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 *
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 **************************************************************************/
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 this->SetPHOSAngles() ;
112 fRotMatrixArray = new TObjArray(fNModules) ;
116 //____________________________________________________________________________
117 AliPHOSGeometry * AliPHOSGeometry::GetInstance()
119 // Returns the pointer of the unique instance; singleton specific
121 return static_cast<AliPHOSGeometry *>( fgGeom ) ;
124 //____________________________________________________________________________
125 AliPHOSGeometry * AliPHOSGeometry::GetInstance(const Text_t* name, const Text_t* title)
127 // Returns the pointer of the unique instance
128 // Creates it with the specified options (name, title) if it does not exist yet
130 AliPHOSGeometry * rv = 0 ;
132 if ( strcmp(name,"") == 0 )
135 fgGeom = new AliPHOSGeometry(name, title) ;
137 rv = (AliPHOSGeometry * ) fgGeom ;
146 if ( strcmp(fgGeom->GetName(), name) != 0 )
147 ::Error("GetInstance", "Current geometry is %s. You cannot call %s",
148 fgGeom->GetName(), name) ;
150 rv = (AliPHOSGeometry *) fgGeom ;
155 //____________________________________________________________________________
156 void AliPHOSGeometry::SetPHOSAngles()
158 // Calculates the position of the PHOS modules in ALICE global coordinate system
160 Double_t const kRADDEG = 180.0 / TMath::Pi() ;
161 Float_t pphi = 2 * TMath::ATan( GetOuterBoxSize(0) / ( 2.0 * GetIPtoUpperCPVsurface() ) ) ;
164 AliError(Form("PHOS modules overlap!\n pphi = %f fAngle = %f",
170 for( Int_t i = 1; i <= fNModules ; i++ ) {
171 Float_t angle = pphi * ( i - fNModules / 2.0 - 0.5 ) ;
172 fPHOSAngle[i-1] = - angle ;
176 //____________________________________________________________________________
177 Bool_t AliPHOSGeometry::AbsToRelNumbering(Int_t AbsId, Int_t * relid) const
179 // Converts the absolute numbering into the following array/
180 // relid[0] = PHOS Module number 1:fNModules
181 // relid[1] = 0 if PbW04
183 // relid[2] = Row number inside a PHOS module
184 // relid[3] = Column number inside a PHOS module
189 Int_t phosmodulenumber = (Int_t)TMath:: Ceil( id / GetNCristalsInModule() ) ;
191 if ( phosmodulenumber > GetNModules() ) { // it is a CPV pad
193 id -= GetNPhi() * GetNZ() * GetNModules() ;
194 Float_t nCPV = GetNumberOfCPVPadsPhi() * GetNumberOfCPVPadsZ() ;
195 relid[0] = (Int_t) TMath::Ceil( id / nCPV ) ;
197 id -= ( relid[0] - 1 ) * nCPV ;
198 relid[2] = (Int_t) TMath::Ceil( id / GetNumberOfCPVPadsZ() ) ;
199 relid[3] = (Int_t) ( id - ( relid[2] - 1 ) * GetNumberOfCPVPadsZ() ) ;
201 else { // it is a PW04 crystal
203 relid[0] = phosmodulenumber ;
205 id -= ( phosmodulenumber - 1 ) * GetNPhi() * GetNZ() ;
206 relid[2] = (Int_t)TMath::Ceil( id / GetNZ() ) ;
207 relid[3] = (Int_t)( id - ( relid[2] - 1 ) * GetNZ() ) ;
212 //____________________________________________________________________________
213 void AliPHOSGeometry::EmcModuleCoverage(Int_t mod, Double_t & tm, Double_t & tM, Double_t & pm, Double_t & pM, Option_t * opt) const
215 // calculates the angular coverage in theta and phi of one EMC (=PHOS) module
218 if ( opt == Radian() )
220 else if ( opt == Degre() )
221 conv = 180. / TMath::Pi() ;
223 AliWarning(Form("%s unknown option; result in radian", opt)) ;
227 Float_t phi = GetPHOSAngle(mod) * (TMath::Pi() / 180.) ;
228 Float_t y0 = GetIPtoCrystalSurface() ;
229 Float_t * strip = fGeometryEMCA->GetStripHalfSize() ;
230 Float_t x0 = fGeometryEMCA->GetNStripX()*strip[0] ;
231 Float_t z0 = fGeometryEMCA->GetNStripZ()*strip[2] ;
232 Double_t angle = TMath::ATan( x0 / y0 ) ;
233 phi = phi + 1.5 * TMath::Pi() ; // to follow the convention of the particle generator(PHOS is between 220 and 320 deg.)
234 Double_t max = phi - angle ;
235 Double_t min = phi + angle ;
236 pM = TMath::Max(max, min) * conv ;
237 pm = TMath::Min(max, min) * conv ;
239 angle = TMath::ATan( z0 / y0 ) ;
240 max = TMath::Pi() / 2. + angle ; // to follow the convention of the particle generator(PHOS is at 90 deg.)
241 min = TMath::Pi() / 2. - angle ;
242 tM = TMath::Max(max, min) * conv ;
243 tm = TMath::Min(max, min) * conv ;
247 //____________________________________________________________________________
248 void AliPHOSGeometry::EmcXtalCoverage(Double_t & theta, Double_t & phi, Option_t * opt) const
250 // calculates the angular coverage in theta and phi of a single crystal in a EMC(=PHOS) module
253 if ( opt == Radian() )
255 else if ( opt == Degre() )
256 conv = 180. / TMath::Pi() ;
258 AliWarning(Form("%s unknown option; result in radian", opt)) ;
262 Float_t y0 = GetIPtoCrystalSurface() ;
263 theta = 2 * TMath::ATan( GetCrystalSize(2) / (2 * y0) ) * conv ;
264 phi = 2 * TMath::ATan( GetCrystalSize(0) / (2 * y0) ) * conv ;
268 //____________________________________________________________________________
269 void AliPHOSGeometry::GetGlobal(const AliRecPoint* RecPoint, TVector3 & gpos, TMatrixF & /*gmat*/) const
271 // Calculates the coordinates of a RecPoint and the error matrix in the ALICE global coordinate system
273 AliPHOSRecPoint * tmpPHOS = (AliPHOSRecPoint *) RecPoint ;
274 TVector3 localposition ;
276 tmpPHOS->GetLocalPosition(gpos) ;
279 if ( tmpPHOS->IsEmc() ) // it is a EMC crystal
280 { gpos.SetY( - GetIPtoCrystalSurface()) ;
285 gpos.SetY(- GetIPtoUpperCPVsurface() ) ;
288 Float_t phi = GetPHOSAngle( tmpPHOS->GetPHOSMod()) ;
289 Double_t const kRADDEG = 180.0 / TMath::Pi() ;
290 Float_t rphi = phi / kRADDEG ;
293 rot.RotateZ(-rphi) ; // a rotation around Z by angle
295 TRotation dummy = rot.Invert() ; // to transform from original frame to rotate frame
296 gpos.Transform(rot) ; // rotate the baby
300 //____________________________________________________________________________
301 void AliPHOSGeometry::GetGlobal(const AliRecPoint* RecPoint, TVector3 & gpos) const
303 // Calculates the coordinates of a RecPoint in the ALICE global coordinate system
305 AliPHOSRecPoint * tmpPHOS = (AliPHOSRecPoint *) RecPoint ;
306 TVector3 localposition ;
307 tmpPHOS->GetLocalPosition(gpos) ;
310 if ( tmpPHOS->IsEmc() ) // it is a EMC crystal
311 { gpos.SetY( - GetIPtoCrystalSurface() ) ;
315 gpos.SetY(- GetIPtoUpperCPVsurface() ) ;
318 Float_t phi = GetPHOSAngle( tmpPHOS->GetPHOSMod()) ;
319 Double_t const kRADDEG = 180.0 / TMath::Pi() ;
320 Float_t rphi = phi / kRADDEG ;
323 rot.RotateZ(-rphi) ; // a rotation around Z by angle
325 TRotation dummy = rot.Invert() ; // to transform from original frame to rotate frame
326 gpos.Transform(rot) ; // rotate the baby
329 //____________________________________________________________________________
330 void AliPHOSGeometry::ImpactOnEmc(Double_t theta, Double_t phi, Int_t & moduleNumber, Double_t & z, Double_t & x) const
332 // calculates the impact coordinates on PHOS of a neutral particle
333 // emitted in the direction theta and phi in the ALICE global coordinate system
335 // searches for the PHOS EMC module
338 Double_t tm, tM, pm, pM ;
340 while ( moduleNumber == 0 && index <= GetNModules() ) {
341 EmcModuleCoverage(index, tm, tM, pm, pM) ;
342 if ( (theta >= tm && theta <= tM) && (phi >= pm && phi <= pM ) )
343 moduleNumber = index ;
346 if ( moduleNumber != 0 ) {
347 Float_t phi0 = GetPHOSAngle(moduleNumber) * (TMath::Pi() / 180.) + 1.5 * TMath::Pi() ;
348 Float_t y0 = GetIPtoCrystalSurface() ;
349 Double_t angle = phi - phi0;
350 x = y0 * TMath::Tan(angle) ;
351 angle = theta - TMath::Pi() / 2 ;
352 z = y0 * TMath::Tan(angle) ;
356 //____________________________________________________________________________
357 void AliPHOSGeometry::ImpactOnEmc(const TVector3& vec, Int_t & moduleNumber, Double_t & z, Double_t & x) const
359 // calculates the impact coordinates on PHOS of a neutral particle
360 // emitted in the direction theta and phi in the ALICE global coordinate system
361 // searches for the PHOS EMC module
363 Double_t theta = vec.Theta() ;
364 Double_t phi = vec.Phi() ;
366 ImpactOnEmc(theta, phi, moduleNumber, z, x) ;
369 //____________________________________________________________________________
370 void AliPHOSGeometry::ImpactOnEmc(const TParticle& p, Int_t & moduleNumber, Double_t & z, Double_t & x) const
372 // calculates the impact coordinates on PHOS of a neutral particle
373 // emitted in the direction theta and phi in the ALICE global coordinate system
375 // searches for the PHOS EMC module
376 Double_t theta = p.Theta() ;
377 Double_t phi = p.Phi() ;
379 ImpactOnEmc(theta, phi, moduleNumber, z, x) ;
382 //____________________________________________________________________________
383 Bool_t AliPHOSGeometry::Impact(const TParticle * particle) const
385 // Tells if a particle enters PHOS
387 Int_t moduleNumber=0;
389 ImpactOnEmc(particle->Theta(),particle->Phi(),moduleNumber,z,x);
397 //____________________________________________________________________________
398 Bool_t AliPHOSGeometry::RelToAbsNumbering(const Int_t * relid, Int_t & AbsId) const
400 // Converts the relative numbering into the absolute numbering
402 // AbsId = from 1 to fNModules * fNPhi * fNZ
404 // AbsId = from N(total PHOS crystals) + 1
405 // to NCPVModules * fNumberOfCPVPadsPhi * fNumberOfCPVPadsZ
409 if ( relid[1] == 0 ) { // it is a Phos crystal
411 ( relid[0] - 1 ) * GetNPhi() * GetNZ() // the offset of PHOS modules
412 + ( relid[2] - 1 ) * GetNZ() // the offset along phi
413 + relid[3] ; // the offset along z
415 else { // it is a CPV pad
416 AbsId = GetNPhi() * GetNZ() * GetNModules() // the offset to separate EMCA crystals from CPV pads
417 + ( relid[0] - 1 ) * GetNumberOfCPVPadsPhi() * GetNumberOfCPVPadsZ() // the pads offset of PHOS modules
418 + ( relid[2] - 1 ) * GetNumberOfCPVPadsZ() // the pads offset of a CPV row
419 + relid[3] ; // the column number
425 //____________________________________________________________________________
427 void AliPHOSGeometry::RelPosInAlice(Int_t id, TVector3 & pos ) const
429 // Converts the absolute numbering into the global ALICE coordinate system
434 AbsToRelNumbering(id , relid) ;
436 Int_t phosmodule = relid[0] ;
440 if ( relid[1] == 0 ) // it is a PbW04 crystal
441 y0 = - GetIPtoCrystalSurface() ;
443 y0 = - GetIPtoUpperCPVsurface() ;
446 RelPosInModule(relid, x, z) ;
452 Float_t phi = GetPHOSAngle( phosmodule) ;
453 Double_t const kRADDEG = 180.0 / TMath::Pi() ;
454 Float_t rphi = phi / kRADDEG ;
457 rot.RotateZ(-rphi) ; // a rotation around Z by angle
459 TRotation dummy = rot.Invert() ; // to transform from original frame to rotate frame
461 pos.Transform(rot) ; // rotate the baby
464 //____________________________________________________________________________
465 void AliPHOSGeometry::RelPosToAbsId(Int_t module, Double_t x, Double_t z, Int_t & AbsId) const
467 // converts local PHOS-module (x, z) coordinates to absId
471 relid[2] = static_cast<Int_t>(TMath::Ceil( x/ GetCellStep() + GetNPhi() / 2.) );
472 relid[3] = static_cast<Int_t>(TMath::Ceil(-z/ GetCellStep() + GetNZ() / 2.) ) ;
474 RelToAbsNumbering(relid,AbsId) ;
477 //____________________________________________________________________________
478 void AliPHOSGeometry::RelPosInModule(const Int_t * relid, Float_t & x, Float_t & z) const
480 // Converts the relative numbering into the local PHOS-module (x, z) coordinates
481 // Note: sign of z differs from that in the previous version (Yu.Kharlov, 12 Oct 2000)
483 Int_t row = relid[2] ; //offset along x axis
484 Int_t column = relid[3] ; //offset along z axis
487 if ( relid[1] == 0 ) { // its a PbW04 crystal
488 x = - ( GetNPhi()/2. - row + 0.5 ) * GetCellStep() ; // position of Xtal with respect
489 z = - ( GetNZ() /2. - column + 0.5 ) * GetCellStep() ; // of center of PHOS module
492 x = - ( GetNumberOfCPVPadsPhi()/2. - row - 0.5 ) * GetPadSizePhi() ; // position of pad with respect
493 z = - ( GetNumberOfCPVPadsZ() /2. - column - 0.5 ) * GetPadSizeZ() ; // of center of PHOS module
497 //____________________________________________________________________________
499 void AliPHOSGeometry::GetModuleCenter(TVector3& center,
503 // Returns a position of the center of the CPV or EMC module
505 if (strcmp(det,"CPV") == 0) rDet = GetIPtoCPVDistance ();
506 else if (strcmp(det,"EMC") == 0) rDet = GetIPtoCrystalSurface();
508 AliFatal(Form("Wrong detector name %s",det));
510 Float_t angle = GetPHOSAngle(module); // (40,20,0,-20,-40) degrees
511 angle *= TMath::Pi()/180;
512 angle += 3*TMath::Pi()/2.;
513 center.SetXYZ(rDet*TMath::Cos(angle), rDet*TMath::Sin(angle), 0.);
516 //____________________________________________________________________________
518 void AliPHOSGeometry::Global2Local(TVector3& localPosition,
519 const TVector3& globalPosition,
522 // Transforms a global position of the rec.point to the local coordinate system
523 Float_t angle = GetPHOSAngle(module); // (40,20,0,-20,-40) degrees
524 angle *= TMath::Pi()/180;
525 angle += 3*TMath::Pi()/2.;
526 localPosition = globalPosition;
527 localPosition.RotateZ(-angle);