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Cleaned up code for coding conventions.
[u/mrichter/AliRoot.git] / TRD / AliTRDsim.cxx
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46d29e70 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/* $Id$ */
46d29e70 17
18///////////////////////////////////////////////////////////////////////////////
19// //
20// TRD simulation - multimodule (regular rad.) //
21// after: M. CASTELLANO et al., COMP. PHYS. COMM. 51 (1988) 431 //
22// + COMP. PHYS. COMM. 61 (1990) 395 //
23// //
24// 17.07.1998 - A.Andronic //
25// 08.12.1998 - simplified version //
26// 11.07.2000 - Adapted code to aliroot environment (C.Blume) //
0142cb22 27// 04.06.2004 - Momentum dependent parameters implemented (CBL) //
46d29e70 28// //
29///////////////////////////////////////////////////////////////////////////////
30
31#include <stdlib.h>
32
0e9c2ad5 33#include <TH1.h>
34#include <TRandom.h>
35#include <TMath.h>
36#include <TParticle.h>
46d29e70 37
46d29e70 38#include "AliModule.h"
39
0e9c2ad5 40#include "AliTRDsim.h"
41
46d29e70 42ClassImp(AliTRDsim)
43
44//_____________________________________________________________________________
45AliTRDsim::AliTRDsim():TObject()
46{
47 //
48 // AliTRDsim default constructor
49 //
50
fa5e892a 51 fSpectrum = 0;
d1b06c24 52 fSigma = 0;
0142cb22 53 fNFoils = 0;
54 fNFoilsUp = 0;
fa5e892a 55
46d29e70 56 Init();
57
58}
59
60//_____________________________________________________________________________
61AliTRDsim::AliTRDsim(AliModule *mod, Int_t foil, Int_t gap)
62{
63 //
64 // AliTRDsim constructor. Takes the material properties of the radiator
65 // foils and the gas in the gaps from AliModule <mod>.
66 // The default number of foils is 100 with a thickness of 20 mu. The
67 // thickness of the gaps is 500 mu.
68 //
69
70 Float_t aFoil, zFoil, rhoFoil;
71 Float_t aGap, zGap, rhoGap;
72 Float_t rad, abs;
73 Char_t name[21];
74
fa5e892a 75 fSpectrum = 0;
d1b06c24 76 fSigma = 0;
0142cb22 77 fNFoils = 0;
78 fNFoilsUp = 0;
fa5e892a 79
46d29e70 80 Init();
81
82 mod->AliGetMaterial(foil,name,aFoil,zFoil,rhoFoil,rad,abs);
83 mod->AliGetMaterial(gap ,name,aGap ,zGap ,rhoGap ,rad,abs);
84
85 fFoilDens = rhoFoil;
86 fFoilA = aFoil;
87 fFoilZ = zFoil;
88 fFoilOmega = Omega(fFoilDens,fFoilZ,fFoilA);
89
90 fGapDens = rhoGap;
91 fGapA = aGap;
92 fGapZ = zGap;
93 fGapOmega = Omega(fGapDens ,fGapZ ,fGapA );
94
95}
96
97//_____________________________________________________________________________
73ae7b59 98AliTRDsim::AliTRDsim(const AliTRDsim &s):TObject(s)
46d29e70 99{
100 //
101 // AliTRDsim copy constructor
102 //
103
104 ((AliTRDsim &) s).Copy(*this);
105
106}
107
108//_____________________________________________________________________________
109AliTRDsim::~AliTRDsim()
110{
111 //
112 // AliTRDsim destructor
113 //
114
5567246e 115 // if (fSpectrum) delete fSpectrum;
116 if (fSigma) delete [] fSigma;
0142cb22 117 if (fNFoils) delete [] fNFoils;
118 if (fNFoilsUp) delete [] fNFoilsUp;
46d29e70 119
120}
121
122//_____________________________________________________________________________
123AliTRDsim &AliTRDsim::operator=(const AliTRDsim &s)
124{
125 //
126 // Assignment operator
127 //
128
129 if (this != &s) ((AliTRDsim &) s).Copy(*this);
130 return *this;
131
132}
133
134//_____________________________________________________________________________
135void AliTRDsim::Copy(TObject &s)
136{
137 //
138 // Copy function
139 //
140
46d29e70 141 ((AliTRDsim &) s).fFoilThick = fFoilThick;
142 ((AliTRDsim &) s).fFoilDens = fFoilDens;
143 ((AliTRDsim &) s).fFoilOmega = fFoilOmega;
144 ((AliTRDsim &) s).fFoilZ = fFoilZ;
145 ((AliTRDsim &) s).fFoilA = fFoilA;
146 ((AliTRDsim &) s).fGapThick = fGapThick;
147 ((AliTRDsim &) s).fGapDens = fGapDens;
148 ((AliTRDsim &) s).fGapOmega = fGapOmega;
149 ((AliTRDsim &) s).fGapZ = fGapZ;
150 ((AliTRDsim &) s).fGapA = fGapA;
151 ((AliTRDsim &) s).fTemp = fTemp;
152 ((AliTRDsim &) s).fSpNBins = fSpNBins;
153 ((AliTRDsim &) s).fSpRange = fSpRange;
154 ((AliTRDsim &) s).fSpBinWidth = fSpBinWidth;
155 ((AliTRDsim &) s).fSpLower = fSpLower;
156 ((AliTRDsim &) s).fSpUpper = fSpUpper;
157
0142cb22 158 if (((AliTRDsim &) s).fNFoils) delete [] ((AliTRDsim &) s).fNFoils;
159 ((AliTRDsim &) s).fNFoils = new Int_t[fNFoilsDim];
160 for (Int_t iFoil = 0; iFoil < fNFoilsDim; iFoil++) {
161 ((AliTRDsim &) s).fNFoils[iFoil] = fNFoils[iFoil];
162 }
163
164 if (((AliTRDsim &) s).fNFoilsUp) delete [] ((AliTRDsim &) s).fNFoilsUp;
165 ((AliTRDsim &) s).fNFoilsUp = new Double_t[fNFoilsDim];
166 for (Int_t iFoil = 0; iFoil < fNFoilsDim; iFoil++) {
167 ((AliTRDsim &) s).fNFoilsUp[iFoil] = fNFoilsUp[iFoil];
168 }
169
170 if (((AliTRDsim &) s).fSigma) delete [] ((AliTRDsim &) s).fSigma;
46d29e70 171 ((AliTRDsim &) s).fSigma = new Double_t[fSpNBins];
172 for (Int_t iBin = 0; iBin < fSpNBins; iBin++) {
173 ((AliTRDsim &) s).fSigma[iBin] = fSigma[iBin];
174 }
175
176 fSpectrum->Copy(*((AliTRDsim &) s).fSpectrum);
177
178}
179
180//_____________________________________________________________________________
181void AliTRDsim::Init()
182{
183 //
184 // Initialization
0142cb22 185 // The default radiator are prolypropilene foils of 10 mu thickness
186 // with gaps of 80 mu filled with N2.
46d29e70 187 //
188
0142cb22 189 fNFoilsDim = 7;
190
191 if (fNFoils) delete [] fNFoils;
192 fNFoils = new Int_t[fNFoilsDim];
193 fNFoils[0] = 170;
194 fNFoils[1] = 250;
195 fNFoils[2] = 310;
196 fNFoils[3] = 380;
197 fNFoils[4] = 430;
198 fNFoils[5] = 490;
199 fNFoils[6] = 550;
200
201 if (fNFoilsUp) delete [] fNFoilsUp;
202 fNFoilsUp = new Double_t[fNFoilsDim];
203 fNFoilsUp[0] = 1.25;
204 fNFoilsUp[1] = 1.75;
205 fNFoilsUp[2] = 2.50;
206 fNFoilsUp[3] = 3.50;
207 fNFoilsUp[4] = 4.50;
208 fNFoilsUp[5] = 5.50;
209 fNFoilsUp[6] = 10000.0;
46d29e70 210
db30bf0f 211 fFoilThick = 0.0013;
46d29e70 212 fFoilDens = 0.92;
213 fFoilZ = 5.28571;
214 fFoilA = 10.4286;
215 fFoilOmega = Omega(fFoilDens,fFoilZ,fFoilA);
216
db30bf0f 217 fGapThick = 0.0060;
0142cb22 218 fGapDens = 0.00125;
219 fGapZ = 7.0;
220 fGapA = 14.00674;
46d29e70 221 fGapOmega = Omega(fGapDens ,fGapZ ,fGapA );
222
223 fTemp = 293.16;
224
225 fSpNBins = 200;
226 fSpRange = 100;
227 fSpBinWidth = fSpRange / fSpNBins;
228 fSpLower = 1.0 - 0.5 * fSpBinWidth;
229 fSpUpper = fSpLower + fSpRange;
230
231 if (fSpectrum) delete fSpectrum;
232 fSpectrum = new TH1D("TRspectrum","TR spectrum",fSpNBins,fSpLower,fSpUpper);
abaf1f1d 233 fSpectrum->SetDirectory(0);
46d29e70 234
235 // Set the sigma values
236 SetSigma();
237
238}
239
240//_____________________________________________________________________________
241Int_t AliTRDsim::CreatePhotons(Int_t pdg, Float_t p
242 , Int_t &nPhoton, Float_t *ePhoton)
243{
244 //
245 // Create TRD photons for a charged particle of type <pdg> with the total
246 // momentum <p>.
247 // Number of produced TR photons: <nPhoton>
248 // Energies of the produced TR photons: <ePhoton>
249 //
250
251 // PDG codes
252 const Int_t kPdgEle = 11;
253 const Int_t kPdgMuon = 13;
254 const Int_t kPdgPion = 211;
255 const Int_t kPdgKaon = 321;
256
257 Float_t mass = 0;
258 switch (TMath::Abs(pdg)) {
259 case kPdgEle:
260 mass = 5.11e-4;
261 break;
262 case kPdgMuon:
263 mass = 0.10566;
264 break;
265 case kPdgPion:
266 mass = 0.13957;
267 break;
268 case kPdgKaon:
269 mass = 0.4937;
270 break;
271 default:
272 return 0;
273 break;
274 };
275
46d29e70 276 // Calculate the TR photons
0142cb22 277 return TrPhotons(p, mass, nPhoton, ePhoton);
46d29e70 278
279}
280
281//_____________________________________________________________________________
0142cb22 282Int_t AliTRDsim::TrPhotons(Float_t p, Float_t mass
283 , Int_t &nPhoton, Float_t *ePhoton)
46d29e70 284{
285 //
286 // Produces TR photons.
287 //
288
289 const Double_t kAlpha = 0.0072973;
290 const Int_t kSumMax = 10;
291
292 Double_t kappa = fGapThick / fFoilThick;
293
0142cb22 294 // Calculate gamma
295 Double_t gamma = TMath::Sqrt(p*p + mass*mass) / mass;
296
297 // Select the number of foils corresponding to momentum
298 Int_t foils = SelectNFoils(p);
299
46d29e70 300 fSpectrum->Reset();
301
302 // The TR spectrum
303 Double_t stemp = 0;
304 for (Int_t iBin = 0; iBin < fSpNBins; iBin++) {
305
306 // keV -> eV
307 Double_t energyeV = (fSpBinWidth * iBin + 1.0) * 1e3;
308
309 Double_t csFoil = fFoilOmega / energyeV;
310 Double_t csGap = fGapOmega / energyeV;
311
312 Double_t rho1 = energyeV * fFoilThick * 1e4 * 2.5
313 * (1.0 / (gamma*gamma) + csFoil*csFoil);
314 Double_t rho2 = energyeV * fFoilThick * 1e4 * 2.5
315 * (1.0 / (gamma*gamma) + csGap *csGap);
316
317 // Calculate the sum
318 Double_t sum = 0;
319 for (Int_t iSum = 0; iSum < kSumMax; iSum++) {
320 Double_t tetan = (TMath::Pi() * 2.0 * (iSum+1) - (rho1 + kappa * rho2))
321 / (kappa + 1.0);
322 if (tetan < 0.0) tetan = 0.0;
323 Double_t aux = 1.0 / (rho1 + tetan) - 1.0 / (rho2 + tetan);
324 sum += tetan * (aux*aux) * (1.0 - TMath::Cos(rho1 + tetan));
325 }
326
327 // Absorbtion
0142cb22 328 Double_t conv = 1.0 - TMath::Exp(-foils * fSigma[iBin]);
46d29e70 329
330 // eV -> keV
331 Float_t energykeV = energyeV * 0.001;
332
333 // dN / domega
334 Double_t wn = kAlpha * 4.0 / (fSigma[iBin] * (kappa + 1.0))
335 * conv * sum / energykeV;
336 fSpectrum->SetBinContent(iBin,wn);
337
338 stemp += wn;
339
340 }
341
342 // <nTR> (binsize corr.)
343 Float_t ntr = stemp * fSpBinWidth;
344 // Number of TR photons from Poisson distribution with mean <ntr>
345 nPhoton = gRandom->Poisson(ntr);
346 // Energy of the TR photons
347 for (Int_t iPhoton = 0; iPhoton < nPhoton; iPhoton++) {
348 ePhoton[iPhoton] = fSpectrum->GetRandom();
349 }
350
351 return 1;
352
353}
354
355//_____________________________________________________________________________
356void AliTRDsim::SetSigma()
357{
358 //
359 // Sets the absorbtion crosssection for the energies of the TR spectrum
360 //
361
5567246e 362 if (fSigma) delete [] fSigma;
46d29e70 363 fSigma = new Double_t[fSpNBins];
364 for (Int_t iBin = 0; iBin < fSpNBins; iBin++) {
365 Double_t energykeV = iBin * fSpBinWidth + 1.0;
366 fSigma[iBin] = Sigma(energykeV);
367 //printf("SetSigma(): iBin = %d fSigma %g\n",iBin,fSigma[iBin]);
368 }
369
370}
371
372//_____________________________________________________________________________
373Double_t AliTRDsim::Sigma(Double_t energykeV)
374{
375 //
376 // Calculates the absorbtion crosssection for a one-foil-one-gap-radiator
377 //
378
46d29e70 379 // keV -> MeV
380 Double_t energyMeV = energykeV * 0.001;
381 if (energyMeV >= 0.001) {
842287f2 382 return(GetMuPo(energyMeV) * fFoilDens * fFoilThick +
383 GetMuAi(energyMeV) * fGapDens * fGapThick * GetTemp());
46d29e70 384 }
385 else {
386 return 1e6;
387 }
388
389}
390
391//_____________________________________________________________________________
392Double_t AliTRDsim::GetMuPo(Double_t energyMeV)
393{
394 //
395 // Returns the photon absorbtion cross section for polypropylene
396 //
397
398 const Int_t kN = 36;
399
400 Double_t mu[kN] = { 1.894E+03, 5.999E+02, 2.593E+02
401 , 7.743E+01, 3.242E+01, 1.643E+01
402 , 9.432E+00, 3.975E+00, 2.088E+00
403 , 7.452E-01, 4.315E-01, 2.706E-01
404 , 2.275E-01, 2.084E-01, 1.970E-01
405 , 1.823E-01, 1.719E-01, 1.534E-01
406 , 1.402E-01, 1.217E-01, 1.089E-01
407 , 9.947E-02, 9.198E-02, 8.078E-02
408 , 7.262E-02, 6.495E-02, 5.910E-02
409 , 5.064E-02, 4.045E-02, 3.444E-02
410 , 3.045E-02, 2.760E-02, 2.383E-02
411 , 2.145E-02, 1.819E-02, 1.658E-02 };
412
413 Double_t en[kN] = { 1.000E-03, 1.500E-03, 2.000E-03
414 , 3.000E-03, 4.000E-03, 5.000E-03
415 , 6.000E-03, 8.000E-03, 1.000E-02
416 , 1.500E-02, 2.000E-02, 3.000E-02
417 , 4.000E-02, 5.000E-02, 6.000E-02
418 , 8.000E-02, 1.000E-01, 1.500E-01
419 , 2.000E-01, 3.000E-01, 4.000E-01
420 , 5.000E-01, 6.000E-01, 8.000E-01
421 , 1.000E+00, 1.250E+00, 1.500E+00
422 , 2.000E+00, 3.000E+00, 4.000E+00
423 , 5.000E+00, 6.000E+00, 8.000E+00
424 , 1.000E+01, 1.500E+01, 2.000E+01 };
425
426 return Interpolate(energyMeV,en,mu,kN);
427
428}
429
430//_____________________________________________________________________________
431Double_t AliTRDsim::GetMuCO(Double_t energyMeV)
432{
433 //
434 // Returns the photon absorbtion cross section for CO2
435 //
436
437 const Int_t kN = 36;
438
439 Double_t mu[kN] = { 0.39383E+04, 0.13166E+04, 0.58750E+03
440 , 0.18240E+03, 0.77996E+02, 0.40024E+02
441 , 0.23116E+02, 0.96997E+01, 0.49726E+01
442 , 0.15543E+01, 0.74915E+00, 0.34442E+00
443 , 0.24440E+00, 0.20589E+00, 0.18632E+00
444 , 0.16578E+00, 0.15394E+00, 0.13558E+00
445 , 0.12336E+00, 0.10678E+00, 0.95510E-01
446 , 0.87165E-01, 0.80587E-01, 0.70769E-01
447 , 0.63626E-01, 0.56894E-01, 0.51782E-01
448 , 0.44499E-01, 0.35839E-01, 0.30825E-01
449 , 0.27555E-01, 0.25269E-01, 0.22311E-01
450 , 0.20516E-01, 0.18184E-01, 0.17152E-01 };
451
452 Double_t en[kN] = { 0.10000E-02, 0.15000E-02, 0.20000E-02
453 , 0.30000E-02, 0.40000E-02, 0.50000E-02
454 , 0.60000E-02, 0.80000E-02, 0.10000E-01
455 , 0.15000E-01, 0.20000E-01, 0.30000E-01
456 , 0.40000E-01, 0.50000E-01, 0.60000E-01
457 , 0.80000E-01, 0.10000E+00, 0.15000E+00
458 , 0.20000E+00, 0.30000E+00, 0.40000E+00
459 , 0.50000E+00, 0.60000E+00, 0.80000E+00
460 , 0.10000E+01, 0.12500E+01, 0.15000E+01
461 , 0.20000E+01, 0.30000E+01, 0.40000E+01
462 , 0.50000E+01, 0.60000E+01, 0.80000E+01
463 , 0.10000E+02, 0.15000E+02, 0.20000E+02 };
464
465 return Interpolate(energyMeV,en,mu,kN);
466
467}
468
469//_____________________________________________________________________________
470Double_t AliTRDsim::GetMuXe(Double_t energyMeV)
471{
472 //
473 // Returns the photon absorbtion cross section for xenon
474 //
475
476 const Int_t kN = 48;
477
478 Double_t mu[kN] = { 9.413E+03, 8.151E+03, 7.035E+03
479 , 7.338E+03, 4.085E+03, 2.088E+03
480 , 7.780E+02, 3.787E+02, 2.408E+02
481 , 6.941E+02, 6.392E+02, 6.044E+02
482 , 8.181E+02, 7.579E+02, 6.991E+02
483 , 8.064E+02, 6.376E+02, 3.032E+02
484 , 1.690E+02, 5.743E+01, 2.652E+01
485 , 8.930E+00, 6.129E+00, 3.316E+01
486 , 2.270E+01, 1.272E+01, 7.825E+00
487 , 3.633E+00, 2.011E+00, 7.202E-01
488 , 3.760E-01, 1.797E-01, 1.223E-01
489 , 9.699E-02, 8.281E-02, 6.696E-02
490 , 5.785E-02, 5.054E-02, 4.594E-02
491 , 4.078E-02, 3.681E-02, 3.577E-02
492 , 3.583E-02, 3.634E-02, 3.797E-02
493 , 3.987E-02, 4.445E-02, 4.815E-02 };
494
495 Double_t en[kN] = { 1.00000E-03, 1.07191E-03, 1.14900E-03
496 , 1.14900E-03, 1.50000E-03, 2.00000E-03
497 , 3.00000E-03, 4.00000E-03, 4.78220E-03
498 , 4.78220E-03, 5.00000E-03, 5.10370E-03
499 , 5.10370E-03, 5.27536E-03, 5.45280E-03
500 , 5.45280E-03, 6.00000E-03, 8.00000E-03
501 , 1.00000E-02, 1.50000E-02, 2.00000E-02
502 , 3.00000E-02, 3.45614E-02, 3.45614E-02
503 , 4.00000E-02, 5.00000E-02, 6.00000E-02
504 , 8.00000E-02, 1.00000E-01, 1.50000E-01
505 , 2.00000E-01, 3.00000E-01, 4.00000E-01
506 , 5.00000E-01, 6.00000E-01, 8.00000E-01
507 , 1.00000E+00, 1.25000E+00, 1.50000E+00
508 , 2.00000E+00, 3.00000E+00, 4.00000E+00
509 , 5.00000E+00, 6.00000E+00, 8.00000E+00
510 , 1.00000E+01, 1.50000E+01, 2.00000E+01 };
511
512 return Interpolate(energyMeV,en,mu,kN);
513
514}
515
516//_____________________________________________________________________________
517Double_t AliTRDsim::GetMuBu(Double_t energyMeV)
518{
519 //
520 // Returns the photon absorbtion cross section for isobutane
521 //
522
523 const Int_t kN = 36;
524
525 Double_t mu[kN] = { 0.38846E+03, 0.12291E+03, 0.53225E+02
526 , 0.16091E+02, 0.69114E+01, 0.36541E+01
527 , 0.22282E+01, 0.11149E+01, 0.72887E+00
528 , 0.45053E+00, 0.38167E+00, 0.33920E+00
529 , 0.32155E+00, 0.30949E+00, 0.29960E+00
530 , 0.28317E+00, 0.26937E+00, 0.24228E+00
531 , 0.22190E+00, 0.19289E+00, 0.17288E+00
532 , 0.15789E+00, 0.14602E+00, 0.12829E+00
533 , 0.11533E+00, 0.10310E+00, 0.93790E-01
534 , 0.80117E-01, 0.63330E-01, 0.53229E-01
535 , 0.46390E-01, 0.41425E-01, 0.34668E-01
536 , 0.30267E-01, 0.23910E-01, 0.20509E-01 };
537
538 Double_t en[kN] = { 0.10000E-02, 0.15000E-02, 0.20000E-02
539 , 0.30000E-02, 0.40000E-02, 0.50000E-02
540 , 0.60000E-02, 0.80000E-02, 0.10000E-01
541 , 0.15000E-01, 0.20000E-01, 0.30000E-01
542 , 0.40000E-01, 0.50000E-01, 0.60000E-01
543 , 0.80000E-01, 0.10000E+00, 0.15000E+00
544 , 0.20000E+00, 0.30000E+00, 0.40000E+00
545 , 0.50000E+00, 0.60000E+00, 0.80000E+00
546 , 0.10000E+01, 0.12500E+01, 0.15000E+01
547 , 0.20000E+01, 0.30000E+01, 0.40000E+01
548 , 0.50000E+01, 0.60000E+01, 0.80000E+01
549 , 0.10000E+02, 0.15000E+02, 0.20000E+02 };
550
551 return Interpolate(energyMeV,en,mu,kN);
552
553}
554
555//_____________________________________________________________________________
556Double_t AliTRDsim::GetMuMy(Double_t energyMeV)
557{
558 //
559 // Returns the photon absorbtion cross section for mylar
560 //
561
562 const Int_t kN = 36;
563
564 Double_t mu[kN] = { 2.911E+03, 9.536E+02, 4.206E+02
565 , 1.288E+02, 5.466E+01, 2.792E+01
566 , 1.608E+01, 6.750E+00, 3.481E+00
567 , 1.132E+00, 5.798E-01, 3.009E-01
568 , 2.304E-01, 2.020E-01, 1.868E-01
569 , 1.695E-01, 1.586E-01, 1.406E-01
570 , 1.282E-01, 1.111E-01, 9.947E-02
571 , 9.079E-02, 8.395E-02, 7.372E-02
572 , 6.628E-02, 5.927E-02, 5.395E-02
573 , 4.630E-02, 3.715E-02, 3.181E-02
574 , 2.829E-02, 2.582E-02, 2.257E-02
575 , 2.057E-02, 1.789E-02, 1.664E-02 };
576
577 Double_t en[kN] = { 1.00000E-03, 1.50000E-03, 2.00000E-03
578 , 3.00000E-03, 4.00000E-03, 5.00000E-03
579 , 6.00000E-03, 8.00000E-03, 1.00000E-02
580 , 1.50000E-02, 2.00000E-02, 3.00000E-02
581 , 4.00000E-02, 5.00000E-02, 6.00000E-02
582 , 8.00000E-02, 1.00000E-01, 1.50000E-01
583 , 2.00000E-01, 3.00000E-01, 4.00000E-01
584 , 5.00000E-01, 6.00000E-01, 8.00000E-01
585 , 1.00000E+00, 1.25000E+00, 1.50000E+00
586 , 2.00000E+00, 3.00000E+00, 4.00000E+00
587 , 5.00000E+00, 6.00000E+00, 8.00000E+00
588 , 1.00000E+01, 1.50000E+01, 2.00000E+01 };
589
590 return Interpolate(energyMeV,en,mu,kN);
591
592}
593
594//_____________________________________________________________________________
595Double_t AliTRDsim::GetMuN2(Double_t energyMeV)
596{
597 //
598 // Returns the photon absorbtion cross section for nitrogen
599 //
600
601 const Int_t kN = 36;
602
603 Double_t mu[kN] = { 3.311E+03, 1.083E+03, 4.769E+02
604 , 1.456E+02, 6.166E+01, 3.144E+01
605 , 1.809E+01, 7.562E+00, 3.879E+00
606 , 1.236E+00, 6.178E-01, 3.066E-01
607 , 2.288E-01, 1.980E-01, 1.817E-01
608 , 1.639E-01, 1.529E-01, 1.353E-01
609 , 1.233E-01, 1.068E-01, 9.557E-02
610 , 8.719E-02, 8.063E-02, 7.081E-02
611 , 6.364E-02, 5.693E-02, 5.180E-02
612 , 4.450E-02, 3.579E-02, 3.073E-02
613 , 2.742E-02, 2.511E-02, 2.209E-02
614 , 2.024E-02, 1.782E-02, 1.673E-02 };
615
616 Double_t en[kN] = { 1.00000E-03, 1.50000E-03, 2.00000E-03
617 , 3.00000E-03, 4.00000E-03, 5.00000E-03
618 , 6.00000E-03, 8.00000E-03, 1.00000E-02
619 , 1.50000E-02, 2.00000E-02, 3.00000E-02
620 , 4.00000E-02, 5.00000E-02, 6.00000E-02
621 , 8.00000E-02, 1.00000E-01, 1.50000E-01
622 , 2.00000E-01, 3.00000E-01, 4.00000E-01
623 , 5.00000E-01, 6.00000E-01, 8.00000E-01
624 , 1.00000E+00, 1.25000E+00, 1.50000E+00
625 , 2.00000E+00, 3.00000E+00, 4.00000E+00
626 , 5.00000E+00, 6.00000E+00, 8.00000E+00
627 , 1.00000E+01, 1.50000E+01, 2.00000E+01 };
628
629 return Interpolate(energyMeV,en,mu,kN);
630
631}
632
633//_____________________________________________________________________________
634Double_t AliTRDsim::GetMuO2(Double_t energyMeV)
635{
636 //
637 // Returns the photon absorbtion cross section for oxygen
638 //
639
640 const Int_t kN = 36;
641
642 Double_t mu[kN] = { 4.590E+03, 1.549E+03, 6.949E+02
643 , 2.171E+02, 9.315E+01, 4.790E+01
644 , 2.770E+01, 1.163E+01, 5.952E+00
645 , 1.836E+00, 8.651E-01, 3.779E-01
646 , 2.585E-01, 2.132E-01, 1.907E-01
647 , 1.678E-01, 1.551E-01, 1.361E-01
648 , 1.237E-01, 1.070E-01, 9.566E-02
649 , 8.729E-02, 8.070E-02, 7.087E-02
650 , 6.372E-02, 5.697E-02, 5.185E-02
651 , 4.459E-02, 3.597E-02, 3.100E-02
652 , 2.777E-02, 2.552E-02, 2.263E-02
653 , 2.089E-02, 1.866E-02, 1.770E-02 };
654
655 Double_t en[kN] = { 1.00000E-03, 1.50000E-03, 2.00000E-03
656 , 3.00000E-03, 4.00000E-03, 5.00000E-03
657 , 6.00000E-03, 8.00000E-03, 1.00000E-02
658 , 1.50000E-02, 2.00000E-02, 3.00000E-02
659 , 4.00000E-02, 5.00000E-02, 6.00000E-02
660 , 8.00000E-02, 1.00000E-01, 1.50000E-01
661 , 2.00000E-01, 3.00000E-01, 4.00000E-01
662 , 5.00000E-01, 6.00000E-01, 8.00000E-01
663 , 1.00000E+00, 1.25000E+00, 1.50000E+00
664 , 2.00000E+00, 3.00000E+00, 4.00000E+00
665 , 5.00000E+00, 6.00000E+00, 8.00000E+00
666 , 1.00000E+01, 1.50000E+01, 2.00000E+01 };
667
668 return Interpolate(energyMeV,en,mu,kN);
669
670}
671
672//_____________________________________________________________________________
673Double_t AliTRDsim::GetMuHe(Double_t energyMeV)
674{
675 //
676 // Returns the photon absorbtion cross section for helium
677 //
678
679 const Int_t kN = 36;
680
681 Double_t mu[kN] = { 6.084E+01, 1.676E+01, 6.863E+00
682 , 2.007E+00, 9.329E-01, 5.766E-01
683 , 4.195E-01, 2.933E-01, 2.476E-01
684 , 2.092E-01, 1.960E-01, 1.838E-01
685 , 1.763E-01, 1.703E-01, 1.651E-01
686 , 1.562E-01, 1.486E-01, 1.336E-01
687 , 1.224E-01, 1.064E-01, 9.535E-02
688 , 8.707E-02, 8.054E-02, 7.076E-02
689 , 6.362E-02, 5.688E-02, 5.173E-02
690 , 4.422E-02, 3.503E-02, 2.949E-02
691 , 2.577E-02, 2.307E-02, 1.940E-02
692 , 1.703E-02, 1.363E-02, 1.183E-02 };
693
694 Double_t en[kN] = { 1.00000E-03, 1.50000E-03, 2.00000E-03
695 , 3.00000E-03, 4.00000E-03, 5.00000E-03
696 , 6.00000E-03, 8.00000E-03, 1.00000E-02
697 , 1.50000E-02, 2.00000E-02, 3.00000E-02
698 , 4.00000E-02, 5.00000E-02, 6.00000E-02
699 , 8.00000E-02, 1.00000E-01, 1.50000E-01
700 , 2.00000E-01, 3.00000E-01, 4.00000E-01
701 , 5.00000E-01, 6.00000E-01, 8.00000E-01
702 , 1.00000E+00, 1.25000E+00, 1.50000E+00
703 , 2.00000E+00, 3.00000E+00, 4.00000E+00
704 , 5.00000E+00, 6.00000E+00, 8.00000E+00
705 , 1.00000E+01, 1.50000E+01, 2.00000E+01 };
706
707 return Interpolate(energyMeV,en,mu,kN);
708
709}
710
842287f2 711//_____________________________________________________________________________
712Double_t AliTRDsim::GetMuAi(Double_t energyMeV)
713{
714 //
715 // Returns the photon absorbtion cross section for air
716 // Implemented by Oliver Busch
717 //
718
719 const Int_t kN = 38;
720
721 Double_t mu[kN] = { 0.35854E+04, 0.11841E+04, 0.52458E+03,
722 0.16143E+03, 0.14250E+03, 0.15722E+03,
723 0.77538E+02, 0.40099E+02, 0.23313E+02,
724 0.98816E+01, 0.51000E+01, 0.16079E+01,
725 0.77536E+00, 0.35282E+00, 0.24790E+00,
726 0.20750E+00, 0.18703E+00, 0.16589E+00,
727 0.15375E+00, 0.13530E+00, 0.12311E+00,
728 0.10654E+00, 0.95297E-01, 0.86939E-01,
729 0.80390E-01, 0.70596E-01, 0.63452E-01,
730 0.56754E-01, 0.51644E-01, 0.44382E-01,
731 0.35733E-01, 0.30721E-01, 0.27450E-01,
732 0.25171E-01, 0.22205E-01, 0.20399E-01,
733 0.18053E-01, 0.18057E-01 };
734
735
736
737 Double_t en[kN] = { 0.10000E-02, 0.15000E-02, 0.20000E-02,
738 0.30000E-02, 0.32029E-02, 0.32029E-02,
739 0.40000E-02, 0.50000E-02, 0.60000E-02,
740 0.80000E-02, 0.10000E-01, 0.15000E-01,
741 0.20000E-01, 0.30000E-01, 0.40000E-01,
742 0.50000E-01, 0.60000E-01, 0.80000E-01,
743 0.10000E+00, 0.15000E+00, 0.20000E+00,
744 0.30000E+00, 0.40000E+00, 0.50000E+00,
745 0.60000E+00, 0.80000E+00, 0.10000E+01,
746 0.12500E+01, 0.15000E+01, 0.20000E+01,
747 0.30000E+01, 0.40000E+01, 0.50000E+01,
748 0.60000E+01, 0.80000E+01, 0.10000E+02,
749 0.15000E+02, 0.20000E+02 };
750
751 return Interpolate(energyMeV,en,mu,kN);
752
753}
754
46d29e70 755//_____________________________________________________________________________
756Double_t AliTRDsim::Interpolate(Double_t energyMeV
757 , Double_t *en, Double_t *mu, Int_t n)
758{
759 //
760 // Interpolates the photon absorbtion cross section
761 // for a given energy <energyMeV>.
762 //
763
764 Double_t de = 0;
765 Int_t index = 0;
766 Int_t istat = Locate(en,n,energyMeV,index,de);
767 if (istat == 0) {
768 return (mu[index] - de * (mu[index] - mu[index+1])
769 / (en[index+1] - en[index] ));
770 }
771 else {
772 return 0.0;
773 }
774
775}
776
777//_____________________________________________________________________________
778Int_t AliTRDsim::Locate(Double_t *xv, Int_t n, Double_t xval
779 , Int_t &kl, Double_t &dx)
780{
781 //
782 // Locates a point (xval) in a 1-dim grid (xv(n))
783 //
784
785 if (xval >= xv[n-1]) return 1;
786 if (xval < xv[0]) return -1;
787
788 Int_t km;
789 Int_t kh = n - 1;
790
791 kl = 0;
792 while (kh - kl > 1) {
793 if (xval < xv[km = (kl+kh)/2]) kh = km;
794 else kl = km;
795 }
796 if (xval < xv[kl] || xval > xv[kl+1] || kl >= n-1) {
797 printf("Locate failed xv[%d] %f xval %f xv[%d] %f!!!\n"
798 ,kl,xv[kl],xval,kl+1,xv[kl+1]);
799 exit(1);
800 }
801
802 dx = xval - xv[kl];
803
804 return 0;
805
806}
0142cb22 807
808//_____________________________________________________________________________
809Int_t AliTRDsim::SelectNFoils(Float_t p)
810{
811 //
812 // Selects the number of foils corresponding to the momentum
813 //
814
815 Int_t foils = fNFoils[fNFoilsDim-1];
816
817 for (Int_t iFoil = 0; iFoil < fNFoilsDim; iFoil++) {
818 if (p < fNFoilsUp[iFoil]) {
819 foils = fNFoils[iFoil];
820 break;
821 }
822 }
823
824 return foils;
825
826}