Recalculated sampling fraction, with the addition of Birks' Law
[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
b13bbe81 26//*-- Author: Sahal Yacoob (LBL / UCT)
27// and : Yves Schutz (SUBATECH)
28// and : Jennifer Klay (LBL)
2012850d 29
2012850d 30// --- AliRoot header files ---
ca8f5bd0 31#include <TMath.h>
116cbefd 32#include <TVector3.h>
173558f2 33
ca8f5bd0 34// -- ALICE Headers.
d64c959b 35//#include "AliConst.h"
173558f2 36
ca8f5bd0 37// --- EMCAL headers
38#include "AliEMCALGeometry.h"
2012850d 39
b13bbe81 40ClassImp(AliEMCALGeometry);
2012850d 41
b13bbe81 42AliEMCALGeometry *AliEMCALGeometry::fgGeom = 0;
43Bool_t AliEMCALGeometry::fgInit = kFALSE;
2012850d 44
b13bbe81 45//______________________________________________________________________
46AliEMCALGeometry::~AliEMCALGeometry(void){
47 // dtor
2012850d 48}
b13bbe81 49
395c7ba2 50//______________________________________________________________________
09884213 51Bool_t AliEMCALGeometry::AreInSameTower(Int_t id1, Int_t id2) const {
fdebddeb 52 // Find out whether two hits are in the same tower
395c7ba2 53 Int_t idmax = TMath::Max(id1, id2) ;
54 Int_t idmin = TMath::Min(id1, id2) ;
55 if ( ((idmax - GetNZ() * GetNPhi()) == idmin ) ||
56 ((idmax - 2 * GetNZ() * GetNPhi()) == idmin ) )
57 return kTRUE ;
58 else
59 return kFALSE ;
60}
05a92d59 61
395c7ba2 62//______________________________________________________________________
63void AliEMCALGeometry::Init(void){
64 // Initializes the EMCAL parameters
fdebddeb 65 // naming convention : GUV_WX_N_ gives the composition of a tower
395c7ba2 66 // WX inform about the composition of the EM calorimeter section:
fdebddeb 67 // thickness in mm of Pb radiator (W) and of scintillator (X), and number of scintillator layers (N)
68 // New geometry: EMCAL_55_25
395c7ba2 69
fdebddeb 70 fgInit = kFALSE; // Assume failed until proven otherwise.
71 TString name(GetName()) ;
72 if (name == "EMCAL_55_25") {
73 fECPbRadThickness = 0.5; // cm, Thickness of the Pb radiators
74 fECScintThick = 0.5; // cm, Thickness of the scintillator
75 fNECLayers = 25; // number of scintillator layers
395c7ba2 76
57c473a6 77 fSampling = 13.1; // calculated with Birk's law implementation
395c7ba2 78
fdebddeb 79 fAlFrontThick = 3.5; // cm, Thickness of front Al layer
395c7ba2 80 fGap2Active = 1.0; // cm, Gap between Al and 1st Scintillator
81 }
fdebddeb 82 else if( name == "G56_2_55_19" || name == "EMCAL_5655_21" || name == "G56_2_55_19_104_14"|| name == "G65_2_64_19" || name == "EMCAL_6564_21"){
83 Fatal("Init", "%s is an old geometry! Please update your Config file", name.Data()) ;
395c7ba2 84 }
85 else
86 Fatal("Init", "%s is an undefined geometry!", name.Data()) ;
05a92d59 87
395c7ba2 88 // geometry
fdebddeb 89 fNZ = 114; // granularity along Z (eta)
90 fNPhi = 168; // granularity in phi (azimuth)
91 fArm1PhiMin = 60.0; // degrees, Starting EMCAL Phi position
92 fArm1PhiMax = 180.0; // degrees, Ending EMCAL Phi position
93 fArm1EtaMin = -0.7; // pseudorapidity, Starting EMCAL Eta position
94 fArm1EtaMax = +0.7; // pseudorapidity, Ending EMCAL Eta position
395c7ba2 95
96 fIPDistance = 454.0; // cm, Radial distance to inner surface of EMCAL
fdebddeb 97
98 //There is always one more scintillator than radiator layer because of the first block of aluminium
99 fShellThickness = fAlFrontThick + fGap2Active + fNECLayers*GetECScintThick()+(fNECLayers-1)*GetECPbRadThick();
100
395c7ba2 101 fZLength = 2.*ZFromEtaR(fIPDistance+fShellThickness,fArm1EtaMax); // Z coverage
102 fEnvelop[0] = fIPDistance; // mother volume inner radius
103 fEnvelop[1] = fIPDistance + fShellThickness; // mother volume outer r.
104 fEnvelop[2] = 1.00001*fZLength; // add some padding for mother volume.
105
106 fgInit = kTRUE;
107
88cb7938 108 if (gDebug) {
fdebddeb 109 printf("Init: geometry of EMCAL named %s is as follows:", name.Data());
88cb7938 110 printf( " ECAL : %d x (%f mm Pb, %f mm Sc) \n", GetNECLayers(), GetECPbRadThick(), GetECScintThick() ) ;
88cb7938 111 printf("Granularity: %d in eta and %d in phi\n", GetNZ(), GetNPhi()) ;
112 printf("Layout: phi = (%f, %f), eta = (%f, %f), y = %f\n",
113 GetArm1PhiMin(), GetArm1PhiMax(),GetArm1EtaMin(), GetArm1EtaMax(), GetIPDistance() ) ;
114 }
2012850d 115}
173558f2 116
b13bbe81 117//______________________________________________________________________
118AliEMCALGeometry * AliEMCALGeometry::GetInstance(){
05a92d59 119 // Returns the pointer of the unique instance
120
121 return static_cast<AliEMCALGeometry *>( fgGeom ) ;
2012850d 122}
173558f2 123
b13bbe81 124//______________________________________________________________________
125AliEMCALGeometry* AliEMCALGeometry::GetInstance(const Text_t* name,
126 const Text_t* title){
127 // Returns the pointer of the unique instance
128
129 AliEMCALGeometry * rv = 0;
130 if ( fgGeom == 0 ) {
131 if ( strcmp(name,"") == 0 ) rv = 0;
132 else {
133 fgGeom = new AliEMCALGeometry(name, title);
134 if ( fgInit ) rv = (AliEMCALGeometry * ) fgGeom;
135 else {
136 rv = 0;
137 delete fgGeom;
138 fgGeom = 0;
139 } // end if fgInit
140 } // end if strcmp(name,"")
141 }else{
142 if ( strcmp(fgGeom->GetName(), name) != 0 ) {
fdebddeb 143 printf("\ncurrent geometry is ") ;
144 printf(fgGeom->GetName());
145 printf("\n you cannot call ");
146 printf(name);
b13bbe81 147 }else{
9859bfc0 148 rv = (AliEMCALGeometry *) fgGeom;
b13bbe81 149 } // end if
150 } // end if fgGeom
151 return rv;
2012850d 152}
173558f2 153
ca8f5bd0 154//______________________________________________________________________
395c7ba2 155Int_t AliEMCALGeometry::TowerIndex(Int_t ieta,Int_t iphi) const {
156 // Returns the tower index number from the based on the Z and Phi
fdebddeb 157 // index numbers.
395c7ba2 158 // Inputs:
fdebddeb 159 // Int_t ieta // index along z axis [1-fNZ]
160 // Int_t iphi // index along phi axis [1-fNPhi]
395c7ba2 161 // Outputs:
162 // none.
163 // Returned
164 // Int_t index // Tower index number
165
166 if ( (ieta <= 0 || ieta>GetNEta()) ||
f1da4a27 167 (iphi <= 0 || iphi>GetNPhi())) {
168 Error("TowerIndex", "Unexpected parameters eta = %d phi = %d!", ieta, iphi) ;
169 return -1;
170 }
395c7ba2 171 return ( (iphi - 1)*GetNEta() + ieta );
ca8f5bd0 172}
173558f2 173
ca8f5bd0 174//______________________________________________________________________
fdebddeb 175void AliEMCALGeometry::TowerIndexes(Int_t index,Int_t &ieta,Int_t &iphi) const {
395c7ba2 176 // Inputs:
fdebddeb 177 // Int_t index // Tower index number [1-fNZ*fNPhi]
395c7ba2 178 // Outputs:
179 // Int_t ieta // index allong z axis [1-fNZ]
180 // Int_t iphi // index allong phi axis [1-fNPhi]
395c7ba2 181 // Returned
182 // none.
395c7ba2 183
fdebddeb 184 Int_t nindex = 0;
395c7ba2 185
fdebddeb 186 if ( IsInECA(index) ) { // ECAL index
395c7ba2 187 nindex = index ;
395c7ba2 188 }
f1da4a27 189 else {
190 Error("TowerIndexes", "Unexpected Id number!") ;
191 ieta = -1;
192 iphi = -1;
193 return;
194 }
195
395c7ba2 196 if (nindex%GetNZ())
197 iphi = nindex / GetNZ() + 1 ;
198 else
199 iphi = nindex / GetNZ() ;
200 ieta = nindex - (iphi - 1) * GetNZ() ;
201
202 if (gDebug==2)
fdebddeb 203 printf("TowerIndexes: index=%d,%d, ieta=%d, iphi = %d", index, nindex,ieta, iphi) ;
395c7ba2 204 return;
205
ca8f5bd0 206}
173558f2 207
ca8f5bd0 208//______________________________________________________________________
a34b7b9f 209void AliEMCALGeometry::EtaPhiFromIndex(Int_t index,Float_t &eta,Float_t &phi) const {
ca8f5bd0 210 // given the tower index number it returns the based on the eta and phi
211 // of the tower.
212 // Inputs:
fdebddeb 213 // Int_t index // Tower index number [1-fNZ*fNPhi]
ca8f5bd0 214 // Outputs:
215 // Float_t eta // eta of center of tower in pseudorapidity
216 // Float_t phi // phi of center of tower in degrees
217 // Returned
218 // none.
fdebddeb 219 Int_t ieta, iphi;
395c7ba2 220 Float_t deta, dphi ;
ca8f5bd0 221
fdebddeb 222 TowerIndexes(index,ieta,iphi);
395c7ba2 223
224 if (gDebug == 2)
fdebddeb 225 printf("EtaPhiFromIndex: index = %d, ieta = %d, iphi = %d", index, ieta, iphi) ;
395c7ba2 226
227 deta = (GetArm1EtaMax()-GetArm1EtaMin())/(static_cast<Float_t>(GetNEta()));
228 eta = GetArm1EtaMin() + ((static_cast<Float_t>(ieta) - 0.5 ))*deta;
229
230 dphi = (GetArm1PhiMax() - GetArm1PhiMin())/(static_cast<Float_t>(GetNPhi())); // in degrees.
231 phi = GetArm1PhiMin() + dphi*(static_cast<Float_t>(iphi) - 0.5);//iphi range [1-fNphi].
ca8f5bd0 232}
173558f2 233
ca8f5bd0 234//______________________________________________________________________
a34b7b9f 235Int_t AliEMCALGeometry::TowerIndexFromEtaPhi(Float_t eta,Float_t phi) const {
ca8f5bd0 236 // returns the tower index number based on the eta and phi of the tower.
237 // Inputs:
238 // Float_t eta // eta of center of tower in pseudorapidity
239 // Float_t phi // phi of center of tower in degrees
240 // Outputs:
241 // none.
242 // Returned
243 // Int_t index // Tower index number [1-fNZ*fNPhi]
395c7ba2 244
e908f07f 245 Int_t ieta,iphi;
ca8f5bd0 246
395c7ba2 247 ieta = static_cast<Int_t> ( 1 + (static_cast<Float_t>(GetNEta()) * (eta - GetArm1EtaMin()) / (GetArm1EtaMax() - GetArm1EtaMin())) ) ;
248
249 if( ieta <= 0 || ieta > GetNEta() ) {
250 Error("TowerIndexFromEtaPhi", "Unexpected (eta, phi) = (%f, %f) value, outside of EMCAL!", eta, phi) ;
251 return -1 ;
252 }
253
254 iphi = static_cast<Int_t> ( 1 + (static_cast<Float_t>(GetNPhi()) * (phi - GetArm1PhiMin()) / (GetArm1PhiMax() - GetArm1PhiMin())) ) ;
255
256 if( iphi <= 0 || iphi > GetNPhi() ) {
257 Error("TowerIndexFromEtaPhi", "Unexpected (eta, phi) = (%f, %f) value, outside of EMCAL!", eta, phi) ;
258 return -1 ;
259 }
260
261 return TowerIndex(ieta,iphi);
ca8f5bd0 262}
173558f2 263
ca8f5bd0 264//______________________________________________________________________
a34b7b9f 265Bool_t AliEMCALGeometry::AbsToRelNumbering(Int_t AbsId, Int_t *relid) const {
ca8f5bd0 266 // Converts the absolute numbering into the following array/
2608a1fc 267 // relid[0] = Row number inside EMCAL
268 // relid[1] = Column number inside EMCAL
ca8f5bd0 269 // Input:
270 // Int_t AbsId // Tower index number [1-2*fNZ*fNPhi]
271 // Outputs:
2608a1fc 272 // Int_t *relid // array of 2. Described above.
ca8f5bd0 273 Bool_t rv = kTRUE ;
fdebddeb 274 Int_t ieta=0,iphi=0,index=AbsId;
ca8f5bd0 275
fdebddeb 276 TowerIndexes(index,ieta,iphi);
2608a1fc 277 relid[0] = ieta;
278 relid[1] = iphi;
ca8f5bd0 279
280 return rv;
281}
173558f2 282
ca8f5bd0 283//______________________________________________________________________
395c7ba2 284void AliEMCALGeometry::PosInAlice(const Int_t *relid, Float_t &theta, Float_t &phi) const
285{
286 // Converts the relative numbering into the local EMCAL-module (x, z)
287 // coordinates
2608a1fc 288 Int_t ieta = relid[0]; // offset along x axis
289 Int_t iphi = relid[1]; // offset along z axis
395c7ba2 290 Int_t index;
291 Float_t eta;
292
293 index = TowerIndex(ieta,iphi);
294 EtaPhiFromIndex(index,eta,phi);
fdebddeb 295 //theta = 180.*(2.0*TMath::ATan(TMath::Exp(-eta)))/TMath::Pi();
296 theta = 2.0*TMath::ATan(TMath::Exp(-eta));
395c7ba2 297
fdebddeb 298 // correct for distance to IP
299 Float_t d = GetIP2ECASection() - GetIPDistance() ;
395c7ba2 300
301 Float_t correction = 1 + d/GetIPDistance() ;
302 Float_t tantheta = TMath::Tan(theta) * correction ;
303 theta = TMath::ATan(tantheta) * TMath::RadToDeg() ;
304 if (theta < 0 )
305 theta += 180. ;
306
307 return;
308}
ca8f5bd0 309
395c7ba2 310//______________________________________________________________________
09884213 311void AliEMCALGeometry::PosInAlice(Int_t absid, Float_t &theta, Float_t &phi) const
395c7ba2 312{
313 // Converts the relative numbering into the local EMCAL-module (x, z)
314 // coordinates
2608a1fc 315 Int_t relid[2] ;
395c7ba2 316 AbsToRelNumbering(absid, relid) ;
2608a1fc 317 Int_t ieta = relid[0]; // offset along x axis
318 Int_t iphi = relid[1]; // offset along z axis
395c7ba2 319 Int_t index;
320 Float_t eta;
321
322 index = TowerIndex(ieta,iphi);
323 EtaPhiFromIndex(index,eta,phi);
324 theta = 2.0*TMath::ATan(TMath::Exp(-eta)) ;
325
fdebddeb 326 // correct for distance to IP
395c7ba2 327 Float_t d = 0. ;
fdebddeb 328 if (IsInECA(absid))
88cb7938 329 d = GetIP2ECASection() - GetIPDistance() ;
f1da4a27 330 else {
331 Error("PosInAlice", "Unexpected id # %d!", absid) ;
332 return;
333 }
395c7ba2 334
335 Float_t correction = 1 + d/GetIPDistance() ;
336 Float_t tantheta = TMath::Tan(theta) * correction ;
337 theta = TMath::ATan(tantheta) * TMath::RadToDeg() ;
338 if (theta < 0 )
339 theta += 180. ;
340
341 return;
ca8f5bd0 342}
6119e5db 343
344//______________________________________________________________________
345void AliEMCALGeometry::XYZFromIndex(const Int_t *relid,Float_t &x,Float_t &y, Float_t &z) const {
346 // given the tower relative number it returns the X, Y and Z
347 // of the tower.
348
349 // Outputs:
350 // Float_t x // x of center of tower in cm
351 // Float_t y // y of center of tower in cm
352 // Float_t z // z of centre of tower in cm
353 // Returned
354 // none.
355
fdebddeb 356 Float_t eta,theta, phi,cylradius=0. ;
6119e5db 357
2608a1fc 358 Int_t ieta = relid[0]; // offset along x axis
359 Int_t iphi = relid[1]; // offset along z axis.
6119e5db 360 Int_t index;
361
395c7ba2 362 index = TowerIndex(ieta,iphi);
6119e5db 363 EtaPhiFromIndex(index,eta,phi);
364 theta = 180.*(2.0*TMath::ATan(TMath::Exp(-eta)))/TMath::Pi();
6119e5db 365
fdebddeb 366 cylradius = GetIP2ECASection() ;
a97849a9 367
395c7ba2 368 Double_t kDeg2Rad = TMath::DegToRad() ;
fdebddeb 369 x = cylradius * TMath::Cos(phi * kDeg2Rad ) ;
370 y = cylradius * TMath::Sin(phi * kDeg2Rad ) ;
371 z = cylradius / TMath::Tan(theta * kDeg2Rad ) ;
6119e5db 372
373 return;
374}
375
395c7ba2 376//______________________________________________________________________
09884213 377void AliEMCALGeometry::XYZFromIndex(Int_t absid, TVector3 &v) const {
395c7ba2 378 // given the tower relative number it returns the X, Y and Z
379 // of the tower.
380
381 // Outputs:
382 // Float_t x // x of center of tower in cm
383 // Float_t y // y of center of tower in cm
384 // Float_t z // z of centre of tower in cm
385 // Returned
386 // none.
387
fdebddeb 388 Float_t theta, phi,cylradius=0. ;
395c7ba2 389
390 PosInAlice(absid, theta, phi) ;
391
88cb7938 392 if ( IsInECA(absid) )
fdebddeb 393 cylradius = GetIP2ECASection() ;
f1da4a27 394 else {
395 Error("XYZFromIndex", "Unexpected Tower section") ;
396 return;
397 }
395c7ba2 398
399 Double_t kDeg2Rad = TMath::DegToRad() ;
fdebddeb 400 v.SetX(cylradius * TMath::Cos(phi * kDeg2Rad ) );
401 v.SetY(cylradius * TMath::Sin(phi * kDeg2Rad ) );
402 v.SetZ(cylradius / TMath::Tan(theta * kDeg2Rad ) ) ;
395c7ba2 403
404 return;
405}
ab37d09c 406
407Bool_t AliEMCALGeometry::IsInEMCAL(Double_t x, Double_t y, Double_t z) const {
408 // Checks whether point is inside the EMCal volume
409 //
410 // Code uses cylindrical approximation made of inner radius (for speed)
411 //
412 // Points behind EMCAl, i.e. R > outer radius, but eta, phi in acceptance
413 // are considered to inside
414
415 Double_t r=sqrt(x*x+y*y);
416
417 if ( r > fEnvelop[0] ) {
418 Double_t theta;
419 theta = TMath::ATan2(r,z);
420 Double_t eta;
421 if(theta == 0)
422 eta = 9999;
423 else
424 eta = -TMath::Log(TMath::Tan(theta/2.));
425 if (eta < fArm1EtaMin || eta > fArm1EtaMax)
426 return 0;
427
428 Double_t phi = TMath::ATan2(y,x) * 180./TMath::Pi();
429 if (phi > fArm1PhiMin && phi < fArm1PhiMax)
430 return 1;
431 }
432 return 0;
433}