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1 | /************************************************************************** | |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
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 * | |
12 | * about the suitability of this software for any purpeateose. It is * | |
13 | * provided "as is" without express or implied warranty. * | |
14 | **************************************************************************/ | |
15 | ||
16 | /* $Id$ */ | |
17 | ||
18 | //----------------------------------------------------------------------------- | |
19 | // Class AliMUONv1 | |
20 | // -------------------- | |
21 | // AliDetector class for MUON subsystem which implements | |
22 | // functions for simulation | |
23 | //----------------------------------------------------------------------------- | |
24 | ||
25 | #include "AliMUONv1.h" | |
26 | #include "AliMUONConstants.h" | |
27 | #include "AliMUONResponseFactory.h" | |
28 | #include "AliMUONHit.h" | |
29 | #include "AliMUONGeometryBuilder.h" | |
30 | #include "AliMUONGeometry.h" | |
31 | #include "AliMUONGeometryTransformer.h" | |
32 | #include "AliMUONGeometryModule.h" | |
33 | #include "AliMUONStringIntMap.h" | |
34 | #include "AliMUONGeometryDetElement.h" | |
35 | ||
36 | #include "AliMpCDB.h" | |
37 | #include "AliMpDEManager.h" | |
38 | ||
39 | #include "AliConst.h" | |
40 | #include "AliMagF.h" | |
41 | #include "AliRun.h" | |
42 | #include "AliMC.h" | |
43 | #include "AliTrackReference.h" | |
44 | #include "AliLog.h" | |
45 | ||
46 | #include <TRandom.h> | |
47 | #include <TF1.h> | |
48 | #include <TClonesArray.h> | |
49 | #include <TRandom.h> | |
50 | #include <TVirtualMC.h> | |
51 | #include <TGeoMatrix.h> | |
52 | ||
53 | #include <string> | |
54 | ||
55 | #include "AliMUONVHitStore.h" | |
56 | ||
57 | /// \cond CLASSIMP | |
58 | ClassImp(AliMUONv1) | |
59 | /// \endcond | |
60 | ||
61 | //___________________________________________ | |
62 | AliMUONv1::AliMUONv1() | |
63 | : AliMUON(), | |
64 | fAngleEffect(kTRUE), | |
65 | fStepMaxInActiveGas(0.6), | |
66 | fStepSum(0x0), | |
67 | fDestepSum(0x0), | |
68 | fTrackMomentum(), | |
69 | fTrackPosition(), | |
70 | fElossRatio(0x0), | |
71 | fAngleEffect10(0x0), | |
72 | fAngleEffectNorma(0x0) | |
73 | { | |
74 | /// Default constructor | |
75 | ||
76 | AliDebug(1,Form("default (empty) ctor this=%p",this)); | |
77 | } | |
78 | ||
79 | //___________________________________________ | |
80 | AliMUONv1::AliMUONv1(const char *name, const char* title) | |
81 | : AliMUON(name, title), | |
82 | fAngleEffect(kTRUE), | |
83 | fStepMaxInActiveGas(0.6), | |
84 | fStepSum(0x0), | |
85 | fDestepSum(0x0), | |
86 | fTrackMomentum(), | |
87 | fTrackPosition(), | |
88 | fElossRatio(0x0), | |
89 | fAngleEffect10(0x0), | |
90 | fAngleEffectNorma(0x0) | |
91 | { | |
92 | /// Standard onstructor | |
93 | ||
94 | AliDebug(1,Form("ctor this=%p",this)); | |
95 | ||
96 | // Load mapping | |
97 | if ( ! AliMpCDB::LoadMpSegmentation() ) { | |
98 | AliFatal("Could not access mapping from OCDB !"); | |
99 | } | |
100 | ||
101 | // By default include all stations | |
102 | ||
103 | fStepSum = new Float_t [AliMUONConstants::NCh()]; | |
104 | fDestepSum = new Float_t [AliMUONConstants::NCh()]; | |
105 | for (Int_t i=0; i<AliMUONConstants::NCh(); i++) { | |
106 | fStepSum[i] =0.0; | |
107 | fDestepSum[i]=0.0; | |
108 | } | |
109 | // Ratio of particle mean eloss with respect MIP's Khalil Boudjemline, sep 2003, PhD.Thesis and Particle Data Book | |
110 | fElossRatio = new TF1("ElossRatio","[0]+[1]*x+[2]*x*x+[3]*x*x*x+[4]*x*x*x*x",0.5,5.); | |
111 | fElossRatio->SetParameter(0,1.02138); | |
112 | fElossRatio->SetParameter(1,-9.54149e-02); | |
113 | fElossRatio->SetParameter(2,+7.83433e-02); | |
114 | fElossRatio->SetParameter(3,-9.98208e-03); | |
115 | fElossRatio->SetParameter(4,+3.83279e-04); | |
116 | ||
117 | // Angle effect in tracking chambers at theta =10 degres as a function of ElossRatio (Khalil BOUDJEMLINE sep 2003 Ph.D Thesis) (in micrometers) | |
118 | fAngleEffect10 = new TF1("AngleEffect10","[0]+[1]*x+[2]*x*x",0.5,3.0); | |
119 | fAngleEffect10->SetParameter(0, 1.90691e+02); | |
120 | fAngleEffect10->SetParameter(1,-6.62258e+01); | |
121 | fAngleEffect10->SetParameter(2,+1.28247e+01); | |
122 | // Angle effect: Normalisation form theta=10 degres to theta between 0 and 10 (Khalil BOUDJEMLINE sep 2003 Ph.D Thesis) | |
123 | // Angle with respect to the wires assuming that chambers are perpendicular to the z axis. | |
124 | fAngleEffectNorma = new TF1("AngleEffectNorma","[0]+[1]*x+[2]*x*x+[3]*x*x*x",0.0,10.0); | |
125 | fAngleEffectNorma->SetParameter(0,4.148); | |
126 | fAngleEffectNorma->SetParameter(1,-6.809e-01); | |
127 | fAngleEffectNorma->SetParameter(2,5.151e-02); | |
128 | fAngleEffectNorma->SetParameter(3,-1.490e-03); | |
129 | } | |
130 | ||
131 | //___________________________________________ | |
132 | AliMUONv1::~AliMUONv1() | |
133 | { | |
134 | /// Destructor | |
135 | ||
136 | AliDebug(1,Form("dtor this=%p",this)); | |
137 | delete [] fStepSum; | |
138 | delete [] fDestepSum; | |
139 | delete fElossRatio; | |
140 | delete fAngleEffect10; | |
141 | delete fAngleEffectNorma; | |
142 | } | |
143 | ||
144 | //__________________________________________________ | |
145 | void AliMUONv1::CreateGeometry() | |
146 | { | |
147 | /// Construct geometry using geometry builder | |
148 | ||
149 | fGeometryBuilder->CreateGeometry(); | |
150 | } | |
151 | ||
152 | //________________________________________________________________ | |
153 | void AliMUONv1::CreateMaterials() | |
154 | { | |
155 | /// Construct materials using geometry builder | |
156 | ||
157 | fGeometryBuilder->CreateMaterials(); | |
158 | } | |
159 | ||
160 | //________________________________________________________________ | |
161 | void AliMUONv1::AddAlignableVolumes() const | |
162 | { | |
163 | /// Construct materials using geometry builder | |
164 | ||
165 | GetGeometryTransformer()->AddAlignableVolumes(); | |
166 | } | |
167 | ||
168 | ||
169 | //___________________________________________ | |
170 | void AliMUONv1::Init() | |
171 | { | |
172 | /// Initialize geometry | |
173 | ||
174 | AliDebug(1,"Start Init for version 1 - CPC chamber type"); | |
175 | ||
176 | fGeometryBuilder->InitGeometry(); | |
177 | AliDebug(1,"Finished Init for version 1 - CPC chamber type"); | |
178 | ||
179 | ||
180 | // Build segmentation | |
181 | // using geometry parametrisation | |
182 | // | |
183 | // Build response | |
184 | // | |
185 | AliMUONResponseFactory respFactory("default", fIsTailEffect); | |
186 | respFactory.Build(this); | |
187 | ||
188 | } | |
189 | ||
190 | //__________________________________________________________________ | |
191 | Int_t AliMUONv1::GetGeomModuleId(Int_t volId) const | |
192 | { | |
193 | /// Check if the volume with specified volId is a sensitive volume (gas) | |
194 | /// of some chamber and return the chamber number; | |
195 | /// if not sensitive volume - return 0. | |
196 | ||
197 | for (Int_t i = 0; i < AliMUONConstants::NGeomModules(); i++) { | |
198 | if ( GetGeometry()->GetModule(i)->IsSensitiveVolume(volId) ) | |
199 | return i; | |
200 | } | |
201 | ||
202 | return -1; | |
203 | } | |
204 | ||
205 | //_______________________________________________________________________________ | |
206 | TString AliMUONv1::CurrentVolumePath() const | |
207 | { | |
208 | /// Return current volume path | |
209 | /// (Could be removed when this function is available via gMC) | |
210 | ||
211 | TString path = ""; | |
212 | TString name; | |
213 | Int_t copyNo; | |
214 | Int_t imother = 0; | |
215 | do { | |
216 | name = gMC->CurrentVolOffName(imother); | |
217 | gMC->CurrentVolOffID(imother++, copyNo); | |
218 | TString add = "/"; | |
219 | add += name; | |
220 | add += "_"; | |
221 | add += copyNo; | |
222 | path.Insert(0,add); | |
223 | } | |
224 | while ( name != TString("ALIC") ); | |
225 | ||
226 | return path; | |
227 | } | |
228 | ||
229 | //_______________________________________________________________________________ | |
230 | void AliMUONv1::StepManager() | |
231 | { | |
232 | /// Step manager for the chambers | |
233 | ||
234 | // Only charged tracks | |
235 | if( !(gMC->TrackCharge()) ) return; | |
236 | // Only charged tracks | |
237 | ||
238 | // Only gas gap inside chamber | |
239 | // Tag chambers and record hits when track enters | |
240 | static Int_t idvol=-1, iEnter = 0; | |
241 | Int_t copy; | |
242 | const Float_t kBig = 1.e10; | |
243 | static Double_t xyzEnter[3]; | |
244 | ||
245 | // | |
246 | // Only gas gap inside chamber | |
247 | // Tag chambers and record hits when track enters | |
248 | Int_t id=gMC->CurrentVolID(copy); | |
249 | Int_t iGeomModule = GetGeomModuleId(id); | |
250 | if (iGeomModule == -1) return; | |
251 | ||
252 | // Detection elements id | |
253 | const AliMUONGeometryModule* kGeometryModule | |
254 | = GetGeometry()->GetModule(iGeomModule); | |
255 | AliMUONGeometryDetElement* detElement | |
256 | = kGeometryModule->FindBySensitiveVolume(CurrentVolumePath()); | |
257 | ||
258 | if (!detElement && iGeomModule < AliMUONConstants::NGeomModules()-2) { | |
259 | iGeomModule++; | |
260 | const AliMUONGeometryModule* kGeometryModule2 | |
261 | = GetGeometry()->GetModule(iGeomModule); | |
262 | detElement | |
263 | = kGeometryModule2->FindBySensitiveVolume(CurrentVolumePath()); | |
264 | } | |
265 | ||
266 | Int_t detElemId = 0; | |
267 | if (detElement) detElemId = detElement->GetUniqueID(); | |
268 | ||
269 | if (!detElemId) { | |
270 | AliErrorStream() | |
271 | << "Geometry module id: " | |
272 | << setw(3) << iGeomModule << " " | |
273 | << "Current SV: " | |
274 | << CurrentVolumePath() | |
275 | << " detElemId: " | |
276 | << setw(5) << detElemId | |
277 | << endl; | |
278 | Double_t x, y, z; | |
279 | gMC->TrackPosition(x, y, z); | |
280 | AliErrorStream() | |
281 | << " global position: " | |
282 | << x << ", " << y << ", " << z | |
283 | << endl; | |
284 | AliErrorStream() << "DetElemId not identified." << endl; | |
285 | } | |
286 | ||
287 | Int_t iChamber = AliMpDEManager::GetChamberId(detElemId) + 1; | |
288 | idvol = iChamber -1; | |
289 | ||
290 | // Filling TrackRefs file for MUON. Our Track references are the active volume of the chambers | |
291 | if ( (gMC->IsTrackEntering() || gMC->IsTrackExiting() ) ) { | |
292 | AliTrackReference* trackReference | |
293 | = AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber(), AliTrackReference::kMUON); | |
294 | trackReference->SetUserId(detElemId); | |
295 | } | |
296 | ||
297 | if( gMC->IsTrackEntering() ) { | |
298 | Float_t theta = fTrackMomentum.Theta(); | |
299 | if ((TMath::Pi()-theta)*kRaddeg>=15.) gMC->SetMaxStep(fStepMaxInActiveGas); // We use Pi-theta because z is negative | |
300 | iEnter = 1; | |
301 | gMC->TrackPosition(xyzEnter[0], xyzEnter[1], xyzEnter[2]); // save coordinates of entrance point | |
302 | } | |
303 | ||
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, | |
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(); | |
315 | ||
316 | // if (AliDebugLevel()) { | |
317 | // AliDebug(1,Form("Step, iChamber %d, Particle %d, theta %f phi %f mass %f StepSum %f eloss %g", | |
318 | // iChamber,ipart, fTrackMomentum.Theta()*kRaddeg, fTrackMomentum.Phi()*kRaddeg, | |
319 | // mass, fStepSum[idvol], gMC->Edep())); | |
320 | // AliDebug(1,Form("Step:Track Momentum %f %f %f", fTrackMomentum.X(), fTrackMomentum.Y(), | |
321 | // fTrackMomentum.Z())); | |
322 | // gMC->TrackPosition(fTrackPosition); | |
323 | // AliDebug(1,Form("Step: Track Position %f %f %f",fTrackPosition.X(), | |
324 | // fTrackPosition.Y(),fTrackPosition.Z())) ; | |
325 | //} | |
326 | ||
327 | // Track left chamber or StepSum larger than fStepMaxInActiveGas | |
328 | if ( gMC->IsTrackExiting() || | |
329 | gMC->IsTrackStop() || | |
330 | gMC->IsTrackDisappeared()|| | |
331 | (fStepSum[idvol]>fStepMaxInActiveGas) ) { | |
332 | ||
333 | if ( gMC->IsTrackExiting() || | |
334 | gMC->IsTrackStop() || | |
335 | gMC->IsTrackDisappeared() ) gMC->SetMaxStep(kBig); | |
336 | if (fDestepSum[idvol] == 0) { | |
337 | // AZ - no energy release | |
338 | fStepSum[idvol] = 0; // Reset for the next event | |
339 | iEnter = 0; | |
340 | return; | |
341 | } | |
342 | ||
343 | gMC->TrackPosition(fTrackPosition); | |
344 | Float_t theta = fTrackMomentum.Theta(); | |
345 | Float_t phi = fTrackMomentum.Phi(); | |
346 | ||
347 | Int_t merge = 0; | |
348 | Double_t xyz0[3]={0}, xyz1[3]={0}, tmp[3]={0}; | |
349 | if (gMC->IsTrackExiting() && iEnter != 0) { | |
350 | // AZ - this code is to avoid artificial hit splitting at the | |
351 | // "fake" boundary inside the same chamber. It will still produce | |
352 | // 2 hits but with the same coordinates (at the wire) to allow | |
353 | // their merging at the digitization level. | |
354 | ||
355 | // Only for a track going from the entrance to the exit from the volume | |
356 | // Get local coordinates | |
357 | gMC->Gmtod(xyzEnter, xyz0, 1); // local coord. at the entrance | |
358 | ||
359 | fTrackPosition.Vect().GetXYZ(tmp); | |
360 | gMC->Gmtod(tmp, xyz1, 1); // local coord. at the exit | |
361 | Float_t dx = xyz0[0] - xyz1[0]; | |
362 | Float_t dy = xyz0[1] - xyz1[1]; | |
363 | Float_t thLoc = TMath::ATan2 (TMath::Sqrt(dx*dx+dy*dy), TMath::Abs(xyz0[2]-xyz1[2])); | |
364 | if (thLoc * TMath::RadToDeg() < 15) merge = 1; | |
365 | } | |
366 | ||
367 | if (merge) { | |
368 | Double_t dz = -0.5; | |
369 | if (xyz1[2] != xyz0[2]) dz = xyz0[2] / (xyz1[2] - xyz0[2]); | |
370 | tmp[0] = xyz0[0] - (xyz1[0] - xyz0[0]) * dz; // local coord. at the wire | |
371 | tmp[1] = xyz0[1] - (xyz1[1] - xyz0[1]) * dz; | |
372 | tmp[2] = xyz0[2] - (xyz1[2] - xyz0[2]) * dz; | |
373 | gMC->Gdtom(tmp, xyz1, 1); // global coord. at the wire | |
374 | fTrackPosition.SetXYZT(xyz1[0], xyz1[1], xyz1[2], fTrackPosition.T()); | |
375 | } else { | |
376 | TLorentzVector backToWire( fStepSum[idvol]/2.*sin(theta)*cos(phi), | |
377 | fStepSum[idvol]/2.*sin(theta)*sin(phi), | |
378 | fStepSum[idvol]/2.*cos(theta),0.0 ); | |
379 | fTrackPosition-=backToWire; | |
380 | //printf(" %d %d %d %f %d \n", gMC->IsTrackExiting(), gMC->IsTrackStop(), gMC->IsTrackDisappeared(), fStepSum[idvol], iEnter); | |
381 | // AliDebug(1, | |
382 | // Form("Track Position %f %f %f",fTrackPosition.X(),fTrackPosition.Y(),fTrackPosition.Z())); | |
383 | // AliDebug(1, | |
384 | // Form("Exit: Track backToWire %f %f %f",backToWire.X(),backToWire.Y(),backToWire.Z())) ; | |
385 | } | |
386 | ||
387 | //-------------- Angle effect | |
388 | // Ratio between energy loss of particle and Mip as a function of BetaGamma of particle (Energy/Mass) | |
389 | ||
390 | Float_t betaxGamma = fTrackMomentum.P()/mass;// pc/mc2 | |
391 | Float_t sigmaEffect10degrees; | |
392 | Float_t sigmaEffectThetadegrees; | |
393 | Float_t eLossParticleELossMip; | |
394 | Float_t yAngleEffect=0.; | |
395 | Float_t thetawires = TMath::Abs( TMath::ASin( TMath::Sin(TMath::Pi()-theta) * TMath::Sin(phi) ) );// We use Pi-theta because z is negative | |
396 | ||
397 | ||
398 | if (fAngleEffect){ | |
399 | if ( (betaxGamma >3.2) && (thetawires*kRaddeg<=15.) ) { | |
400 | betaxGamma=TMath::Log(betaxGamma); | |
401 | eLossParticleELossMip = fElossRatio->Eval(betaxGamma); | |
402 | // 10 degrees is a reference for a model (arbitrary) | |
403 | sigmaEffect10degrees=fAngleEffect10->Eval(eLossParticleELossMip);// in micrometers | |
404 | // Angle with respect to the wires assuming that chambers are perpendicular to the z axis. | |
405 | sigmaEffectThetadegrees = sigmaEffect10degrees/fAngleEffectNorma->Eval(thetawires*kRaddeg); // For 5mm gap | |
406 | if ( (iChamber==1) || (iChamber==2) ) | |
407 | sigmaEffectThetadegrees/=(1.09833e+00+1.70000e-02*(thetawires*kRaddeg)); // The gap is different (4mm) | |
408 | yAngleEffect=1.e-04*gRandom->Gaus(0,sigmaEffectThetadegrees); // Error due to the angle effect in cm | |
409 | } | |
410 | } | |
411 | ||
412 | AliMUONHit hit(fIshunt, | |
413 | gAlice->GetMCApp()->GetCurrentTrackNumber(), | |
414 | detElemId, ipart, | |
415 | fTrackPosition.X(), | |
416 | fTrackPosition.Y()+yAngleEffect, | |
417 | fTrackPosition.Z(), | |
418 | gMC->TrackTime(), | |
419 | fTrackMomentum.P(), | |
420 | theta, | |
421 | phi, | |
422 | fStepSum[idvol], | |
423 | fDestepSum[idvol], | |
424 | fTrackPosition.X(), | |
425 | fTrackPosition.Y(), | |
426 | fTrackPosition.Z()); | |
427 | ||
428 | fHitStore->Add(hit); | |
429 | ||
430 | fStepSum[idvol] =0; // Reset for the next event | |
431 | fDestepSum[idvol]=0; // Reset for the next event | |
432 | iEnter = 0; | |
433 | } | |
434 | } |