new classes for track segments
[u/mrichter/AliRoot.git] / EMCAL / AliEMCALGeometry.cxx
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2012850d 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
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 **************************************************************************/
15
16/* $Id$*/
17
18//_________________________________________________________________________
19// Geometry class for EMCAL : singleton
b13bbe81 20// EMCAL consists of layers of scintillator and lead
ffa6d63b 21// Places the the Barrel Geometry of The EMCAL at Midrapidity
22// between 0 and 120 degrees of Phi and
23// -0.7 to 0.7 in eta
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
b13bbe81 28//*-- Author: Sahal Yacoob (LBL / UCT)
29// and : Yves Schutz (SUBATECH)
30// and : Jennifer Klay (LBL)
2012850d 31
32// --- ROOT system ---
33
34// --- Standard library ---
bba4716c 35#include <stdlib.h>
2012850d 36
37// --- AliRoot header files ---
ca8f5bd0 38#include <TMath.h>
173558f2 39
ca8f5bd0 40// -- ALICE Headers.
2012850d 41#include "AliConst.h"
173558f2 42
ca8f5bd0 43// --- EMCAL headers
44#include "AliEMCALGeometry.h"
2012850d 45
b13bbe81 46ClassImp(AliEMCALGeometry);
2012850d 47
b13bbe81 48AliEMCALGeometry *AliEMCALGeometry::fgGeom = 0;
49Bool_t AliEMCALGeometry::fgInit = kFALSE;
2012850d 50
b13bbe81 51//______________________________________________________________________
52AliEMCALGeometry::~AliEMCALGeometry(void){
53 // dtor
2012850d 54}
b13bbe81 55
395c7ba2 56//______________________________________________________________________
57const Bool_t AliEMCALGeometry::AreInSameTower(Int_t id1, Int_t id2) const {
58 Int_t idmax = TMath::Max(id1, id2) ;
59 Int_t idmin = TMath::Min(id1, id2) ;
60 if ( ((idmax - GetNZ() * GetNPhi()) == idmin ) ||
61 ((idmax - 2 * GetNZ() * GetNPhi()) == idmin ) )
62 return kTRUE ;
63 else
64 return kFALSE ;
65}
05a92d59 66
395c7ba2 67//______________________________________________________________________
68void AliEMCALGeometry::Init(void){
69 // Initializes the EMCAL parameters
70 // naming convention : GUV_L_WX_N_YZ_M gives the composition of a tower
71 // UV inform about the compsition of the pre-shower section:
72 // thickness in mm of Pb radiator (U) and of scintillator (V), and number of scintillator layers (L)
73 // WX inform about the composition of the EM calorimeter section:
74 // thickness in mm of Pb radiator (W) and of scintillator (X), and number of scintillator layers (N)
75 // YZ inform about the composition of the hadron calorimeter section:
76 // thickness in mm of Cu radiator (Y) and of scintillator (Z), and number of scintillator layers (M)
77 // Valid geometries are G56_2_55_19_104_14
78 // G56_2_55_19 or EMCAL_5655_21
79 // G65_2_64_19 or EMCAL_6564_21
80
81 fgInit = kFALSE; // Assume failer untill proven otherwise.
82 TString name(GetName()) ;
83
84 if ( name == "G56_2_55_19_104_14" ) {
85 fPRPbRadThickness = 0.5; // cm, Thickness of the Pb radiators for the preshower section
86 fPRScintThick = 0.6; // cm, Thickness of the sintilator for the preshower section of the tower
87 fNPRLayers = 2; // number of scintillator layers in the preshower section
88
89 fECPbRadThickness = 0.5; // cm, Thickness of the Pb radiators for the EM calorimeter section
90 fECScintThick = 0.5; // cm, Thickness of the sintilator for the EM alorimeter section of the tower
91 fNECLayers = 19; // number of scintillator layers in the EM calorimeter section
92
93 fHCCuRadThickness = 1.0; // cm, Thickness of the Cu radiators.
94 fHCScintThick = 0.4; // cm, Thickness of the sintilator for the hadronic alorimeter section of the tower
95 fNHCLayers = 14; // number of scintillator layers in the hadronic calorimeter section
96
97 fSampling = 12. ;
98 fSummationFraction = 0.8 ;
99
100 fAlFrontThick = 3.0; // cm, Thickness of front Al layer
101 fGap2Active = 1.0; // cm, Gap between Al and 1st Scintillator
102 }
103 else if ( name == "G56_2_55_19" || name == "EMCAL_5655_21" ) {
104 fPRPbRadThickness = 0.5; // cm, Thickness of the Pb radiators for the preshower section
105 fPRScintThick = 0.6; // cm, Thickness of the sintilator for the preshower section of the tower
106 fNPRLayers = 2; // number of scintillator layers in the preshower section
107
108 fECPbRadThickness = 0.5; // cm, Thickness of the Pb radiators for the EM calorimeter section
109 fECScintThick = 0.5; // cm, Thickness of the sintilator for the EM alorimeter section of the tower
110 fNECLayers = 19; // number of scintillator layers in the EM calorimeter section
111
112 fHCCuRadThickness = 0.0; // cm, Thickness of the Cu radiators.
113 fHCScintThick = 0.0; // cm, Thickness of the sintilator for the hadronic alorimeter section of the tower
114 fNHCLayers = 0; // number of scintillator layers in the hadronic calorimeter section
115
116 fSampling = 12. ;
117 fSummationFraction = 0.8 ;
118
119 fAlFrontThick = 3.0; // cm, Thickness of front Al layer
120 fGap2Active = 1.0; // cm, Gap between Al and 1st Scintillator
121 }
122 else if ( name == "G65_2_64_19" || name == "EMCAL_6564_21" ) {
123 fPRPbRadThickness = 0.6; // cm, Thickness of the Pb radiators for the preshower section
124 fPRScintThick = 0.5; // cm, Thickness of the sintilator for the preshower section of the tower
125 fNPRLayers = 2; // number of scintillator layers in the preshower section
126
127 fECPbRadThickness = 0.6; // cm, Thickness of the Pb radiators for the EM calorimeter section
128 fECScintThick = 0.4; // cm, Thickness of the sintilator for the EM alorimeter section of the tower
129 fNECLayers = 19; // number of scintillator layers in the EM calorimeter section
130
131 fHCCuRadThickness = 0.0; // cm, Thickness of the Cu radiators.
132 fHCScintThick = 0.0; // cm, Thickness of the sintilator for the hadronic alorimeter section of the tower
133 fNHCLayers = 0; // number of scintillator layers in the hadronic calorimeter section
134
135 fSampling = 12. ;
136 fSummationFraction = 0.8 ;
137
138 fAlFrontThick = 3.0; // cm, Thickness of front Al layer
139 fGap2Active = 1.0; // cm, Gap between Al and 1st Scintillator
140 }
141 else
142 Fatal("Init", "%s is an undefined geometry!", name.Data()) ;
05a92d59 143
395c7ba2 144 // if( name != "EMCALArch1a" &&
145// name != "EMCALArch1b" &&
146// name != "EMCALArch2a" &&
147// name != "EMCALArch2b" &&
148// name != "EMCALArch1aN" ){
149// Fatal("Init", "%s is not a known geometry (choose among EMCALArch1a, EMCALArch1b, EMCALArch2a and EMCALArch2b, EMCALArch1aN)", name.Data()) ;
150// } // end if
151// //
152// if ( name == "EMCALArch1a" ||
153// name == "EMCALArch1b" ||
154// name == "EMCALArch1aN") {
155// fNZ = 96;
156// fNPhi = 144;
157// } // end if
158// if ( name == "EMCALArch2a" ||
159// name == "EMCALArch2b" ) {
160// fNZ = 112;
161// fNPhi = 168;
162// } // end if
163// if ( name == "EMCALArch1a" ||
164// name == "EMCALArch2a" ) {
165// fNPRLayers = 2;
166// fNECLayers = 19;
167// fNHCLayers = 0;
168// } // end if
169// if ( name == "EMCALArch1b" ||
170// name == "EMCALArch2b" ) {
171// fNPRLayers = 2;
172// fNECLayers = 23;
173// fNHCLayers = 0;
174// } // end if
175// if ( name == "EMCALArch1aN") {
176// fNPRLayers = 2;
177// fNECLayers = 19;
178// fNHCLayers = 14;
179// }
180
181 // geometry
182 fNZ = 96; // granularity along Z (eta)
183 fNPhi = 144; // granularity in phi (azimuth)
184 fArm1PhiMin = 60.0; // degrees, Starting EMCAL Phi position
185 fArm1PhiMax = 180.0; // degrees, Ending EMCAL Phi position
186 fArm1EtaMin = -0.7; // pseudorapidity, Starting EMCAL Eta position
187 fArm1EtaMax = +0.7; // pseudorapidity, Ending EMCAL Eta position
188
189 fIPDistance = 454.0; // cm, Radial distance to inner surface of EMCAL
190 fShellThickness = fAlFrontThick + fGap2Active + 2.*(GetPRScintThick() + GetPRPbRadThick()) + // pre shower
191 (fNECLayers-1)*(GetECScintThick()+ GetECPbRadThick()) + // E cal -1 because the last element is a scintillator
192 fNHCLayers*(GetHCScintThick()+ GetHCCuRadThick()) + // H cal
193 GetHCScintThick() ; // last scintillator
194 fZLength = 2.*ZFromEtaR(fIPDistance+fShellThickness,fArm1EtaMax); // Z coverage
195 fEnvelop[0] = fIPDistance; // mother volume inner radius
196 fEnvelop[1] = fIPDistance + fShellThickness; // mother volume outer r.
197 fEnvelop[2] = 1.00001*fZLength; // add some padding for mother volume.
198
199 fgInit = kTRUE;
200
201 Info("Init", "geometry of EMCAL named %s is as follows:", name.Data());
202 printf( "Tower geometry pre-shower: %d x (%f mm Pb, %f mm Sc) \n", GetNPRLayers(), GetPRPbRadThick(), GetPRScintThick() ) ;
203 printf( " ECAL : %d x (%f mm Pb, %f mm Sc) \n", GetNECLayers(), GetECPbRadThick(), GetECScintThick() ) ;
204 if ( GetNHCLayers() > 0 )
205 printf( " HCAL : %d x (%f mm Pb, %f mm Sc) \n", GetNHCLayers(), GetHCCuRadThick(), GetHCScintThick() ) ;
206 printf("Granularity: %d in eta and %d in phi\n", GetNZ(), GetNPhi()) ;
207 printf("Layout: phi = (%f, %f), eta = (%f, %f), y = %f\n",
208 GetArm1PhiMin(), GetArm1PhiMax(),GetArm1EtaMin(), GetArm1EtaMax(), GetIPDistance() ) ;
2012850d 209}
173558f2 210
b13bbe81 211//______________________________________________________________________
212AliEMCALGeometry * AliEMCALGeometry::GetInstance(){
05a92d59 213 // Returns the pointer of the unique instance
214
215 return static_cast<AliEMCALGeometry *>( fgGeom ) ;
2012850d 216}
173558f2 217
b13bbe81 218//______________________________________________________________________
219AliEMCALGeometry* AliEMCALGeometry::GetInstance(const Text_t* name,
220 const Text_t* title){
221 // Returns the pointer of the unique instance
222
223 AliEMCALGeometry * rv = 0;
224 if ( fgGeom == 0 ) {
225 if ( strcmp(name,"") == 0 ) rv = 0;
226 else {
227 fgGeom = new AliEMCALGeometry(name, title);
228 if ( fgInit ) rv = (AliEMCALGeometry * ) fgGeom;
229 else {
230 rv = 0;
231 delete fgGeom;
232 fgGeom = 0;
233 } // end if fgInit
234 } // end if strcmp(name,"")
235 }else{
236 if ( strcmp(fgGeom->GetName(), name) != 0 ) {
9859bfc0 237 TString message("\n") ;
238 message += "current geometry is " ;
239 message += fgGeom->GetName() ;
240 message += "\n you cannot call " ;
241 message += name ;
242 ::Info("GetGeometry", message.Data() ) ;
b13bbe81 243 }else{
9859bfc0 244 rv = (AliEMCALGeometry *) fgGeom;
b13bbe81 245 } // end if
246 } // end if fgGeom
247 return rv;
2012850d 248}
173558f2 249
ca8f5bd0 250//______________________________________________________________________
395c7ba2 251Int_t AliEMCALGeometry::TowerIndex(Int_t ieta,Int_t iphi) const {
252 // Returns the tower index number from the based on the Z and Phi
253 // index numbers. There are 2 times the number of towers to separate
254 // out the full towers from the pre-showers.
255 // Inputs:
256 // Int_t ieta // index allong z axis [1-fNZ]
257 // Int_t iphi // index allong phi axis [1-fNPhi]
258 // Int_t where // 1 = PRE section, 0 = EC section, 2 = HC section
259 // Outputs:
260 // none.
261 // Returned
262 // Int_t index // Tower index number
263
264 if ( (ieta <= 0 || ieta>GetNEta()) ||
265 (iphi <= 0 || iphi>GetNPhi()))
266 Fatal("TowerIndex", "Unexpected parameters eta = %d phi = %d!", ieta, iphi) ;
267
268 return ( (iphi - 1)*GetNEta() + ieta );
ca8f5bd0 269}
173558f2 270
ca8f5bd0 271//______________________________________________________________________
e908f07f 272void AliEMCALGeometry::TowerIndexes(Int_t index,Int_t &ieta,Int_t &iphi,
a34b7b9f 273 Int_t &ipre) const {
395c7ba2 274 // Inputs:
275 // Int_t index // Tower index number [1-i*fNZ*fNPhi] PRE(i=1)/ECAL(i=2)/HCAL(i=3)
276 // Outputs:
277 // Int_t ieta // index allong z axis [1-fNZ]
278 // Int_t iphi // index allong phi axis [1-fNPhi]
279 // Int_t ipre // 0 = ECAL section, 1 = Pre-shower section, 2 = HCAL section
280 // Returned
281 // none.
282
283
284 Int_t nindex = 0, itowers = GetNEta() * GetNPhi();
285
286 if ( IsInPRE(index) ) { // PRE index
287 nindex = index - itowers;
288 ipre = 1 ;
289 }
290 else if ( IsInECAL(index) ) { // ECAL index
291 nindex = index ;
292 ipre = 0 ;
293 }
294 else if ( IsInHCAL(index) ) { // HCAL index
295 nindex = index - 2*itowers;
296 ipre = 2 ;
297 }
298 else
299 Fatal("TowerIndexes", "Unexpected Id number!") ;
300
301 if (nindex%GetNZ())
302 iphi = nindex / GetNZ() + 1 ;
303 else
304 iphi = nindex / GetNZ() ;
305 ieta = nindex - (iphi - 1) * GetNZ() ;
306
307 if (gDebug==2)
308 Info("TowerIndexes", "index=%d,%d, ieta=%d, iphi = %d", index, nindex,ieta, iphi) ;
309 return;
310
ca8f5bd0 311}
173558f2 312
ca8f5bd0 313//______________________________________________________________________
a34b7b9f 314void AliEMCALGeometry::EtaPhiFromIndex(Int_t index,Float_t &eta,Float_t &phi) const {
ca8f5bd0 315 // given the tower index number it returns the based on the eta and phi
316 // of the tower.
317 // Inputs:
395c7ba2 318 // Int_t index // Tower index number [1-i*fNZ*fNPhi] PRE(i=1)/ECAL(i=2)/HCAL(i=3)
ca8f5bd0 319 // Outputs:
320 // Float_t eta // eta of center of tower in pseudorapidity
321 // Float_t phi // phi of center of tower in degrees
322 // Returned
323 // none.
395c7ba2 324 Int_t ieta, iphi, ipre ;
325 Float_t deta, dphi ;
ca8f5bd0 326
e908f07f 327 TowerIndexes(index,ieta,iphi,ipre);
395c7ba2 328
329 if (gDebug == 2)
330 Info("EtaPhiFromIndex","index = %d, ieta = %d, iphi = %d", index, ieta, iphi) ;
331
332 deta = (GetArm1EtaMax()-GetArm1EtaMin())/(static_cast<Float_t>(GetNEta()));
333 eta = GetArm1EtaMin() + ((static_cast<Float_t>(ieta) - 0.5 ))*deta;
334
335 dphi = (GetArm1PhiMax() - GetArm1PhiMin())/(static_cast<Float_t>(GetNPhi())); // in degrees.
336 phi = GetArm1PhiMin() + dphi*(static_cast<Float_t>(iphi) - 0.5);//iphi range [1-fNphi].
ca8f5bd0 337}
173558f2 338
ca8f5bd0 339//______________________________________________________________________
a34b7b9f 340Int_t AliEMCALGeometry::TowerIndexFromEtaPhi(Float_t eta,Float_t phi) const {
ca8f5bd0 341 // returns the tower index number based on the eta and phi of the tower.
342 // Inputs:
343 // Float_t eta // eta of center of tower in pseudorapidity
344 // Float_t phi // phi of center of tower in degrees
345 // Outputs:
346 // none.
347 // Returned
348 // Int_t index // Tower index number [1-fNZ*fNPhi]
395c7ba2 349
e908f07f 350 Int_t ieta,iphi;
ca8f5bd0 351
395c7ba2 352 ieta = static_cast<Int_t> ( 1 + (static_cast<Float_t>(GetNEta()) * (eta - GetArm1EtaMin()) / (GetArm1EtaMax() - GetArm1EtaMin())) ) ;
353
354 if( ieta <= 0 || ieta > GetNEta() ) {
355 Error("TowerIndexFromEtaPhi", "Unexpected (eta, phi) = (%f, %f) value, outside of EMCAL!", eta, phi) ;
356 return -1 ;
357 }
358
359 iphi = static_cast<Int_t> ( 1 + (static_cast<Float_t>(GetNPhi()) * (phi - GetArm1PhiMin()) / (GetArm1PhiMax() - GetArm1PhiMin())) ) ;
360
361 if( iphi <= 0 || iphi > GetNPhi() ) {
362 Error("TowerIndexFromEtaPhi", "Unexpected (eta, phi) = (%f, %f) value, outside of EMCAL!", eta, phi) ;
363 return -1 ;
364 }
365
366 return TowerIndex(ieta,iphi);
ca8f5bd0 367}
173558f2 368
ca8f5bd0 369//______________________________________________________________________
a34b7b9f 370Int_t AliEMCALGeometry::PreTowerIndexFromEtaPhi(Float_t eta,Float_t phi) const {
ca8f5bd0 371 // returns the pretower index number based on the eta and phi of the tower.
372 // Inputs:
373 // Float_t eta // eta of center of tower in pseudorapidity
374 // Float_t phi // phi of center of tower in degrees
375 // Outputs:
376 // none.
377 // Returned
378 // Int_t index // PreTower index number [fNZ*fNPhi-2*fNZ*fNPhi]
379
e908f07f 380 return GetNEta()*GetNPhi()+TowerIndexFromEtaPhi(eta,phi);
ca8f5bd0 381}
173558f2 382
ca8f5bd0 383//______________________________________________________________________
a34b7b9f 384Bool_t AliEMCALGeometry::AbsToRelNumbering(Int_t AbsId, Int_t *relid) const {
ca8f5bd0 385 // Converts the absolute numbering into the following array/
5a9318ff 386 // relid[0] = EMCAL Arm number 1:1
395c7ba2 387 // relid[1] = 0 ECAL section ; = 1 PRE section; = 2 HCA section
ca8f5bd0 388 // relid[2] = Row number inside EMCAL
389 // relid[3] = Column number inside EMCAL
390 // Input:
391 // Int_t AbsId // Tower index number [1-2*fNZ*fNPhi]
392 // Outputs:
393 // Int_t *relid // array of 5. Discribed above.
394 Bool_t rv = kTRUE ;
e908f07f 395 Int_t ieta=0,iphi=0,ipre=0,index=AbsId;
ca8f5bd0 396
e908f07f 397 TowerIndexes(index,ieta,iphi,ipre);
ca8f5bd0 398 relid[0] = 1;
395c7ba2 399 relid[1] = ipre;
e908f07f 400 relid[2] = ieta;
ca8f5bd0 401 relid[3] = iphi;
402
403 return rv;
404}
173558f2 405
ca8f5bd0 406//______________________________________________________________________
395c7ba2 407void AliEMCALGeometry::PosInAlice(const Int_t *relid, Float_t &theta, Float_t &phi) const
408{
409 // Converts the relative numbering into the local EMCAL-module (x, z)
410 // coordinates
411 Int_t sect = relid[1]; // PRE/ECAL/HCAL section 1/0/2
412 Int_t ieta = relid[2]; // offset along x axis
413 Int_t iphi = relid[3]; // offset along z axis
414 Int_t index;
415 Float_t eta;
416
417 index = TowerIndex(ieta,iphi);
418 EtaPhiFromIndex(index,eta,phi);
419 theta = 180.*(2.0*TMath::ATan(TMath::Exp(-eta)))/TMath::Pi();
420
421 // correct for distance to IP different in PRE/ECAL/HCAL
422 Float_t d = 0. ;
423 if (sect == 1)
424 d = GetIP2PRESection() - GetIPDistance() ;
425 else if (sect == 0)
426 d = GetIP2ECALSection() - GetIPDistance() ;
427 else if (sect == 2)
428 d = GetIP2HCALSection() - GetIPDistance() ;
429 else
430 Fatal("PosInAlice", "Unexpected tower section!") ;
431
432 Float_t correction = 1 + d/GetIPDistance() ;
433 Float_t tantheta = TMath::Tan(theta) * correction ;
434 theta = TMath::ATan(tantheta) * TMath::RadToDeg() ;
435 if (theta < 0 )
436 theta += 180. ;
437
438 return;
439}
ca8f5bd0 440
395c7ba2 441//______________________________________________________________________
442void AliEMCALGeometry::PosInAlice(const Int_t absid, Float_t &theta, Float_t &phi) const
443{
444 // Converts the relative numbering into the local EMCAL-module (x, z)
445 // coordinates
446
447 Int_t relid[4] ;
448 AbsToRelNumbering(absid, relid) ;
449 Int_t ieta = relid[2]; // offset along x axis
450 Int_t iphi = relid[3]; // offset along z axis
451 Int_t index;
452 Float_t eta;
453
454 index = TowerIndex(ieta,iphi);
455 EtaPhiFromIndex(index,eta,phi);
456 theta = 2.0*TMath::ATan(TMath::Exp(-eta)) ;
457
458 // correct for distance to IP different in PRE/ECAL/HCAL
459 Float_t d = 0. ;
460 if (IsInPRE(absid))
461 d = GetIP2PRESection() - GetIPDistance() ;
462 else if (IsInECAL(absid))
463 d = GetIP2ECALSection() - GetIPDistance() ;
464 else if (IsInHCAL(absid))
465 d = GetIP2HCALSection() - GetIPDistance() ;
466 else
467 Fatal("PosInAlice", "Unexpected id # %d!", absid) ;
468
469 Float_t correction = 1 + d/GetIPDistance() ;
470 Float_t tantheta = TMath::Tan(theta) * correction ;
471 theta = TMath::ATan(tantheta) * TMath::RadToDeg() ;
472 if (theta < 0 )
473 theta += 180. ;
474
475 return;
ca8f5bd0 476}
6119e5db 477
478//______________________________________________________________________
479void AliEMCALGeometry::XYZFromIndex(const Int_t *relid,Float_t &x,Float_t &y, Float_t &z) const {
480 // given the tower relative number it returns the X, Y and Z
481 // of the tower.
482
483 // Outputs:
484 // Float_t x // x of center of tower in cm
485 // Float_t y // y of center of tower in cm
486 // Float_t z // z of centre of tower in cm
487 // Returned
488 // none.
489
395c7ba2 490 Float_t eta,theta, phi,cyl_radius=0. ;
6119e5db 491
492 Int_t ieta = relid[2]; // offset along x axis
493 Int_t iphi = relid[3]; // offset along z axis
395c7ba2 494 Int_t ipre = relid[1]; // indicates 0 ECAL section, 1 PRE section, 2 HCAL section.
6119e5db 495 Int_t index;
496
395c7ba2 497 index = TowerIndex(ieta,iphi);
6119e5db 498 EtaPhiFromIndex(index,eta,phi);
499 theta = 180.*(2.0*TMath::ATan(TMath::Exp(-eta)))/TMath::Pi();
6119e5db 500
395c7ba2 501 if ( ipre == 0 )
502 cyl_radius = GetIP2ECALSection() ;
503 else if ( ipre == 1 )
504 cyl_radius = GetIP2PRESection() ;
505 else if ( ipre == 2 )
506 cyl_radius = GetIP2HCALSection() ;
a97849a9 507 else
395c7ba2 508 Fatal("XYZFromIndex", "Unexpected Tower section # %d", ipre) ;
a97849a9 509
395c7ba2 510 Double_t kDeg2Rad = TMath::DegToRad() ;
6119e5db 511 x = cyl_radius * TMath::Cos(phi * kDeg2Rad ) ;
f6eaf97a 512 y = cyl_radius * TMath::Sin(phi * kDeg2Rad ) ;
6119e5db 513 z = cyl_radius / TMath::Tan(theta * kDeg2Rad ) ;
514
515 return;
516}
517
ca8f5bd0 518//______________________________________________________________________
395c7ba2 519void AliEMCALGeometry::XYZFromIndex(const Int_t absid, TVector3 &v) const {
520 // given the tower relative number it returns the X, Y and Z
521 // of the tower.
522
523 // Outputs:
524 // Float_t x // x of center of tower in cm
525 // Float_t y // y of center of tower in cm
526 // Float_t z // z of centre of tower in cm
527 // Returned
528 // none.
529
530 Float_t theta, phi,cyl_radius=0. ;
531
532 PosInAlice(absid, theta, phi) ;
533
534 if ( IsInECAL(absid) )
535 cyl_radius = GetIP2ECALSection() ;
536 else if ( IsInPRE(absid) )
537 cyl_radius = GetIP2PRESection() ;
538 else if ( IsInHCAL(absid) )
539 cyl_radius = GetIP2HCALSection() ;
540 else
541 Fatal("XYZFromIndex", "Unexpected Tower section") ;
542
543 Double_t kDeg2Rad = TMath::DegToRad() ;
544 v.SetX(cyl_radius * TMath::Cos(phi * kDeg2Rad ) );
545 v.SetY(cyl_radius * TMath::Sin(phi * kDeg2Rad ) );
546 v.SetZ(cyl_radius / TMath::Tan(theta * kDeg2Rad ) ) ;
547
548 return;
549}
550
551//______________________________________________________________________
ca8f5bd0 552/*
a34b7b9f 553Boot_t AliEMCALGeometry::AreNeighbours(Int_t index1,Int_t index2) const {
ca8f5bd0 554 // Returns kTRUE if the two towers are neighbours or not, including
555 // diagonals. Both indexes are required to be either towers or preshower.
556 // Inputs:
557 // Int_t index1 // index of tower 1
558 // Int_t index2 // index of tower 2
559 // Outputs:
560 // none.
561 // Returned
562 // Boot_t kTRUE if the towers are neighbours otherwise false.
563 Boot_t anb = kFALSE;
e908f07f 564 Int_t ieta1 = 0, ieta2 = 0, iphi1 = 0, iphi2 = 0, ipre1 = 0, ipre2 = 0;
ca8f5bd0 565
e908f07f 566 TowerIndexes(index1,ieta1,iphi1,ipre1);
567 TowerIndexes(index2,ieta2,iphi2,ipre2);
ca8f5bd0 568 if(ipre1!=ipre2) return anb;
e908f07f 569 if((ieta1>=ieta2-1 && ieta1<=ieta2+1) && (iphi1>=iphi2-1 &&iphi1<=iphi2+1))
ca8f5bd0 570 anb = kTRUE;
571 return anb;
572}
573 */