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a9e2aefa 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
d7c4fbc4 3 * SigmaEffect_thetadegrees *
a9e2aefa 4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
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 *
2c799aa2 12 * about the suitability of this software for any purpeateose. It is *
a9e2aefa 13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
15
88cb7938 16/* $Id$ */
a9e2aefa 17
18/////////////////////////////////////////////////////////
acc838fd 19// Manager and hits classes for set:MUON version 1 //
a9e2aefa 20/////////////////////////////////////////////////////////
acc838fd 21
abaf7c9d 22#include <TRandom.h>
23#include <TF1.h>
116cbefd 24#include <TClonesArray.h>
acc838fd 25#include <TRandom.h>
88cb7938 26#include <TVirtualMC.h>
333f7cda 27#include <TGeoMatrix.h>
a9e2aefa 28
30178c30 29#include "AliMUONv1.h"
a9e2aefa 30#include "AliConst.h"
88cb7938 31#include "AliMUONConstants.h"
40afd6cd 32#include "AliMUONSegFactory.h"
b7ef3c96 33#include "AliMUONResponseFactory.h"
34#include "AliMUONSegmentation.h"
a9e2aefa 35#include "AliMUONHit.h"
8c449e83 36#include "AliMUONTriggerCircuit.h"
d4bb94a1 37#include "AliMUONGeometryBuilder.h"
b7ef3c96 38#include "AliMUONGeometry.h"
39#include "AliMUONGeometryTransformer.h"
e118b27e 40#include "AliMUONGeometryModule.h"
333f7cda 41#include "AliMUONGeometrySVMap.h"
e118b27e 42#include "AliMUONGeometryDetElement.h"
88cb7938 43#include "AliMagF.h"
44#include "AliRun.h"
5d12ce38 45#include "AliMC.h"
8c343c7c 46#include "AliLog.h"
a9e2aefa 47
edee5e63 48#include <string>
49
a9e2aefa 50ClassImp(AliMUONv1)
51
52//___________________________________________
30178c30 53AliMUONv1::AliMUONv1()
54 : AliMUON(),
e8e385f7 55 fStepManagerVersionOld(kTRUE),
56 fStepManagerVersionDE(kTRUE),
d4bb94a1 57 fAngleEffect(kTRUE),
58 fStepMaxInActiveGas(0.6),
59 fStepSum(0x0),
60 fDestepSum(0x0),
61 fTrackMomentum(),
62 fTrackPosition(),
63 fElossRatio(0x0),
64 fAngleEffect10(0x0),
b7ef3c96 65 fAngleEffectNorma(0x0)
a9e2aefa 66{
d4bb94a1 67// Default constructor
edee5e63 68 AliDebug(1,Form("default (empty) ctor this=%p",this));
1391e633 69}
d4bb94a1 70
a9e2aefa 71//___________________________________________
b05d84a5 72AliMUONv1::AliMUONv1(const char *name, const char *title,
73 const char* sDigitizerClassName,
74 const char* digitizerClassName)
75: AliMUON(name,title,sDigitizerClassName,digitizerClassName),
e8e385f7 76 fStepManagerVersionOld(kTRUE),
77 fStepManagerVersionDE(kTRUE),
d4bb94a1 78 fAngleEffect(kTRUE),
79 fStepMaxInActiveGas(0.6),
80 fStepSum(0x0),
81 fDestepSum(0x0),
82 fTrackMomentum(),
83 fTrackPosition(),
84 fElossRatio(0x0),
85 fAngleEffect10(0x0),
b7ef3c96 86 fAngleEffectNorma(0x0)
a9e2aefa 87{
d4bb94a1 88// Standard onstructor
89
edee5e63 90 AliDebug(1,Form("ctor this=%p",this));
91
ba030c0e 92 // By default include all stations
c33d9661 93
1391e633 94 fStepSum = new Float_t [AliMUONConstants::NCh()];
95 fDestepSum = new Float_t [AliMUONConstants::NCh()];
96 for (Int_t i=0; i<AliMUONConstants::NCh(); i++) {
97 fStepSum[i] =0.0;
98 fDestepSum[i]=0.0;
99 }
100 // Ratio of particle mean eloss with respect MIP's Khalil Boudjemline, sep 2003, PhD.Thesis and Particle Data Book
101 fElossRatio = new TF1("ElossRatio","[0]+[1]*x+[2]*x*x+[3]*x*x*x+[4]*x*x*x*x",0.5,5.);
102 fElossRatio->SetParameter(0,1.02138);
103 fElossRatio->SetParameter(1,-9.54149e-02);
104 fElossRatio->SetParameter(2,+7.83433e-02);
105 fElossRatio->SetParameter(3,-9.98208e-03);
106 fElossRatio->SetParameter(4,+3.83279e-04);
107
108 // Angle effect in tracking chambers at theta =10 degres as a function of ElossRatio (Khalil BOUDJEMLINE sep 2003 Ph.D Thesis) (in micrometers)
109 fAngleEffect10 = new TF1("AngleEffect10","[0]+[1]*x+[2]*x*x",0.5,3.0);
110 fAngleEffect10->SetParameter(0, 1.90691e+02);
111 fAngleEffect10->SetParameter(1,-6.62258e+01);
112 fAngleEffect10->SetParameter(2,+1.28247e+01);
113 // Angle effect: Normalisation form theta=10 degres to theta between 0 and 10 (Khalil BOUDJEMLINE sep 2003 Ph.D Thesis)
114 // Angle with respect to the wires assuming that chambers are perpendicular to the z axis.
115 fAngleEffectNorma = new TF1("AngleEffectNorma","[0]+[1]*x+[2]*x*x+[3]*x*x*x",0.0,10.0);
116 fAngleEffectNorma->SetParameter(0,4.148);
117 fAngleEffectNorma->SetParameter(1,-6.809e-01);
118 fAngleEffectNorma->SetParameter(2,5.151e-02);
119 fAngleEffectNorma->SetParameter(3,-1.490e-03);
a9e2aefa 120}
121
fb1bf5c0 122//_____________________________________________________________________________
123AliMUONv1::AliMUONv1(const AliMUONv1& right)
124 : AliMUON(right)
125{
126 // copy constructor (not implemented)
127
8c343c7c 128 AliFatal("Copy constructor not provided.");
fb1bf5c0 129}
130
a9e2aefa 131//___________________________________________
acc838fd 132AliMUONv1::~AliMUONv1()
a9e2aefa 133{
acc838fd 134// Destructor
edee5e63 135 AliDebug(1,Form("dtor this=%p",this));
d4bb94a1 136 delete [] fStepSum;
137 delete [] fDestepSum;
138 delete fElossRatio;
139 delete fAngleEffect10;
8109731a 140 delete fAngleEffectNorma;
acc838fd 141}
b17c0c87 142
fb1bf5c0 143//_____________________________________________________________________________
144AliMUONv1& AliMUONv1::operator=(const AliMUONv1& right)
145{
146 // assignement operator (not implemented)
147
148 // check assignement to self
149 if (this == &right) return *this;
150
8c343c7c 151 AliFatal("Assignement operator not provided.");
fb1bf5c0 152
153 return *this;
154}
155
acc838fd 156//__________________________________________________
157void AliMUONv1::CreateGeometry()
158{
b17c0c87 159//
d4bb94a1 160// Construct geometry using geometry builder
a9e2aefa 161//
a9e2aefa 162
d4bb94a1 163 fGeometryBuilder->CreateGeometry();
acc838fd 164}
a9e2aefa 165
acc838fd 166//________________________________________________________________
a9e2aefa 167void AliMUONv1::CreateMaterials()
168{
a9e2aefa 169//
d4bb94a1 170// Construct materials using geometry builder
171//
acc838fd 172
d4bb94a1 173 fGeometryBuilder->CreateMaterials();
a9e2aefa 174}
175
acc838fd 176//___________________________________________
a9e2aefa 177void AliMUONv1::Init()
a713db22 178{
edee5e63 179 AliDebug(1,"Start Init for version 1 - CPC chamber type");
002920d1 180
edee5e63 181 //
182 // Initialize geometry
183 //
184 fGeometryBuilder->InitGeometry();
185 AliDebug(1,"Finished Init for version 1 - CPC chamber type");
b7ef3c96 186
187
edee5e63 188 std::string ftype(GetTitle());
b7ef3c96 189
190 // Build segmentation
191 // using geometry parametrisation
192 //
40afd6cd 193 AliMUONSegFactory segFactory(GetGeometryTransformer());
194 fSegmentation = segFactory.CreateSegmentation(ftype);
195
196 if (!fSegmentation) {
197 AliFatal(Form("Wrong factory type : %s",ftype.c_str()));
198 }
b7ef3c96 199
200 // Build response
edee5e63 201 //
b7ef3c96 202 AliMUONResponseFactory respFactory("default");
203 respFactory.Build(this);
204
205
edee5e63 206 // Initialize segmentation
207 //
b7ef3c96 208 fSegmentation->Init();
209
210 // Initialize trigger circuits
211 //
212 for (Int_t i=0; i<AliMUONConstants::NTriggerCircuit(); i++) {
e1d9a0df 213 AliMUONTriggerCircuit* c = (AliMUONTriggerCircuit*)(fTriggerCircuits->At(i));
214 c->Init(i);
215// c->Print();
216 }
edee5e63 217
a9e2aefa 218}
1391e633 219
d4bb94a1 220//__________________________________________________________________
221Int_t AliMUONv1::GetChamberId(Int_t volId) const
222{
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.
226// ---
227
b7ef3c96 228 for (Int_t i = 0; i < AliMUONConstants::NCh(); i++) {
229 if ( GetGeometry()->GetModule(i)->IsSensitiveVolume(volId) )
230 return i+1;
231 }
d4bb94a1 232
233 return 0;
234}
333f7cda 235
236//_______________________________________________________________________________
237TString AliMUONv1::CurrentVolumePath() const
238{
239// Returns current volume path
240// (Could be removed when this function is available via gMC)
241// ---
242
243 TString path = "";
244 TString name;
245 Int_t copyNo;
246 Int_t imother = 0;
247 do {
248 name = gMC->CurrentVolOffName(imother);
249 gMC->CurrentVolOffID(imother++, copyNo);
250 TString add = "/";
251 add += name;
252 add += ".";
253 add += copyNo;
254 path.Insert(0,add);
255 }
256 while ( name != TString("ALIC") );
257
258 return path;
259}
260
1391e633 261//_______________________________________________________________________________
c33d9661 262void AliMUONv1::StepManager()
263{
d7c4fbc4 264 // Stepmanager for the chambers
d59b2ec3 265 // TBR
266
267 if (fStepManagerVersionDE) {
268 StepManager2();
269 return;
270 }
d7c4fbc4 271
c33d9661 272
273 // Only charged tracks
d59b2ec3 274 if( !(gMC->TrackCharge()) ) return;
1391e633 275 // Only charged tracks
276
c33d9661 277 // Only gas gap inside chamber
278 // Tag chambers and record hits when track enters
acc838fd 279 static Int_t idvol=-1;
1391e633 280 Int_t iChamber=0;
281 Int_t id=0;
282 Int_t copy;
283 const Float_t kBig = 1.e10;
284
acc838fd 285
286 //
287 // Only gas gap inside chamber
288 // Tag chambers and record hits when track enters
c33d9661 289 id=gMC->CurrentVolID(copy);
acc838fd 290 iChamber = GetChamberId(id);
291 idvol = iChamber -1;
292
293 if (idvol == -1) return;
abaf7c9d 294
967a2a25 295 // Filling TrackRefs file for MUON. Our Track references are the active volume of the chambers
296 if ( (gMC->IsTrackEntering() || gMC->IsTrackExiting() ) )
297 AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber());
298
1391e633 299 if( gMC->IsTrackEntering() ) {
300 Float_t theta = fTrackMomentum.Theta();
4ac9d21e 301 if ((TMath::Pi()-theta)*kRaddeg>=15.) gMC->SetMaxStep(fStepMaxInActiveGas); // We use Pi-theta because z is negative
302 }
abaf7c9d 303
5a0e88a7 304 // AliDebug(1,
305 // Form("Active volume found %d chamber %d Z chamber is %f ",idvol,iChamber,
306 // ( (AliMUONChamber*)(*fChambers)[idvol])->Z()));
307 // Particule id and mass,
1391e633 308 Int_t ipart = gMC->TrackPid();
309 Float_t mass = gMC->TrackMass();
310
311 fDestepSum[idvol]+=gMC->Edep();
312 // Get current particle id (ipart), track position (pos) and momentum (mom)
313 if ( fStepSum[idvol]==0.0 ) gMC->TrackMomentum(fTrackMomentum);
314 fStepSum[idvol]+=gMC->TrackStep();
abaf7c9d 315
5a0e88a7 316 // if(AliDebugLevel()) {
317 // AliDebug(1,
318 // Form("iChamber %d, Particle %d, theta %f phi %f mass %f StepSum %f eloss %g",
319 // iChamber,ipart, fTrackMomentum.Theta()*kRaddeg, fTrackMomentum.Phi()*kRaddeg,
320 // mass, fStepSum[idvol], gMC->Edep()));
321 // AliDebug(1,
322 // Form("Track Momentum %f %f %f", fTrackMomentum.X(), fTrackMomentum.Y(),
323 // fTrackMomentum.Z()));
324 // gMC->TrackPosition(fTrackPosition);
325 // AliDebug(1,
326 // Form("Track Position %f %f %f",fTrackPosition.X(),fTrackPosition.Y(),
327 // fTrackPosition.Z())) ;
328 // }
1391e633 329
330 // Track left chamber or StepSum larger than fStepMaxInActiveGas
331 if ( gMC->IsTrackExiting() ||
332 gMC->IsTrackStop() ||
333 gMC->IsTrackDisappeared()||
334 (fStepSum[idvol]>fStepMaxInActiveGas) ) {
335
336 if ( gMC->IsTrackExiting() ||
acc838fd 337 gMC->IsTrackStop() ||
338 gMC->IsTrackDisappeared() ) gMC->SetMaxStep(kBig);
1391e633 339
340 gMC->TrackPosition(fTrackPosition);
341 Float_t theta = fTrackMomentum.Theta();
342 Float_t phi = fTrackMomentum.Phi();
343
d7c4fbc4 344 TLorentzVector backToWire( fStepSum[idvol]/2.*sin(theta)*cos(phi),
acc838fd 345 fStepSum[idvol]/2.*sin(theta)*sin(phi),
346 fStepSum[idvol]/2.*cos(theta),0.0 );
5a0e88a7 347 // AliDebug(1,Form("Exit: Track Position %f %f %f",fTrackPosition.X(),
348 // fTrackPosition.Y(),fTrackPosition.Z())) ;
349 // AliDebug(1,Form("Exit: Track backToWire %f %f %f",backToWire.X(),
350 // backToWire.Y(),backToWire.Z()) ;
d7c4fbc4 351 fTrackPosition-=backToWire;
1391e633 352
353 //-------------- Angle effect
354 // Ratio between energy loss of particle and Mip as a function of BetaGamma of particle (Energy/Mass)
355
30178c30 356 Float_t betaxGamma = fTrackMomentum.P()/mass;// pc/mc2
d7c4fbc4 357 Float_t sigmaEffect10degrees;
358 Float_t sigmaEffectThetadegrees;
359 Float_t eLossParticleELossMip;
360 Float_t yAngleEffect=0.;
361 Float_t thetawires = TMath::Abs( TMath::ASin( TMath::Sin(TMath::Pi()-theta) * TMath::Sin(phi) ) );// We use Pi-theta because z is negative
362
374ebd7d 363
364 if (fAngleEffect){
30178c30 365 if ( (betaxGamma >3.2) && (thetawires*kRaddeg<=15.) ) {
366 betaxGamma=TMath::Log(betaxGamma);
367 eLossParticleELossMip = fElossRatio->Eval(betaxGamma);
1391e633 368 // 10 degrees is a reference for a model (arbitrary)
d7c4fbc4 369 sigmaEffect10degrees=fAngleEffect10->Eval(eLossParticleELossMip);// in micrometers
1391e633 370 // Angle with respect to the wires assuming that chambers are perpendicular to the z axis.
d7c4fbc4 371 sigmaEffectThetadegrees = sigmaEffect10degrees/fAngleEffectNorma->Eval(thetawires*kRaddeg); // For 5mm gap
1391e633 372 if ( (iChamber==1) || (iChamber==2) )
acc838fd 373 sigmaEffectThetadegrees/=(1.09833e+00+1.70000e-02*(thetawires*kRaddeg)); // The gap is different (4mm)
d7c4fbc4 374 yAngleEffect=1.e-04*gRandom->Gaus(0,sigmaEffectThetadegrees); // Error due to the angle effect in cm
1391e633 375 }
374ebd7d 376 }
1391e633 377
333f7cda 378 // Detection elements ids
b7ef3c96 379 const AliMUONGeometryModule* kGeometryModule
380 = GetGeometry()->GetModule(iChamber-1);
e118b27e 381
382 AliMUONGeometryDetElement* detElement
b7ef3c96 383 = kGeometryModule->FindBySensitiveVolume(CurrentVolumePath());
e118b27e 384
333f7cda 385 Int_t detElemId = 0;
e118b27e 386 if (detElement) detElemId = detElement->GetUniqueID();
333f7cda 387
388 if (!detElemId) {
389 cerr << "Chamber id: "
390 << setw(3) << iChamber << " "
391 << "Current SV: "
392 << CurrentVolumePath()
393 << " detElemId: "
394 << setw(5) << detElemId
395 << endl;
396 Double_t x, y, z;
397 gMC->TrackPosition(x, y, z);
398 cerr << " global position: "
399 << x << ", " << y << ", " << z
400 << endl;
8c343c7c 401 AliWarning("DetElemId not identified.");
333f7cda 402 }
403
1391e633 404 // One hit per chamber
47464038 405 GetMUONData()->AddHit(fIshunt,
406 gAlice->GetMCApp()->GetCurrentTrackNumber(),
407 iChamber, ipart,
408 fTrackPosition.X(),
409 fTrackPosition.Y()+yAngleEffect,
410 fTrackPosition.Z(),
411 gMC->TrackTime(),
412 fTrackMomentum.P(),
413 theta,
414 phi,
415 fStepSum[idvol],
416 fDestepSum[idvol],
417 fTrackPosition.X(),
418 fTrackPosition.Y(),
419 fTrackPosition.Z());
420
5a0e88a7 421// if (AliDebugLevel()){
422// AliDebug(1,Form("Exit: Particle exiting from chamber %d",iChamber));
423// AliDebug(1,Form("Exit: StepSum %f eloss geant %g ",fStepSum[idvol],fDestepSum[idvol]));
424// AliDebug(1,Form("Exit: Track Position %f %f %f",fTrackPosition.X(),fTrackPosition.Y(),fTrackPosition.Z())) ;
1391e633 425// }
426 fStepSum[idvol] =0; // Reset for the next event
427 fDestepSum[idvol]=0; // Reset for the next event
428 }
abaf7c9d 429}
5f91c9e8 430
d59b2ec3 431//_______________________________________________________________________________
432void AliMUONv1::StepManager2()
433{
434 // Stepmanager for the chambers
435
d59b2ec3 436 // Only charged tracks
437 if( !(gMC->TrackCharge()) ) return;
438 // Only charged tracks
439
440 // Only gas gap inside chamber
441 // Tag chambers and record hits when track enters
c5ce4e69 442 static Int_t idvol=-1, iEnter = 0;
d59b2ec3 443 Int_t iChamber=0;
444 Int_t id=0;
445 Int_t copy;
446 const Float_t kBig = 1.e10;
c5ce4e69 447 static Double_t xyzEnter[3];
d59b2ec3 448
449 //
450 // Only gas gap inside chamber
451 // Tag chambers and record hits when track enters
452 id=gMC->CurrentVolID(copy);
453 iChamber = GetChamberId(id);
454 idvol = iChamber -1;
455
456 if (idvol == -1) return;
457
458 // Filling TrackRefs file for MUON. Our Track references are the active volume of the chambers
459 if ( (gMC->IsTrackEntering() || gMC->IsTrackExiting() ) )
460 AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber());
461
462 if( gMC->IsTrackEntering() ) {
463 Float_t theta = fTrackMomentum.Theta();
464 if ((TMath::Pi()-theta)*kRaddeg>=15.) gMC->SetMaxStep(fStepMaxInActiveGas); // We use Pi-theta because z is negative
c5ce4e69 465 iEnter = 1;
466 gMC->TrackPosition(xyzEnter[0], xyzEnter[1], xyzEnter[2]); // save coordinates of entrance point
d59b2ec3 467 }
468
5a0e88a7 469 // AliDebug(1,
470 // Form("Active volume found %d chamber %d Z chamber is %f ",idvol,iChamber,
471 // ( (AliMUONChamber*)(*fChambers)[idvol])->Z())) ;
d59b2ec3 472 // Particule id and mass,
473 Int_t ipart = gMC->TrackPid();
474 Float_t mass = gMC->TrackMass();
475
476 fDestepSum[idvol]+=gMC->Edep();
477 // Get current particle id (ipart), track position (pos) and momentum (mom)
478 if ( fStepSum[idvol]==0.0 ) gMC->TrackMomentum(fTrackMomentum);
479 fStepSum[idvol]+=gMC->TrackStep();
480
5a0e88a7 481 // if (AliDebugLevel()) {
482 // AliDebug(1,Form("Step, iChamber %d, Particle %d, theta %f phi %f mass %f StepSum %f eloss %g",
483 // iChamber,ipart, fTrackMomentum.Theta()*kRaddeg, fTrackMomentum.Phi()*kRaddeg,
484 // mass, fStepSum[idvol], gMC->Edep()));
485 // AliDebug(1,Form("Step:Track Momentum %f %f %f", fTrackMomentum.X(), fTrackMomentum.Y(),
486 // fTrackMomentum.Z()));
487 // gMC->TrackPosition(fTrackPosition);
488 // AliDebug(1,Form("Step: Track Position %f %f %f",fTrackPosition.X(),
489 // fTrackPosition.Y(),fTrackPosition.Z())) ;
490 //}
d59b2ec3 491
492 // Track left chamber or StepSum larger than fStepMaxInActiveGas
493 if ( gMC->IsTrackExiting() ||
494 gMC->IsTrackStop() ||
495 gMC->IsTrackDisappeared()||
496 (fStepSum[idvol]>fStepMaxInActiveGas) ) {
497
498 if ( gMC->IsTrackExiting() ||
499 gMC->IsTrackStop() ||
500 gMC->IsTrackDisappeared() ) gMC->SetMaxStep(kBig);
c5ce4e69 501 if (fDestepSum[idvol] == 0) {
502 // AZ - no energy release
503 fStepSum[idvol] = 0; // Reset for the next event
504 iEnter = 0;
505 return;
506 }
d59b2ec3 507
508 gMC->TrackPosition(fTrackPosition);
509 Float_t theta = fTrackMomentum.Theta();
510 Float_t phi = fTrackMomentum.Phi();
511
c5ce4e69 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.
517
518 // Only for a track going from the entrance to the exit from the volume
519 // Get local coordinates
520 Double_t xyz0[3], xyz1[3], tmp[3];
521 gMC->Gmtod(xyzEnter, xyz0, 1); // local coord. at the entrance
522
523 fTrackPosition.Vect().GetXYZ(tmp);
524 gMC->Gmtod(tmp, xyz1, 1); // local coord. at the exit
525
526 Double_t dz = -0.5;
527 if (xyz1[2] != xyz0[2]) dz = xyz0[2] / (xyz1[2] - xyz0[2]);
528 tmp[0] = xyz0[0] - (xyz1[0] - xyz0[0]) * dz; // local coord. at the wire
529 tmp[1] = xyz0[1] - (xyz1[1] - xyz0[1]) * dz;
530 tmp[2] = xyz0[2] - (xyz1[2] - xyz0[2]) * dz;
531 gMC->Gdtom(tmp, xyz1, 1); // global coord. at the wire
532 fTrackPosition.SetXYZT(xyz1[0], xyz1[1], xyz1[2], fTrackPosition.T());
533 } else {
534 TLorentzVector backToWire( fStepSum[idvol]/2.*sin(theta)*cos(phi),
535 fStepSum[idvol]/2.*sin(theta)*sin(phi),
536 fStepSum[idvol]/2.*cos(theta),0.0 );
537 fTrackPosition-=backToWire;
538 //printf(" %d %d %d %f %d \n", gMC->IsTrackExiting(), gMC->IsTrackStop(), gMC->IsTrackDisappeared(), fStepSum[idvol], iEnter);
539 // AliDebug(1,
540 // Form("Track Position %f %f %f",fTrackPosition.X(),fTrackPosition.Y(),fTrackPosition.Z()));
541 // AliDebug(1,
542 // Form("Exit: Track backToWire %f %f %f",backToWire.X(),backToWire.Y(),backToWire.Z())) ;
543 }
d59b2ec3 544
545 //-------------- Angle effect
546 // Ratio between energy loss of particle and Mip as a function of BetaGamma of particle (Energy/Mass)
547
548 Float_t betaxGamma = fTrackMomentum.P()/mass;// pc/mc2
549 Float_t sigmaEffect10degrees;
550 Float_t sigmaEffectThetadegrees;
551 Float_t eLossParticleELossMip;
552 Float_t yAngleEffect=0.;
553 Float_t thetawires = TMath::Abs( TMath::ASin( TMath::Sin(TMath::Pi()-theta) * TMath::Sin(phi) ) );// We use Pi-theta because z is negative
554
555
556 if (fAngleEffect){
557 if ( (betaxGamma >3.2) && (thetawires*kRaddeg<=15.) ) {
558 betaxGamma=TMath::Log(betaxGamma);
559 eLossParticleELossMip = fElossRatio->Eval(betaxGamma);
560 // 10 degrees is a reference for a model (arbitrary)
561 sigmaEffect10degrees=fAngleEffect10->Eval(eLossParticleELossMip);// in micrometers
562 // Angle with respect to the wires assuming that chambers are perpendicular to the z axis.
563 sigmaEffectThetadegrees = sigmaEffect10degrees/fAngleEffectNorma->Eval(thetawires*kRaddeg); // For 5mm gap
564 if ( (iChamber==1) || (iChamber==2) )
565 sigmaEffectThetadegrees/=(1.09833e+00+1.70000e-02*(thetawires*kRaddeg)); // The gap is different (4mm)
566 yAngleEffect=1.e-04*gRandom->Gaus(0,sigmaEffectThetadegrees); // Error due to the angle effect in cm
567 }
568 }
569
570 // Detection elements ids
b7ef3c96 571 const AliMUONGeometryModule* kGeometryModule
572 = GetGeometry()->GetModule(iChamber-1);
d59b2ec3 573
574 AliMUONGeometryDetElement* detElement
b7ef3c96 575 = kGeometryModule->FindBySensitiveVolume(CurrentVolumePath());
d59b2ec3 576
577 Int_t detElemId = 0;
578 if (detElement) detElemId = detElement->GetUniqueID();
579
580 if (!detElemId) {
581 cerr << "Chamber id: "
582 << setw(3) << iChamber << " "
583 << "Current SV: "
584 << CurrentVolumePath()
585 << " detElemId: "
586 << setw(5) << detElemId
587 << endl;
588 Double_t x, y, z;
589 gMC->TrackPosition(x, y, z);
590 cerr << " global position: "
591 << x << ", " << y << ", " << z
592 << endl;
593 AliError("DetElemId not identified.");
594 }
595
596 // One hit per chamber
8690a0a6 597 GetMUONData()->AddHit2(fIshunt,
d59b2ec3 598 gAlice->GetMCApp()->GetCurrentTrackNumber(),
599 detElemId, ipart,
600 fTrackPosition.X(),
601 fTrackPosition.Y()+yAngleEffect,
602 fTrackPosition.Z(),
603 gMC->TrackTime(),
604 fTrackMomentum.P(),
605 theta,
606 phi,
607 fStepSum[idvol],
608 fDestepSum[idvol],
609 fTrackPosition.X(),
610 fTrackPosition.Y(),
611 fTrackPosition.Z());
612
5a0e88a7 613 // AliDebug(1,Form("Exit: Particle exiting from chamber %d",iChamber));
614 // AliDebug(1,Form("Exit: StepSum %f eloss geant %g ",fStepSum[idvol],fDestepSum[idvol]));
615 // AliDebug(1,Form("Exit: Track Position %f %f %f",fTrackPosition.X(),fTrackPosition.Y(),fTrackPosition.Z()) ;
616
d59b2ec3 617 fStepSum[idvol] =0; // Reset for the next event
618 fDestepSum[idvol]=0; // Reset for the next event
c5ce4e69 619 iEnter = 0;
d59b2ec3 620 }
621}