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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; | |
c4214bc0 | 69 | fTypeOfStepManager = 1; |
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; | |
c4214bc0 | 91 | fTypeOfStepManager = 1; |
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 | { |
c4214bc0 | 136 | printf("void AliTRDv1::Copy(TObject &trd) const\n"); |
8230f242 | 137 | // |
138 | // Copy function | |
139 | // | |
140 | ||
a328fff9 | 141 | ((AliTRDv1 &) trd).fSensSelect = fSensSelect; |
142 | ((AliTRDv1 &) trd).fSensPlane = fSensPlane; | |
143 | ((AliTRDv1 &) trd).fSensChamber = fSensChamber; | |
144 | ((AliTRDv1 &) trd).fSensSector = fSensSector; | |
145 | ((AliTRDv1 &) trd).fSensSectorRange = fSensSectorRange; | |
146 | ||
147 | ((AliTRDv1 &) trd).fTypeOfStepManager = fTypeOfStepManager; | |
148 | ((AliTRDv1 &) trd).fStepSize = fStepSize; | |
8230f242 | 149 | |
793ff80c | 150 | fDeltaE->Copy(*((AliTRDv1 &) trd).fDeltaE); |
a328fff9 | 151 | fDeltaG->Copy(*((AliTRDv1 &) trd).fDeltaG); |
793ff80c | 152 | fTR->Copy(*((AliTRDv1 &) trd).fTR); |
8230f242 | 153 | |
154 | } | |
155 | ||
fe4da5cc | 156 | //_____________________________________________________________________________ |
157 | void AliTRDv1::CreateGeometry() | |
158 | { | |
159 | // | |
851d3db9 | 160 | // Create the GEANT geometry for the Transition Radiation Detector - Version 1 |
5c7f4665 | 161 | // This version covers the full azimuth. |
d3f347ff | 162 | // |
163 | ||
82bbf98a | 164 | // Check that FRAME is there otherwise we have no place where to put the TRD |
8230f242 | 165 | AliModule* frame = gAlice->GetModule("FRAME"); |
166 | if (!frame) return; | |
d3f347ff | 167 | |
82bbf98a | 168 | // Define the chambers |
169 | AliTRD::CreateGeometry(); | |
d3f347ff | 170 | |
fe4da5cc | 171 | } |
172 | ||
173 | //_____________________________________________________________________________ | |
174 | void AliTRDv1::CreateMaterials() | |
175 | { | |
176 | // | |
851d3db9 | 177 | // Create materials for the Transition Radiation Detector version 1 |
fe4da5cc | 178 | // |
82bbf98a | 179 | |
d3f347ff | 180 | AliTRD::CreateMaterials(); |
82bbf98a | 181 | |
fe4da5cc | 182 | } |
183 | ||
793ff80c | 184 | //_____________________________________________________________________________ |
185 | void AliTRDv1::CreateTRhit(Int_t det) | |
186 | { | |
187 | // | |
188 | // Creates an electron cluster from a TR photon. | |
189 | // The photon is assumed to be created a the end of the radiator. The | |
190 | // distance after which it deposits its energy takes into account the | |
191 | // absorbtion of the entrance window and of the gas mixture in drift | |
192 | // volume. | |
193 | // | |
194 | ||
195 | // PDG code electron | |
196 | const Int_t kPdgElectron = 11; | |
197 | ||
198 | // Ionization energy | |
bc327ce2 | 199 | const Float_t kWion = 23.53; |
793ff80c | 200 | |
201 | // Maximum number of TR photons per track | |
202 | const Int_t kNTR = 50; | |
203 | ||
204 | TLorentzVector mom, pos; | |
793ff80c | 205 | |
793ff80c | 206 | // Create TR at the entrance of the chamber |
207 | if (gMC->IsTrackEntering()) { | |
208 | ||
f73816f5 | 209 | // Create TR only for electrons |
210 | Int_t iPdg = gMC->TrackPid(); | |
211 | if (TMath::Abs(iPdg) != kPdgElectron) return; | |
212 | ||
793ff80c | 213 | Float_t eTR[kNTR]; |
214 | Int_t nTR; | |
215 | ||
216 | // Create TR photons | |
217 | gMC->TrackMomentum(mom); | |
218 | Float_t pTot = mom.Rho(); | |
219 | fTR->CreatePhotons(iPdg,pTot,nTR,eTR); | |
220 | if (nTR > kNTR) { | |
45160b1f | 221 | AliFatal(Form("Boundary error: nTR = %d, kNTR = %d",nTR,kNTR)); |
793ff80c | 222 | } |
223 | ||
224 | // Loop through the TR photons | |
225 | for (Int_t iTR = 0; iTR < nTR; iTR++) { | |
226 | ||
227 | Float_t energyMeV = eTR[iTR] * 0.001; | |
228 | Float_t energyeV = eTR[iTR] * 1000.0; | |
229 | Float_t absLength = 0; | |
230 | Float_t sigma = 0; | |
231 | ||
232 | // Take the absorbtion in the entrance window into account | |
233 | Double_t muMy = fTR->GetMuMy(energyMeV); | |
234 | sigma = muMy * fFoilDensity; | |
842287f2 | 235 | if (sigma > 0.0) { |
236 | absLength = gRandom->Exp(1.0/sigma); | |
237 | if (absLength < AliTRDgeometry::MyThick()) continue; | |
238 | } | |
239 | else { | |
240 | continue; | |
241 | } | |
793ff80c | 242 | |
243 | // The absorbtion cross sections in the drift gas | |
3dac2b2d | 244 | // Gas-mixture (Xe/CO2) |
245 | Double_t muXe = fTR->GetMuXe(energyMeV); | |
246 | Double_t muCO = fTR->GetMuCO(energyMeV); | |
247 | sigma = (0.85 * muXe + 0.15 * muCO) * fGasDensity * fTR->GetTemp(); | |
793ff80c | 248 | |
249 | // The distance after which the energy of the TR photon | |
250 | // is deposited. | |
842287f2 | 251 | if (sigma > 0.0) { |
252 | absLength = gRandom->Exp(1.0/sigma); | |
a328fff9 | 253 | if (absLength > (AliTRDgeometry::DrThick() |
254 | + AliTRDgeometry::AmThick())) { | |
255 | continue; | |
256 | } | |
842287f2 | 257 | } |
258 | else { | |
259 | continue; | |
260 | } | |
793ff80c | 261 | |
262 | // The position of the absorbtion | |
263 | Float_t posHit[3]; | |
264 | gMC->TrackPosition(pos); | |
265 | posHit[0] = pos[0] + mom[0] / pTot * absLength; | |
266 | posHit[1] = pos[1] + mom[1] / pTot * absLength; | |
c4214bc0 | 267 | posHit[2] = pos[2] + mom[2] / pTot * absLength; |
793ff80c | 268 | |
269 | // Create the charge | |
270 | Int_t q = ((Int_t) (energyeV / kWion)); | |
271 | ||
272 | // Add the hit to the array. TR photon hits are marked | |
273 | // by negative charge | |
c4214bc0 | 274 | AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(),det,posHit,-q,kTRUE); |
793ff80c | 275 | |
276 | } | |
277 | ||
278 | } | |
279 | ||
280 | } | |
281 | ||
5c7f4665 | 282 | //_____________________________________________________________________________ |
283 | void AliTRDv1::Init() | |
284 | { | |
285 | // | |
286 | // Initialise Transition Radiation Detector after geometry has been built. | |
5c7f4665 | 287 | // |
288 | ||
289 | AliTRD::Init(); | |
290 | ||
45160b1f | 291 | AliDebug(1,"Slow simulator\n"); |
851d3db9 | 292 | if (fSensSelect) { |
293 | if (fSensPlane >= 0) | |
45160b1f | 294 | AliInfo(Form("Only plane %d is sensitive")); |
851d3db9 | 295 | if (fSensChamber >= 0) |
45160b1f | 296 | AliInfo(Form("Only chamber %d is sensitive",fSensChamber)); |
9d0b222b | 297 | if (fSensSector >= 0) { |
298 | Int_t sens1 = fSensSector; | |
299 | Int_t sens2 = fSensSector + fSensSectorRange; | |
793ff80c | 300 | sens2 -= ((Int_t) (sens2 / AliTRDgeometry::Nsect())) |
301 | * AliTRDgeometry::Nsect(); | |
45160b1f | 302 | AliInfo(Form("Only sectors %d - %d are sensitive\n",sens1,sens2-1)); |
9d0b222b | 303 | } |
851d3db9 | 304 | } |
793ff80c | 305 | if (fTR) |
45160b1f | 306 | AliInfo("TR simulation on") |
793ff80c | 307 | else |
45160b1f | 308 | AliInfo("TR simulation off"); |
5c7f4665 | 309 | |
310 | // First ionization potential (eV) for the gas mixture (90% Xe + 10% CO2) | |
311 | const Float_t kPoti = 12.1; | |
312 | // Maximum energy (50 keV); | |
313 | const Float_t kEend = 50000.0; | |
314 | // Ermilova distribution for the delta-ray spectrum | |
8230f242 | 315 | Float_t poti = TMath::Log(kPoti); |
316 | Float_t eEnd = TMath::Log(kEend); | |
a328fff9 | 317 | |
318 | // Ermilova distribution for the delta-ray spectrum | |
c4214bc0 | 319 | fDeltaE = new TF1("deltae" ,Ermilova ,poti,eEnd,0); |
a328fff9 | 320 | |
321 | // Geant3 distribution for the delta-ray spectrum | |
c4214bc0 | 322 | fDeltaG = new TF1("deltag",IntSpecGeant,2.421257,28.536469,0); |
5c7f4665 | 323 | |
45160b1f | 324 | AliDebug(1,"+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++"); |
5c7f4665 | 325 | |
fe4da5cc | 326 | } |
327 | ||
793ff80c | 328 | //_____________________________________________________________________________ |
329 | AliTRDsim *AliTRDv1::CreateTR() | |
330 | { | |
331 | // | |
332 | // Enables the simulation of TR | |
333 | // | |
334 | ||
335 | fTR = new AliTRDsim(); | |
336 | return fTR; | |
337 | ||
338 | } | |
339 | ||
5c7f4665 | 340 | //_____________________________________________________________________________ |
341 | void AliTRDv1::SetSensPlane(Int_t iplane) | |
342 | { | |
343 | // | |
851d3db9 | 344 | // Defines the hit-sensitive plane (0-5) |
5c7f4665 | 345 | // |
82bbf98a | 346 | |
851d3db9 | 347 | if ((iplane < 0) || (iplane > 5)) { |
45160b1f | 348 | AliWarning(Form("Wrong input value:%d",iplane)); |
349 | AliWarning("Use standard setting"); | |
851d3db9 | 350 | fSensPlane = -1; |
351 | fSensSelect = 0; | |
5c7f4665 | 352 | return; |
353 | } | |
82bbf98a | 354 | |
5c7f4665 | 355 | fSensSelect = 1; |
356 | fSensPlane = iplane; | |
82bbf98a | 357 | |
5c7f4665 | 358 | } |
359 | ||
360 | //_____________________________________________________________________________ | |
361 | void AliTRDv1::SetSensChamber(Int_t ichamber) | |
362 | { | |
363 | // | |
851d3db9 | 364 | // Defines the hit-sensitive chamber (0-4) |
5c7f4665 | 365 | // |
366 | ||
851d3db9 | 367 | if ((ichamber < 0) || (ichamber > 4)) { |
45160b1f | 368 | AliWarning(Form("Wrong input value: %d",ichamber)); |
369 | AliWarning("Use standard setting"); | |
851d3db9 | 370 | fSensChamber = -1; |
371 | fSensSelect = 0; | |
5c7f4665 | 372 | return; |
373 | } | |
374 | ||
375 | fSensSelect = 1; | |
376 | fSensChamber = ichamber; | |
377 | ||
378 | } | |
379 | ||
380 | //_____________________________________________________________________________ | |
381 | void AliTRDv1::SetSensSector(Int_t isector) | |
382 | { | |
383 | // | |
851d3db9 | 384 | // Defines the hit-sensitive sector (0-17) |
5c7f4665 | 385 | // |
386 | ||
9d0b222b | 387 | SetSensSector(isector,1); |
388 | ||
389 | } | |
390 | ||
391 | //_____________________________________________________________________________ | |
392 | void AliTRDv1::SetSensSector(Int_t isector, Int_t nsector) | |
393 | { | |
394 | // | |
395 | // Defines a range of hit-sensitive sectors. The range is defined by | |
396 | // <isector> (0-17) as the starting point and <nsector> as the number | |
397 | // of sectors to be included. | |
398 | // | |
399 | ||
851d3db9 | 400 | if ((isector < 0) || (isector > 17)) { |
45160b1f | 401 | AliWarning(Form("Wrong input value <isector>: %d",isector)); |
402 | AliWarning("Use standard setting"); | |
9d0b222b | 403 | fSensSector = -1; |
404 | fSensSectorRange = 0; | |
405 | fSensSelect = 0; | |
5c7f4665 | 406 | return; |
407 | } | |
408 | ||
9d0b222b | 409 | if ((nsector < 1) || (nsector > 18)) { |
45160b1f | 410 | AliWarning(Form("Wrong input value <nsector>: %d",nsector)); |
411 | AliWarning("Use standard setting"); | |
9d0b222b | 412 | fSensSector = -1; |
413 | fSensSectorRange = 0; | |
414 | fSensSelect = 0; | |
415 | return; | |
416 | } | |
417 | ||
418 | fSensSelect = 1; | |
419 | fSensSector = isector; | |
420 | fSensSectorRange = nsector; | |
5c7f4665 | 421 | |
422 | } | |
423 | ||
424 | //_____________________________________________________________________________ | |
425 | void AliTRDv1::StepManager() | |
a328fff9 | 426 | { |
427 | // | |
c4214bc0 | 428 | // Slow simulator. Every charged track produces electron cluster as hits |
a328fff9 | 429 | // along its path across the drift volume. |
430 | // | |
431 | ||
432 | switch (fTypeOfStepManager) { | |
433 | case 0 : StepManagerErmilova(); break; // 0 is Ermilova | |
434 | case 1 : StepManagerGeant(); break; // 1 is Geant | |
435 | case 2 : StepManagerFixedStep(); break; // 2 is fixed step | |
45160b1f | 436 | default : AliWarning("Not a valid Step Manager."); |
a328fff9 | 437 | } |
438 | ||
439 | } | |
440 | ||
441 | //_____________________________________________________________________________ | |
442 | void AliTRDv1::SelectStepManager(Int_t t) | |
443 | { | |
444 | // | |
445 | // Selects a step manager type: | |
446 | // 0 - Ermilova | |
447 | // 1 - Geant3 | |
448 | // 2 - Fixed step size | |
449 | // | |
450 | ||
c4214bc0 | 451 | /* if (t == 1) { |
45160b1f | 452 | AliWarning("Sorry, Geant parametrization step manager is not implemented yet. Please ask K.Oyama for detail."); |
a328fff9 | 453 | } |
c4214bc0 | 454 | */ |
a328fff9 | 455 | fTypeOfStepManager = t; |
45160b1f | 456 | AliInfo(Form("Step Manager type %d was selected",fTypeOfStepManager)); |
a328fff9 | 457 | |
458 | } | |
459 | ||
460 | //_____________________________________________________________________________ | |
461 | void AliTRDv1::StepManagerGeant() | |
462 | { | |
463 | // | |
c4214bc0 | 464 | // Slow simulator. Every charged track produces electron cluster as hits |
a328fff9 | 465 | // along its path across the drift volume. The step size is set acording |
466 | // to Bethe-Bloch. The energy distribution of the delta electrons follows | |
467 | // a spectrum taken from Geant3. | |
468 | // | |
c4214bc0 | 469 | Int_t pla = 0; |
470 | Int_t cha = 0; | |
471 | Int_t sec = 0; | |
472 | Int_t det = 0; | |
473 | Int_t iPdg; | |
474 | Int_t qTot; | |
475 | ||
476 | Float_t hits[3]; | |
477 | Float_t charge; | |
478 | Float_t aMass; | |
479 | ||
480 | Double_t pTot = 0; | |
481 | Double_t eDelta; | |
482 | Double_t betaGamma, pp; | |
483 | Double_t stepSize=0; | |
484 | ||
485 | Bool_t drRegion = kFALSE; | |
486 | Bool_t amRegion = kFALSE; | |
487 | ||
488 | TString cIdCurrent; | |
489 | TString cIdSensDr = "J"; | |
490 | TString cIdSensAm = "K"; | |
491 | Char_t cIdChamber[3]; | |
492 | cIdChamber[2] = 0; | |
493 | ||
494 | TLorentzVector pos, mom; | |
495 | ||
496 | const Int_t kNplan = AliTRDgeometry::Nplan(); | |
497 | const Int_t kNcham = AliTRDgeometry::Ncham(); | |
498 | const Int_t kNdetsec = kNplan * kNcham; | |
499 | ||
500 | const Double_t kBig = 1.0E+12; // Infinitely big | |
bc327ce2 | 501 | const Float_t kWion = 23.53; // Ionization energy |
c4214bc0 | 502 | const Float_t kPTotMaxEl = 0.002; // Maximum momentum for e+ e- g |
503 | ||
504 | // Minimum energy for the step size adjustment | |
505 | const Float_t kEkinMinStep = 1.0e-5; | |
506 | // energy threshold for production of delta electrons | |
507 | const Float_t kECut = 1.0e4; | |
508 | // Parameters entering the parametrized range for delta electrons | |
509 | const float ra=5.37E-4, rb=0.9815, rc=3.123E-3; | |
510 | // Gas density -> To be made user adjustable ! | |
511 | const float rho=0.004945 ; //[0.85*0.00549+0.15*0.00186 (Xe-CO2 85-15)] | |
a328fff9 | 512 | |
c4214bc0 | 513 | // Plateau value of the energy-loss for electron in xenon |
514 | // taken from: Allison + Comb, Ann. Rev. Nucl. Sci. (1980), 30, 253 | |
515 | //const Double_t kPlateau = 1.70; | |
516 | // the averaged value (26/3/99) | |
517 | const Float_t kPlateau = 1.55; | |
518 | ||
519 | const Float_t kPrim = 19.34; // dN1/dx|min for the gas mixture (90% Xe + 10% CO2) | |
520 | // First ionization potential (eV) for the gas mixture (90% Xe + 10% CO2) | |
521 | const Float_t kPoti = 12.1; | |
522 | ||
523 | const Int_t kPdgElectron = 11; // PDG code electron | |
524 | ||
525 | // Set the maximum step size to a very large number for all | |
526 | // neutral particles and those outside the driftvolume | |
527 | gMC->SetMaxStep(kBig); | |
528 | ||
529 | // Use only charged tracks | |
530 | if (( gMC->TrackCharge() ) && | |
531 | (!gMC->IsTrackStop() ) && | |
532 | (!gMC->IsTrackDisappeared())) { | |
533 | ||
534 | // Inside a sensitive volume? | |
535 | drRegion = kFALSE; | |
536 | amRegion = kFALSE; | |
537 | cIdCurrent = gMC->CurrentVolName(); | |
538 | if (cIdSensDr == cIdCurrent[1]) { | |
539 | drRegion = kTRUE; | |
540 | } | |
541 | if (cIdSensAm == cIdCurrent[1]) { | |
542 | amRegion = kTRUE; | |
543 | } | |
544 | if (drRegion || amRegion) { | |
a328fff9 | 545 | |
c4214bc0 | 546 | // The hit coordinates and charge |
547 | gMC->TrackPosition(pos); | |
548 | hits[0] = pos[0]; | |
549 | hits[1] = pos[1]; | |
550 | hits[2] = pos[2]; | |
551 | ||
552 | // The sector number (0 - 17) | |
553 | // The numbering goes clockwise and starts at y = 0 | |
554 | Float_t phi = kRaddeg*TMath::ATan2(pos[0],pos[1]); | |
555 | if (phi < 90.) | |
556 | phi = phi + 270.; | |
557 | else | |
558 | phi = phi - 90.; | |
559 | sec = ((Int_t) (phi / 20)); | |
560 | ||
561 | // The plane and chamber number | |
562 | cIdChamber[0] = cIdCurrent[2]; | |
563 | cIdChamber[1] = cIdCurrent[3]; | |
564 | Int_t idChamber = (atoi(cIdChamber) % kNdetsec); | |
565 | cha = kNcham - ((Int_t) idChamber / kNplan) - 1; | |
566 | pla = ((Int_t) idChamber % kNplan); | |
567 | ||
568 | // Check on selected volumes | |
569 | Int_t addthishit = 1; | |
570 | if (fSensSelect) { | |
571 | if ((fSensPlane >= 0) && (pla != fSensPlane )) addthishit = 0; | |
572 | if ((fSensChamber >= 0) && (cha != fSensChamber)) addthishit = 0; | |
573 | if (fSensSector >= 0) { | |
574 | Int_t sens1 = fSensSector; | |
575 | Int_t sens2 = fSensSector + fSensSectorRange; | |
576 | sens2 -= ((Int_t) (sens2 / AliTRDgeometry::Nsect())) | |
577 | * AliTRDgeometry::Nsect(); | |
578 | if (sens1 < sens2) { | |
579 | if ((sec < sens1) || (sec >= sens2)) addthishit = 0; | |
580 | } | |
581 | else { | |
582 | if ((sec < sens1) && (sec >= sens2)) addthishit = 0; | |
583 | } | |
584 | } | |
585 | } | |
586 | ||
587 | // Add this hit | |
588 | if (addthishit) { | |
589 | ||
590 | // The detector number | |
591 | det = fGeometry->GetDetector(pla,cha,sec); | |
592 | ||
593 | // Special hits only in the drift region | |
594 | if (drRegion) { | |
595 | // Create a track reference at the entrance and | |
596 | // exit of each chamber that contain the | |
597 | // momentum components of the particle | |
598 | if (gMC->IsTrackEntering() || gMC->IsTrackExiting()) { | |
599 | gMC->TrackMomentum(mom); | |
600 | AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber()); | |
601 | } | |
602 | ||
603 | if (gMC->IsTrackEntering() && !gMC->IsNewTrack()) { | |
604 | // determine if hit belong to primary track | |
605 | fPrimaryTrackPid=gAlice->GetMCApp()->GetCurrentTrackNumber(); | |
606 | //determine track length when entering the detector | |
607 | fTrackLength0=gMC->TrackLength(); | |
608 | } | |
609 | ||
610 | // Create the hits from TR photons | |
611 | if (fTR) CreateTRhit(det); | |
612 | } | |
613 | ||
614 | // Calculate the energy of the delta-electrons | |
615 | // modified by Alex Bercuci (A.Bercuci@gsi.de) on 26.01.06 | |
616 | // take into account correlation with the underlying GEANT tracking | |
617 | // mechanism. see | |
618 | // http://www-linux.gsi.de/~abercuci/Contributions/TRD/index.html | |
619 | ||
620 | // determine the most significant process (last on the processes list) | |
621 | // which caused this hit | |
622 | TArrayI processes; | |
623 | gMC->StepProcesses(processes); | |
624 | int nofprocesses=processes.GetSize(), pid; | |
625 | if(!nofprocesses) pid=0; | |
626 | else pid= processes[nofprocesses-1]; | |
627 | ||
628 | // generate Edep according to GEANT parametrisation | |
629 | eDelta =TMath::Exp(fDeltaG->GetRandom()) - kPoti; | |
630 | eDelta=TMath::Max(eDelta,0.0); | |
631 | float pr_range=0.; | |
632 | float range=gMC->TrackLength()-fTrackLength0; | |
633 | // merge GEANT tracker information with localy cooked one | |
634 | if(gAlice->GetMCApp()->GetCurrentTrackNumber()==fPrimaryTrackPid) { | |
635 | // printf("primary pid=%d eDelta=%f\n",pid,eDelta); | |
636 | if(pid==27){ | |
637 | if(eDelta>=kECut){ | |
638 | pr_range=ra*eDelta*.001*(1.-rb/(1.+rc*eDelta*0.001))/rho; | |
639 | if(pr_range>=(3.7-range)) eDelta*=.1; | |
640 | } | |
641 | } else if(pid==1){ | |
642 | if(eDelta<kECut) eDelta*=.5; | |
643 | else { | |
644 | pr_range=ra*eDelta*.001*(1.-rb/(1.+rc*eDelta*0.001))/rho; | |
645 | if(pr_range>=((AliTRDgeometry::DrThick() | |
646 | + AliTRDgeometry::AmThick())-range)) eDelta*=.05; | |
647 | else eDelta*=.5; | |
648 | } | |
649 | } else eDelta=0.; | |
650 | } else eDelta=0.; | |
651 | ||
652 | // Generate the electron cluster size | |
653 | if(eDelta==0.) qTot=0; | |
654 | else qTot = ((Int_t) (eDelta / kWion) + 1); | |
655 | // Create a new dEdx hit | |
656 | AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(),det,hits,qTot, drRegion); | |
657 | ||
658 | // Calculate the maximum step size for the next tracking step | |
659 | // Produce only one hit if Ekin is below cutoff | |
660 | aMass = gMC->TrackMass(); | |
661 | if ((gMC->Etot() - aMass) > kEkinMinStep) { | |
662 | ||
663 | // The energy loss according to Bethe Bloch | |
664 | iPdg = TMath::Abs(gMC->TrackPid()); | |
665 | if ( (iPdg != kPdgElectron) || | |
666 | ((iPdg == kPdgElectron) && (pTot < kPTotMaxEl))) { | |
667 | gMC->TrackMomentum(mom); | |
668 | pTot = mom.Rho(); | |
669 | betaGamma = pTot / aMass; | |
670 | pp = BetheBlochGeant(betaGamma); | |
671 | // Take charge > 1 into account | |
672 | charge = gMC->TrackCharge(); | |
673 | if (TMath::Abs(charge) > 1) pp = pp * charge*charge; | |
674 | } else { // Electrons above 20 Mev/c are at the plateau | |
675 | pp = kPrim * kPlateau; | |
676 | } | |
677 | ||
1b775a44 | 678 | Int_t nsteps = 0; |
679 | do {nsteps = gRandom->Poisson(pp);} while(!nsteps); | |
680 | stepSize = 1./nsteps; | |
681 | gMC->SetMaxStep(stepSize); | |
682 | } | |
c4214bc0 | 683 | } |
684 | } | |
685 | } | |
a328fff9 | 686 | } |
687 | ||
688 | //_____________________________________________________________________________ | |
689 | void AliTRDv1::StepManagerErmilova() | |
5c7f4665 | 690 | { |
691 | // | |
5c7f4665 | 692 | // Slow simulator. Every charged track produces electron cluster as hits |
693 | // along its path across the drift volume. The step size is set acording | |
694 | // to Bethe-Bloch. The energy distribution of the delta electrons follows | |
695 | // a spectrum taken from Ermilova et al. | |
696 | // | |
697 | ||
851d3db9 | 698 | Int_t pla = 0; |
699 | Int_t cha = 0; | |
700 | Int_t sec = 0; | |
793ff80c | 701 | Int_t det = 0; |
851d3db9 | 702 | Int_t iPdg; |
793ff80c | 703 | Int_t qTot; |
5c7f4665 | 704 | |
793ff80c | 705 | Float_t hits[3]; |
a5cadd36 | 706 | Double_t random[1]; |
5c7f4665 | 707 | Float_t charge; |
708 | Float_t aMass; | |
709 | ||
f73816f5 | 710 | Double_t pTot = 0; |
5c7f4665 | 711 | Double_t eDelta; |
712 | Double_t betaGamma, pp; | |
f73816f5 | 713 | Double_t stepSize; |
5c7f4665 | 714 | |
332e9569 | 715 | Bool_t drRegion = kFALSE; |
716 | Bool_t amRegion = kFALSE; | |
717 | ||
718 | TString cIdCurrent; | |
719 | TString cIdSensDr = "J"; | |
720 | TString cIdSensAm = "K"; | |
593a9fc3 | 721 | Char_t cIdChamber[3]; |
722 | cIdChamber[2] = 0; | |
332e9569 | 723 | |
5c7f4665 | 724 | TLorentzVector pos, mom; |
82bbf98a | 725 | |
332e9569 | 726 | const Int_t kNplan = AliTRDgeometry::Nplan(); |
e644678a | 727 | const Int_t kNcham = AliTRDgeometry::Ncham(); |
728 | const Int_t kNdetsec = kNplan * kNcham; | |
729 | ||
a328fff9 | 730 | const Double_t kBig = 1.0E+12; // Infinitely big |
bc327ce2 | 731 | const Float_t kWion = 23.53; // Ionization energy |
a328fff9 | 732 | const Float_t kPTotMaxEl = 0.002; // Maximum momentum for e+ e- g |
5c7f4665 | 733 | |
c4214bc0 | 734 | // energy threshold for production of delta electrons |
735 | //const Float_t kECut = 1.0e4; | |
736 | // Parameters entering the parametrized range for delta electrons | |
737 | //const float ra=5.37E-4, rb=0.9815, rc=3.123E-3; | |
738 | // Gas density -> To be made user adjustable ! | |
739 | //const float rho=0.004945 ; //[0.85*0.00549+0.15*0.00186 (Xe-CO2 85-15)] | |
740 | ||
f73816f5 | 741 | // Minimum energy for the step size adjustment |
742 | const Float_t kEkinMinStep = 1.0e-5; | |
a328fff9 | 743 | |
5c7f4665 | 744 | // Plateau value of the energy-loss for electron in xenon |
745 | // taken from: Allison + Comb, Ann. Rev. Nucl. Sci. (1980), 30, 253 | |
746 | //const Double_t kPlateau = 1.70; | |
747 | // the averaged value (26/3/99) | |
a3c76cdc | 748 | const Float_t kPlateau = 1.55; |
a328fff9 | 749 | |
750 | const Float_t kPrim = 48.0; // dN1/dx|min for the gas mixture (90% Xe + 10% CO2) | |
5c7f4665 | 751 | // First ionization potential (eV) for the gas mixture (90% Xe + 10% CO2) |
a3c76cdc | 752 | const Float_t kPoti = 12.1; |
851d3db9 | 753 | |
a328fff9 | 754 | const Int_t kPdgElectron = 11; // PDG code electron |
5c7f4665 | 755 | |
756 | // Set the maximum step size to a very large number for all | |
757 | // neutral particles and those outside the driftvolume | |
758 | gMC->SetMaxStep(kBig); | |
759 | ||
760 | // Use only charged tracks | |
761 | if (( gMC->TrackCharge() ) && | |
762 | (!gMC->IsTrackStop() ) && | |
763 | (!gMC->IsTrackDisappeared())) { | |
fe4da5cc | 764 | |
5c7f4665 | 765 | // Inside a sensitive volume? |
332e9569 | 766 | drRegion = kFALSE; |
767 | amRegion = kFALSE; | |
768 | cIdCurrent = gMC->CurrentVolName(); | |
e6674585 | 769 | if (cIdSensDr == cIdCurrent[1]) { |
332e9569 | 770 | drRegion = kTRUE; |
771 | } | |
e6674585 | 772 | if (cIdSensAm == cIdCurrent[1]) { |
332e9569 | 773 | amRegion = kTRUE; |
774 | } | |
775 | if (drRegion || amRegion) { | |
fe4da5cc | 776 | |
5c7f4665 | 777 | // The hit coordinates and charge |
778 | gMC->TrackPosition(pos); | |
779 | hits[0] = pos[0]; | |
780 | hits[1] = pos[1]; | |
781 | hits[2] = pos[2]; | |
5c7f4665 | 782 | |
851d3db9 | 783 | // The sector number (0 - 17) |
784 | // The numbering goes clockwise and starts at y = 0 | |
e15eb584 | 785 | Float_t phi = kRaddeg*TMath::ATan2(pos[0],pos[1]); |
851d3db9 | 786 | if (phi < 90.) |
787 | phi = phi + 270.; | |
788 | else | |
789 | phi = phi - 90.; | |
790 | sec = ((Int_t) (phi / 20)); | |
82bbf98a | 791 | |
332e9569 | 792 | // The plane and chamber number |
793 | cIdChamber[0] = cIdCurrent[2]; | |
794 | cIdChamber[1] = cIdCurrent[3]; | |
e644678a | 795 | Int_t idChamber = (atoi(cIdChamber) % kNdetsec); |
a5cadd36 | 796 | cha = kNcham - ((Int_t) idChamber / kNplan) - 1; |
332e9569 | 797 | pla = ((Int_t) idChamber % kNplan); |
82bbf98a | 798 | |
5c7f4665 | 799 | // Check on selected volumes |
800 | Int_t addthishit = 1; | |
801 | if (fSensSelect) { | |
6f1e466d | 802 | if ((fSensPlane >= 0) && (pla != fSensPlane )) addthishit = 0; |
803 | if ((fSensChamber >= 0) && (cha != fSensChamber)) addthishit = 0; | |
9d0b222b | 804 | if (fSensSector >= 0) { |
805 | Int_t sens1 = fSensSector; | |
806 | Int_t sens2 = fSensSector + fSensSectorRange; | |
793ff80c | 807 | sens2 -= ((Int_t) (sens2 / AliTRDgeometry::Nsect())) |
808 | * AliTRDgeometry::Nsect(); | |
9d0b222b | 809 | if (sens1 < sens2) { |
810 | if ((sec < sens1) || (sec >= sens2)) addthishit = 0; | |
c4214bc0 | 811 | } |
9d0b222b | 812 | else { |
813 | if ((sec < sens1) && (sec >= sens2)) addthishit = 0; | |
c4214bc0 | 814 | } |
815 | } | |
5c7f4665 | 816 | } |
817 | ||
818 | // Add this hit | |
819 | if (addthishit) { | |
820 | ||
f73816f5 | 821 | // The detector number |
793ff80c | 822 | det = fGeometry->GetDetector(pla,cha,sec); |
823 | ||
a328fff9 | 824 | // Special hits only in the drift region |
332e9569 | 825 | if (drRegion) { |
f73816f5 | 826 | |
c61f1a66 | 827 | // Create a track reference at the entrance and |
828 | // exit of each chamber that contain the | |
829 | // momentum components of the particle | |
f73816f5 | 830 | if (gMC->IsTrackEntering() || gMC->IsTrackExiting()) { |
831 | gMC->TrackMomentum(mom); | |
5d12ce38 | 832 | AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber()); |
f73816f5 | 833 | } |
f73816f5 | 834 | // Create the hits from TR photons |
835 | if (fTR) CreateTRhit(det); | |
c4214bc0 | 836 | } |
f73816f5 | 837 | |
f73816f5 | 838 | |
839 | // Calculate the energy of the delta-electrons | |
840 | eDelta = TMath::Exp(fDeltaE->GetRandom()) - kPoti; | |
841 | eDelta = TMath::Max(eDelta,0.0); | |
c4214bc0 | 842 | // Generate the electron cluster size |
843 | if(eDelta==0.) qTot=0; | |
844 | else qTot = ((Int_t) (eDelta / kWion) + 1); | |
f73816f5 | 845 | |
c4214bc0 | 846 | // Create a new dEdx hit |
332e9569 | 847 | if (drRegion) { |
a328fff9 | 848 | AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber() |
c4214bc0 | 849 | ,det,hits,qTot, kTRUE); |
850 | } | |
5c7f4665 | 851 | else { |
a328fff9 | 852 | AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber() |
c4214bc0 | 853 | ,det,hits,qTot,kFALSE); |
854 | } | |
f73816f5 | 855 | |
5c7f4665 | 856 | // Calculate the maximum step size for the next tracking step |
f73816f5 | 857 | // Produce only one hit if Ekin is below cutoff |
858 | aMass = gMC->TrackMass(); | |
859 | if ((gMC->Etot() - aMass) > kEkinMinStep) { | |
860 | ||
861 | // The energy loss according to Bethe Bloch | |
862 | iPdg = TMath::Abs(gMC->TrackPid()); | |
863 | if ( (iPdg != kPdgElectron) || | |
c4214bc0 | 864 | ((iPdg == kPdgElectron) && (pTot < kPTotMaxEl))) { |
f73816f5 | 865 | gMC->TrackMomentum(mom); |
866 | pTot = mom.Rho(); | |
867 | betaGamma = pTot / aMass; | |
868 | pp = kPrim * BetheBloch(betaGamma); | |
869 | // Take charge > 1 into account | |
870 | charge = gMC->TrackCharge(); | |
871 | if (TMath::Abs(charge) > 1) pp = pp * charge*charge; | |
c4214bc0 | 872 | } else { // Electrons above 20 Mev/c are at the plateau |
873 | pp = kPrim * kPlateau; | |
f73816f5 | 874 | } |
875 | ||
876 | if (pp > 0) { | |
877 | do | |
b9d0a01d | 878 | gMC->GetRandom()->RndmArray(1, random); |
f73816f5 | 879 | while ((random[0] == 1.) || (random[0] == 0.)); |
880 | stepSize = - TMath::Log(random[0]) / pp; | |
881 | gMC->SetMaxStep(stepSize); | |
c4214bc0 | 882 | } |
883 | } | |
5c7f4665 | 884 | } |
d3f347ff | 885 | } |
5c7f4665 | 886 | } |
5c7f4665 | 887 | } |
888 | ||
a328fff9 | 889 | //_____________________________________________________________________________ |
890 | void AliTRDv1::StepManagerFixedStep() | |
891 | { | |
892 | // | |
893 | // Slow simulator. Every charged track produces electron cluster as hits | |
894 | // along its path across the drift volume. The step size is fixed in | |
895 | // this version of the step manager. | |
896 | // | |
897 | ||
898 | Int_t pla = 0; | |
899 | Int_t cha = 0; | |
900 | Int_t sec = 0; | |
901 | Int_t det = 0; | |
902 | Int_t qTot; | |
903 | ||
904 | Float_t hits[3]; | |
905 | Double_t eDep; | |
906 | ||
907 | Bool_t drRegion = kFALSE; | |
908 | Bool_t amRegion = kFALSE; | |
909 | ||
910 | TString cIdCurrent; | |
911 | TString cIdSensDr = "J"; | |
912 | TString cIdSensAm = "K"; | |
913 | Char_t cIdChamber[3]; | |
914 | cIdChamber[2] = 0; | |
915 | ||
916 | TLorentzVector pos, mom; | |
917 | ||
918 | const Int_t kNplan = AliTRDgeometry::Nplan(); | |
919 | const Int_t kNcham = AliTRDgeometry::Ncham(); | |
920 | const Int_t kNdetsec = kNplan * kNcham; | |
921 | ||
922 | const Double_t kBig = 1.0E+12; | |
923 | ||
bc327ce2 | 924 | const Float_t kWion = 23.53; // Ionization energy |
a328fff9 | 925 | const Float_t kEkinMinStep = 1.0e-5; // Minimum energy for the step size adjustment |
926 | ||
927 | // Set the maximum step size to a very large number for all | |
928 | // neutral particles and those outside the driftvolume | |
929 | gMC->SetMaxStep(kBig); | |
930 | ||
931 | // If not charged track or already stopped or disappeared, just return. | |
932 | if ((!gMC->TrackCharge()) || | |
933 | gMC->IsTrackStop() || | |
934 | gMC->IsTrackDisappeared()) return; | |
935 | ||
936 | // Inside a sensitive volume? | |
937 | cIdCurrent = gMC->CurrentVolName(); | |
938 | ||
939 | if (cIdSensDr == cIdCurrent[1]) drRegion = kTRUE; | |
940 | if (cIdSensAm == cIdCurrent[1]) amRegion = kTRUE; | |
941 | ||
942 | if ((!drRegion) && (!amRegion)) return; | |
943 | ||
944 | // The hit coordinates and charge | |
945 | gMC->TrackPosition(pos); | |
946 | hits[0] = pos[0]; | |
947 | hits[1] = pos[1]; | |
948 | hits[2] = pos[2]; | |
949 | ||
950 | // The sector number (0 - 17) | |
951 | // The numbering goes clockwise and starts at y = 0 | |
952 | Float_t phi = kRaddeg*TMath::ATan2(pos[0],pos[1]); | |
953 | if (phi < 90.) phi += 270.; | |
954 | else phi -= 90.; | |
955 | sec = ((Int_t) (phi / 20.)); | |
956 | ||
957 | // The plane and chamber number | |
958 | cIdChamber[0] = cIdCurrent[2]; | |
959 | cIdChamber[1] = cIdCurrent[3]; | |
960 | Int_t idChamber = (atoi(cIdChamber) % kNdetsec); | |
a5cadd36 | 961 | cha = kNcham - ((Int_t) idChamber / kNplan) - 1; |
a328fff9 | 962 | pla = ((Int_t) idChamber % kNplan); |
e0d47c25 | 963 | |
a328fff9 | 964 | // Check on selected volumes |
965 | Int_t addthishit = 1; | |
966 | if(fSensSelect) { | |
967 | if ((fSensPlane >= 0) && (pla != fSensPlane )) addthishit = 0; | |
968 | if ((fSensChamber >= 0) && (cha != fSensChamber)) addthishit = 0; | |
969 | if (fSensSector >= 0) { | |
970 | Int_t sens1 = fSensSector; | |
971 | Int_t sens2 = fSensSector + fSensSectorRange; | |
972 | sens2 -= ((Int_t) (sens2 / AliTRDgeometry::Nsect())) * AliTRDgeometry::Nsect(); | |
973 | if (sens1 < sens2) { | |
974 | if ((sec < sens1) || (sec >= sens2)) addthishit = 0; | |
975 | } | |
976 | else { | |
977 | if ((sec < sens1) && (sec >= sens2)) addthishit = 0; | |
978 | } | |
979 | } | |
980 | } | |
981 | ||
982 | if (!addthishit) return; | |
983 | ||
984 | det = fGeometry->GetDetector(pla,cha,sec); // The detector number | |
985 | ||
986 | Int_t trkStat = 0; // 0: InFlight 1:Entering 2:Exiting | |
987 | ||
988 | // Special hits only in the drift region | |
989 | if (drRegion) { | |
990 | ||
991 | // Create a track reference at the entrance and exit of each | |
992 | // chamber that contain the momentum components of the particle | |
993 | ||
994 | if (gMC->IsTrackEntering()) { | |
995 | gMC->TrackMomentum(mom); | |
996 | AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber()); | |
997 | trkStat = 1; | |
998 | } | |
999 | if (gMC->IsTrackExiting()) { | |
1000 | gMC->TrackMomentum(mom); | |
1001 | AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber()); | |
1002 | trkStat = 2; | |
1003 | } | |
1004 | ||
1005 | // Create the hits from TR photons | |
1006 | if (fTR) CreateTRhit(det); | |
1007 | ||
1008 | } | |
1009 | ||
1010 | // Calculate the charge according to GEANT Edep | |
1011 | // Create a new dEdx hit | |
1012 | eDep = TMath::Max(gMC->Edep(),0.0) * 1.0e+09; | |
1013 | qTot = (Int_t) (eDep / kWion); | |
c4214bc0 | 1014 | AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber() |
1015 | ,det,hits,qTot,drRegion); | |
a328fff9 | 1016 | |
1017 | // Set Maximum Step Size | |
1018 | // Produce only one hit if Ekin is below cutoff | |
1019 | if ((gMC->Etot() - gMC->TrackMass()) < kEkinMinStep) return; | |
1020 | gMC->SetMaxStep(fStepSize); | |
1021 | ||
1022 | } | |
1023 | ||
5c7f4665 | 1024 | //_____________________________________________________________________________ |
1025 | Double_t AliTRDv1::BetheBloch(Double_t bg) | |
1026 | { | |
1027 | // | |
1028 | // Parametrization of the Bethe-Bloch-curve | |
1029 | // The parametrization is the same as for the TPC and is taken from Lehrhaus. | |
1030 | // | |
1031 | ||
1032 | // This parameters have been adjusted to averaged values from GEANT | |
1033 | const Double_t kP1 = 7.17960e-02; | |
1034 | const Double_t kP2 = 8.54196; | |
1035 | const Double_t kP3 = 1.38065e-06; | |
1036 | const Double_t kP4 = 5.30972; | |
1037 | const Double_t kP5 = 2.83798; | |
1038 | ||
1039 | // This parameters have been adjusted to Xe-data found in: | |
1040 | // Allison & Cobb, Ann. Rev. Nucl. Sci. (1980), 30, 253 | |
1041 | //const Double_t kP1 = 0.76176E-1; | |
1042 | //const Double_t kP2 = 10.632; | |
1043 | //const Double_t kP3 = 3.17983E-6; | |
1044 | //const Double_t kP4 = 1.8631; | |
1045 | //const Double_t kP5 = 1.9479; | |
1046 | ||
f73816f5 | 1047 | // Lower cutoff of the Bethe-Bloch-curve to limit step sizes |
1048 | const Double_t kBgMin = 0.8; | |
1049 | const Double_t kBBMax = 6.83298; | |
1050 | //const Double_t kBgMin = 0.6; | |
1051 | //const Double_t kBBMax = 17.2809; | |
1052 | //const Double_t kBgMin = 0.4; | |
1053 | //const Double_t kBBMax = 82.0; | |
1054 | ||
1055 | if (bg > kBgMin) { | |
5c7f4665 | 1056 | Double_t yy = bg / TMath::Sqrt(1. + bg*bg); |
1057 | Double_t aa = TMath::Power(yy,kP4); | |
1058 | Double_t bb = TMath::Power((1./bg),kP5); | |
1059 | bb = TMath::Log(kP3 + bb); | |
1060 | return ((kP2 - aa - bb)*kP1 / aa); | |
1061 | } | |
f73816f5 | 1062 | else { |
1063 | return kBBMax; | |
1064 | } | |
d3f347ff | 1065 | |
fe4da5cc | 1066 | } |
5c7f4665 | 1067 | |
a328fff9 | 1068 | //_____________________________________________________________________________ |
c4214bc0 | 1069 | Double_t AliTRDv1::BetheBlochGeant(Double_t bg) |
a328fff9 | 1070 | { |
1071 | // | |
1072 | // Return dN/dx (number of primary collisions per centimeter) | |
1073 | // for given beta*gamma factor. | |
1074 | // | |
1075 | // Implemented by K.Oyama according to GEANT 3 parametrization shown in | |
1076 | // A.Andronic's webpage: http://www-alice.gsi.de/trd/papers/dedx/dedx.html | |
1077 | // This must be used as a set with IntSpecGeant. | |
1078 | // | |
1079 | ||
1080 | Double_t arr_g[20] = { | |
1081 | 1.100000, 1.200000, 1.300000, 1.500000, | |
1082 | 1.800000, 2.000000, 2.500000, 3.000000, | |
1083 | 4.000000, 7.000000, 10.000000, 20.000000, | |
1084 | 40.000000, 70.000000, 100.000000, 300.000000, | |
1085 | 600.000000, 1000.000000, 3000.000000, 10000.000000 }; | |
1086 | ||
1087 | Double_t arr_nc[20] = { | |
1088 | 75.009056, 45.508083, 35.299252, 27.116327, | |
1089 | 22.734999, 21.411915, 19.934095, 19.449375, | |
1090 | 19.344431, 20.185553, 21.027925, 22.912676, | |
1091 | 24.933352, 26.504053, 27.387468, 29.566597, | |
1092 | 30.353779, 30.787134, 31.129285, 31.157350 }; | |
1093 | ||
1094 | // betagamma to gamma | |
1095 | Double_t g = TMath::Sqrt( 1. + bg*bg ); | |
1096 | ||
1097 | // Find the index just before the point we need. | |
1098 | int i; | |
1099 | for( i = 0 ; i < 18 ; i++ ) | |
1100 | if( arr_g[i] < g && arr_g[i+1] > g ) | |
1101 | break; | |
1102 | ||
1103 | // Simple interpolation. | |
1104 | Double_t pp = ((arr_nc[i+1] - arr_nc[i]) / | |
1105 | (arr_g[i+1]-arr_g[i])) * (g-arr_g[i]) + arr_nc[i]; | |
1106 | ||
c4214bc0 | 1107 | return pp; //arr_nc[8]; |
a328fff9 | 1108 | |
1109 | } | |
1110 | ||
c4214bc0 | 1111 | //_____________________________________________________________________________ |
1112 | void AliTRDv1::Stepping() | |
1113 | { | |
1114 | // Stepping info | |
1115 | // --- | |
1116 | ||
1117 | cout << "X(cm) " | |
1118 | << "Y(cm) " | |
1119 | << "Z(cm) " | |
1120 | << "KinE(MeV) " | |
1121 | << "dE(MeV) " | |
1122 | << "Step(cm) " | |
1123 | << "TrackL(cm) " | |
1124 | << "Volume " | |
1125 | << "Process " | |
1126 | << endl; | |
1127 | ||
1128 | // Position | |
1129 | // | |
1130 | Double_t x, y, z; | |
1131 | gMC->TrackPosition(x, y, z); | |
1132 | cout << setw(8) << setprecision(3) << x << " " | |
1133 | << setw(8) << setprecision(3) << y << " " | |
1134 | << setw(8) << setprecision(3) << z << " "; | |
1135 | ||
1136 | // Kinetic energy | |
1137 | // | |
1138 | Double_t px, py, pz, etot; | |
1139 | gMC->TrackMomentum(px, py, pz, etot); | |
1140 | Double_t ekin = etot - gMC->TrackMass(); | |
1141 | cout << setw(9) << setprecision(4) << ekin*1e03 << " "; | |
1142 | ||
1143 | // Energy deposit | |
1144 | // | |
1145 | cout << setw(9) << setprecision(4) << gMC->Edep()*1e03 << " "; | |
1146 | ||
1147 | // Step length | |
1148 | // | |
1149 | cout << setw(8) << setprecision(3) << gMC->TrackStep() << " "; | |
1150 | ||
1151 | // Track length | |
1152 | // | |
1153 | cout << setw(8) << setprecision(3) << gMC->TrackLength() << " "; | |
1154 | ||
1155 | // Volume | |
1156 | // | |
1157 | if (gMC->CurrentVolName() != 0) | |
1158 | cout << setw(4) << gMC->CurrentVolName() << " "; | |
1159 | else | |
1160 | cout << setw(4) << "None" << " "; | |
1161 | ||
1162 | // Process | |
1163 | // | |
1164 | TArrayI processes; | |
1165 | Int_t nofProcesses = gMC->StepProcesses(processes); | |
1166 | for(int ip=0;ip<nofProcesses; ip++) | |
1167 | cout << TMCProcessName[processes[ip]]<<" / "; | |
1168 | ||
1169 | cout << endl; | |
1170 | } | |
1171 | ||
1172 | ||
5c7f4665 | 1173 | //_____________________________________________________________________________ |
1174 | Double_t Ermilova(Double_t *x, Double_t *) | |
1175 | { | |
1176 | // | |
1177 | // Calculates the delta-ray energy distribution according to Ermilova. | |
1178 | // Logarithmic scale ! | |
1179 | // | |
1180 | ||
1181 | Double_t energy; | |
1182 | Double_t dpos; | |
1183 | Double_t dnde; | |
1184 | ||
1185 | Int_t pos1, pos2; | |
1186 | ||
8230f242 | 1187 | const Int_t kNv = 31; |
5c7f4665 | 1188 | |
8230f242 | 1189 | Float_t vxe[kNv] = { 2.3026, 2.9957, 3.4012, 3.6889, 3.9120 |
1190 | , 4.0943, 4.2485, 4.3820, 4.4998, 4.6052 | |
1191 | , 4.7005, 5.0752, 5.2983, 5.7038, 5.9915 | |
1192 | , 6.2146, 6.5221, 6.9078, 7.3132, 7.6009 | |
1193 | , 8.0064, 8.5172, 8.6995, 8.9872, 9.2103 | |
1194 | , 9.4727, 9.9035,10.3735,10.5966,10.8198 | |
1195 | ,11.5129 }; | |
5c7f4665 | 1196 | |
8230f242 | 1197 | Float_t vye[kNv] = { 80.0 , 31.0 , 23.3 , 21.1 , 21.0 |
1198 | , 20.9 , 20.8 , 20.0 , 16.0 , 11.0 | |
1199 | , 8.0 , 6.0 , 5.2 , 4.6 , 4.0 | |
1200 | , 3.5 , 3.0 , 1.4 , 0.67 , 0.44 | |
1201 | , 0.3 , 0.18 , 0.12 , 0.08 , 0.056 | |
1202 | , 0.04 , 0.023, 0.015, 0.011, 0.01 | |
1203 | , 0.004 }; | |
5c7f4665 | 1204 | |
1205 | energy = x[0]; | |
1206 | ||
1207 | // Find the position | |
1208 | pos1 = pos2 = 0; | |
1209 | dpos = 0; | |
1210 | do { | |
1211 | dpos = energy - vxe[pos2++]; | |
1212 | } | |
1213 | while (dpos > 0); | |
1214 | pos2--; | |
f73816f5 | 1215 | if (pos2 > kNv) pos2 = kNv - 1; |
5c7f4665 | 1216 | pos1 = pos2 - 1; |
1217 | ||
1218 | // Differentiate between the sampling points | |
1219 | dnde = (vye[pos1] - vye[pos2]) / (vxe[pos2] - vxe[pos1]); | |
1220 | ||
1221 | return dnde; | |
1222 | ||
1223 | } | |
a328fff9 | 1224 | |
1225 | //_____________________________________________________________________________ | |
1226 | Double_t IntSpecGeant(Double_t *x, Double_t *) | |
1227 | { | |
1228 | // | |
1229 | // Integrated spectrum from Geant3 | |
1230 | // | |
1231 | ||
96efaf83 | 1232 | const Int_t npts = 83; |
1233 | Double_t arre[npts] = { | |
a328fff9 | 1234 | 2.421257, 2.483278, 2.534301, 2.592230, |
1235 | 2.672067, 2.813299, 3.015059, 3.216819, | |
1236 | 3.418579, 3.620338, 3.868209, 3.920198, | |
1237 | 3.978284, 4.063923, 4.186264, 4.308605, | |
1238 | 4.430946, 4.553288, 4.724261, 4.837736, | |
1239 | 4.999842, 5.161949, 5.324056, 5.486163, | |
1240 | 5.679688, 5.752998, 5.857728, 5.962457, | |
1241 | 6.067185, 6.171914, 6.315653, 6.393674, | |
1242 | 6.471694, 6.539689, 6.597658, 6.655627, | |
1243 | 6.710957, 6.763648, 6.816338, 6.876198, | |
1244 | 6.943227, 7.010257, 7.106285, 7.252151, | |
1245 | 7.460531, 7.668911, 7.877290, 8.085670, | |
1246 | 8.302979, 8.353585, 8.413120, 8.483500, | |
1247 | 8.541030, 8.592857, 8.668865, 8.820485, | |
1248 | 9.037086, 9.253686, 9.470286, 9.686887, | |
1249 | 9.930838, 9.994655, 10.085822, 10.176990, | |
1250 | 10.268158, 10.359325, 10.503614, 10.627565, | |
1251 | 10.804637, 10.981709, 11.158781, 11.335854, | |
1252 | 11.593397, 11.781165, 12.049404, 12.317644, | |
1253 | 12.585884, 12.854123, 14.278421, 16.975889, | |
1254 | 20.829416, 24.682943, 28.536469 | |
1255 | }; | |
96efaf83 | 1256 | /* |
1257 | Double_t arrdndx[npts] = { | |
a328fff9 | 1258 | 19.344431, 18.664679, 18.136106, 17.567745, |
1259 | 16.836426, 15.677382, 14.281277, 13.140237, | |
1260 | 12.207677, 11.445510, 10.697049, 10.562296, | |
1261 | 10.414673, 10.182341, 9.775256, 9.172330, | |
1262 | 8.240271, 6.898587, 4.808303, 3.889751, | |
1263 | 3.345288, 3.093431, 2.897347, 2.692470, | |
1264 | 2.436222, 2.340029, 2.208579, 2.086489, | |
1265 | 1.975535, 1.876519, 1.759626, 1.705024, | |
1266 | 1.656374, 1.502638, 1.330566, 1.200697, | |
1267 | 1.101168, 1.019323, 0.943867, 0.851951, | |
1268 | 0.755229, 0.671576, 0.570675, 0.449672, | |
1269 | 0.326722, 0.244225, 0.188225, 0.149608, | |
1270 | 0.121529, 0.116289, 0.110636, 0.103490, | |
1271 | 0.096147, 0.089191, 0.079780, 0.063927, | |
1272 | 0.047642, 0.036341, 0.028250, 0.022285, | |
1273 | 0.017291, 0.016211, 0.014802, 0.013533, | |
1274 | 0.012388, 0.011352, 0.009803, 0.008537, | |
1275 | 0.007039, 0.005829, 0.004843, 0.004034, | |
1276 | 0.003101, 0.002564, 0.001956, 0.001494, | |
1277 | 0.001142, 0.000873, 0.000210, 0.000014, | |
1278 | 0.000000, 0.000000, 0.000000 | |
1279 | }; | |
96efaf83 | 1280 | */ |
1281 | // Differentiate | |
1282 | // dnde = (arrdndx[i-1] - arrdndx[i]) / (arre[i] - arre[i-1]); | |
1283 | ||
1284 | Double_t arrdnde[npts] = { | |
1285 | 10.960000, 10.960000, 10.359500, 9.811340, | |
1286 | 9.1601500, 8.206670, 6.919630, 5.655430, | |
1287 | 4.6221300, 3.777610, 3.019560, 2.591950, | |
1288 | 2.5414600, 2.712920, 3.327460, 4.928240, | |
1289 | 7.6185300, 10.966700, 12.225800, 8.094750, | |
1290 | 3.3586900, 1.553650, 1.209600, 1.263840, | |
1291 | 1.3241100, 1.312140, 1.255130, 1.165770, | |
1292 | 1.0594500, 0.945450, 0.813231, 0.699837, | |
1293 | 0.6235580, 2.260990, 2.968350, 2.240320, | |
1294 | 1.7988300, 1.553300, 1.432070, 1.535520, | |
1295 | 1.4429900, 1.247990, 1.050750, 0.829549, | |
1296 | 0.5900280, 0.395897, 0.268741, 0.185320, | |
1297 | 0.1292120, 0.103545, 0.0949525, 0.101535, | |
1298 | 0.1276380, 0.134216, 0.123816, 0.104557, | |
1299 | 0.0751843, 0.0521745, 0.0373546, 0.0275391, | |
1300 | 0.0204713, 0.0169234, 0.0154552, 0.0139194, | |
1301 | 0.0125592, 0.0113638, 0.0107354, 0.0102137, | |
1302 | 0.00845984, 0.00683338, 0.00556836, 0.00456874, | |
1303 | 0.0036227, 0.00285991, 0.00226664, 0.00172234, | |
1304 | 0.00131226, 0.00100284, 0.000465492, 7.26607e-05, | |
1305 | 3.63304e-06, 0.0000000, 0.0000000 | |
1306 | }; | |
a328fff9 | 1307 | |
1308 | Int_t i; | |
1309 | Double_t energy = x[0]; | |
a328fff9 | 1310 | |
96efaf83 | 1311 | for( i = 0 ; i < npts ; i++ ) |
1312 | if( energy < arre[i] ) break; | |
a328fff9 | 1313 | |
1314 | if( i == 0 ) | |
45160b1f | 1315 | AliErrorGeneral("AliTRDv1","Given energy value is too small or zero"); |
a328fff9 | 1316 | |
96efaf83 | 1317 | return arrdnde[i]; |
a328fff9 | 1318 | |
1319 | } |