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a9e2aefa | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
0c527060 | 3 | * * |
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 | |
3d1463c8 | 18 | //----------------------------------------------------------------------------- |
d19b6003 | 19 | // Class AliMUONv1 |
20 | // -------------------- | |
21 | // AliDetector class for MUON subsystem which implements | |
22 | // functions for simulation | |
3d1463c8 | 23 | //----------------------------------------------------------------------------- |
acc838fd | 24 | |
30178c30 | 25 | #include "AliMUONv1.h" |
88cb7938 | 26 | #include "AliMUONConstants.h" |
b7ef3c96 | 27 | #include "AliMUONResponseFactory.h" |
a9e2aefa | 28 | #include "AliMUONHit.h" |
d4bb94a1 | 29 | #include "AliMUONGeometryBuilder.h" |
b7ef3c96 | 30 | #include "AliMUONGeometry.h" |
31 | #include "AliMUONGeometryTransformer.h" | |
e118b27e | 32 | #include "AliMUONGeometryModule.h" |
7ecf374b | 33 | #include "AliMUONStringIntMap.h" |
e118b27e | 34 | #include "AliMUONGeometryDetElement.h" |
7ecf374b | 35 | |
273e54a3 | 36 | #include "AliMpDEManager.h" |
37 | ||
7ecf374b | 38 | #include "AliConst.h" |
88cb7938 | 39 | #include "AliMagF.h" |
40 | #include "AliRun.h" | |
5d12ce38 | 41 | #include "AliMC.h" |
d95fe39e | 42 | #include "AliTrackReference.h" |
8c343c7c | 43 | #include "AliLog.h" |
a9e2aefa | 44 | |
7ecf374b | 45 | #include <TRandom.h> |
46 | #include <TF1.h> | |
47 | #include <TClonesArray.h> | |
48 | #include <TRandom.h> | |
49 | #include <TVirtualMC.h> | |
50 | #include <TGeoMatrix.h> | |
51 | ||
edee5e63 | 52 | #include <string> |
53 | ||
bb2bab35 | 54 | #include "AliMUONVHitStore.h" |
55 | ||
5398f946 | 56 | /// \cond CLASSIMP |
a9e2aefa | 57 | ClassImp(AliMUONv1) |
5398f946 | 58 | /// \endcond |
a9e2aefa | 59 | |
60 | //___________________________________________ | |
30178c30 | 61 | AliMUONv1::AliMUONv1() |
62 | : AliMUON(), | |
d4bb94a1 | 63 | fAngleEffect(kTRUE), |
64 | fStepMaxInActiveGas(0.6), | |
65 | fStepSum(0x0), | |
66 | fDestepSum(0x0), | |
67 | fTrackMomentum(), | |
68 | fTrackPosition(), | |
69 | fElossRatio(0x0), | |
70 | fAngleEffect10(0x0), | |
b7ef3c96 | 71 | fAngleEffectNorma(0x0) |
a9e2aefa | 72 | { |
d19b6003 | 73 | /// Default constructor |
74 | ||
75 | AliDebug(1,Form("default (empty) ctor this=%p",this)); | |
1391e633 | 76 | } |
d4bb94a1 | 77 | |
a9e2aefa | 78 | //___________________________________________ |
9bf406e1 | 79 | AliMUONv1::AliMUONv1(const char *name, const char* title) |
80 | : AliMUON(name, title), | |
d4bb94a1 | 81 | fAngleEffect(kTRUE), |
82 | fStepMaxInActiveGas(0.6), | |
83 | fStepSum(0x0), | |
84 | fDestepSum(0x0), | |
85 | fTrackMomentum(), | |
86 | fTrackPosition(), | |
87 | fElossRatio(0x0), | |
88 | fAngleEffect10(0x0), | |
b7ef3c96 | 89 | fAngleEffectNorma(0x0) |
a9e2aefa | 90 | { |
d19b6003 | 91 | /// Standard onstructor |
d4bb94a1 | 92 | |
d19b6003 | 93 | AliDebug(1,Form("ctor this=%p",this)); |
edee5e63 | 94 | |
ba030c0e | 95 | // By default include all stations |
c33d9661 | 96 | |
1391e633 | 97 | fStepSum = new Float_t [AliMUONConstants::NCh()]; |
98 | fDestepSum = new Float_t [AliMUONConstants::NCh()]; | |
99 | for (Int_t i=0; i<AliMUONConstants::NCh(); i++) { | |
100 | fStepSum[i] =0.0; | |
101 | fDestepSum[i]=0.0; | |
102 | } | |
103 | // Ratio of particle mean eloss with respect MIP's Khalil Boudjemline, sep 2003, PhD.Thesis and Particle Data Book | |
104 | fElossRatio = new TF1("ElossRatio","[0]+[1]*x+[2]*x*x+[3]*x*x*x+[4]*x*x*x*x",0.5,5.); | |
105 | fElossRatio->SetParameter(0,1.02138); | |
106 | fElossRatio->SetParameter(1,-9.54149e-02); | |
107 | fElossRatio->SetParameter(2,+7.83433e-02); | |
108 | fElossRatio->SetParameter(3,-9.98208e-03); | |
109 | fElossRatio->SetParameter(4,+3.83279e-04); | |
110 | ||
111 | // Angle effect in tracking chambers at theta =10 degres as a function of ElossRatio (Khalil BOUDJEMLINE sep 2003 Ph.D Thesis) (in micrometers) | |
112 | fAngleEffect10 = new TF1("AngleEffect10","[0]+[1]*x+[2]*x*x",0.5,3.0); | |
113 | fAngleEffect10->SetParameter(0, 1.90691e+02); | |
114 | fAngleEffect10->SetParameter(1,-6.62258e+01); | |
115 | fAngleEffect10->SetParameter(2,+1.28247e+01); | |
116 | // Angle effect: Normalisation form theta=10 degres to theta between 0 and 10 (Khalil BOUDJEMLINE sep 2003 Ph.D Thesis) | |
117 | // Angle with respect to the wires assuming that chambers are perpendicular to the z axis. | |
118 | fAngleEffectNorma = new TF1("AngleEffectNorma","[0]+[1]*x+[2]*x*x+[3]*x*x*x",0.0,10.0); | |
119 | fAngleEffectNorma->SetParameter(0,4.148); | |
120 | fAngleEffectNorma->SetParameter(1,-6.809e-01); | |
121 | fAngleEffectNorma->SetParameter(2,5.151e-02); | |
122 | fAngleEffectNorma->SetParameter(3,-1.490e-03); | |
a9e2aefa | 123 | } |
124 | ||
125 | //___________________________________________ | |
acc838fd | 126 | AliMUONv1::~AliMUONv1() |
a9e2aefa | 127 | { |
d19b6003 | 128 | /// Destructor |
129 | ||
130 | AliDebug(1,Form("dtor this=%p",this)); | |
d4bb94a1 | 131 | delete [] fStepSum; |
132 | delete [] fDestepSum; | |
133 | delete fElossRatio; | |
134 | delete fAngleEffect10; | |
8109731a | 135 | delete fAngleEffectNorma; |
acc838fd | 136 | } |
b17c0c87 | 137 | |
acc838fd | 138 | //__________________________________________________ |
139 | void AliMUONv1::CreateGeometry() | |
140 | { | |
d19b6003 | 141 | /// Construct geometry using geometry builder |
a9e2aefa | 142 | |
d4bb94a1 | 143 | fGeometryBuilder->CreateGeometry(); |
acc838fd | 144 | } |
a9e2aefa | 145 | |
acc838fd | 146 | //________________________________________________________________ |
a9e2aefa | 147 | void AliMUONv1::CreateMaterials() |
148 | { | |
d19b6003 | 149 | /// Construct materials using geometry builder |
acc838fd | 150 | |
d4bb94a1 | 151 | fGeometryBuilder->CreateMaterials(); |
a9e2aefa | 152 | } |
153 | ||
c28b5041 | 154 | //________________________________________________________________ |
155 | void AliMUONv1::AddAlignableVolumes() const | |
156 | { | |
157 | /// Construct materials using geometry builder | |
158 | ||
159 | GetGeometryTransformer()->AddAlignableVolumes(); | |
160 | } | |
161 | ||
162 | ||
acc838fd | 163 | //___________________________________________ |
a9e2aefa | 164 | void AliMUONv1::Init() |
a713db22 | 165 | { |
d19b6003 | 166 | /// Initialize geometry |
167 | ||
edee5e63 | 168 | AliDebug(1,"Start Init for version 1 - CPC chamber type"); |
002920d1 | 169 | |
edee5e63 | 170 | fGeometryBuilder->InitGeometry(); |
171 | AliDebug(1,"Finished Init for version 1 - CPC chamber type"); | |
b7ef3c96 | 172 | |
173 | ||
b7ef3c96 | 174 | // Build segmentation |
175 | // using geometry parametrisation | |
176 | // | |
b7ef3c96 | 177 | // Build response |
edee5e63 | 178 | // |
b7ef3c96 | 179 | AliMUONResponseFactory respFactory("default"); |
180 | respFactory.Build(this); | |
181 | ||
a9e2aefa | 182 | } |
1391e633 | 183 | |
d4bb94a1 | 184 | //__________________________________________________________________ |
273e54a3 | 185 | Int_t AliMUONv1::GetGeomModuleId(Int_t volId) const |
d4bb94a1 | 186 | { |
d19b6003 | 187 | /// Check if the volume with specified volId is a sensitive volume (gas) |
5398f946 | 188 | /// of some chamber and return the chamber number; |
d19b6003 | 189 | /// if not sensitive volume - return 0. |
d4bb94a1 | 190 | |
273e54a3 | 191 | for (Int_t i = 0; i < AliMUONConstants::NGeomModules(); i++) { |
b7ef3c96 | 192 | if ( GetGeometry()->GetModule(i)->IsSensitiveVolume(volId) ) |
273e54a3 | 193 | return i; |
b7ef3c96 | 194 | } |
d4bb94a1 | 195 | |
273e54a3 | 196 | return -1; |
d4bb94a1 | 197 | } |
333f7cda | 198 | |
199 | //_______________________________________________________________________________ | |
200 | TString AliMUONv1::CurrentVolumePath() const | |
201 | { | |
d19b6003 | 202 | /// Return current volume path |
203 | /// (Could be removed when this function is available via gMC) | |
333f7cda | 204 | |
205 | TString path = ""; | |
206 | TString name; | |
207 | Int_t copyNo; | |
208 | Int_t imother = 0; | |
209 | do { | |
210 | name = gMC->CurrentVolOffName(imother); | |
211 | gMC->CurrentVolOffID(imother++, copyNo); | |
212 | TString add = "/"; | |
213 | add += name; | |
7ecf374b | 214 | add += "_"; |
333f7cda | 215 | add += copyNo; |
216 | path.Insert(0,add); | |
217 | } | |
218 | while ( name != TString("ALIC") ); | |
219 | ||
220 | return path; | |
221 | } | |
222 | ||
1391e633 | 223 | //_______________________________________________________________________________ |
c33d9661 | 224 | void AliMUONv1::StepManager() |
225 | { | |
d19b6003 | 226 | /// Step manager for the chambers |
c33d9661 | 227 | |
228 | // Only charged tracks | |
d59b2ec3 | 229 | if( !(gMC->TrackCharge()) ) return; |
1391e633 | 230 | // Only charged tracks |
231 | ||
c33d9661 | 232 | // Only gas gap inside chamber |
233 | // Tag chambers and record hits when track enters | |
d95fe39e | 234 | static Int_t idvol=-1, iEnter = 0; |
1391e633 | 235 | Int_t copy; |
236 | const Float_t kBig = 1.e10; | |
d95fe39e | 237 | static Double_t xyzEnter[3]; |
acc838fd | 238 | |
239 | // | |
240 | // Only gas gap inside chamber | |
241 | // Tag chambers and record hits when track enters | |
273e54a3 | 242 | Int_t id=gMC->CurrentVolID(copy); |
243 | Int_t iGeomModule = GetGeomModuleId(id); | |
244 | if (iGeomModule == -1) return; | |
acc838fd | 245 | |
d95fe39e | 246 | // Detection elements id |
247 | const AliMUONGeometryModule* kGeometryModule | |
273e54a3 | 248 | = GetGeometry()->GetModule(iGeomModule); |
d95fe39e | 249 | AliMUONGeometryDetElement* detElement |
250 | = kGeometryModule->FindBySensitiveVolume(CurrentVolumePath()); | |
273e54a3 | 251 | |
252 | if (!detElement && iGeomModule < AliMUONConstants::NGeomModules()-2) { | |
253 | iGeomModule++; | |
254 | const AliMUONGeometryModule* kGeometryModule2 | |
255 | = GetGeometry()->GetModule(iGeomModule); | |
256 | detElement | |
257 | = kGeometryModule2->FindBySensitiveVolume(CurrentVolumePath()); | |
258 | } | |
374ebd7d | 259 | |
d95fe39e | 260 | Int_t detElemId = 0; |
261 | if (detElement) detElemId = detElement->GetUniqueID(); | |
333f7cda | 262 | |
d95fe39e | 263 | if (!detElemId) { |
273e54a3 | 264 | AliErrorStream() |
265 | << "Geometry module id: " | |
266 | << setw(3) << iGeomModule << " " | |
d95fe39e | 267 | << "Current SV: " |
268 | << CurrentVolumePath() | |
269 | << " detElemId: " | |
270 | << setw(5) << detElemId | |
271 | << endl; | |
272 | Double_t x, y, z; | |
273 | gMC->TrackPosition(x, y, z); | |
273e54a3 | 274 | AliErrorStream() |
275 | << " global position: " | |
d95fe39e | 276 | << x << ", " << y << ", " << z |
277 | << endl; | |
273e54a3 | 278 | AliErrorStream() << "DetElemId not identified." << endl; |
279 | } | |
280 | ||
281 | Int_t iChamber = AliMpDEManager::GetChamberId(detElemId) + 1; | |
282 | idvol = iChamber -1; | |
333f7cda | 283 | |
d59b2ec3 | 284 | // Filling TrackRefs file for MUON. Our Track references are the active volume of the chambers |
d95fe39e | 285 | if ( (gMC->IsTrackEntering() || gMC->IsTrackExiting() ) ) { |
286 | AliTrackReference* trackReference | |
287 | = AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber()); | |
288 | trackReference->SetUserId(detElemId); | |
289 | } | |
d59b2ec3 | 290 | |
d95fe39e | 291 | if( gMC->IsTrackEntering() ) { |
d59b2ec3 | 292 | Float_t theta = fTrackMomentum.Theta(); |
293 | if ((TMath::Pi()-theta)*kRaddeg>=15.) gMC->SetMaxStep(fStepMaxInActiveGas); // We use Pi-theta because z is negative | |
c5ce4e69 | 294 | iEnter = 1; |
295 | gMC->TrackPosition(xyzEnter[0], xyzEnter[1], xyzEnter[2]); // save coordinates of entrance point | |
d59b2ec3 | 296 | } |
297 | ||
5a0e88a7 | 298 | // AliDebug(1, |
299 | // Form("Active volume found %d chamber %d Z chamber is %f ",idvol,iChamber, | |
300 | // ( (AliMUONChamber*)(*fChambers)[idvol])->Z())) ; | |
d59b2ec3 | 301 | // Particule id and mass, |
302 | Int_t ipart = gMC->TrackPid(); | |
303 | Float_t mass = gMC->TrackMass(); | |
304 | ||
305 | fDestepSum[idvol]+=gMC->Edep(); | |
306 | // Get current particle id (ipart), track position (pos) and momentum (mom) | |
307 | if ( fStepSum[idvol]==0.0 ) gMC->TrackMomentum(fTrackMomentum); | |
308 | fStepSum[idvol]+=gMC->TrackStep(); | |
309 | ||
5a0e88a7 | 310 | // if (AliDebugLevel()) { |
311 | // AliDebug(1,Form("Step, iChamber %d, Particle %d, theta %f phi %f mass %f StepSum %f eloss %g", | |
312 | // iChamber,ipart, fTrackMomentum.Theta()*kRaddeg, fTrackMomentum.Phi()*kRaddeg, | |
313 | // mass, fStepSum[idvol], gMC->Edep())); | |
314 | // AliDebug(1,Form("Step:Track Momentum %f %f %f", fTrackMomentum.X(), fTrackMomentum.Y(), | |
315 | // fTrackMomentum.Z())); | |
316 | // gMC->TrackPosition(fTrackPosition); | |
317 | // AliDebug(1,Form("Step: Track Position %f %f %f",fTrackPosition.X(), | |
318 | // fTrackPosition.Y(),fTrackPosition.Z())) ; | |
319 | //} | |
d59b2ec3 | 320 | |
321 | // Track left chamber or StepSum larger than fStepMaxInActiveGas | |
322 | if ( gMC->IsTrackExiting() || | |
323 | gMC->IsTrackStop() || | |
324 | gMC->IsTrackDisappeared()|| | |
325 | (fStepSum[idvol]>fStepMaxInActiveGas) ) { | |
326 | ||
327 | if ( gMC->IsTrackExiting() || | |
328 | gMC->IsTrackStop() || | |
329 | gMC->IsTrackDisappeared() ) gMC->SetMaxStep(kBig); | |
c5ce4e69 | 330 | if (fDestepSum[idvol] == 0) { |
331 | // AZ - no energy release | |
332 | fStepSum[idvol] = 0; // Reset for the next event | |
333 | iEnter = 0; | |
334 | return; | |
335 | } | |
d59b2ec3 | 336 | |
337 | gMC->TrackPosition(fTrackPosition); | |
338 | Float_t theta = fTrackMomentum.Theta(); | |
339 | Float_t phi = fTrackMomentum.Phi(); | |
340 | ||
795b3f56 | 341 | Int_t merge = 0; |
342 | Double_t xyz0[3]={0}, xyz1[3]={0}, tmp[3]={0}; | |
c5ce4e69 | 343 | if (gMC->IsTrackExiting() && iEnter != 0) { |
344 | // AZ - this code is to avoid artificial hit splitting at the | |
345 | // "fake" boundary inside the same chamber. It will still produce | |
346 | // 2 hits but with the same coordinates (at the wire) to allow | |
347 | // their merging at the digitization level. | |
348 | ||
349 | // Only for a track going from the entrance to the exit from the volume | |
350 | // Get local coordinates | |
c5ce4e69 | 351 | gMC->Gmtod(xyzEnter, xyz0, 1); // local coord. at the entrance |
352 | ||
353 | fTrackPosition.Vect().GetXYZ(tmp); | |
354 | gMC->Gmtod(tmp, xyz1, 1); // local coord. at the exit | |
795b3f56 | 355 | Float_t dx = xyz0[0] - xyz1[0]; |
356 | Float_t dy = xyz0[1] - xyz1[1]; | |
357 | Float_t thLoc = TMath::ATan2 (TMath::Sqrt(dx*dx+dy*dy), TMath::Abs(xyz0[2]-xyz1[2])); | |
358 | if (thLoc * TMath::RadToDeg() < 15) merge = 1; | |
359 | } | |
c5ce4e69 | 360 | |
795b3f56 | 361 | if (merge) { |
c5ce4e69 | 362 | Double_t dz = -0.5; |
363 | if (xyz1[2] != xyz0[2]) dz = xyz0[2] / (xyz1[2] - xyz0[2]); | |
364 | tmp[0] = xyz0[0] - (xyz1[0] - xyz0[0]) * dz; // local coord. at the wire | |
365 | tmp[1] = xyz0[1] - (xyz1[1] - xyz0[1]) * dz; | |
366 | tmp[2] = xyz0[2] - (xyz1[2] - xyz0[2]) * dz; | |
367 | gMC->Gdtom(tmp, xyz1, 1); // global coord. at the wire | |
368 | fTrackPosition.SetXYZT(xyz1[0], xyz1[1], xyz1[2], fTrackPosition.T()); | |
369 | } else { | |
370 | TLorentzVector backToWire( fStepSum[idvol]/2.*sin(theta)*cos(phi), | |
371 | fStepSum[idvol]/2.*sin(theta)*sin(phi), | |
372 | fStepSum[idvol]/2.*cos(theta),0.0 ); | |
373 | fTrackPosition-=backToWire; | |
374 | //printf(" %d %d %d %f %d \n", gMC->IsTrackExiting(), gMC->IsTrackStop(), gMC->IsTrackDisappeared(), fStepSum[idvol], iEnter); | |
375 | // AliDebug(1, | |
376 | // Form("Track Position %f %f %f",fTrackPosition.X(),fTrackPosition.Y(),fTrackPosition.Z())); | |
377 | // AliDebug(1, | |
378 | // Form("Exit: Track backToWire %f %f %f",backToWire.X(),backToWire.Y(),backToWire.Z())) ; | |
379 | } | |
d59b2ec3 | 380 | |
381 | //-------------- Angle effect | |
382 | // Ratio between energy loss of particle and Mip as a function of BetaGamma of particle (Energy/Mass) | |
383 | ||
384 | Float_t betaxGamma = fTrackMomentum.P()/mass;// pc/mc2 | |
385 | Float_t sigmaEffect10degrees; | |
386 | Float_t sigmaEffectThetadegrees; | |
387 | Float_t eLossParticleELossMip; | |
388 | Float_t yAngleEffect=0.; | |
389 | Float_t thetawires = TMath::Abs( TMath::ASin( TMath::Sin(TMath::Pi()-theta) * TMath::Sin(phi) ) );// We use Pi-theta because z is negative | |
390 | ||
391 | ||
392 | if (fAngleEffect){ | |
393 | if ( (betaxGamma >3.2) && (thetawires*kRaddeg<=15.) ) { | |
394 | betaxGamma=TMath::Log(betaxGamma); | |
395 | eLossParticleELossMip = fElossRatio->Eval(betaxGamma); | |
396 | // 10 degrees is a reference for a model (arbitrary) | |
397 | sigmaEffect10degrees=fAngleEffect10->Eval(eLossParticleELossMip);// in micrometers | |
398 | // Angle with respect to the wires assuming that chambers are perpendicular to the z axis. | |
399 | sigmaEffectThetadegrees = sigmaEffect10degrees/fAngleEffectNorma->Eval(thetawires*kRaddeg); // For 5mm gap | |
400 | if ( (iChamber==1) || (iChamber==2) ) | |
401 | sigmaEffectThetadegrees/=(1.09833e+00+1.70000e-02*(thetawires*kRaddeg)); // The gap is different (4mm) | |
402 | yAngleEffect=1.e-04*gRandom->Gaus(0,sigmaEffectThetadegrees); // Error due to the angle effect in cm | |
403 | } | |
404 | } | |
405 | ||
bb2bab35 | 406 | AliMUONHit hit(fIshunt, |
d59b2ec3 | 407 | gAlice->GetMCApp()->GetCurrentTrackNumber(), |
408 | detElemId, ipart, | |
409 | fTrackPosition.X(), | |
410 | fTrackPosition.Y()+yAngleEffect, | |
411 | fTrackPosition.Z(), | |
412 | gMC->TrackTime(), | |
413 | fTrackMomentum.P(), | |
414 | theta, | |
415 | phi, | |
416 | fStepSum[idvol], | |
417 | fDestepSum[idvol], | |
418 | fTrackPosition.X(), | |
419 | fTrackPosition.Y(), | |
420 | fTrackPosition.Z()); | |
421 | ||
bb2bab35 | 422 | fHitStore->Add(hit); |
5a0e88a7 | 423 | |
d59b2ec3 | 424 | fStepSum[idvol] =0; // Reset for the next event |
425 | fDestepSum[idvol]=0; // Reset for the next event | |
c5ce4e69 | 426 | iEnter = 0; |
d59b2ec3 | 427 | } |
428 | } |