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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 | ||
16 | /* | |
17 | $Log$ | |
abaf1f1d | 18 | Revision 1.10 2001/05/31 16:53:26 alibrary |
19 | Correction to the destructor | |
20 | ||
5567246e | 21 | Revision 1.9 2001/05/21 16:45:47 hristov |
22 | Last minute changes (C.Blume) | |
23 | ||
db30bf0f | 24 | Revision 1.8 2001/01/26 19:56:57 hristov |
25 | Major upgrade of AliRoot code | |
26 | ||
2ab0c725 | 27 | Revision 1.7 2000/12/20 13:00:45 cblume |
28 | Modifications for the HP-compiler | |
29 | ||
d1b06c24 | 30 | Revision 1.6 2000/12/12 10:20:10 cblume |
31 | Initialize fSepctrum = 0 in ctors | |
32 | ||
fa5e892a | 33 | Revision 1.5 2000/10/15 23:40:01 cblume |
34 | Remove AliTRDconst | |
35 | ||
0e9c2ad5 | 36 | Revision 1.4 2000/10/06 16:49:46 cblume |
37 | Made Getters const | |
38 | ||
46d29e70 | 39 | Revision 1.3.2.1 2000/09/18 13:45:30 cblume |
40 | New class AliTRDsim that simulates TR photons | |
41 | ||
42 | Revision 1.2 1999/09/29 09:24:35 fca | |
43 | Introduction of the Copyright and cvs Log | |
44 | ||
45 | */ | |
46 | ||
47 | /////////////////////////////////////////////////////////////////////////////// | |
48 | // // | |
49 | // TRD simulation - multimodule (regular rad.) // | |
50 | // after: M. CASTELLANO et al., COMP. PHYS. COMM. 51 (1988) 431 // | |
51 | // + COMP. PHYS. COMM. 61 (1990) 395 // | |
52 | // // | |
53 | // 17.07.1998 - A.Andronic // | |
54 | // 08.12.1998 - simplified version // | |
55 | // 11.07.2000 - Adapted code to aliroot environment (C.Blume) // | |
56 | // // | |
57 | /////////////////////////////////////////////////////////////////////////////// | |
58 | ||
59 | #include <stdlib.h> | |
60 | ||
0e9c2ad5 | 61 | #include <TH1.h> |
62 | #include <TRandom.h> | |
63 | #include <TMath.h> | |
64 | #include <TParticle.h> | |
46d29e70 | 65 | |
46d29e70 | 66 | #include "AliModule.h" |
67 | ||
0e9c2ad5 | 68 | #include "AliTRDsim.h" |
69 | ||
46d29e70 | 70 | ClassImp(AliTRDsim) |
71 | ||
72 | //_____________________________________________________________________________ | |
73 | AliTRDsim::AliTRDsim():TObject() | |
74 | { | |
75 | // | |
76 | // AliTRDsim default constructor | |
77 | // | |
78 | ||
fa5e892a | 79 | fSpectrum = 0; |
d1b06c24 | 80 | fSigma = 0; |
fa5e892a | 81 | |
46d29e70 | 82 | Init(); |
83 | ||
84 | } | |
85 | ||
86 | //_____________________________________________________________________________ | |
87 | AliTRDsim::AliTRDsim(AliModule *mod, Int_t foil, Int_t gap) | |
88 | { | |
89 | // | |
90 | // AliTRDsim constructor. Takes the material properties of the radiator | |
91 | // foils and the gas in the gaps from AliModule <mod>. | |
92 | // The default number of foils is 100 with a thickness of 20 mu. The | |
93 | // thickness of the gaps is 500 mu. | |
94 | // | |
95 | ||
96 | Float_t aFoil, zFoil, rhoFoil; | |
97 | Float_t aGap, zGap, rhoGap; | |
98 | Float_t rad, abs; | |
99 | Char_t name[21]; | |
100 | ||
fa5e892a | 101 | fSpectrum = 0; |
d1b06c24 | 102 | fSigma = 0; |
fa5e892a | 103 | |
46d29e70 | 104 | Init(); |
105 | ||
106 | mod->AliGetMaterial(foil,name,aFoil,zFoil,rhoFoil,rad,abs); | |
107 | mod->AliGetMaterial(gap ,name,aGap ,zGap ,rhoGap ,rad,abs); | |
108 | ||
109 | fFoilDens = rhoFoil; | |
110 | fFoilA = aFoil; | |
111 | fFoilZ = zFoil; | |
112 | fFoilOmega = Omega(fFoilDens,fFoilZ,fFoilA); | |
113 | ||
114 | fGapDens = rhoGap; | |
115 | fGapA = aGap; | |
116 | fGapZ = zGap; | |
117 | fGapOmega = Omega(fGapDens ,fGapZ ,fGapA ); | |
118 | ||
119 | } | |
120 | ||
121 | //_____________________________________________________________________________ | |
122 | AliTRDsim::AliTRDsim(const AliTRDsim &s) | |
123 | { | |
124 | // | |
125 | // AliTRDsim copy constructor | |
126 | // | |
127 | ||
128 | ((AliTRDsim &) s).Copy(*this); | |
129 | ||
130 | } | |
131 | ||
132 | //_____________________________________________________________________________ | |
133 | AliTRDsim::~AliTRDsim() | |
134 | { | |
135 | // | |
136 | // AliTRDsim destructor | |
137 | // | |
138 | ||
5567246e | 139 | // if (fSpectrum) delete fSpectrum; |
140 | if (fSigma) delete [] fSigma; | |
46d29e70 | 141 | |
142 | } | |
143 | ||
144 | //_____________________________________________________________________________ | |
145 | AliTRDsim &AliTRDsim::operator=(const AliTRDsim &s) | |
146 | { | |
147 | // | |
148 | // Assignment operator | |
149 | // | |
150 | ||
151 | if (this != &s) ((AliTRDsim &) s).Copy(*this); | |
152 | return *this; | |
153 | ||
154 | } | |
155 | ||
156 | //_____________________________________________________________________________ | |
157 | void AliTRDsim::Copy(TObject &s) | |
158 | { | |
159 | // | |
160 | // Copy function | |
161 | // | |
162 | ||
163 | ((AliTRDsim &) s).fNFoils = fNFoils; | |
164 | ((AliTRDsim &) s).fFoilThick = fFoilThick; | |
165 | ((AliTRDsim &) s).fFoilDens = fFoilDens; | |
166 | ((AliTRDsim &) s).fFoilOmega = fFoilOmega; | |
167 | ((AliTRDsim &) s).fFoilZ = fFoilZ; | |
168 | ((AliTRDsim &) s).fFoilA = fFoilA; | |
169 | ((AliTRDsim &) s).fGapThick = fGapThick; | |
170 | ((AliTRDsim &) s).fGapDens = fGapDens; | |
171 | ((AliTRDsim &) s).fGapOmega = fGapOmega; | |
172 | ((AliTRDsim &) s).fGapZ = fGapZ; | |
173 | ((AliTRDsim &) s).fGapA = fGapA; | |
174 | ((AliTRDsim &) s).fTemp = fTemp; | |
175 | ((AliTRDsim &) s).fSpNBins = fSpNBins; | |
176 | ((AliTRDsim &) s).fSpRange = fSpRange; | |
177 | ((AliTRDsim &) s).fSpBinWidth = fSpBinWidth; | |
178 | ((AliTRDsim &) s).fSpLower = fSpLower; | |
179 | ((AliTRDsim &) s).fSpUpper = fSpUpper; | |
180 | ||
5567246e | 181 | if (((AliTRDsim &) s).fSigma) delete [] ((AliTRDsim &) s).fSigma; |
46d29e70 | 182 | ((AliTRDsim &) s).fSigma = new Double_t[fSpNBins]; |
183 | for (Int_t iBin = 0; iBin < fSpNBins; iBin++) { | |
184 | ((AliTRDsim &) s).fSigma[iBin] = fSigma[iBin]; | |
185 | } | |
186 | ||
187 | fSpectrum->Copy(*((AliTRDsim &) s).fSpectrum); | |
188 | ||
189 | } | |
190 | ||
191 | //_____________________________________________________________________________ | |
192 | void AliTRDsim::Init() | |
193 | { | |
194 | // | |
195 | // Initialization | |
db30bf0f | 196 | // The default radiator are 100 prolypropilene foils of 13 mu thickness |
197 | // with gaps of 60 mu filled with CO2. | |
46d29e70 | 198 | // |
199 | ||
200 | fNFoils = 100; | |
201 | ||
db30bf0f | 202 | fFoilThick = 0.0013; |
46d29e70 | 203 | fFoilDens = 0.92; |
204 | fFoilZ = 5.28571; | |
205 | fFoilA = 10.4286; | |
206 | fFoilOmega = Omega(fFoilDens,fFoilZ,fFoilA); | |
207 | ||
db30bf0f | 208 | fGapThick = 0.0060; |
46d29e70 | 209 | fGapDens = 0.001977; |
210 | fGapZ = 7.45455; | |
211 | fGapA = 14.9091; | |
212 | fGapOmega = Omega(fGapDens ,fGapZ ,fGapA ); | |
213 | ||
214 | fTemp = 293.16; | |
215 | ||
216 | fSpNBins = 200; | |
217 | fSpRange = 100; | |
218 | fSpBinWidth = fSpRange / fSpNBins; | |
219 | fSpLower = 1.0 - 0.5 * fSpBinWidth; | |
220 | fSpUpper = fSpLower + fSpRange; | |
221 | ||
222 | if (fSpectrum) delete fSpectrum; | |
223 | fSpectrum = new TH1D("TRspectrum","TR spectrum",fSpNBins,fSpLower,fSpUpper); | |
abaf1f1d | 224 | fSpectrum->SetDirectory(0); |
46d29e70 | 225 | |
226 | // Set the sigma values | |
227 | SetSigma(); | |
228 | ||
229 | } | |
230 | ||
231 | //_____________________________________________________________________________ | |
232 | Int_t AliTRDsim::CreatePhotons(Int_t pdg, Float_t p | |
233 | , Int_t &nPhoton, Float_t *ePhoton) | |
234 | { | |
235 | // | |
236 | // Create TRD photons for a charged particle of type <pdg> with the total | |
237 | // momentum <p>. | |
238 | // Number of produced TR photons: <nPhoton> | |
239 | // Energies of the produced TR photons: <ePhoton> | |
240 | // | |
241 | ||
242 | // PDG codes | |
243 | const Int_t kPdgEle = 11; | |
244 | const Int_t kPdgMuon = 13; | |
245 | const Int_t kPdgPion = 211; | |
246 | const Int_t kPdgKaon = 321; | |
247 | ||
248 | Float_t mass = 0; | |
249 | switch (TMath::Abs(pdg)) { | |
250 | case kPdgEle: | |
251 | mass = 5.11e-4; | |
252 | break; | |
253 | case kPdgMuon: | |
254 | mass = 0.10566; | |
255 | break; | |
256 | case kPdgPion: | |
257 | mass = 0.13957; | |
258 | break; | |
259 | case kPdgKaon: | |
260 | mass = 0.4937; | |
261 | break; | |
262 | default: | |
263 | return 0; | |
264 | break; | |
265 | }; | |
266 | ||
267 | // Calculate gamma | |
268 | Double_t gamma = TMath::Sqrt(p*p + mass*mass) / mass; | |
269 | ||
270 | // Calculate the TR photons | |
271 | return TrPhotons(gamma, nPhoton, ePhoton); | |
272 | ||
273 | } | |
274 | ||
275 | //_____________________________________________________________________________ | |
276 | Int_t AliTRDsim::TrPhotons(Double_t gamma, Int_t &nPhoton, Float_t *ePhoton) | |
277 | { | |
278 | // | |
279 | // Produces TR photons. | |
280 | // | |
281 | ||
282 | const Double_t kAlpha = 0.0072973; | |
283 | const Int_t kSumMax = 10; | |
284 | ||
285 | Double_t kappa = fGapThick / fFoilThick; | |
286 | ||
287 | fSpectrum->Reset(); | |
288 | ||
289 | // The TR spectrum | |
290 | Double_t stemp = 0; | |
291 | for (Int_t iBin = 0; iBin < fSpNBins; iBin++) { | |
292 | ||
293 | // keV -> eV | |
294 | Double_t energyeV = (fSpBinWidth * iBin + 1.0) * 1e3; | |
295 | ||
296 | Double_t csFoil = fFoilOmega / energyeV; | |
297 | Double_t csGap = fGapOmega / energyeV; | |
298 | ||
299 | Double_t rho1 = energyeV * fFoilThick * 1e4 * 2.5 | |
300 | * (1.0 / (gamma*gamma) + csFoil*csFoil); | |
301 | Double_t rho2 = energyeV * fFoilThick * 1e4 * 2.5 | |
302 | * (1.0 / (gamma*gamma) + csGap *csGap); | |
303 | ||
304 | // Calculate the sum | |
305 | Double_t sum = 0; | |
306 | for (Int_t iSum = 0; iSum < kSumMax; iSum++) { | |
307 | Double_t tetan = (TMath::Pi() * 2.0 * (iSum+1) - (rho1 + kappa * rho2)) | |
308 | / (kappa + 1.0); | |
309 | if (tetan < 0.0) tetan = 0.0; | |
310 | Double_t aux = 1.0 / (rho1 + tetan) - 1.0 / (rho2 + tetan); | |
311 | sum += tetan * (aux*aux) * (1.0 - TMath::Cos(rho1 + tetan)); | |
312 | } | |
313 | ||
314 | // Absorbtion | |
315 | Double_t conv = 1.0 - TMath::Exp(-fNFoils * fSigma[iBin]); | |
316 | ||
317 | // eV -> keV | |
318 | Float_t energykeV = energyeV * 0.001; | |
319 | ||
320 | // dN / domega | |
321 | Double_t wn = kAlpha * 4.0 / (fSigma[iBin] * (kappa + 1.0)) | |
322 | * conv * sum / energykeV; | |
323 | fSpectrum->SetBinContent(iBin,wn); | |
324 | ||
325 | stemp += wn; | |
326 | ||
327 | } | |
328 | ||
329 | // <nTR> (binsize corr.) | |
330 | Float_t ntr = stemp * fSpBinWidth; | |
331 | // Number of TR photons from Poisson distribution with mean <ntr> | |
332 | nPhoton = gRandom->Poisson(ntr); | |
333 | // Energy of the TR photons | |
334 | for (Int_t iPhoton = 0; iPhoton < nPhoton; iPhoton++) { | |
335 | ePhoton[iPhoton] = fSpectrum->GetRandom(); | |
336 | } | |
337 | ||
338 | return 1; | |
339 | ||
340 | } | |
341 | ||
342 | //_____________________________________________________________________________ | |
343 | void AliTRDsim::SetSigma() | |
344 | { | |
345 | // | |
346 | // Sets the absorbtion crosssection for the energies of the TR spectrum | |
347 | // | |
348 | ||
5567246e | 349 | if (fSigma) delete [] fSigma; |
46d29e70 | 350 | fSigma = new Double_t[fSpNBins]; |
351 | for (Int_t iBin = 0; iBin < fSpNBins; iBin++) { | |
352 | Double_t energykeV = iBin * fSpBinWidth + 1.0; | |
353 | fSigma[iBin] = Sigma(energykeV); | |
354 | //printf("SetSigma(): iBin = %d fSigma %g\n",iBin,fSigma[iBin]); | |
355 | } | |
356 | ||
357 | } | |
358 | ||
359 | //_____________________________________________________________________________ | |
360 | Double_t AliTRDsim::Sigma(Double_t energykeV) | |
361 | { | |
362 | // | |
363 | // Calculates the absorbtion crosssection for a one-foil-one-gap-radiator | |
364 | // | |
365 | ||
366 | // Gas at 0 C | |
367 | const Double_t kTemp0 = 273.16; | |
368 | ||
369 | // keV -> MeV | |
370 | Double_t energyMeV = energykeV * 0.001; | |
371 | if (energyMeV >= 0.001) { | |
372 | return(GetMuPo(energyMeV) * fFoilDens * fFoilThick + | |
373 | GetMuCO(energyMeV) * fGapDens * fGapThick * fTemp/kTemp0); | |
374 | } | |
375 | else { | |
376 | return 1e6; | |
377 | } | |
378 | ||
379 | } | |
380 | ||
381 | //_____________________________________________________________________________ | |
382 | Double_t AliTRDsim::GetMuPo(Double_t energyMeV) | |
383 | { | |
384 | // | |
385 | // Returns the photon absorbtion cross section for polypropylene | |
386 | // | |
387 | ||
388 | const Int_t kN = 36; | |
389 | ||
390 | Double_t mu[kN] = { 1.894E+03, 5.999E+02, 2.593E+02 | |
391 | , 7.743E+01, 3.242E+01, 1.643E+01 | |
392 | , 9.432E+00, 3.975E+00, 2.088E+00 | |
393 | , 7.452E-01, 4.315E-01, 2.706E-01 | |
394 | , 2.275E-01, 2.084E-01, 1.970E-01 | |
395 | , 1.823E-01, 1.719E-01, 1.534E-01 | |
396 | , 1.402E-01, 1.217E-01, 1.089E-01 | |
397 | , 9.947E-02, 9.198E-02, 8.078E-02 | |
398 | , 7.262E-02, 6.495E-02, 5.910E-02 | |
399 | , 5.064E-02, 4.045E-02, 3.444E-02 | |
400 | , 3.045E-02, 2.760E-02, 2.383E-02 | |
401 | , 2.145E-02, 1.819E-02, 1.658E-02 }; | |
402 | ||
403 | Double_t en[kN] = { 1.000E-03, 1.500E-03, 2.000E-03 | |
404 | , 3.000E-03, 4.000E-03, 5.000E-03 | |
405 | , 6.000E-03, 8.000E-03, 1.000E-02 | |
406 | , 1.500E-02, 2.000E-02, 3.000E-02 | |
407 | , 4.000E-02, 5.000E-02, 6.000E-02 | |
408 | , 8.000E-02, 1.000E-01, 1.500E-01 | |
409 | , 2.000E-01, 3.000E-01, 4.000E-01 | |
410 | , 5.000E-01, 6.000E-01, 8.000E-01 | |
411 | , 1.000E+00, 1.250E+00, 1.500E+00 | |
412 | , 2.000E+00, 3.000E+00, 4.000E+00 | |
413 | , 5.000E+00, 6.000E+00, 8.000E+00 | |
414 | , 1.000E+01, 1.500E+01, 2.000E+01 }; | |
415 | ||
416 | return Interpolate(energyMeV,en,mu,kN); | |
417 | ||
418 | } | |
419 | ||
420 | //_____________________________________________________________________________ | |
421 | Double_t AliTRDsim::GetMuCO(Double_t energyMeV) | |
422 | { | |
423 | // | |
424 | // Returns the photon absorbtion cross section for CO2 | |
425 | // | |
426 | ||
427 | const Int_t kN = 36; | |
428 | ||
429 | Double_t mu[kN] = { 0.39383E+04, 0.13166E+04, 0.58750E+03 | |
430 | , 0.18240E+03, 0.77996E+02, 0.40024E+02 | |
431 | , 0.23116E+02, 0.96997E+01, 0.49726E+01 | |
432 | , 0.15543E+01, 0.74915E+00, 0.34442E+00 | |
433 | , 0.24440E+00, 0.20589E+00, 0.18632E+00 | |
434 | , 0.16578E+00, 0.15394E+00, 0.13558E+00 | |
435 | , 0.12336E+00, 0.10678E+00, 0.95510E-01 | |
436 | , 0.87165E-01, 0.80587E-01, 0.70769E-01 | |
437 | , 0.63626E-01, 0.56894E-01, 0.51782E-01 | |
438 | , 0.44499E-01, 0.35839E-01, 0.30825E-01 | |
439 | , 0.27555E-01, 0.25269E-01, 0.22311E-01 | |
440 | , 0.20516E-01, 0.18184E-01, 0.17152E-01 }; | |
441 | ||
442 | Double_t en[kN] = { 0.10000E-02, 0.15000E-02, 0.20000E-02 | |
443 | , 0.30000E-02, 0.40000E-02, 0.50000E-02 | |
444 | , 0.60000E-02, 0.80000E-02, 0.10000E-01 | |
445 | , 0.15000E-01, 0.20000E-01, 0.30000E-01 | |
446 | , 0.40000E-01, 0.50000E-01, 0.60000E-01 | |
447 | , 0.80000E-01, 0.10000E+00, 0.15000E+00 | |
448 | , 0.20000E+00, 0.30000E+00, 0.40000E+00 | |
449 | , 0.50000E+00, 0.60000E+00, 0.80000E+00 | |
450 | , 0.10000E+01, 0.12500E+01, 0.15000E+01 | |
451 | , 0.20000E+01, 0.30000E+01, 0.40000E+01 | |
452 | , 0.50000E+01, 0.60000E+01, 0.80000E+01 | |
453 | , 0.10000E+02, 0.15000E+02, 0.20000E+02 }; | |
454 | ||
455 | return Interpolate(energyMeV,en,mu,kN); | |
456 | ||
457 | } | |
458 | ||
459 | //_____________________________________________________________________________ | |
460 | Double_t AliTRDsim::GetMuXe(Double_t energyMeV) | |
461 | { | |
462 | // | |
463 | // Returns the photon absorbtion cross section for xenon | |
464 | // | |
465 | ||
466 | const Int_t kN = 48; | |
467 | ||
468 | Double_t mu[kN] = { 9.413E+03, 8.151E+03, 7.035E+03 | |
469 | , 7.338E+03, 4.085E+03, 2.088E+03 | |
470 | , 7.780E+02, 3.787E+02, 2.408E+02 | |
471 | , 6.941E+02, 6.392E+02, 6.044E+02 | |
472 | , 8.181E+02, 7.579E+02, 6.991E+02 | |
473 | , 8.064E+02, 6.376E+02, 3.032E+02 | |
474 | , 1.690E+02, 5.743E+01, 2.652E+01 | |
475 | , 8.930E+00, 6.129E+00, 3.316E+01 | |
476 | , 2.270E+01, 1.272E+01, 7.825E+00 | |
477 | , 3.633E+00, 2.011E+00, 7.202E-01 | |
478 | , 3.760E-01, 1.797E-01, 1.223E-01 | |
479 | , 9.699E-02, 8.281E-02, 6.696E-02 | |
480 | , 5.785E-02, 5.054E-02, 4.594E-02 | |
481 | , 4.078E-02, 3.681E-02, 3.577E-02 | |
482 | , 3.583E-02, 3.634E-02, 3.797E-02 | |
483 | , 3.987E-02, 4.445E-02, 4.815E-02 }; | |
484 | ||
485 | Double_t en[kN] = { 1.00000E-03, 1.07191E-03, 1.14900E-03 | |
486 | , 1.14900E-03, 1.50000E-03, 2.00000E-03 | |
487 | , 3.00000E-03, 4.00000E-03, 4.78220E-03 | |
488 | , 4.78220E-03, 5.00000E-03, 5.10370E-03 | |
489 | , 5.10370E-03, 5.27536E-03, 5.45280E-03 | |
490 | , 5.45280E-03, 6.00000E-03, 8.00000E-03 | |
491 | , 1.00000E-02, 1.50000E-02, 2.00000E-02 | |
492 | , 3.00000E-02, 3.45614E-02, 3.45614E-02 | |
493 | , 4.00000E-02, 5.00000E-02, 6.00000E-02 | |
494 | , 8.00000E-02, 1.00000E-01, 1.50000E-01 | |
495 | , 2.00000E-01, 3.00000E-01, 4.00000E-01 | |
496 | , 5.00000E-01, 6.00000E-01, 8.00000E-01 | |
497 | , 1.00000E+00, 1.25000E+00, 1.50000E+00 | |
498 | , 2.00000E+00, 3.00000E+00, 4.00000E+00 | |
499 | , 5.00000E+00, 6.00000E+00, 8.00000E+00 | |
500 | , 1.00000E+01, 1.50000E+01, 2.00000E+01 }; | |
501 | ||
502 | return Interpolate(energyMeV,en,mu,kN); | |
503 | ||
504 | } | |
505 | ||
506 | //_____________________________________________________________________________ | |
507 | Double_t AliTRDsim::GetMuBu(Double_t energyMeV) | |
508 | { | |
509 | // | |
510 | // Returns the photon absorbtion cross section for isobutane | |
511 | // | |
512 | ||
513 | const Int_t kN = 36; | |
514 | ||
515 | Double_t mu[kN] = { 0.38846E+03, 0.12291E+03, 0.53225E+02 | |
516 | , 0.16091E+02, 0.69114E+01, 0.36541E+01 | |
517 | , 0.22282E+01, 0.11149E+01, 0.72887E+00 | |
518 | , 0.45053E+00, 0.38167E+00, 0.33920E+00 | |
519 | , 0.32155E+00, 0.30949E+00, 0.29960E+00 | |
520 | , 0.28317E+00, 0.26937E+00, 0.24228E+00 | |
521 | , 0.22190E+00, 0.19289E+00, 0.17288E+00 | |
522 | , 0.15789E+00, 0.14602E+00, 0.12829E+00 | |
523 | , 0.11533E+00, 0.10310E+00, 0.93790E-01 | |
524 | , 0.80117E-01, 0.63330E-01, 0.53229E-01 | |
525 | , 0.46390E-01, 0.41425E-01, 0.34668E-01 | |
526 | , 0.30267E-01, 0.23910E-01, 0.20509E-01 }; | |
527 | ||
528 | Double_t en[kN] = { 0.10000E-02, 0.15000E-02, 0.20000E-02 | |
529 | , 0.30000E-02, 0.40000E-02, 0.50000E-02 | |
530 | , 0.60000E-02, 0.80000E-02, 0.10000E-01 | |
531 | , 0.15000E-01, 0.20000E-01, 0.30000E-01 | |
532 | , 0.40000E-01, 0.50000E-01, 0.60000E-01 | |
533 | , 0.80000E-01, 0.10000E+00, 0.15000E+00 | |
534 | , 0.20000E+00, 0.30000E+00, 0.40000E+00 | |
535 | , 0.50000E+00, 0.60000E+00, 0.80000E+00 | |
536 | , 0.10000E+01, 0.12500E+01, 0.15000E+01 | |
537 | , 0.20000E+01, 0.30000E+01, 0.40000E+01 | |
538 | , 0.50000E+01, 0.60000E+01, 0.80000E+01 | |
539 | , 0.10000E+02, 0.15000E+02, 0.20000E+02 }; | |
540 | ||
541 | return Interpolate(energyMeV,en,mu,kN); | |
542 | ||
543 | } | |
544 | ||
545 | //_____________________________________________________________________________ | |
546 | Double_t AliTRDsim::GetMuMy(Double_t energyMeV) | |
547 | { | |
548 | // | |
549 | // Returns the photon absorbtion cross section for mylar | |
550 | // | |
551 | ||
552 | const Int_t kN = 36; | |
553 | ||
554 | Double_t mu[kN] = { 2.911E+03, 9.536E+02, 4.206E+02 | |
555 | , 1.288E+02, 5.466E+01, 2.792E+01 | |
556 | , 1.608E+01, 6.750E+00, 3.481E+00 | |
557 | , 1.132E+00, 5.798E-01, 3.009E-01 | |
558 | , 2.304E-01, 2.020E-01, 1.868E-01 | |
559 | , 1.695E-01, 1.586E-01, 1.406E-01 | |
560 | , 1.282E-01, 1.111E-01, 9.947E-02 | |
561 | , 9.079E-02, 8.395E-02, 7.372E-02 | |
562 | , 6.628E-02, 5.927E-02, 5.395E-02 | |
563 | , 4.630E-02, 3.715E-02, 3.181E-02 | |
564 | , 2.829E-02, 2.582E-02, 2.257E-02 | |
565 | , 2.057E-02, 1.789E-02, 1.664E-02 }; | |
566 | ||
567 | Double_t en[kN] = { 1.00000E-03, 1.50000E-03, 2.00000E-03 | |
568 | , 3.00000E-03, 4.00000E-03, 5.00000E-03 | |
569 | , 6.00000E-03, 8.00000E-03, 1.00000E-02 | |
570 | , 1.50000E-02, 2.00000E-02, 3.00000E-02 | |
571 | , 4.00000E-02, 5.00000E-02, 6.00000E-02 | |
572 | , 8.00000E-02, 1.00000E-01, 1.50000E-01 | |
573 | , 2.00000E-01, 3.00000E-01, 4.00000E-01 | |
574 | , 5.00000E-01, 6.00000E-01, 8.00000E-01 | |
575 | , 1.00000E+00, 1.25000E+00, 1.50000E+00 | |
576 | , 2.00000E+00, 3.00000E+00, 4.00000E+00 | |
577 | , 5.00000E+00, 6.00000E+00, 8.00000E+00 | |
578 | , 1.00000E+01, 1.50000E+01, 2.00000E+01 }; | |
579 | ||
580 | return Interpolate(energyMeV,en,mu,kN); | |
581 | ||
582 | } | |
583 | ||
584 | //_____________________________________________________________________________ | |
585 | Double_t AliTRDsim::GetMuN2(Double_t energyMeV) | |
586 | { | |
587 | // | |
588 | // Returns the photon absorbtion cross section for nitrogen | |
589 | // | |
590 | ||
591 | const Int_t kN = 36; | |
592 | ||
593 | Double_t mu[kN] = { 3.311E+03, 1.083E+03, 4.769E+02 | |
594 | , 1.456E+02, 6.166E+01, 3.144E+01 | |
595 | , 1.809E+01, 7.562E+00, 3.879E+00 | |
596 | , 1.236E+00, 6.178E-01, 3.066E-01 | |
597 | , 2.288E-01, 1.980E-01, 1.817E-01 | |
598 | , 1.639E-01, 1.529E-01, 1.353E-01 | |
599 | , 1.233E-01, 1.068E-01, 9.557E-02 | |
600 | , 8.719E-02, 8.063E-02, 7.081E-02 | |
601 | , 6.364E-02, 5.693E-02, 5.180E-02 | |
602 | , 4.450E-02, 3.579E-02, 3.073E-02 | |
603 | , 2.742E-02, 2.511E-02, 2.209E-02 | |
604 | , 2.024E-02, 1.782E-02, 1.673E-02 }; | |
605 | ||
606 | Double_t en[kN] = { 1.00000E-03, 1.50000E-03, 2.00000E-03 | |
607 | , 3.00000E-03, 4.00000E-03, 5.00000E-03 | |
608 | , 6.00000E-03, 8.00000E-03, 1.00000E-02 | |
609 | , 1.50000E-02, 2.00000E-02, 3.00000E-02 | |
610 | , 4.00000E-02, 5.00000E-02, 6.00000E-02 | |
611 | , 8.00000E-02, 1.00000E-01, 1.50000E-01 | |
612 | , 2.00000E-01, 3.00000E-01, 4.00000E-01 | |
613 | , 5.00000E-01, 6.00000E-01, 8.00000E-01 | |
614 | , 1.00000E+00, 1.25000E+00, 1.50000E+00 | |
615 | , 2.00000E+00, 3.00000E+00, 4.00000E+00 | |
616 | , 5.00000E+00, 6.00000E+00, 8.00000E+00 | |
617 | , 1.00000E+01, 1.50000E+01, 2.00000E+01 }; | |
618 | ||
619 | return Interpolate(energyMeV,en,mu,kN); | |
620 | ||
621 | } | |
622 | ||
623 | //_____________________________________________________________________________ | |
624 | Double_t AliTRDsim::GetMuO2(Double_t energyMeV) | |
625 | { | |
626 | // | |
627 | // Returns the photon absorbtion cross section for oxygen | |
628 | // | |
629 | ||
630 | const Int_t kN = 36; | |
631 | ||
632 | Double_t mu[kN] = { 4.590E+03, 1.549E+03, 6.949E+02 | |
633 | , 2.171E+02, 9.315E+01, 4.790E+01 | |
634 | , 2.770E+01, 1.163E+01, 5.952E+00 | |
635 | , 1.836E+00, 8.651E-01, 3.779E-01 | |
636 | , 2.585E-01, 2.132E-01, 1.907E-01 | |
637 | , 1.678E-01, 1.551E-01, 1.361E-01 | |
638 | , 1.237E-01, 1.070E-01, 9.566E-02 | |
639 | , 8.729E-02, 8.070E-02, 7.087E-02 | |
640 | , 6.372E-02, 5.697E-02, 5.185E-02 | |
641 | , 4.459E-02, 3.597E-02, 3.100E-02 | |
642 | , 2.777E-02, 2.552E-02, 2.263E-02 | |
643 | , 2.089E-02, 1.866E-02, 1.770E-02 }; | |
644 | ||
645 | Double_t en[kN] = { 1.00000E-03, 1.50000E-03, 2.00000E-03 | |
646 | , 3.00000E-03, 4.00000E-03, 5.00000E-03 | |
647 | , 6.00000E-03, 8.00000E-03, 1.00000E-02 | |
648 | , 1.50000E-02, 2.00000E-02, 3.00000E-02 | |
649 | , 4.00000E-02, 5.00000E-02, 6.00000E-02 | |
650 | , 8.00000E-02, 1.00000E-01, 1.50000E-01 | |
651 | , 2.00000E-01, 3.00000E-01, 4.00000E-01 | |
652 | , 5.00000E-01, 6.00000E-01, 8.00000E-01 | |
653 | , 1.00000E+00, 1.25000E+00, 1.50000E+00 | |
654 | , 2.00000E+00, 3.00000E+00, 4.00000E+00 | |
655 | , 5.00000E+00, 6.00000E+00, 8.00000E+00 | |
656 | , 1.00000E+01, 1.50000E+01, 2.00000E+01 }; | |
657 | ||
658 | return Interpolate(energyMeV,en,mu,kN); | |
659 | ||
660 | } | |
661 | ||
662 | //_____________________________________________________________________________ | |
663 | Double_t AliTRDsim::GetMuHe(Double_t energyMeV) | |
664 | { | |
665 | // | |
666 | // Returns the photon absorbtion cross section for helium | |
667 | // | |
668 | ||
669 | const Int_t kN = 36; | |
670 | ||
671 | Double_t mu[kN] = { 6.084E+01, 1.676E+01, 6.863E+00 | |
672 | , 2.007E+00, 9.329E-01, 5.766E-01 | |
673 | , 4.195E-01, 2.933E-01, 2.476E-01 | |
674 | , 2.092E-01, 1.960E-01, 1.838E-01 | |
675 | , 1.763E-01, 1.703E-01, 1.651E-01 | |
676 | , 1.562E-01, 1.486E-01, 1.336E-01 | |
677 | , 1.224E-01, 1.064E-01, 9.535E-02 | |
678 | , 8.707E-02, 8.054E-02, 7.076E-02 | |
679 | , 6.362E-02, 5.688E-02, 5.173E-02 | |
680 | , 4.422E-02, 3.503E-02, 2.949E-02 | |
681 | , 2.577E-02, 2.307E-02, 1.940E-02 | |
682 | , 1.703E-02, 1.363E-02, 1.183E-02 }; | |
683 | ||
684 | Double_t en[kN] = { 1.00000E-03, 1.50000E-03, 2.00000E-03 | |
685 | , 3.00000E-03, 4.00000E-03, 5.00000E-03 | |
686 | , 6.00000E-03, 8.00000E-03, 1.00000E-02 | |
687 | , 1.50000E-02, 2.00000E-02, 3.00000E-02 | |
688 | , 4.00000E-02, 5.00000E-02, 6.00000E-02 | |
689 | , 8.00000E-02, 1.00000E-01, 1.50000E-01 | |
690 | , 2.00000E-01, 3.00000E-01, 4.00000E-01 | |
691 | , 5.00000E-01, 6.00000E-01, 8.00000E-01 | |
692 | , 1.00000E+00, 1.25000E+00, 1.50000E+00 | |
693 | , 2.00000E+00, 3.00000E+00, 4.00000E+00 | |
694 | , 5.00000E+00, 6.00000E+00, 8.00000E+00 | |
695 | , 1.00000E+01, 1.50000E+01, 2.00000E+01 }; | |
696 | ||
697 | return Interpolate(energyMeV,en,mu,kN); | |
698 | ||
699 | } | |
700 | ||
701 | //_____________________________________________________________________________ | |
702 | Double_t AliTRDsim::Interpolate(Double_t energyMeV | |
703 | , Double_t *en, Double_t *mu, Int_t n) | |
704 | { | |
705 | // | |
706 | // Interpolates the photon absorbtion cross section | |
707 | // for a given energy <energyMeV>. | |
708 | // | |
709 | ||
710 | Double_t de = 0; | |
711 | Int_t index = 0; | |
712 | Int_t istat = Locate(en,n,energyMeV,index,de); | |
713 | if (istat == 0) { | |
714 | return (mu[index] - de * (mu[index] - mu[index+1]) | |
715 | / (en[index+1] - en[index] )); | |
716 | } | |
717 | else { | |
718 | return 0.0; | |
719 | } | |
720 | ||
721 | } | |
722 | ||
723 | //_____________________________________________________________________________ | |
724 | Int_t AliTRDsim::Locate(Double_t *xv, Int_t n, Double_t xval | |
725 | , Int_t &kl, Double_t &dx) | |
726 | { | |
727 | // | |
728 | // Locates a point (xval) in a 1-dim grid (xv(n)) | |
729 | // | |
730 | ||
731 | if (xval >= xv[n-1]) return 1; | |
732 | if (xval < xv[0]) return -1; | |
733 | ||
734 | Int_t km; | |
735 | Int_t kh = n - 1; | |
736 | ||
737 | kl = 0; | |
738 | while (kh - kl > 1) { | |
739 | if (xval < xv[km = (kl+kh)/2]) kh = km; | |
740 | else kl = km; | |
741 | } | |
742 | if (xval < xv[kl] || xval > xv[kl+1] || kl >= n-1) { | |
743 | printf("Locate failed xv[%d] %f xval %f xv[%d] %f!!!\n" | |
744 | ,kl,xv[kl],xval,kl+1,xv[kl+1]); | |
745 | exit(1); | |
746 | } | |
747 | ||
748 | dx = xval - xv[kl]; | |
749 | ||
750 | return 0; | |
751 | ||
752 | } |