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4c039060 | 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 purpose. It is * | |
13 | * provided "as is" without express or implied warranty. * | |
14 | **************************************************************************/ | |
15 | ||
88cb7938 | 16 | /* $Id$ */ |
4c039060 | 17 | |
fe4da5cc | 18 | /////////////////////////////////////////////////////////////////////////////// |
19 | // // | |
769257f4 | 20 | // Transition Radiation Detector version 1 -- slow simulator // |
fe4da5cc | 21 | // // |
22 | //Begin_Html | |
23 | /* | |
5c7f4665 | 24 | <img src="picts/AliTRDfullClass.gif"> |
fe4da5cc | 25 | */ |
26 | //End_Html | |
27 | // // | |
28 | // // | |
29 | /////////////////////////////////////////////////////////////////////////////// | |
30 | ||
769257f4 | 31 | #include <stdlib.h> |
32 | ||
793ff80c | 33 | #include <TF1.h> |
1819f4bb | 34 | #include <TLorentzVector.h> |
88cb7938 | 35 | #include <TMath.h> |
36 | #include <TRandom.h> | |
37 | #include <TVector.h> | |
38 | #include <TVirtualMC.h> | |
fe4da5cc | 39 | |
d3f347ff | 40 | #include "AliConst.h" |
45160b1f | 41 | #include "AliLog.h" |
42 | #include "AliMC.h" | |
88cb7938 | 43 | #include "AliRun.h" |
44 | #include "AliTRDgeometry.h" | |
793ff80c | 45 | #include "AliTRDhit.h" |
793ff80c | 46 | #include "AliTRDsim.h" |
88cb7938 | 47 | #include "AliTRDv1.h" |
851d3db9 | 48 | |
fe4da5cc | 49 | ClassImp(AliTRDv1) |
8230f242 | 50 | |
51 | //_____________________________________________________________________________ | |
52 | AliTRDv1::AliTRDv1():AliTRD() | |
53 | { | |
54 | // | |
55 | // Default constructor | |
56 | // | |
57 | ||
a328fff9 | 58 | fSensSelect = 0; |
59 | fSensPlane = -1; | |
60 | fSensChamber = -1; | |
61 | fSensSector = -1; | |
62 | fSensSectorRange = 0; | |
8230f242 | 63 | |
a328fff9 | 64 | fDeltaE = NULL; |
65 | fDeltaG = NULL; | |
66 | fTR = NULL; | |
67 | ||
68 | fStepSize = 0.1; | |
69 | fTypeOfStepManager = 2; | |
8230f242 | 70 | |
71 | } | |
72 | ||
fe4da5cc | 73 | //_____________________________________________________________________________ |
74 | AliTRDv1::AliTRDv1(const char *name, const char *title) | |
75 | :AliTRD(name, title) | |
76 | { | |
77 | // | |
851d3db9 | 78 | // Standard constructor for Transition Radiation Detector version 1 |
fe4da5cc | 79 | // |
82bbf98a | 80 | |
a328fff9 | 81 | fSensSelect = 0; |
82 | fSensPlane = -1; | |
83 | fSensChamber = -1; | |
84 | fSensSector = -1; | |
85 | fSensSectorRange = 0; | |
5c7f4665 | 86 | |
a328fff9 | 87 | fDeltaE = NULL; |
88 | fDeltaG = NULL; | |
89 | fTR = NULL; | |
90 | fStepSize = 0.1; | |
91 | fTypeOfStepManager = 2; | |
5c7f4665 | 92 | |
93 | SetBufferSize(128000); | |
94 | ||
95 | } | |
96 | ||
8230f242 | 97 | //_____________________________________________________________________________ |
73ae7b59 | 98 | AliTRDv1::AliTRDv1(const AliTRDv1 &trd):AliTRD(trd) |
8230f242 | 99 | { |
100 | // | |
101 | // Copy constructor | |
102 | // | |
103 | ||
dd9a6ee3 | 104 | ((AliTRDv1 &) trd).Copy(*this); |
8230f242 | 105 | |
106 | } | |
107 | ||
5c7f4665 | 108 | //_____________________________________________________________________________ |
109 | AliTRDv1::~AliTRDv1() | |
110 | { | |
dd9a6ee3 | 111 | // |
112 | // AliTRDv1 destructor | |
113 | // | |
82bbf98a | 114 | |
5c7f4665 | 115 | if (fDeltaE) delete fDeltaE; |
a328fff9 | 116 | if (fDeltaG) delete fDeltaG; |
793ff80c | 117 | if (fTR) delete fTR; |
82bbf98a | 118 | |
fe4da5cc | 119 | } |
120 | ||
dd9a6ee3 | 121 | //_____________________________________________________________________________ |
122 | AliTRDv1 &AliTRDv1::operator=(const AliTRDv1 &trd) | |
123 | { | |
124 | // | |
125 | // Assignment operator | |
126 | // | |
127 | ||
128 | if (this != &trd) ((AliTRDv1 &) trd).Copy(*this); | |
129 | return *this; | |
130 | ||
131 | } | |
8230f242 | 132 | |
133 | //_____________________________________________________________________________ | |
e0d47c25 | 134 | void AliTRDv1::Copy(TObject &trd) const |
8230f242 | 135 | { |
136 | // | |
137 | // Copy function | |
138 | // | |
139 | ||
a328fff9 | 140 | ((AliTRDv1 &) trd).fSensSelect = fSensSelect; |
141 | ((AliTRDv1 &) trd).fSensPlane = fSensPlane; | |
142 | ((AliTRDv1 &) trd).fSensChamber = fSensChamber; | |
143 | ((AliTRDv1 &) trd).fSensSector = fSensSector; | |
144 | ((AliTRDv1 &) trd).fSensSectorRange = fSensSectorRange; | |
145 | ||
146 | ((AliTRDv1 &) trd).fTypeOfStepManager = fTypeOfStepManager; | |
147 | ((AliTRDv1 &) trd).fStepSize = fStepSize; | |
8230f242 | 148 | |
793ff80c | 149 | fDeltaE->Copy(*((AliTRDv1 &) trd).fDeltaE); |
a328fff9 | 150 | fDeltaG->Copy(*((AliTRDv1 &) trd).fDeltaG); |
793ff80c | 151 | fTR->Copy(*((AliTRDv1 &) trd).fTR); |
8230f242 | 152 | |
153 | } | |
154 | ||
fe4da5cc | 155 | //_____________________________________________________________________________ |
156 | void AliTRDv1::CreateGeometry() | |
157 | { | |
158 | // | |
851d3db9 | 159 | // Create the GEANT geometry for the Transition Radiation Detector - Version 1 |
5c7f4665 | 160 | // This version covers the full azimuth. |
d3f347ff | 161 | // |
162 | ||
82bbf98a | 163 | // Check that FRAME is there otherwise we have no place where to put the TRD |
8230f242 | 164 | AliModule* frame = gAlice->GetModule("FRAME"); |
165 | if (!frame) return; | |
d3f347ff | 166 | |
82bbf98a | 167 | // Define the chambers |
168 | AliTRD::CreateGeometry(); | |
d3f347ff | 169 | |
fe4da5cc | 170 | } |
171 | ||
172 | //_____________________________________________________________________________ | |
173 | void AliTRDv1::CreateMaterials() | |
174 | { | |
175 | // | |
851d3db9 | 176 | // Create materials for the Transition Radiation Detector version 1 |
fe4da5cc | 177 | // |
82bbf98a | 178 | |
d3f347ff | 179 | AliTRD::CreateMaterials(); |
82bbf98a | 180 | |
fe4da5cc | 181 | } |
182 | ||
793ff80c | 183 | //_____________________________________________________________________________ |
184 | void AliTRDv1::CreateTRhit(Int_t det) | |
185 | { | |
186 | // | |
187 | // Creates an electron cluster from a TR photon. | |
188 | // The photon is assumed to be created a the end of the radiator. The | |
189 | // distance after which it deposits its energy takes into account the | |
190 | // absorbtion of the entrance window and of the gas mixture in drift | |
191 | // volume. | |
192 | // | |
193 | ||
194 | // PDG code electron | |
195 | const Int_t kPdgElectron = 11; | |
196 | ||
197 | // Ionization energy | |
198 | const Float_t kWion = 22.04; | |
199 | ||
200 | // Maximum number of TR photons per track | |
201 | const Int_t kNTR = 50; | |
202 | ||
203 | TLorentzVector mom, pos; | |
793ff80c | 204 | |
793ff80c | 205 | // Create TR at the entrance of the chamber |
206 | if (gMC->IsTrackEntering()) { | |
207 | ||
f73816f5 | 208 | // Create TR only for electrons |
209 | Int_t iPdg = gMC->TrackPid(); | |
210 | if (TMath::Abs(iPdg) != kPdgElectron) return; | |
211 | ||
793ff80c | 212 | Float_t eTR[kNTR]; |
213 | Int_t nTR; | |
214 | ||
215 | // Create TR photons | |
216 | gMC->TrackMomentum(mom); | |
217 | Float_t pTot = mom.Rho(); | |
218 | fTR->CreatePhotons(iPdg,pTot,nTR,eTR); | |
219 | if (nTR > kNTR) { | |
45160b1f | 220 | AliFatal(Form("Boundary error: nTR = %d, kNTR = %d",nTR,kNTR)); |
793ff80c | 221 | } |
222 | ||
223 | // Loop through the TR photons | |
224 | for (Int_t iTR = 0; iTR < nTR; iTR++) { | |
225 | ||
226 | Float_t energyMeV = eTR[iTR] * 0.001; | |
227 | Float_t energyeV = eTR[iTR] * 1000.0; | |
228 | Float_t absLength = 0; | |
229 | Float_t sigma = 0; | |
230 | ||
231 | // Take the absorbtion in the entrance window into account | |
232 | Double_t muMy = fTR->GetMuMy(energyMeV); | |
233 | sigma = muMy * fFoilDensity; | |
842287f2 | 234 | if (sigma > 0.0) { |
235 | absLength = gRandom->Exp(1.0/sigma); | |
236 | if (absLength < AliTRDgeometry::MyThick()) continue; | |
237 | } | |
238 | else { | |
239 | continue; | |
240 | } | |
793ff80c | 241 | |
242 | // The absorbtion cross sections in the drift gas | |
3dac2b2d | 243 | // Gas-mixture (Xe/CO2) |
244 | Double_t muXe = fTR->GetMuXe(energyMeV); | |
245 | Double_t muCO = fTR->GetMuCO(energyMeV); | |
246 | sigma = (0.85 * muXe + 0.15 * muCO) * fGasDensity * fTR->GetTemp(); | |
793ff80c | 247 | |
248 | // The distance after which the energy of the TR photon | |
249 | // is deposited. | |
842287f2 | 250 | if (sigma > 0.0) { |
251 | absLength = gRandom->Exp(1.0/sigma); | |
a328fff9 | 252 | if (absLength > (AliTRDgeometry::DrThick() |
253 | + AliTRDgeometry::AmThick())) { | |
254 | continue; | |
255 | } | |
842287f2 | 256 | } |
257 | else { | |
258 | continue; | |
259 | } | |
793ff80c | 260 | |
261 | // The position of the absorbtion | |
262 | Float_t posHit[3]; | |
263 | gMC->TrackPosition(pos); | |
264 | posHit[0] = pos[0] + mom[0] / pTot * absLength; | |
265 | posHit[1] = pos[1] + mom[1] / pTot * absLength; | |
266 | posHit[2] = pos[2] + mom[2] / pTot * absLength; | |
267 | ||
268 | // Create the charge | |
269 | Int_t q = ((Int_t) (energyeV / kWion)); | |
270 | ||
271 | // Add the hit to the array. TR photon hits are marked | |
272 | // by negative charge | |
5d12ce38 | 273 | AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(),det,posHit,-q,kTRUE); |
793ff80c | 274 | |
275 | } | |
276 | ||
277 | } | |
278 | ||
279 | } | |
280 | ||
5c7f4665 | 281 | //_____________________________________________________________________________ |
282 | void AliTRDv1::Init() | |
283 | { | |
284 | // | |
285 | // Initialise Transition Radiation Detector after geometry has been built. | |
5c7f4665 | 286 | // |
287 | ||
288 | AliTRD::Init(); | |
289 | ||
45160b1f | 290 | AliDebug(1,"Slow simulator\n"); |
851d3db9 | 291 | if (fSensSelect) { |
292 | if (fSensPlane >= 0) | |
45160b1f | 293 | AliInfo(Form("Only plane %d is sensitive")); |
851d3db9 | 294 | if (fSensChamber >= 0) |
45160b1f | 295 | AliInfo(Form("Only chamber %d is sensitive",fSensChamber)); |
9d0b222b | 296 | if (fSensSector >= 0) { |
297 | Int_t sens1 = fSensSector; | |
298 | Int_t sens2 = fSensSector + fSensSectorRange; | |
793ff80c | 299 | sens2 -= ((Int_t) (sens2 / AliTRDgeometry::Nsect())) |
300 | * AliTRDgeometry::Nsect(); | |
45160b1f | 301 | AliInfo(Form("Only sectors %d - %d are sensitive\n",sens1,sens2-1)); |
9d0b222b | 302 | } |
851d3db9 | 303 | } |
793ff80c | 304 | if (fTR) |
45160b1f | 305 | AliInfo("TR simulation on") |
793ff80c | 306 | else |
45160b1f | 307 | AliInfo("TR simulation off"); |
5c7f4665 | 308 | |
309 | // First ionization potential (eV) for the gas mixture (90% Xe + 10% CO2) | |
310 | const Float_t kPoti = 12.1; | |
311 | // Maximum energy (50 keV); | |
312 | const Float_t kEend = 50000.0; | |
313 | // Ermilova distribution for the delta-ray spectrum | |
8230f242 | 314 | Float_t poti = TMath::Log(kPoti); |
315 | Float_t eEnd = TMath::Log(kEend); | |
a328fff9 | 316 | |
317 | // Ermilova distribution for the delta-ray spectrum | |
318 | fDeltaE = new TF1("deltae" ,Ermilova ,poti,eEnd,0); | |
319 | ||
320 | // Geant3 distribution for the delta-ray spectrum | |
321 | fDeltaG = new TF1("deltaeg",IntSpecGeant,poti,eEnd,0); | |
5c7f4665 | 322 | |
45160b1f | 323 | AliDebug(1,"+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++"); |
5c7f4665 | 324 | |
fe4da5cc | 325 | } |
326 | ||
793ff80c | 327 | //_____________________________________________________________________________ |
328 | AliTRDsim *AliTRDv1::CreateTR() | |
329 | { | |
330 | // | |
331 | // Enables the simulation of TR | |
332 | // | |
333 | ||
334 | fTR = new AliTRDsim(); | |
335 | return fTR; | |
336 | ||
337 | } | |
338 | ||
5c7f4665 | 339 | //_____________________________________________________________________________ |
340 | void AliTRDv1::SetSensPlane(Int_t iplane) | |
341 | { | |
342 | // | |
851d3db9 | 343 | // Defines the hit-sensitive plane (0-5) |
5c7f4665 | 344 | // |
82bbf98a | 345 | |
851d3db9 | 346 | if ((iplane < 0) || (iplane > 5)) { |
45160b1f | 347 | AliWarning(Form("Wrong input value:%d",iplane)); |
348 | AliWarning("Use standard setting"); | |
851d3db9 | 349 | fSensPlane = -1; |
350 | fSensSelect = 0; | |
5c7f4665 | 351 | return; |
352 | } | |
82bbf98a | 353 | |
5c7f4665 | 354 | fSensSelect = 1; |
355 | fSensPlane = iplane; | |
82bbf98a | 356 | |
5c7f4665 | 357 | } |
358 | ||
359 | //_____________________________________________________________________________ | |
360 | void AliTRDv1::SetSensChamber(Int_t ichamber) | |
361 | { | |
362 | // | |
851d3db9 | 363 | // Defines the hit-sensitive chamber (0-4) |
5c7f4665 | 364 | // |
365 | ||
851d3db9 | 366 | if ((ichamber < 0) || (ichamber > 4)) { |
45160b1f | 367 | AliWarning(Form("Wrong input value: %d",ichamber)); |
368 | AliWarning("Use standard setting"); | |
851d3db9 | 369 | fSensChamber = -1; |
370 | fSensSelect = 0; | |
5c7f4665 | 371 | return; |
372 | } | |
373 | ||
374 | fSensSelect = 1; | |
375 | fSensChamber = ichamber; | |
376 | ||
377 | } | |
378 | ||
379 | //_____________________________________________________________________________ | |
380 | void AliTRDv1::SetSensSector(Int_t isector) | |
381 | { | |
382 | // | |
851d3db9 | 383 | // Defines the hit-sensitive sector (0-17) |
5c7f4665 | 384 | // |
385 | ||
9d0b222b | 386 | SetSensSector(isector,1); |
387 | ||
388 | } | |
389 | ||
390 | //_____________________________________________________________________________ | |
391 | void AliTRDv1::SetSensSector(Int_t isector, Int_t nsector) | |
392 | { | |
393 | // | |
394 | // Defines a range of hit-sensitive sectors. The range is defined by | |
395 | // <isector> (0-17) as the starting point and <nsector> as the number | |
396 | // of sectors to be included. | |
397 | // | |
398 | ||
851d3db9 | 399 | if ((isector < 0) || (isector > 17)) { |
45160b1f | 400 | AliWarning(Form("Wrong input value <isector>: %d",isector)); |
401 | AliWarning("Use standard setting"); | |
9d0b222b | 402 | fSensSector = -1; |
403 | fSensSectorRange = 0; | |
404 | fSensSelect = 0; | |
5c7f4665 | 405 | return; |
406 | } | |
407 | ||
9d0b222b | 408 | if ((nsector < 1) || (nsector > 18)) { |
45160b1f | 409 | AliWarning(Form("Wrong input value <nsector>: %d",nsector)); |
410 | AliWarning("Use standard setting"); | |
9d0b222b | 411 | fSensSector = -1; |
412 | fSensSectorRange = 0; | |
413 | fSensSelect = 0; | |
414 | return; | |
415 | } | |
416 | ||
417 | fSensSelect = 1; | |
418 | fSensSector = isector; | |
419 | fSensSectorRange = nsector; | |
5c7f4665 | 420 | |
421 | } | |
422 | ||
423 | //_____________________________________________________________________________ | |
424 | void AliTRDv1::StepManager() | |
a328fff9 | 425 | { |
426 | // | |
427 | // Slow simulator. Every charged track produces electron cluster as hits | |
428 | // along its path across the drift volume. | |
429 | // | |
430 | ||
431 | switch (fTypeOfStepManager) { | |
432 | case 0 : StepManagerErmilova(); break; // 0 is Ermilova | |
433 | case 1 : StepManagerGeant(); break; // 1 is Geant | |
434 | case 2 : StepManagerFixedStep(); break; // 2 is fixed step | |
45160b1f | 435 | default : AliWarning("Not a valid Step Manager."); |
a328fff9 | 436 | } |
437 | ||
438 | } | |
439 | ||
440 | //_____________________________________________________________________________ | |
441 | void AliTRDv1::SelectStepManager(Int_t t) | |
442 | { | |
443 | // | |
444 | // Selects a step manager type: | |
445 | // 0 - Ermilova | |
446 | // 1 - Geant3 | |
447 | // 2 - Fixed step size | |
448 | // | |
449 | ||
450 | if (t == 1) { | |
45160b1f | 451 | AliWarning("Sorry, Geant parametrization step manager is not implemented yet. Please ask K.Oyama for detail."); |
a328fff9 | 452 | } |
453 | ||
454 | fTypeOfStepManager = t; | |
45160b1f | 455 | AliInfo(Form("Step Manager type %d was selected",fTypeOfStepManager)); |
a328fff9 | 456 | |
457 | } | |
458 | ||
459 | //_____________________________________________________________________________ | |
460 | void AliTRDv1::StepManagerGeant() | |
461 | { | |
462 | // | |
463 | // Slow simulator. Every charged track produces electron cluster as hits | |
464 | // along its path across the drift volume. The step size is set acording | |
465 | // to Bethe-Bloch. The energy distribution of the delta electrons follows | |
466 | // a spectrum taken from Geant3. | |
467 | // | |
468 | ||
45160b1f | 469 | AliWarning("Not implemented yet."); |
a328fff9 | 470 | |
471 | } | |
472 | ||
473 | //_____________________________________________________________________________ | |
474 | void AliTRDv1::StepManagerErmilova() | |
5c7f4665 | 475 | { |
476 | // | |
5c7f4665 | 477 | // Slow simulator. Every charged track produces electron cluster as hits |
478 | // along its path across the drift volume. The step size is set acording | |
479 | // to Bethe-Bloch. The energy distribution of the delta electrons follows | |
480 | // a spectrum taken from Ermilova et al. | |
481 | // | |
482 | ||
851d3db9 | 483 | Int_t pla = 0; |
484 | Int_t cha = 0; | |
485 | Int_t sec = 0; | |
793ff80c | 486 | Int_t det = 0; |
851d3db9 | 487 | Int_t iPdg; |
793ff80c | 488 | Int_t qTot; |
5c7f4665 | 489 | |
793ff80c | 490 | Float_t hits[3]; |
a5cadd36 | 491 | Double_t random[1]; |
5c7f4665 | 492 | Float_t charge; |
493 | Float_t aMass; | |
494 | ||
f73816f5 | 495 | Double_t pTot = 0; |
5c7f4665 | 496 | Double_t eDelta; |
497 | Double_t betaGamma, pp; | |
f73816f5 | 498 | Double_t stepSize; |
5c7f4665 | 499 | |
332e9569 | 500 | Bool_t drRegion = kFALSE; |
501 | Bool_t amRegion = kFALSE; | |
502 | ||
503 | TString cIdCurrent; | |
504 | TString cIdSensDr = "J"; | |
505 | TString cIdSensAm = "K"; | |
593a9fc3 | 506 | Char_t cIdChamber[3]; |
507 | cIdChamber[2] = 0; | |
332e9569 | 508 | |
5c7f4665 | 509 | TLorentzVector pos, mom; |
82bbf98a | 510 | |
332e9569 | 511 | const Int_t kNplan = AliTRDgeometry::Nplan(); |
e644678a | 512 | const Int_t kNcham = AliTRDgeometry::Ncham(); |
513 | const Int_t kNdetsec = kNplan * kNcham; | |
514 | ||
a328fff9 | 515 | const Double_t kBig = 1.0E+12; // Infinitely big |
516 | const Float_t kWion = 22.04; // Ionization energy | |
517 | const Float_t kPTotMaxEl = 0.002; // Maximum momentum for e+ e- g | |
5c7f4665 | 518 | |
f73816f5 | 519 | // Minimum energy for the step size adjustment |
520 | const Float_t kEkinMinStep = 1.0e-5; | |
a328fff9 | 521 | |
5c7f4665 | 522 | // Plateau value of the energy-loss for electron in xenon |
523 | // taken from: Allison + Comb, Ann. Rev. Nucl. Sci. (1980), 30, 253 | |
524 | //const Double_t kPlateau = 1.70; | |
525 | // the averaged value (26/3/99) | |
a3c76cdc | 526 | const Float_t kPlateau = 1.55; |
a328fff9 | 527 | |
528 | const Float_t kPrim = 48.0; // dN1/dx|min for the gas mixture (90% Xe + 10% CO2) | |
5c7f4665 | 529 | // First ionization potential (eV) for the gas mixture (90% Xe + 10% CO2) |
a3c76cdc | 530 | const Float_t kPoti = 12.1; |
851d3db9 | 531 | |
a328fff9 | 532 | const Int_t kPdgElectron = 11; // PDG code electron |
5c7f4665 | 533 | |
534 | // Set the maximum step size to a very large number for all | |
535 | // neutral particles and those outside the driftvolume | |
536 | gMC->SetMaxStep(kBig); | |
537 | ||
538 | // Use only charged tracks | |
539 | if (( gMC->TrackCharge() ) && | |
540 | (!gMC->IsTrackStop() ) && | |
541 | (!gMC->IsTrackDisappeared())) { | |
fe4da5cc | 542 | |
5c7f4665 | 543 | // Inside a sensitive volume? |
332e9569 | 544 | drRegion = kFALSE; |
545 | amRegion = kFALSE; | |
546 | cIdCurrent = gMC->CurrentVolName(); | |
e6674585 | 547 | if (cIdSensDr == cIdCurrent[1]) { |
332e9569 | 548 | drRegion = kTRUE; |
549 | } | |
e6674585 | 550 | if (cIdSensAm == cIdCurrent[1]) { |
332e9569 | 551 | amRegion = kTRUE; |
552 | } | |
553 | if (drRegion || amRegion) { | |
fe4da5cc | 554 | |
5c7f4665 | 555 | // The hit coordinates and charge |
556 | gMC->TrackPosition(pos); | |
557 | hits[0] = pos[0]; | |
558 | hits[1] = pos[1]; | |
559 | hits[2] = pos[2]; | |
5c7f4665 | 560 | |
851d3db9 | 561 | // The sector number (0 - 17) |
562 | // The numbering goes clockwise and starts at y = 0 | |
e15eb584 | 563 | Float_t phi = kRaddeg*TMath::ATan2(pos[0],pos[1]); |
851d3db9 | 564 | if (phi < 90.) |
565 | phi = phi + 270.; | |
566 | else | |
567 | phi = phi - 90.; | |
568 | sec = ((Int_t) (phi / 20)); | |
82bbf98a | 569 | |
332e9569 | 570 | // The plane and chamber number |
571 | cIdChamber[0] = cIdCurrent[2]; | |
572 | cIdChamber[1] = cIdCurrent[3]; | |
e644678a | 573 | Int_t idChamber = (atoi(cIdChamber) % kNdetsec); |
a5cadd36 | 574 | cha = kNcham - ((Int_t) idChamber / kNplan) - 1; |
332e9569 | 575 | pla = ((Int_t) idChamber % kNplan); |
82bbf98a | 576 | |
5c7f4665 | 577 | // Check on selected volumes |
578 | Int_t addthishit = 1; | |
579 | if (fSensSelect) { | |
6f1e466d | 580 | if ((fSensPlane >= 0) && (pla != fSensPlane )) addthishit = 0; |
581 | if ((fSensChamber >= 0) && (cha != fSensChamber)) addthishit = 0; | |
9d0b222b | 582 | if (fSensSector >= 0) { |
583 | Int_t sens1 = fSensSector; | |
584 | Int_t sens2 = fSensSector + fSensSectorRange; | |
793ff80c | 585 | sens2 -= ((Int_t) (sens2 / AliTRDgeometry::Nsect())) |
586 | * AliTRDgeometry::Nsect(); | |
9d0b222b | 587 | if (sens1 < sens2) { |
588 | if ((sec < sens1) || (sec >= sens2)) addthishit = 0; | |
589 | } | |
590 | else { | |
591 | if ((sec < sens1) && (sec >= sens2)) addthishit = 0; | |
592 | } | |
593 | } | |
5c7f4665 | 594 | } |
595 | ||
596 | // Add this hit | |
597 | if (addthishit) { | |
598 | ||
f73816f5 | 599 | // The detector number |
793ff80c | 600 | det = fGeometry->GetDetector(pla,cha,sec); |
601 | ||
a328fff9 | 602 | // Special hits only in the drift region |
332e9569 | 603 | if (drRegion) { |
f73816f5 | 604 | |
c61f1a66 | 605 | // Create a track reference at the entrance and |
606 | // exit of each chamber that contain the | |
607 | // momentum components of the particle | |
f73816f5 | 608 | if (gMC->IsTrackEntering() || gMC->IsTrackExiting()) { |
609 | gMC->TrackMomentum(mom); | |
5d12ce38 | 610 | AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber()); |
f73816f5 | 611 | } |
612 | ||
613 | // Create the hits from TR photons | |
614 | if (fTR) CreateTRhit(det); | |
615 | ||
616 | } | |
617 | ||
618 | // Calculate the energy of the delta-electrons | |
619 | eDelta = TMath::Exp(fDeltaE->GetRandom()) - kPoti; | |
620 | eDelta = TMath::Max(eDelta,0.0); | |
621 | ||
622 | // The number of secondary electrons created | |
623 | qTot = ((Int_t) (eDelta / kWion) + 1); | |
624 | ||
625 | // Create a new dEdx hit | |
332e9569 | 626 | if (drRegion) { |
a328fff9 | 627 | AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber() |
628 | ,det,hits,qTot,kTRUE); | |
f73816f5 | 629 | } |
5c7f4665 | 630 | else { |
a328fff9 | 631 | AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber() |
632 | ,det,hits,qTot,kFALSE); | |
f73816f5 | 633 | } |
634 | ||
5c7f4665 | 635 | // Calculate the maximum step size for the next tracking step |
f73816f5 | 636 | // Produce only one hit if Ekin is below cutoff |
637 | aMass = gMC->TrackMass(); | |
638 | if ((gMC->Etot() - aMass) > kEkinMinStep) { | |
639 | ||
640 | // The energy loss according to Bethe Bloch | |
641 | iPdg = TMath::Abs(gMC->TrackPid()); | |
642 | if ( (iPdg != kPdgElectron) || | |
643 | ((iPdg == kPdgElectron) && (pTot < kPTotMaxEl))) { | |
644 | gMC->TrackMomentum(mom); | |
645 | pTot = mom.Rho(); | |
646 | betaGamma = pTot / aMass; | |
647 | pp = kPrim * BetheBloch(betaGamma); | |
648 | // Take charge > 1 into account | |
649 | charge = gMC->TrackCharge(); | |
650 | if (TMath::Abs(charge) > 1) pp = pp * charge*charge; | |
651 | } | |
652 | // Electrons above 20 Mev/c are at the plateau | |
653 | else { | |
654 | pp = kPrim * kPlateau; | |
655 | } | |
656 | ||
657 | if (pp > 0) { | |
658 | do | |
b9d0a01d | 659 | gMC->GetRandom()->RndmArray(1, random); |
f73816f5 | 660 | while ((random[0] == 1.) || (random[0] == 0.)); |
661 | stepSize = - TMath::Log(random[0]) / pp; | |
662 | gMC->SetMaxStep(stepSize); | |
663 | } | |
664 | ||
5c7f4665 | 665 | } |
666 | ||
667 | } | |
d3f347ff | 668 | |
669 | } | |
670 | ||
5c7f4665 | 671 | } |
672 | ||
673 | } | |
674 | ||
a328fff9 | 675 | //_____________________________________________________________________________ |
676 | void AliTRDv1::StepManagerFixedStep() | |
677 | { | |
678 | // | |
679 | // Slow simulator. Every charged track produces electron cluster as hits | |
680 | // along its path across the drift volume. The step size is fixed in | |
681 | // this version of the step manager. | |
682 | // | |
683 | ||
684 | Int_t pla = 0; | |
685 | Int_t cha = 0; | |
686 | Int_t sec = 0; | |
687 | Int_t det = 0; | |
688 | Int_t qTot; | |
689 | ||
690 | Float_t hits[3]; | |
691 | Double_t eDep; | |
692 | ||
693 | Bool_t drRegion = kFALSE; | |
694 | Bool_t amRegion = kFALSE; | |
695 | ||
696 | TString cIdCurrent; | |
697 | TString cIdSensDr = "J"; | |
698 | TString cIdSensAm = "K"; | |
699 | Char_t cIdChamber[3]; | |
700 | cIdChamber[2] = 0; | |
701 | ||
702 | TLorentzVector pos, mom; | |
703 | ||
704 | const Int_t kNplan = AliTRDgeometry::Nplan(); | |
705 | const Int_t kNcham = AliTRDgeometry::Ncham(); | |
706 | const Int_t kNdetsec = kNplan * kNcham; | |
707 | ||
708 | const Double_t kBig = 1.0E+12; | |
709 | ||
710 | const Float_t kWion = 22.04; // Ionization energy | |
711 | const Float_t kEkinMinStep = 1.0e-5; // Minimum energy for the step size adjustment | |
712 | ||
713 | // Set the maximum step size to a very large number for all | |
714 | // neutral particles and those outside the driftvolume | |
715 | gMC->SetMaxStep(kBig); | |
716 | ||
717 | // If not charged track or already stopped or disappeared, just return. | |
718 | if ((!gMC->TrackCharge()) || | |
719 | gMC->IsTrackStop() || | |
720 | gMC->IsTrackDisappeared()) return; | |
721 | ||
722 | // Inside a sensitive volume? | |
723 | cIdCurrent = gMC->CurrentVolName(); | |
724 | ||
725 | if (cIdSensDr == cIdCurrent[1]) drRegion = kTRUE; | |
726 | if (cIdSensAm == cIdCurrent[1]) amRegion = kTRUE; | |
727 | ||
728 | if ((!drRegion) && (!amRegion)) return; | |
729 | ||
730 | // The hit coordinates and charge | |
731 | gMC->TrackPosition(pos); | |
732 | hits[0] = pos[0]; | |
733 | hits[1] = pos[1]; | |
734 | hits[2] = pos[2]; | |
735 | ||
736 | // The sector number (0 - 17) | |
737 | // The numbering goes clockwise and starts at y = 0 | |
738 | Float_t phi = kRaddeg*TMath::ATan2(pos[0],pos[1]); | |
739 | if (phi < 90.) phi += 270.; | |
740 | else phi -= 90.; | |
741 | sec = ((Int_t) (phi / 20.)); | |
742 | ||
743 | // The plane and chamber number | |
744 | cIdChamber[0] = cIdCurrent[2]; | |
745 | cIdChamber[1] = cIdCurrent[3]; | |
746 | Int_t idChamber = (atoi(cIdChamber) % kNdetsec); | |
a5cadd36 | 747 | cha = kNcham - ((Int_t) idChamber / kNplan) - 1; |
a328fff9 | 748 | pla = ((Int_t) idChamber % kNplan); |
e0d47c25 | 749 | |
a328fff9 | 750 | // Check on selected volumes |
751 | Int_t addthishit = 1; | |
752 | if(fSensSelect) { | |
753 | if ((fSensPlane >= 0) && (pla != fSensPlane )) addthishit = 0; | |
754 | if ((fSensChamber >= 0) && (cha != fSensChamber)) addthishit = 0; | |
755 | if (fSensSector >= 0) { | |
756 | Int_t sens1 = fSensSector; | |
757 | Int_t sens2 = fSensSector + fSensSectorRange; | |
758 | sens2 -= ((Int_t) (sens2 / AliTRDgeometry::Nsect())) * AliTRDgeometry::Nsect(); | |
759 | if (sens1 < sens2) { | |
760 | if ((sec < sens1) || (sec >= sens2)) addthishit = 0; | |
761 | } | |
762 | else { | |
763 | if ((sec < sens1) && (sec >= sens2)) addthishit = 0; | |
764 | } | |
765 | } | |
766 | } | |
767 | ||
768 | if (!addthishit) return; | |
769 | ||
770 | det = fGeometry->GetDetector(pla,cha,sec); // The detector number | |
771 | ||
772 | Int_t trkStat = 0; // 0: InFlight 1:Entering 2:Exiting | |
773 | ||
774 | // Special hits only in the drift region | |
775 | if (drRegion) { | |
776 | ||
777 | // Create a track reference at the entrance and exit of each | |
778 | // chamber that contain the momentum components of the particle | |
779 | ||
780 | if (gMC->IsTrackEntering()) { | |
781 | gMC->TrackMomentum(mom); | |
782 | AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber()); | |
783 | trkStat = 1; | |
784 | } | |
785 | if (gMC->IsTrackExiting()) { | |
786 | gMC->TrackMomentum(mom); | |
787 | AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber()); | |
788 | trkStat = 2; | |
789 | } | |
790 | ||
791 | // Create the hits from TR photons | |
792 | if (fTR) CreateTRhit(det); | |
793 | ||
794 | } | |
795 | ||
796 | // Calculate the charge according to GEANT Edep | |
797 | // Create a new dEdx hit | |
798 | eDep = TMath::Max(gMC->Edep(),0.0) * 1.0e+09; | |
799 | qTot = (Int_t) (eDep / kWion); | |
800 | AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(),det,hits,qTot,drRegion); | |
801 | ||
802 | // Set Maximum Step Size | |
803 | // Produce only one hit if Ekin is below cutoff | |
804 | if ((gMC->Etot() - gMC->TrackMass()) < kEkinMinStep) return; | |
805 | gMC->SetMaxStep(fStepSize); | |
806 | ||
807 | } | |
808 | ||
5c7f4665 | 809 | //_____________________________________________________________________________ |
810 | Double_t AliTRDv1::BetheBloch(Double_t bg) | |
811 | { | |
812 | // | |
813 | // Parametrization of the Bethe-Bloch-curve | |
814 | // The parametrization is the same as for the TPC and is taken from Lehrhaus. | |
815 | // | |
816 | ||
817 | // This parameters have been adjusted to averaged values from GEANT | |
818 | const Double_t kP1 = 7.17960e-02; | |
819 | const Double_t kP2 = 8.54196; | |
820 | const Double_t kP3 = 1.38065e-06; | |
821 | const Double_t kP4 = 5.30972; | |
822 | const Double_t kP5 = 2.83798; | |
823 | ||
824 | // This parameters have been adjusted to Xe-data found in: | |
825 | // Allison & Cobb, Ann. Rev. Nucl. Sci. (1980), 30, 253 | |
826 | //const Double_t kP1 = 0.76176E-1; | |
827 | //const Double_t kP2 = 10.632; | |
828 | //const Double_t kP3 = 3.17983E-6; | |
829 | //const Double_t kP4 = 1.8631; | |
830 | //const Double_t kP5 = 1.9479; | |
831 | ||
f73816f5 | 832 | // Lower cutoff of the Bethe-Bloch-curve to limit step sizes |
833 | const Double_t kBgMin = 0.8; | |
834 | const Double_t kBBMax = 6.83298; | |
835 | //const Double_t kBgMin = 0.6; | |
836 | //const Double_t kBBMax = 17.2809; | |
837 | //const Double_t kBgMin = 0.4; | |
838 | //const Double_t kBBMax = 82.0; | |
839 | ||
840 | if (bg > kBgMin) { | |
5c7f4665 | 841 | Double_t yy = bg / TMath::Sqrt(1. + bg*bg); |
842 | Double_t aa = TMath::Power(yy,kP4); | |
843 | Double_t bb = TMath::Power((1./bg),kP5); | |
844 | bb = TMath::Log(kP3 + bb); | |
845 | return ((kP2 - aa - bb)*kP1 / aa); | |
846 | } | |
f73816f5 | 847 | else { |
848 | return kBBMax; | |
849 | } | |
d3f347ff | 850 | |
fe4da5cc | 851 | } |
5c7f4665 | 852 | |
a328fff9 | 853 | //_____________________________________________________________________________ |
854 | Double_t BetheBlochGeant(Double_t bg) | |
855 | { | |
856 | // | |
857 | // Return dN/dx (number of primary collisions per centimeter) | |
858 | // for given beta*gamma factor. | |
859 | // | |
860 | // Implemented by K.Oyama according to GEANT 3 parametrization shown in | |
861 | // A.Andronic's webpage: http://www-alice.gsi.de/trd/papers/dedx/dedx.html | |
862 | // This must be used as a set with IntSpecGeant. | |
863 | // | |
864 | ||
865 | Double_t arr_g[20] = { | |
866 | 1.100000, 1.200000, 1.300000, 1.500000, | |
867 | 1.800000, 2.000000, 2.500000, 3.000000, | |
868 | 4.000000, 7.000000, 10.000000, 20.000000, | |
869 | 40.000000, 70.000000, 100.000000, 300.000000, | |
870 | 600.000000, 1000.000000, 3000.000000, 10000.000000 }; | |
871 | ||
872 | Double_t arr_nc[20] = { | |
873 | 75.009056, 45.508083, 35.299252, 27.116327, | |
874 | 22.734999, 21.411915, 19.934095, 19.449375, | |
875 | 19.344431, 20.185553, 21.027925, 22.912676, | |
876 | 24.933352, 26.504053, 27.387468, 29.566597, | |
877 | 30.353779, 30.787134, 31.129285, 31.157350 }; | |
878 | ||
879 | // betagamma to gamma | |
880 | Double_t g = TMath::Sqrt( 1. + bg*bg ); | |
881 | ||
882 | // Find the index just before the point we need. | |
883 | int i; | |
884 | for( i = 0 ; i < 18 ; i++ ) | |
885 | if( arr_g[i] < g && arr_g[i+1] > g ) | |
886 | break; | |
887 | ||
888 | // Simple interpolation. | |
889 | Double_t pp = ((arr_nc[i+1] - arr_nc[i]) / | |
890 | (arr_g[i+1]-arr_g[i])) * (g-arr_g[i]) + arr_nc[i]; | |
891 | ||
892 | return pp; | |
893 | ||
894 | } | |
895 | ||
5c7f4665 | 896 | //_____________________________________________________________________________ |
897 | Double_t Ermilova(Double_t *x, Double_t *) | |
898 | { | |
899 | // | |
900 | // Calculates the delta-ray energy distribution according to Ermilova. | |
901 | // Logarithmic scale ! | |
902 | // | |
903 | ||
904 | Double_t energy; | |
905 | Double_t dpos; | |
906 | Double_t dnde; | |
907 | ||
908 | Int_t pos1, pos2; | |
909 | ||
8230f242 | 910 | const Int_t kNv = 31; |
5c7f4665 | 911 | |
8230f242 | 912 | Float_t vxe[kNv] = { 2.3026, 2.9957, 3.4012, 3.6889, 3.9120 |
913 | , 4.0943, 4.2485, 4.3820, 4.4998, 4.6052 | |
914 | , 4.7005, 5.0752, 5.2983, 5.7038, 5.9915 | |
915 | , 6.2146, 6.5221, 6.9078, 7.3132, 7.6009 | |
916 | , 8.0064, 8.5172, 8.6995, 8.9872, 9.2103 | |
917 | , 9.4727, 9.9035,10.3735,10.5966,10.8198 | |
918 | ,11.5129 }; | |
5c7f4665 | 919 | |
8230f242 | 920 | Float_t vye[kNv] = { 80.0 , 31.0 , 23.3 , 21.1 , 21.0 |
921 | , 20.9 , 20.8 , 20.0 , 16.0 , 11.0 | |
922 | , 8.0 , 6.0 , 5.2 , 4.6 , 4.0 | |
923 | , 3.5 , 3.0 , 1.4 , 0.67 , 0.44 | |
924 | , 0.3 , 0.18 , 0.12 , 0.08 , 0.056 | |
925 | , 0.04 , 0.023, 0.015, 0.011, 0.01 | |
926 | , 0.004 }; | |
5c7f4665 | 927 | |
928 | energy = x[0]; | |
929 | ||
930 | // Find the position | |
931 | pos1 = pos2 = 0; | |
932 | dpos = 0; | |
933 | do { | |
934 | dpos = energy - vxe[pos2++]; | |
935 | } | |
936 | while (dpos > 0); | |
937 | pos2--; | |
f73816f5 | 938 | if (pos2 > kNv) pos2 = kNv - 1; |
5c7f4665 | 939 | pos1 = pos2 - 1; |
940 | ||
941 | // Differentiate between the sampling points | |
942 | dnde = (vye[pos1] - vye[pos2]) / (vxe[pos2] - vxe[pos1]); | |
943 | ||
944 | return dnde; | |
945 | ||
946 | } | |
a328fff9 | 947 | |
948 | //_____________________________________________________________________________ | |
949 | Double_t IntSpecGeant(Double_t *x, Double_t *) | |
950 | { | |
951 | // | |
952 | // Integrated spectrum from Geant3 | |
953 | // | |
954 | ||
955 | const Int_t n_pts = 83; | |
956 | Double_t arr_e[n_pts] = { | |
957 | 2.421257, 2.483278, 2.534301, 2.592230, | |
958 | 2.672067, 2.813299, 3.015059, 3.216819, | |
959 | 3.418579, 3.620338, 3.868209, 3.920198, | |
960 | 3.978284, 4.063923, 4.186264, 4.308605, | |
961 | 4.430946, 4.553288, 4.724261, 4.837736, | |
962 | 4.999842, 5.161949, 5.324056, 5.486163, | |
963 | 5.679688, 5.752998, 5.857728, 5.962457, | |
964 | 6.067185, 6.171914, 6.315653, 6.393674, | |
965 | 6.471694, 6.539689, 6.597658, 6.655627, | |
966 | 6.710957, 6.763648, 6.816338, 6.876198, | |
967 | 6.943227, 7.010257, 7.106285, 7.252151, | |
968 | 7.460531, 7.668911, 7.877290, 8.085670, | |
969 | 8.302979, 8.353585, 8.413120, 8.483500, | |
970 | 8.541030, 8.592857, 8.668865, 8.820485, | |
971 | 9.037086, 9.253686, 9.470286, 9.686887, | |
972 | 9.930838, 9.994655, 10.085822, 10.176990, | |
973 | 10.268158, 10.359325, 10.503614, 10.627565, | |
974 | 10.804637, 10.981709, 11.158781, 11.335854, | |
975 | 11.593397, 11.781165, 12.049404, 12.317644, | |
976 | 12.585884, 12.854123, 14.278421, 16.975889, | |
977 | 20.829416, 24.682943, 28.536469 | |
978 | }; | |
979 | Double_t arr_dndx[n_pts] = { | |
980 | 19.344431, 18.664679, 18.136106, 17.567745, | |
981 | 16.836426, 15.677382, 14.281277, 13.140237, | |
982 | 12.207677, 11.445510, 10.697049, 10.562296, | |
983 | 10.414673, 10.182341, 9.775256, 9.172330, | |
984 | 8.240271, 6.898587, 4.808303, 3.889751, | |
985 | 3.345288, 3.093431, 2.897347, 2.692470, | |
986 | 2.436222, 2.340029, 2.208579, 2.086489, | |
987 | 1.975535, 1.876519, 1.759626, 1.705024, | |
988 | 1.656374, 1.502638, 1.330566, 1.200697, | |
989 | 1.101168, 1.019323, 0.943867, 0.851951, | |
990 | 0.755229, 0.671576, 0.570675, 0.449672, | |
991 | 0.326722, 0.244225, 0.188225, 0.149608, | |
992 | 0.121529, 0.116289, 0.110636, 0.103490, | |
993 | 0.096147, 0.089191, 0.079780, 0.063927, | |
994 | 0.047642, 0.036341, 0.028250, 0.022285, | |
995 | 0.017291, 0.016211, 0.014802, 0.013533, | |
996 | 0.012388, 0.011352, 0.009803, 0.008537, | |
997 | 0.007039, 0.005829, 0.004843, 0.004034, | |
998 | 0.003101, 0.002564, 0.001956, 0.001494, | |
999 | 0.001142, 0.000873, 0.000210, 0.000014, | |
1000 | 0.000000, 0.000000, 0.000000 | |
1001 | }; | |
1002 | ||
1003 | Int_t i; | |
1004 | Double_t energy = x[0]; | |
1005 | Double_t dnde; | |
1006 | ||
1007 | for( i = 0 ; i < n_pts ; i++ ) | |
1008 | if( energy < arr_e[i] ) break; | |
1009 | ||
1010 | if( i == 0 ) | |
45160b1f | 1011 | AliErrorGeneral("AliTRDv1","Given energy value is too small or zero"); |
a328fff9 | 1012 | |
1013 | // Interpolate | |
1014 | dnde = (arr_dndx[i-1] - arr_dndx[i]) / (arr_e[i] - arr_e[i-1]); | |
1015 | ||
1016 | return dnde; | |
1017 | ||
1018 | } |