1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * SigmaEffect_thetadegrees *
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 purpeateose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
18 // --------------------
20 // --------------------
21 // AliDetector class for MUON subsystem which implements
22 // functions for simulation
24 #include "AliMUONv1.h"
25 #include "AliMUONConstants.h"
26 #include "AliMUONSegFactory.h"
27 #include "AliMUONResponseFactory.h"
28 #include "AliMUONSegmentation.h"
29 #include "AliMUONHit.h"
30 #include "AliMUONTriggerCircuit.h"
31 #include "AliMUONGeometryBuilder.h"
32 #include "AliMUONGeometry.h"
33 #include "AliMUONGeometryTransformer.h"
34 #include "AliMUONGeometryModule.h"
35 #include "AliMUONStringIntMap.h"
36 #include "AliMUONGeometryDetElement.h"
46 #include <TClonesArray.h>
48 #include <TVirtualMC.h>
49 #include <TGeoMatrix.h>
55 //___________________________________________
56 AliMUONv1::AliMUONv1()
58 fStepManagerVersionOld(kTRUE),
59 fStepManagerVersionDE(kTRUE),
61 fStepMaxInActiveGas(0.6),
68 fAngleEffectNorma(0x0)
70 /// Default constructor
72 AliDebug(1,Form("default (empty) ctor this=%p",this));
75 //___________________________________________
76 AliMUONv1::AliMUONv1(const char *name, const char *title,
77 const char* sDigitizerClassName,
78 const char* digitizerClassName)
79 : AliMUON(name,title,sDigitizerClassName,digitizerClassName),
80 fStepManagerVersionOld(kTRUE),
81 fStepManagerVersionDE(kTRUE),
83 fStepMaxInActiveGas(0.6),
90 fAngleEffectNorma(0x0)
92 /// Standard onstructor
94 AliDebug(1,Form("ctor this=%p",this));
96 // By default include all stations
98 fStepSum = new Float_t [AliMUONConstants::NCh()];
99 fDestepSum = new Float_t [AliMUONConstants::NCh()];
100 for (Int_t i=0; i<AliMUONConstants::NCh(); i++) {
104 // Ratio of particle mean eloss with respect MIP's Khalil Boudjemline, sep 2003, PhD.Thesis and Particle Data Book
105 fElossRatio = new TF1("ElossRatio","[0]+[1]*x+[2]*x*x+[3]*x*x*x+[4]*x*x*x*x",0.5,5.);
106 fElossRatio->SetParameter(0,1.02138);
107 fElossRatio->SetParameter(1,-9.54149e-02);
108 fElossRatio->SetParameter(2,+7.83433e-02);
109 fElossRatio->SetParameter(3,-9.98208e-03);
110 fElossRatio->SetParameter(4,+3.83279e-04);
112 // Angle effect in tracking chambers at theta =10 degres as a function of ElossRatio (Khalil BOUDJEMLINE sep 2003 Ph.D Thesis) (in micrometers)
113 fAngleEffect10 = new TF1("AngleEffect10","[0]+[1]*x+[2]*x*x",0.5,3.0);
114 fAngleEffect10->SetParameter(0, 1.90691e+02);
115 fAngleEffect10->SetParameter(1,-6.62258e+01);
116 fAngleEffect10->SetParameter(2,+1.28247e+01);
117 // Angle effect: Normalisation form theta=10 degres to theta between 0 and 10 (Khalil BOUDJEMLINE sep 2003 Ph.D Thesis)
118 // Angle with respect to the wires assuming that chambers are perpendicular to the z axis.
119 fAngleEffectNorma = new TF1("AngleEffectNorma","[0]+[1]*x+[2]*x*x+[3]*x*x*x",0.0,10.0);
120 fAngleEffectNorma->SetParameter(0,4.148);
121 fAngleEffectNorma->SetParameter(1,-6.809e-01);
122 fAngleEffectNorma->SetParameter(2,5.151e-02);
123 fAngleEffectNorma->SetParameter(3,-1.490e-03);
126 //_____________________________________________________________________________
127 AliMUONv1::AliMUONv1(const AliMUONv1& right)
130 /// Copy constructor (not implemented)
132 AliFatal("Copy constructor not provided.");
135 //___________________________________________
136 AliMUONv1::~AliMUONv1()
140 AliDebug(1,Form("dtor this=%p",this));
142 delete [] fDestepSum;
144 delete fAngleEffect10;
145 delete fAngleEffectNorma;
148 //_____________________________________________________________________________
149 AliMUONv1& AliMUONv1::operator=(const AliMUONv1& right)
151 /// Assignement operator (not implemented)
153 // check assignement to self
154 if (this == &right) return *this;
156 AliFatal("Assignement operator not provided.");
161 //__________________________________________________
162 void AliMUONv1::CreateGeometry()
164 /// Construct geometry using geometry builder
166 fGeometryBuilder->CreateGeometry();
169 //________________________________________________________________
170 void AliMUONv1::CreateMaterials()
172 /// Construct materials using geometry builder
174 fGeometryBuilder->CreateMaterials();
177 //___________________________________________
178 void AliMUONv1::Init()
180 /// Initialize geometry
182 AliDebug(1,"Start Init for version 1 - CPC chamber type");
184 fGeometryBuilder->InitGeometry();
185 AliDebug(1,"Finished Init for version 1 - CPC chamber type");
188 std::string ftype(GetTitle());
190 // Build segmentation
191 // using geometry parametrisation
193 AliMUONSegFactory segFactory(GetGeometryTransformer());
194 fSegmentation = segFactory.CreateSegmentation(ftype);
196 if (!fSegmentation) {
197 AliFatal(Form("Wrong factory type : %s",ftype.c_str()));
202 AliMUONResponseFactory respFactory("default");
203 respFactory.Build(this);
206 // Initialize segmentation
208 fSegmentation->Init();
210 // Initialize trigger circuits
212 for (Int_t i=0; i<AliMUONConstants::NTriggerCircuit(); i++) {
213 AliMUONTriggerCircuit* c = (AliMUONTriggerCircuit*)(fTriggerCircuits->At(i));
220 //__________________________________________________________________
221 Int_t AliMUONv1::GetChamberId(Int_t volId) const
223 /// Check if the volume with specified volId is a sensitive volume (gas)
224 /// of some chamber and returns the chamber number;
225 /// if not sensitive volume - return 0.
227 for (Int_t i = 0; i < AliMUONConstants::NCh(); i++) {
228 if ( GetGeometry()->GetModule(i)->IsSensitiveVolume(volId) )
235 //_______________________________________________________________________________
236 TString AliMUONv1::CurrentVolumePath() const
238 /// Return current volume path
239 /// (Could be removed when this function is available via gMC)
246 name = gMC->CurrentVolOffName(imother);
247 gMC->CurrentVolOffID(imother++, copyNo);
254 while ( name != TString("ALIC") );
259 //_______________________________________________________________________________
260 void AliMUONv1::StepManager()
262 /// Step manager for the chambers
265 if (fStepManagerVersionDE) {
271 // Only charged tracks
272 if( !(gMC->TrackCharge()) ) return;
273 // Only charged tracks
275 // Only gas gap inside chamber
276 // Tag chambers and record hits when track enters
277 static Int_t idvol=-1;
281 const Float_t kBig = 1.e10;
285 // Only gas gap inside chamber
286 // Tag chambers and record hits when track enters
287 id=gMC->CurrentVolID(copy);
288 iChamber = GetChamberId(id);
291 if (idvol == -1) return;
293 // Filling TrackRefs file for MUON. Our Track references are the active volume of the chambers
294 if ( (gMC->IsTrackEntering() || gMC->IsTrackExiting() ) )
295 AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber());
297 if( gMC->IsTrackEntering() ) {
298 Float_t theta = fTrackMomentum.Theta();
299 if ((TMath::Pi()-theta)*kRaddeg>=15.) gMC->SetMaxStep(fStepMaxInActiveGas); // We use Pi-theta because z is negative
303 // Form("Active volume found %d chamber %d Z chamber is %f ",idvol,iChamber,
304 // ( (AliMUONChamber*)(*fChambers)[idvol])->Z()));
305 // Particule id and mass,
306 Int_t ipart = gMC->TrackPid();
307 Float_t mass = gMC->TrackMass();
309 fDestepSum[idvol]+=gMC->Edep();
310 // Get current particle id (ipart), track position (pos) and momentum (mom)
311 if ( fStepSum[idvol]==0.0 ) gMC->TrackMomentum(fTrackMomentum);
312 fStepSum[idvol]+=gMC->TrackStep();
314 // if(AliDebugLevel()) {
316 // Form("iChamber %d, Particle %d, theta %f phi %f mass %f StepSum %f eloss %g",
317 // iChamber,ipart, fTrackMomentum.Theta()*kRaddeg, fTrackMomentum.Phi()*kRaddeg,
318 // mass, fStepSum[idvol], gMC->Edep()));
320 // Form("Track Momentum %f %f %f", fTrackMomentum.X(), fTrackMomentum.Y(),
321 // fTrackMomentum.Z()));
322 // gMC->TrackPosition(fTrackPosition);
324 // Form("Track Position %f %f %f",fTrackPosition.X(),fTrackPosition.Y(),
325 // fTrackPosition.Z())) ;
328 // Track left chamber or StepSum larger than fStepMaxInActiveGas
329 if ( gMC->IsTrackExiting() ||
330 gMC->IsTrackStop() ||
331 gMC->IsTrackDisappeared()||
332 (fStepSum[idvol]>fStepMaxInActiveGas) ) {
334 if ( gMC->IsTrackExiting() ||
335 gMC->IsTrackStop() ||
336 gMC->IsTrackDisappeared() ) gMC->SetMaxStep(kBig);
338 gMC->TrackPosition(fTrackPosition);
339 Float_t theta = fTrackMomentum.Theta();
340 Float_t phi = fTrackMomentum.Phi();
342 TLorentzVector backToWire( fStepSum[idvol]/2.*sin(theta)*cos(phi),
343 fStepSum[idvol]/2.*sin(theta)*sin(phi),
344 fStepSum[idvol]/2.*cos(theta),0.0 );
345 // AliDebug(1,Form("Exit: Track Position %f %f %f",fTrackPosition.X(),
346 // fTrackPosition.Y(),fTrackPosition.Z())) ;
347 // AliDebug(1,Form("Exit: Track backToWire %f %f %f",backToWire.X(),
348 // backToWire.Y(),backToWire.Z()) ;
349 fTrackPosition-=backToWire;
351 //-------------- Angle effect
352 // Ratio between energy loss of particle and Mip as a function of BetaGamma of particle (Energy/Mass)
354 Float_t betaxGamma = fTrackMomentum.P()/mass;// pc/mc2
355 Float_t sigmaEffect10degrees;
356 Float_t sigmaEffectThetadegrees;
357 Float_t eLossParticleELossMip;
358 Float_t yAngleEffect=0.;
359 Float_t thetawires = TMath::Abs( TMath::ASin( TMath::Sin(TMath::Pi()-theta) * TMath::Sin(phi) ) );// We use Pi-theta because z is negative
363 if ( (betaxGamma >3.2) && (thetawires*kRaddeg<=15.) ) {
364 betaxGamma=TMath::Log(betaxGamma);
365 eLossParticleELossMip = fElossRatio->Eval(betaxGamma);
366 // 10 degrees is a reference for a model (arbitrary)
367 sigmaEffect10degrees=fAngleEffect10->Eval(eLossParticleELossMip);// in micrometers
368 // Angle with respect to the wires assuming that chambers are perpendicular to the z axis.
369 sigmaEffectThetadegrees = sigmaEffect10degrees/fAngleEffectNorma->Eval(thetawires*kRaddeg); // For 5mm gap
370 if ( (iChamber==1) || (iChamber==2) )
371 sigmaEffectThetadegrees/=(1.09833e+00+1.70000e-02*(thetawires*kRaddeg)); // The gap is different (4mm)
372 yAngleEffect=1.e-04*gRandom->Gaus(0,sigmaEffectThetadegrees); // Error due to the angle effect in cm
376 // Detection elements ids
377 const AliMUONGeometryModule* kGeometryModule
378 = GetGeometry()->GetModule(iChamber-1);
380 AliMUONGeometryDetElement* detElement
381 = kGeometryModule->FindBySensitiveVolume(CurrentVolumePath());
384 if (detElement) detElemId = detElement->GetUniqueID();
387 cerr << "Chamber id: "
388 << setw(3) << iChamber << " "
390 << CurrentVolumePath()
392 << setw(5) << detElemId
395 gMC->TrackPosition(x, y, z);
396 cerr << " global position: "
397 << x << ", " << y << ", " << z
399 AliWarning("DetElemId not identified.");
402 // One hit per chamber
403 GetMUONData()->AddHit(fIshunt,
404 gAlice->GetMCApp()->GetCurrentTrackNumber(),
407 fTrackPosition.Y()+yAngleEffect,
419 // if (AliDebugLevel()){
420 // AliDebug(1,Form("Exit: Particle exiting from chamber %d",iChamber));
421 // AliDebug(1,Form("Exit: StepSum %f eloss geant %g ",fStepSum[idvol],fDestepSum[idvol]));
422 // AliDebug(1,Form("Exit: Track Position %f %f %f",fTrackPosition.X(),fTrackPosition.Y(),fTrackPosition.Z())) ;
424 fStepSum[idvol] =0; // Reset for the next event
425 fDestepSum[idvol]=0; // Reset for the next event
429 //_______________________________________________________________________________
430 void AliMUONv1::StepManager2()
432 /// Step manager for the chambers
434 // Only charged tracks
435 if( !(gMC->TrackCharge()) ) return;
436 // Only charged tracks
438 // Only gas gap inside chamber
439 // Tag chambers and record hits when track enters
440 static Int_t idvol=-1, iEnter = 0;
444 const Float_t kBig = 1.e10;
445 static Double_t xyzEnter[3];
448 // Only gas gap inside chamber
449 // Tag chambers and record hits when track enters
450 id=gMC->CurrentVolID(copy);
451 iChamber = GetChamberId(id);
454 if (idvol == -1) return;
456 // Filling TrackRefs file for MUON. Our Track references are the active volume of the chambers
457 if ( (gMC->IsTrackEntering() || gMC->IsTrackExiting() ) )
458 AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber());
460 if( gMC->IsTrackEntering() ) {
461 Float_t theta = fTrackMomentum.Theta();
462 if ((TMath::Pi()-theta)*kRaddeg>=15.) gMC->SetMaxStep(fStepMaxInActiveGas); // We use Pi-theta because z is negative
464 gMC->TrackPosition(xyzEnter[0], xyzEnter[1], xyzEnter[2]); // save coordinates of entrance point
468 // Form("Active volume found %d chamber %d Z chamber is %f ",idvol,iChamber,
469 // ( (AliMUONChamber*)(*fChambers)[idvol])->Z())) ;
470 // Particule id and mass,
471 Int_t ipart = gMC->TrackPid();
472 Float_t mass = gMC->TrackMass();
474 fDestepSum[idvol]+=gMC->Edep();
475 // Get current particle id (ipart), track position (pos) and momentum (mom)
476 if ( fStepSum[idvol]==0.0 ) gMC->TrackMomentum(fTrackMomentum);
477 fStepSum[idvol]+=gMC->TrackStep();
479 // if (AliDebugLevel()) {
480 // AliDebug(1,Form("Step, iChamber %d, Particle %d, theta %f phi %f mass %f StepSum %f eloss %g",
481 // iChamber,ipart, fTrackMomentum.Theta()*kRaddeg, fTrackMomentum.Phi()*kRaddeg,
482 // mass, fStepSum[idvol], gMC->Edep()));
483 // AliDebug(1,Form("Step:Track Momentum %f %f %f", fTrackMomentum.X(), fTrackMomentum.Y(),
484 // fTrackMomentum.Z()));
485 // gMC->TrackPosition(fTrackPosition);
486 // AliDebug(1,Form("Step: Track Position %f %f %f",fTrackPosition.X(),
487 // fTrackPosition.Y(),fTrackPosition.Z())) ;
490 // Track left chamber or StepSum larger than fStepMaxInActiveGas
491 if ( gMC->IsTrackExiting() ||
492 gMC->IsTrackStop() ||
493 gMC->IsTrackDisappeared()||
494 (fStepSum[idvol]>fStepMaxInActiveGas) ) {
496 if ( gMC->IsTrackExiting() ||
497 gMC->IsTrackStop() ||
498 gMC->IsTrackDisappeared() ) gMC->SetMaxStep(kBig);
499 if (fDestepSum[idvol] == 0) {
500 // AZ - no energy release
501 fStepSum[idvol] = 0; // Reset for the next event
506 gMC->TrackPosition(fTrackPosition);
507 Float_t theta = fTrackMomentum.Theta();
508 Float_t phi = fTrackMomentum.Phi();
511 Double_t xyz0[3]={0}, xyz1[3]={0}, tmp[3]={0};
512 if (gMC->IsTrackExiting() && iEnter != 0) {
513 // AZ - this code is to avoid artificial hit splitting at the
514 // "fake" boundary inside the same chamber. It will still produce
515 // 2 hits but with the same coordinates (at the wire) to allow
516 // their merging at the digitization level.
518 // Only for a track going from the entrance to the exit from the volume
519 // Get local coordinates
520 gMC->Gmtod(xyzEnter, xyz0, 1); // local coord. at the entrance
522 fTrackPosition.Vect().GetXYZ(tmp);
523 gMC->Gmtod(tmp, xyz1, 1); // local coord. at the exit
524 Float_t dx = xyz0[0] - xyz1[0];
525 Float_t dy = xyz0[1] - xyz1[1];
526 Float_t thLoc = TMath::ATan2 (TMath::Sqrt(dx*dx+dy*dy), TMath::Abs(xyz0[2]-xyz1[2]));
527 if (thLoc * TMath::RadToDeg() < 15) merge = 1;
532 if (xyz1[2] != xyz0[2]) dz = xyz0[2] / (xyz1[2] - xyz0[2]);
533 tmp[0] = xyz0[0] - (xyz1[0] - xyz0[0]) * dz; // local coord. at the wire
534 tmp[1] = xyz0[1] - (xyz1[1] - xyz0[1]) * dz;
535 tmp[2] = xyz0[2] - (xyz1[2] - xyz0[2]) * dz;
536 gMC->Gdtom(tmp, xyz1, 1); // global coord. at the wire
537 fTrackPosition.SetXYZT(xyz1[0], xyz1[1], xyz1[2], fTrackPosition.T());
539 TLorentzVector backToWire( fStepSum[idvol]/2.*sin(theta)*cos(phi),
540 fStepSum[idvol]/2.*sin(theta)*sin(phi),
541 fStepSum[idvol]/2.*cos(theta),0.0 );
542 fTrackPosition-=backToWire;
543 //printf(" %d %d %d %f %d \n", gMC->IsTrackExiting(), gMC->IsTrackStop(), gMC->IsTrackDisappeared(), fStepSum[idvol], iEnter);
545 // Form("Track Position %f %f %f",fTrackPosition.X(),fTrackPosition.Y(),fTrackPosition.Z()));
547 // Form("Exit: Track backToWire %f %f %f",backToWire.X(),backToWire.Y(),backToWire.Z())) ;
550 //-------------- Angle effect
551 // Ratio between energy loss of particle and Mip as a function of BetaGamma of particle (Energy/Mass)
553 Float_t betaxGamma = fTrackMomentum.P()/mass;// pc/mc2
554 Float_t sigmaEffect10degrees;
555 Float_t sigmaEffectThetadegrees;
556 Float_t eLossParticleELossMip;
557 Float_t yAngleEffect=0.;
558 Float_t thetawires = TMath::Abs( TMath::ASin( TMath::Sin(TMath::Pi()-theta) * TMath::Sin(phi) ) );// We use Pi-theta because z is negative
562 if ( (betaxGamma >3.2) && (thetawires*kRaddeg<=15.) ) {
563 betaxGamma=TMath::Log(betaxGamma);
564 eLossParticleELossMip = fElossRatio->Eval(betaxGamma);
565 // 10 degrees is a reference for a model (arbitrary)
566 sigmaEffect10degrees=fAngleEffect10->Eval(eLossParticleELossMip);// in micrometers
567 // Angle with respect to the wires assuming that chambers are perpendicular to the z axis.
568 sigmaEffectThetadegrees = sigmaEffect10degrees/fAngleEffectNorma->Eval(thetawires*kRaddeg); // For 5mm gap
569 if ( (iChamber==1) || (iChamber==2) )
570 sigmaEffectThetadegrees/=(1.09833e+00+1.70000e-02*(thetawires*kRaddeg)); // The gap is different (4mm)
571 yAngleEffect=1.e-04*gRandom->Gaus(0,sigmaEffectThetadegrees); // Error due to the angle effect in cm
575 // Detection elements ids
576 const AliMUONGeometryModule* kGeometryModule
577 = GetGeometry()->GetModule(iChamber-1);
579 AliMUONGeometryDetElement* detElement
580 = kGeometryModule->FindBySensitiveVolume(CurrentVolumePath());
583 if (detElement) detElemId = detElement->GetUniqueID();
586 cerr << "Chamber id: "
587 << setw(3) << iChamber << " "
589 << CurrentVolumePath()
591 << setw(5) << detElemId
594 gMC->TrackPosition(x, y, z);
595 cerr << " global position: "
596 << x << ", " << y << ", " << z
598 AliError("DetElemId not identified.");
601 // One hit per chamber
602 GetMUONData()->AddHit2(fIshunt,
603 gAlice->GetMCApp()->GetCurrentTrackNumber(),
606 fTrackPosition.Y()+yAngleEffect,
618 // AliDebug(1,Form("Exit: Particle exiting from chamber %d",iChamber));
619 // AliDebug(1,Form("Exit: StepSum %f eloss geant %g ",fStepSum[idvol],fDestepSum[idvol]));
620 // AliDebug(1,Form("Exit: Track Position %f %f %f",fTrackPosition.X(),fTrackPosition.Y(),fTrackPosition.Z()) ;
622 fStepSum[idvol] =0; // Reset for the next event
623 fDestepSum[idvol]=0; // Reset for the next event