1 /**************************************************************************
3 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
7 * Author: The ALICE Off-line Project. *
9 * Contributors are mentioned in the code where appropriate. *
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15 * documentation strictly for non-commercial purposes is hereby granted *
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23 * about the suitability of this software for any purpose. It is *
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27 **************************************************************************/
35 //_________________________________________________________________________
37 // Geometry class for EMCAL : singleton
39 // EMCAL consists of layers of scintillator and lead
41 // Places the the Barrel Geometry of The EMCAL at Midrapidity
43 // between 0 and 120 degrees of Phi and
47 // Number of Modules and Layers may be controlled by
49 // the name of the instance defined
51 // EMCALArch2x has more modules along both phi and eta
53 // EMCALArchxa has less Layers in the Radial Direction
55 //*-- Author: Sahal Yacoob (LBL / UCT)
57 // and : Yves Schutz (SUBATECH)
59 // and : Jennifer Klay (LBL)
63 // --- ROOT system ---
67 // --- Standard library ---
76 // --- AliRoot header files ---
86 #include "AliEMCALGeometry.h"
90 ClassImp(AliEMCALGeometry);
94 AliEMCALGeometry *AliEMCALGeometry::fgGeom = 0;
96 Bool_t AliEMCALGeometry::fgInit = kFALSE;
100 //______________________________________________________________________
102 AliEMCALGeometry::~AliEMCALGeometry(void){
108 //______________________________________________________________________
110 void AliEMCALGeometry::Init(void){
112 // Initializes the EMCAL parameters
116 fgInit = kFALSE; // Assume failer untill proven otherwise.
120 TString name(GetName()) ;
124 if( name != "EMCALArch1a" &&
126 name != "EMCALArch1b" &&
128 name != "EMCALArch2a" &&
130 name != "EMCALArch2b" ){
132 cerr << "ERROR: " << ClassName() << "::Init -> " << name.Data()
134 << " is not a known geometry (choose among EMCALArch1a, EMCALArch1b, EMCALArch2a and EMCALArch2b)"
144 if ( name == "EMCALArch1a" ||
146 name == "EMCALArch1b" ) {
154 if ( name == "EMCALArch2a" ||
156 name, "EMCALArch2b" ) {
164 if ( name == "EMCALArch1a" ||
166 name == "EMCALArch2a" ) {
172 if ( name == "EMCALArch1b" ||
174 name == "EMCALArch2b" ) {
184 fAirGap = 5.0; // cm, air gap between EMCAL mother volume and
188 fAlFrontThick = 3.18; // cm, Thickness of front Al layer
190 fPbRadThickness = 0.5; // cm, Thickness of theh Pb radiators.
192 fPreShowerSintThick = 0.6; // cm, Thickness of the sintilator for the
194 // preshower part of the calorimeter
196 fFullShowerSintThick = 0.5; // cm, Thickness of the sintilator for the
198 // full shower part of the calorimeter
200 fArm1PhiMin = 60.0; // degrees, Starting EMCAL Phi position
202 fArm1PhiMax = 180.0; // degrees, Ending EMCAL Phi position
204 fArm1EtaMin = -0.7; // pseudorapidity, Starting EMCAL Eta position
206 fArm1EtaMax = +0.7; // pseudorapidity, Ending EMCAL Eta position
208 fIPDistance = 454.0; // cm, Radial distance to inner surface of EMCAL
210 fShellThickness = GetAlFrontThickness() + 2.*GetPreSintThick() +
212 (fNLayers-2)*GetFullSintThick()+(fNLayers-1)*GetPbRadThick();
214 //below; cm, Z lenght of the EMCAL.
216 fZLength = 2.*ZFromEtaR(fIPDistance+fShellThickness,fArm1EtaMax);
218 fEnvelop[0] = fIPDistance; // mother volume inner radius
220 fEnvelop[1] = fIPDistance + fShellThickness; // mother volume outer r.
222 fEnvelop[2] = 1.00001*fZLength; // add some padding for mother volume.
224 fGap2Active = 1.0; // cm, Gap between
230 //______________________________________________________________________
232 AliEMCALGeometry * AliEMCALGeometry::GetInstance(){
234 // Returns the pointer of the unique instance
238 return static_cast<AliEMCALGeometry *>( fgGeom ) ;
242 //______________________________________________________________________
244 AliEMCALGeometry* AliEMCALGeometry::GetInstance(const Text_t* name,
246 const Text_t* title){
248 // Returns the pointer of the unique instance
252 AliEMCALGeometry * rv = 0;
256 if ( strcmp(name,"") == 0 ) rv = 0;
260 fgGeom = new AliEMCALGeometry(name, title);
262 if ( fgInit ) rv = (AliEMCALGeometry * ) fgGeom;
274 } // end if strcmp(name,"")
278 if ( strcmp(fgGeom->GetName(), name) != 0 ) {
280 cout << "AliEMCALGeometry <E> : current geometry is "
282 << fgGeom->GetName() << endl
284 << " you cannot call " << name
290 rv = (AliEMCALGeometry *) fgGeom;
300 //______________________________________________________________________
302 Int_t AliEMCALGeometry::TowerIndex(Int_t ieta,Int_t iphi,Int_t ipre) const {
304 // Returns the tower index number from the based on the Z and Phi
306 // index numbers. There are 2 times the number of towers to separate
308 // out the full towsers from the pre-towsers.
312 // Int_t ieta // index allong z axis [1-fNZ]
314 // Int_t iphi // index allong phi axis [1-fNPhi]
316 // Int_t ipre // 0 = Full tower, 1 = Pre-shower tower only. [0,1]
324 // Int_t the absoulute tower index. [1-2*fNZ*fNPhi]
330 if((ieta<=0 || ieta>GetNEta()) || (iphi<=0 || iphi>GetNPhi()) ||
332 (ipre<0 || ipre>1) ){
334 cout << "inputs out of range ieta=" << ieta << " [1-" << GetNEta();
336 cout << "] iphi=" << iphi << " [1-" << GetNPhi() << "] ipre=";
338 cout << ipre << "[0,1]. returning -1" << endl;
344 index = iphi + GetNPhi()*(ieta-1) + ipre*(GetNPhi()*GetNEta());
350 //______________________________________________________________________
352 void AliEMCALGeometry::TowerIndexes(Int_t index,Int_t &ieta,Int_t &iphi,
356 // given the tower index number it returns the based on the Z and Phi
358 // index numbers and if it is for the full tower or the pre-tower number.
360 // There are 2 times the number of towers to separate
362 // out the full towsers from the pre-towsers.
366 // Int_t index // Tower index number [1-2*fNZ*fNPhi]
370 // Int_t ieta // index allong z axis [1-fNZ]
372 // Int_t iphi // index allong phi axis [1-fNPhi]
374 // Int_t ipre // 0 = Full tower, 1 = Pre-shower tower only. [0,1]
384 itowers = GetNEta()*GetNPhi();
386 if(index<1 || index>2*itowers){
388 cout << "index=" << index <<" is out of range [1-";
390 cout << 2*itowers << "], returning -1 for all." << endl;
392 ieta = -1; iphi = -1; ipre = -1;
400 if(index>itowers){ // pre shower indexs
404 index = index - itowers;
408 ieta = 1+ (Int_t)((index-1)/GetNPhi());
410 iphi = index - GetNPhi()*(ieta-1);
416 //______________________________________________________________________
418 void AliEMCALGeometry::EtaPhiFromIndex(Int_t index,Float_t &eta,Float_t &phi) const {
420 // given the tower index number it returns the based on the eta and phi
426 // Int_t index // Tower index number [1-2*fNZ*fNPhi]
430 // Float_t eta // eta of center of tower in pseudorapidity
432 // Float_t phi // phi of center of tower in degrees
438 Int_t ieta,iphi,ipre;
440 Double_t deta,dphi,phid;
444 TowerIndexes(index,ieta,iphi,ipre);
446 deta = (GetArm1EtaMax()-GetArm1EtaMin())/((Float_t)GetNEta());
448 eta = GetArm1EtaMin() + (((Float_t)ieta)-0.5)*deta;
450 dphi = (GetArm1PhiMax() - GetArm1PhiMin())/((Float_t)GetNPhi()); // in degrees.
452 phid = GetArm1PhiMin() + dphi*((Float_t)iphi -0.5);//iphi range [1-fNphi].
458 //______________________________________________________________________
460 Int_t AliEMCALGeometry::TowerIndexFromEtaPhi(Float_t eta,Float_t phi) const {
462 // returns the tower index number based on the eta and phi of the tower.
466 // Float_t eta // eta of center of tower in pseudorapidity
468 // Float_t phi // phi of center of tower in degrees
476 // Int_t index // Tower index number [1-fNZ*fNPhi]
482 ieta = 1 + (Int_t)(((Float_t)GetNEta())*(eta-GetArm1EtaMin())/
484 (GetArm1EtaMax() - GetArm1EtaMin()));
486 if(ieta<=0 || ieta>GetNEta()){
488 cout << "TowerIndexFromEtaPhi:";
490 cout << "ieta = "<< ieta << " eta=" << eta << " is outside of EMCAL. etamin=";
492 cout << GetArm1EtaMin() << " to etamax=" << GetArm1EtaMax();
494 cout << " returning -1" << endl;
500 iphi = 1 + (Int_t)(((Float_t)GetNPhi())*(phi-GetArm1PhiMin())/
502 ((Float_t)(GetArm1PhiMax() - GetArm1PhiMin())));
504 if(iphi<=0 || iphi>GetNPhi()){
506 cout << "TowerIndexFromEtaPhi:";
508 cout << "iphi=" << iphi << " phi=" << phi << " is outside of EMCAL.";
510 cout << " Phimin=" << GetArm1PhiMin() << " PhiMax=" << GetArm1PhiMax();
512 cout << " returning -1" << endl;
518 return TowerIndex(ieta,iphi,0);
522 //______________________________________________________________________
524 Int_t AliEMCALGeometry::PreTowerIndexFromEtaPhi(Float_t eta,Float_t phi) const {
526 // returns the pretower index number based on the eta and phi of the tower.
530 // Float_t eta // eta of center of tower in pseudorapidity
532 // Float_t phi // phi of center of tower in degrees
540 // Int_t index // PreTower index number [fNZ*fNPhi-2*fNZ*fNPhi]
544 return GetNEta()*GetNPhi()+TowerIndexFromEtaPhi(eta,phi);
548 //______________________________________________________________________
550 Bool_t AliEMCALGeometry::AbsToRelNumbering(Int_t AbsId, Int_t *relid) const {
552 // Converts the absolute numbering into the following array/
554 // relid[0] = EMCAL Arm number 1:1
556 // relid[1] = 0 Not in Pre Shower layers
558 // = -1 In Pre Shower
560 // relid[2] = Row number inside EMCAL
562 // relid[3] = Column number inside EMCAL
566 // Int_t AbsId // Tower index number [1-2*fNZ*fNPhi]
570 // Int_t *relid // array of 5. Discribed above.
574 Int_t ieta=0,iphi=0,ipre=0,index=AbsId;
578 TowerIndexes(index,ieta,iphi,ipre);
598 //______________________________________________________________________
600 void AliEMCALGeometry::PosInAlice(const Int_t *relid,Float_t &theta,
602 Float_t &phi) const {
604 // Converts the relative numbering into the local EMCAL-module (x, z)
608 Int_t ieta = relid[2]; // offset along x axis
610 Int_t iphi = relid[3]; // offset along z axis
612 Int_t ipre = relid[1]; // indicates -1 preshower, or 0 full tower.
620 if(ipre==-1) ipre = 1;
622 index = TowerIndex(ieta,iphi,ipre);
624 EtaPhiFromIndex(index,eta,phi);
626 theta = 180.*(2.0*TMath::ATan(TMath::Exp(-eta)))/TMath::Pi();
636 //______________________________________________________________________
638 void AliEMCALGeometry::XYZFromIndex(const Int_t *relid,Float_t &x,Float_t &y, Float_t &z) const {
640 // given the tower relative number it returns the X, Y and Z
648 // Float_t x // x of center of tower in cm
650 // Float_t y // y of center of tower in cm
652 // Float_t z // z of centre of tower in cm
660 Float_t eta,theta, phi,cyl_radius,kDeg2Rad;
664 Int_t ieta = relid[2]; // offset along x axis
666 Int_t iphi = relid[3]; // offset along z axis
668 Int_t ipre = relid[1]; // indicates -1 preshower, or 0 full tower.
676 if(ipre==-1) ipre = 1;
678 index = TowerIndex(ieta,iphi,ipre);
680 EtaPhiFromIndex(index,eta,phi);
682 theta = 180.*(2.0*TMath::ATan(TMath::Exp(-eta)))/TMath::Pi();
690 kDeg2Rad = TMath::Pi() / static_cast<Double_t>(180) ;
692 cyl_radius = GetIPDistance()+ GetAirGap() ;
694 x = cyl_radius * TMath::Cos(phi * kDeg2Rad ) ;
696 y = cyl_radius * TMath::Cos(phi * kDeg2Rad ) ;
698 z = cyl_radius / TMath::Tan(theta * kDeg2Rad ) ;
708 //______________________________________________________________________
712 Boot_t AliEMCALGeometry::AreNeighbours(Int_t index1,Int_t index2) const {
714 // Returns kTRUE if the two towers are neighbours or not, including
716 // diagonals. Both indexes are required to be either towers or preshower.
720 // Int_t index1 // index of tower 1
722 // Int_t index2 // index of tower 2
730 // Boot_t kTRUE if the towers are neighbours otherwise false.
734 Int_t ieta1 = 0, ieta2 = 0, iphi1 = 0, iphi2 = 0, ipre1 = 0, ipre2 = 0;
738 TowerIndexes(index1,ieta1,iphi1,ipre1);
740 TowerIndexes(index2,ieta2,iphi2,ipre2);
742 if(ipre1!=ipre2) return anb;
744 if((ieta1>=ieta2-1 && ieta1<=ieta2+1) && (iphi1>=iphi2-1 &&iphi1<=iphi2+1))