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 *
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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 PHOS : singleton
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.
27 // -- Author: Yves Schutz (SUBATECH) & Dmitri Peressounko (RRC "KI" & SUBATECH)
29 // --- ROOT system ---
32 #include "TRotation.h"
33 #include "TParticle.h"
35 // --- Standard library ---
37 // --- AliRoot header files ---
39 #include "AliPHOSGeometry.h"
40 #include "AliPHOSEMCAGeometry.h"
41 #include "AliPHOSRecPoint.h"
43 ClassImp(AliPHOSGeometry)
45 // these initialisations are needed for a singleton
46 AliPHOSGeometry * AliPHOSGeometry::fgGeom = 0 ;
47 Bool_t AliPHOSGeometry::fgInit = kFALSE ;
49 //____________________________________________________________________________
50 AliPHOSGeometry::AliPHOSGeometry() {
52 // must be kept public for root persistency purposes, but should never be called by the outside world
61 //____________________________________________________________________________
62 AliPHOSGeometry::~AliPHOSGeometry(void)
66 if (fRotMatrixArray) fRotMatrixArray->Delete() ;
67 if (fRotMatrixArray) delete fRotMatrixArray ;
68 if (fPHOSAngle ) delete[] fPHOSAngle ;
70 //____________________________________________________________________________
72 void AliPHOSGeometry::Init(void)
74 // Initializes the PHOS parameters :
75 // IHEP is the Protvino CPV (cathode pad chambers)
77 TString test(GetName()) ;
78 if (test != "IHEP" ) {
79 AliFatal(Form("%s is not a known geometry (choose among IHEP)",
88 fGeometryEMCA = new AliPHOSEMCAGeometry();
90 fGeometryCPV = new AliPHOSCPVGeometry ();
92 fGeometrySUPP = new AliPHOSSupportGeometry();
94 fPHOSAngle = new Float_t[fNModules] ;
96 Float_t * emcParams = fGeometryEMCA->GetEMCParams() ;
98 fPHOSParams[0] = TMath::Max((Double_t)fGeometryCPV->GetCPVBoxSize(0)/2.,
99 (Double_t)(emcParams[0] - (emcParams[1]-emcParams[0])*
100 fGeometryCPV->GetCPVBoxSize(1)/2/emcParams[3]));
101 fPHOSParams[1] = emcParams[1] ;
102 fPHOSParams[2] = TMath::Max((Double_t)emcParams[2], (Double_t)fGeometryCPV->GetCPVBoxSize(2)/2.);
103 fPHOSParams[3] = emcParams[3] + fGeometryCPV->GetCPVBoxSize(1)/2. ;
105 fIPtoUpperCPVsurface = fGeometryEMCA->GetIPtoOuterCoverDistance() - fGeometryCPV->GetCPVBoxSize(1) ;
108 for ( index = 0; index < fNModules; index++ )
109 fPHOSAngle[index] = 0.0 ; // Module position angles are set in CreateGeometry()
111 fRotMatrixArray = new TObjArray(fNModules) ;
113 // Geometry parameters are calculated
116 Double_t const kRADDEG = 180.0 / TMath::Pi() ;
117 Float_t r = GetIPtoOuterCoverDistance() + fPHOSParams[3] - GetCPVBoxSize(1) ;
118 for (Int_t iModule=0; iModule<fNModules; iModule++) {
119 fModuleCenter[iModule][0] = r * TMath::Sin(fPHOSAngle[iModule] / kRADDEG );
120 fModuleCenter[iModule][1] =-r * TMath::Cos(fPHOSAngle[iModule] / kRADDEG );
121 fModuleCenter[iModule][2] = 0.;
123 fModuleAngle[iModule][0][0] = 90;
124 fModuleAngle[iModule][0][1] = fPHOSAngle[iModule];
125 fModuleAngle[iModule][1][0] = 0;
126 fModuleAngle[iModule][1][1] = 0;
127 fModuleAngle[iModule][2][0] = 90;
128 fModuleAngle[iModule][2][1] = 270 + fPHOSAngle[iModule];
133 //____________________________________________________________________________
134 AliPHOSGeometry * AliPHOSGeometry::GetInstance()
136 // Returns the pointer of the unique instance; singleton specific
138 return static_cast<AliPHOSGeometry *>( fgGeom ) ;
141 //____________________________________________________________________________
142 AliPHOSGeometry * AliPHOSGeometry::GetInstance(const Text_t* name, const Text_t* title)
144 // Returns the pointer of the unique instance
145 // Creates it with the specified options (name, title) if it does not exist yet
147 AliPHOSGeometry * rv = 0 ;
149 if ( strcmp(name,"") == 0 )
152 fgGeom = new AliPHOSGeometry(name, title) ;
154 rv = (AliPHOSGeometry * ) fgGeom ;
163 if ( strcmp(fgGeom->GetName(), name) != 0 )
164 ::Error("GetInstance", "Current geometry is %s. You cannot call %s",
165 fgGeom->GetName(), name) ;
167 rv = (AliPHOSGeometry *) fgGeom ;
172 //____________________________________________________________________________
173 void AliPHOSGeometry::SetPHOSAngles()
175 // Calculates the position of the PHOS modules in ALICE global coordinate system
177 Double_t const kRADDEG = 180.0 / TMath::Pi() ;
178 Float_t pphi = 2 * TMath::ATan( GetOuterBoxSize(0) / ( 2.0 * GetIPtoUpperCPVsurface() ) ) ;
181 AliError(Form("PHOS modules overlap!\n pphi = %f fAngle = %f",
187 for( Int_t i = 1; i <= fNModules ; i++ ) {
188 Float_t angle = pphi * ( i - fNModules / 2.0 - 0.5 ) ;
189 fPHOSAngle[i-1] = - angle ;
193 //____________________________________________________________________________
194 Bool_t AliPHOSGeometry::AbsToRelNumbering(Int_t AbsId, Int_t * relid) const
196 // Converts the absolute numbering into the following array/
197 // relid[0] = PHOS Module number 1:fNModules
198 // relid[1] = 0 if PbW04
200 // relid[2] = Row number inside a PHOS module
201 // relid[3] = Column number inside a PHOS module
206 Int_t phosmodulenumber = (Int_t)TMath:: Ceil( id / GetNCristalsInModule() ) ;
208 if ( phosmodulenumber > GetNModules() ) { // it is a CPV pad
210 id -= GetNPhi() * GetNZ() * GetNModules() ;
211 Float_t nCPV = GetNumberOfCPVPadsPhi() * GetNumberOfCPVPadsZ() ;
212 relid[0] = (Int_t) TMath::Ceil( id / nCPV ) ;
214 id -= ( relid[0] - 1 ) * nCPV ;
215 relid[2] = (Int_t) TMath::Ceil( id / GetNumberOfCPVPadsZ() ) ;
216 relid[3] = (Int_t) ( id - ( relid[2] - 1 ) * GetNumberOfCPVPadsZ() ) ;
218 else { // it is a PW04 crystal
220 relid[0] = phosmodulenumber ;
222 id -= ( phosmodulenumber - 1 ) * GetNPhi() * GetNZ() ;
223 relid[2] = (Int_t)TMath::Ceil( id / GetNZ() ) ;
224 relid[3] = (Int_t)( id - ( relid[2] - 1 ) * GetNZ() ) ;
229 //____________________________________________________________________________
230 void AliPHOSGeometry::EmcModuleCoverage(Int_t mod, Double_t & tm, Double_t & tM, Double_t & pm, Double_t & pM, Option_t * opt) const
232 // calculates the angular coverage in theta and phi of one EMC (=PHOS) module
235 if ( opt == Radian() )
237 else if ( opt == Degre() )
238 conv = 180. / TMath::Pi() ;
240 AliWarning(Form("%s unknown option; result in radian", opt)) ;
244 Float_t phi = GetPHOSAngle(mod) * (TMath::Pi() / 180.) ;
245 Float_t y0 = GetIPtoCrystalSurface() ;
246 Float_t * strip = fGeometryEMCA->GetStripHalfSize() ;
247 Float_t x0 = fGeometryEMCA->GetNStripX()*strip[0] ;
248 Float_t z0 = fGeometryEMCA->GetNStripZ()*strip[2] ;
249 Double_t angle = TMath::ATan( x0 / y0 ) ;
250 phi = phi + 1.5 * TMath::Pi() ; // to follow the convention of the particle generator(PHOS is between 220 and 320 deg.)
251 Double_t max = phi - angle ;
252 Double_t min = phi + angle ;
253 pM = TMath::Max(max, min) * conv ;
254 pm = TMath::Min(max, min) * conv ;
256 angle = TMath::ATan( z0 / y0 ) ;
257 max = TMath::Pi() / 2. + angle ; // to follow the convention of the particle generator(PHOS is at 90 deg.)
258 min = TMath::Pi() / 2. - angle ;
259 tM = TMath::Max(max, min) * conv ;
260 tm = TMath::Min(max, min) * conv ;
264 //____________________________________________________________________________
265 void AliPHOSGeometry::EmcXtalCoverage(Double_t & theta, Double_t & phi, Option_t * opt) const
267 // calculates the angular coverage in theta and phi of a single crystal in a EMC(=PHOS) module
270 if ( opt == Radian() )
272 else if ( opt == Degre() )
273 conv = 180. / TMath::Pi() ;
275 AliWarning(Form("%s unknown option; result in radian", opt)) ;
279 Float_t y0 = GetIPtoCrystalSurface() ;
280 theta = 2 * TMath::ATan( GetCrystalSize(2) / (2 * y0) ) * conv ;
281 phi = 2 * TMath::ATan( GetCrystalSize(0) / (2 * y0) ) * conv ;
285 //____________________________________________________________________________
286 void AliPHOSGeometry::GetGlobal(const AliRecPoint* RecPoint, TVector3 & gpos, TMatrixF & /*gmat*/) const
288 // Calculates the coordinates of a RecPoint and the error matrix in the ALICE global coordinate system
290 AliPHOSRecPoint * tmpPHOS = (AliPHOSRecPoint *) RecPoint ;
291 TVector3 localposition ;
293 tmpPHOS->GetLocalPosition(gpos) ;
296 if ( tmpPHOS->IsEmc() ) // it is a EMC crystal
297 { gpos.SetY( - GetIPtoCrystalSurface()) ;
302 gpos.SetY(- GetIPtoUpperCPVsurface() ) ;
305 Float_t phi = GetPHOSAngle( tmpPHOS->GetPHOSMod()) ;
306 Double_t const kRADDEG = 180.0 / TMath::Pi() ;
307 Float_t rphi = phi / kRADDEG ;
310 rot.RotateZ(-rphi) ; // a rotation around Z by angle
312 TRotation dummy = rot.Invert() ; // to transform from original frame to rotate frame
313 gpos.Transform(rot) ; // rotate the baby
317 //____________________________________________________________________________
318 void AliPHOSGeometry::GetGlobal(const AliRecPoint* RecPoint, TVector3 & gpos) const
320 // Calculates the coordinates of a RecPoint in the ALICE global coordinate system
322 AliPHOSRecPoint * tmpPHOS = (AliPHOSRecPoint *) RecPoint ;
323 TVector3 localposition ;
324 tmpPHOS->GetLocalPosition(gpos) ;
327 if ( tmpPHOS->IsEmc() ) // it is a EMC crystal
328 { gpos.SetY( - GetIPtoCrystalSurface() ) ;
332 gpos.SetY(- GetIPtoUpperCPVsurface() ) ;
335 Float_t phi = GetPHOSAngle( tmpPHOS->GetPHOSMod()) ;
336 Double_t const kRADDEG = 180.0 / TMath::Pi() ;
337 Float_t rphi = phi / kRADDEG ;
340 rot.RotateZ(-rphi) ; // a rotation around Z by angle
342 TRotation dummy = rot.Invert() ; // to transform from original frame to rotate frame
343 gpos.Transform(rot) ; // rotate the baby
346 //____________________________________________________________________________
347 void AliPHOSGeometry::ImpactOnEmc(Double_t theta, Double_t phi, Int_t & moduleNumber, Double_t & z, Double_t & x) const
349 // calculates the impact coordinates on PHOS of a neutral particle
350 // emitted in the direction theta and phi in the ALICE global coordinate system
352 // searches for the PHOS EMC module
355 Double_t tm, tM, pm, pM ;
357 while ( moduleNumber == 0 && index <= GetNModules() ) {
358 EmcModuleCoverage(index, tm, tM, pm, pM) ;
359 if ( (theta >= tm && theta <= tM) && (phi >= pm && phi <= pM ) )
360 moduleNumber = index ;
363 if ( moduleNumber != 0 ) {
364 Float_t phi0 = GetPHOSAngle(moduleNumber) * (TMath::Pi() / 180.) + 1.5 * TMath::Pi() ;
365 Float_t y0 = GetIPtoCrystalSurface() ;
366 Double_t angle = phi - phi0;
367 x = y0 * TMath::Tan(angle) ;
368 angle = theta - TMath::Pi() / 2 ;
369 z = y0 * TMath::Tan(angle) ;
373 //____________________________________________________________________________
374 void AliPHOSGeometry::ImpactOnEmc(const TVector3& vec, Int_t & moduleNumber, Double_t & z, Double_t & x) const
376 // calculates the impact coordinates on PHOS of a neutral particle
377 // emitted in the direction theta and phi in the ALICE global coordinate system
378 // searches for the PHOS EMC module
380 Double_t theta = vec.Theta() ;
381 Double_t phi = vec.Phi() ;
383 ImpactOnEmc(theta, phi, moduleNumber, z, x) ;
386 //____________________________________________________________________________
387 void AliPHOSGeometry::ImpactOnEmc(const TParticle& p, Int_t & moduleNumber, Double_t & z, Double_t & x) const
389 // calculates the impact coordinates on PHOS of a neutral particle
390 // emitted in the direction theta and phi in the ALICE global coordinate system
392 // searches for the PHOS EMC module
393 Double_t theta = p.Theta() ;
394 Double_t phi = p.Phi() ;
396 ImpactOnEmc(theta, phi, moduleNumber, z, x) ;
399 //____________________________________________________________________________
400 Bool_t AliPHOSGeometry::Impact(const TParticle * particle) const
402 // Tells if a particle enters PHOS
404 Int_t moduleNumber=0;
406 ImpactOnEmc(particle->Theta(),particle->Phi(),moduleNumber,z,x);
414 //____________________________________________________________________________
415 Bool_t AliPHOSGeometry::RelToAbsNumbering(const Int_t * relid, Int_t & AbsId) const
417 // Converts the relative numbering into the absolute numbering
419 // AbsId = from 1 to fNModules * fNPhi * fNZ
421 // AbsId = from N(total PHOS crystals) + 1
422 // to NCPVModules * fNumberOfCPVPadsPhi * fNumberOfCPVPadsZ
426 if ( relid[1] == 0 ) { // it is a Phos crystal
428 ( relid[0] - 1 ) * GetNPhi() * GetNZ() // the offset of PHOS modules
429 + ( relid[2] - 1 ) * GetNZ() // the offset along phi
430 + relid[3] ; // the offset along z
432 else { // it is a CPV pad
433 AbsId = GetNPhi() * GetNZ() * GetNModules() // the offset to separate EMCA crystals from CPV pads
434 + ( relid[0] - 1 ) * GetNumberOfCPVPadsPhi() * GetNumberOfCPVPadsZ() // the pads offset of PHOS modules
435 + ( relid[2] - 1 ) * GetNumberOfCPVPadsZ() // the pads offset of a CPV row
436 + relid[3] ; // the column number
442 //____________________________________________________________________________
444 void AliPHOSGeometry::RelPosInAlice(Int_t id, TVector3 & pos ) const
446 // Converts the absolute numbering into the global ALICE coordinate system
451 AbsToRelNumbering(id , relid) ;
453 Int_t phosmodule = relid[0] ;
457 if ( relid[1] == 0 ) // it is a PbW04 crystal
458 y0 = - GetIPtoCrystalSurface() ;
460 y0 = - GetIPtoUpperCPVsurface() ;
463 RelPosInModule(relid, x, z) ;
469 Float_t phi = GetPHOSAngle( phosmodule) ;
470 Double_t const kRADDEG = 180.0 / TMath::Pi() ;
471 Float_t rphi = phi / kRADDEG ;
474 rot.RotateZ(-rphi) ; // a rotation around Z by angle
476 TRotation dummy = rot.Invert() ; // to transform from original frame to rotate frame
478 pos.Transform(rot) ; // rotate the baby
481 //____________________________________________________________________________
482 void AliPHOSGeometry::RelPosToAbsId(Int_t module, Double_t x, Double_t z, Int_t & AbsId) const
484 // converts local PHOS-module (x, z) coordinates to absId
488 relid[2] = static_cast<Int_t>(TMath::Ceil( x/ GetCellStep() + GetNPhi() / 2.) );
489 relid[3] = static_cast<Int_t>(TMath::Ceil(-z/ GetCellStep() + GetNZ() / 2.) ) ;
491 RelToAbsNumbering(relid,AbsId) ;
494 //____________________________________________________________________________
495 void AliPHOSGeometry::RelPosInModule(const Int_t * relid, Float_t & x, Float_t & z) const
497 // Converts the relative numbering into the local PHOS-module (x, z) coordinates
498 // Note: sign of z differs from that in the previous version (Yu.Kharlov, 12 Oct 2000)
500 Int_t row = relid[2] ; //offset along x axis
501 Int_t column = relid[3] ; //offset along z axis
504 if ( relid[1] == 0 ) { // its a PbW04 crystal
505 x = - ( GetNPhi()/2. - row + 0.5 ) * GetCellStep() ; // position of Xtal with respect
506 z = - ( GetNZ() /2. - column + 0.5 ) * GetCellStep() ; // of center of PHOS module
509 x = - ( GetNumberOfCPVPadsPhi()/2. - row - 0.5 ) * GetPadSizePhi() ; // position of pad with respect
510 z = - ( GetNumberOfCPVPadsZ() /2. - column - 0.5 ) * GetPadSizeZ() ; // of center of PHOS module
514 //____________________________________________________________________________
516 void AliPHOSGeometry::GetModuleCenter(TVector3& center,
520 // Returns a position of the center of the CPV or EMC module
522 if (strcmp(det,"CPV") == 0) rDet = GetIPtoCPVDistance ();
523 else if (strcmp(det,"EMC") == 0) rDet = GetIPtoCrystalSurface();
525 AliFatal(Form("Wrong detector name %s",det));
527 Float_t angle = GetPHOSAngle(module); // (40,20,0,-20,-40) degrees
528 angle *= TMath::Pi()/180;
529 angle += 3*TMath::Pi()/2.;
530 center.SetXYZ(rDet*TMath::Cos(angle), rDet*TMath::Sin(angle), 0.);
533 //____________________________________________________________________________
535 void AliPHOSGeometry::Global2Local(TVector3& localPosition,
536 const TVector3& globalPosition,
539 // Transforms a global position of the rec.point to the local coordinate system
540 Float_t angle = GetPHOSAngle(module); // (40,20,0,-20,-40) degrees
541 angle *= TMath::Pi()/180;
542 angle += 3*TMath::Pi()/2.;
543 localPosition = globalPosition;
544 localPosition.RotateZ(-angle);