2 /**************************************************************************
3 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
5 * Author: The ALICE Off-line Project. *
6 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
19 ////////////////////////////////////////////////////////////////////////////
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 //
25 // 17.07.1998 - A.Andronic //
26 // 08.12.1998 - simplified version //
27 // 11.07.2000 - Adapted code to aliroot environment (C.Blume) //
28 // 04.06.2004 - Momentum dependent parameters implemented (CBL) //
30 ////////////////////////////////////////////////////////////////////////////
37 #include <TParticle.h>
38 #include <TVirtualMC.h>
39 #include <TVirtualMCStack.h>
41 #include "AliModule.h"
45 #include "AliTRDsimTR.h"
49 //_____________________________________________________________________________
50 AliTRDsimTR::AliTRDsimTR()
75 // AliTRDsimTR default constructor
82 //_____________________________________________________________________________
83 AliTRDsimTR::AliTRDsimTR(AliModule *mod, Int_t foil, Int_t gap)
108 // AliTRDsimTR constructor. Takes the material properties of the radiator
109 // foils and the gas in the gaps from AliModule <mod>.
110 // The default number of foils is 100 with a thickness of 20 mu. The
111 // thickness of the gaps is 500 mu.
129 mod->AliGetMaterial(foil,name,aFoil,zFoil,rhoFoil,rad,abs);
130 mod->AliGetMaterial(gap ,name,aGap ,zGap ,rhoGap ,rad,abs);
135 fFoilOmega = Omega(fFoilDens,fFoilZ,fFoilA);
140 fGapOmega = Omega(fGapDens ,fGapZ ,fGapA );
144 //_____________________________________________________________________________
145 AliTRDsimTR::AliTRDsimTR(const AliTRDsimTR &s)
147 ,fNFoilsDim(s.fNFoilsDim)
150 ,fFoilThick(s.fFoilThick)
151 ,fGapThick(s.fGapThick)
152 ,fFoilDens(s.fFoilDens)
153 ,fGapDens(s.fGapDens)
154 ,fFoilOmega(s.fFoilOmega)
155 ,fGapOmega(s.fGapOmega)
161 ,fSpNBins(s.fSpNBins)
162 ,fSpRange(s.fSpRange)
163 ,fSpBinWidth(s.fSpBinWidth)
164 ,fSpLower(s.fSpLower)
165 ,fSpUpper(s.fSpUpper)
170 // AliTRDsimTR copy constructor
173 if (((AliTRDsimTR &) s).fNFoils) {
174 delete [] ((AliTRDsimTR &) s).fNFoils;
176 ((AliTRDsimTR &) s).fNFoils = new Int_t[fNFoilsDim];
177 for (Int_t iFoil = 0; iFoil < fNFoilsDim; iFoil++) {
178 ((AliTRDsimTR &) s).fNFoils[iFoil] = fNFoils[iFoil];
181 if (((AliTRDsimTR &) s).fNFoilsUp) {
182 delete [] ((AliTRDsimTR &) s).fNFoilsUp;
184 ((AliTRDsimTR &) s).fNFoilsUp = new Double_t[fNFoilsDim];
185 for (Int_t iFoil = 0; iFoil < fNFoilsDim; iFoil++) {
186 ((AliTRDsimTR &) s).fNFoilsUp[iFoil] = fNFoilsUp[iFoil];
189 if (((AliTRDsimTR &) s).fSigma) {
190 delete [] ((AliTRDsimTR &) s).fSigma;
192 ((AliTRDsimTR &) s).fSigma = new Double_t[fSpNBins];
193 for (Int_t iBin = 0; iBin < fSpNBins; iBin++) {
194 ((AliTRDsimTR &) s).fSigma[iBin] = fSigma[iBin];
197 fSpectrum->Copy(*((AliTRDsimTR &) s).fSpectrum);
201 //_____________________________________________________________________________
202 AliTRDsimTR::~AliTRDsimTR()
205 // AliTRDsimTR destructor
230 //_____________________________________________________________________________
231 AliTRDsimTR &AliTRDsimTR::operator=(const AliTRDsimTR &s)
234 // Assignment operator
237 if (this != &s) ((AliTRDsimTR &) s).Copy(*this);
243 //_____________________________________________________________________________
244 void AliTRDsimTR::Copy(TObject &s) const
250 ((AliTRDsimTR &) s).fFoilThick = fFoilThick;
251 ((AliTRDsimTR &) s).fFoilDens = fFoilDens;
252 ((AliTRDsimTR &) s).fFoilOmega = fFoilOmega;
253 ((AliTRDsimTR &) s).fFoilZ = fFoilZ;
254 ((AliTRDsimTR &) s).fFoilA = fFoilA;
255 ((AliTRDsimTR &) s).fGapThick = fGapThick;
256 ((AliTRDsimTR &) s).fGapDens = fGapDens;
257 ((AliTRDsimTR &) s).fGapOmega = fGapOmega;
258 ((AliTRDsimTR &) s).fGapZ = fGapZ;
259 ((AliTRDsimTR &) s).fGapA = fGapA;
260 ((AliTRDsimTR &) s).fTemp = fTemp;
261 ((AliTRDsimTR &) s).fSpNBins = fSpNBins;
262 ((AliTRDsimTR &) s).fSpRange = fSpRange;
263 ((AliTRDsimTR &) s).fSpBinWidth = fSpBinWidth;
264 ((AliTRDsimTR &) s).fSpLower = fSpLower;
265 ((AliTRDsimTR &) s).fSpUpper = fSpUpper;
267 if (((AliTRDsimTR &) s).fNFoils) {
268 delete [] ((AliTRDsimTR &) s).fNFoils;
270 ((AliTRDsimTR &) s).fNFoils = new Int_t[fNFoilsDim];
271 for (Int_t iFoil = 0; iFoil < fNFoilsDim; iFoil++) {
272 ((AliTRDsimTR &) s).fNFoils[iFoil] = fNFoils[iFoil];
275 if (((AliTRDsimTR &) s).fNFoilsUp) {
276 delete [] ((AliTRDsimTR &) s).fNFoilsUp;
278 ((AliTRDsimTR &) s).fNFoilsUp = new Double_t[fNFoilsDim];
279 for (Int_t iFoil = 0; iFoil < fNFoilsDim; iFoil++) {
280 ((AliTRDsimTR &) s).fNFoilsUp[iFoil] = fNFoilsUp[iFoil];
283 if (((AliTRDsimTR &) s).fSigma) {
284 delete [] ((AliTRDsimTR &) s).fSigma;
286 ((AliTRDsimTR &) s).fSigma = new Double_t[fSpNBins];
287 for (Int_t iBin = 0; iBin < fSpNBins; iBin++) {
288 ((AliTRDsimTR &) s).fSigma[iBin] = fSigma[iBin];
291 fSpectrum->Copy(*((AliTRDsimTR &) s).fSpectrum);
295 //_____________________________________________________________________________
296 void AliTRDsimTR::Init()
300 // The default radiator are prolypropilene foils of 10 mu thickness
301 // with gaps of 80 mu filled with N2.
309 fNFoils = new Int_t[fNFoilsDim];
321 fNFoilsUp = new Double_t[fNFoilsDim];
328 fNFoilsUp[6] = 10000.0;
334 fFoilOmega = Omega(fFoilDens,fFoilZ,fFoilA);
340 fGapOmega = Omega(fGapDens ,fGapZ ,fGapA );
346 fSpBinWidth = fSpRange / fSpNBins;
347 fSpLower = 1.0 - 0.5 * fSpBinWidth;
348 fSpUpper = fSpLower + fSpRange;
350 if (fSpectrum) delete fSpectrum;
351 fSpectrum = new TH1D("TRspectrum","TR spectrum",fSpNBins,fSpLower,fSpUpper);
352 fSpectrum->SetDirectory(0);
354 // Set the sigma values
359 //_____________________________________________________________________________
360 Int_t AliTRDsimTR::CreatePhotons(Int_t pdg, Float_t p
361 , Int_t &nPhoton, Float_t *ePhoton)
364 // Create TRD photons for a charged particle of type <pdg> with the total
366 // Number of produced TR photons: <nPhoton>
367 // Energies of the produced TR photons: <ePhoton>
371 const Int_t kPdgEle = 11;
372 const Int_t kPdgMuon = 13;
373 const Int_t kPdgPion = 211;
374 const Int_t kPdgKaon = 321;
377 switch (TMath::Abs(pdg)) {
395 // Calculate the TR photons
396 return TrPhotons(p, mass, nPhoton, ePhoton);
400 //_____________________________________________________________________________
401 Int_t AliTRDsimTR::TrPhotons(Float_t p, Float_t mass
402 , Int_t &nPhoton, Float_t *ePhoton)
405 // Produces TR photons using a parametric model for regular radiator. Photons
406 // with energy larger than 15 keV are included in the MC stack and tracked by VMC
410 // p - parent momentum [GeV/c]
411 // mass - parent mass
414 // nPhoton - number of photons which have to be processed by custom code
415 // ePhoton - energy of this photons in keV.
418 const Double_t kAlpha = 0.0072973;
419 const Int_t kSumMax = 30;
421 Double_t tau = fGapThick / fFoilThick;
424 Double_t gamma = TMath::Sqrt(p*p + mass*mass) / mass;
426 // Select the number of foils corresponding to momentum
427 Int_t foils = SelectNFoils(p);
443 for (Int_t iBin = 1; iBin <= fSpNBins; iBin++) {
445 energykeV = fSpectrum->GetBinCenter(iBin);
446 energyeV = energykeV * 1.0e3;
448 sigma = Sigma(energykeV);
450 csi1 = fFoilOmega / energyeV;
451 csi2 = fGapOmega / energyeV;
453 rho1 = 2.5 * energyeV * fFoilThick * 1.0e4
454 * (1.0 / (gamma*gamma) + csi1*csi1);
455 rho2 = 2.5 * energyeV * fFoilThick * 1.0e4
456 * (1.0 / (gamma*gamma) + csi2 *csi2);
460 for (Int_t n = 1; n <= kSumMax; n++) {
461 thetaN = (TMath::Pi() * 2.0 * n - (rho1 + tau * rho2)) / (1.0 + tau);
465 aux = 1.0 / (rho1 + thetaN) - 1.0 / (rho2 + thetaN);
466 sum += thetaN * (aux*aux) * (1.0 - TMath::Cos(rho1 + thetaN));
469 // Equivalent number of foils
470 nEqu = (1.0 - TMath::Exp(-foils * sigma)) / (1.0 - TMath::Exp(-sigma));
473 fSpectrum->SetBinContent(iBin,4.0 * kAlpha * nEqu * sum / (energykeV * (1.0 + tau)));
477 // <nTR> (binsize corr.)
478 Float_t nTr = fSpBinWidth * fSpectrum->Integral();
479 // Number of TR photons from Poisson distribution with mean <nTr>
480 Int_t nPhCand = gRandom->Poisson(nTr);
482 // Link the MC stack and get info about parent electron
483 TVirtualMCStack *stack = gMC->GetStack();
484 Int_t track = stack->GetCurrentTrackNumber();
485 Double_t px, py, pz, ptot;
486 gMC->TrackMomentum(px,py,pz,ptot);
487 ptot = TMath::Sqrt(px*px+py*py+pz*pz);
492 // Current position of electron
496 gMC->TrackPosition(x,y,z);
497 Double_t t = gMC->TrackTime();
499 // Counter for TR analysed in custom code (e < 15keV)
502 for (Int_t iPhoton = 0; iPhoton < nPhCand; iPhoton++) {
504 // Energy of the TR photon
505 Double_t e = fSpectrum->GetRandom();
507 // Put TR photon on particle stack
510 e *= 1.0e-6; // Convert it to GeV
513 stack->PushTrack(1 // Must be 1
514 ,track // Identifier of the parent track, -1 for a primary
515 ,22 // Particle code.
516 ,px*e // 4 momentum (The photon is generated on the same
517 ,py*e // direction as the parent. For irregular radiator one
518 ,pz*e // can calculate also the angle but this is a secondary
521 ,0.0,0.0,0.0 // Polarisation
522 ,kPFeedBackPhoton // Production mechanism (there is no TR in G3 so one
523 // has to make some convention)
524 ,phtrack // On output the number of the track stored
529 // Custom treatment of TR photons
532 ePhoton[nPhoton++] = e;
542 //_____________________________________________________________________________
543 void AliTRDsimTR::SetSigma()
546 // Sets the absorbtion crosssection for the energies of the TR spectrum
552 fSigma = new Double_t[fSpNBins];
554 for (Int_t iBin = 0; iBin < fSpNBins; iBin++) {
555 Double_t energykeV = iBin * fSpBinWidth + 1.0;
556 fSigma[iBin] = Sigma(energykeV);
561 //_____________________________________________________________________________
562 Double_t AliTRDsimTR::Sigma(Double_t energykeV)
565 // Calculates the absorbtion crosssection for a one-foil-one-gap-radiator
569 Double_t energyMeV = energykeV * 0.001;
570 if (energyMeV >= 0.001) {
571 return(GetMuPo(energyMeV) * fFoilDens * fFoilThick +
572 GetMuAi(energyMeV) * fGapDens * fGapThick * GetTemp());
580 //_____________________________________________________________________________
581 Double_t AliTRDsimTR::GetMuPo(Double_t energyMeV)
584 // Returns the photon absorbtion cross section for polypropylene
589 Double_t mu[kN] = { 1.894E+03, 5.999E+02, 2.593E+02
590 , 7.743E+01, 3.242E+01, 1.643E+01
591 , 9.432E+00, 3.975E+00, 2.088E+00
592 , 7.452E-01, 4.315E-01, 2.706E-01
593 , 2.275E-01, 2.084E-01, 1.970E-01
594 , 1.823E-01, 1.719E-01, 1.534E-01
595 , 1.402E-01, 1.217E-01, 1.089E-01
596 , 9.947E-02, 9.198E-02, 8.078E-02
597 , 7.262E-02, 6.495E-02, 5.910E-02
598 , 5.064E-02, 4.045E-02, 3.444E-02
599 , 3.045E-02, 2.760E-02, 2.383E-02
600 , 2.145E-02, 1.819E-02, 1.658E-02 };
602 Double_t en[kN] = { 1.000E-03, 1.500E-03, 2.000E-03
603 , 3.000E-03, 4.000E-03, 5.000E-03
604 , 6.000E-03, 8.000E-03, 1.000E-02
605 , 1.500E-02, 2.000E-02, 3.000E-02
606 , 4.000E-02, 5.000E-02, 6.000E-02
607 , 8.000E-02, 1.000E-01, 1.500E-01
608 , 2.000E-01, 3.000E-01, 4.000E-01
609 , 5.000E-01, 6.000E-01, 8.000E-01
610 , 1.000E+00, 1.250E+00, 1.500E+00
611 , 2.000E+00, 3.000E+00, 4.000E+00
612 , 5.000E+00, 6.000E+00, 8.000E+00
613 , 1.000E+01, 1.500E+01, 2.000E+01 };
615 return Interpolate(energyMeV,en,mu,kN);
619 //_____________________________________________________________________________
620 Double_t AliTRDsimTR::GetMuCO(Double_t energyMeV)
623 // Returns the photon absorbtion cross section for CO2
628 Double_t mu[kN] = { 0.39383E+04, 0.13166E+04, 0.58750E+03
629 , 0.18240E+03, 0.77996E+02, 0.40024E+02
630 , 0.23116E+02, 0.96997E+01, 0.49726E+01
631 , 0.15543E+01, 0.74915E+00, 0.34442E+00
632 , 0.24440E+00, 0.20589E+00, 0.18632E+00
633 , 0.16578E+00, 0.15394E+00, 0.13558E+00
634 , 0.12336E+00, 0.10678E+00, 0.95510E-01
635 , 0.87165E-01, 0.80587E-01, 0.70769E-01
636 , 0.63626E-01, 0.56894E-01, 0.51782E-01
637 , 0.44499E-01, 0.35839E-01, 0.30825E-01
638 , 0.27555E-01, 0.25269E-01, 0.22311E-01
639 , 0.20516E-01, 0.18184E-01, 0.17152E-01 };
641 Double_t en[kN] = { 0.10000E-02, 0.15000E-02, 0.20000E-02
642 , 0.30000E-02, 0.40000E-02, 0.50000E-02
643 , 0.60000E-02, 0.80000E-02, 0.10000E-01
644 , 0.15000E-01, 0.20000E-01, 0.30000E-01
645 , 0.40000E-01, 0.50000E-01, 0.60000E-01
646 , 0.80000E-01, 0.10000E+00, 0.15000E+00
647 , 0.20000E+00, 0.30000E+00, 0.40000E+00
648 , 0.50000E+00, 0.60000E+00, 0.80000E+00
649 , 0.10000E+01, 0.12500E+01, 0.15000E+01
650 , 0.20000E+01, 0.30000E+01, 0.40000E+01
651 , 0.50000E+01, 0.60000E+01, 0.80000E+01
652 , 0.10000E+02, 0.15000E+02, 0.20000E+02 };
654 return Interpolate(energyMeV,en,mu,kN);
658 //_____________________________________________________________________________
659 Double_t AliTRDsimTR::GetMuXe(Double_t energyMeV)
662 // Returns the photon absorbtion cross section for xenon
667 Double_t mu[kN] = { 9.413E+03, 8.151E+03, 7.035E+03
668 , 7.338E+03, 4.085E+03, 2.088E+03
669 , 7.780E+02, 3.787E+02, 2.408E+02
670 , 6.941E+02, 6.392E+02, 6.044E+02
671 , 8.181E+02, 7.579E+02, 6.991E+02
672 , 8.064E+02, 6.376E+02, 3.032E+02
673 , 1.690E+02, 5.743E+01, 2.652E+01
674 , 8.930E+00, 6.129E+00, 3.316E+01
675 , 2.270E+01, 1.272E+01, 7.825E+00
676 , 3.633E+00, 2.011E+00, 7.202E-01
677 , 3.760E-01, 1.797E-01, 1.223E-01
678 , 9.699E-02, 8.281E-02, 6.696E-02
679 , 5.785E-02, 5.054E-02, 4.594E-02
680 , 4.078E-02, 3.681E-02, 3.577E-02
681 , 3.583E-02, 3.634E-02, 3.797E-02
682 , 3.987E-02, 4.445E-02, 4.815E-02 };
684 Double_t en[kN] = { 1.00000E-03, 1.07191E-03, 1.14900E-03
685 , 1.14900E-03, 1.50000E-03, 2.00000E-03
686 , 3.00000E-03, 4.00000E-03, 4.78220E-03
687 , 4.78220E-03, 5.00000E-03, 5.10370E-03
688 , 5.10370E-03, 5.27536E-03, 5.45280E-03
689 , 5.45280E-03, 6.00000E-03, 8.00000E-03
690 , 1.00000E-02, 1.50000E-02, 2.00000E-02
691 , 3.00000E-02, 3.45614E-02, 3.45614E-02
692 , 4.00000E-02, 5.00000E-02, 6.00000E-02
693 , 8.00000E-02, 1.00000E-01, 1.50000E-01
694 , 2.00000E-01, 3.00000E-01, 4.00000E-01
695 , 5.00000E-01, 6.00000E-01, 8.00000E-01
696 , 1.00000E+00, 1.25000E+00, 1.50000E+00
697 , 2.00000E+00, 3.00000E+00, 4.00000E+00
698 , 5.00000E+00, 6.00000E+00, 8.00000E+00
699 , 1.00000E+01, 1.50000E+01, 2.00000E+01 };
701 return Interpolate(energyMeV,en,mu,kN);
705 //_____________________________________________________________________________
706 Double_t AliTRDsimTR::GetMuBu(Double_t energyMeV)
709 // Returns the photon absorbtion cross section for isobutane
714 Double_t mu[kN] = { 0.38846E+03, 0.12291E+03, 0.53225E+02
715 , 0.16091E+02, 0.69114E+01, 0.36541E+01
716 , 0.22282E+01, 0.11149E+01, 0.72887E+00
717 , 0.45053E+00, 0.38167E+00, 0.33920E+00
718 , 0.32155E+00, 0.30949E+00, 0.29960E+00
719 , 0.28317E+00, 0.26937E+00, 0.24228E+00
720 , 0.22190E+00, 0.19289E+00, 0.17288E+00
721 , 0.15789E+00, 0.14602E+00, 0.12829E+00
722 , 0.11533E+00, 0.10310E+00, 0.93790E-01
723 , 0.80117E-01, 0.63330E-01, 0.53229E-01
724 , 0.46390E-01, 0.41425E-01, 0.34668E-01
725 , 0.30267E-01, 0.23910E-01, 0.20509E-01 };
727 Double_t en[kN] = { 0.10000E-02, 0.15000E-02, 0.20000E-02
728 , 0.30000E-02, 0.40000E-02, 0.50000E-02
729 , 0.60000E-02, 0.80000E-02, 0.10000E-01
730 , 0.15000E-01, 0.20000E-01, 0.30000E-01
731 , 0.40000E-01, 0.50000E-01, 0.60000E-01
732 , 0.80000E-01, 0.10000E+00, 0.15000E+00
733 , 0.20000E+00, 0.30000E+00, 0.40000E+00
734 , 0.50000E+00, 0.60000E+00, 0.80000E+00
735 , 0.10000E+01, 0.12500E+01, 0.15000E+01
736 , 0.20000E+01, 0.30000E+01, 0.40000E+01
737 , 0.50000E+01, 0.60000E+01, 0.80000E+01
738 , 0.10000E+02, 0.15000E+02, 0.20000E+02 };
740 return Interpolate(energyMeV,en,mu,kN);
744 //_____________________________________________________________________________
745 Double_t AliTRDsimTR::GetMuMy(Double_t energyMeV)
748 // Returns the photon absorbtion cross section for mylar
753 Double_t mu[kN] = { 2.911E+03, 9.536E+02, 4.206E+02
754 , 1.288E+02, 5.466E+01, 2.792E+01
755 , 1.608E+01, 6.750E+00, 3.481E+00
756 , 1.132E+00, 5.798E-01, 3.009E-01
757 , 2.304E-01, 2.020E-01, 1.868E-01
758 , 1.695E-01, 1.586E-01, 1.406E-01
759 , 1.282E-01, 1.111E-01, 9.947E-02
760 , 9.079E-02, 8.395E-02, 7.372E-02
761 , 6.628E-02, 5.927E-02, 5.395E-02
762 , 4.630E-02, 3.715E-02, 3.181E-02
763 , 2.829E-02, 2.582E-02, 2.257E-02
764 , 2.057E-02, 1.789E-02, 1.664E-02 };
766 Double_t en[kN] = { 1.00000E-03, 1.50000E-03, 2.00000E-03
767 , 3.00000E-03, 4.00000E-03, 5.00000E-03
768 , 6.00000E-03, 8.00000E-03, 1.00000E-02
769 , 1.50000E-02, 2.00000E-02, 3.00000E-02
770 , 4.00000E-02, 5.00000E-02, 6.00000E-02
771 , 8.00000E-02, 1.00000E-01, 1.50000E-01
772 , 2.00000E-01, 3.00000E-01, 4.00000E-01
773 , 5.00000E-01, 6.00000E-01, 8.00000E-01
774 , 1.00000E+00, 1.25000E+00, 1.50000E+00
775 , 2.00000E+00, 3.00000E+00, 4.00000E+00
776 , 5.00000E+00, 6.00000E+00, 8.00000E+00
777 , 1.00000E+01, 1.50000E+01, 2.00000E+01 };
779 return Interpolate(energyMeV,en,mu,kN);
783 //_____________________________________________________________________________
784 Double_t AliTRDsimTR::GetMuN2(Double_t energyMeV)
787 // Returns the photon absorbtion cross section for nitrogen
792 Double_t mu[kN] = { 3.311E+03, 1.083E+03, 4.769E+02
793 , 1.456E+02, 6.166E+01, 3.144E+01
794 , 1.809E+01, 7.562E+00, 3.879E+00
795 , 1.236E+00, 6.178E-01, 3.066E-01
796 , 2.288E-01, 1.980E-01, 1.817E-01
797 , 1.639E-01, 1.529E-01, 1.353E-01
798 , 1.233E-01, 1.068E-01, 9.557E-02
799 , 8.719E-02, 8.063E-02, 7.081E-02
800 , 6.364E-02, 5.693E-02, 5.180E-02
801 , 4.450E-02, 3.579E-02, 3.073E-02
802 , 2.742E-02, 2.511E-02, 2.209E-02
803 , 2.024E-02, 1.782E-02, 1.673E-02 };
805 Double_t en[kN] = { 1.00000E-03, 1.50000E-03, 2.00000E-03
806 , 3.00000E-03, 4.00000E-03, 5.00000E-03
807 , 6.00000E-03, 8.00000E-03, 1.00000E-02
808 , 1.50000E-02, 2.00000E-02, 3.00000E-02
809 , 4.00000E-02, 5.00000E-02, 6.00000E-02
810 , 8.00000E-02, 1.00000E-01, 1.50000E-01
811 , 2.00000E-01, 3.00000E-01, 4.00000E-01
812 , 5.00000E-01, 6.00000E-01, 8.00000E-01
813 , 1.00000E+00, 1.25000E+00, 1.50000E+00
814 , 2.00000E+00, 3.00000E+00, 4.00000E+00
815 , 5.00000E+00, 6.00000E+00, 8.00000E+00
816 , 1.00000E+01, 1.50000E+01, 2.00000E+01 };
818 return Interpolate(energyMeV,en,mu,kN);
822 //_____________________________________________________________________________
823 Double_t AliTRDsimTR::GetMuO2(Double_t energyMeV)
826 // Returns the photon absorbtion cross section for oxygen
831 Double_t mu[kN] = { 4.590E+03, 1.549E+03, 6.949E+02
832 , 2.171E+02, 9.315E+01, 4.790E+01
833 , 2.770E+01, 1.163E+01, 5.952E+00
834 , 1.836E+00, 8.651E-01, 3.779E-01
835 , 2.585E-01, 2.132E-01, 1.907E-01
836 , 1.678E-01, 1.551E-01, 1.361E-01
837 , 1.237E-01, 1.070E-01, 9.566E-02
838 , 8.729E-02, 8.070E-02, 7.087E-02
839 , 6.372E-02, 5.697E-02, 5.185E-02
840 , 4.459E-02, 3.597E-02, 3.100E-02
841 , 2.777E-02, 2.552E-02, 2.263E-02
842 , 2.089E-02, 1.866E-02, 1.770E-02 };
844 Double_t en[kN] = { 1.00000E-03, 1.50000E-03, 2.00000E-03
845 , 3.00000E-03, 4.00000E-03, 5.00000E-03
846 , 6.00000E-03, 8.00000E-03, 1.00000E-02
847 , 1.50000E-02, 2.00000E-02, 3.00000E-02
848 , 4.00000E-02, 5.00000E-02, 6.00000E-02
849 , 8.00000E-02, 1.00000E-01, 1.50000E-01
850 , 2.00000E-01, 3.00000E-01, 4.00000E-01
851 , 5.00000E-01, 6.00000E-01, 8.00000E-01
852 , 1.00000E+00, 1.25000E+00, 1.50000E+00
853 , 2.00000E+00, 3.00000E+00, 4.00000E+00
854 , 5.00000E+00, 6.00000E+00, 8.00000E+00
855 , 1.00000E+01, 1.50000E+01, 2.00000E+01 };
857 return Interpolate(energyMeV,en,mu,kN);
861 //_____________________________________________________________________________
862 Double_t AliTRDsimTR::GetMuHe(Double_t energyMeV)
865 // Returns the photon absorbtion cross section for helium
870 Double_t mu[kN] = { 6.084E+01, 1.676E+01, 6.863E+00
871 , 2.007E+00, 9.329E-01, 5.766E-01
872 , 4.195E-01, 2.933E-01, 2.476E-01
873 , 2.092E-01, 1.960E-01, 1.838E-01
874 , 1.763E-01, 1.703E-01, 1.651E-01
875 , 1.562E-01, 1.486E-01, 1.336E-01
876 , 1.224E-01, 1.064E-01, 9.535E-02
877 , 8.707E-02, 8.054E-02, 7.076E-02
878 , 6.362E-02, 5.688E-02, 5.173E-02
879 , 4.422E-02, 3.503E-02, 2.949E-02
880 , 2.577E-02, 2.307E-02, 1.940E-02
881 , 1.703E-02, 1.363E-02, 1.183E-02 };
883 Double_t en[kN] = { 1.00000E-03, 1.50000E-03, 2.00000E-03
884 , 3.00000E-03, 4.00000E-03, 5.00000E-03
885 , 6.00000E-03, 8.00000E-03, 1.00000E-02
886 , 1.50000E-02, 2.00000E-02, 3.00000E-02
887 , 4.00000E-02, 5.00000E-02, 6.00000E-02
888 , 8.00000E-02, 1.00000E-01, 1.50000E-01
889 , 2.00000E-01, 3.00000E-01, 4.00000E-01
890 , 5.00000E-01, 6.00000E-01, 8.00000E-01
891 , 1.00000E+00, 1.25000E+00, 1.50000E+00
892 , 2.00000E+00, 3.00000E+00, 4.00000E+00
893 , 5.00000E+00, 6.00000E+00, 8.00000E+00
894 , 1.00000E+01, 1.50000E+01, 2.00000E+01 };
896 return Interpolate(energyMeV,en,mu,kN);
900 //_____________________________________________________________________________
901 Double_t AliTRDsimTR::GetMuAi(Double_t energyMeV)
904 // Returns the photon absorbtion cross section for air
905 // Implemented by Oliver Busch
910 Double_t mu[kN] = { 0.35854E+04, 0.11841E+04, 0.52458E+03,
911 0.16143E+03, 0.14250E+03, 0.15722E+03,
912 0.77538E+02, 0.40099E+02, 0.23313E+02,
913 0.98816E+01, 0.51000E+01, 0.16079E+01,
914 0.77536E+00, 0.35282E+00, 0.24790E+00,
915 0.20750E+00, 0.18703E+00, 0.16589E+00,
916 0.15375E+00, 0.13530E+00, 0.12311E+00,
917 0.10654E+00, 0.95297E-01, 0.86939E-01,
918 0.80390E-01, 0.70596E-01, 0.63452E-01,
919 0.56754E-01, 0.51644E-01, 0.44382E-01,
920 0.35733E-01, 0.30721E-01, 0.27450E-01,
921 0.25171E-01, 0.22205E-01, 0.20399E-01,
922 0.18053E-01, 0.18057E-01 };
926 Double_t en[kN] = { 0.10000E-02, 0.15000E-02, 0.20000E-02,
927 0.30000E-02, 0.32029E-02, 0.32029E-02,
928 0.40000E-02, 0.50000E-02, 0.60000E-02,
929 0.80000E-02, 0.10000E-01, 0.15000E-01,
930 0.20000E-01, 0.30000E-01, 0.40000E-01,
931 0.50000E-01, 0.60000E-01, 0.80000E-01,
932 0.10000E+00, 0.15000E+00, 0.20000E+00,
933 0.30000E+00, 0.40000E+00, 0.50000E+00,
934 0.60000E+00, 0.80000E+00, 0.10000E+01,
935 0.12500E+01, 0.15000E+01, 0.20000E+01,
936 0.30000E+01, 0.40000E+01, 0.50000E+01,
937 0.60000E+01, 0.80000E+01, 0.10000E+02,
938 0.15000E+02, 0.20000E+02 };
940 return Interpolate(energyMeV,en,mu,kN);
944 //_____________________________________________________________________________
945 Double_t AliTRDsimTR::Interpolate(Double_t energyMeV
946 , Double_t *en, Double_t *mu, Int_t n)
949 // Interpolates the photon absorbtion cross section
950 // for a given energy <energyMeV>.
955 Int_t istat = Locate(en,n,energyMeV,index,de);
957 return (mu[index] - de * (mu[index] - mu[index+1])
958 / (en[index+1] - en[index] ));
966 //_____________________________________________________________________________
967 Int_t AliTRDsimTR::Locate(Double_t *xv, Int_t n, Double_t xval
968 , Int_t &kl, Double_t &dx)
971 // Locates a point (xval) in a 1-dim grid (xv(n))
974 if (xval >= xv[n-1]) {
985 while (kh - kl > 1) {
986 if (xval < xv[km = (kl+kh)/2]) {
993 if ((xval < xv[kl]) ||
996 AliFatal(Form("Locate failed xv[%d] %f xval %f xv[%d] %f!!!\n"
997 ,kl,xv[kl],xval,kl+1,xv[kl+1]));
1007 //_____________________________________________________________________________
1008 Int_t AliTRDsimTR::SelectNFoils(Float_t p) const
1011 // Selects the number of foils corresponding to the momentum
1014 Int_t foils = fNFoils[fNFoilsDim-1];
1016 for (Int_t iFoil = 0; iFoil < fNFoilsDim; iFoil++) {
1017 if (p < fNFoilsUp[iFoil]) {
1018 foils = fNFoils[iFoil];