1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
18 //_________________________________________________________________________
19 // Geometry class for EMCAL : singleton
20 // EMCAL consists of layers of scintillator and lead
21 // Places the the Barrel Geometry of The EMCAL at Midrapidity
22 // between 0 and 120 degrees of Phi and
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
28 //*-- Author: Sahal Yacoob (LBL / UCT)
29 // and : Yves Schutz (SUBATECH)
30 // and : Jennifer Klay (LBL)
32 // --- ROOT system ---
34 // --- Standard library ---
38 // --- AliRoot header files ---
43 #include "AliEMCALGeometry.h"
45 ClassImp(AliEMCALGeometry);
47 AliEMCALGeometry *AliEMCALGeometry::fgGeom = 0;
48 Bool_t AliEMCALGeometry::fgInit = kFALSE;
50 //______________________________________________________________________
51 AliEMCALGeometry::~AliEMCALGeometry(void){
54 //______________________________________________________________________
55 void AliEMCALGeometry::Init(void){
56 // Initializes the EMCAL parameters
58 fgInit = kFALSE; // Assume failer untill proven otherwise.
59 if(!( (strcmp( fName, "EMCALArch1a" ) == 0) |
60 (strcmp( fName, "EMCALArch1b" ) == 0) |
61 (strcmp( fName, "EMCALArch2a" ) == 0) |
62 (strcmp( fName, "EMCALArch2b" ) == 0) )){
63 cout <<"Instance " << fName << " undefined" << endl;
66 if (((strcmp( fName, "EMCALArch1a" )) == 0) |
67 ((strcmp( fName, "EMCALArch1b" )) == 0)){
71 if (((strcmp( fName, "EMCALArch2a" )) == 0) |
72 ((strcmp( fName, "EMCALArch2b" )) == 0)){
76 if (((strcmp( fName, "EMCALArch1a" )) == 0) |
77 ((strcmp( fName, "EMCALArch2a" )) == 0)){
80 if (((strcmp( fName, "EMCALArch1b" )) == 0) |
81 ((strcmp( fName, "EMCALArch2b" )) == 0)){
86 fAirGap = 5.0; // cm, air gap between EMCAL mother volume and
88 fAlFrontThick = 3.18; // cm, Thickness of front Al layer
89 fPbRadThickness = 0.5; // cm, Thickness of theh Pb radiators.
90 fPreShowerSintThick = 0.6; // cm, Thickness of the sintilator for the
91 // preshower part of the calorimeter
92 fFullShowerSintThick = 0.5; // cm, Thickness of the sintilator for the
93 // full shower part of the calorimeter
94 fArm1PhiMin = 0.0; // degrees, Starting EMCAL Phi position
95 fArm1PhiMax = 120.0; // degrees, Ending EMCAL Phi position
96 fArm1EtaMin = -0.7; // pseudorapidity, Starting EMCAL Eta position
97 fArm1EtaMax = +0.7; // pseudorapidity, Ending EMCAL Eta position
98 fIPDistance = 454.0; // cm, Radial distance to inner surface of EMCAL
99 fShellThickness = GetAlFrontThickness() + 2.*GetPreSintThick() +
100 (fNLayers-2)*GetFullSintThick()+(fNLayers-1)*GetPbRadThick();
101 //below; cm, Z lenght of the EMCAL.
102 fZLength = 2.*ZFromEtaR(fIPDistance+fShellThickness,fArm1EtaMax);
103 fEnvelop[0] = fIPDistance; // mother volume inner radius
104 fEnvelop[1] = fIPDistance + fShellThickness; // mother volume outer r.
105 fEnvelop[2] = 1.00001*fZLength; // add some padding for mother volume.
106 fGap2Active = 1.0; // cm, Gap between
109 //______________________________________________________________________
110 AliEMCALGeometry * AliEMCALGeometry::GetInstance(){
111 // Returns the pointer of the unique instance
113 return (AliEMCALGeometry *) fgGeom;
115 //______________________________________________________________________
116 AliEMCALGeometry* AliEMCALGeometry::GetInstance(const Text_t* name,
117 const Text_t* title){
118 // Returns the pointer of the unique instance
120 AliEMCALGeometry * rv = 0;
122 if ( strcmp(name,"") == 0 ) rv = 0;
124 fgGeom = new AliEMCALGeometry(name, title);
125 if ( fgInit ) rv = (AliEMCALGeometry * ) fgGeom;
131 } // end if strcmp(name,"")
133 if ( strcmp(fgGeom->GetName(), name) != 0 ) {
134 cout << "AliEMCALGeometry <E> : current geometry is "
135 << fgGeom->GetName() << endl
136 << " you cannot call " << name
139 rv = (AliEMCALGeometry *) fgGeom;
144 //______________________________________________________________________
145 Int_t AliEMCALGeometry::TowerIndex(Int_t ieta,Int_t iphi,Int_t ipre) const {
146 // Returns the tower index number from the based on the Z and Phi
147 // index numbers. There are 2 times the number of towers to separate
148 // out the full towsers from the pre-towsers.
150 // Int_t ieta // index allong z axis [1-fNZ]
151 // Int_t iphi // index allong phi axis [1-fNPhi]
152 // Int_t ipre // 0 = Full tower, 1 = Pre-shower tower only. [0,1]
156 // Int_t the absoulute tower index. [1-2*fNZ*fNPhi]
159 if((ieta<=0 || ieta>GetNEta()) || (iphi<=0 || iphi>GetNPhi()) ||
160 (ipre<0 || ipre>1) ){
161 cout << "inputs out of range ieta=" << ieta << " [1-" << GetNEta();
162 cout << "] iphi=" << iphi << " [1-" << GetNPhi() << "] ipre=";
163 cout << ipre << "[0,1]. returning -1" << endl;
166 index = iphi + GetNPhi()*(ieta-1) + ipre*(GetNPhi()*GetNEta());
169 //______________________________________________________________________
170 void AliEMCALGeometry::TowerIndexes(Int_t index,Int_t &ieta,Int_t &iphi,
172 // given the tower index number it returns the based on the Z and Phi
173 // index numbers and if it is for the full tower or the pre-tower number.
174 // There are 2 times the number of towers to separate
175 // out the full towsers from the pre-towsers.
177 // Int_t index // Tower index number [1-2*fNZ*fNPhi]
179 // Int_t ieta // index allong z axis [1-fNZ]
180 // Int_t iphi // index allong phi axis [1-fNPhi]
181 // Int_t ipre // 0 = Full tower, 1 = Pre-shower tower only. [0,1]
186 itowers = GetNEta()*GetNPhi();
187 if(index<1 || index>2*itowers){
188 cout << "index=" << index <<" is out of range [1-";
189 cout << 2*itowers << "], returning -1 for all." << endl;
190 ieta = -1; iphi = -1; ipre = -1;
194 if(index>itowers){ // pre shower indexs
196 index = index - itowers;
198 ieta = 1+ (Int_t)((index-1)/GetNPhi());
199 iphi = index - GetNPhi()*(ieta-1);
202 //______________________________________________________________________
203 void AliEMCALGeometry::EtaPhiFromIndex(Int_t index,Float_t &eta,Float_t &phi) const {
204 // given the tower index number it returns the based on the eta and phi
207 // Int_t index // Tower index number [1-2*fNZ*fNPhi]
209 // Float_t eta // eta of center of tower in pseudorapidity
210 // Float_t phi // phi of center of tower in degrees
213 Int_t ieta,iphi,ipre;
214 Double_t deta,dphi,phid;
216 TowerIndexes(index,ieta,iphi,ipre);
217 deta = (GetArm1EtaMax()-GetArm1EtaMin())/((Float_t)GetNEta());
218 eta = GetArm1EtaMin() + (((Float_t)ieta)-0.5)*deta;
219 dphi = (GetArm1PhiMax() - GetArm1PhiMin())/((Float_t)GetNPhi()); // in degrees.
220 phid = GetArm1PhiMin() + dphi*((Float_t)iphi -0.5);//iphi range [1-fNphi].
223 //______________________________________________________________________
224 Int_t AliEMCALGeometry::TowerIndexFromEtaPhi(Float_t eta,Float_t phi) const {
225 // returns the tower index number based on the eta and phi of the tower.
227 // Float_t eta // eta of center of tower in pseudorapidity
228 // Float_t phi // phi of center of tower in degrees
232 // Int_t index // Tower index number [1-fNZ*fNPhi]
235 ieta = 1 + (Int_t)(((Float_t)GetNEta())*(eta-GetArm1EtaMin())/
236 (GetArm1EtaMax() - GetArm1EtaMin()));
237 if(ieta<=0 || ieta>GetNEta()){
238 cout << "TowerIndexFromEtaPhi:";
239 cout << "ieta = "<< ieta << " eta=" << eta << " is outside of EMCAL. etamin=";
240 cout << GetArm1EtaMin() << " to etamax=" << GetArm1EtaMax();
241 cout << " returning -1" << endl;
244 iphi = 1 + (Int_t)(((Float_t)GetNPhi())*(phi-GetArm1PhiMin())/
245 ((Float_t)(GetArm1PhiMax() - GetArm1PhiMin())));
246 if(iphi<=0 || iphi>GetNPhi()){
247 cout << "TowerIndexFromEtaPhi:";
248 cout << "iphi=" << iphi << " phi=" << phi << " is outside of EMCAL.";
249 cout << " Phimin=" << GetArm1PhiMin() << " PhiMax=" << GetArm1PhiMax();
250 cout << " returning -1" << endl;
253 return TowerIndex(ieta,iphi,0);
255 //______________________________________________________________________
256 Int_t AliEMCALGeometry::PreTowerIndexFromEtaPhi(Float_t eta,Float_t phi) const {
257 // returns the pretower index number based on the eta and phi of the tower.
259 // Float_t eta // eta of center of tower in pseudorapidity
260 // Float_t phi // phi of center of tower in degrees
264 // Int_t index // PreTower index number [fNZ*fNPhi-2*fNZ*fNPhi]
266 return GetNEta()*GetNPhi()+TowerIndexFromEtaPhi(eta,phi);
268 //______________________________________________________________________
269 Bool_t AliEMCALGeometry::AbsToRelNumbering(Int_t AbsId, Int_t *relid) const {
270 // Converts the absolute numbering into the following array/
271 // relid[0] = EMCAL Arm number 1:1
272 // relid[1] = 0 Not in Pre Shower layers
273 // = -1 In Pre Shower
274 // relid[2] = Row number inside EMCAL
275 // relid[3] = Column number inside EMCAL
277 // Int_t AbsId // Tower index number [1-2*fNZ*fNPhi]
279 // Int_t *relid // array of 5. Discribed above.
281 Int_t ieta=0,iphi=0,ipre=0,index=AbsId;
283 TowerIndexes(index,ieta,iphi,ipre);
293 //______________________________________________________________________
294 void AliEMCALGeometry::PosInAlice(const Int_t *relid,Float_t &theta,
295 Float_t &phi) const {
296 // Converts the relative numbering into the local EMCAL-module (x, z)
298 Int_t ieta = relid[2]; // offset along x axis
299 Int_t iphi = relid[3]; // offset along z axis
300 Int_t ipre = relid[1]; // indicates -1 preshower, or 0 full tower.
304 if(ipre==-1) ipre = 1;
305 index = TowerIndex(ieta,iphi,ipre);
306 EtaPhiFromIndex(index,eta,phi);
307 theta = 180.*(2.0*TMath::ATan(TMath::Exp(-eta)))/TMath::Pi();
312 //______________________________________________________________________
313 void AliEMCALGeometry::XYZFromIndex(const Int_t *relid,Float_t &x,Float_t &y, Float_t &z) const {
314 // given the tower relative number it returns the X, Y and Z
318 // Float_t x // x of center of tower in cm
319 // Float_t y // y of center of tower in cm
320 // Float_t z // z of centre of tower in cm
324 Float_t eta,theta, phi,cyl_radius,kDeg2Rad;
326 Int_t ieta = relid[2]; // offset along x axis
327 Int_t iphi = relid[3]; // offset along z axis
328 Int_t ipre = relid[1]; // indicates -1 preshower, or 0 full tower.
332 if(ipre==-1) ipre = 1;
333 index = TowerIndex(ieta,iphi,ipre);
334 EtaPhiFromIndex(index,eta,phi);
335 theta = 180.*(2.0*TMath::ATan(TMath::Exp(-eta)))/TMath::Pi();
339 kDeg2Rad = TMath::Pi() / static_cast<Double_t>(180) ;
340 cyl_radius = GetIPDistance()+ GetAirGap() ;
341 x = cyl_radius * TMath::Cos(phi * kDeg2Rad ) ;
342 y = cyl_radius * TMath::Cos(phi * kDeg2Rad ) ;
343 z = cyl_radius / TMath::Tan(theta * kDeg2Rad ) ;
348 //______________________________________________________________________
350 Boot_t AliEMCALGeometry::AreNeighbours(Int_t index1,Int_t index2) const {
351 // Returns kTRUE if the two towers are neighbours or not, including
352 // diagonals. Both indexes are required to be either towers or preshower.
354 // Int_t index1 // index of tower 1
355 // Int_t index2 // index of tower 2
359 // Boot_t kTRUE if the towers are neighbours otherwise false.
361 Int_t ieta1 = 0, ieta2 = 0, iphi1 = 0, iphi2 = 0, ipre1 = 0, ipre2 = 0;
363 TowerIndexes(index1,ieta1,iphi1,ipre1);
364 TowerIndexes(index2,ieta2,iphi2,ipre2);
365 if(ipre1!=ipre2) return anb;
366 if((ieta1>=ieta2-1 && ieta1<=ieta2+1) && (iphi1>=iphi2-1 &&iphi1<=iphi2+1))