5bd0 90 // returns tower indexs iz, iphi.
da98933e 91 void TowerIndexes(Int_t index,Int_t &iz,Int_t &iphi,Int_t &ipre) const;
ca8f5bd0 92 // for a given tower index it returns eta and phi of center of that tower.
da98933e 93 void EtaPhiFromIndex(Int_t index,Float_t &eta,Float_t &phi) const;
ca8f5bd0 94 // for a given eta and phi in the EMCAL it returns the tower index.
da98933e 95 Int_t TowerIndexFromEtaPhi(Float_t eta,Float_t phi) const;
ca8f5bd0 96 // for a given eta and phi in the EMCAL it returns the pretower index.
da98933e 97 Int_t PreTowerIndexFromEtaPhi(Float_t eta,Float_t phi) const;
ca8f5bd0 98 // Returns theta and phi (degree) for a given EMCAL cell indecated by relid
a34b7b9f 99 void PosInAlice(const Int_t *relid,Float_t &theta,Float_t &phi) const ;
ca8f5bd0 100 // Returns an array indicating the Tower/preshower, iz, and iphi for a
101 // specific EMCAL indes.
da98933e 102 Bool_t AbsToRelNumbering(Int_t AbsId, Int_t *relid) const;
ca8f5bd0 103 /*
104 // Returns kTRUE if the two indexs are neighboring towers or preshowers.
da98933e 105 Boot_t AliEMCALGeometry::AreNeighbours(Int_t index1,Int_t index2) const;
ca8f5bd0 106 */
107
108 protected:
109 AliEMCALGeometry(const Text_t* name, const Text_t* title="") :
e908f07f 110 AliGeometry(name, title) {// ctor only for internal usage (singleton)
111 Init();
ca8f5bd0 112 };
113 void Init(void) ; // initializes the parameters of EMCAL
e908f07f 114
ca8f5bd0 115 private:
116 static AliEMCALGeometry * fgGeom ; // pointer to the unique instance
117 // of the singleton
e908f07f 118 static Bool_t fgInit;// Tells if geometry has been succesfully set up.
119 Float_t fAirGap; // Distance between envelop and active material
120 Float_t fAlFrontThick; // Thickness of the front Al face of the support box
121 Float_t fPreShowerSintThick; // Thickness of the sintilator for the
122 // preshower part of the calorimeter
123 Float_t fFullShowerSintThick;// Thickness of the sintilaor for the full
124 // shower part of the calorimeter
125 Float_t fPbRadThickness; // Thickness of Pb radiators cm.
126 Float_t fArm1PhiMin; // Minimum angular position of EMCAL in Phi (degrees)
127 Float_t fArm1PhiMax; // Maximum angular position of EMCAL in Phi (degrees)
128 Float_t fArm1EtaMin; // Minimum pseudorapidity position of EMCAL in Eta
129 Float_t fArm1EtaMax; // Maximum pseudorapidity position of EMCAL in Eta
ca8f5bd0 130
131 // It is assumed that Arm1 and Arm2 have the same following parameters
e908f07f 132 Float_t fEnvelop[3]; // the GEANT TUB for the detector
133 Float_t fIPDistance; // Radial Distance of the inner surface of the EMCAL
134 Float_t fShellThickness; // Total thickness in (x,y) direction
135 Float_t fZLength; // Total length in z direction
136 Float_t fGap2Active; // Gap between the envelop and the active material
137 Int_t fNLayers; // Number of layers of material in the R direction
138 Int_t fNZ; // Number of Towers in the Z direction
139 Int_t fNPhi; //Number of Towers in the Phi Direction
2012850d 140
e908f07f 141 ClassDef(AliEMCALGeometry,3) // EMCAL geometry class
2012850d 142
e908f07f 143};
2012850d 144
145#endif // AliEMCALGEOMETRY_H