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 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
23 //-----------------------------------------------------------------------------
25 #include "AliMUONv1.h"
26 #include "AliMUONConstants.h"
27 #include "AliMUONResponseFactory.h"
28 #include "AliMUONHit.h"
29 #include "AliMUONGeometryBuilder.h"
30 #include "AliMUONGeometry.h"
31 #include "AliMUONGeometryTransformer.h"
32 #include "AliMUONGeometryModule.h"
33 #include "AliMUONStringIntMap.h"
34 #include "AliMUONGeometryDetElement.h"
37 #include "AliMpDEManager.h"
43 #include "AliTrackReference.h"
49 #include <TClonesArray.h>
51 #include <TVirtualMC.h>
52 #include <TGeoMatrix.h>
56 #include "AliMUONVHitStore.h"
62 //___________________________________________
63 AliMUONv1::AliMUONv1()
67 fStepMaxInActiveGas(0.6),
74 fAngleEffectNorma(0x0),
75 fMagAngleEffectNorma(0x0)
77 /// Default constructor
79 AliDebug(1,Form("default (empty) ctor this=%p",this));
82 //___________________________________________
83 AliMUONv1::AliMUONv1(const char *name, const char* title)
84 : AliMUON(name, title),
87 fStepMaxInActiveGas(0.6),
94 fAngleEffectNorma(0x0),
95 fMagAngleEffectNorma(0x0)
97 /// Standard onstructor
99 AliDebug(1,Form("ctor this=%p",this));
102 if ( ! AliMpCDB::LoadMpSegmentation() ) {
103 AliFatal("Could not access mapping from OCDB !");
106 // By default include all stations
108 fStepSum = new Float_t [AliMUONConstants::NCh()];
109 fDestepSum = new Float_t [AliMUONConstants::NCh()];
110 for (Int_t i=0; i<AliMUONConstants::NCh(); i++) {
114 // Ratio of particle mean eloss with respect MIP's Khalil Boudjemline, sep 2003, PhD.Thesis and Particle Data Book
115 fElossRatio = new TF1("ElossRatio","[0]+[1]*x+[2]*x*x+[3]*x*x*x+[4]*x*x*x*x",0.5,5.);
116 fElossRatio->SetParameter(0,1.02138);
117 fElossRatio->SetParameter(1,-9.54149e-02);
118 fElossRatio->SetParameter(2,+7.83433e-02);
119 fElossRatio->SetParameter(3,-9.98208e-03);
120 fElossRatio->SetParameter(4,+3.83279e-04);
122 // Angle effect in tracking chambers at theta =10 degres as a function of ElossRatio (Khalil BOUDJEMLINE sep 2003 Ph.D Thesis) (in micrometers)
123 fAngleEffect10 = new TF1("AngleEffect10","[0]+[1]*x+[2]*x*x",0.5,3.0);
124 fAngleEffect10->SetParameter(0, 1.90691e+02);
125 fAngleEffect10->SetParameter(1,-6.62258e+01);
126 fAngleEffect10->SetParameter(2,+1.28247e+01);
127 // Angle effect: Normalisation form theta=10 degres to theta between 0 and 10 (Khalil BOUDJEMLINE sep 2003 Ph.D Thesis)
128 // Angle with respect to the wires assuming that chambers are perpendicular to the z axis.
129 fAngleEffectNorma = new TF1("AngleEffectNorma","[0]+[1]*x+[2]*x*x+[3]*x*x*x",0.0,10.0);
130 fAngleEffectNorma->SetParameter(0,4.148);
131 fAngleEffectNorma->SetParameter(1,-6.809e-01);
132 fAngleEffectNorma->SetParameter(2,5.151e-02);
133 fAngleEffectNorma->SetParameter(3,-1.490e-03);
135 // Magnetic field effect: Normalisation form theta=16 degres (eq. 10 degrees B=0) to theta between -20 and 20 (Lamia Benhabib jun 2006 )
136 // Angle with respect to the wires assuming that chambers are perpendicular to the z axis.
137 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.);
138 fMagAngleEffectNorma->SetParameters(8.6995, 25.4022, 13.8822, 2.4717, 1.1551, -0.0624, 0.0012);
141 //___________________________________________
142 AliMUONv1::~AliMUONv1()
146 AliDebug(1,Form("dtor this=%p",this));
148 delete [] fDestepSum;
150 delete fAngleEffect10;
151 delete fAngleEffectNorma;
152 delete fMagAngleEffectNorma;
155 //__________________________________________________
156 void AliMUONv1::CreateGeometry()
158 /// Construct geometry using geometry builder
160 fGeometryBuilder->CreateGeometry();
163 //________________________________________________________________
164 void AliMUONv1::CreateMaterials()
166 /// Construct materials using geometry builder
168 fGeometryBuilder->CreateMaterials();
171 //________________________________________________________________
172 void AliMUONv1::AddAlignableVolumes() const
174 /// Construct materials using geometry builder
176 GetGeometryTransformer()->AddAlignableVolumes();
180 //___________________________________________
181 void AliMUONv1::Init()
183 /// Initialize geometry
185 AliDebug(1,"Start Init for version 1 - CPC chamber type");
187 fGeometryBuilder->InitGeometry();
188 AliDebug(1,"Finished Init for version 1 - CPC chamber type");
191 // Build segmentation
192 // using geometry parametrisation
196 AliMUONResponseFactory respFactory("default", fIsTailEffect);
197 respFactory.Build(this);
201 //__________________________________________________________________
202 Int_t AliMUONv1::GetGeomModuleId(Int_t volId) const
204 /// Check if the volume with specified volId is a sensitive volume (gas)
205 /// of some chamber and return the chamber number;
206 /// if not sensitive volume - return 0.
208 for (Int_t i = 0; i < AliMUONConstants::NGeomModules(); i++) {
209 if ( GetGeometry()->GetModule(i)->IsSensitiveVolume(volId) )
216 //_______________________________________________________________________________
217 TString AliMUONv1::CurrentVolumePath() const
219 /// Return current volume path
220 /// (Could be removed when this function is available via gMC)
227 name = gMC->CurrentVolOffName(imother);
228 gMC->CurrentVolOffID(imother++, copyNo);
235 while ( name != TString("ALIC") );
240 //_______________________________________________________________________________
241 void AliMUONv1::StepManager()
243 /// Step manager for the chambers
245 // Only charged tracks
246 if( !(gMC->TrackCharge()) ) return;
247 // Only charged tracks
249 // Only gas gap inside chamber
250 // Tag chambers and record hits when track enters
251 static Int_t idvol=-1, iEnter = 0;
253 const Float_t kBig = 1.e10;
254 static Double_t xyzEnter[3];
257 // Only gas gap inside chamber
258 // Tag chambers and record hits when track enters
259 Int_t id=gMC->CurrentVolID(copy);
260 Int_t iGeomModule = GetGeomModuleId(id);
261 if (iGeomModule == -1) return;
263 // Detection elements id
264 const AliMUONGeometryModule* kGeometryModule
265 = GetGeometry()->GetModule(iGeomModule);
266 AliMUONGeometryDetElement* detElement
267 = kGeometryModule->FindBySensitiveVolume(CurrentVolumePath());
269 if (!detElement && iGeomModule < AliMUONConstants::NGeomModules()-2) {
271 const AliMUONGeometryModule* kGeometryModule2
272 = GetGeometry()->GetModule(iGeomModule);
274 = kGeometryModule2->FindBySensitiveVolume(CurrentVolumePath());
278 if (detElement) detElemId = detElement->GetUniqueID();
282 << "Geometry module id: "
283 << setw(3) << iGeomModule << " "
285 << CurrentVolumePath()
287 << setw(5) << detElemId
290 gMC->TrackPosition(x, y, z);
292 << " global position: "
293 << x << ", " << y << ", " << z
295 AliErrorStream() << "DetElemId not identified." << endl;
298 Int_t iChamber = AliMpDEManager::GetChamberId(detElemId) + 1;
301 // Filling TrackRefs file for MUON. Our Track references are the active volume of the chambers
302 if ( (gMC->IsTrackEntering() || gMC->IsTrackExiting() ) ) {
303 AliTrackReference* trackReference
304 = AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber(), AliTrackReference::kMUON);
305 trackReference->SetUserId(detElemId);
308 if( gMC->IsTrackEntering() ) {
309 Float_t theta = fTrackMomentum.Theta();
310 if ((TMath::Pi()-theta)*kRaddeg>=15.) gMC->SetMaxStep(fStepMaxInActiveGas); // We use Pi-theta because z is negative
312 gMC->TrackPosition(xyzEnter[0], xyzEnter[1], xyzEnter[2]); // save coordinates of entrance point
316 // Form("Active volume found %d chamber %d Z chamber is %f ",idvol,iChamber,
317 // ( (AliMUONChamber*)(*fChambers)[idvol])->Z())) ;
318 // Particule id and mass,
319 Int_t ipart = gMC->TrackPid();
320 Float_t mass = gMC->TrackMass();
322 fDestepSum[idvol]+=gMC->Edep();
323 // Get current particle id (ipart), track position (pos) and momentum (mom)
324 if ( fStepSum[idvol]==0.0 ) gMC->TrackMomentum(fTrackMomentum);
325 fStepSum[idvol]+=gMC->TrackStep();
327 // if (AliDebugLevel()) {
328 // AliDebug(1,Form("Step, iChamber %d, Particle %d, theta %f phi %f mass %f StepSum %f eloss %g",
329 // iChamber,ipart, fTrackMomentum.Theta()*kRaddeg, fTrackMomentum.Phi()*kRaddeg,
330 // mass, fStepSum[idvol], gMC->Edep()));
331 // AliDebug(1,Form("Step:Track Momentum %f %f %f", fTrackMomentum.X(), fTrackMomentum.Y(),
332 // fTrackMomentum.Z()));
333 // gMC->TrackPosition(fTrackPosition);
334 // AliDebug(1,Form("Step: Track Position %f %f %f",fTrackPosition.X(),
335 // fTrackPosition.Y(),fTrackPosition.Z())) ;
338 // Track left chamber or StepSum larger than fStepMaxInActiveGas
339 if ( gMC->IsTrackExiting() ||
340 gMC->IsTrackStop() ||
341 gMC->IsTrackDisappeared()||
342 (fStepSum[idvol]>fStepMaxInActiveGas) ) {
344 if ( gMC->IsTrackExiting() ||
345 gMC->IsTrackStop() ||
346 gMC->IsTrackDisappeared() ) gMC->SetMaxStep(kBig);
347 if (fDestepSum[idvol] == 0) {
348 // AZ - no energy release
349 fStepSum[idvol] = 0; // Reset for the next event
354 gMC->TrackPosition(fTrackPosition);
355 Float_t theta = fTrackMomentum.Theta();
356 Float_t phi = fTrackMomentum.Phi();
359 Double_t xyz0[3]={0}, xyz1[3]={0}, tmp[3]={0};
360 if (gMC->IsTrackExiting() && iEnter != 0) {
361 // AZ - this code is to avoid artificial hit splitting at the
362 // "fake" boundary inside the same chamber. It will still produce
363 // 2 hits but with the same coordinates (at the wire) to allow
364 // their merging at the digitization level.
366 // Only for a track going from the entrance to the exit from the volume
367 // Get local coordinates
368 gMC->Gmtod(xyzEnter, xyz0, 1); // local coord. at the entrance
370 fTrackPosition.Vect().GetXYZ(tmp);
371 gMC->Gmtod(tmp, xyz1, 1); // local coord. at the exit
372 Float_t dx = xyz0[0] - xyz1[0];
373 Float_t dy = xyz0[1] - xyz1[1];
374 Float_t thLoc = TMath::ATan2 (TMath::Sqrt(dx*dx+dy*dy), TMath::Abs(xyz0[2]-xyz1[2]));
375 if (thLoc * TMath::RadToDeg() < 15) merge = 1;
380 if (xyz1[2] != xyz0[2]) dz = xyz0[2] / (xyz1[2] - xyz0[2]);
381 tmp[0] = xyz0[0] - (xyz1[0] - xyz0[0]) * dz; // local coord. at the wire
382 tmp[1] = xyz0[1] - (xyz1[1] - xyz0[1]) * dz;
383 tmp[2] = xyz0[2] - (xyz1[2] - xyz0[2]) * dz;
384 gMC->Gdtom(tmp, xyz1, 1); // global coord. at the wire
385 fTrackPosition.SetXYZT(xyz1[0], xyz1[1], xyz1[2], fTrackPosition.T());
387 TLorentzVector backToWire( fStepSum[idvol]/2.*sin(theta)*cos(phi),
388 fStepSum[idvol]/2.*sin(theta)*sin(phi),
389 fStepSum[idvol]/2.*cos(theta),0.0 );
390 fTrackPosition-=backToWire;
391 //printf(" %d %d %d %f %d \n", gMC->IsTrackExiting(), gMC->IsTrackStop(), gMC->IsTrackDisappeared(), fStepSum[idvol], iEnter);
393 // Form("Track Position %f %f %f",fTrackPosition.X(),fTrackPosition.Y(),fTrackPosition.Z()));
395 // Form("Exit: Track backToWire %f %f %f",backToWire.X(),backToWire.Y(),backToWire.Z())) ;
398 //-------------- Angle effect
399 // Ratio between energy loss of particle and Mip as a function of BetaGamma of particle (Energy/Mass)
401 Float_t betaxGamma = fTrackMomentum.P()/mass;// pc/mc2
402 Float_t sigmaEffect10degrees;
403 Float_t sigmaEffectThetadegrees;
404 Float_t eLossParticleELossMip;
405 Float_t yAngleEffect=0.;
406 Float_t thetawires = TMath::ASin( TMath::Sin(TMath::Pi()-theta) * TMath::Sin(phi) ) ;// We use Pi-theta because z is negative
407 Double_t bField[3] = {0};
408 fTrackPosition.Vect().GetXYZ(tmp);
409 gAlice->Field(tmp,bField);
411 if (fAngleEffect && !fMagEffect){
412 thetawires = TMath::Abs(thetawires);
413 if ( (betaxGamma >3.2) && (thetawires*kRaddeg<=15.) ) {
414 betaxGamma=TMath::Log(betaxGamma);
415 eLossParticleELossMip = fElossRatio->Eval(betaxGamma);
416 // 10 degrees is a reference for a model (arbitrary)
417 sigmaEffect10degrees=fAngleEffect10->Eval(eLossParticleELossMip);// in micrometers
418 // Angle with respect to the wires assuming that chambers are perpendicular to the z axis.
419 sigmaEffectThetadegrees = sigmaEffect10degrees/fAngleEffectNorma->Eval(thetawires*kRaddeg); // For 5mm gap
420 if ( (iChamber==1) || (iChamber==2) )
421 sigmaEffectThetadegrees/=(1.09833e+00+1.70000e-02*(thetawires*kRaddeg)); // The gap is different (4mm)
422 yAngleEffect=1.e-04*gRandom->Gaus(0,sigmaEffectThetadegrees); // Error due to the angle effect in cm
425 else if (fAngleEffect && fMagEffect) {
426 if ( (betaxGamma >3.2) && (TMath::Abs(thetawires*kRaddeg)<=15.) ) {
427 betaxGamma=TMath::Log(betaxGamma);
428 eLossParticleELossMip = fElossRatio->Eval(betaxGamma);
429 // 10 degrees is a reference for a model (arbitrary)
430 sigmaEffect10degrees=fAngleEffect10->Eval(eLossParticleELossMip);// in micrometers
431 // Angle with respect to the wires assuming that chambers are perpendicular to the z axis.
432 sigmaEffectThetadegrees = sigmaEffect10degrees/fMagAngleEffectNorma->Eval(thetawires*kRaddeg,bField[0]/10.); // For 5mm gap
433 if ( (iChamber==1) || (iChamber==2) )
434 sigmaEffectThetadegrees/=(1.09833e+00+1.70000e-02*(thetawires*kRaddeg)); // The gap is different (4mm)
435 yAngleEffect=1.e-04*gRandom->Gaus(0,sigmaEffectThetadegrees); // Error due to the angle effect in cm
439 AliMUONHit hit(fIshunt,
440 gAlice->GetMCApp()->GetCurrentTrackNumber(),
443 fTrackPosition.Y()+yAngleEffect,
457 fStepSum[idvol] =0; // Reset for the next event
458 fDestepSum[idvol]=0; // Reset for the next event