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 ---
37 // --- AliRoot header files ---
44 #include "AliEMCALGeometry.h"
46 ClassImp(AliEMCALGeometry);
48 AliEMCALGeometry *AliEMCALGeometry::fgGeom = 0;
49 Bool_t AliEMCALGeometry::fgInit = kFALSE;
51 //______________________________________________________________________
52 AliEMCALGeometry::~AliEMCALGeometry(void){
55 //______________________________________________________________________
56 void AliEMCALGeometry::Init(void){
57 // Initializes the EMCAL parameters
59 fgInit = kFALSE; // Assume failer untill proven otherwise.
61 TString name(GetName()) ;
63 if( name != "EMCALArch1a" &&
64 name != "EMCALArch1b" &&
65 name != "EMCALArch2a" &&
66 name != "EMCALArch2b" ){
67 Fatal("Init", "%s is not a known geometry (choose among EMCALArch1a, EMCALArch1b, EMCALArch2a and EMCALArch2b)", name.Data()) ;
70 if ( name == "EMCALArch1a" ||
71 name == "EMCALArch1b" ) {
75 if ( name == "EMCALArch2a" ||
76 name, "EMCALArch2b" ) {
80 if ( name == "EMCALArch1a" ||
81 name == "EMCALArch2a" ) {
84 if ( name == "EMCALArch1b" ||
85 name == "EMCALArch2b" ) {
90 //fAirGap = 5.0; // cm, air gap between EMCAL mother volume and
92 fAlFrontThick = 3.18; // cm, Thickness of front Al layer
93 fGap2Active = 1.0; // cm, Gap between Al and 1st Scintillator
94 fPbRadThickness = 0.5; // cm, Thickness of the Pb radiators.
95 fPreShowerSintThick = 0.6; // cm, Thickness of the sintilator for the
96 // preshower part of the calorimeter
97 fFullShowerSintThick = 0.5; // cm, Thickness of the sintilator for the
98 // full shower part of the calorimeter
99 fArm1PhiMin = 60.0; // degrees, Starting EMCAL Phi position
100 fArm1PhiMax = 180.0; // degrees, Ending EMCAL Phi position
101 fArm1EtaMin = -0.7; // pseudorapidity, Starting EMCAL Eta position
102 fArm1EtaMax = +0.7; // pseudorapidity, Ending EMCAL Eta position
103 fIPDistance = 454.0; // cm, Radial distance to inner surface of EMCAL
104 fShellThickness = fAlFrontThick + fGap2Active + 2.*(GetPreSintThick() + GetPbRadThick()) +
105 (fNLayers-3)*(GetFullSintThick()+ GetPbRadThick()) + GetFullSintThick() ;
106 //below; cm, Z length of the EMCAL.
107 fZLength = 2.*ZFromEtaR(fIPDistance+fShellThickness,fArm1EtaMax);
108 fEnvelop[0] = fIPDistance; // mother volume inner radius
109 fEnvelop[1] = fIPDistance + fShellThickness; // mother volume outer r.
110 fEnvelop[2] = 1.00001*fZLength; // add some padding for mother volume.
114 //______________________________________________________________________
115 AliEMCALGeometry * AliEMCALGeometry::GetInstance(){
116 // Returns the pointer of the unique instance
118 return static_cast<AliEMCALGeometry *>( fgGeom ) ;
121 //______________________________________________________________________
122 AliEMCALGeometry* AliEMCALGeometry::GetInstance(const Text_t* name,
123 const Text_t* title){
124 // Returns the pointer of the unique instance
126 AliEMCALGeometry * rv = 0;
128 if ( strcmp(name,"") == 0 ) rv = 0;
130 fgGeom = new AliEMCALGeometry(name, title);
131 if ( fgInit ) rv = (AliEMCALGeometry * ) fgGeom;
137 } // end if strcmp(name,"")
139 if ( strcmp(fgGeom->GetName(), name) != 0 ) {
140 TString message("\n") ;
141 message += "current geometry is " ;
142 message += fgGeom->GetName() ;
143 message += "\n you cannot call " ;
145 ::Info("GetGeometry", message.Data() ) ;
147 rv = (AliEMCALGeometry *) fgGeom;
153 //______________________________________________________________________
154 Int_t AliEMCALGeometry::TowerIndex(Int_t ieta,Int_t iphi,Int_t ipre) const {
155 // Returns the tower index number from the based on the Z and Phi
156 // index numbers. There are 2 times the number of towers to separate
157 // out the full towsers from the pre-towsers.
159 // Int_t ieta // index allong z axis [1-fNZ]
160 // Int_t iphi // index allong phi axis [1-fNPhi]
161 // Int_t ipre // 0 = Full tower, 1 = Pre-shower tower only. [0,1]
165 // Int_t the absoulute tower index. [1-2*fNZ*fNPhi]
168 if((ieta<=0 || ieta>GetNEta()) || (iphi<=0 || iphi>GetNPhi()) ||
169 (ipre<0 || ipre>1) ){
170 TString message ("\n") ;
171 message += "inputs out of range ieta= " ;
174 message += GetNEta() ;
175 message += "] iphi= " ;
178 message += GetNPhi() ;
179 message += "] ipre= " ;
181 message += "[0,1]. returning -1" ;
182 Warning("TowerIndex", message.Data() ) ;
185 index = iphi + GetNPhi()*(ieta-1) + ipre*(GetNPhi()*GetNEta());
189 //______________________________________________________________________
190 void AliEMCALGeometry::TowerIndexes(Int_t index,Int_t &ieta,Int_t &iphi,
192 // given the tower index number it returns the based on the Z and Phi
193 // index numbers and if it is for the full tower or the pre-tower number.
194 // There are 2 times the number of towers to separate
195 // out the full towsers from the pre-towsers.
197 // Int_t index // Tower index number [1-2*fNZ*fNPhi]
199 // Int_t ieta // index allong z axis [1-fNZ]
200 // Int_t iphi // index allong phi axis [1-fNPhi]
201 // Int_t ipre // 0 = Full tower, 1 = Pre-shower tower only. [0,1]
206 itowers = GetNEta()*GetNPhi();
207 if(index<1 || index>2*itowers){
208 TString message("\n") ;
209 message += "index= " ;
211 message += " is out of range [1-" ;
212 message += 2*itowers ;
213 message += "], returning -1 for all." ;
214 Warning("TowerIndex", message.Data() ) ;
215 ieta = -1; iphi = -1; ipre = -1;
219 if(index>itowers){ // pre shower indexs
221 index = index - itowers;
223 ieta = 1+ (Int_t)((index-1)/GetNPhi());
224 iphi = index - GetNPhi()*(ieta-1);
228 //______________________________________________________________________
229 void AliEMCALGeometry::EtaPhiFromIndex(Int_t index,Float_t &eta,Float_t &phi) const {
230 // given the tower index number it returns the based on the eta and phi
233 // Int_t index // Tower index number [1-2*fNZ*fNPhi]
235 // Float_t eta // eta of center of tower in pseudorapidity
236 // Float_t phi // phi of center of tower in degrees
239 Int_t ieta,iphi,ipre;
240 Double_t deta,dphi,phid;
242 TowerIndexes(index,ieta,iphi,ipre);
243 deta = (GetArm1EtaMax()-GetArm1EtaMin())/((Float_t)GetNEta());
244 eta = GetArm1EtaMin() + (((Float_t)ieta)-0.5)*deta;
245 dphi = (GetArm1PhiMax() - GetArm1PhiMin())/((Float_t)GetNPhi()); // in degrees.
246 phid = GetArm1PhiMin() + dphi*((Float_t)iphi -0.5);//iphi range [1-fNphi].
250 //______________________________________________________________________
251 Int_t AliEMCALGeometry::TowerIndexFromEtaPhi(Float_t eta,Float_t phi) const {
252 // returns the tower index number based on the eta and phi of the tower.
254 // Float_t eta // eta of center of tower in pseudorapidity
255 // Float_t phi // phi of center of tower in degrees
259 // Int_t index // Tower index number [1-fNZ*fNPhi]
262 ieta = 1 + (Int_t)(((Float_t)GetNEta())*(eta-GetArm1EtaMin())/
263 (GetArm1EtaMax() - GetArm1EtaMin()));
264 if(ieta<=0 || ieta>GetNEta()){
265 TString message("\n") ;
266 message += "ieta = " ;
270 message += " is outside of EMCAL. etamin=" ;
271 message += GetArm1EtaMin() ;
272 message += " to etamax=" ;
273 message += GetArm1EtaMax();
274 message += " returning -1";
275 Warning("TowerIndexFromEtaPhi", message.Data() ) ;
278 iphi = 1 + (Int_t)(((Float_t)GetNPhi())*(phi-GetArm1PhiMin())/
279 ((Float_t)(GetArm1PhiMax() - GetArm1PhiMin())));
280 if(iphi<=0 || iphi>GetNPhi()){
281 TString message("\n") ;
286 message += " is outside of EMCAL." ;
287 message += " Phimin=" ;
288 message += GetArm1PhiMin() ;
289 message += " PhiMax=" ;
290 message += GetArm1PhiMax() ;
291 message += " returning -1" ;
292 Warning("TowerIndexFromEtaPhi", message.Data() ) ;
295 return TowerIndex(ieta,iphi,0);
298 //______________________________________________________________________
299 Int_t AliEMCALGeometry::PreTowerIndexFromEtaPhi(Float_t eta,Float_t phi) const {
300 // returns the pretower index number based on the eta and phi of the tower.
302 // Float_t eta // eta of center of tower in pseudorapidity
303 // Float_t phi // phi of center of tower in degrees
307 // Int_t index // PreTower index number [fNZ*fNPhi-2*fNZ*fNPhi]
309 return GetNEta()*GetNPhi()+TowerIndexFromEtaPhi(eta,phi);
312 //______________________________________________________________________
313 Bool_t AliEMCALGeometry::AbsToRelNumbering(Int_t AbsId, Int_t *relid) const {
314 // Converts the absolute numbering into the following array/
315 // relid[0] = EMCAL Arm number 1:1
316 // relid[1] = 0 Not in Pre Shower layers
317 // = -1 In Pre Shower
318 // relid[2] = Row number inside EMCAL
319 // relid[3] = Column number inside EMCAL
321 // Int_t AbsId // Tower index number [1-2*fNZ*fNPhi]
323 // Int_t *relid // array of 5. Discribed above.
325 Int_t ieta=0,iphi=0,ipre=0,index=AbsId;
327 TowerIndexes(index,ieta,iphi,ipre);
338 //______________________________________________________________________
339 void AliEMCALGeometry::PosInAlice(const Int_t *relid,Float_t &theta,
340 Float_t &phi) const {
341 // Converts the relative numbering into the local EMCAL-module (x, z)
343 Int_t ieta = relid[2]; // offset along x axis
344 Int_t iphi = relid[3]; // offset along z axis
345 Int_t ipre = relid[1]; // indicates -1 preshower, or 0 full tower.
349 if(ipre==-1) ipre = 1;
350 index = TowerIndex(ieta,iphi,ipre);
351 EtaPhiFromIndex(index,eta,phi);
352 theta = 180.*(2.0*TMath::ATan(TMath::Exp(-eta)))/TMath::Pi();
357 //______________________________________________________________________
358 void AliEMCALGeometry::XYZFromIndex(const Int_t *relid,Float_t &x,Float_t &y, Float_t &z) const {
359 // given the tower relative number it returns the X, Y and Z
363 // Float_t x // x of center of tower in cm
364 // Float_t y // y of center of tower in cm
365 // Float_t z // z of centre of tower in cm
369 Float_t eta,theta, phi,cyl_radius,kDeg2Rad;
371 Int_t ieta = relid[2]; // offset along x axis
372 Int_t iphi = relid[3]; // offset along z axis
373 Int_t ipre = relid[1]; // indicates -1 preshower, or 0 full tower.
377 if(ipre==-1) ipre = 1;
378 index = TowerIndex(ieta,iphi,ipre);
379 EtaPhiFromIndex(index,eta,phi);
380 theta = 180.*(2.0*TMath::ATan(TMath::Exp(-eta)))/TMath::Pi();
382 kDeg2Rad = TMath::Pi() / static_cast<Double_t>(180) ;
383 cyl_radius = GetIPDistance()+ GetAirGap() ;
384 x = cyl_radius * TMath::Cos(phi * kDeg2Rad ) ;
385 y = cyl_radius * TMath::Sin(phi * kDeg2Rad ) ;
386 z = cyl_radius / TMath::Tan(theta * kDeg2Rad ) ;
391 //______________________________________________________________________
393 Boot_t AliEMCALGeometry::AreNeighbours(Int_t index1,Int_t index2) const {
394 // Returns kTRUE if the two towers are neighbours or not, including
395 // diagonals. Both indexes are required to be either towers or preshower.
397 // Int_t index1 // index of tower 1
398 // Int_t index2 // index of tower 2
402 // Boot_t kTRUE if the towers are neighbours otherwise false.
404 Int_t ieta1 = 0, ieta2 = 0, iphi1 = 0, iphi2 = 0, ipre1 = 0, ipre2 = 0;
406 TowerIndexes(index1,ieta1,iphi1,ipre1);
407 TowerIndexes(index2,ieta2,iphi2,ipre2);
408 if(ipre1!=ipre2) return anb;
409 if((ieta1>=ieta2-1 && ieta1<=ieta2+1) && (iphi1>=iphi2-1 &&iphi1<=iphi2+1))