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>
25 #include <TLorentzVector.h>
29 #include <TGeoMatrix.h>
30 #include <TVirtualMC.h>
31 #include <TParticle.h>
34 #include "AliMUONChamber.h"
35 #include "AliMUONConstants.h"
36 #include "AliMUONFactory.h"
37 #include "AliMUONHit.h"
38 #include "AliMUONTriggerCircuit.h"
39 #include "AliMUONv1.h"
40 #include "AliMUONVGeometryBuilder.h"
41 #include "AliMUONChamberGeometry.h"
42 #include "AliMUONGeometryEnvelope.h"
43 #include "AliMUONGeometryConstituent.h"
50 //___________________________________________
51 AliMUONv1::AliMUONv1() : AliMUON()
52 ,fTrackMomentum(), fTrackPosition(),fGlobalTransformation(0)
56 fStepManagerVersionOld = kFALSE;
58 fStepMaxInActiveGas = 0.6;
63 fAngleEffectNorma= 0x0;
65 //___________________________________________
66 AliMUONv1::AliMUONv1(const char *name, const char *title)
67 : AliMUON(name,title), fTrackMomentum(), fTrackPosition()
70 // By default include all stations
71 AliMUONFactory factory;
72 factory.Build(this, title);
74 fStepManagerVersionOld = kFALSE;
76 fStepMaxInActiveGas = 0.6;
78 fStepSum = new Float_t [AliMUONConstants::NCh()];
79 fDestepSum = new Float_t [AliMUONConstants::NCh()];
80 for (Int_t i=0; i<AliMUONConstants::NCh(); i++) {
84 // Ratio of particle mean eloss with respect MIP's Khalil Boudjemline, sep 2003, PhD.Thesis and Particle Data Book
85 fElossRatio = new TF1("ElossRatio","[0]+[1]*x+[2]*x*x+[3]*x*x*x+[4]*x*x*x*x",0.5,5.);
86 fElossRatio->SetParameter(0,1.02138);
87 fElossRatio->SetParameter(1,-9.54149e-02);
88 fElossRatio->SetParameter(2,+7.83433e-02);
89 fElossRatio->SetParameter(3,-9.98208e-03);
90 fElossRatio->SetParameter(4,+3.83279e-04);
92 // Angle effect in tracking chambers at theta =10 degres as a function of ElossRatio (Khalil BOUDJEMLINE sep 2003 Ph.D Thesis) (in micrometers)
93 fAngleEffect10 = new TF1("AngleEffect10","[0]+[1]*x+[2]*x*x",0.5,3.0);
94 fAngleEffect10->SetParameter(0, 1.90691e+02);
95 fAngleEffect10->SetParameter(1,-6.62258e+01);
96 fAngleEffect10->SetParameter(2,+1.28247e+01);
97 // Angle effect: Normalisation form theta=10 degres to theta between 0 and 10 (Khalil BOUDJEMLINE sep 2003 Ph.D Thesis)
98 // Angle with respect to the wires assuming that chambers are perpendicular to the z axis.
99 fAngleEffectNorma = new TF1("AngleEffectNorma","[0]+[1]*x+[2]*x*x+[3]*x*x*x",0.0,10.0);
100 fAngleEffectNorma->SetParameter(0,4.148);
101 fAngleEffectNorma->SetParameter(1,-6.809e-01);
102 fAngleEffectNorma->SetParameter(2,5.151e-02);
103 fAngleEffectNorma->SetParameter(3,-1.490e-03);
105 // Define the global transformation:
106 // Transformation from the old ALICE coordinate system to a new one:
108 TGeoRotation* rotGlobal
109 = new TGeoRotation("rotGlobal", 90., 180., 90., 90., 180., 0.);
110 fGlobalTransformation = new TGeoCombiTrans(0., 0., 0., rotGlobal);
113 //_____________________________________________________________________________
114 AliMUONv1::AliMUONv1(const AliMUONv1& right)
117 // copy constructor (not implemented)
119 Fatal("AliMUONv1", "Copy constructor not provided.");
122 //___________________________________________
123 AliMUONv1::~AliMUONv1()
127 delete fGlobalTransformation;
130 //_____________________________________________________________________________
131 AliMUONv1& AliMUONv1::operator=(const AliMUONv1& right)
133 // assignement operator (not implemented)
135 // check assignement to self
136 if (this == &right) return *this;
138 Fatal("operator =", "Assignement operator not provided.");
143 //__________________________________________________
144 void AliMUONv1::CreateGeometry()
147 // Construct geometry using geometry builders.
150 for (Int_t i=0; i<fGeometryBuilders->GetEntriesFast(); i++) {
153 AliMUONVGeometryBuilder* builder
154 = (AliMUONVGeometryBuilder*)fGeometryBuilders->At(i);
156 // Create geometry with each builder
158 builder->CreateGeometry();
159 builder->SetTransformations();
163 for (Int_t j=0; j<AliMUONConstants::NCh(); j++) {
165 AliMUONChamberGeometry* geometry = Chamber(j).GetGeometry();
167 if (!geometry) continue;
168 // Skip chambers with not defined geometry
170 // Loop over envelopes
171 const TObjArray* kEnvelopes = geometry->GetEnvelopes();
172 for (Int_t k=0; k<kEnvelopes->GetEntriesFast(); k++) {
175 AliMUONGeometryEnvelope* env = (AliMUONGeometryEnvelope*)kEnvelopes->At(k);
176 const TGeoCombiTrans* kEnvTrans = env->GetTransformation();
178 if (env->IsVirtual() && env->GetConstituents()->GetEntriesFast() == 0 ) {
179 // virtual envelope + nof constituents = 0
181 // empty virtual envelope has no sense
182 Fatal("CreateGeometry", "Virtual envelope must have constituents.");
186 if (!env->IsVirtual() && env->GetConstituents()->GetEntriesFast() > 0 ) {
187 // non virtual envelope + nof constituents > 0
189 // use VMC to place constituents
190 Fatal("CreateGeometry", "Non virtual envelope cannot have constituents.");
194 if (!env->IsVirtual() && env->GetConstituents()->GetEntriesFast() == 0 ) {
195 // non virtual envelope + nof constituents = 0
196 // => place envelope in ALICE by composed transformation:
197 // Tglobal * Tch * Tenv
199 // Compound chamber transformation with the envelope one
201 = (*fGlobalTransformation) *
202 (*geometry->GetTransformation()) *
204 PlaceVolume(env->GetName(), geometry->GetMotherVolume(),
205 env->GetCopyNo(), total, 0, 0);
208 if (env->IsVirtual() && env->GetConstituents()->GetEntriesFast() > 0 ) {
209 // virtual envelope + nof constituents > 0
210 // => do not place envelope and place constituents
211 // in ALICE by composed transformation:
212 // Tglobal * Tch * Tenv * Tconst
214 for (Int_t l=0; l<env->GetConstituents()->GetEntriesFast(); l++) {
215 AliMUONGeometryConstituent* constituent
216 = (AliMUONGeometryConstituent*)env->GetConstituents()->At(l);
218 // Compound chamber transformation with the envelope one + the constituent one
220 = (*fGlobalTransformation) *
221 (*geometry->GetTransformation()) *
223 (*constituent->GetTransformation());
225 PlaceVolume(constituent->GetName(), geometry->GetMotherVolume(),
226 constituent->GetCopyNo(), total,
227 constituent->GetNpar(), constituent->GetParam());
233 //__________________________________________________________________
234 Int_t AliMUONv1::GetChamberId(Int_t volId) const
236 // Check if the volume with specified volId is a sensitive volume (gas)
237 // of some chamber and returns the chamber number;
238 // if not sensitive volume - return 0.
242 for (Int_t i = 1; i <= AliMUONConstants::NCh(); i++)
243 if (volId==((AliMUONChamber*)(*fChambers)[i-1])->GetGid()) return i;
245 for (Int_t i = 1; i <= AliMUONConstants::NCh(); i++)
246 if ( ((AliMUONChamber*)(*fChambers)[i-1])->IsSensId(volId) ) return i;
250 //________________________________________________________________
251 void AliMUONv1::CreateMaterials()
254 // *** DEFINITION OF AVAILABLE MUON MATERIALS ***
256 // Ar-CO2 gas (80%+20%)
257 Float_t ag1[3] = { 39.95,12.01,16. };
258 Float_t zg1[3] = { 18.,6.,8. };
259 Float_t wg1[3] = { .8,.0667,.13333 };
260 Float_t dg1 = .001821;
262 // Ar-buthane-freon gas -- trigger chambers
263 Float_t atr1[4] = { 39.95,12.01,1.01,19. };
264 Float_t ztr1[4] = { 18.,6.,1.,9. };
265 Float_t wtr1[4] = { .56,.1262857,.2857143,.028 };
266 Float_t dtr1 = .002599;
269 Float_t agas[3] = { 39.95,12.01,16. };
270 Float_t zgas[3] = { 18.,6.,8. };
271 Float_t wgas[3] = { .74,.086684,.173316 };
272 Float_t dgas = .0018327;
274 // Ar-Isobutane gas (80%+20%) -- tracking
275 Float_t ag[3] = { 39.95,12.01,1.01 };
276 Float_t zg[3] = { 18.,6.,1. };
277 Float_t wg[3] = { .8,.057,.143 };
278 Float_t dg = .0019596;
280 // Ar-Isobutane-Forane-SF6 gas (49%+7%+40%+4%) -- trigger
281 Float_t atrig[5] = { 39.95,12.01,1.01,19.,32.066 };
282 Float_t ztrig[5] = { 18.,6.,1.,9.,16. };
283 Float_t wtrig[5] = { .49,1.08,1.5,1.84,0.04 };
284 Float_t dtrig = .0031463;
288 Float_t abak[3] = {12.01 , 1.01 , 16.};
289 Float_t zbak[3] = {6. , 1. , 8.};
290 Float_t wbak[3] = {6. , 6. , 1.};
293 Float_t epsil, stmin, deemax, tmaxfd, stemax;
295 Int_t iSXFLD = gAlice->Field()->Integ();
296 Float_t sXMGMX = gAlice->Field()->Max();
298 // --- Define the various materials for GEANT ---
299 AliMaterial(9, "ALUMINIUM$", 26.98, 13., 2.7, 8.9, 37.2);
300 AliMaterial(10, "ALUMINIUM$", 26.98, 13., 2.7, 8.9, 37.2);
301 AliMaterial(15, "AIR$ ", 14.61, 7.3, .001205, 30423.24, 67500);
302 AliMixture(19, "Bakelite$", abak, zbak, dbak, -3, wbak);
303 AliMixture(20, "ArC4H10 GAS$", ag, zg, dg, 3, wg);
304 AliMixture(21, "TRIG GAS$", atrig, ztrig, dtrig, -5, wtrig);
305 AliMixture(22, "ArCO2 80%$", ag1, zg1, dg1, 3, wg1);
306 AliMixture(23, "Ar-freon $", atr1, ztr1, dtr1, 4, wtr1);
307 AliMixture(24, "ArCO2 GAS$", agas, zgas, dgas, 3, wgas);
308 // materials for slat:
309 // Sensitive area: gas (already defined)
311 // insulating material and frame: vetronite
312 // walls: carbon, rohacell, carbon
313 Float_t aglass[5]={12.01, 28.09, 16., 10.8, 23.};
314 Float_t zglass[5]={ 6., 14., 8., 5., 11.};
315 Float_t wglass[5]={ 0.5, 0.105, 0.355, 0.03, 0.01};
318 // rohacell: C9 H13 N1 O2
319 Float_t arohac[4] = {12.01, 1.01, 14.010, 16.};
320 Float_t zrohac[4] = { 6., 1., 7., 8.};
321 Float_t wrohac[4] = { 9., 13., 1., 2.};
322 Float_t drohac = 0.03;
324 AliMaterial(31, "COPPER$", 63.54, 29., 8.96, 1.4, 0.);
325 AliMixture(32, "Vetronite$",aglass, zglass, dglass, 5, wglass);
326 AliMaterial(33, "Carbon$", 12.01, 6., 2.265, 18.8, 49.9);
327 AliMixture(34, "Rohacell$", arohac, zrohac, drohac, -4, wrohac);
330 epsil = .001; // Tracking precision,
331 stemax = -1.; // Maximum displacement for multiple scat
332 tmaxfd = -20.; // Maximum angle due to field deflection
333 deemax = -.3; // Maximum fractional energy loss, DLS
337 AliMedium(1, "AIR_CH_US ", 15, 1, iSXFLD, sXMGMX, tmaxfd, stemax, deemax, epsil, stmin);
341 AliMedium(4, "ALU_CH_US ", 9, 0, iSXFLD, sXMGMX, tmaxfd, fMaxStepAlu,
342 fMaxDestepAlu, epsil, stmin);
343 AliMedium(5, "ALU_CH_US ", 10, 0, iSXFLD, sXMGMX, tmaxfd, fMaxStepAlu,
344 fMaxDestepAlu, epsil, stmin);
348 AliMedium(6, "AR_CH_US ", 20, 1, iSXFLD, sXMGMX, tmaxfd, fMaxStepGas,
349 fMaxDestepGas, epsil, stmin);
351 // Ar-Isobuthane-Forane-SF6 gas
353 AliMedium(7, "GAS_CH_TRIGGER ", 21, 1, iSXFLD, sXMGMX, tmaxfd, stemax, deemax, epsil, stmin);
355 AliMedium(8, "BAKE_CH_TRIGGER ", 19, 0, iSXFLD, sXMGMX, tmaxfd, fMaxStepAlu,
356 fMaxDestepAlu, epsil, stmin);
358 AliMedium(9, "ARG_CO2 ", 22, 1, iSXFLD, sXMGMX, tmaxfd, fMaxStepGas,
359 fMaxDestepAlu, epsil, stmin);
360 // tracking media for slats: check the parameters!!
361 AliMedium(11, "PCB_COPPER ", 31, 0, iSXFLD, sXMGMX, tmaxfd,
362 fMaxStepAlu, fMaxDestepAlu, epsil, stmin);
363 AliMedium(12, "VETRONITE ", 32, 0, iSXFLD, sXMGMX, tmaxfd,
364 fMaxStepAlu, fMaxDestepAlu, epsil, stmin);
365 AliMedium(13, "CARBON ", 33, 0, iSXFLD, sXMGMX, tmaxfd,
366 fMaxStepAlu, fMaxDestepAlu, epsil, stmin);
367 AliMedium(14, "Rohacell ", 34, 0, iSXFLD, sXMGMX, tmaxfd,
368 fMaxStepAlu, fMaxDestepAlu, epsil, stmin);
372 //.Materials specific to stations
373 // created via builders
375 for (Int_t i=0; i<fGeometryBuilders->GetEntriesFast(); i++) {
378 AliMUONVGeometryBuilder* builder
379 = (AliMUONVGeometryBuilder*)fGeometryBuilders->At(i);
381 // Create materials with each builder
382 if (builder) builder->CreateMaterials();
386 //______________________________________________________________________________
387 void AliMUONv1::PlaceVolume(const TString& name, const TString& mName,
388 Int_t copyNo, const TGeoHMatrix& matrix,
389 Int_t npar, Double_t* param) const
391 // Place the volume specified by name with the given transformation matrix
394 // Do not apply global transformation
395 // if mother volume == DDIP
396 // (as it is applied on this volume)
397 TGeoHMatrix transform(matrix);
398 if (mName == TString("DDIP")) {
399 transform = (*fGlobalTransformation) * transform;
400 // To be changed to (*fGlobalTransformation).inverse()
401 // when available in TGeo
402 // To make this correct also for a general case when
403 // (*fGlobalTransformation) * *fGlobalTransformation) != 1
406 // Decompose transformation
407 const Double_t* xyz = transform.GetTranslation();
408 const Double_t* rm = transform.GetRotationMatrix();
410 //cout << "Got translation: "
411 // << xyz[0] << " " << xyz[1] << " " << xyz[2] << endl;
413 //cout << "Got rotation: "
414 // << rm[0] << " " << rm[1] << " " << rm[2] << endl
415 // << rm[3] << " " << rm[4] << " " << rm[5] << endl
416 // << rm[6] << " " << rm[7] << " " << rm[8] << endl;
418 // Check for presence of rotation
419 // (will be nice to be available in TGeo)
420 const Double_t kTolerance = 1e-04;
421 Bool_t isRotation = true;
422 if (TMath::Abs(rm[0] - 1.) < kTolerance &&
423 TMath::Abs(rm[1] - 0.) < kTolerance &&
424 TMath::Abs(rm[2] - 0.) < kTolerance &&
425 TMath::Abs(rm[3] - 0.) < kTolerance &&
426 TMath::Abs(rm[4] - 1.) < kTolerance &&
427 TMath::Abs(rm[5] - 0.) < kTolerance &&
428 TMath::Abs(rm[6] - 0.) < kTolerance &&
429 TMath::Abs(rm[7] - 0.) < kTolerance &&
430 TMath::Abs(rm[8] - 1.) < kTolerance) isRotation = false;
435 rot.SetMatrix(const_cast<Double_t*>(transform.GetRotationMatrix()));
436 Double_t theta1, phi1, theta2, phi2, theta3, phi3;
437 rot.GetAngles(theta1, phi1, theta2, phi2, theta3, phi3);
440 // << theta1 << " " << phi1 << " "
441 // << theta2 << " " << phi2 << " "
442 // << theta3 << " " << phi3 << endl;
444 AliMatrix(krot, theta1, phi1, theta2, phi2, theta3, phi3);
447 // Place the volume in ALIC
449 gMC->Gspos(name, copyNo, mName, xyz[0], xyz[1], xyz[2] , krot, "ONLY");
451 gMC->Gsposp(name, copyNo, mName, xyz[0], xyz[1], xyz[2] , krot, "ONLY",
456 //___________________________________________
457 void AliMUONv1::Init()
460 // Initialize Tracking Chambers
463 if(fDebug) printf("\n%s: Start Init for version 1 - CPC chamber type\n\n",ClassName());
465 for (i=0; i<AliMUONConstants::NCh(); i++) {
466 ( (AliMUONChamber*) (*fChambers)[i])->Init();
470 // Set the chamber (sensitive region) GEANT identifier
472 for (Int_t i=0; i<fGeometryBuilders->GetEntriesFast(); i++) {
475 AliMUONVGeometryBuilder* builder
476 = (AliMUONVGeometryBuilder*)fGeometryBuilders->At(i);
478 // Set sesitive volumes with each builder
479 if (builder) builder->SetSensitiveVolumes();
484 // Set the chamber (sensitive region) GEANT identifier
485 ((AliMUONChamber*)(*fChambers)[0])->SetGid(gMC->VolId("S01G"));
486 ((AliMUONChamber*)(*fChambers)[1])->SetGid(gMC->VolId("S02G"));
488 ((AliMUONChamber*)(*fChambers)[2])->SetGid(gMC->VolId("S03G"));
489 ((AliMUONChamber*)(*fChambers)[3])->SetGid(gMC->VolId("S04G"));
491 ((AliMUONChamber*)(*fChambers)[4])->SetGid(gMC->VolId("S05G"));
492 ((AliMUONChamber*)(*fChambers)[5])->SetGid(gMC->VolId("S06G"));
494 ((AliMUONChamber*)(*fChambers)[6])->SetGid(gMC->VolId("S07G"));
495 ((AliMUONChamber*)(*fChambers)[7])->SetGid(gMC->VolId("S08G"));
497 ((AliMUONChamber*)(*fChambers)[8])->SetGid(gMC->VolId("S09G"));
498 ((AliMUONChamber*)(*fChambers)[9])->SetGid(gMC->VolId("S10G"));
500 ((AliMUONChamber*)(*fChambers)[10])->SetGid(gMC->VolId("SG1A"));
501 ((AliMUONChamber*)(*fChambers)[11])->SetGid(gMC->VolId("SG2A"));
502 ((AliMUONChamber*)(*fChambers)[12])->SetGid(gMC->VolId("SG3A"));
503 ((AliMUONChamber*)(*fChambers)[13])->SetGid(gMC->VolId("SG4A"));
505 if(fDebug) printf("\n%s: Finished Init for version 1 - CPC chamber type\n",ClassName());
508 if(fDebug) printf("\n%s: Start Init for Trigger Circuits\n",ClassName());
509 for (i=0; i<AliMUONConstants::NTriggerCircuit(); i++) {
510 ( (AliMUONTriggerCircuit*) (*fTriggerCircuits)[i])->Init(i);
512 if(fDebug) printf("%s: Finished Init for Trigger Circuits\n",ClassName());
516 //_______________________________________________________________________________
517 void AliMUONv1::StepManager()
519 // Stepmanager for the chambers
521 if (fStepManagerVersionOld) {
526 // Only charged tracks
527 if( !(gMC->TrackCharge()) ) return;
528 // Only charged tracks
530 // Only gas gap inside chamber
531 // Tag chambers and record hits when track enters
532 static Int_t idvol=-1;
536 const Float_t kBig = 1.e10;
540 // Only gas gap inside chamber
541 // Tag chambers and record hits when track enters
542 id=gMC->CurrentVolID(copy);
543 iChamber = GetChamberId(id);
546 if (idvol == -1) return;
548 if( gMC->IsTrackEntering() ) {
549 Float_t theta = fTrackMomentum.Theta();
550 if ((TMath::Pi()-theta)*kRaddeg>=15.) gMC->SetMaxStep(fStepMaxInActiveGas); // We use Pi-theta because z is negative
554 // Float_t z = ( (AliMUONChamber*)(*fChambers)[idvol])->Z() ;
555 // Info("StepManager Step","Active volume found %d chamber %d Z chamber is %f ",idvol,iChamber, z);
557 // Particule id and mass,
558 Int_t ipart = gMC->TrackPid();
559 Float_t mass = gMC->TrackMass();
561 fDestepSum[idvol]+=gMC->Edep();
562 // Get current particle id (ipart), track position (pos) and momentum (mom)
563 if ( fStepSum[idvol]==0.0 ) gMC->TrackMomentum(fTrackMomentum);
564 fStepSum[idvol]+=gMC->TrackStep();
567 // Info("StepManager Step","iChamber %d, Particle %d, theta %f phi %f mass %f StepSum %f eloss %g",
568 // iChamber,ipart, fTrackMomentum.Theta()*kRaddeg, fTrackMomentum.Phi()*kRaddeg, mass, fStepSum[idvol], gMC->Edep());
569 // Info("StepManager Step","Track Momentum %f %f %f", fTrackMomentum.X(), fTrackMomentum.Y(), fTrackMomentum.Z()) ;
570 // gMC->TrackPosition(fTrackPosition);
571 // Info("StepManager Step","Track Position %f %f %f",fTrackPosition.X(),fTrackPosition.Y(),fTrackPosition.Z()) ;
574 // Track left chamber or StepSum larger than fStepMaxInActiveGas
575 if ( gMC->IsTrackExiting() ||
576 gMC->IsTrackStop() ||
577 gMC->IsTrackDisappeared()||
578 (fStepSum[idvol]>fStepMaxInActiveGas) ) {
580 if ( gMC->IsTrackExiting() ||
581 gMC->IsTrackStop() ||
582 gMC->IsTrackDisappeared() ) gMC->SetMaxStep(kBig);
584 gMC->TrackPosition(fTrackPosition);
585 Float_t theta = fTrackMomentum.Theta();
586 Float_t phi = fTrackMomentum.Phi();
588 TLorentzVector backToWire( fStepSum[idvol]/2.*sin(theta)*cos(phi),
589 fStepSum[idvol]/2.*sin(theta)*sin(phi),
590 fStepSum[idvol]/2.*cos(theta),0.0 );
592 // Info("StepManager Exit","Track Position %f %f %f",fTrackPosition.X(),fTrackPosition.Y(),fTrackPosition.Z()) ;
594 // Info("StepManager Exit ","Track backToWire %f %f %f",backToWire.X(),backToWire.Y(),backToWire.Z()) ;
595 fTrackPosition-=backToWire;
597 //-------------- Angle effect
598 // Ratio between energy loss of particle and Mip as a function of BetaGamma of particle (Energy/Mass)
600 Float_t BetaxGamma = fTrackMomentum.P()/mass;// pc/mc2
601 Float_t sigmaEffect10degrees;
602 Float_t sigmaEffectThetadegrees;
603 Float_t eLossParticleELossMip;
604 Float_t yAngleEffect=0.;
605 Float_t thetawires = TMath::Abs( TMath::ASin( TMath::Sin(TMath::Pi()-theta) * TMath::Sin(phi) ) );// We use Pi-theta because z is negative
609 if ( (BetaxGamma >3.2) && (thetawires*kRaddeg<=15.) ) {
610 BetaxGamma=TMath::Log(BetaxGamma);
611 eLossParticleELossMip = fElossRatio->Eval(BetaxGamma);
612 // 10 degrees is a reference for a model (arbitrary)
613 sigmaEffect10degrees=fAngleEffect10->Eval(eLossParticleELossMip);// in micrometers
614 // Angle with respect to the wires assuming that chambers are perpendicular to the z axis.
615 sigmaEffectThetadegrees = sigmaEffect10degrees/fAngleEffectNorma->Eval(thetawires*kRaddeg); // For 5mm gap
616 if ( (iChamber==1) || (iChamber==2) )
617 sigmaEffectThetadegrees/=(1.09833e+00+1.70000e-02*(thetawires*kRaddeg)); // The gap is different (4mm)
618 yAngleEffect=1.e-04*gRandom->Gaus(0,sigmaEffectThetadegrees); // Error due to the angle effect in cm
622 // One hit per chamber
623 GetMUONData()->AddHit(fIshunt, gAlice->GetMCApp()->GetCurrentTrackNumber(), iChamber, ipart,
624 fTrackPosition.X(), fTrackPosition.Y()+yAngleEffect, fTrackPosition.Z(), 0.0,
625 fTrackMomentum.P(),theta, phi, fStepSum[idvol], fDestepSum[idvol],
626 fTrackPosition.X(),fTrackPosition.Y(),fTrackPosition.Z());
628 // Info("StepManager Exit","Particle exiting from chamber %d",iChamber);
629 // Info("StepManager Exit","StepSum %f eloss geant %g ",fStepSum[idvol],fDestepSum[idvol]);
630 // Info("StepManager Exit","Track Position %f %f %f",fTrackPosition.X(),fTrackPosition.Y(),fTrackPosition.Z()) ;
632 fStepSum[idvol] =0; // Reset for the next event
633 fDestepSum[idvol]=0; // Reset for the next event
637 //__________________________________________
638 void AliMUONv1::StepManagerOld()
640 // Old Stepmanager for the chambers
642 static Int_t idvol =-1;
648 Float_t destep, step;
650 static Float_t sstep;
651 static Float_t eloss, eloss2, xhit, yhit, zhit, tof, tlength;
652 const Float_t kBig = 1.e10;
653 static Float_t hits[15];
655 TClonesArray &lhits = *fHits;
659 // Only charged tracks
660 if( !(gMC->TrackCharge()) ) return;
662 // Only gas gap inside chamber
663 // Tag chambers and record hits when track enters
664 id=gMC->CurrentVolID(copy);
665 vol[0] = GetChamberId(id);
668 if (idvol == -1) return;
671 // Get current particle id (ipart), track position (pos) and momentum (mom)
672 gMC->TrackPosition(pos);
673 gMC->TrackMomentum(mom);
675 ipart = gMC->TrackPid();
678 // momentum loss and steplength in last step
679 destep = gMC->Edep();
680 step = gMC->TrackStep();
681 // cout<<"------------"<<step<<endl;
683 // record hits when track enters ...
684 if( gMC->IsTrackEntering()) {
686 gMC->SetMaxStep(fMaxStepGas);
687 Double_t tc = mom[0]*mom[0]+mom[1]*mom[1];
688 Double_t rt = TMath::Sqrt(tc);
689 Double_t pmom = TMath::Sqrt(tc+mom[2]*mom[2]);
690 Double_t tx = mom[0]/pmom;
691 Double_t ty = mom[1]/pmom;
692 Double_t tz = mom[2]/pmom;
693 Double_t s = ((AliMUONChamber*)(*fChambers)[idvol])
696 theta = Float_t(TMath::ATan2(rt,Double_t(mom[2])))*kRaddeg;
697 phi = Float_t(TMath::ATan2(Double_t(mom[1]),Double_t(mom[0])))*kRaddeg;
698 hits[0] = Float_t(ipart); // Geant3 particle type
699 hits[1] = pos[0]+s*tx; // X-position for hit
700 hits[2] = pos[1]+s*ty; // Y-position for hit
701 hits[3] = pos[2]+s*tz; // Z-position for hit
702 hits[4] = theta; // theta angle of incidence
703 hits[5] = phi; // phi angle of incidence
704 hits[8] = 0;//PadHits does not exist anymore (Float_t) fNPadHits; // first padhit
705 hits[9] = -1; // last pad hit
706 hits[10] = mom[3]; // hit momentum P
707 hits[11] = mom[0]; // Px
708 hits[12] = mom[1]; // Py
709 hits[13] = mom[2]; // Pz
710 tof=gMC->TrackTime();
711 hits[14] = tof; // Time of flight
719 Chamber(idvol).ChargeCorrelationInit();
720 // Only if not trigger chamber
722 // printf("---------------------------\n");
723 // printf(">>>> Y = %f \n",hits[2]);
724 // printf("---------------------------\n");
728 // if(idvol < AliMUONConstants::NTrackingCh()) {
730 // // Initialize hit position (cursor) in the segmentation model
731 // ((AliMUONChamber*) (*fChambers)[idvol])
732 // ->SigGenInit(pos[0], pos[1], pos[2]);
734 // //geant3->Gpcxyz();
735 // //printf("In the Trigger Chamber #%d\n",idvol-9);
741 // cout<<sstep<<endl;
744 // Calculate the charge induced on a pad (disintegration) in case
746 // Mip left chamber ...
747 if( gMC->IsTrackExiting() || gMC->IsTrackStop() || gMC->IsTrackDisappeared()){
748 gMC->SetMaxStep(kBig);
754 Float_t globalPos[3] = {pos[0], pos[1], pos[2]};
755 gMC->Gmtod(globalPos,localPos,1);
757 if(idvol < AliMUONConstants::NTrackingCh()) {
759 x0 = 0.5*(xhit+pos[0]);
760 y0 = 0.5*(yhit+pos[1]);
761 z0 = 0.5*(zhit+pos[2]);
770 // if (eloss >0) MakePadHits(x0,y0,z0,eloss,tof,idvol);
773 hits[6] = tlength; // track length
774 hits[7] = eloss2; // de/dx energy loss
777 // if (fNPadHits > (Int_t)hits[8]) {
778 // hits[8] = hits[8]+1;
779 // hits[9] = 0: // PadHits does not exist anymore (Float_t) fNPadHits;
785 AliMUONHit(fIshunt, gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits);
788 // Check additional signal generation conditions
789 // defined by the segmentation
790 // model (boundary crossing conditions)
791 // only for tracking chambers
793 ((idvol < AliMUONConstants::NTrackingCh()) &&
794 ((AliMUONChamber*) (*fChambers)[idvol])->SigGenCond(pos[0], pos[1], pos[2]))
796 ((AliMUONChamber*) (*fChambers)[idvol])
797 ->SigGenInit(pos[0], pos[1], pos[2]);
800 Float_t globalPos[3] = {pos[0], pos[1], pos[2]};
801 gMC->Gmtod(globalPos,localPos,1);
805 // if (eloss > 0 && idvol < AliMUONConstants::NTrackingCh())
806 // MakePadHits(0.5*(xhit+pos[0]),0.5*(yhit+pos[1]),pos[2],eloss,tof,idvol);
813 // nothing special happened, add up energy loss