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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
d19b6003 18// --------------------
19// Class AliMUONv1
20// --------------------
21// AliDetector class for MUON subsystem which implements
22// functions for simulation
acc838fd 23
30178c30 24#include "AliMUONv1.h"
88cb7938 25#include "AliMUONConstants.h"
40afd6cd 26#include "AliMUONSegFactory.h"
b7ef3c96 27#include "AliMUONResponseFactory.h"
28#include "AliMUONSegmentation.h"
a9e2aefa 29#include "AliMUONHit.h"
8c449e83 30#include "AliMUONTriggerCircuit.h"
d4bb94a1 31#include "AliMUONGeometryBuilder.h"
b7ef3c96 32#include "AliMUONGeometry.h"
33#include "AliMUONGeometryTransformer.h"
e118b27e 34#include "AliMUONGeometryModule.h"
7ecf374b 35#include "AliMUONStringIntMap.h"
e118b27e 36#include "AliMUONGeometryDetElement.h"
7ecf374b 37
38#include "AliConst.h"
88cb7938 39#include "AliMagF.h"
40#include "AliRun.h"
5d12ce38 41#include "AliMC.h"
8c343c7c 42#include "AliLog.h"
a9e2aefa 43
7ecf374b 44#include <TRandom.h>
45#include <TF1.h>
46#include <TClonesArray.h>
47#include <TRandom.h>
48#include <TVirtualMC.h>
49#include <TGeoMatrix.h>
50
edee5e63 51#include <string>
52
a9e2aefa 53ClassImp(AliMUONv1)
54
55//___________________________________________
30178c30 56AliMUONv1::AliMUONv1()
57 : AliMUON(),
e8e385f7 58 fStepManagerVersionOld(kTRUE),
59 fStepManagerVersionDE(kTRUE),
d4bb94a1 60 fAngleEffect(kTRUE),
61 fStepMaxInActiveGas(0.6),
62 fStepSum(0x0),
63 fDestepSum(0x0),
64 fTrackMomentum(),
65 fTrackPosition(),
66 fElossRatio(0x0),
67 fAngleEffect10(0x0),
b7ef3c96 68 fAngleEffectNorma(0x0)
a9e2aefa 69{
d19b6003 70/// Default constructor
71
72 AliDebug(1,Form("default (empty) ctor this=%p",this));
1391e633 73}
d4bb94a1 74
a9e2aefa 75//___________________________________________
b05d84a5 76AliMUONv1::AliMUONv1(const char *name, const char *title,
77 const char* sDigitizerClassName,
78 const char* digitizerClassName)
79: AliMUON(name,title,sDigitizerClassName,digitizerClassName),
e8e385f7 80 fStepManagerVersionOld(kTRUE),
81 fStepManagerVersionDE(kTRUE),
d4bb94a1 82 fAngleEffect(kTRUE),
83 fStepMaxInActiveGas(0.6),
84 fStepSum(0x0),
85 fDestepSum(0x0),
86 fTrackMomentum(),
87 fTrackPosition(),
88 fElossRatio(0x0),
89 fAngleEffect10(0x0),
b7ef3c96 90 fAngleEffectNorma(0x0)
a9e2aefa 91{
d19b6003 92/// Standard onstructor
d4bb94a1 93
d19b6003 94 AliDebug(1,Form("ctor this=%p",this));
edee5e63 95
ba030c0e 96 // By default include all stations
c33d9661 97
1391e633 98 fStepSum = new Float_t [AliMUONConstants::NCh()];
99 fDestepSum = new Float_t [AliMUONConstants::NCh()];
100 for (Int_t i=0; i<AliMUONConstants::NCh(); i++) {
101 fStepSum[i] =0.0;
102 fDestepSum[i]=0.0;
103 }
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);
111
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);
a9e2aefa 124}
125
fb1bf5c0 126//_____________________________________________________________________________
127AliMUONv1::AliMUONv1(const AliMUONv1& right)
128 : AliMUON(right)
129{
d19b6003 130/// Copy constructor (not implemented)
fb1bf5c0 131
8c343c7c 132 AliFatal("Copy constructor not provided.");
fb1bf5c0 133}
134
a9e2aefa 135//___________________________________________
acc838fd 136AliMUONv1::~AliMUONv1()
a9e2aefa 137{
d19b6003 138/// Destructor
139
140 AliDebug(1,Form("dtor this=%p",this));
d4bb94a1 141 delete [] fStepSum;
142 delete [] fDestepSum;
143 delete fElossRatio;
144 delete fAngleEffect10;
8109731a 145 delete fAngleEffectNorma;
acc838fd 146}
b17c0c87 147
fb1bf5c0 148//_____________________________________________________________________________
149AliMUONv1& AliMUONv1::operator=(const AliMUONv1& right)
150{
d19b6003 151/// Assignement operator (not implemented)
fb1bf5c0 152
153 // check assignement to self
154 if (this == &right) return *this;
155
8c343c7c 156 AliFatal("Assignement operator not provided.");
fb1bf5c0 157
158 return *this;
159}
160
acc838fd 161//__________________________________________________
162void AliMUONv1::CreateGeometry()
163{
d19b6003 164/// Construct geometry using geometry builder
a9e2aefa 165
d4bb94a1 166 fGeometryBuilder->CreateGeometry();
acc838fd 167}
a9e2aefa 168
acc838fd 169//________________________________________________________________
a9e2aefa 170void AliMUONv1::CreateMaterials()
171{
d19b6003 172/// Construct materials using geometry builder
acc838fd 173
d4bb94a1 174 fGeometryBuilder->CreateMaterials();
a9e2aefa 175}
176
acc838fd 177//___________________________________________
a9e2aefa 178void AliMUONv1::Init()
a713db22 179{
d19b6003 180/// Initialize geometry
181
edee5e63 182 AliDebug(1,"Start Init for version 1 - CPC chamber type");
002920d1 183
edee5e63 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{
d19b6003 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.
d4bb94a1 226
b7ef3c96 227 for (Int_t i = 0; i < AliMUONConstants::NCh(); i++) {
228 if ( GetGeometry()->GetModule(i)->IsSensitiveVolume(volId) )
229 return i+1;
230 }
d4bb94a1 231
232 return 0;
233}
333f7cda 234
235//_______________________________________________________________________________
236TString AliMUONv1::CurrentVolumePath() const
237{
d19b6003 238/// Return current volume path
239/// (Could be removed when this function is available via gMC)
333f7cda 240
241 TString path = "";
242 TString name;
243 Int_t copyNo;
244 Int_t imother = 0;
245 do {
246 name = gMC->CurrentVolOffName(imother);
247 gMC->CurrentVolOffID(imother++, copyNo);
248 TString add = "/";
249 add += name;
7ecf374b 250 add += "_";
333f7cda 251 add += copyNo;
252 path.Insert(0,add);
253 }
254 while ( name != TString("ALIC") );
255
256 return path;
257}
258
1391e633 259//_______________________________________________________________________________
c33d9661 260void AliMUONv1::StepManager()
261{
d19b6003 262/// Step manager for the chambers
263/// TBR
d59b2ec3 264
265 if (fStepManagerVersionDE) {
266 StepManager2();
267 return;
268 }
d7c4fbc4 269
c33d9661 270
271 // Only charged tracks
d59b2ec3 272 if( !(gMC->TrackCharge()) ) return;
1391e633 273 // Only charged tracks
274
c33d9661 275 // Only gas gap inside chamber
276 // Tag chambers and record hits when track enters
acc838fd 277 static Int_t idvol=-1;
1391e633 278 Int_t iChamber=0;
279 Int_t id=0;
280 Int_t copy;
281 const Float_t kBig = 1.e10;
282
acc838fd 283
284 //
285 // Only gas gap inside chamber
286 // Tag chambers and record hits when track enters
c33d9661 287 id=gMC->CurrentVolID(copy);
acc838fd 288 iChamber = GetChamberId(id);
289 idvol = iChamber -1;
290
291 if (idvol == -1) return;
abaf7c9d 292
967a2a25 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());
296
1391e633 297 if( gMC->IsTrackEntering() ) {
298 Float_t theta = fTrackMomentum.Theta();
4ac9d21e 299 if ((TMath::Pi()-theta)*kRaddeg>=15.) gMC->SetMaxStep(fStepMaxInActiveGas); // We use Pi-theta because z is negative
300 }
abaf7c9d 301
5a0e88a7 302 // AliDebug(1,
303 // Form("Active volume found %d chamber %d Z chamber is %f ",idvol,iChamber,
304 // ( (AliMUONChamber*)(*fChambers)[idvol])->Z()));
305 // Particule id and mass,
1391e633 306 Int_t ipart = gMC->TrackPid();
307 Float_t mass = gMC->TrackMass();
308
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();
abaf7c9d 313
5a0e88a7 314 // if(AliDebugLevel()) {
315 // AliDebug(1,
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()));
319 // AliDebug(1,
320 // Form("Track Momentum %f %f %f", fTrackMomentum.X(), fTrackMomentum.Y(),
321 // fTrackMomentum.Z()));
322 // gMC->TrackPosition(fTrackPosition);
323 // AliDebug(1,
324 // Form("Track Position %f %f %f",fTrackPosition.X(),fTrackPosition.Y(),
325 // fTrackPosition.Z())) ;
326 // }
1391e633 327
328 // Track left chamber or StepSum larger than fStepMaxInActiveGas
329 if ( gMC->IsTrackExiting() ||
330 gMC->IsTrackStop() ||
331 gMC->IsTrackDisappeared()||
332 (fStepSum[idvol]>fStepMaxInActiveGas) ) {
333
334 if ( gMC->IsTrackExiting() ||
acc838fd 335 gMC->IsTrackStop() ||
336 gMC->IsTrackDisappeared() ) gMC->SetMaxStep(kBig);
1391e633 337
338 gMC->TrackPosition(fTrackPosition);
339 Float_t theta = fTrackMomentum.Theta();
340 Float_t phi = fTrackMomentum.Phi();
341
d7c4fbc4 342 TLorentzVector backToWire( fStepSum[idvol]/2.*sin(theta)*cos(phi),
acc838fd 343 fStepSum[idvol]/2.*sin(theta)*sin(phi),
344 fStepSum[idvol]/2.*cos(theta),0.0 );
5a0e88a7 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()) ;
d7c4fbc4 349 fTrackPosition-=backToWire;
1391e633 350
351 //-------------- Angle effect
352 // Ratio between energy loss of particle and Mip as a function of BetaGamma of particle (Energy/Mass)
353
30178c30 354 Float_t betaxGamma = fTrackMomentum.P()/mass;// pc/mc2
d7c4fbc4 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
360
374ebd7d 361
362 if (fAngleEffect){
30178c30 363 if ( (betaxGamma >3.2) && (thetawires*kRaddeg<=15.) ) {
364 betaxGamma=TMath::Log(betaxGamma);
365 eLossParticleELossMip = fElossRatio->Eval(betaxGamma);
1391e633 366 // 10 degrees is a reference for a model (arbitrary)
d7c4fbc4 367 sigmaEffect10degrees=fAngleEffect10->Eval(eLossParticleELossMip);// in micrometers
1391e633 368 // Angle with respect to the wires assuming that chambers are perpendicular to the z axis.
d7c4fbc4 369 sigmaEffectThetadegrees = sigmaEffect10degrees/fAngleEffectNorma->Eval(thetawires*kRaddeg); // For 5mm gap
1391e633 370 if ( (iChamber==1) || (iChamber==2) )
acc838fd 371 sigmaEffectThetadegrees/=(1.09833e+00+1.70000e-02*(thetawires*kRaddeg)); // The gap is different (4mm)
d7c4fbc4 372 yAngleEffect=1.e-04*gRandom->Gaus(0,sigmaEffectThetadegrees); // Error due to the angle effect in cm
1391e633 373 }
374ebd7d 374 }
1391e633 375
333f7cda 376 // Detection elements ids
b7ef3c96 377 const AliMUONGeometryModule* kGeometryModule
378 = GetGeometry()->GetModule(iChamber-1);
e118b27e 379
380 AliMUONGeometryDetElement* detElement
b7ef3c96 381 = kGeometryModule->FindBySensitiveVolume(CurrentVolumePath());
e118b27e 382
333f7cda 383 Int_t detElemId = 0;
e118b27e 384 if (detElement) detElemId = detElement->GetUniqueID();
333f7cda 385
386 if (!detElemId) {
387 cerr << "Chamber id: "
388 << setw(3) << iChamber << " "
389 << "Current SV: "
390 << CurrentVolumePath()
391 << " detElemId: "
392 << setw(5) << detElemId
393 << endl;
394 Double_t x, y, z;
395 gMC->TrackPosition(x, y, z);
396 cerr << " global position: "
397 << x << ", " << y << ", " << z
398 << endl;
8c343c7c 399 AliWarning("DetElemId not identified.");
333f7cda 400 }
401
1391e633 402 // One hit per chamber
47464038 403 GetMUONData()->AddHit(fIshunt,
404 gAlice->GetMCApp()->GetCurrentTrackNumber(),
405 iChamber, ipart,
406 fTrackPosition.X(),
407 fTrackPosition.Y()+yAngleEffect,
408 fTrackPosition.Z(),
409 gMC->TrackTime(),
410 fTrackMomentum.P(),
411 theta,
412 phi,
413 fStepSum[idvol],
414 fDestepSum[idvol],
415 fTrackPosition.X(),
416 fTrackPosition.Y(),
417 fTrackPosition.Z());
418
5a0e88a7 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())) ;
1391e633 423// }
424 fStepSum[idvol] =0; // Reset for the next event
425 fDestepSum[idvol]=0; // Reset for the next event
426 }
abaf7c9d 427}
5f91c9e8 428
d59b2ec3 429//_______________________________________________________________________________
430void AliMUONv1::StepManager2()
431{
d19b6003 432/// Step manager for the chambers
d59b2ec3 433
d59b2ec3 434 // Only charged tracks
435 if( !(gMC->TrackCharge()) ) return;
436 // Only charged tracks
437
438 // Only gas gap inside chamber
439 // Tag chambers and record hits when track enters
c5ce4e69 440 static Int_t idvol=-1, iEnter = 0;
d59b2ec3 441 Int_t iChamber=0;
442 Int_t id=0;
443 Int_t copy;
444 const Float_t kBig = 1.e10;
c5ce4e69 445 static Double_t xyzEnter[3];
d59b2ec3 446
447 //
448 // Only gas gap inside chamber
449 // Tag chambers and record hits when track enters
450 id=gMC->CurrentVolID(copy);
451 iChamber = GetChamberId(id);
452 idvol = iChamber -1;
453
454 if (idvol == -1) return;
455
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());
459
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
c5ce4e69 463 iEnter = 1;
464 gMC->TrackPosition(xyzEnter[0], xyzEnter[1], xyzEnter[2]); // save coordinates of entrance point
d59b2ec3 465 }
466
5a0e88a7 467 // AliDebug(1,
468 // Form("Active volume found %d chamber %d Z chamber is %f ",idvol,iChamber,
469 // ( (AliMUONChamber*)(*fChambers)[idvol])->Z())) ;
d59b2ec3 470 // Particule id and mass,
471 Int_t ipart = gMC->TrackPid();
472 Float_t mass = gMC->TrackMass();
473
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();
478
5a0e88a7 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())) ;
488 //}
d59b2ec3 489
490 // Track left chamber or StepSum larger than fStepMaxInActiveGas
491 if ( gMC->IsTrackExiting() ||
492 gMC->IsTrackStop() ||
493 gMC->IsTrackDisappeared()||
494 (fStepSum[idvol]>fStepMaxInActiveGas) ) {
495
496 if ( gMC->IsTrackExiting() ||
497 gMC->IsTrackStop() ||
498 gMC->IsTrackDisappeared() ) gMC->SetMaxStep(kBig);
c5ce4e69 499 if (fDestepSum[idvol] == 0) {
500 // AZ - no energy release
501 fStepSum[idvol] = 0; // Reset for the next event
502 iEnter = 0;
503 return;
504 }
d59b2ec3 505
506 gMC->TrackPosition(fTrackPosition);
507 Float_t theta = fTrackMomentum.Theta();
508 Float_t phi = fTrackMomentum.Phi();
509
795b3f56 510 Int_t merge = 0;
511 Double_t xyz0[3]={0}, xyz1[3]={0}, tmp[3]={0};
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
c5ce4e69 520 gMC->Gmtod(xyzEnter, xyz0, 1); // local coord. at the entrance
521
522 fTrackPosition.Vect().GetXYZ(tmp);
523 gMC->Gmtod(tmp, xyz1, 1); // local coord. at the exit
795b3f56 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;
528 }
c5ce4e69 529
795b3f56 530 if (merge) {
c5ce4e69 531 Double_t dz = -0.5;
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());
538 } else {
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);
544 // AliDebug(1,
545 // Form("Track Position %f %f %f",fTrackPosition.X(),fTrackPosition.Y(),fTrackPosition.Z()));
546 // AliDebug(1,
547 // Form("Exit: Track backToWire %f %f %f",backToWire.X(),backToWire.Y(),backToWire.Z())) ;
548 }
d59b2ec3 549
550 //-------------- Angle effect
551 // Ratio between energy loss of particle and Mip as a function of BetaGamma of particle (Energy/Mass)
552
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
559
560
561 if (fAngleEffect){
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
572 }
573 }
574
575 // Detection elements ids
b7ef3c96 576 const AliMUONGeometryModule* kGeometryModule
577 = GetGeometry()->GetModule(iChamber-1);
d59b2ec3 578
579 AliMUONGeometryDetElement* detElement
b7ef3c96 580 = kGeometryModule->FindBySensitiveVolume(CurrentVolumePath());
d59b2ec3 581
582 Int_t detElemId = 0;
583 if (detElement) detElemId = detElement->GetUniqueID();
584
585 if (!detElemId) {
586 cerr << "Chamber id: "
587 << setw(3) << iChamber << " "
588 << "Current SV: "
589 << CurrentVolumePath()
590 << " detElemId: "
591 << setw(5) << detElemId
592 << endl;
593 Double_t x, y, z;
594 gMC->TrackPosition(x, y, z);
595 cerr << " global position: "
596 << x << ", " << y << ", " << z
597 << endl;
598 AliError("DetElemId not identified.");
599 }
600
601 // One hit per chamber
8690a0a6 602 GetMUONData()->AddHit2(fIshunt,
d59b2ec3 603 gAlice->GetMCApp()->GetCurrentTrackNumber(),
604 detElemId, ipart,
605 fTrackPosition.X(),
606 fTrackPosition.Y()+yAngleEffect,
607 fTrackPosition.Z(),
608 gMC->TrackTime(),
609 fTrackMomentum.P(),
610 theta,
611 phi,
612 fStepSum[idvol],
613 fDestepSum[idvol],
614 fTrackPosition.X(),
615 fTrackPosition.Y(),
616 fTrackPosition.Z());
617
5a0e88a7 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()) ;
621
d59b2ec3 622 fStepSum[idvol] =0; // Reset for the next event
623 fDestepSum[idvol]=0; // Reset for the next event
c5ce4e69 624 iEnter = 0;
d59b2ec3 625 }
626}