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"
36 // --- Standard library ---
41 // --- AliRoot header files ---
43 #include "AliPHOSGeometry.h"
44 #include "AliPHOSEMCAGeometry.h"
45 #include "AliPHOSRecPoint.h"
48 ClassImp(AliPHOSGeometry) ;
50 // these initialisations are needed for a singleton
51 AliPHOSGeometry * AliPHOSGeometry::fgGeom = 0 ;
52 Bool_t AliPHOSGeometry::fgInit = kFALSE ;
54 //____________________________________________________________________________
55 AliPHOSGeometry::~AliPHOSGeometry(void)
59 if (fRotMatrixArray) fRotMatrixArray->Delete() ;
60 if (fRotMatrixArray) delete fRotMatrixArray ;
61 if (fPHOSAngle ) delete[] fPHOSAngle ;
63 //____________________________________________________________________________
65 void AliPHOSGeometry::Init(void)
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
77 fGeometryEMCA = new AliPHOSEMCAGeometry();
79 fGeometryCPV = new AliPHOSCPVGeometry ();
81 fGeometrySUPP = new AliPHOSSupportGeometry();
83 fPHOSAngle = new Float_t[fNModules] ;
85 Float_t * emcParams = fGeometryEMCA->GetEMCParams() ;
87 fPHOSParams[0] = TMath::Max((Double_t)fGeometryCPV->GetCPVBoxSize(0)/2.,
88 (Double_t)(emcParams[0]*(fGeometryCPV->GetCPVBoxSize(1)+emcParams[3]) -
89 emcParams[1]* fGeometryCPV->GetCPVBoxSize(1))/emcParams[3] ) ;
90 fPHOSParams[1] = emcParams[1] ;
91 fPHOSParams[2] = TMath::Max((Double_t)emcParams[2], (Double_t)fGeometryCPV->GetCPVBoxSize(2)/2.);
92 fPHOSParams[3] = emcParams[3] + fGeometryCPV->GetCPVBoxSize(1)/2. ;
94 fIPtoUpperCPVsurface = fGeometryEMCA->GetIPtoOuterCoverDistance() - fGeometryCPV->GetCPVBoxSize(1) ;
97 for ( index = 0; index < fNModules; index++ )
98 fPHOSAngle[index] = 0.0 ; // Module position angles are set in CreateGeometry()
100 this->SetPHOSAngles() ;
101 fRotMatrixArray = new TObjArray(fNModules) ;
106 //____________________________________________________________________________
107 AliPHOSGeometry * AliPHOSGeometry::GetInstance()
109 // Returns the pointer of the unique instance; singleton specific
111 return (AliPHOSGeometry *) fgGeom ;
114 //____________________________________________________________________________
115 AliPHOSGeometry * AliPHOSGeometry::GetInstance(const Text_t* name, const Text_t* title)
117 // Returns the pointer of the unique instance
118 // Creates it with the specified options (name, title) if it does not exist yet
120 AliPHOSGeometry * rv = 0 ;
122 if ( strcmp(name,"") == 0 )
125 fgGeom = new AliPHOSGeometry(name, title) ;
127 rv = (AliPHOSGeometry * ) fgGeom ;
136 if ( strcmp(fgGeom->GetName(), name) != 0 ) {
137 cout << "AliPHOSGeometry <E> : current geometry is " << fgGeom->GetName() << endl
138 << " you cannot call " << name << endl ;
141 rv = (AliPHOSGeometry *) fgGeom ;
146 //____________________________________________________________________________
147 void AliPHOSGeometry::SetPHOSAngles()
149 // Calculates the position of the PHOS modules in ALICE global coordinate system
151 Double_t const kRADDEG = 180.0 / kPI ;
152 Float_t pphi = 2 * TMath::ATan( GetOuterBoxSize(0) / ( 2.0 * GetIPtoUpperCPVsurface() ) ) ;
155 cout << "AliPHOSGeometry: PHOS modules overlap!\n";
156 cout << "pphi = " << pphi << " fAngle " << fAngle << endl ;
161 for( Int_t i = 1; i <= fNModules ; i++ ) {
162 Float_t angle = pphi * ( i - fNModules / 2.0 - 0.5 ) ;
163 fPHOSAngle[i-1] = - angle ;
167 //____________________________________________________________________________
168 Bool_t AliPHOSGeometry::AbsToRelNumbering(const Int_t AbsId, Int_t * relid) const
170 // Converts the absolute numbering into the following array/
171 // relid[0] = PHOS Module number 1:fNModules
172 // relid[1] = 0 if PbW04
174 // relid[2] = Row number inside a PHOS module
175 // relid[3] = Column number inside a PHOS module
180 Int_t phosmodulenumber = (Int_t)TMath:: Ceil( id / GetNCristalsInModule() ) ;
182 if ( phosmodulenumber > GetNModules() ) { // it is a CPV pad
184 id -= GetNPhi() * GetNZ() * GetNModules() ;
185 Float_t nCPV = GetNumberOfCPVPadsPhi() * GetNumberOfCPVPadsZ() ;
186 relid[0] = (Int_t) TMath::Ceil( id / nCPV ) ;
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() ) ;
192 else { // it is a PW04 crystal
194 relid[0] = phosmodulenumber ;
196 id -= ( phosmodulenumber - 1 ) * GetNPhi() * GetNZ() ;
197 relid[2] = (Int_t)TMath::Ceil( id / GetNZ() ) ;
198 relid[3] = (Int_t)( id - ( relid[2] - 1 ) * GetNZ() ) ;
203 //____________________________________________________________________________
204 void AliPHOSGeometry::EmcModuleCoverage(const Int_t mod, Double_t & tm, Double_t & tM, Double_t & pm, Double_t & pM, Option_t * opt) const
206 // calculates the angular coverage in theta and phi of one EMC (=PHOS) module
209 if ( opt == Radian() )
211 else if ( opt == Degre() )
212 conv = 180. / TMath::Pi() ;
214 cout << "<I> AliPHOSGeometry::EmcXtalCoverage : " << opt << " unknown option; result in radian " << endl ;
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.)
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 ;
230 angle = TMath::ATan( z0 / y0 ) ;
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 ;
238 //____________________________________________________________________________
239 void AliPHOSGeometry::EmcXtalCoverage(Double_t & theta, Double_t & phi, Option_t * opt) const
241 // calculates the angular coverage in theta and phi of a single crystal in a EMC(=PHOS) module
244 if ( opt == Radian() )
246 else if ( opt == Degre() )
247 conv = 180. / TMath::Pi() ;
249 cout << "<I> AliPHOSGeometry::EmcXtalCoverage : " << opt << " unknown option; result in radian " << endl ;
253 Float_t y0 = GetIPtoCrystalSurface() ;
254 theta = 2 * TMath::ATan( GetCrystalSize(2) / (2 * y0) ) * conv ;
255 phi = 2 * TMath::ATan( GetCrystalSize(0) / (2 * y0) ) * conv ;
259 //____________________________________________________________________________
260 void AliPHOSGeometry::GetGlobal(const AliRecPoint* RecPoint, TVector3 & gpos, TMatrix & gmat) const
262 // Calculates the coordinates of a RecPoint and the error matrix in the ALICE global coordinate system
264 AliPHOSRecPoint * tmpPHOS = (AliPHOSRecPoint *) RecPoint ;
265 TVector3 localposition ;
267 tmpPHOS->GetLocalPosition(gpos) ;
270 if ( tmpPHOS->IsEmc() ) // it is a EMC crystal
271 { gpos.SetY( - GetIPtoCrystalSurface()) ;
276 gpos.SetY(- GetIPtoUpperCPVsurface() ) ;
279 Float_t phi = GetPHOSAngle( tmpPHOS->GetPHOSMod()) ;
280 Double_t const kRADDEG = 180.0 / kPI ;
281 Float_t rphi = phi / kRADDEG ;
284 rot.RotateZ(-rphi) ; // a rotation around Z by angle
286 TRotation dummy = rot.Invert() ; // to transform from original frame to rotate frame
287 gpos.Transform(rot) ; // rotate the baby
291 //____________________________________________________________________________
292 void AliPHOSGeometry::GetGlobal(const AliRecPoint* RecPoint, TVector3 & gpos) const
294 // Calculates the coordinates of a RecPoint in the ALICE global coordinate system
296 AliPHOSRecPoint * tmpPHOS = (AliPHOSRecPoint *) RecPoint ;
297 TVector3 localposition ;
298 tmpPHOS->GetLocalPosition(gpos) ;
301 if ( tmpPHOS->IsEmc() ) // it is a EMC crystal
302 { gpos.SetY( - GetIPtoCrystalSurface() ) ;
306 gpos.SetY(- GetIPtoUpperCPVsurface() ) ;
309 Float_t phi = GetPHOSAngle( tmpPHOS->GetPHOSMod()) ;
310 Double_t const kRADDEG = 180.0 / kPI ;
311 Float_t rphi = phi / kRADDEG ;
314 rot.RotateZ(-rphi) ; // a rotation around Z by angle
316 TRotation dummy = rot.Invert() ; // to transform from original frame to rotate frame
317 gpos.Transform(rot) ; // rotate the baby
320 //____________________________________________________________________________
321 void AliPHOSGeometry::ImpactOnEmc(const Double_t theta, const Double_t phi, Int_t & ModuleNumber, Double_t & z, Double_t & x) const
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
326 // searches for the PHOS EMC module
328 Double_t tm, tM, pm, pM ;
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 ;
336 if ( ModuleNumber != 0 ) {
337 Float_t phi0 = GetPHOSAngle(ModuleNumber) * (TMath::Pi() / 180.) + 1.5 * TMath::Pi() ;
338 Float_t y0 = GetIPtoCrystalSurface() ;
339 Double_t angle = phi - phi0;
340 x = y0 * TMath::Tan(angle) ;
341 angle = theta - TMath::Pi() / 2 ;
342 z = y0 * TMath::Tan(angle) ;
346 //____________________________________________________________________________
347 Bool_t AliPHOSGeometry::RelToAbsNumbering(const Int_t * relid, Int_t & AbsId) const
349 // Converts the relative numbering into the absolute numbering
351 // AbsId = from 1 to fNModules * fNPhi * fNZ
353 // AbsId = from N(total PHOS crystals) + 1
354 // to NCPVModules * fNumberOfCPVPadsPhi * fNumberOfCPVPadsZ
358 if ( relid[1] == 0 ) { // it is a Phos crystal
360 ( relid[0] - 1 ) * GetNPhi() * GetNZ() // the offset of PHOS modules
361 + ( relid[2] - 1 ) * GetNZ() // the offset along phi
362 + relid[3] ; // the offset along z
364 else { // it is a CPV pad
365 AbsId = GetNPhi() * GetNZ() * GetNModules() // the offset to separate EMCA crystals from CPV pads
366 + ( relid[0] - 1 ) * GetNumberOfCPVPadsPhi() * GetNumberOfCPVPadsZ() // the pads offset of PHOS modules
367 + ( relid[2] - 1 ) * GetNumberOfCPVPadsZ() // the pads offset of a CPV row
368 + relid[3] ; // the column number
374 //____________________________________________________________________________
376 void AliPHOSGeometry::RelPosInAlice(const Int_t id, TVector3 & pos ) const
378 // Converts the absolute numbering into the global ALICE coordinate system
383 AbsToRelNumbering(id , relid) ;
385 Int_t phosmodule = relid[0] ;
389 if ( relid[1] == 0 ) // it is a PbW04 crystal
390 y0 = - GetIPtoCrystalSurface() ;
392 y0 = - GetIPtoUpperCPVsurface() ;
395 RelPosInModule(relid, x, z) ;
401 Float_t phi = GetPHOSAngle( phosmodule) ;
402 Double_t const kRADDEG = 180.0 / kPI ;
403 Float_t rphi = phi / kRADDEG ;
406 rot.RotateZ(-rphi) ; // a rotation around Z by angle
408 TRotation dummy = rot.Invert() ; // to transform from original frame to rotate frame
410 pos.Transform(rot) ; // rotate the baby
413 //____________________________________________________________________________
414 void AliPHOSGeometry::RelPosInModule(const Int_t * relid, Float_t & x, Float_t & z) const
416 // Converts the relative numbering into the local PHOS-module (x, z) coordinates
417 // Note: sign of z differs from that in the previous version (Yu.Kharlov, 12 Oct 2000)
419 Int_t row = relid[2] ; //offset along x axis
420 Int_t column = relid[3] ; //offset along z axis
423 if ( relid[1] == 0 ) { // its a PbW04 crystal
424 x = - ( GetNPhi()/2. - row + 0.5 ) * GetCrystalSize(0) ; // position of Xtal with respect
425 z = ( GetNZ() /2. - column + 0.5 ) * GetCrystalSize(2) ; // of center of PHOS module
428 x = - ( GetNumberOfCPVPadsPhi()/2. - row - 0.5 ) * GetPadSizePhi() ; // position of pad with respect
429 z = ( GetNumberOfCPVPadsZ() /2. - column - 0.5 ) * GetPadSizeZ() ; // of center of PHOS module