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AliMUONv1.cxx
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15 
16 /* $Id$ */
17 
18 //-----------------------------------------------------------------------------
19 // Class AliMUONv1
20 // --------------------
21 // AliDetector class for MUON subsystem which implements
22 // functions for simulation
23 //-----------------------------------------------------------------------------
24 
25 #include "AliMUONv1.h"
26 #include "AliMUONConstants.h"
27 #include "AliMUONResponseFactory.h"
28 #include "AliMUONHit.h"
29 #include "AliMUONGeometryBuilder.h"
30 #include "AliMUONGeometry.h"
32 #include "AliMUONGeometryModule.h"
33 #include "AliMUONStringIntMap.h"
35 
36 #include "AliMpCDB.h"
37 #include "AliMpDEManager.h"
38 
39 #include "AliConst.h"
40 #include "AliMagF.h"
41 #include "AliRun.h"
42 #include "AliMC.h"
43 #include "AliTrackReference.h"
44 #include "AliLog.h"
45 
46 #include <TClonesArray.h>
47 #include <TF1.h>
48 #include <TF2.h>
49 #include <TGeoGlobalMagField.h>
50 #include <TGeoMatrix.h>
51 #include <TRandom.h>
52 #include <TRandom.h>
53 #include <TVirtualMC.h>
54 
55 #include <string>
56 
57 #include "AliMUONVHitStore.h"
58 
59 using std::endl;
60 using std::cout;
61 using std::setw;
65 
66 //___________________________________________
68  : AliMUON(),
69  fAngleEffect(kTRUE),
70  fMagEffect(kTRUE),
71  fStepMaxInActiveGas(0.6),
72  fStepSum(0x0),
73  fDestepSum(0x0),
74  fTrackMomentum(),
75  fTrackPosition(),
76  fElossRatio(0x0),
77  fAngleEffect10(0x0),
78  fAngleEffectNorma(0x0),
79  fMagAngleEffectNorma(0x0)
80 {
82 
83  AliDebug(1,Form("default (empty) ctor this=%p",this));
84 }
85 
86 //___________________________________________
87 AliMUONv1::AliMUONv1(const char *name, const char* title)
88 : AliMUON(name, title),
89  fAngleEffect(kTRUE),
90  fMagEffect(kTRUE),
91  fStepMaxInActiveGas(0.6),
92  fStepSum(0x0),
93  fDestepSum(0x0),
94  fTrackMomentum(),
95  fTrackPosition(),
96  fElossRatio(0x0),
97  fAngleEffect10(0x0),
98  fAngleEffectNorma(0x0),
99  fMagAngleEffectNorma(0x0)
100 {
102 
103  AliDebug(1,Form("ctor this=%p",this));
104 
105  // Load mapping
106  if ( ! AliMpCDB::LoadMpSegmentation() ) {
107  AliFatal("Could not access mapping from OCDB !");
108  }
109 
110  // By default include all stations
111 
112  fStepSum = new Float_t [AliMUONConstants::NCh()];
113  fDestepSum = new Float_t [AliMUONConstants::NCh()];
114  for (Int_t i=0; i<AliMUONConstants::NCh(); i++) {
115  fStepSum[i] =0.0;
116  fDestepSum[i]=0.0;
117  }
118  // Ratio of particle mean eloss with respect MIP's Khalil Boudjemline, sep 2003, PhD.Thesis and Particle Data Book
119  fElossRatio = new TF1("ElossRatio","[0]+[1]*x+[2]*x*x+[3]*x*x*x+[4]*x*x*x*x",0.5,5.);
120  fElossRatio->SetParameter(0,1.02138);
121  fElossRatio->SetParameter(1,-9.54149e-02);
122  fElossRatio->SetParameter(2,+7.83433e-02);
123  fElossRatio->SetParameter(3,-9.98208e-03);
124  fElossRatio->SetParameter(4,+3.83279e-04);
125 
126  // Angle effect in tracking chambers at theta =10 degres as a function of ElossRatio (Khalil BOUDJEMLINE sep 2003 Ph.D Thesis) (in micrometers)
127  fAngleEffect10 = new TF1("AngleEffect10","[0]+[1]*x+[2]*x*x",0.5,3.0);
128  fAngleEffect10->SetParameter(0, 1.90691e+02);
129  fAngleEffect10->SetParameter(1,-6.62258e+01);
130  fAngleEffect10->SetParameter(2,+1.28247e+01);
131  // Angle effect: Normalisation form theta=10 degres to theta between 0 and 10 (Khalil BOUDJEMLINE sep 2003 Ph.D Thesis)
132  // Angle with respect to the wires assuming that chambers are perpendicular to the z axis.
133  fAngleEffectNorma = new TF1("AngleEffectNorma","[0]+[1]*x+[2]*x*x+[3]*x*x*x",0.0,10.0);
134  fAngleEffectNorma->SetParameter(0,4.148);
135  fAngleEffectNorma->SetParameter(1,-6.809e-01);
136  fAngleEffectNorma->SetParameter(2,5.151e-02);
137  fAngleEffectNorma->SetParameter(3,-1.490e-03);
138 
139  // Magnetic field effect: Normalisation form theta=16 degres (eq. 10 degrees B=0) to theta between -20 and 20 (Lamia Benhabib jun 2006 )
140  // Angle with respect to the wires assuming that chambers are perpendicular to the z axis.
141  fMagAngleEffectNorma = new TF2("MagAngleEffectNorma","121.24/(([1]+[2]*abs(y))+[3]*abs(x-[0]*y)+[4]*abs((x-[0]*y)*(x-[0]*y))+[5]*abs((x-[0]*y)*(x-[0]*y)*(x-[0]*y))+[6]*abs((x-[0]*y)*(x-[0]*y)*(x-[0]*y)*(x-[0]*y)))",-20.0,20.0,-1.,1.);
142  fMagAngleEffectNorma->SetParameters(8.6995, 25.4022, 13.8822, 2.4717, 1.1551, -0.0624, 0.0012);
143 }
144 
145 //___________________________________________
147 {
149 
150  AliDebug(1,Form("dtor this=%p",this));
151  delete [] fStepSum;
152  delete [] fDestepSum;
153  delete fElossRatio;
154  delete fAngleEffect10;
155  delete fAngleEffectNorma;
156  delete fMagAngleEffectNorma;
157 }
158 
159 //__________________________________________________
161 {
163 
165 }
166 
167 //________________________________________________________________
169 {
171 
173 }
174 
175 //________________________________________________________________
177 {
179 
180  // Load mapping
181  if ( ! AliMpCDB::LoadMpSegmentation() ) {
182  AliFatal("Could not access mapping from OCDB !");
183  }
184 
186 }
187 
188 //________________________________________________________________
190 {
192 
194 }
195 
196 
197 //___________________________________________
199 {
201 
202  AliDebug(1,"Start Init for version 1 - CPC chamber type");
203 
205  AliDebug(1,"Finished Init for version 1 - CPC chamber type");
206 
207 
208  // Build segmentation
209  // using geometry parametrisation
210  //
211  // Build response
212  //
213  AliMUONResponseFactory respFactory("default", fIsTailEffect);
214  respFactory.Build(this);
215 
216 }
217 
218 //__________________________________________________________________
219 Int_t AliMUONv1::GetGeomModuleId(Int_t volId) const
220 {
224 
225  for (Int_t i = 0; i < AliMUONConstants::NGeomModules(); i++) {
226  if ( GetGeometry()->GetModule(i)->IsSensitiveVolume(volId) )
227  return i;
228  }
229 
230  return -1;
231 }
232 
233 //_______________________________________________________________________________
235 {
238 
239  TString path = "";
240  TString name;
241  Int_t copyNo;
242  Int_t imother = 0;
243  do {
244  name = TVirtualMC::GetMC()->CurrentVolOffName(imother);
245  TVirtualMC::GetMC()->CurrentVolOffID(imother++, copyNo);
246  TString add = "/";
247  add += name;
248  add += "_";
249  add += copyNo;
250  path.Insert(0,add);
251  }
252  while ( name != TString("ALIC") );
253 
254  return path;
255 }
256 
257 //_______________________________________________________________________________
259 {
261 
262  // Only charged tracks
263  if( !(TVirtualMC::GetMC()->TrackCharge()) ) return;
264  // Only charged tracks
265 
266  // Only gas gap inside chamber
267  // Tag chambers and record hits when track enters
268  static Int_t idvol=-1, iEnter = 0;
269  Int_t copy;
270  const Float_t kBig = 1.e10;
271  static Double_t xyzEnter[3];
272 
273  //
274  // Only gas gap inside chamber
275  // Tag chambers and record hits when track enters
276  Int_t id=TVirtualMC::GetMC()->CurrentVolID(copy);
277  Int_t iGeomModule = GetGeomModuleId(id);
278  if (iGeomModule == -1) return;
279 
280  // Detection elements id
281  const AliMUONGeometryModule* kGeometryModule
282  = GetGeometry()->GetModule(iGeomModule);
283  AliMUONGeometryDetElement* detElement
284  = kGeometryModule->FindBySensitiveVolume(CurrentVolumePath());
285 
286  if (!detElement && iGeomModule < AliMUONConstants::NGeomModules()-2) {
287  iGeomModule++;
288  const AliMUONGeometryModule* kGeometryModule2
289  = GetGeometry()->GetModule(iGeomModule);
290  detElement
291  = kGeometryModule2->FindBySensitiveVolume(CurrentVolumePath());
292  }
293 
294  Int_t detElemId = 0;
295  if (detElement) detElemId = detElement->GetUniqueID();
296 
297  if (!detElemId) {
298  AliErrorStream()
299  << "Geometry module id: "
300  << setw(3) << iGeomModule << " "
301  << "Current SV: "
302  << CurrentVolumePath()
303  << " detElemId: "
304  << setw(5) << detElemId
305  << endl;
306  Double_t x, y, z;
307  TVirtualMC::GetMC()->TrackPosition(x, y, z);
308  AliErrorStream()
309  << " global position: "
310  << x << ", " << y << ", " << z
311  << endl;
312  AliErrorStream() << "DetElemId not identified." << endl;
313  }
314 
315  Int_t iChamber = AliMpDEManager::GetChamberId(detElemId) + 1;
316  idvol = iChamber -1;
317 
318  // Filling TrackRefs file for MUON. Our Track references are the active volume of the chambers
319  if ( (TVirtualMC::GetMC()->IsTrackEntering() || TVirtualMC::GetMC()->IsTrackExiting() ) ) {
320  AliTrackReference* trackReference
321  = AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber(), AliTrackReference::kMUON);
322  trackReference->SetUserId(detElemId);
323  }
324 
325  if( TVirtualMC::GetMC()->IsTrackEntering() ) {
326  Float_t theta = fTrackMomentum.Theta();
327  if ( fIsMaxStep && (TMath::Pi()-theta)*kRaddeg>=15. ) {
328  TVirtualMC::GetMC()->SetMaxStep(fStepMaxInActiveGas); // We use Pi-theta because z is negative
329  }
330  iEnter = 1;
331  TVirtualMC::GetMC()->TrackPosition(xyzEnter[0], xyzEnter[1], xyzEnter[2]); // save coordinates of entrance point
332  }
333 
334  // AliDebug(1,
335  // Form("Active volume found %d chamber %d Z chamber is %f ",idvol,iChamber,
336  // ( (AliMUONChamber*)(*fChambers)[idvol])->Z())) ;
337  // Particule id and mass,
338  Int_t ipart = TVirtualMC::GetMC()->TrackPid();
339  Float_t mass = TVirtualMC::GetMC()->TrackMass();
340 
341  fDestepSum[idvol]+=TVirtualMC::GetMC()->Edep();
342  // Get current particle id (ipart), track position (pos) and momentum (mom)
343  if ( fStepSum[idvol]==0.0 ) TVirtualMC::GetMC()->TrackMomentum(fTrackMomentum);
344  fStepSum[idvol]+=TVirtualMC::GetMC()->TrackStep();
345 
346  // if (AliDebugLevel()) {
347  // AliDebug(1,Form("Step, iChamber %d, Particle %d, theta %f phi %f mass %f StepSum %f eloss %g",
348  // iChamber,ipart, fTrackMomentum.Theta()*kRaddeg, fTrackMomentum.Phi()*kRaddeg,
349  // mass, fStepSum[idvol], TVirtualMC::GetMC()->Edep()));
350  // AliDebug(1,Form("Step:Track Momentum %f %f %f", fTrackMomentum.X(), fTrackMomentum.Y(),
351  // fTrackMomentum.Z()));
352  // TVirtualMC::GetMC()->TrackPosition(fTrackPosition);
353  // AliDebug(1,Form("Step: Track Position %f %f %f",fTrackPosition.X(),
354  // fTrackPosition.Y(),fTrackPosition.Z())) ;
355  //}
356 
357  // Track left chamber or StepSum larger than fStepMaxInActiveGas
358  if ( TVirtualMC::GetMC()->IsTrackExiting() ||
359  TVirtualMC::GetMC()->IsTrackStop() ||
360  TVirtualMC::GetMC()->IsTrackDisappeared()||
361  (fStepSum[idvol]>fStepMaxInActiveGas) ) {
362 
363  if ( fIsMaxStep &&
364  ( TVirtualMC::GetMC()->IsTrackExiting() ||
365  TVirtualMC::GetMC()->IsTrackStop() ||
366  TVirtualMC::GetMC()->IsTrackDisappeared() ) ) TVirtualMC::GetMC()->SetMaxStep(kBig);
367  if (fDestepSum[idvol] == 0) {
368  // AZ - no energy release
369  fStepSum[idvol] = 0; // Reset for the next event
370  iEnter = 0;
371  return;
372  }
373 
374  TVirtualMC::GetMC()->TrackPosition(fTrackPosition);
375  Float_t theta = fTrackMomentum.Theta();
376  Float_t phi = fTrackMomentum.Phi();
377 
378  Int_t merge = 0;
379  Double_t xyz0[3]={0}, xyz1[3]={0}, tmp[3]={0};
380  if (TVirtualMC::GetMC()->IsTrackExiting() && iEnter != 0) {
381  // AZ - this code is to avoid artificial hit splitting at the
382  // "fake" boundary inside the same chamber. It will still produce
383  // 2 hits but with the same coordinates (at the wire) to allow
384  // their merging at the digitization level.
385 
386  // Only for a track going from the entrance to the exit from the volume
387  // Get local coordinates
388  TVirtualMC::GetMC()->Gmtod(xyzEnter, xyz0, 1); // local coord. at the entrance
389 
390  fTrackPosition.Vect().GetXYZ(tmp);
391  TVirtualMC::GetMC()->Gmtod(tmp, xyz1, 1); // local coord. at the exit
392  Float_t dx = xyz0[0] - xyz1[0];
393  Float_t dy = xyz0[1] - xyz1[1];
394  Float_t thLoc = TMath::ATan2 (TMath::Sqrt(dx*dx+dy*dy), TMath::Abs(xyz0[2]-xyz1[2]));
395  if (thLoc * TMath::RadToDeg() < 15) merge = 1;
396  }
397 
398  if (merge) {
399  Double_t dz = -0.5;
400  if (xyz1[2] != xyz0[2]) dz = xyz0[2] / (xyz1[2] - xyz0[2]);
401  tmp[0] = xyz0[0] - (xyz1[0] - xyz0[0]) * dz; // local coord. at the wire
402  tmp[1] = xyz0[1] - (xyz1[1] - xyz0[1]) * dz;
403  tmp[2] = xyz0[2] - (xyz1[2] - xyz0[2]) * dz;
404  TVirtualMC::GetMC()->Gdtom(tmp, xyz1, 1); // global coord. at the wire
405  fTrackPosition.SetXYZT(xyz1[0], xyz1[1], xyz1[2], fTrackPosition.T());
406  } else {
407  TLorentzVector backToWire( fStepSum[idvol]/2.*sin(theta)*cos(phi),
408  fStepSum[idvol]/2.*sin(theta)*sin(phi),
409  fStepSum[idvol]/2.*cos(theta),0.0 );
410  fTrackPosition-=backToWire;
411  //printf(" %d %d %d %f %d \n", TVirtualMC::GetMC()->IsTrackExiting(), TVirtualMC::GetMC()->IsTrackStop(), TVirtualMC::GetMC()->IsTrackDisappeared(), fStepSum[idvol], iEnter);
412  // AliDebug(1,
413  // Form("Track Position %f %f %f",fTrackPosition.X(),fTrackPosition.Y(),fTrackPosition.Z()));
414  // AliDebug(1,
415  // Form("Exit: Track backToWire %f %f %f",backToWire.X(),backToWire.Y(),backToWire.Z())) ;
416  }
417 
418  //-------------- Angle effect
419  // Ratio between energy loss of particle and Mip as a function of BetaGamma of particle (Energy/Mass)
420 
421  Float_t betaxGamma = fTrackMomentum.P()/mass;// pc/mc2
422  Float_t sigmaEffect10degrees;
423  Float_t sigmaEffectThetadegrees;
424  Float_t eLossParticleELossMip;
425  Float_t yAngleEffect=0.;
426  Float_t thetawires = TMath::ASin( TMath::Sin(TMath::Pi()-theta) * TMath::Sin(phi) ) ;// We use Pi-theta because z is negative
427  Double_t bField[3] = {0};
428  fTrackPosition.Vect().GetXYZ(tmp);
429  TGeoGlobalMagField::Instance()->Field(tmp,bField);
430 
431  if (fAngleEffect && !fMagEffect){
432  thetawires = TMath::Abs(thetawires);
433  if ( (betaxGamma >3.2) && (thetawires*kRaddeg<=15.) ) {
434  betaxGamma=TMath::Log(betaxGamma);
435  eLossParticleELossMip = fElossRatio->Eval(betaxGamma);
436  // 10 degrees is a reference for a model (arbitrary)
437  sigmaEffect10degrees=fAngleEffect10->Eval(eLossParticleELossMip);// in micrometers
438  // Angle with respect to the wires assuming that chambers are perpendicular to the z axis.
439  sigmaEffectThetadegrees = sigmaEffect10degrees/fAngleEffectNorma->Eval(thetawires*kRaddeg); // For 5mm gap
440  if ( (iChamber==1) || (iChamber==2) )
441  sigmaEffectThetadegrees/=(1.09833e+00+1.70000e-02*(thetawires*kRaddeg)); // The gap is different (4mm)
442  yAngleEffect=1.e-04*gRandom->Gaus(0,sigmaEffectThetadegrees); // Error due to the angle effect in cm
443  }
444  }
445  else if (fAngleEffect && fMagEffect) {
446  if ( (betaxGamma >3.2) && (TMath::Abs(thetawires*kRaddeg)<=15.) ) {
447  betaxGamma=TMath::Log(betaxGamma);
448  eLossParticleELossMip = fElossRatio->Eval(betaxGamma);
449  // 10 degrees is a reference for a model (arbitrary)
450  sigmaEffect10degrees=fAngleEffect10->Eval(eLossParticleELossMip);// in micrometers
451  // Angle with respect to the wires assuming that chambers are perpendicular to the z axis.
452  sigmaEffectThetadegrees = sigmaEffect10degrees/fMagAngleEffectNorma->Eval(thetawires*kRaddeg,bField[0]/10.); // For 5mm gap
453  if ( (iChamber==1) || (iChamber==2) )
454  sigmaEffectThetadegrees/=(1.09833e+00+1.70000e-02*(thetawires*kRaddeg)); // The gap is different (4mm)
455  yAngleEffect=1.e-04*gRandom->Gaus(0,sigmaEffectThetadegrees); // Error due to the angle effect in cm
456  }
457  }
458 
459  AliMUONHit hit(fIshunt,
460  gAlice->GetMCApp()->GetCurrentTrackNumber(),
461  detElemId, ipart,
462  fTrackPosition.X(),
463  fTrackPosition.Y()+yAngleEffect,
464  fTrackPosition.Z(),
465  TVirtualMC::GetMC()->TrackTime(),
466  fTrackMomentum.P(),
467  theta,
468  phi,
469  fStepSum[idvol],
470  fDestepSum[idvol],
471  fTrackPosition.X(),
472  fTrackPosition.Y(),
473  fTrackPosition.Z());
474 
475  fHitStore->Add(hit);
476 
477  fStepSum[idvol] =0; // Reset for the next event
478  fDestepSum[idvol]=0; // Reset for the next event
479  iEnter = 0;
480  }
481 }
const AliMUONGeometry * GetGeometry() const
Definition: AliMUON.cxx:230
AliMUONVHitStore * fHitStore
! container of hits
Definition: AliMUON.h:192
TString CurrentVolumePath() const
Definition: AliMUONv1.cxx:234
Bool_t fAngleEffect
Angle Effect along wires, Default is true.
Definition: AliMUONv1.h:62
virtual void UpdateInternalGeometry()
Definition: AliMUONv1.cxx:176
Float_t * fDestepSum
! Sum of energy deposits per chamber
Definition: AliMUONv1.h:68
AliMUONGeometryDetElement * FindBySensitiveVolume(const TString &volumePath) const
virtual void CreateMaterials()
Definition: AliMUONv1.cxx:168
virtual void Init()
Definition: AliMUONv1.cxx:198
virtual void AddAlignableVolumes() const
Definition: AliMUONv1.cxx:189
Float_t * fStepSum
! Sum of track steps per chamber
Definition: AliMUONv1.h:67
TF1 * fElossRatio
Ratio of particle mean eloss with respect MIP's.
Definition: AliMUONv1.h:72
TF1 * fAngleEffectNorma
Angle effect: Normalisation form theta=10 degres to theta between 0 and 10 (Khalil BOUDJEMLINE sep 20...
Definition: AliMUONv1.h:74
void InitGeometry()
Initialize geometry.
AliDetector class for MUON subsystem providing simulation data management.
Definition: AliMUON.h:37
TF2 * fMagAngleEffectNorma
Magnetic field effect: Normalisation from theta=16 degres to theta between -20 and 20 (Lamia Benhabib...
Definition: AliMUONv1.h:75
TLorentzVector fTrackPosition
Position of the particle exiting the active gas of chamber.
Definition: AliMUONv1.h:71
Bool_t fIsTailEffect
Switch to turn on/off the tail effect.
Definition: AliMUON.h:185
ClassImp(TPCGenInfo)
Definition: AliTPCCmpNG.C:254
Factory for muon response.
static Int_t GetChamberId(Int_t detElemId, Bool_t warn=true)
AliDetector class for MUON subsystem which implements functions for simulation.
Definition: AliMUONv1.h:24
Float_t fStepMaxInActiveGas
Step max in active gas default 0.6cm.
Definition: AliMUONv1.h:64
static Int_t NGeomModules()
Return number of geometry modules.
const AliMUONGeometryTransformer * GetGeometryTransformer() const
Definition: AliMUON.cxx:243
virtual Bool_t Add(TObject *object)
Add an object, if of type AliMUONHit.
AliRun * gAlice
virtual ~AliMUONv1()
Definition: AliMUONv1.cxx:146
AliMUONGeometryBuilder * fGeometryBuilder
Geometry builder.
Definition: AliMUON.h:160
static Int_t NCh()
Return number of chambers.
virtual Int_t GetGeomModuleId(Int_t volId) const
Definition: AliMUONv1.cxx:219
Bool_t fMagEffect
Magnetic Field Effect along wires, Default is true.
Definition: AliMUONv1.h:63
TLorentzVector fTrackMomentum
Momentum of the particle entering in the active gas of chamber.
Definition: AliMUONv1.h:70
MonteCarlo hit.
Definition: AliMUONHit.h:24
const AliMUONGeometryModule * GetModule(Int_t index, Bool_t warn=true) const
Geometry parameters for detector module.
TF1 * fAngleEffect10
Angle effect in tracking chambers at theta =10 degres as a function of ElossRatio (Khalil BOUDJEMLINE...
Definition: AliMUONv1.h:73
virtual void StepManager()
Definition: AliMUONv1.cxx:258
Class for storing detection element transformations.
Bool_t IsSensitiveVolume(Int_t volId) const
static Bool_t LoadMpSegmentation(Bool_t warn=false)
Definition: AliMpCDB.cxx:113
virtual void CreateGeometry()
Definition: AliMUONv1.cxx:160
Bool_t fIsMaxStep
Flag to inactivate calls to TVirtualMC::GetMC()->SetMaxStep.
Definition: AliMUON.h:178