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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 | 42 | ClassImp(AliTRDsim) |
43 | ||
44 | //_____________________________________________________________________________ | |
45 | AliTRDsim::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 | //_____________________________________________________________________________ | |
61 | AliTRDsim::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 | 98 | AliTRDsim::AliTRDsim(const AliTRDsim &s):TObject(s) |
46d29e70 | 99 | { |
100 | // | |
101 | // AliTRDsim copy constructor | |
102 | // | |
103 | ||
104 | ((AliTRDsim &) s).Copy(*this); | |
105 | ||
106 | } | |
107 | ||
108 | //_____________________________________________________________________________ | |
109 | AliTRDsim::~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 | //_____________________________________________________________________________ | |
123 | AliTRDsim &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 | //_____________________________________________________________________________ | |
135 | void 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 | //_____________________________________________________________________________ | |
181 | void 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 | //_____________________________________________________________________________ | |
241 | Int_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 | 282 | Int_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 | //_____________________________________________________________________________ | |
356 | void 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 | //_____________________________________________________________________________ | |
373 | Double_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 | //_____________________________________________________________________________ | |
392 | Double_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 | //_____________________________________________________________________________ | |
431 | Double_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 | //_____________________________________________________________________________ | |
470 | Double_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 | //_____________________________________________________________________________ | |
517 | Double_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 | //_____________________________________________________________________________ | |
556 | Double_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 | //_____________________________________________________________________________ | |
595 | Double_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 | //_____________________________________________________________________________ | |
634 | Double_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 | //_____________________________________________________________________________ | |
673 | Double_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 | //_____________________________________________________________________________ |
712 | Double_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 | //_____________________________________________________________________________ |
756 | Double_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 | //_____________________________________________________________________________ | |
778 | Int_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 | //_____________________________________________________________________________ | |
809 | Int_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 | } |