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 <TGeoMatrix.h>
27 #include <TVirtualMC.h>
29 #include "AliMUONv1.h"
31 #include "AliMUONChamber.h"
32 #include "AliMUONConstants.h"
33 #include "AliMUONFactory.h"
34 #include "AliMUONHit.h"
35 #include "AliMUONTriggerCircuit.h"
36 #include "AliMUONVGeometryBuilder.h"
37 #include "AliMUONChamberGeometry.h"
38 #include "AliMUONGeometryEnvelope.h"
39 #include "AliMUONGeometryConstituent.h"
46 //___________________________________________
47 AliMUONv1::AliMUONv1()
49 fTrackMomentum(), fTrackPosition(),fGlobalTransformation(0)
53 fStepManagerVersionOld = kFALSE;
55 fStepMaxInActiveGas = 0.6;
60 fAngleEffectNorma= 0x0;
62 //___________________________________________
63 AliMUONv1::AliMUONv1(const char *name, const char *title)
64 : AliMUON(name,title), fTrackMomentum(), fTrackPosition()
67 // By default include all stations
68 AliMUONFactory factory;
69 factory.Build(this, title);
71 fStepManagerVersionOld = kFALSE;
73 fStepMaxInActiveGas = 0.6;
75 fStepSum = new Float_t [AliMUONConstants::NCh()];
76 fDestepSum = new Float_t [AliMUONConstants::NCh()];
77 for (Int_t i=0; i<AliMUONConstants::NCh(); i++) {
81 // Ratio of particle mean eloss with respect MIP's Khalil Boudjemline, sep 2003, PhD.Thesis and Particle Data Book
82 fElossRatio = new TF1("ElossRatio","[0]+[1]*x+[2]*x*x+[3]*x*x*x+[4]*x*x*x*x",0.5,5.);
83 fElossRatio->SetParameter(0,1.02138);
84 fElossRatio->SetParameter(1,-9.54149e-02);
85 fElossRatio->SetParameter(2,+7.83433e-02);
86 fElossRatio->SetParameter(3,-9.98208e-03);
87 fElossRatio->SetParameter(4,+3.83279e-04);
89 // Angle effect in tracking chambers at theta =10 degres as a function of ElossRatio (Khalil BOUDJEMLINE sep 2003 Ph.D Thesis) (in micrometers)
90 fAngleEffect10 = new TF1("AngleEffect10","[0]+[1]*x+[2]*x*x",0.5,3.0);
91 fAngleEffect10->SetParameter(0, 1.90691e+02);
92 fAngleEffect10->SetParameter(1,-6.62258e+01);
93 fAngleEffect10->SetParameter(2,+1.28247e+01);
94 // Angle effect: Normalisation form theta=10 degres to theta between 0 and 10 (Khalil BOUDJEMLINE sep 2003 Ph.D Thesis)
95 // Angle with respect to the wires assuming that chambers are perpendicular to the z axis.
96 fAngleEffectNorma = new TF1("AngleEffectNorma","[0]+[1]*x+[2]*x*x+[3]*x*x*x",0.0,10.0);
97 fAngleEffectNorma->SetParameter(0,4.148);
98 fAngleEffectNorma->SetParameter(1,-6.809e-01);
99 fAngleEffectNorma->SetParameter(2,5.151e-02);
100 fAngleEffectNorma->SetParameter(3,-1.490e-03);
102 // Define the global transformation:
103 // Transformation from the old ALICE coordinate system to a new one:
105 TGeoRotation* rotGlobal
106 = new TGeoRotation("rotGlobal", 90., 180., 90., 90., 180., 0.);
107 fGlobalTransformation = new TGeoCombiTrans(0., 0., 0., rotGlobal);
110 //_____________________________________________________________________________
111 AliMUONv1::AliMUONv1(const AliMUONv1& right)
114 // copy constructor (not implemented)
116 Fatal("AliMUONv1", "Copy constructor not provided.");
119 //___________________________________________
120 AliMUONv1::~AliMUONv1()
124 delete fGlobalTransformation;
127 //_____________________________________________________________________________
128 AliMUONv1& AliMUONv1::operator=(const AliMUONv1& right)
130 // assignement operator (not implemented)
132 // check assignement to self
133 if (this == &right) return *this;
135 Fatal("operator =", "Assignement operator not provided.");
140 //__________________________________________________
141 void AliMUONv1::CreateGeometry()
144 // Construct geometry using geometry builders.
147 for (Int_t i=0; i<fGeometryBuilders->GetEntriesFast(); i++) {
150 AliMUONVGeometryBuilder* builder
151 = (AliMUONVGeometryBuilder*)fGeometryBuilders->At(i);
153 // Create geometry with each builder
155 builder->CreateGeometry();
156 builder->SetTransformations();
160 for (Int_t j=0; j<AliMUONConstants::NCh(); j++) {
162 AliMUONChamberGeometry* geometry = Chamber(j).GetGeometry();
164 if (!geometry) continue;
165 // Skip chambers with not defined geometry
167 // Loop over envelopes
168 const TObjArray* kEnvelopes = geometry->GetEnvelopes();
169 for (Int_t k=0; k<kEnvelopes->GetEntriesFast(); k++) {
172 AliMUONGeometryEnvelope* env = (AliMUONGeometryEnvelope*)kEnvelopes->At(k);
173 const TGeoCombiTrans* kEnvTrans = env->GetTransformation();
174 const char* only = "ONLY";
175 if (env->IsMANY()) only = "MANY";
177 if (env->IsVirtual() && env->GetConstituents()->GetEntriesFast() == 0 ) {
178 // virtual envelope + nof constituents = 0
180 // empty virtual envelope has no sense
181 Fatal("CreateGeometry", "Virtual envelope must have constituents.");
185 if (!env->IsVirtual() && env->GetConstituents()->GetEntriesFast() > 0 ) {
186 // non virtual envelope + nof constituents > 0
188 // use VMC to place constituents
189 Fatal("CreateGeometry", "Non virtual envelope cannot have constituents.");
193 if (!env->IsVirtual() && env->GetConstituents()->GetEntriesFast() == 0 ) {
194 // non virtual envelope + nof constituents = 0
195 // => place envelope in ALICE by composed transformation:
196 // Tglobal * Tch * Tenv
198 // Compound chamber transformation with the envelope one
200 = (*fGlobalTransformation) *
201 (*geometry->GetTransformation()) *
203 PlaceVolume(env->GetName(), geometry->GetMotherVolume(),
204 env->GetCopyNo(), total, 0, 0, only);
207 if (env->IsVirtual() && env->GetConstituents()->GetEntriesFast() > 0 ) {
208 // virtual envelope + nof constituents > 0
209 // => do not place envelope and place constituents
210 // in ALICE by composed transformation:
211 // Tglobal * Tch * Tenv * Tconst
213 for (Int_t l=0; l<env->GetConstituents()->GetEntriesFast(); l++) {
214 AliMUONGeometryConstituent* constituent
215 = (AliMUONGeometryConstituent*)env->GetConstituents()->At(l);
217 // Compound chamber transformation with the envelope one + the constituent one
219 = (*fGlobalTransformation) *
220 (*geometry->GetTransformation()) *
222 (*constituent->GetTransformation());
224 PlaceVolume(constituent->GetName(), geometry->GetMotherVolume(),
225 constituent->GetCopyNo(), total,
226 constituent->GetNpar(), constituent->GetParam(), only);
232 //__________________________________________________________________
233 Int_t AliMUONv1::GetChamberId(Int_t volId) const
235 // Check if the volume with specified volId is a sensitive volume (gas)
236 // of some chamber and returns the chamber number;
237 // if not sensitive volume - return 0.
241 for (Int_t i = 1; i <= AliMUONConstants::NCh(); i++)
242 if (volId==((AliMUONChamber*)(*fChambers)[i-1])->GetGid()) return i;
244 for (Int_t i = 1; i <= AliMUONConstants::NCh(); i++)
245 if ( ((AliMUONChamber*)(*fChambers)[i-1])->IsSensId(volId) ) return i;
249 //________________________________________________________________
250 void AliMUONv1::CreateMaterials()
253 // *** DEFINITION OF AVAILABLE MUON MATERIALS ***
255 // Ar-CO2 gas (80%+20%)
256 Float_t ag1[3] = { 39.95,12.01,16. };
257 Float_t zg1[3] = { 18.,6.,8. };
258 Float_t wg1[3] = { .8,.0667,.13333 };
259 Float_t dg1 = .001821;
261 // Ar-buthane-freon gas -- trigger chambers
262 Float_t atr1[4] = { 39.95,12.01,1.01,19. };
263 Float_t ztr1[4] = { 18.,6.,1.,9. };
264 Float_t wtr1[4] = { .56,.1262857,.2857143,.028 };
265 Float_t dtr1 = .002599;
268 Float_t agas[3] = { 39.95,12.01,16. };
269 Float_t zgas[3] = { 18.,6.,8. };
270 Float_t wgas[3] = { .74,.086684,.173316 };
271 Float_t dgas = .0018327;
273 // Ar-Isobutane gas (80%+20%) -- tracking
274 Float_t ag[3] = { 39.95,12.01,1.01 };
275 Float_t zg[3] = { 18.,6.,1. };
276 Float_t wg[3] = { .8,.057,.143 };
277 Float_t dg = .0019596;
279 // Ar-Isobutane-Forane-SF6 gas (49%+7%+40%+4%) -- trigger
280 Float_t atrig[5] = { 39.95,12.01,1.01,19.,32.066 };
281 Float_t ztrig[5] = { 18.,6.,1.,9.,16. };
282 Float_t wtrig[5] = { .49,1.08,1.5,1.84,0.04 };
283 Float_t dtrig = .0031463;
287 Float_t abak[3] = {12.01 , 1.01 , 16.};
288 Float_t zbak[3] = {6. , 1. , 8.};
289 Float_t wbak[3] = {6. , 6. , 1.};
292 Float_t epsil, stmin, deemax, tmaxfd, stemax;
294 Int_t iSXFLD = gAlice->Field()->Integ();
295 Float_t sXMGMX = gAlice->Field()->Max();
297 // --- Define the various materials for GEANT ---
298 AliMaterial(9, "ALUMINIUM$", 26.98, 13., 2.7, 8.9, 37.2);
299 AliMaterial(10, "ALUMINIUM$", 26.98, 13., 2.7, 8.9, 37.2);
300 AliMaterial(15, "AIR$ ", 14.61, 7.3, .001205, 30423.24, 67500);
301 AliMixture(19, "Bakelite$", abak, zbak, dbak, -3, wbak);
302 AliMixture(20, "ArC4H10 GAS$", ag, zg, dg, 3, wg);
303 AliMixture(21, "TRIG GAS$", atrig, ztrig, dtrig, -5, wtrig);
304 AliMixture(22, "ArCO2 80%$", ag1, zg1, dg1, 3, wg1);
305 AliMixture(23, "Ar-freon $", atr1, ztr1, dtr1, 4, wtr1);
306 AliMixture(24, "ArCO2 GAS$", agas, zgas, dgas, 3, wgas);
307 // materials for slat:
308 // Sensitive area: gas (already defined)
310 // insulating material and frame: vetronite
311 // walls: carbon, rohacell, carbon
312 Float_t aglass[5]={12.01, 28.09, 16., 10.8, 23.};
313 Float_t zglass[5]={ 6., 14., 8., 5., 11.};
314 Float_t wglass[5]={ 0.5, 0.105, 0.355, 0.03, 0.01};
317 // rohacell: C9 H13 N1 O2
318 Float_t arohac[4] = {12.01, 1.01, 14.010, 16.};
319 Float_t zrohac[4] = { 6., 1., 7., 8.};
320 Float_t wrohac[4] = { 9., 13., 1., 2.};
321 Float_t drohac = 0.03;
323 AliMaterial(31, "COPPER$", 63.54, 29., 8.96, 1.4, 0.);
324 AliMixture(32, "Vetronite$",aglass, zglass, dglass, 5, wglass);
325 AliMaterial(33, "Carbon$", 12.01, 6., 2.265, 18.8, 49.9);
326 AliMixture(34, "Rohacell$", arohac, zrohac, drohac, -4, wrohac);
329 epsil = .001; // Tracking precision,
330 stemax = -1.; // Maximum displacement for multiple scat
331 tmaxfd = -20.; // Maximum angle due to field deflection
332 deemax = -.3; // Maximum fractional energy loss, DLS
336 AliMedium(1, "AIR_CH_US ", 15, 1, iSXFLD, sXMGMX, tmaxfd, stemax, deemax, epsil, stmin);
340 AliMedium(4, "ALU_CH_US ", 9, 0, iSXFLD, sXMGMX, tmaxfd, fMaxStepAlu,
341 fMaxDestepAlu, epsil, stmin);
342 AliMedium(5, "ALU_CH_US ", 10, 0, iSXFLD, sXMGMX, tmaxfd, fMaxStepAlu,
343 fMaxDestepAlu, epsil, stmin);
347 AliMedium(6, "AR_CH_US ", 20, 1, iSXFLD, sXMGMX, tmaxfd, fMaxStepGas,
348 fMaxDestepGas, epsil, stmin);
350 // Ar-Isobuthane-Forane-SF6 gas
352 AliMedium(7, "GAS_CH_TRIGGER ", 21, 1, iSXFLD, sXMGMX, tmaxfd, stemax, deemax, epsil, stmin);
354 AliMedium(8, "BAKE_CH_TRIGGER ", 19, 0, iSXFLD, sXMGMX, tmaxfd, fMaxStepAlu,
355 fMaxDestepAlu, epsil, stmin);
357 AliMedium(9, "ARG_CO2 ", 22, 1, iSXFLD, sXMGMX, tmaxfd, fMaxStepGas,
358 fMaxDestepAlu, epsil, stmin);
359 // tracking media for slats: check the parameters!!
360 AliMedium(11, "PCB_COPPER ", 31, 0, iSXFLD, sXMGMX, tmaxfd,
361 fMaxStepAlu, fMaxDestepAlu, epsil, stmin);
362 AliMedium(12, "VETRONITE ", 32, 0, iSXFLD, sXMGMX, tmaxfd,
363 fMaxStepAlu, fMaxDestepAlu, epsil, stmin);
364 AliMedium(13, "CARBON ", 33, 0, iSXFLD, sXMGMX, tmaxfd,
365 fMaxStepAlu, fMaxDestepAlu, epsil, stmin);
366 AliMedium(14, "Rohacell ", 34, 0, iSXFLD, sXMGMX, tmaxfd,
367 fMaxStepAlu, fMaxDestepAlu, epsil, stmin);
371 //.Materials specific to stations
372 // created via builders
374 for (Int_t i=0; i<fGeometryBuilders->GetEntriesFast(); i++) {
377 AliMUONVGeometryBuilder* builder
378 = (AliMUONVGeometryBuilder*)fGeometryBuilders->At(i);
380 // Create materials with each builder
381 if (builder) builder->CreateMaterials();
385 //______________________________________________________________________________
386 void AliMUONv1::PlaceVolume(const TString& name, const TString& mName,
387 Int_t copyNo, const TGeoHMatrix& matrix,
388 Int_t npar, Double_t* param, const char* only) const
390 // Place the volume specified by name with the given transformation matrix
393 // Do not apply global transformation
394 // if mother volume == DDIP
395 // (as it is applied on this volume)
396 TGeoHMatrix transform(matrix);
397 if (mName == TString("DDIP")) {
398 transform = (*fGlobalTransformation) * transform;
399 // To be changed to (*fGlobalTransformation).inverse()
400 // when available in TGeo
401 // To make this correct also for a general case when
402 // (*fGlobalTransformation) * *fGlobalTransformation) != 1
405 // Decompose transformation
406 const Double_t* xyz = transform.GetTranslation();
407 const Double_t* rm = transform.GetRotationMatrix();
409 //cout << "Got translation: "
410 // << xyz[0] << " " << xyz[1] << " " << xyz[2] << endl;
412 //cout << "Got rotation: "
413 // << rm[0] << " " << rm[1] << " " << rm[2] << endl
414 // << rm[3] << " " << rm[4] << " " << rm[5] << endl
415 // << rm[6] << " " << rm[7] << " " << rm[8] << endl;
417 // Check for presence of rotation
418 // (will be nice to be available in TGeo)
419 const Double_t kTolerance = 1e-04;
420 Bool_t isRotation = true;
421 if (TMath::Abs(rm[0] - 1.) < kTolerance &&
422 TMath::Abs(rm[1] - 0.) < kTolerance &&
423 TMath::Abs(rm[2] - 0.) < kTolerance &&
424 TMath::Abs(rm[3] - 0.) < kTolerance &&
425 TMath::Abs(rm[4] - 1.) < kTolerance &&
426 TMath::Abs(rm[5] - 0.) < kTolerance &&
427 TMath::Abs(rm[6] - 0.) < kTolerance &&
428 TMath::Abs(rm[7] - 0.) < kTolerance &&
429 TMath::Abs(rm[8] - 1.) < kTolerance) isRotation = false;
434 rot.SetMatrix(const_cast<Double_t*>(transform.GetRotationMatrix()));
435 Double_t theta1, phi1, theta2, phi2, theta3, phi3;
436 rot.GetAngles(theta1, phi1, theta2, phi2, theta3, phi3);
439 // << theta1 << " " << phi1 << " "
440 // << theta2 << " " << phi2 << " "
441 // << theta3 << " " << phi3 << endl;
443 AliMatrix(krot, theta1, phi1, theta2, phi2, theta3, phi3);
446 // Place the volume in ALIC
448 gMC->Gspos(name, copyNo, mName, xyz[0], xyz[1], xyz[2] , krot, only);
450 gMC->Gsposp(name, copyNo, mName, xyz[0], xyz[1], xyz[2] , krot, only,
455 //___________________________________________
456 void AliMUONv1::Init()
459 // Initialize Tracking Chambers
462 if(fDebug) printf("\n%s: Start Init for version 1 - CPC chamber type\n\n",ClassName());
464 for (i=0; i<AliMUONConstants::NCh(); i++) {
465 ( (AliMUONChamber*) (*fChambers)[i])->Init();
469 // Set the chamber (sensitive region) GEANT identifier
471 for (Int_t i=0; i<fGeometryBuilders->GetEntriesFast(); i++) {
474 AliMUONVGeometryBuilder* builder
475 = (AliMUONVGeometryBuilder*)fGeometryBuilders->At(i);
477 // Set sesitive volumes with each builder
478 if (builder) builder->SetSensitiveVolumes();
483 // Set the chamber (sensitive region) GEANT identifier
484 ((AliMUONChamber*)(*fChambers)[0])->SetGid(gMC->VolId("S01G"));
485 ((AliMUONChamber*)(*fChambers)[1])->SetGid(gMC->VolId("S02G"));
487 ((AliMUONChamber*)(*fChambers)[2])->SetGid(gMC->VolId("S03G"));
488 ((AliMUONChamber*)(*fChambers)[3])->SetGid(gMC->VolId("S04G"));
490 ((AliMUONChamber*)(*fChambers)[4])->SetGid(gMC->VolId("S05G"));
491 ((AliMUONChamber*)(*fChambers)[5])->SetGid(gMC->VolId("S06G"));
493 ((AliMUONChamber*)(*fChambers)[6])->SetGid(gMC->VolId("S07G"));
494 ((AliMUONChamber*)(*fChambers)[7])->SetGid(gMC->VolId("S08G"));
496 ((AliMUONChamber*)(*fChambers)[8])->SetGid(gMC->VolId("S09G"));
497 ((AliMUONChamber*)(*fChambers)[9])->SetGid(gMC->VolId("S10G"));
499 ((AliMUONChamber*)(*fChambers)[10])->SetGid(gMC->VolId("SG1A"));
500 ((AliMUONChamber*)(*fChambers)[11])->SetGid(gMC->VolId("SG2A"));
501 ((AliMUONChamber*)(*fChambers)[12])->SetGid(gMC->VolId("SG3A"));
502 ((AliMUONChamber*)(*fChambers)[13])->SetGid(gMC->VolId("SG4A"));
504 if(fDebug) printf("\n%s: Finished Init for version 1 - CPC chamber type\n",ClassName());
507 if(fDebug) printf("\n%s: Start Init for Trigger Circuits\n",ClassName());
508 for (i=0; i<AliMUONConstants::NTriggerCircuit(); i++) {
509 ( (AliMUONTriggerCircuit*) (*fTriggerCircuits)[i])->Init(i);
511 if(fDebug) printf("%s: Finished Init for Trigger Circuits\n",ClassName());
515 //_______________________________________________________________________________
516 void AliMUONv1::StepManager()
518 // Stepmanager for the chambers
520 if (fStepManagerVersionOld) {
525 // Only charged tracks
526 if( !(gMC->TrackCharge()) ) return;
527 // Only charged tracks
529 // Only gas gap inside chamber
530 // Tag chambers and record hits when track enters
531 static Int_t idvol=-1;
535 const Float_t kBig = 1.e10;
539 // Only gas gap inside chamber
540 // Tag chambers and record hits when track enters
541 id=gMC->CurrentVolID(copy);
542 iChamber = GetChamberId(id);
545 if (idvol == -1) return;
547 // Filling TrackRefs file for MUON. Our Track references are the active volume of the chambers
548 if ( (gMC->IsTrackEntering() || gMC->IsTrackExiting() ) )
549 AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber());
551 if( gMC->IsTrackEntering() ) {
552 Float_t theta = fTrackMomentum.Theta();
553 if ((TMath::Pi()-theta)*kRaddeg>=15.) gMC->SetMaxStep(fStepMaxInActiveGas); // We use Pi-theta because z is negative
557 // Float_t z = ( (AliMUONChamber*)(*fChambers)[idvol])->Z() ;
558 // Info("StepManager Step","Active volume found %d chamber %d Z chamber is %f ",idvol,iChamber, z);
560 // Particule id and mass,
561 Int_t ipart = gMC->TrackPid();
562 Float_t mass = gMC->TrackMass();
564 fDestepSum[idvol]+=gMC->Edep();
565 // Get current particle id (ipart), track position (pos) and momentum (mom)
566 if ( fStepSum[idvol]==0.0 ) gMC->TrackMomentum(fTrackMomentum);
567 fStepSum[idvol]+=gMC->TrackStep();
570 // Info("StepManager Step","iChamber %d, Particle %d, theta %f phi %f mass %f StepSum %f eloss %g",
571 // iChamber,ipart, fTrackMomentum.Theta()*kRaddeg, fTrackMomentum.Phi()*kRaddeg, mass, fStepSum[idvol], gMC->Edep());
572 // Info("StepManager Step","Track Momentum %f %f %f", fTrackMomentum.X(), fTrackMomentum.Y(), fTrackMomentum.Z()) ;
573 // gMC->TrackPosition(fTrackPosition);
574 // Info("StepManager Step","Track Position %f %f %f",fTrackPosition.X(),fTrackPosition.Y(),fTrackPosition.Z()) ;
577 // Track left chamber or StepSum larger than fStepMaxInActiveGas
578 if ( gMC->IsTrackExiting() ||
579 gMC->IsTrackStop() ||
580 gMC->IsTrackDisappeared()||
581 (fStepSum[idvol]>fStepMaxInActiveGas) ) {
583 if ( gMC->IsTrackExiting() ||
584 gMC->IsTrackStop() ||
585 gMC->IsTrackDisappeared() ) gMC->SetMaxStep(kBig);
587 gMC->TrackPosition(fTrackPosition);
588 Float_t theta = fTrackMomentum.Theta();
589 Float_t phi = fTrackMomentum.Phi();
591 TLorentzVector backToWire( fStepSum[idvol]/2.*sin(theta)*cos(phi),
592 fStepSum[idvol]/2.*sin(theta)*sin(phi),
593 fStepSum[idvol]/2.*cos(theta),0.0 );
595 // Info("StepManager Exit","Track Position %f %f %f",fTrackPosition.X(),fTrackPosition.Y(),fTrackPosition.Z()) ;
597 // Info("StepManager Exit ","Track backToWire %f %f %f",backToWire.X(),backToWire.Y(),backToWire.Z()) ;
598 fTrackPosition-=backToWire;
600 //-------------- Angle effect
601 // Ratio between energy loss of particle and Mip as a function of BetaGamma of particle (Energy/Mass)
603 Float_t betaxGamma = fTrackMomentum.P()/mass;// pc/mc2
604 Float_t sigmaEffect10degrees;
605 Float_t sigmaEffectThetadegrees;
606 Float_t eLossParticleELossMip;
607 Float_t yAngleEffect=0.;
608 Float_t thetawires = TMath::Abs( TMath::ASin( TMath::Sin(TMath::Pi()-theta) * TMath::Sin(phi) ) );// We use Pi-theta because z is negative
612 if ( (betaxGamma >3.2) && (thetawires*kRaddeg<=15.) ) {
613 betaxGamma=TMath::Log(betaxGamma);
614 eLossParticleELossMip = fElossRatio->Eval(betaxGamma);
615 // 10 degrees is a reference for a model (arbitrary)
616 sigmaEffect10degrees=fAngleEffect10->Eval(eLossParticleELossMip);// in micrometers
617 // Angle with respect to the wires assuming that chambers are perpendicular to the z axis.
618 sigmaEffectThetadegrees = sigmaEffect10degrees/fAngleEffectNorma->Eval(thetawires*kRaddeg); // For 5mm gap
619 if ( (iChamber==1) || (iChamber==2) )
620 sigmaEffectThetadegrees/=(1.09833e+00+1.70000e-02*(thetawires*kRaddeg)); // The gap is different (4mm)
621 yAngleEffect=1.e-04*gRandom->Gaus(0,sigmaEffectThetadegrees); // Error due to the angle effect in cm
625 // One hit per chamber
626 GetMUONData()->AddHit(fIshunt, gAlice->GetMCApp()->GetCurrentTrackNumber(), iChamber, ipart,
627 fTrackPosition.X(), fTrackPosition.Y()+yAngleEffect, fTrackPosition.Z(), 0.0,
628 fTrackMomentum.P(),theta, phi, fStepSum[idvol], fDestepSum[idvol],
629 fTrackPosition.X(),fTrackPosition.Y(),fTrackPosition.Z());
631 // Info("StepManager Exit","Particle exiting from chamber %d",iChamber);
632 // Info("StepManager Exit","StepSum %f eloss geant %g ",fStepSum[idvol],fDestepSum[idvol]);
633 // Info("StepManager Exit","Track Position %f %f %f",fTrackPosition.X(),fTrackPosition.Y(),fTrackPosition.Z()) ;
635 fStepSum[idvol] =0; // Reset for the next event
636 fDestepSum[idvol]=0; // Reset for the next event
640 //__________________________________________
641 void AliMUONv1::StepManagerOld()
643 // Old Stepmanager for the chambers
645 static Int_t idvol =-1;
651 Float_t destep, step;
653 static Float_t sstep;
654 static Float_t eloss, eloss2, xhit, yhit, zhit, tof, tlength;
655 const Float_t kBig = 1.e10;
656 static Float_t hits[15];
658 TClonesArray &lhits = *fHits;
662 // Only charged tracks
663 if( !(gMC->TrackCharge()) ) return;
665 // Only gas gap inside chamber
666 // Tag chambers and record hits when track enters
667 id=gMC->CurrentVolID(copy);
668 vol[0] = GetChamberId(id);
671 if (idvol == -1) return;
674 // Get current particle id (ipart), track position (pos) and momentum (mom)
675 gMC->TrackPosition(pos);
676 gMC->TrackMomentum(mom);
678 ipart = gMC->TrackPid();
681 // momentum loss and steplength in last step
682 destep = gMC->Edep();
683 step = gMC->TrackStep();
684 // cout<<"------------"<<step<<endl;
686 // record hits when track enters ...
687 if( gMC->IsTrackEntering()) {
689 gMC->SetMaxStep(fMaxStepGas);
690 Double_t tc = mom[0]*mom[0]+mom[1]*mom[1];
691 Double_t rt = TMath::Sqrt(tc);
692 Double_t pmom = TMath::Sqrt(tc+mom[2]*mom[2]);
693 Double_t tx = mom[0]/pmom;
694 Double_t ty = mom[1]/pmom;
695 Double_t tz = mom[2]/pmom;
696 Double_t s = ((AliMUONChamber*)(*fChambers)[idvol])
699 theta = Float_t(TMath::ATan2(rt,Double_t(mom[2])))*kRaddeg;
700 phi = Float_t(TMath::ATan2(Double_t(mom[1]),Double_t(mom[0])))*kRaddeg;
701 hits[0] = Float_t(ipart); // Geant3 particle type
702 hits[1] = pos[0]+s*tx; // X-position for hit
703 hits[2] = pos[1]+s*ty; // Y-position for hit
704 hits[3] = pos[2]+s*tz; // Z-position for hit
705 hits[4] = theta; // theta angle of incidence
706 hits[5] = phi; // phi angle of incidence
707 hits[8] = 0;//PadHits does not exist anymore (Float_t) fNPadHits; // first padhit
708 hits[9] = -1; // last pad hit
709 hits[10] = mom[3]; // hit momentum P
710 hits[11] = mom[0]; // Px
711 hits[12] = mom[1]; // Py
712 hits[13] = mom[2]; // Pz
713 tof=gMC->TrackTime();
714 hits[14] = tof; // Time of flight
722 Chamber(idvol).ChargeCorrelationInit();
723 // Only if not trigger chamber
725 // printf("---------------------------\n");
726 // printf(">>>> Y = %f \n",hits[2]);
727 // printf("---------------------------\n");
731 // if(idvol < AliMUONConstants::NTrackingCh()) {
733 // // Initialize hit position (cursor) in the segmentation model
734 // ((AliMUONChamber*) (*fChambers)[idvol])
735 // ->SigGenInit(pos[0], pos[1], pos[2]);
737 // //geant3->Gpcxyz();
738 // //printf("In the Trigger Chamber #%d\n",idvol-9);
744 // cout<<sstep<<endl;
747 // Calculate the charge induced on a pad (disintegration) in case
749 // Mip left chamber ...
750 if( gMC->IsTrackExiting() || gMC->IsTrackStop() || gMC->IsTrackDisappeared()){
751 gMC->SetMaxStep(kBig);
757 Float_t globalPos[3] = {pos[0], pos[1], pos[2]};
758 gMC->Gmtod(globalPos,localPos,1);
760 if(idvol < AliMUONConstants::NTrackingCh()) {
762 x0 = 0.5*(xhit+pos[0]);
763 y0 = 0.5*(yhit+pos[1]);
764 z0 = 0.5*(zhit+pos[2]);
773 // if (eloss >0) MakePadHits(x0,y0,z0,eloss,tof,idvol);
776 hits[6] = tlength; // track length
777 hits[7] = eloss2; // de/dx energy loss
780 // if (fNPadHits > (Int_t)hits[8]) {
781 // hits[8] = hits[8]+1;
782 // hits[9] = 0: // PadHits does not exist anymore (Float_t) fNPadHits;
788 AliMUONHit(fIshunt, gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits);
791 // Check additional signal generation conditions
792 // defined by the segmentation
793 // model (boundary crossing conditions)
794 // only for tracking chambers
796 ((idvol < AliMUONConstants::NTrackingCh()) &&
797 ((AliMUONChamber*) (*fChambers)[idvol])->SigGenCond(pos[0], pos[1], pos[2]))
799 ((AliMUONChamber*) (*fChambers)[idvol])
800 ->SigGenInit(pos[0], pos[1], pos[2]);
803 Float_t globalPos[3] = {pos[0], pos[1], pos[2]};
804 gMC->Gmtod(globalPos,localPos,1);
808 // if (eloss > 0 && idvol < AliMUONConstants::NTrackingCh())
809 // MakePadHits(0.5*(xhit+pos[0]),0.5*(yhit+pos[1]),pos[2],eloss,tof,idvol);
816 // nothing special happened, add up energy loss