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 /////////////////////////////////////////////////////////
19 // Manager and hits classes for set:MUON version 1 //
20 /////////////////////////////////////////////////////////
24 #include <TClonesArray.h>
26 #include <TVirtualMC.h>
27 #include <TGeoMatrix.h>
29 #include "AliMUONv1.h"
31 #include "AliMUONChamber.h"
32 #include "AliMUONConstants.h"
33 #include "AliMUONFactoryV3.h"
34 #include "AliMUONFactoryV2.h"
35 #include "AliMUONHit.h"
36 #include "AliMUONTriggerCircuit.h"
37 #include "AliMUONGeometryBuilder.h"
38 #include "AliMUONGeometryModule.h"
39 #include "AliMUONGeometrySVMap.h"
40 #include "AliMUONGeometryDetElement.h"
50 //___________________________________________
51 AliMUONv1::AliMUONv1()
53 fStepManagerVersionOld(kTRUE),
54 fStepManagerVersionDE(kTRUE),
56 fStepMaxInActiveGas(0.6),
63 fAngleEffectNorma(0x0),
66 // Default constructor
67 AliDebug(1,Form("default (empty) ctor this=%p",this));
70 //___________________________________________
71 AliMUONv1::AliMUONv1(const char *name, const char *title)
72 : AliMUON(name,title),
73 fStepManagerVersionOld(kTRUE),
74 fStepManagerVersionDE(kTRUE),
76 fStepMaxInActiveGas(0.6),
83 fAngleEffectNorma(0x0),
86 // Standard onstructor
88 AliDebug(1,Form("ctor this=%p",this));
90 // By default include all stations
92 fStepSum = new Float_t [AliMUONConstants::NCh()];
93 fDestepSum = new Float_t [AliMUONConstants::NCh()];
94 for (Int_t i=0; i<AliMUONConstants::NCh(); i++) {
98 // Ratio of particle mean eloss with respect MIP's Khalil Boudjemline, sep 2003, PhD.Thesis and Particle Data Book
99 fElossRatio = new TF1("ElossRatio","[0]+[1]*x+[2]*x*x+[3]*x*x*x+[4]*x*x*x*x",0.5,5.);
100 fElossRatio->SetParameter(0,1.02138);
101 fElossRatio->SetParameter(1,-9.54149e-02);
102 fElossRatio->SetParameter(2,+7.83433e-02);
103 fElossRatio->SetParameter(3,-9.98208e-03);
104 fElossRatio->SetParameter(4,+3.83279e-04);
106 // Angle effect in tracking chambers at theta =10 degres as a function of ElossRatio (Khalil BOUDJEMLINE sep 2003 Ph.D Thesis) (in micrometers)
107 fAngleEffect10 = new TF1("AngleEffect10","[0]+[1]*x+[2]*x*x",0.5,3.0);
108 fAngleEffect10->SetParameter(0, 1.90691e+02);
109 fAngleEffect10->SetParameter(1,-6.62258e+01);
110 fAngleEffect10->SetParameter(2,+1.28247e+01);
111 // Angle effect: Normalisation form theta=10 degres to theta between 0 and 10 (Khalil BOUDJEMLINE sep 2003 Ph.D Thesis)
112 // Angle with respect to the wires assuming that chambers are perpendicular to the z axis.
113 fAngleEffectNorma = new TF1("AngleEffectNorma","[0]+[1]*x+[2]*x*x+[3]*x*x*x",0.0,10.0);
114 fAngleEffectNorma->SetParameter(0,4.148);
115 fAngleEffectNorma->SetParameter(1,-6.809e-01);
116 fAngleEffectNorma->SetParameter(2,5.151e-02);
117 fAngleEffectNorma->SetParameter(3,-1.490e-03);
120 //_____________________________________________________________________________
121 AliMUONv1::AliMUONv1(const AliMUONv1& right)
124 // copy constructor (not implemented)
126 AliFatal("Copy constructor not provided.");
129 //___________________________________________
130 AliMUONv1::~AliMUONv1()
133 AliDebug(1,Form("dtor this=%p",this));
135 delete [] fDestepSum;
137 delete fAngleEffect10;
138 delete fAngleEffectNorma;
142 //_____________________________________________________________________________
143 AliMUONv1& AliMUONv1::operator=(const AliMUONv1& right)
145 // assignement operator (not implemented)
147 // check assignement to self
148 if (this == &right) return *this;
150 AliFatal("Assignement operator not provided.");
155 //__________________________________________________
156 void AliMUONv1::CreateGeometry()
159 // Construct geometry using geometry builder
162 fGeometryBuilder->CreateGeometry();
165 //________________________________________________________________
166 void AliMUONv1::CreateMaterials()
169 // Construct materials using geometry builder
172 fGeometryBuilder->CreateMaterials();
175 //___________________________________________
176 void AliMUONv1::Init()
178 AliDebug(1,"Start Init for version 1 - CPC chamber type");
182 // Initialize geometry
184 fGeometryBuilder->InitGeometry();
185 AliDebug(1,"Finished Init for version 1 - CPC chamber type");
187 std::string ftype(GetTitle());
189 if ( ftype == "default" || ftype == "AliMUONFactoryV2")
191 fFactory = new AliMUONFactoryV2("New MUON Factory");
192 (static_cast<AliMUONFactoryV2*>(fFactory))->Build(this,"default");
194 else if ( ftype == "AliMUONFactoryV3" )
196 fFactory = new AliMUONFactoryV3("New MUON Factory");
197 (static_cast<AliMUONFactoryV3*>(fFactory))->Build(this,"default");
201 AliFatal(Form("Wrong factory type : %s",ftype.c_str()));
205 // Initialize segmentation
208 for (i=0; i<AliMUONConstants::NCh(); i++)
209 ( (AliMUONChamber*) (*fChambers)[i])->Init(2);// new segmentation
214 for (i=0; i<AliMUONConstants::NTriggerCircuit(); i++)
215 ( (AliMUONTriggerCircuit*) (*fTriggerCircuits)[i])->Init(i);
219 //__________________________________________________________________
220 Int_t AliMUONv1::GetChamberId(Int_t volId) const
222 // Check if the volume with specified volId is a sensitive volume (gas)
223 // of some chamber and returns the chamber number;
224 // if not sensitive volume - return 0.
228 for (Int_t i = 1; i <= AliMUONConstants::NCh(); i++)
229 if (volId==((AliMUONChamber*)(*fChambers)[i-1])->GetGid()) return i;
231 for (Int_t i = 1; i <= AliMUONConstants::NCh(); i++)
232 if ( ((AliMUONChamber*)(*fChambers)[i-1])->IsSensId(volId) ) return i;
237 //_______________________________________________________________________________
238 TString AliMUONv1::CurrentVolumePath() const
240 // Returns current volume path
241 // (Could be removed when this function is available via gMC)
249 name = gMC->CurrentVolOffName(imother);
250 gMC->CurrentVolOffID(imother++, copyNo);
257 while ( name != TString("ALIC") );
262 //_______________________________________________________________________________
263 void AliMUONv1::StepManager()
265 // Stepmanager for the chambers
268 if (fStepManagerVersionDE) {
274 // Only charged tracks
275 if( !(gMC->TrackCharge()) ) return;
276 // Only charged tracks
278 // Only gas gap inside chamber
279 // Tag chambers and record hits when track enters
280 static Int_t idvol=-1;
284 const Float_t kBig = 1.e10;
288 // Only gas gap inside chamber
289 // Tag chambers and record hits when track enters
290 id=gMC->CurrentVolID(copy);
291 iChamber = GetChamberId(id);
294 if (idvol == -1) return;
296 // Filling TrackRefs file for MUON. Our Track references are the active volume of the chambers
297 if ( (gMC->IsTrackEntering() || gMC->IsTrackExiting() ) )
298 AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber());
300 if( gMC->IsTrackEntering() ) {
301 Float_t theta = fTrackMomentum.Theta();
302 if ((TMath::Pi()-theta)*kRaddeg>=15.) gMC->SetMaxStep(fStepMaxInActiveGas); // We use Pi-theta because z is negative
306 // Form("Active volume found %d chamber %d Z chamber is %f ",idvol,iChamber,
307 // ( (AliMUONChamber*)(*fChambers)[idvol])->Z()));
308 // Particule id and mass,
309 Int_t ipart = gMC->TrackPid();
310 Float_t mass = gMC->TrackMass();
312 fDestepSum[idvol]+=gMC->Edep();
313 // Get current particle id (ipart), track position (pos) and momentum (mom)
314 if ( fStepSum[idvol]==0.0 ) gMC->TrackMomentum(fTrackMomentum);
315 fStepSum[idvol]+=gMC->TrackStep();
317 // if(AliDebugLevel()) {
319 // Form("iChamber %d, Particle %d, theta %f phi %f mass %f StepSum %f eloss %g",
320 // iChamber,ipart, fTrackMomentum.Theta()*kRaddeg, fTrackMomentum.Phi()*kRaddeg,
321 // mass, fStepSum[idvol], gMC->Edep()));
323 // Form("Track Momentum %f %f %f", fTrackMomentum.X(), fTrackMomentum.Y(),
324 // fTrackMomentum.Z()));
325 // gMC->TrackPosition(fTrackPosition);
327 // Form("Track Position %f %f %f",fTrackPosition.X(),fTrackPosition.Y(),
328 // fTrackPosition.Z())) ;
331 // Track left chamber or StepSum larger than fStepMaxInActiveGas
332 if ( gMC->IsTrackExiting() ||
333 gMC->IsTrackStop() ||
334 gMC->IsTrackDisappeared()||
335 (fStepSum[idvol]>fStepMaxInActiveGas) ) {
337 if ( gMC->IsTrackExiting() ||
338 gMC->IsTrackStop() ||
339 gMC->IsTrackDisappeared() ) gMC->SetMaxStep(kBig);
341 gMC->TrackPosition(fTrackPosition);
342 Float_t theta = fTrackMomentum.Theta();
343 Float_t phi = fTrackMomentum.Phi();
345 TLorentzVector backToWire( fStepSum[idvol]/2.*sin(theta)*cos(phi),
346 fStepSum[idvol]/2.*sin(theta)*sin(phi),
347 fStepSum[idvol]/2.*cos(theta),0.0 );
348 // AliDebug(1,Form("Exit: Track Position %f %f %f",fTrackPosition.X(),
349 // fTrackPosition.Y(),fTrackPosition.Z())) ;
350 // AliDebug(1,Form("Exit: Track backToWire %f %f %f",backToWire.X(),
351 // backToWire.Y(),backToWire.Z()) ;
352 fTrackPosition-=backToWire;
354 //-------------- Angle effect
355 // Ratio between energy loss of particle and Mip as a function of BetaGamma of particle (Energy/Mass)
357 Float_t betaxGamma = fTrackMomentum.P()/mass;// pc/mc2
358 Float_t sigmaEffect10degrees;
359 Float_t sigmaEffectThetadegrees;
360 Float_t eLossParticleELossMip;
361 Float_t yAngleEffect=0.;
362 Float_t thetawires = TMath::Abs( TMath::ASin( TMath::Sin(TMath::Pi()-theta) * TMath::Sin(phi) ) );// We use Pi-theta because z is negative
366 if ( (betaxGamma >3.2) && (thetawires*kRaddeg<=15.) ) {
367 betaxGamma=TMath::Log(betaxGamma);
368 eLossParticleELossMip = fElossRatio->Eval(betaxGamma);
369 // 10 degrees is a reference for a model (arbitrary)
370 sigmaEffect10degrees=fAngleEffect10->Eval(eLossParticleELossMip);// in micrometers
371 // Angle with respect to the wires assuming that chambers are perpendicular to the z axis.
372 sigmaEffectThetadegrees = sigmaEffect10degrees/fAngleEffectNorma->Eval(thetawires*kRaddeg); // For 5mm gap
373 if ( (iChamber==1) || (iChamber==2) )
374 sigmaEffectThetadegrees/=(1.09833e+00+1.70000e-02*(thetawires*kRaddeg)); // The gap is different (4mm)
375 yAngleEffect=1.e-04*gRandom->Gaus(0,sigmaEffectThetadegrees); // Error due to the angle effect in cm
379 // Detection elements ids
380 AliMUONGeometryModule* geometry
381 = Chamber(iChamber-1).GetGeometry();
383 AliMUONGeometryDetElement* detElement
384 = geometry->FindBySensitiveVolume(CurrentVolumePath());
387 if (detElement) detElemId = detElement->GetUniqueID();
390 cerr << "Chamber id: "
391 << setw(3) << iChamber << " "
393 << CurrentVolumePath()
395 << setw(5) << detElemId
398 gMC->TrackPosition(x, y, z);
399 cerr << " global position: "
400 << x << ", " << y << ", " << z
402 AliWarning("DetElemId not identified.");
405 // One hit per chamber
406 GetMUONData()->AddHit(fIshunt,
407 gAlice->GetMCApp()->GetCurrentTrackNumber(),
410 fTrackPosition.Y()+yAngleEffect,
422 // if (AliDebugLevel()){
423 // AliDebug(1,Form("Exit: Particle exiting from chamber %d",iChamber));
424 // AliDebug(1,Form("Exit: StepSum %f eloss geant %g ",fStepSum[idvol],fDestepSum[idvol]));
425 // AliDebug(1,Form("Exit: Track Position %f %f %f",fTrackPosition.X(),fTrackPosition.Y(),fTrackPosition.Z())) ;
427 fStepSum[idvol] =0; // Reset for the next event
428 fDestepSum[idvol]=0; // Reset for the next event
432 //_______________________________________________________________________________
433 void AliMUONv1::StepManager2()
435 // Stepmanager for the chambers
437 // Only charged tracks
438 if( !(gMC->TrackCharge()) ) return;
439 // Only charged tracks
441 // Only gas gap inside chamber
442 // Tag chambers and record hits when track enters
443 static Int_t idvol=-1;
447 const Float_t kBig = 1.e10;
451 // Only gas gap inside chamber
452 // Tag chambers and record hits when track enters
453 id=gMC->CurrentVolID(copy);
454 iChamber = GetChamberId(id);
457 if (idvol == -1) return;
459 // Filling TrackRefs file for MUON. Our Track references are the active volume of the chambers
460 if ( (gMC->IsTrackEntering() || gMC->IsTrackExiting() ) )
461 AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber());
463 if( gMC->IsTrackEntering() ) {
464 Float_t theta = fTrackMomentum.Theta();
465 if ((TMath::Pi()-theta)*kRaddeg>=15.) gMC->SetMaxStep(fStepMaxInActiveGas); // We use Pi-theta because z is negative
469 // Form("Active volume found %d chamber %d Z chamber is %f ",idvol,iChamber,
470 // ( (AliMUONChamber*)(*fChambers)[idvol])->Z())) ;
471 // Particule id and mass,
472 Int_t ipart = gMC->TrackPid();
473 Float_t mass = gMC->TrackMass();
475 fDestepSum[idvol]+=gMC->Edep();
476 // Get current particle id (ipart), track position (pos) and momentum (mom)
477 if ( fStepSum[idvol]==0.0 ) gMC->TrackMomentum(fTrackMomentum);
478 fStepSum[idvol]+=gMC->TrackStep();
480 // if (AliDebugLevel()) {
481 // AliDebug(1,Form("Step, iChamber %d, Particle %d, theta %f phi %f mass %f StepSum %f eloss %g",
482 // iChamber,ipart, fTrackMomentum.Theta()*kRaddeg, fTrackMomentum.Phi()*kRaddeg,
483 // mass, fStepSum[idvol], gMC->Edep()));
484 // AliDebug(1,Form("Step:Track Momentum %f %f %f", fTrackMomentum.X(), fTrackMomentum.Y(),
485 // fTrackMomentum.Z()));
486 // gMC->TrackPosition(fTrackPosition);
487 // AliDebug(1,Form("Step: Track Position %f %f %f",fTrackPosition.X(),
488 // fTrackPosition.Y(),fTrackPosition.Z())) ;
491 // Track left chamber or StepSum larger than fStepMaxInActiveGas
492 if ( gMC->IsTrackExiting() ||
493 gMC->IsTrackStop() ||
494 gMC->IsTrackDisappeared()||
495 (fStepSum[idvol]>fStepMaxInActiveGas) ) {
497 if ( gMC->IsTrackExiting() ||
498 gMC->IsTrackStop() ||
499 gMC->IsTrackDisappeared() ) gMC->SetMaxStep(kBig);
501 gMC->TrackPosition(fTrackPosition);
502 Float_t theta = fTrackMomentum.Theta();
503 Float_t phi = fTrackMomentum.Phi();
505 TLorentzVector backToWire( fStepSum[idvol]/2.*sin(theta)*cos(phi),
506 fStepSum[idvol]/2.*sin(theta)*sin(phi),
507 fStepSum[idvol]/2.*cos(theta),0.0 );
509 // Form("Track Position %f %f %f",fTrackPosition.X(),fTrackPosition.Y(),fTrackPosition.Z()));
511 // Form("Exit: Track backToWire %f %f %f",backToWire.X(),backToWire.Y(),backToWire.Z())) ;
512 fTrackPosition-=backToWire;
514 //-------------- Angle effect
515 // Ratio between energy loss of particle and Mip as a function of BetaGamma of particle (Energy/Mass)
517 Float_t betaxGamma = fTrackMomentum.P()/mass;// pc/mc2
518 Float_t sigmaEffect10degrees;
519 Float_t sigmaEffectThetadegrees;
520 Float_t eLossParticleELossMip;
521 Float_t yAngleEffect=0.;
522 Float_t thetawires = TMath::Abs( TMath::ASin( TMath::Sin(TMath::Pi()-theta) * TMath::Sin(phi) ) );// We use Pi-theta because z is negative
526 if ( (betaxGamma >3.2) && (thetawires*kRaddeg<=15.) ) {
527 betaxGamma=TMath::Log(betaxGamma);
528 eLossParticleELossMip = fElossRatio->Eval(betaxGamma);
529 // 10 degrees is a reference for a model (arbitrary)
530 sigmaEffect10degrees=fAngleEffect10->Eval(eLossParticleELossMip);// in micrometers
531 // Angle with respect to the wires assuming that chambers are perpendicular to the z axis.
532 sigmaEffectThetadegrees = sigmaEffect10degrees/fAngleEffectNorma->Eval(thetawires*kRaddeg); // For 5mm gap
533 if ( (iChamber==1) || (iChamber==2) )
534 sigmaEffectThetadegrees/=(1.09833e+00+1.70000e-02*(thetawires*kRaddeg)); // The gap is different (4mm)
535 yAngleEffect=1.e-04*gRandom->Gaus(0,sigmaEffectThetadegrees); // Error due to the angle effect in cm
539 // Detection elements ids
540 AliMUONGeometryModule* geometry
541 = Chamber(iChamber-1).GetGeometry();
543 AliMUONGeometryDetElement* detElement
544 = geometry->FindBySensitiveVolume(CurrentVolumePath());
547 if (detElement) detElemId = detElement->GetUniqueID();
550 cerr << "Chamber id: "
551 << setw(3) << iChamber << " "
553 << CurrentVolumePath()
555 << setw(5) << detElemId
558 gMC->TrackPosition(x, y, z);
559 cerr << " global position: "
560 << x << ", " << y << ", " << z
562 AliError("DetElemId not identified.");
565 // One hit per chamber
566 GetMUONData()->AddHit2(fIshunt,
567 gAlice->GetMCApp()->GetCurrentTrackNumber(),
570 fTrackPosition.Y()+yAngleEffect,
582 // AliDebug(1,Form("Exit: Particle exiting from chamber %d",iChamber));
583 // AliDebug(1,Form("Exit: StepSum %f eloss geant %g ",fStepSum[idvol],fDestepSum[idvol]));
584 // AliDebug(1,Form("Exit: Track Position %f %f %f",fTrackPosition.X(),fTrackPosition.Y(),fTrackPosition.Z()) ;
586 fStepSum[idvol] =0; // Reset for the next event
587 fDestepSum[idvol]=0; // Reset for the next event