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[u/mrichter/AliRoot.git] / PHOS / AliPHOSGeometry.cxx
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d15a28e7 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
b2a60966 16/* $Id$ */
17
d15a28e7 18//_________________________________________________________________________
b2a60966 19// Geometry class for PHOS : singleton
a3dfe79c 20// PHOS consists of the electromagnetic calorimeter (EMCA)
21// and a charged particle veto either in the Subatech's version (PPSD)
22// or in the IHEP's one (CPV).
23// The EMCA/PPSD/CPV modules are parametrized so that any configuration
24// can be easily implemented
25// The title is used to identify the version of CPV used.
b2a60966 26//
710f859a 27//*-- Author: Yves Schutz (SUBATECH) & Dmitri Peressounko (RRC "KI" & SUBATECH)
d15a28e7 28
29// --- ROOT system ---
30
31#include "TVector3.h"
32#include "TRotation.h"
fa7cce36 33#include "TFolder.h"
34#include "TROOT.h"
d15a28e7 35
36// --- Standard library ---
37
de9ec31b 38#include <iostream.h>
4410223b 39#include <stdlib.h>
d15a28e7 40
41// --- AliRoot header files ---
42
43#include "AliPHOSGeometry.h"
468794ea 44#include "AliPHOSEMCAGeometry.h"
710f859a 45#include "AliPHOSRecPoint.h"
d15a28e7 46#include "AliConst.h"
47
9ec91567 48ClassImp(AliPHOSGeometry) ;
d15a28e7 49
a4e98857 50// these initialisations are needed for a singleton
9ec91567 51AliPHOSGeometry * AliPHOSGeometry::fgGeom = 0 ;
282c5906 52Bool_t AliPHOSGeometry::fgInit = kFALSE ;
9ec91567 53
d15a28e7 54//____________________________________________________________________________
55AliPHOSGeometry::~AliPHOSGeometry(void)
56{
b2a60966 57 // dtor
58
52a36ffd 59 if (fRotMatrixArray) fRotMatrixArray->Delete() ;
60 if (fRotMatrixArray) delete fRotMatrixArray ;
fa0bc588 61 if (fPHOSAngle ) delete[] fPHOSAngle ;
52a36ffd 62}
52a36ffd 63//____________________________________________________________________________
64
65void AliPHOSGeometry::Init(void)
66{
a4e98857 67 // Initializes the PHOS parameters :
68 // IHEP is the Protvino CPV (cathode pad chambers)
69 // GPS2 is the Subatech Pre-Shower (two micromegas sandwiching a passive lead converter)
70 // MIXT 4 PHOS modules withe the IHEP CPV qnd one PHOS module with the Subatche Pre-Shower
710f859a 71
72 fgInit = kTRUE ;
73
74 fNModules = 5;
75 fAngle = 20;
76
77 fGeometryEMCA = new AliPHOSEMCAGeometry();
78
79 fGeometryCPV = new AliPHOSCPVGeometry ();
80
81 fGeometrySUPP = new AliPHOSSupportGeometry();
82
83 fPHOSAngle = new Float_t[fNModules] ;
84
85 Float_t * emcParams = fGeometryEMCA->GetEMCParams() ;
86
581e32d4 87 fPHOSParams[0] = TMath::Max((Double_t)fGeometryCPV->GetCPVBoxSize(0)/2.,
88 (Double_t)(emcParams[0]*(fGeometryCPV->GetCPVBoxSize(1)+emcParams[3]) -
710f859a 89 emcParams[1]* fGeometryCPV->GetCPVBoxSize(1))/emcParams[3] ) ;
90 fPHOSParams[1] = emcParams[1] ;
581e32d4 91 fPHOSParams[2] = TMath::Max((Double_t)emcParams[2], (Double_t)fGeometryCPV->GetCPVBoxSize(2)/2.);
710f859a 92 fPHOSParams[3] = emcParams[3] + fGeometryCPV->GetCPVBoxSize(1)/2. ;
93
94 fIPtoUpperCPVsurface = fGeometryEMCA->GetIPtoOuterCoverDistance() - fGeometryCPV->GetCPVBoxSize(1) ;
95
96 Int_t index ;
97 for ( index = 0; index < fNModules; index++ )
52a36ffd 98 fPHOSAngle[index] = 0.0 ; // Module position angles are set in CreateGeometry()
710f859a 99
100 this->SetPHOSAngles() ;
101 fRotMatrixArray = new TObjArray(fNModules) ;
102
52a36ffd 103}
104
5ccb0008 105
106//____________________________________________________________________________
52a36ffd 107AliPHOSGeometry * AliPHOSGeometry::GetInstance()
108{
a4e98857 109 // Returns the pointer of the unique instance; singleton specific
110
52a36ffd 111 return (AliPHOSGeometry *) fgGeom ;
112}
113
114//____________________________________________________________________________
115AliPHOSGeometry * AliPHOSGeometry::GetInstance(const Text_t* name, const Text_t* title)
116{
117 // Returns the pointer of the unique instance
a4e98857 118 // Creates it with the specified options (name, title) if it does not exist yet
119
52a36ffd 120 AliPHOSGeometry * rv = 0 ;
121 if ( fgGeom == 0 ) {
122 if ( strcmp(name,"") == 0 )
123 rv = 0 ;
124 else {
125 fgGeom = new AliPHOSGeometry(name, title) ;
126 if ( fgInit )
127 rv = (AliPHOSGeometry * ) fgGeom ;
128 else {
129 rv = 0 ;
130 delete fgGeom ;
131 fgGeom = 0 ;
132 }
133 }
134 }
135 else {
136 if ( strcmp(fgGeom->GetName(), name) != 0 ) {
137 cout << "AliPHOSGeometry <E> : current geometry is " << fgGeom->GetName() << endl
138 << " you cannot call " << name << endl ;
139 }
140 else
141 rv = (AliPHOSGeometry *) fgGeom ;
142 }
143 return rv ;
144}
4697edca 145
52a36ffd 146//____________________________________________________________________________
147void AliPHOSGeometry::SetPHOSAngles()
148{
a4e98857 149 // Calculates the position of the PHOS modules in ALICE global coordinate system
52a36ffd 150
151 Double_t const kRADDEG = 180.0 / kPI ;
710f859a 152 Float_t pphi = 2 * TMath::ATan( GetOuterBoxSize(0) / ( 2.0 * GetIPtoUpperCPVsurface() ) ) ;
52a36ffd 153 pphi *= kRADDEG ;
710f859a 154 if (pphi > fAngle){
155 cout << "AliPHOSGeometry: PHOS modules overlap!\n";
156 cout << "pphi = " << pphi << " fAngle " << fAngle << endl ;
157
158 }
ed4205d8 159 pphi = fAngle;
52a36ffd 160
161 for( Int_t i = 1; i <= fNModules ; i++ ) {
ed4205d8 162 Float_t angle = pphi * ( i - fNModules / 2.0 - 0.5 ) ;
52a36ffd 163 fPHOSAngle[i-1] = - angle ;
164 }
d15a28e7 165}
166
167//____________________________________________________________________________
7b7c1533 168Bool_t AliPHOSGeometry::AbsToRelNumbering(const Int_t AbsId, Int_t * relid) const
d15a28e7 169{
b2a60966 170 // Converts the absolute numbering into the following array/
171 // relid[0] = PHOS Module number 1:fNModules
172 // relid[1] = 0 if PbW04
710f859a 173 // = -1 if CPV
174 // relid[2] = Row number inside a PHOS module
175 // relid[3] = Column number inside a PHOS module
d15a28e7 176
177 Bool_t rv = kTRUE ;
92862013 178 Float_t id = AbsId ;
d15a28e7 179
710f859a 180 Int_t phosmodulenumber = (Int_t)TMath:: Ceil( id / GetNCristalsInModule() ) ;
d15a28e7 181
710f859a 182 if ( phosmodulenumber > GetNModules() ) { // it is a CPV pad
183
184 id -= GetNPhi() * GetNZ() * GetNModules() ;
185 Float_t nCPV = GetNumberOfCPVPadsPhi() * GetNumberOfCPVPadsZ() ;
186 relid[0] = (Int_t) TMath::Ceil( id / nCPV ) ;
187 relid[1] = -1 ;
188 id -= ( relid[0] - 1 ) * nCPV ;
189 relid[2] = (Int_t) TMath::Ceil( id / GetNumberOfCPVPadsZ() ) ;
190 relid[3] = (Int_t) ( id - ( relid[2] - 1 ) * GetNumberOfCPVPadsZ() ) ;
d15a28e7 191 }
710f859a 192 else { // it is a PW04 crystal
d15a28e7 193
92862013 194 relid[0] = phosmodulenumber ;
195 relid[1] = 0 ;
196 id -= ( phosmodulenumber - 1 ) * GetNPhi() * GetNZ() ;
710f859a 197 relid[2] = (Int_t)TMath::Ceil( id / GetNZ() ) ;
198 relid[3] = (Int_t)( id - ( relid[2] - 1 ) * GetNZ() ) ;
d15a28e7 199 }
200 return rv ;
201}
52a36ffd 202
9f616d61 203//____________________________________________________________________________
7b7c1533 204void AliPHOSGeometry::EmcModuleCoverage(const Int_t mod, Double_t & tm, Double_t & tM, Double_t & pm, Double_t & pM, Option_t * opt) const
9f616d61 205{
a4e98857 206 // calculates the angular coverage in theta and phi of one EMC (=PHOS) module
9f616d61 207
208 Double_t conv ;
cf0c2bc1 209 if ( opt == Radian() )
9f616d61 210 conv = 1. ;
cf0c2bc1 211 else if ( opt == Degre() )
9f616d61 212 conv = 180. / TMath::Pi() ;
213 else {
214 cout << "<I> AliPHOSGeometry::EmcXtalCoverage : " << opt << " unknown option; result in radian " << endl ;
215 conv = 1. ;
216 }
217
710f859a 218 Float_t phi = GetPHOSAngle(mod) * (TMath::Pi() / 180.) ;
219 Float_t y0 = GetIPtoCrystalSurface() ;
220 Float_t * strip = fGeometryEMCA->GetStripHalfSize() ;
221 Float_t x0 = fGeometryEMCA->GetNStripX()*strip[0] ;
222 Float_t z0 = fGeometryEMCA->GetNStripZ()*strip[2] ;
223 Double_t angle = TMath::ATan( x0 / y0 ) ;
224 phi = phi + 1.5 * TMath::Pi() ; // to follow the convention of the particle generator(PHOS is between 220 and 320 deg.)
92862013 225 Double_t max = phi - angle ;
226 Double_t min = phi + angle ;
227 pM = TMath::Max(max, min) * conv ;
228 pm = TMath::Min(max, min) * conv ;
9f616d61 229
710f859a 230 angle = TMath::ATan( z0 / y0 ) ;
92862013 231 max = TMath::Pi() / 2. + angle ; // to follow the convention of the particle generator(PHOS is at 90 deg.)
232 min = TMath::Pi() / 2. - angle ;
233 tM = TMath::Max(max, min) * conv ;
234 tm = TMath::Min(max, min) * conv ;
9f616d61 235
236}
237
238//____________________________________________________________________________
7b7c1533 239void AliPHOSGeometry::EmcXtalCoverage(Double_t & theta, Double_t & phi, Option_t * opt) const
9f616d61 240{
a4e98857 241 // calculates the angular coverage in theta and phi of a single crystal in a EMC(=PHOS) module
9f616d61 242
243 Double_t conv ;
cf0c2bc1 244 if ( opt == Radian() )
9f616d61 245 conv = 1. ;
cf0c2bc1 246 else if ( opt == Degre() )
9f616d61 247 conv = 180. / TMath::Pi() ;
248 else {
249 cout << "<I> AliPHOSGeometry::EmcXtalCoverage : " << opt << " unknown option; result in radian " << endl ;
250 conv = 1. ;
251 }
252
710f859a 253 Float_t y0 = GetIPtoCrystalSurface() ;
92862013 254 theta = 2 * TMath::ATan( GetCrystalSize(2) / (2 * y0) ) * conv ;
255 phi = 2 * TMath::ATan( GetCrystalSize(0) / (2 * y0) ) * conv ;
9f616d61 256}
257
258
259//____________________________________________________________________________
52a36ffd 260void AliPHOSGeometry::GetGlobal(const AliRecPoint* RecPoint, TVector3 & gpos, TMatrix & gmat) const
d15a28e7 261{
a4e98857 262 // Calculates the coordinates of a RecPoint and the error matrix in the ALICE global coordinate system
b2a60966 263
d15a28e7 264 AliPHOSRecPoint * tmpPHOS = (AliPHOSRecPoint *) RecPoint ;
92862013 265 TVector3 localposition ;
d15a28e7 266
267 tmpPHOS->GetLocalPosition(gpos) ;
268
269
270 if ( tmpPHOS->IsEmc() ) // it is a EMC crystal
710f859a 271 { gpos.SetY( - GetIPtoCrystalSurface()) ;
d15a28e7 272
273 }
274 else
710f859a 275 { // it is a CPV
276 gpos.SetY(- GetIPtoUpperCPVsurface() ) ;
d15a28e7 277 }
278
92862013 279 Float_t phi = GetPHOSAngle( tmpPHOS->GetPHOSMod()) ;
280 Double_t const kRADDEG = 180.0 / kPI ;
281 Float_t rphi = phi / kRADDEG ;
d15a28e7 282
92862013 283 TRotation rot ;
284 rot.RotateZ(-rphi) ; // a rotation around Z by angle
d15a28e7 285
92862013 286 TRotation dummy = rot.Invert() ; // to transform from original frame to rotate frame
287 gpos.Transform(rot) ; // rotate the baby
6ad0bfa0 288
d15a28e7 289}
290
291//____________________________________________________________________________
5cda30f6 292void AliPHOSGeometry::GetGlobal(const AliRecPoint* RecPoint, TVector3 & gpos) const
d15a28e7 293{
a4e98857 294 // Calculates the coordinates of a RecPoint in the ALICE global coordinate system
b2a60966 295
d15a28e7 296 AliPHOSRecPoint * tmpPHOS = (AliPHOSRecPoint *) RecPoint ;
92862013 297 TVector3 localposition ;
d15a28e7 298 tmpPHOS->GetLocalPosition(gpos) ;
299
300
301 if ( tmpPHOS->IsEmc() ) // it is a EMC crystal
710f859a 302 { gpos.SetY( - GetIPtoCrystalSurface() ) ;
d15a28e7 303 }
304 else
710f859a 305 { // it is a CPV
306 gpos.SetY(- GetIPtoUpperCPVsurface() ) ;
d15a28e7 307 }
308
92862013 309 Float_t phi = GetPHOSAngle( tmpPHOS->GetPHOSMod()) ;
310 Double_t const kRADDEG = 180.0 / kPI ;
311 Float_t rphi = phi / kRADDEG ;
d15a28e7 312
92862013 313 TRotation rot ;
314 rot.RotateZ(-rphi) ; // a rotation around Z by angle
d15a28e7 315
92862013 316 TRotation dummy = rot.Invert() ; // to transform from original frame to rotate frame
317 gpos.Transform(rot) ; // rotate the baby
d15a28e7 318}
319
320//____________________________________________________________________________
7b7c1533 321void AliPHOSGeometry::ImpactOnEmc(const Double_t theta, const Double_t phi, Int_t & ModuleNumber, Double_t & z, Double_t & x) const
d15a28e7 322{
a4e98857 323 // calculates the impact coordinates on PHOS of a neutral particle
324 // emitted in the direction theta and phi in the ALICE global coordinate system
d15a28e7 325
52a36ffd 326 // searches for the PHOS EMC module
327 ModuleNumber = 0 ;
328 Double_t tm, tM, pm, pM ;
329 Int_t index = 1 ;
330 while ( ModuleNumber == 0 && index <= GetNModules() ) {
331 EmcModuleCoverage(index, tm, tM, pm, pM) ;
332 if ( (theta >= tm && theta <= tM) && (phi >= pm && phi <= pM ) )
333 ModuleNumber = index ;
334 index++ ;
d15a28e7 335 }
52a36ffd 336 if ( ModuleNumber != 0 ) {
337 Float_t phi0 = GetPHOSAngle(ModuleNumber) * (TMath::Pi() / 180.) + 1.5 * TMath::Pi() ;
710f859a 338 Float_t y0 = GetIPtoCrystalSurface() ;
52a36ffd 339 Double_t angle = phi - phi0;
340 x = y0 * TMath::Tan(angle) ;
341 angle = theta - TMath::Pi() / 2 ;
342 z = y0 * TMath::Tan(angle) ;
d15a28e7 343 }
d15a28e7 344}
345
1c9d8212 346Bool_t AliPHOSGeometry::Impact(const TParticle * particle) const
347{
348 Bool_t In=kFALSE;
349 Int_t ModuleNumber=0;
350 Double_t z,x;
351 ImpactOnEmc(particle->Theta(),particle->Phi(),ModuleNumber,z,x);
352 if(ModuleNumber) In=kTRUE;
353 else In=kFALSE;
354 return In;
355}
356
d15a28e7 357//____________________________________________________________________________
7b7c1533 358Bool_t AliPHOSGeometry::RelToAbsNumbering(const Int_t * relid, Int_t & AbsId) const
d15a28e7 359{
b2a60966 360 // Converts the relative numbering into the absolute numbering
ed4205d8 361 // EMCA crystals:
362 // AbsId = from 1 to fNModules * fNPhi * fNZ
ed4205d8 363 // CPV pad:
364 // AbsId = from N(total PHOS crystals) + 1
365 // to NCPVModules * fNumberOfCPVPadsPhi * fNumberOfCPVPadsZ
d15a28e7 366
367 Bool_t rv = kTRUE ;
710f859a 368
369 if ( relid[1] == 0 ) { // it is a Phos crystal
52a36ffd 370 AbsId =
710f859a 371 ( relid[0] - 1 ) * GetNPhi() * GetNZ() // the offset of PHOS modules
372 + ( relid[2] - 1 ) * GetNZ() // the offset along phi
373 + relid[3] ; // the offset along z
d15a28e7 374 }
710f859a 375 else { // it is a CPV pad
376 AbsId = GetNPhi() * GetNZ() * GetNModules() // the offset to separate EMCA crystals from CPV pads
377 + ( relid[0] - 1 ) * GetNumberOfCPVPadsPhi() * GetNumberOfCPVPadsZ() // the pads offset of PHOS modules
378 + ( relid[2] - 1 ) * GetNumberOfCPVPadsZ() // the pads offset of a CPV row
52a36ffd 379 + relid[3] ; // the column number
380 }
381
d15a28e7 382 return rv ;
383}
384
385//____________________________________________________________________________
386
7b7c1533 387void AliPHOSGeometry::RelPosInAlice(const Int_t id, TVector3 & pos ) const
d15a28e7 388{
a4e98857 389 // Converts the absolute numbering into the global ALICE coordinate system
b2a60966 390
ed4205d8 391
392 Int_t relid[4] ;
393
394 AbsToRelNumbering(id , relid) ;
395
396 Int_t phosmodule = relid[0] ;
397
398 Float_t y0 = 0 ;
399
710f859a 400 if ( relid[1] == 0 ) // it is a PbW04 crystal
401 y0 = - GetIPtoCrystalSurface() ;
402 else
403 y0 = - GetIPtoUpperCPVsurface() ;
404
ed4205d8 405 Float_t x, z ;
406 RelPosInModule(relid, x, z) ;
407
408 pos.SetX(x) ;
409 pos.SetZ(z) ;
710f859a 410 pos.SetY(y0) ;
ed4205d8 411
412 Float_t phi = GetPHOSAngle( phosmodule) ;
413 Double_t const kRADDEG = 180.0 / kPI ;
414 Float_t rphi = phi / kRADDEG ;
415
416 TRotation rot ;
417 rot.RotateZ(-rphi) ; // a rotation around Z by angle
418
419 TRotation dummy = rot.Invert() ; // to transform from original frame to rotate frame
420
421 pos.Transform(rot) ; // rotate the baby
d15a28e7 422}
423
424//____________________________________________________________________________
7b7c1533 425void AliPHOSGeometry::RelPosInModule(const Int_t * relid, Float_t & x, Float_t & z) const
d15a28e7 426{
b2a60966 427 // Converts the relative numbering into the local PHOS-module (x, z) coordinates
52a36ffd 428 // Note: sign of z differs from that in the previous version (Yu.Kharlov, 12 Oct 2000)
b2a60966 429
786222b3 430 Int_t row = relid[2] ; //offset along x axis
431 Int_t column = relid[3] ; //offset along z axis
d15a28e7 432
ed4205d8 433
66c3e8ff 434 if ( relid[1] == 0 ) { // its a PbW04 crystal
435 x = - ( GetNPhi()/2. - row + 0.5 ) * GetCellStep() ; // position of Xtal with respect
436 z = ( GetNZ() /2. - column + 0.5 ) * GetCellStep() ; // of center of PHOS module
52a36ffd 437 }
438 else {
710f859a 439 x = - ( GetNumberOfCPVPadsPhi()/2. - row - 0.5 ) * GetPadSizePhi() ; // position of pad with respect
440 z = ( GetNumberOfCPVPadsZ() /2. - column - 0.5 ) * GetPadSizeZ() ; // of center of PHOS module
52a36ffd 441 }
2f3366b6 442}