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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 | ||
16 | /* | |
17 | $Log$ | |
769257f4 | 18 | Revision 1.23 2000/11/01 14:53:21 cblume |
19 | Merge with TRD-develop | |
20 | ||
793ff80c | 21 | Revision 1.17.2.5 2000/10/15 23:40:01 cblume |
22 | Remove AliTRDconst | |
23 | ||
24 | Revision 1.17.2.4 2000/10/06 16:49:46 cblume | |
25 | Made Getters const | |
26 | ||
27 | Revision 1.17.2.3 2000/10/04 16:34:58 cblume | |
28 | Replace include files by forward declarations | |
29 | ||
30 | Revision 1.17.2.2 2000/09/18 13:50:17 cblume | |
31 | Include TR photon generation and adapt to new AliTRDhit | |
32 | ||
33 | Revision 1.22 2000/06/27 13:08:50 cblume | |
34 | Changed to Copy(TObject &A) to appease the HP-compiler | |
35 | ||
43da34c0 | 36 | Revision 1.21 2000/06/09 11:10:07 cblume |
37 | Compiler warnings and coding conventions, next round | |
38 | ||
dd9a6ee3 | 39 | Revision 1.20 2000/06/08 18:32:58 cblume |
40 | Make code compliant to coding conventions | |
41 | ||
8230f242 | 42 | Revision 1.19 2000/06/07 16:27:32 cblume |
43 | Try to remove compiler warnings on Sun and HP | |
44 | ||
9d0b222b | 45 | Revision 1.18 2000/05/08 16:17:27 cblume |
46 | Merge TRD-develop | |
47 | ||
6f1e466d | 48 | Revision 1.17.2.1 2000/05/08 14:59:16 cblume |
49 | Made inline function non-virtual. Bug fix in setting sensitive chamber | |
50 | ||
51 | Revision 1.17 2000/02/28 19:10:26 cblume | |
52 | Include the new TRD classes | |
53 | ||
851d3db9 | 54 | Revision 1.16.4.1 2000/02/28 18:04:35 cblume |
55 | Change to new hit version, introduce geometry class, and move digitization and clustering to AliTRDdigitizer/AliTRDclusterizerV1 | |
56 | ||
57 | Revision 1.16 1999/11/05 22:50:28 fca | |
58 | Do not use Atan, removed from ROOT too | |
59 | ||
90f8d287 | 60 | Revision 1.15 1999/11/02 17:20:19 fca |
61 | initialise nbytes before using it | |
62 | ||
036da493 | 63 | Revision 1.14 1999/11/02 17:15:54 fca |
64 | Correct ansi scoping not accepted by HP compilers | |
65 | ||
0549c011 | 66 | Revision 1.13 1999/11/02 17:14:51 fca |
67 | Correct ansi scoping not accepted by HP compilers | |
68 | ||
9c767df4 | 69 | Revision 1.12 1999/11/02 16:35:56 fca |
70 | New version of TRD introduced | |
71 | ||
5c7f4665 | 72 | Revision 1.11 1999/11/01 20:41:51 fca |
73 | Added protections against using the wrong version of FRAME | |
74 | ||
ab76897d | 75 | Revision 1.10 1999/09/29 09:24:35 fca |
76 | Introduction of the Copyright and cvs Log | |
77 | ||
4c039060 | 78 | */ |
79 | ||
fe4da5cc | 80 | /////////////////////////////////////////////////////////////////////////////// |
81 | // // | |
769257f4 | 82 | // Transition Radiation Detector version 1 -- slow simulator // |
fe4da5cc | 83 | // // |
84 | //Begin_Html | |
85 | /* | |
5c7f4665 | 86 | <img src="picts/AliTRDfullClass.gif"> |
fe4da5cc | 87 | */ |
88 | //End_Html | |
89 | // // | |
90 | // // | |
91 | /////////////////////////////////////////////////////////////////////////////// | |
92 | ||
769257f4 | 93 | #include <stdlib.h> |
94 | ||
fe4da5cc | 95 | #include <TMath.h> |
fe4da5cc | 96 | #include <TVector.h> |
5c7f4665 | 97 | #include <TRandom.h> |
793ff80c | 98 | #include <TF1.h> |
fe4da5cc | 99 | |
fe4da5cc | 100 | #include "AliRun.h" |
fe4da5cc | 101 | #include "AliMC.h" |
d3f347ff | 102 | #include "AliConst.h" |
5c7f4665 | 103 | |
851d3db9 | 104 | #include "AliTRDv1.h" |
793ff80c | 105 | #include "AliTRDhit.h" |
851d3db9 | 106 | #include "AliTRDmatrix.h" |
107 | #include "AliTRDgeometry.h" | |
793ff80c | 108 | #include "AliTRDsim.h" |
851d3db9 | 109 | |
fe4da5cc | 110 | ClassImp(AliTRDv1) |
8230f242 | 111 | |
112 | //_____________________________________________________________________________ | |
113 | AliTRDv1::AliTRDv1():AliTRD() | |
114 | { | |
115 | // | |
116 | // Default constructor | |
117 | // | |
118 | ||
119 | fIdSens = 0; | |
120 | ||
121 | fIdChamber1 = 0; | |
122 | fIdChamber2 = 0; | |
123 | fIdChamber3 = 0; | |
124 | ||
125 | fSensSelect = 0; | |
126 | fSensPlane = -1; | |
127 | fSensChamber = -1; | |
128 | fSensSector = -1; | |
129 | fSensSectorRange = 0; | |
130 | ||
131 | fDeltaE = NULL; | |
793ff80c | 132 | fTR = NULL; |
8230f242 | 133 | |
134 | } | |
135 | ||
fe4da5cc | 136 | //_____________________________________________________________________________ |
137 | AliTRDv1::AliTRDv1(const char *name, const char *title) | |
138 | :AliTRD(name, title) | |
139 | { | |
140 | // | |
851d3db9 | 141 | // Standard constructor for Transition Radiation Detector version 1 |
fe4da5cc | 142 | // |
82bbf98a | 143 | |
9d0b222b | 144 | fIdSens = 0; |
82bbf98a | 145 | |
9d0b222b | 146 | fIdChamber1 = 0; |
147 | fIdChamber2 = 0; | |
148 | fIdChamber3 = 0; | |
5c7f4665 | 149 | |
9d0b222b | 150 | fSensSelect = 0; |
151 | fSensPlane = -1; | |
152 | fSensChamber = -1; | |
153 | fSensSector = -1; | |
8230f242 | 154 | fSensSectorRange = 0; |
5c7f4665 | 155 | |
9d0b222b | 156 | fDeltaE = NULL; |
793ff80c | 157 | fTR = NULL; |
5c7f4665 | 158 | |
159 | SetBufferSize(128000); | |
160 | ||
161 | } | |
162 | ||
8230f242 | 163 | //_____________________________________________________________________________ |
dd9a6ee3 | 164 | AliTRDv1::AliTRDv1(const AliTRDv1 &trd) |
8230f242 | 165 | { |
166 | // | |
167 | // Copy constructor | |
168 | // | |
169 | ||
dd9a6ee3 | 170 | ((AliTRDv1 &) trd).Copy(*this); |
8230f242 | 171 | |
172 | } | |
173 | ||
5c7f4665 | 174 | //_____________________________________________________________________________ |
175 | AliTRDv1::~AliTRDv1() | |
176 | { | |
dd9a6ee3 | 177 | // |
178 | // AliTRDv1 destructor | |
179 | // | |
82bbf98a | 180 | |
5c7f4665 | 181 | if (fDeltaE) delete fDeltaE; |
793ff80c | 182 | if (fTR) delete fTR; |
82bbf98a | 183 | |
fe4da5cc | 184 | } |
185 | ||
dd9a6ee3 | 186 | //_____________________________________________________________________________ |
187 | AliTRDv1 &AliTRDv1::operator=(const AliTRDv1 &trd) | |
188 | { | |
189 | // | |
190 | // Assignment operator | |
191 | // | |
192 | ||
193 | if (this != &trd) ((AliTRDv1 &) trd).Copy(*this); | |
194 | return *this; | |
195 | ||
196 | } | |
8230f242 | 197 | |
198 | //_____________________________________________________________________________ | |
43da34c0 | 199 | void AliTRDv1::Copy(TObject &trd) |
8230f242 | 200 | { |
201 | // | |
202 | // Copy function | |
203 | // | |
204 | ||
43da34c0 | 205 | ((AliTRDv1 &) trd).fIdSens = fIdSens; |
8230f242 | 206 | |
43da34c0 | 207 | ((AliTRDv1 &) trd).fIdChamber1 = fIdChamber1; |
208 | ((AliTRDv1 &) trd).fIdChamber2 = fIdChamber2; | |
209 | ((AliTRDv1 &) trd).fIdChamber3 = fIdChamber3; | |
8230f242 | 210 | |
43da34c0 | 211 | ((AliTRDv1 &) trd).fSensSelect = fSensSelect; |
212 | ((AliTRDv1 &) trd).fSensPlane = fSensPlane; | |
213 | ((AliTRDv1 &) trd).fSensChamber = fSensChamber; | |
214 | ((AliTRDv1 &) trd).fSensSector = fSensSector; | |
215 | ((AliTRDv1 &) trd).fSensSectorRange = fSensSectorRange; | |
8230f242 | 216 | |
793ff80c | 217 | fDeltaE->Copy(*((AliTRDv1 &) trd).fDeltaE); |
218 | fTR->Copy(*((AliTRDv1 &) trd).fTR); | |
8230f242 | 219 | |
220 | } | |
221 | ||
fe4da5cc | 222 | //_____________________________________________________________________________ |
223 | void AliTRDv1::CreateGeometry() | |
224 | { | |
225 | // | |
851d3db9 | 226 | // Create the GEANT geometry for the Transition Radiation Detector - Version 1 |
5c7f4665 | 227 | // This version covers the full azimuth. |
d3f347ff | 228 | // |
229 | ||
82bbf98a | 230 | // Check that FRAME is there otherwise we have no place where to put the TRD |
8230f242 | 231 | AliModule* frame = gAlice->GetModule("FRAME"); |
232 | if (!frame) return; | |
d3f347ff | 233 | |
82bbf98a | 234 | // Define the chambers |
235 | AliTRD::CreateGeometry(); | |
d3f347ff | 236 | |
fe4da5cc | 237 | } |
238 | ||
239 | //_____________________________________________________________________________ | |
240 | void AliTRDv1::CreateMaterials() | |
241 | { | |
242 | // | |
851d3db9 | 243 | // Create materials for the Transition Radiation Detector version 1 |
fe4da5cc | 244 | // |
82bbf98a | 245 | |
d3f347ff | 246 | AliTRD::CreateMaterials(); |
82bbf98a | 247 | |
fe4da5cc | 248 | } |
249 | ||
793ff80c | 250 | //_____________________________________________________________________________ |
251 | void AliTRDv1::CreateTRhit(Int_t det) | |
252 | { | |
253 | // | |
254 | // Creates an electron cluster from a TR photon. | |
255 | // The photon is assumed to be created a the end of the radiator. The | |
256 | // distance after which it deposits its energy takes into account the | |
257 | // absorbtion of the entrance window and of the gas mixture in drift | |
258 | // volume. | |
259 | // | |
260 | ||
261 | // PDG code electron | |
262 | const Int_t kPdgElectron = 11; | |
263 | ||
264 | // Ionization energy | |
265 | const Float_t kWion = 22.04; | |
266 | ||
267 | // Maximum number of TR photons per track | |
268 | const Int_t kNTR = 50; | |
269 | ||
270 | TLorentzVector mom, pos; | |
271 | TClonesArray &lhits = *fHits; | |
272 | ||
273 | // Create TR only for electrons | |
274 | Int_t iPdg = gMC->TrackPid(); | |
275 | if (TMath::Abs(iPdg) != kPdgElectron) return; | |
276 | ||
277 | // Create TR at the entrance of the chamber | |
278 | if (gMC->IsTrackEntering()) { | |
279 | ||
280 | Float_t eTR[kNTR]; | |
281 | Int_t nTR; | |
282 | ||
283 | // Create TR photons | |
284 | gMC->TrackMomentum(mom); | |
285 | Float_t pTot = mom.Rho(); | |
286 | fTR->CreatePhotons(iPdg,pTot,nTR,eTR); | |
287 | if (nTR > kNTR) { | |
288 | printf("AliTRDv1::CreateTRhit -- "); | |
289 | printf("Boundary error: nTR = %d, kNTR = %d\n",nTR,kNTR); | |
290 | exit(1); | |
291 | } | |
292 | ||
293 | // Loop through the TR photons | |
294 | for (Int_t iTR = 0; iTR < nTR; iTR++) { | |
295 | ||
296 | Float_t energyMeV = eTR[iTR] * 0.001; | |
297 | Float_t energyeV = eTR[iTR] * 1000.0; | |
298 | Float_t absLength = 0; | |
299 | Float_t sigma = 0; | |
300 | ||
301 | // Take the absorbtion in the entrance window into account | |
302 | Double_t muMy = fTR->GetMuMy(energyMeV); | |
303 | sigma = muMy * fFoilDensity; | |
304 | absLength = gRandom->Exp(sigma); | |
305 | if (absLength < AliTRDgeometry::MyThick()) continue; | |
306 | ||
307 | // The absorbtion cross sections in the drift gas | |
308 | if (fGasMix == 1) { | |
309 | // Gas-mixture (Xe/CO2) | |
310 | Double_t muXe = fTR->GetMuXe(energyMeV); | |
311 | Double_t muCO = fTR->GetMuCO(energyMeV); | |
312 | sigma = (0.90 * muXe + 0.10 * muCO) * fGasDensity; | |
313 | } | |
314 | else { | |
315 | // Gas-mixture (Xe/Isobutane) | |
316 | Double_t muXe = fTR->GetMuXe(energyMeV); | |
317 | Double_t muBu = fTR->GetMuBu(energyMeV); | |
318 | sigma = (0.97 * muXe + 0.03 * muBu) * fGasDensity; | |
319 | } | |
320 | ||
321 | // The distance after which the energy of the TR photon | |
322 | // is deposited. | |
323 | absLength = gRandom->Exp(sigma); | |
324 | if (absLength > AliTRDgeometry::DrThick()) continue; | |
325 | ||
326 | // The position of the absorbtion | |
327 | Float_t posHit[3]; | |
328 | gMC->TrackPosition(pos); | |
329 | posHit[0] = pos[0] + mom[0] / pTot * absLength; | |
330 | posHit[1] = pos[1] + mom[1] / pTot * absLength; | |
331 | posHit[2] = pos[2] + mom[2] / pTot * absLength; | |
332 | ||
333 | // Create the charge | |
334 | Int_t q = ((Int_t) (energyeV / kWion)); | |
335 | ||
336 | // Add the hit to the array. TR photon hits are marked | |
337 | // by negative charge | |
338 | new(lhits[fNhits++]) AliTRDhit(fIshunt,gAlice->CurrentTrack() | |
339 | ,det,posHit,-q); | |
340 | ||
341 | } | |
342 | ||
343 | } | |
344 | ||
345 | } | |
346 | ||
5c7f4665 | 347 | //_____________________________________________________________________________ |
348 | void AliTRDv1::Init() | |
349 | { | |
350 | // | |
351 | // Initialise Transition Radiation Detector after geometry has been built. | |
5c7f4665 | 352 | // |
353 | ||
354 | AliTRD::Init(); | |
355 | ||
851d3db9 | 356 | printf(" Slow simulator\n\n"); |
357 | if (fSensSelect) { | |
358 | if (fSensPlane >= 0) | |
359 | printf(" Only plane %d is sensitive\n",fSensPlane); | |
360 | if (fSensChamber >= 0) | |
361 | printf(" Only chamber %d is sensitive\n",fSensChamber); | |
9d0b222b | 362 | if (fSensSector >= 0) { |
363 | Int_t sens1 = fSensSector; | |
364 | Int_t sens2 = fSensSector + fSensSectorRange; | |
793ff80c | 365 | sens2 -= ((Int_t) (sens2 / AliTRDgeometry::Nsect())) |
366 | * AliTRDgeometry::Nsect(); | |
9d0b222b | 367 | printf(" Only sectors %d - %d are sensitive\n",sens1,sens2-1); |
368 | } | |
851d3db9 | 369 | } |
793ff80c | 370 | if (fTR) |
371 | printf(" TR simulation on\n"); | |
372 | else | |
373 | printf(" TR simulation off\n"); | |
851d3db9 | 374 | printf("\n"); |
5c7f4665 | 375 | |
376 | // First ionization potential (eV) for the gas mixture (90% Xe + 10% CO2) | |
377 | const Float_t kPoti = 12.1; | |
378 | // Maximum energy (50 keV); | |
379 | const Float_t kEend = 50000.0; | |
380 | // Ermilova distribution for the delta-ray spectrum | |
8230f242 | 381 | Float_t poti = TMath::Log(kPoti); |
382 | Float_t eEnd = TMath::Log(kEend); | |
793ff80c | 383 | fDeltaE = new TF1("deltae",Ermilova,poti,eEnd,0); |
5c7f4665 | 384 | |
385 | // Identifier of the sensitive volume (drift region) | |
386 | fIdSens = gMC->VolId("UL05"); | |
82bbf98a | 387 | |
388 | // Identifier of the TRD-driftchambers | |
389 | fIdChamber1 = gMC->VolId("UCIO"); | |
390 | fIdChamber2 = gMC->VolId("UCIM"); | |
391 | fIdChamber3 = gMC->VolId("UCII"); | |
392 | ||
5c7f4665 | 393 | for (Int_t i = 0; i < 80; i++) printf("*"); |
394 | printf("\n"); | |
395 | ||
fe4da5cc | 396 | } |
397 | ||
793ff80c | 398 | //_____________________________________________________________________________ |
399 | AliTRDsim *AliTRDv1::CreateTR() | |
400 | { | |
401 | // | |
402 | // Enables the simulation of TR | |
403 | // | |
404 | ||
405 | fTR = new AliTRDsim(); | |
406 | return fTR; | |
407 | ||
408 | } | |
409 | ||
5c7f4665 | 410 | //_____________________________________________________________________________ |
411 | void AliTRDv1::SetSensPlane(Int_t iplane) | |
412 | { | |
413 | // | |
851d3db9 | 414 | // Defines the hit-sensitive plane (0-5) |
5c7f4665 | 415 | // |
82bbf98a | 416 | |
851d3db9 | 417 | if ((iplane < 0) || (iplane > 5)) { |
5c7f4665 | 418 | printf("Wrong input value: %d\n",iplane); |
419 | printf("Use standard setting\n"); | |
851d3db9 | 420 | fSensPlane = -1; |
421 | fSensSelect = 0; | |
5c7f4665 | 422 | return; |
423 | } | |
82bbf98a | 424 | |
5c7f4665 | 425 | fSensSelect = 1; |
426 | fSensPlane = iplane; | |
82bbf98a | 427 | |
5c7f4665 | 428 | } |
429 | ||
430 | //_____________________________________________________________________________ | |
431 | void AliTRDv1::SetSensChamber(Int_t ichamber) | |
432 | { | |
433 | // | |
851d3db9 | 434 | // Defines the hit-sensitive chamber (0-4) |
5c7f4665 | 435 | // |
436 | ||
851d3db9 | 437 | if ((ichamber < 0) || (ichamber > 4)) { |
5c7f4665 | 438 | printf("Wrong input value: %d\n",ichamber); |
439 | printf("Use standard setting\n"); | |
851d3db9 | 440 | fSensChamber = -1; |
441 | fSensSelect = 0; | |
5c7f4665 | 442 | return; |
443 | } | |
444 | ||
445 | fSensSelect = 1; | |
446 | fSensChamber = ichamber; | |
447 | ||
448 | } | |
449 | ||
450 | //_____________________________________________________________________________ | |
451 | void AliTRDv1::SetSensSector(Int_t isector) | |
452 | { | |
453 | // | |
851d3db9 | 454 | // Defines the hit-sensitive sector (0-17) |
5c7f4665 | 455 | // |
456 | ||
9d0b222b | 457 | SetSensSector(isector,1); |
458 | ||
459 | } | |
460 | ||
461 | //_____________________________________________________________________________ | |
462 | void AliTRDv1::SetSensSector(Int_t isector, Int_t nsector) | |
463 | { | |
464 | // | |
465 | // Defines a range of hit-sensitive sectors. The range is defined by | |
466 | // <isector> (0-17) as the starting point and <nsector> as the number | |
467 | // of sectors to be included. | |
468 | // | |
469 | ||
851d3db9 | 470 | if ((isector < 0) || (isector > 17)) { |
9d0b222b | 471 | printf("Wrong input value <isector>: %d\n",isector); |
5c7f4665 | 472 | printf("Use standard setting\n"); |
9d0b222b | 473 | fSensSector = -1; |
474 | fSensSectorRange = 0; | |
475 | fSensSelect = 0; | |
5c7f4665 | 476 | return; |
477 | } | |
478 | ||
9d0b222b | 479 | if ((nsector < 1) || (nsector > 18)) { |
480 | printf("Wrong input value <nsector>: %d\n",nsector); | |
481 | printf("Use standard setting\n"); | |
482 | fSensSector = -1; | |
483 | fSensSectorRange = 0; | |
484 | fSensSelect = 0; | |
485 | return; | |
486 | } | |
487 | ||
488 | fSensSelect = 1; | |
489 | fSensSector = isector; | |
490 | fSensSectorRange = nsector; | |
5c7f4665 | 491 | |
492 | } | |
493 | ||
494 | //_____________________________________________________________________________ | |
495 | void AliTRDv1::StepManager() | |
496 | { | |
497 | // | |
5c7f4665 | 498 | // Slow simulator. Every charged track produces electron cluster as hits |
499 | // along its path across the drift volume. The step size is set acording | |
500 | // to Bethe-Bloch. The energy distribution of the delta electrons follows | |
501 | // a spectrum taken from Ermilova et al. | |
502 | // | |
503 | ||
504 | Int_t iIdSens, icSens; | |
505 | Int_t iIdSpace, icSpace; | |
506 | Int_t iIdChamber, icChamber; | |
851d3db9 | 507 | Int_t pla = 0; |
508 | Int_t cha = 0; | |
509 | Int_t sec = 0; | |
793ff80c | 510 | Int_t det = 0; |
851d3db9 | 511 | Int_t iPdg; |
793ff80c | 512 | Int_t qTot; |
5c7f4665 | 513 | |
793ff80c | 514 | Float_t hits[3]; |
5c7f4665 | 515 | Float_t random[1]; |
516 | Float_t charge; | |
517 | Float_t aMass; | |
518 | ||
519 | Double_t pTot; | |
5c7f4665 | 520 | Double_t eDelta; |
521 | Double_t betaGamma, pp; | |
522 | ||
523 | TLorentzVector pos, mom; | |
82bbf98a | 524 | TClonesArray &lhits = *fHits; |
525 | ||
851d3db9 | 526 | const Double_t kBig = 1.0E+12; |
5c7f4665 | 527 | |
528 | // Ionization energy | |
851d3db9 | 529 | const Float_t kWion = 22.04; |
5c7f4665 | 530 | // Maximum energy for e+ e- g for the step-size calculation |
851d3db9 | 531 | const Float_t kPTotMax = 0.002; |
5c7f4665 | 532 | // Plateau value of the energy-loss for electron in xenon |
533 | // taken from: Allison + Comb, Ann. Rev. Nucl. Sci. (1980), 30, 253 | |
534 | //const Double_t kPlateau = 1.70; | |
535 | // the averaged value (26/3/99) | |
851d3db9 | 536 | const Float_t kPlateau = 1.55; |
5c7f4665 | 537 | // dN1/dx|min for the gas mixture (90% Xe + 10% CO2) |
851d3db9 | 538 | const Float_t kPrim = 48.0; |
5c7f4665 | 539 | // First ionization potential (eV) for the gas mixture (90% Xe + 10% CO2) |
851d3db9 | 540 | const Float_t kPoti = 12.1; |
541 | ||
542 | // PDG code electron | |
8230f242 | 543 | const Int_t kPdgElectron = 11; |
5c7f4665 | 544 | |
545 | // Set the maximum step size to a very large number for all | |
546 | // neutral particles and those outside the driftvolume | |
547 | gMC->SetMaxStep(kBig); | |
548 | ||
769257f4 | 549 | // Create some special hits with amplitude 0 at the entrance and |
550 | // exit of each chamber that contain the momentum components of the particle | |
551 | if (gMC->TrackCharge() && | |
552 | (gMC->IsTrackEntering() || gMC->IsTrackExiting())) { | |
553 | ||
554 | // Inside a sensitive volume? | |
555 | iIdSens = gMC->CurrentVolID(icSens); | |
556 | if (iIdSens == fIdSens) { | |
557 | ||
558 | iIdSpace = gMC->CurrentVolOffID(4,icSpace ); | |
559 | iIdChamber = gMC->CurrentVolOffID(1,icChamber); | |
560 | ||
561 | // The hit coordinates | |
562 | gMC->TrackPosition(pos); | |
563 | ||
564 | // The track momentum | |
565 | gMC->TrackMomentum(mom); | |
566 | hits[0] = mom[0]; | |
567 | hits[1] = mom[1]; | |
568 | hits[2] = mom[2]; | |
569 | ||
570 | // The sector number (0 - 17) | |
571 | // The numbering goes clockwise and starts at y = 0 | |
572 | Float_t phi = kRaddeg*TMath::ATan2(pos[0],pos[1]); | |
573 | if (phi < 90.) | |
574 | phi = phi + 270.; | |
575 | else | |
576 | phi = phi - 90.; | |
577 | sec = ((Int_t) (phi / 20)); | |
578 | ||
579 | // The chamber number | |
580 | // 0: outer left | |
581 | // 1: middle left | |
582 | // 2: inner | |
583 | // 3: middle right | |
584 | // 4: outer right | |
585 | if (iIdChamber == fIdChamber1) | |
586 | cha = (hits[2] < 0 ? 0 : 4); | |
587 | else if (iIdChamber == fIdChamber2) | |
588 | cha = (hits[2] < 0 ? 1 : 3); | |
589 | else if (iIdChamber == fIdChamber3) | |
590 | cha = 2; | |
591 | ||
592 | // The plane number | |
593 | // The numbering starts at the innermost plane | |
594 | pla = icChamber - TMath::Nint((Float_t) (icChamber / 7)) * 6 - 1; | |
595 | ||
596 | // Check on selected volumes | |
597 | Int_t addthishit = 1; | |
598 | if (fSensSelect) { | |
599 | if ((fSensPlane >= 0) && (pla != fSensPlane )) addthishit = 0; | |
600 | if ((fSensChamber >= 0) && (cha != fSensChamber)) addthishit = 0; | |
601 | if (fSensSector >= 0) { | |
602 | Int_t sens1 = fSensSector; | |
603 | Int_t sens2 = fSensSector + fSensSectorRange; | |
604 | sens2 -= ((Int_t) (sens2 / AliTRDgeometry::Nsect())) | |
605 | * AliTRDgeometry::Nsect(); | |
606 | if (sens1 < sens2) { | |
607 | if ((sec < sens1) || (sec >= sens2)) addthishit = 0; | |
608 | } | |
609 | else { | |
610 | if ((sec < sens1) && (sec >= sens2)) addthishit = 0; | |
611 | } | |
612 | } | |
613 | } | |
614 | ||
615 | // Add this hit | |
616 | if (addthishit) { | |
617 | det = fGeometry->GetDetector(pla,cha,sec); | |
618 | new(lhits[fNhits++]) AliTRDhit(fIshunt | |
619 | ,gAlice->CurrentTrack() | |
620 | ,det | |
621 | ,hits | |
622 | ,0); | |
623 | } | |
624 | ||
625 | } | |
626 | ||
627 | } | |
628 | ||
5c7f4665 | 629 | // Use only charged tracks |
630 | if (( gMC->TrackCharge() ) && | |
631 | (!gMC->IsTrackStop() ) && | |
632 | (!gMC->IsTrackDisappeared())) { | |
fe4da5cc | 633 | |
5c7f4665 | 634 | // Inside a sensitive volume? |
82bbf98a | 635 | iIdSens = gMC->CurrentVolID(icSens); |
636 | if (iIdSens == fIdSens) { | |
637 | ||
82bbf98a | 638 | iIdSpace = gMC->CurrentVolOffID(4,icSpace ); |
639 | iIdChamber = gMC->CurrentVolOffID(1,icChamber); | |
fe4da5cc | 640 | |
5c7f4665 | 641 | // Calculate the energy of the delta-electrons |
642 | eDelta = TMath::Exp(fDeltaE->GetRandom()) - kPoti; | |
643 | eDelta = TMath::Max(eDelta,0.0); | |
644 | ||
645 | // The number of secondary electrons created | |
793ff80c | 646 | qTot = ((Int_t) (eDelta / kWion) + 1); |
5c7f4665 | 647 | |
648 | // The hit coordinates and charge | |
649 | gMC->TrackPosition(pos); | |
650 | hits[0] = pos[0]; | |
651 | hits[1] = pos[1]; | |
652 | hits[2] = pos[2]; | |
5c7f4665 | 653 | |
851d3db9 | 654 | // The sector number (0 - 17) |
655 | // The numbering goes clockwise and starts at y = 0 | |
656 | Float_t phi = kRaddeg*TMath::ATan2(pos[0],pos[1]); | |
657 | if (phi < 90.) | |
658 | phi = phi + 270.; | |
659 | else | |
660 | phi = phi - 90.; | |
661 | sec = ((Int_t) (phi / 20)); | |
82bbf98a | 662 | |
d3f347ff | 663 | // The chamber number |
851d3db9 | 664 | // 0: outer left |
665 | // 1: middle left | |
666 | // 2: inner | |
667 | // 3: middle right | |
668 | // 4: outer right | |
82bbf98a | 669 | if (iIdChamber == fIdChamber1) |
851d3db9 | 670 | cha = (hits[2] < 0 ? 0 : 4); |
82bbf98a | 671 | else if (iIdChamber == fIdChamber2) |
851d3db9 | 672 | cha = (hits[2] < 0 ? 1 : 3); |
82bbf98a | 673 | else if (iIdChamber == fIdChamber3) |
851d3db9 | 674 | cha = 2; |
82bbf98a | 675 | |
fe4da5cc | 676 | // The plane number |
851d3db9 | 677 | // The numbering starts at the innermost plane |
678 | pla = icChamber - TMath::Nint((Float_t) (icChamber / 7)) * 6 - 1; | |
82bbf98a | 679 | |
5c7f4665 | 680 | // Check on selected volumes |
681 | Int_t addthishit = 1; | |
682 | if (fSensSelect) { | |
6f1e466d | 683 | if ((fSensPlane >= 0) && (pla != fSensPlane )) addthishit = 0; |
684 | if ((fSensChamber >= 0) && (cha != fSensChamber)) addthishit = 0; | |
9d0b222b | 685 | if (fSensSector >= 0) { |
686 | Int_t sens1 = fSensSector; | |
687 | Int_t sens2 = fSensSector + fSensSectorRange; | |
793ff80c | 688 | sens2 -= ((Int_t) (sens2 / AliTRDgeometry::Nsect())) |
689 | * AliTRDgeometry::Nsect(); | |
9d0b222b | 690 | if (sens1 < sens2) { |
691 | if ((sec < sens1) || (sec >= sens2)) addthishit = 0; | |
692 | } | |
693 | else { | |
694 | if ((sec < sens1) && (sec >= sens2)) addthishit = 0; | |
695 | } | |
696 | } | |
5c7f4665 | 697 | } |
698 | ||
699 | // Add this hit | |
700 | if (addthishit) { | |
701 | ||
793ff80c | 702 | det = fGeometry->GetDetector(pla,cha,sec); |
703 | ||
704 | // Create the electron cluster from TR photons | |
705 | if (fTR) CreateTRhit(det); | |
706 | ||
851d3db9 | 707 | new(lhits[fNhits++]) AliTRDhit(fIshunt |
708 | ,gAlice->CurrentTrack() | |
9d0b222b | 709 | ,det |
793ff80c | 710 | ,hits |
711 | ,qTot); | |
5c7f4665 | 712 | |
713 | // The energy loss according to Bethe Bloch | |
714 | gMC->TrackMomentum(mom); | |
715 | pTot = mom.Rho(); | |
851d3db9 | 716 | iPdg = TMath::Abs(gMC->TrackPid()); |
8230f242 | 717 | if ( (iPdg != kPdgElectron) || |
718 | ((iPdg == kPdgElectron) && (pTot < kPTotMax))) { | |
5c7f4665 | 719 | aMass = gMC->TrackMass(); |
720 | betaGamma = pTot / aMass; | |
721 | pp = kPrim * BetheBloch(betaGamma); | |
722 | // Take charge > 1 into account | |
723 | charge = gMC->TrackCharge(); | |
724 | if (TMath::Abs(charge) > 1) pp = pp * charge*charge; | |
725 | } | |
726 | // Electrons above 20 Mev/c are at the plateau | |
727 | else { | |
728 | pp = kPrim * kPlateau; | |
729 | } | |
730 | ||
731 | // Calculate the maximum step size for the next tracking step | |
732 | if (pp > 0) { | |
733 | do | |
734 | gMC->Rndm(random,1); | |
735 | while ((random[0] == 1.) || (random[0] == 0.)); | |
736 | gMC->SetMaxStep( - TMath::Log(random[0]) / pp); | |
737 | } | |
738 | ||
739 | } | |
740 | else { | |
741 | // set step size to maximal value | |
742 | gMC->SetMaxStep(kBig); | |
743 | } | |
d3f347ff | 744 | |
745 | } | |
746 | ||
5c7f4665 | 747 | } |
748 | ||
749 | } | |
750 | ||
751 | //_____________________________________________________________________________ | |
752 | Double_t AliTRDv1::BetheBloch(Double_t bg) | |
753 | { | |
754 | // | |
755 | // Parametrization of the Bethe-Bloch-curve | |
756 | // The parametrization is the same as for the TPC and is taken from Lehrhaus. | |
757 | // | |
758 | ||
759 | // This parameters have been adjusted to averaged values from GEANT | |
760 | const Double_t kP1 = 7.17960e-02; | |
761 | const Double_t kP2 = 8.54196; | |
762 | const Double_t kP3 = 1.38065e-06; | |
763 | const Double_t kP4 = 5.30972; | |
764 | const Double_t kP5 = 2.83798; | |
765 | ||
766 | // This parameters have been adjusted to Xe-data found in: | |
767 | // Allison & Cobb, Ann. Rev. Nucl. Sci. (1980), 30, 253 | |
768 | //const Double_t kP1 = 0.76176E-1; | |
769 | //const Double_t kP2 = 10.632; | |
770 | //const Double_t kP3 = 3.17983E-6; | |
771 | //const Double_t kP4 = 1.8631; | |
772 | //const Double_t kP5 = 1.9479; | |
773 | ||
774 | if (bg > 0) { | |
775 | Double_t yy = bg / TMath::Sqrt(1. + bg*bg); | |
776 | Double_t aa = TMath::Power(yy,kP4); | |
777 | Double_t bb = TMath::Power((1./bg),kP5); | |
778 | bb = TMath::Log(kP3 + bb); | |
779 | return ((kP2 - aa - bb)*kP1 / aa); | |
780 | } | |
781 | else | |
782 | return 0; | |
d3f347ff | 783 | |
fe4da5cc | 784 | } |
5c7f4665 | 785 | |
786 | //_____________________________________________________________________________ | |
787 | Double_t Ermilova(Double_t *x, Double_t *) | |
788 | { | |
789 | // | |
790 | // Calculates the delta-ray energy distribution according to Ermilova. | |
791 | // Logarithmic scale ! | |
792 | // | |
793 | ||
794 | Double_t energy; | |
795 | Double_t dpos; | |
796 | Double_t dnde; | |
797 | ||
798 | Int_t pos1, pos2; | |
799 | ||
8230f242 | 800 | const Int_t kNv = 31; |
5c7f4665 | 801 | |
8230f242 | 802 | Float_t vxe[kNv] = { 2.3026, 2.9957, 3.4012, 3.6889, 3.9120 |
803 | , 4.0943, 4.2485, 4.3820, 4.4998, 4.6052 | |
804 | , 4.7005, 5.0752, 5.2983, 5.7038, 5.9915 | |
805 | , 6.2146, 6.5221, 6.9078, 7.3132, 7.6009 | |
806 | , 8.0064, 8.5172, 8.6995, 8.9872, 9.2103 | |
807 | , 9.4727, 9.9035,10.3735,10.5966,10.8198 | |
808 | ,11.5129 }; | |
5c7f4665 | 809 | |
8230f242 | 810 | Float_t vye[kNv] = { 80.0 , 31.0 , 23.3 , 21.1 , 21.0 |
811 | , 20.9 , 20.8 , 20.0 , 16.0 , 11.0 | |
812 | , 8.0 , 6.0 , 5.2 , 4.6 , 4.0 | |
813 | , 3.5 , 3.0 , 1.4 , 0.67 , 0.44 | |
814 | , 0.3 , 0.18 , 0.12 , 0.08 , 0.056 | |
815 | , 0.04 , 0.023, 0.015, 0.011, 0.01 | |
816 | , 0.004 }; | |
5c7f4665 | 817 | |
818 | energy = x[0]; | |
819 | ||
820 | // Find the position | |
821 | pos1 = pos2 = 0; | |
822 | dpos = 0; | |
823 | do { | |
824 | dpos = energy - vxe[pos2++]; | |
825 | } | |
826 | while (dpos > 0); | |
827 | pos2--; | |
8230f242 | 828 | if (pos2 > kNv) pos2 = kNv; |
5c7f4665 | 829 | pos1 = pos2 - 1; |
830 | ||
831 | // Differentiate between the sampling points | |
832 | dnde = (vye[pos1] - vye[pos2]) / (vxe[pos2] - vxe[pos1]); | |
833 | ||
834 | return dnde; | |
835 | ||
836 | } |