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99336540 | 1 | |
46d29e70 | 2 | /************************************************************************** |
3 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
4 | * * | |
5 | * Author: The ALICE Off-line Project. * | |
6 | * Contributors are mentioned in the code where appropriate. * | |
7 | * * | |
8 | * Permission to use, copy, modify and distribute this software and its * | |
9 | * documentation strictly for non-commercial purposes is hereby granted * | |
10 | * without fee, provided that the above copyright notice appears in all * | |
11 | * copies and that both the copyright notice and this permission notice * | |
12 | * appear in the supporting documentation. The authors make no claims * | |
13 | * about the suitability of this software for any purpose. It is * | |
14 | * provided "as is" without express or implied warranty. * | |
15 | **************************************************************************/ | |
16 | ||
88cb7938 | 17 | /* $Id$ */ |
46d29e70 | 18 | |
19 | /////////////////////////////////////////////////////////////////////////////// | |
20 | // // | |
21 | // TRD simulation - multimodule (regular rad.) // | |
22 | // after: M. CASTELLANO et al., COMP. PHYS. COMM. 51 (1988) 431 // | |
23 | // + COMP. PHYS. COMM. 61 (1990) 395 // | |
24 | // // | |
25 | // 17.07.1998 - A.Andronic // | |
26 | // 08.12.1998 - simplified version // | |
27 | // 11.07.2000 - Adapted code to aliroot environment (C.Blume) // | |
0142cb22 | 28 | // 04.06.2004 - Momentum dependent parameters implemented (CBL) // |
46d29e70 | 29 | // // |
30 | /////////////////////////////////////////////////////////////////////////////// | |
31 | ||
32 | #include <stdlib.h> | |
33 | ||
0e9c2ad5 | 34 | #include <TH1.h> |
35 | #include <TRandom.h> | |
36 | #include <TMath.h> | |
37 | #include <TParticle.h> | |
46d29e70 | 38 | |
46d29e70 | 39 | #include "AliModule.h" |
40 | ||
0e9c2ad5 | 41 | #include "AliTRDsim.h" |
42 | ||
46d29e70 | 43 | ClassImp(AliTRDsim) |
44 | ||
45 | //_____________________________________________________________________________ | |
46 | AliTRDsim::AliTRDsim():TObject() | |
47 | { | |
48 | // | |
49 | // AliTRDsim default constructor | |
50 | // | |
51 | ||
fa5e892a | 52 | fSpectrum = 0; |
d1b06c24 | 53 | fSigma = 0; |
0142cb22 | 54 | fNFoils = 0; |
55 | fNFoilsUp = 0; | |
fa5e892a | 56 | |
46d29e70 | 57 | Init(); |
58 | ||
59 | } | |
60 | ||
61 | //_____________________________________________________________________________ | |
62 | AliTRDsim::AliTRDsim(AliModule *mod, Int_t foil, Int_t gap) | |
63 | { | |
64 | // | |
65 | // AliTRDsim constructor. Takes the material properties of the radiator | |
66 | // foils and the gas in the gaps from AliModule <mod>. | |
67 | // The default number of foils is 100 with a thickness of 20 mu. The | |
68 | // thickness of the gaps is 500 mu. | |
69 | // | |
70 | ||
71 | Float_t aFoil, zFoil, rhoFoil; | |
72 | Float_t aGap, zGap, rhoGap; | |
73 | Float_t rad, abs; | |
74 | Char_t name[21]; | |
75 | ||
fa5e892a | 76 | fSpectrum = 0; |
d1b06c24 | 77 | fSigma = 0; |
0142cb22 | 78 | fNFoils = 0; |
79 | fNFoilsUp = 0; | |
fa5e892a | 80 | |
46d29e70 | 81 | Init(); |
82 | ||
83 | mod->AliGetMaterial(foil,name,aFoil,zFoil,rhoFoil,rad,abs); | |
84 | mod->AliGetMaterial(gap ,name,aGap ,zGap ,rhoGap ,rad,abs); | |
85 | ||
86 | fFoilDens = rhoFoil; | |
87 | fFoilA = aFoil; | |
88 | fFoilZ = zFoil; | |
89 | fFoilOmega = Omega(fFoilDens,fFoilZ,fFoilA); | |
90 | ||
91 | fGapDens = rhoGap; | |
92 | fGapA = aGap; | |
93 | fGapZ = zGap; | |
94 | fGapOmega = Omega(fGapDens ,fGapZ ,fGapA ); | |
95 | ||
96 | } | |
97 | ||
98 | //_____________________________________________________________________________ | |
73ae7b59 | 99 | AliTRDsim::AliTRDsim(const AliTRDsim &s):TObject(s) |
46d29e70 | 100 | { |
101 | // | |
102 | // AliTRDsim copy constructor | |
103 | // | |
104 | ||
105 | ((AliTRDsim &) s).Copy(*this); | |
106 | ||
107 | } | |
108 | ||
109 | //_____________________________________________________________________________ | |
110 | AliTRDsim::~AliTRDsim() | |
111 | { | |
112 | // | |
113 | // AliTRDsim destructor | |
114 | // | |
115 | ||
5567246e | 116 | // if (fSpectrum) delete fSpectrum; |
117 | if (fSigma) delete [] fSigma; | |
0142cb22 | 118 | if (fNFoils) delete [] fNFoils; |
119 | if (fNFoilsUp) delete [] fNFoilsUp; | |
46d29e70 | 120 | |
121 | } | |
122 | ||
123 | //_____________________________________________________________________________ | |
124 | AliTRDsim &AliTRDsim::operator=(const AliTRDsim &s) | |
125 | { | |
126 | // | |
127 | // Assignment operator | |
128 | // | |
129 | ||
130 | if (this != &s) ((AliTRDsim &) s).Copy(*this); | |
131 | return *this; | |
132 | ||
133 | } | |
134 | ||
135 | //_____________________________________________________________________________ | |
e0d47c25 | 136 | void AliTRDsim::Copy(TObject &s) const |
46d29e70 | 137 | { |
138 | // | |
139 | // Copy function | |
140 | // | |
141 | ||
46d29e70 | 142 | ((AliTRDsim &) s).fFoilThick = fFoilThick; |
143 | ((AliTRDsim &) s).fFoilDens = fFoilDens; | |
144 | ((AliTRDsim &) s).fFoilOmega = fFoilOmega; | |
145 | ((AliTRDsim &) s).fFoilZ = fFoilZ; | |
146 | ((AliTRDsim &) s).fFoilA = fFoilA; | |
147 | ((AliTRDsim &) s).fGapThick = fGapThick; | |
148 | ((AliTRDsim &) s).fGapDens = fGapDens; | |
149 | ((AliTRDsim &) s).fGapOmega = fGapOmega; | |
150 | ((AliTRDsim &) s).fGapZ = fGapZ; | |
151 | ((AliTRDsim &) s).fGapA = fGapA; | |
152 | ((AliTRDsim &) s).fTemp = fTemp; | |
153 | ((AliTRDsim &) s).fSpNBins = fSpNBins; | |
154 | ((AliTRDsim &) s).fSpRange = fSpRange; | |
155 | ((AliTRDsim &) s).fSpBinWidth = fSpBinWidth; | |
156 | ((AliTRDsim &) s).fSpLower = fSpLower; | |
157 | ((AliTRDsim &) s).fSpUpper = fSpUpper; | |
158 | ||
0142cb22 | 159 | if (((AliTRDsim &) s).fNFoils) delete [] ((AliTRDsim &) s).fNFoils; |
160 | ((AliTRDsim &) s).fNFoils = new Int_t[fNFoilsDim]; | |
161 | for (Int_t iFoil = 0; iFoil < fNFoilsDim; iFoil++) { | |
162 | ((AliTRDsim &) s).fNFoils[iFoil] = fNFoils[iFoil]; | |
163 | } | |
164 | ||
165 | if (((AliTRDsim &) s).fNFoilsUp) delete [] ((AliTRDsim &) s).fNFoilsUp; | |
166 | ((AliTRDsim &) s).fNFoilsUp = new Double_t[fNFoilsDim]; | |
167 | for (Int_t iFoil = 0; iFoil < fNFoilsDim; iFoil++) { | |
168 | ((AliTRDsim &) s).fNFoilsUp[iFoil] = fNFoilsUp[iFoil]; | |
169 | } | |
170 | ||
171 | if (((AliTRDsim &) s).fSigma) delete [] ((AliTRDsim &) s).fSigma; | |
46d29e70 | 172 | ((AliTRDsim &) s).fSigma = new Double_t[fSpNBins]; |
173 | for (Int_t iBin = 0; iBin < fSpNBins; iBin++) { | |
174 | ((AliTRDsim &) s).fSigma[iBin] = fSigma[iBin]; | |
175 | } | |
176 | ||
177 | fSpectrum->Copy(*((AliTRDsim &) s).fSpectrum); | |
178 | ||
179 | } | |
180 | ||
181 | //_____________________________________________________________________________ | |
182 | void AliTRDsim::Init() | |
183 | { | |
184 | // | |
185 | // Initialization | |
0142cb22 | 186 | // The default radiator are prolypropilene foils of 10 mu thickness |
187 | // with gaps of 80 mu filled with N2. | |
46d29e70 | 188 | // |
189 | ||
0142cb22 | 190 | fNFoilsDim = 7; |
191 | ||
192 | if (fNFoils) delete [] fNFoils; | |
193 | fNFoils = new Int_t[fNFoilsDim]; | |
194 | fNFoils[0] = 170; | |
99336540 | 195 | fNFoils[1] = 225; //250; |
196 | fNFoils[2] = 275; //310; | |
197 | fNFoils[3] = 305; //380; | |
198 | fNFoils[4] = 325; //430; | |
199 | fNFoils[5] = 340; //490; | |
200 | fNFoils[6] = 350; //550; | |
0142cb22 | 201 | |
202 | if (fNFoilsUp) delete [] fNFoilsUp; | |
203 | fNFoilsUp = new Double_t[fNFoilsDim]; | |
204 | fNFoilsUp[0] = 1.25; | |
205 | fNFoilsUp[1] = 1.75; | |
206 | fNFoilsUp[2] = 2.50; | |
207 | fNFoilsUp[3] = 3.50; | |
208 | fNFoilsUp[4] = 4.50; | |
209 | fNFoilsUp[5] = 5.50; | |
210 | fNFoilsUp[6] = 10000.0; | |
46d29e70 | 211 | |
db30bf0f | 212 | fFoilThick = 0.0013; |
46d29e70 | 213 | fFoilDens = 0.92; |
214 | fFoilZ = 5.28571; | |
215 | fFoilA = 10.4286; | |
216 | fFoilOmega = Omega(fFoilDens,fFoilZ,fFoilA); | |
217 | ||
db30bf0f | 218 | fGapThick = 0.0060; |
0142cb22 | 219 | fGapDens = 0.00125; |
220 | fGapZ = 7.0; | |
221 | fGapA = 14.00674; | |
46d29e70 | 222 | fGapOmega = Omega(fGapDens ,fGapZ ,fGapA ); |
223 | ||
224 | fTemp = 293.16; | |
225 | ||
226 | fSpNBins = 200; | |
227 | fSpRange = 100; | |
228 | fSpBinWidth = fSpRange / fSpNBins; | |
229 | fSpLower = 1.0 - 0.5 * fSpBinWidth; | |
230 | fSpUpper = fSpLower + fSpRange; | |
231 | ||
232 | if (fSpectrum) delete fSpectrum; | |
233 | fSpectrum = new TH1D("TRspectrum","TR spectrum",fSpNBins,fSpLower,fSpUpper); | |
abaf1f1d | 234 | fSpectrum->SetDirectory(0); |
46d29e70 | 235 | |
236 | // Set the sigma values | |
237 | SetSigma(); | |
238 | ||
239 | } | |
240 | ||
241 | //_____________________________________________________________________________ | |
242 | Int_t AliTRDsim::CreatePhotons(Int_t pdg, Float_t p | |
243 | , Int_t &nPhoton, Float_t *ePhoton) | |
244 | { | |
245 | // | |
246 | // Create TRD photons for a charged particle of type <pdg> with the total | |
247 | // momentum <p>. | |
248 | // Number of produced TR photons: <nPhoton> | |
249 | // Energies of the produced TR photons: <ePhoton> | |
250 | // | |
251 | ||
252 | // PDG codes | |
253 | const Int_t kPdgEle = 11; | |
254 | const Int_t kPdgMuon = 13; | |
255 | const Int_t kPdgPion = 211; | |
256 | const Int_t kPdgKaon = 321; | |
257 | ||
258 | Float_t mass = 0; | |
259 | switch (TMath::Abs(pdg)) { | |
260 | case kPdgEle: | |
261 | mass = 5.11e-4; | |
262 | break; | |
263 | case kPdgMuon: | |
264 | mass = 0.10566; | |
265 | break; | |
266 | case kPdgPion: | |
267 | mass = 0.13957; | |
268 | break; | |
269 | case kPdgKaon: | |
270 | mass = 0.4937; | |
271 | break; | |
272 | default: | |
273 | return 0; | |
274 | break; | |
275 | }; | |
276 | ||
46d29e70 | 277 | // Calculate the TR photons |
0142cb22 | 278 | return TrPhotons(p, mass, nPhoton, ePhoton); |
46d29e70 | 279 | |
280 | } | |
281 | ||
282 | //_____________________________________________________________________________ | |
0142cb22 | 283 | Int_t AliTRDsim::TrPhotons(Float_t p, Float_t mass |
284 | , Int_t &nPhoton, Float_t *ePhoton) | |
46d29e70 | 285 | { |
286 | // | |
287 | // Produces TR photons. | |
288 | // | |
289 | ||
290 | const Double_t kAlpha = 0.0072973; | |
99336540 | 291 | const Int_t kSumMax = 30; |
292 | ||
293 | Double_t tau = fGapThick / fFoilThick; | |
46d29e70 | 294 | |
0142cb22 | 295 | // Calculate gamma |
296 | Double_t gamma = TMath::Sqrt(p*p + mass*mass) / mass; | |
297 | ||
298 | // Select the number of foils corresponding to momentum | |
299 | Int_t foils = SelectNFoils(p); | |
300 | ||
46d29e70 | 301 | fSpectrum->Reset(); |
302 | ||
303 | // The TR spectrum | |
99336540 | 304 | Double_t csi1,csi2,rho1,rho2; |
305 | Double_t fSigma,Sum,Nequ,theta_n,aux; | |
306 | Double_t energyeV, energykeV; | |
307 | for (Int_t iBin = 1; iBin <= fSpNBins; iBin++) { | |
308 | energykeV = fSpectrum->GetBinCenter(iBin); | |
309 | energyeV = energykeV * 1.e3; | |
46d29e70 | 310 | |
99336540 | 311 | fSigma = Sigma(energykeV); |
46d29e70 | 312 | |
99336540 | 313 | csi1 = fFoilOmega / energyeV; |
314 | csi2 = fGapOmega / energyeV; | |
46d29e70 | 315 | |
99336540 | 316 | rho1 = 2.5 * energyeV * fFoilThick * 1.E4 |
317 | * (1. / (gamma*gamma) + csi1*csi1); | |
318 | rho2 = 2.5 * energyeV * fFoilThick * 1.E4 | |
319 | * (1.0 / (gamma*gamma) + csi2 *csi2); | |
46d29e70 | 320 | |
321 | // Calculate the sum | |
99336540 | 322 | Sum = 0; |
323 | for (Int_t n = 1; n <= kSumMax; n++) { | |
324 | theta_n = (TMath::Pi() * 2.0 * n - (rho1 + tau * rho2)) / (1.+ tau); | |
325 | if (theta_n < 0.) theta_n = 0.0; | |
326 | aux = 1. / (rho1 + theta_n) - 1. / (rho2 + theta_n); | |
327 | Sum += theta_n * (aux*aux) * (1.0 - TMath::Cos(rho1 + theta_n)); | |
46d29e70 | 328 | } |
329 | ||
99336540 | 330 | // Equivalent number of foils |
331 | Nequ = (1. - TMath::Exp(-foils * fSigma)) / (1.- TMath::Exp(-fSigma)); | |
46d29e70 | 332 | |
46d29e70 | 333 | |
334 | // dN / domega | |
99336540 | 335 | fSpectrum->SetBinContent(iBin,4. * kAlpha * Nequ * Sum / (energykeV * (1. + tau))); |
46d29e70 | 336 | } |
337 | ||
338 | // <nTR> (binsize corr.) | |
99336540 | 339 | Float_t ntr = fSpBinWidth*fSpectrum->Integral(); |
46d29e70 | 340 | // Number of TR photons from Poisson distribution with mean <ntr> |
341 | nPhoton = gRandom->Poisson(ntr); | |
342 | // Energy of the TR photons | |
343 | for (Int_t iPhoton = 0; iPhoton < nPhoton; iPhoton++) { | |
344 | ePhoton[iPhoton] = fSpectrum->GetRandom(); | |
345 | } | |
346 | ||
347 | return 1; | |
348 | ||
349 | } | |
350 | ||
351 | //_____________________________________________________________________________ | |
352 | void AliTRDsim::SetSigma() | |
353 | { | |
354 | // | |
355 | // Sets the absorbtion crosssection for the energies of the TR spectrum | |
356 | // | |
357 | ||
5567246e | 358 | if (fSigma) delete [] fSigma; |
46d29e70 | 359 | fSigma = new Double_t[fSpNBins]; |
360 | for (Int_t iBin = 0; iBin < fSpNBins; iBin++) { | |
361 | Double_t energykeV = iBin * fSpBinWidth + 1.0; | |
362 | fSigma[iBin] = Sigma(energykeV); | |
363 | //printf("SetSigma(): iBin = %d fSigma %g\n",iBin,fSigma[iBin]); | |
364 | } | |
365 | ||
366 | } | |
367 | ||
368 | //_____________________________________________________________________________ | |
369 | Double_t AliTRDsim::Sigma(Double_t energykeV) | |
370 | { | |
371 | // | |
372 | // Calculates the absorbtion crosssection for a one-foil-one-gap-radiator | |
373 | // | |
374 | ||
46d29e70 | 375 | // keV -> MeV |
376 | Double_t energyMeV = energykeV * 0.001; | |
377 | if (energyMeV >= 0.001) { | |
842287f2 | 378 | return(GetMuPo(energyMeV) * fFoilDens * fFoilThick + |
379 | GetMuAi(energyMeV) * fGapDens * fGapThick * GetTemp()); | |
46d29e70 | 380 | } |
381 | else { | |
382 | return 1e6; | |
383 | } | |
384 | ||
385 | } | |
386 | ||
387 | //_____________________________________________________________________________ | |
388 | Double_t AliTRDsim::GetMuPo(Double_t energyMeV) | |
389 | { | |
390 | // | |
391 | // Returns the photon absorbtion cross section for polypropylene | |
392 | // | |
393 | ||
394 | const Int_t kN = 36; | |
395 | ||
396 | Double_t mu[kN] = { 1.894E+03, 5.999E+02, 2.593E+02 | |
397 | , 7.743E+01, 3.242E+01, 1.643E+01 | |
398 | , 9.432E+00, 3.975E+00, 2.088E+00 | |
399 | , 7.452E-01, 4.315E-01, 2.706E-01 | |
400 | , 2.275E-01, 2.084E-01, 1.970E-01 | |
401 | , 1.823E-01, 1.719E-01, 1.534E-01 | |
402 | , 1.402E-01, 1.217E-01, 1.089E-01 | |
403 | , 9.947E-02, 9.198E-02, 8.078E-02 | |
404 | , 7.262E-02, 6.495E-02, 5.910E-02 | |
405 | , 5.064E-02, 4.045E-02, 3.444E-02 | |
406 | , 3.045E-02, 2.760E-02, 2.383E-02 | |
407 | , 2.145E-02, 1.819E-02, 1.658E-02 }; | |
408 | ||
409 | Double_t en[kN] = { 1.000E-03, 1.500E-03, 2.000E-03 | |
410 | , 3.000E-03, 4.000E-03, 5.000E-03 | |
411 | , 6.000E-03, 8.000E-03, 1.000E-02 | |
412 | , 1.500E-02, 2.000E-02, 3.000E-02 | |
413 | , 4.000E-02, 5.000E-02, 6.000E-02 | |
414 | , 8.000E-02, 1.000E-01, 1.500E-01 | |
415 | , 2.000E-01, 3.000E-01, 4.000E-01 | |
416 | , 5.000E-01, 6.000E-01, 8.000E-01 | |
417 | , 1.000E+00, 1.250E+00, 1.500E+00 | |
418 | , 2.000E+00, 3.000E+00, 4.000E+00 | |
419 | , 5.000E+00, 6.000E+00, 8.000E+00 | |
420 | , 1.000E+01, 1.500E+01, 2.000E+01 }; | |
421 | ||
422 | return Interpolate(energyMeV,en,mu,kN); | |
423 | ||
424 | } | |
425 | ||
426 | //_____________________________________________________________________________ | |
427 | Double_t AliTRDsim::GetMuCO(Double_t energyMeV) | |
428 | { | |
429 | // | |
430 | // Returns the photon absorbtion cross section for CO2 | |
431 | // | |
432 | ||
433 | const Int_t kN = 36; | |
434 | ||
435 | Double_t mu[kN] = { 0.39383E+04, 0.13166E+04, 0.58750E+03 | |
436 | , 0.18240E+03, 0.77996E+02, 0.40024E+02 | |
437 | , 0.23116E+02, 0.96997E+01, 0.49726E+01 | |
438 | , 0.15543E+01, 0.74915E+00, 0.34442E+00 | |
439 | , 0.24440E+00, 0.20589E+00, 0.18632E+00 | |
440 | , 0.16578E+00, 0.15394E+00, 0.13558E+00 | |
441 | , 0.12336E+00, 0.10678E+00, 0.95510E-01 | |
442 | , 0.87165E-01, 0.80587E-01, 0.70769E-01 | |
443 | , 0.63626E-01, 0.56894E-01, 0.51782E-01 | |
444 | , 0.44499E-01, 0.35839E-01, 0.30825E-01 | |
445 | , 0.27555E-01, 0.25269E-01, 0.22311E-01 | |
446 | , 0.20516E-01, 0.18184E-01, 0.17152E-01 }; | |
447 | ||
448 | Double_t en[kN] = { 0.10000E-02, 0.15000E-02, 0.20000E-02 | |
449 | , 0.30000E-02, 0.40000E-02, 0.50000E-02 | |
450 | , 0.60000E-02, 0.80000E-02, 0.10000E-01 | |
451 | , 0.15000E-01, 0.20000E-01, 0.30000E-01 | |
452 | , 0.40000E-01, 0.50000E-01, 0.60000E-01 | |
453 | , 0.80000E-01, 0.10000E+00, 0.15000E+00 | |
454 | , 0.20000E+00, 0.30000E+00, 0.40000E+00 | |
455 | , 0.50000E+00, 0.60000E+00, 0.80000E+00 | |
456 | , 0.10000E+01, 0.12500E+01, 0.15000E+01 | |
457 | , 0.20000E+01, 0.30000E+01, 0.40000E+01 | |
458 | , 0.50000E+01, 0.60000E+01, 0.80000E+01 | |
459 | , 0.10000E+02, 0.15000E+02, 0.20000E+02 }; | |
460 | ||
461 | return Interpolate(energyMeV,en,mu,kN); | |
462 | ||
463 | } | |
464 | ||
465 | //_____________________________________________________________________________ | |
466 | Double_t AliTRDsim::GetMuXe(Double_t energyMeV) | |
467 | { | |
468 | // | |
469 | // Returns the photon absorbtion cross section for xenon | |
470 | // | |
471 | ||
472 | const Int_t kN = 48; | |
473 | ||
474 | Double_t mu[kN] = { 9.413E+03, 8.151E+03, 7.035E+03 | |
475 | , 7.338E+03, 4.085E+03, 2.088E+03 | |
476 | , 7.780E+02, 3.787E+02, 2.408E+02 | |
477 | , 6.941E+02, 6.392E+02, 6.044E+02 | |
478 | , 8.181E+02, 7.579E+02, 6.991E+02 | |
479 | , 8.064E+02, 6.376E+02, 3.032E+02 | |
480 | , 1.690E+02, 5.743E+01, 2.652E+01 | |
481 | , 8.930E+00, 6.129E+00, 3.316E+01 | |
482 | , 2.270E+01, 1.272E+01, 7.825E+00 | |
483 | , 3.633E+00, 2.011E+00, 7.202E-01 | |
484 | , 3.760E-01, 1.797E-01, 1.223E-01 | |
485 | , 9.699E-02, 8.281E-02, 6.696E-02 | |
486 | , 5.785E-02, 5.054E-02, 4.594E-02 | |
487 | , 4.078E-02, 3.681E-02, 3.577E-02 | |
488 | , 3.583E-02, 3.634E-02, 3.797E-02 | |
489 | , 3.987E-02, 4.445E-02, 4.815E-02 }; | |
490 | ||
491 | Double_t en[kN] = { 1.00000E-03, 1.07191E-03, 1.14900E-03 | |
492 | , 1.14900E-03, 1.50000E-03, 2.00000E-03 | |
493 | , 3.00000E-03, 4.00000E-03, 4.78220E-03 | |
494 | , 4.78220E-03, 5.00000E-03, 5.10370E-03 | |
495 | , 5.10370E-03, 5.27536E-03, 5.45280E-03 | |
496 | , 5.45280E-03, 6.00000E-03, 8.00000E-03 | |
497 | , 1.00000E-02, 1.50000E-02, 2.00000E-02 | |
498 | , 3.00000E-02, 3.45614E-02, 3.45614E-02 | |
499 | , 4.00000E-02, 5.00000E-02, 6.00000E-02 | |
500 | , 8.00000E-02, 1.00000E-01, 1.50000E-01 | |
501 | , 2.00000E-01, 3.00000E-01, 4.00000E-01 | |
502 | , 5.00000E-01, 6.00000E-01, 8.00000E-01 | |
503 | , 1.00000E+00, 1.25000E+00, 1.50000E+00 | |
504 | , 2.00000E+00, 3.00000E+00, 4.00000E+00 | |
505 | , 5.00000E+00, 6.00000E+00, 8.00000E+00 | |
506 | , 1.00000E+01, 1.50000E+01, 2.00000E+01 }; | |
507 | ||
508 | return Interpolate(energyMeV,en,mu,kN); | |
509 | ||
510 | } | |
511 | ||
512 | //_____________________________________________________________________________ | |
513 | Double_t AliTRDsim::GetMuBu(Double_t energyMeV) | |
514 | { | |
515 | // | |
516 | // Returns the photon absorbtion cross section for isobutane | |
517 | // | |
518 | ||
519 | const Int_t kN = 36; | |
520 | ||
521 | Double_t mu[kN] = { 0.38846E+03, 0.12291E+03, 0.53225E+02 | |
522 | , 0.16091E+02, 0.69114E+01, 0.36541E+01 | |
523 | , 0.22282E+01, 0.11149E+01, 0.72887E+00 | |
524 | , 0.45053E+00, 0.38167E+00, 0.33920E+00 | |
525 | , 0.32155E+00, 0.30949E+00, 0.29960E+00 | |
526 | , 0.28317E+00, 0.26937E+00, 0.24228E+00 | |
527 | , 0.22190E+00, 0.19289E+00, 0.17288E+00 | |
528 | , 0.15789E+00, 0.14602E+00, 0.12829E+00 | |
529 | , 0.11533E+00, 0.10310E+00, 0.93790E-01 | |
530 | , 0.80117E-01, 0.63330E-01, 0.53229E-01 | |
531 | , 0.46390E-01, 0.41425E-01, 0.34668E-01 | |
532 | , 0.30267E-01, 0.23910E-01, 0.20509E-01 }; | |
533 | ||
534 | Double_t en[kN] = { 0.10000E-02, 0.15000E-02, 0.20000E-02 | |
535 | , 0.30000E-02, 0.40000E-02, 0.50000E-02 | |
536 | , 0.60000E-02, 0.80000E-02, 0.10000E-01 | |
537 | , 0.15000E-01, 0.20000E-01, 0.30000E-01 | |
538 | , 0.40000E-01, 0.50000E-01, 0.60000E-01 | |
539 | , 0.80000E-01, 0.10000E+00, 0.15000E+00 | |
540 | , 0.20000E+00, 0.30000E+00, 0.40000E+00 | |
541 | , 0.50000E+00, 0.60000E+00, 0.80000E+00 | |
542 | , 0.10000E+01, 0.12500E+01, 0.15000E+01 | |
543 | , 0.20000E+01, 0.30000E+01, 0.40000E+01 | |
544 | , 0.50000E+01, 0.60000E+01, 0.80000E+01 | |
545 | , 0.10000E+02, 0.15000E+02, 0.20000E+02 }; | |
546 | ||
547 | return Interpolate(energyMeV,en,mu,kN); | |
548 | ||
549 | } | |
550 | ||
551 | //_____________________________________________________________________________ | |
552 | Double_t AliTRDsim::GetMuMy(Double_t energyMeV) | |
553 | { | |
554 | // | |
555 | // Returns the photon absorbtion cross section for mylar | |
556 | // | |
557 | ||
558 | const Int_t kN = 36; | |
559 | ||
560 | Double_t mu[kN] = { 2.911E+03, 9.536E+02, 4.206E+02 | |
561 | , 1.288E+02, 5.466E+01, 2.792E+01 | |
562 | , 1.608E+01, 6.750E+00, 3.481E+00 | |
563 | , 1.132E+00, 5.798E-01, 3.009E-01 | |
564 | , 2.304E-01, 2.020E-01, 1.868E-01 | |
565 | , 1.695E-01, 1.586E-01, 1.406E-01 | |
566 | , 1.282E-01, 1.111E-01, 9.947E-02 | |
567 | , 9.079E-02, 8.395E-02, 7.372E-02 | |
568 | , 6.628E-02, 5.927E-02, 5.395E-02 | |
569 | , 4.630E-02, 3.715E-02, 3.181E-02 | |
570 | , 2.829E-02, 2.582E-02, 2.257E-02 | |
571 | , 2.057E-02, 1.789E-02, 1.664E-02 }; | |
572 | ||
573 | Double_t en[kN] = { 1.00000E-03, 1.50000E-03, 2.00000E-03 | |
574 | , 3.00000E-03, 4.00000E-03, 5.00000E-03 | |
575 | , 6.00000E-03, 8.00000E-03, 1.00000E-02 | |
576 | , 1.50000E-02, 2.00000E-02, 3.00000E-02 | |
577 | , 4.00000E-02, 5.00000E-02, 6.00000E-02 | |
578 | , 8.00000E-02, 1.00000E-01, 1.50000E-01 | |
579 | , 2.00000E-01, 3.00000E-01, 4.00000E-01 | |
580 | , 5.00000E-01, 6.00000E-01, 8.00000E-01 | |
581 | , 1.00000E+00, 1.25000E+00, 1.50000E+00 | |
582 | , 2.00000E+00, 3.00000E+00, 4.00000E+00 | |
583 | , 5.00000E+00, 6.00000E+00, 8.00000E+00 | |
584 | , 1.00000E+01, 1.50000E+01, 2.00000E+01 }; | |
585 | ||
586 | return Interpolate(energyMeV,en,mu,kN); | |
587 | ||
588 | } | |
589 | ||
590 | //_____________________________________________________________________________ | |
591 | Double_t AliTRDsim::GetMuN2(Double_t energyMeV) | |
592 | { | |
593 | // | |
594 | // Returns the photon absorbtion cross section for nitrogen | |
595 | // | |
596 | ||
597 | const Int_t kN = 36; | |
598 | ||
599 | Double_t mu[kN] = { 3.311E+03, 1.083E+03, 4.769E+02 | |
600 | , 1.456E+02, 6.166E+01, 3.144E+01 | |
601 | , 1.809E+01, 7.562E+00, 3.879E+00 | |
602 | , 1.236E+00, 6.178E-01, 3.066E-01 | |
603 | , 2.288E-01, 1.980E-01, 1.817E-01 | |
604 | , 1.639E-01, 1.529E-01, 1.353E-01 | |
605 | , 1.233E-01, 1.068E-01, 9.557E-02 | |
606 | , 8.719E-02, 8.063E-02, 7.081E-02 | |
607 | , 6.364E-02, 5.693E-02, 5.180E-02 | |
608 | , 4.450E-02, 3.579E-02, 3.073E-02 | |
609 | , 2.742E-02, 2.511E-02, 2.209E-02 | |
610 | , 2.024E-02, 1.782E-02, 1.673E-02 }; | |
611 | ||
612 | Double_t en[kN] = { 1.00000E-03, 1.50000E-03, 2.00000E-03 | |
613 | , 3.00000E-03, 4.00000E-03, 5.00000E-03 | |
614 | , 6.00000E-03, 8.00000E-03, 1.00000E-02 | |
615 | , 1.50000E-02, 2.00000E-02, 3.00000E-02 | |
616 | , 4.00000E-02, 5.00000E-02, 6.00000E-02 | |
617 | , 8.00000E-02, 1.00000E-01, 1.50000E-01 | |
618 | , 2.00000E-01, 3.00000E-01, 4.00000E-01 | |
619 | , 5.00000E-01, 6.00000E-01, 8.00000E-01 | |
620 | , 1.00000E+00, 1.25000E+00, 1.50000E+00 | |
621 | , 2.00000E+00, 3.00000E+00, 4.00000E+00 | |
622 | , 5.00000E+00, 6.00000E+00, 8.00000E+00 | |
623 | , 1.00000E+01, 1.50000E+01, 2.00000E+01 }; | |
624 | ||
625 | return Interpolate(energyMeV,en,mu,kN); | |
626 | ||
627 | } | |
628 | ||
629 | //_____________________________________________________________________________ | |
630 | Double_t AliTRDsim::GetMuO2(Double_t energyMeV) | |
631 | { | |
632 | // | |
633 | // Returns the photon absorbtion cross section for oxygen | |
634 | // | |
635 | ||
636 | const Int_t kN = 36; | |
637 | ||
638 | Double_t mu[kN] = { 4.590E+03, 1.549E+03, 6.949E+02 | |
639 | , 2.171E+02, 9.315E+01, 4.790E+01 | |
640 | , 2.770E+01, 1.163E+01, 5.952E+00 | |
641 | , 1.836E+00, 8.651E-01, 3.779E-01 | |
642 | , 2.585E-01, 2.132E-01, 1.907E-01 | |
643 | , 1.678E-01, 1.551E-01, 1.361E-01 | |
644 | , 1.237E-01, 1.070E-01, 9.566E-02 | |
645 | , 8.729E-02, 8.070E-02, 7.087E-02 | |
646 | , 6.372E-02, 5.697E-02, 5.185E-02 | |
647 | , 4.459E-02, 3.597E-02, 3.100E-02 | |
648 | , 2.777E-02, 2.552E-02, 2.263E-02 | |
649 | , 2.089E-02, 1.866E-02, 1.770E-02 }; | |
650 | ||
651 | Double_t en[kN] = { 1.00000E-03, 1.50000E-03, 2.00000E-03 | |
652 | , 3.00000E-03, 4.00000E-03, 5.00000E-03 | |
653 | , 6.00000E-03, 8.00000E-03, 1.00000E-02 | |
654 | , 1.50000E-02, 2.00000E-02, 3.00000E-02 | |
655 | , 4.00000E-02, 5.00000E-02, 6.00000E-02 | |
656 | , 8.00000E-02, 1.00000E-01, 1.50000E-01 | |
657 | , 2.00000E-01, 3.00000E-01, 4.00000E-01 | |
658 | , 5.00000E-01, 6.00000E-01, 8.00000E-01 | |
659 | , 1.00000E+00, 1.25000E+00, 1.50000E+00 | |
660 | , 2.00000E+00, 3.00000E+00, 4.00000E+00 | |
661 | , 5.00000E+00, 6.00000E+00, 8.00000E+00 | |
662 | , 1.00000E+01, 1.50000E+01, 2.00000E+01 }; | |
663 | ||
664 | return Interpolate(energyMeV,en,mu,kN); | |
665 | ||
666 | } | |
667 | ||
668 | //_____________________________________________________________________________ | |
669 | Double_t AliTRDsim::GetMuHe(Double_t energyMeV) | |
670 | { | |
671 | // | |
672 | // Returns the photon absorbtion cross section for helium | |
673 | // | |
674 | ||
675 | const Int_t kN = 36; | |
676 | ||
677 | Double_t mu[kN] = { 6.084E+01, 1.676E+01, 6.863E+00 | |
678 | , 2.007E+00, 9.329E-01, 5.766E-01 | |
679 | , 4.195E-01, 2.933E-01, 2.476E-01 | |
680 | , 2.092E-01, 1.960E-01, 1.838E-01 | |
681 | , 1.763E-01, 1.703E-01, 1.651E-01 | |
682 | , 1.562E-01, 1.486E-01, 1.336E-01 | |
683 | , 1.224E-01, 1.064E-01, 9.535E-02 | |
684 | , 8.707E-02, 8.054E-02, 7.076E-02 | |
685 | , 6.362E-02, 5.688E-02, 5.173E-02 | |
686 | , 4.422E-02, 3.503E-02, 2.949E-02 | |
687 | , 2.577E-02, 2.307E-02, 1.940E-02 | |
688 | , 1.703E-02, 1.363E-02, 1.183E-02 }; | |
689 | ||
690 | Double_t en[kN] = { 1.00000E-03, 1.50000E-03, 2.00000E-03 | |
691 | , 3.00000E-03, 4.00000E-03, 5.00000E-03 | |
692 | , 6.00000E-03, 8.00000E-03, 1.00000E-02 | |
693 | , 1.50000E-02, 2.00000E-02, 3.00000E-02 | |
694 | , 4.00000E-02, 5.00000E-02, 6.00000E-02 | |
695 | , 8.00000E-02, 1.00000E-01, 1.50000E-01 | |
696 | , 2.00000E-01, 3.00000E-01, 4.00000E-01 | |
697 | , 5.00000E-01, 6.00000E-01, 8.00000E-01 | |
698 | , 1.00000E+00, 1.25000E+00, 1.50000E+00 | |
699 | , 2.00000E+00, 3.00000E+00, 4.00000E+00 | |
700 | , 5.00000E+00, 6.00000E+00, 8.00000E+00 | |
701 | , 1.00000E+01, 1.50000E+01, 2.00000E+01 }; | |
702 | ||
703 | return Interpolate(energyMeV,en,mu,kN); | |
704 | ||
705 | } | |
706 | ||
842287f2 | 707 | //_____________________________________________________________________________ |
708 | Double_t AliTRDsim::GetMuAi(Double_t energyMeV) | |
709 | { | |
710 | // | |
711 | // Returns the photon absorbtion cross section for air | |
712 | // Implemented by Oliver Busch | |
713 | // | |
714 | ||
715 | const Int_t kN = 38; | |
716 | ||
717 | Double_t mu[kN] = { 0.35854E+04, 0.11841E+04, 0.52458E+03, | |
718 | 0.16143E+03, 0.14250E+03, 0.15722E+03, | |
719 | 0.77538E+02, 0.40099E+02, 0.23313E+02, | |
720 | 0.98816E+01, 0.51000E+01, 0.16079E+01, | |
721 | 0.77536E+00, 0.35282E+00, 0.24790E+00, | |
722 | 0.20750E+00, 0.18703E+00, 0.16589E+00, | |
723 | 0.15375E+00, 0.13530E+00, 0.12311E+00, | |
724 | 0.10654E+00, 0.95297E-01, 0.86939E-01, | |
725 | 0.80390E-01, 0.70596E-01, 0.63452E-01, | |
726 | 0.56754E-01, 0.51644E-01, 0.44382E-01, | |
727 | 0.35733E-01, 0.30721E-01, 0.27450E-01, | |
728 | 0.25171E-01, 0.22205E-01, 0.20399E-01, | |
729 | 0.18053E-01, 0.18057E-01 }; | |
730 | ||
731 | ||
732 | ||
733 | Double_t en[kN] = { 0.10000E-02, 0.15000E-02, 0.20000E-02, | |
734 | 0.30000E-02, 0.32029E-02, 0.32029E-02, | |
735 | 0.40000E-02, 0.50000E-02, 0.60000E-02, | |
736 | 0.80000E-02, 0.10000E-01, 0.15000E-01, | |
737 | 0.20000E-01, 0.30000E-01, 0.40000E-01, | |
738 | 0.50000E-01, 0.60000E-01, 0.80000E-01, | |
739 | 0.10000E+00, 0.15000E+00, 0.20000E+00, | |
740 | 0.30000E+00, 0.40000E+00, 0.50000E+00, | |
741 | 0.60000E+00, 0.80000E+00, 0.10000E+01, | |
742 | 0.12500E+01, 0.15000E+01, 0.20000E+01, | |
743 | 0.30000E+01, 0.40000E+01, 0.50000E+01, | |
744 | 0.60000E+01, 0.80000E+01, 0.10000E+02, | |
745 | 0.15000E+02, 0.20000E+02 }; | |
746 | ||
747 | return Interpolate(energyMeV,en,mu,kN); | |
748 | ||
749 | } | |
750 | ||
46d29e70 | 751 | //_____________________________________________________________________________ |
752 | Double_t AliTRDsim::Interpolate(Double_t energyMeV | |
753 | , Double_t *en, Double_t *mu, Int_t n) | |
754 | { | |
755 | // | |
756 | // Interpolates the photon absorbtion cross section | |
757 | // for a given energy <energyMeV>. | |
758 | // | |
759 | ||
760 | Double_t de = 0; | |
761 | Int_t index = 0; | |
762 | Int_t istat = Locate(en,n,energyMeV,index,de); | |
763 | if (istat == 0) { | |
764 | return (mu[index] - de * (mu[index] - mu[index+1]) | |
765 | / (en[index+1] - en[index] )); | |
766 | } | |
767 | else { | |
768 | return 0.0; | |
769 | } | |
770 | ||
771 | } | |
772 | ||
773 | //_____________________________________________________________________________ | |
774 | Int_t AliTRDsim::Locate(Double_t *xv, Int_t n, Double_t xval | |
775 | , Int_t &kl, Double_t &dx) | |
776 | { | |
777 | // | |
778 | // Locates a point (xval) in a 1-dim grid (xv(n)) | |
779 | // | |
780 | ||
781 | if (xval >= xv[n-1]) return 1; | |
782 | if (xval < xv[0]) return -1; | |
783 | ||
784 | Int_t km; | |
785 | Int_t kh = n - 1; | |
786 | ||
787 | kl = 0; | |
788 | while (kh - kl > 1) { | |
789 | if (xval < xv[km = (kl+kh)/2]) kh = km; | |
790 | else kl = km; | |
791 | } | |
792 | if (xval < xv[kl] || xval > xv[kl+1] || kl >= n-1) { | |
793 | printf("Locate failed xv[%d] %f xval %f xv[%d] %f!!!\n" | |
794 | ,kl,xv[kl],xval,kl+1,xv[kl+1]); | |
795 | exit(1); | |
796 | } | |
797 | ||
798 | dx = xval - xv[kl]; | |
799 | ||
800 | return 0; | |
801 | ||
802 | } | |
0142cb22 | 803 | |
804 | //_____________________________________________________________________________ | |
805 | Int_t AliTRDsim::SelectNFoils(Float_t p) | |
806 | { | |
807 | // | |
808 | // Selects the number of foils corresponding to the momentum | |
809 | // | |
810 | ||
811 | Int_t foils = fNFoils[fNFoilsDim-1]; | |
812 | ||
813 | for (Int_t iFoil = 0; iFoil < fNFoilsDim; iFoil++) { | |
814 | if (p < fNFoilsUp[iFoil]) { | |
815 | foils = fNFoils[iFoil]; | |
816 | break; | |
817 | } | |
818 | } | |
819 | ||
820 | return foils; | |
821 | ||
822 | } |