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 ////////////////////////////////////////////////////////////////////////////
35 #include <TVirtualMC.h>
36 #include <TVirtualMCStack.h>
38 #include "AliModule.h"
40 #include "AliTRDsimTR.h"
44 //_____________________________________________________________________________
45 AliTRDsimTR::AliTRDsimTR()
70 // AliTRDsimTR default constructor
77 //_____________________________________________________________________________
78 AliTRDsimTR::AliTRDsimTR(AliModule *mod, Int_t foil, Int_t gap)
103 // AliTRDsimTR constructor. Takes the material properties of the radiator
104 // foils and the gas in the gaps from AliModule <mod>.
105 // The default number of foils is 100 with a thickness of 20 mu. The
106 // thickness of the gaps is 500 mu.
124 mod->AliGetMaterial(foil,name,aFoil,zFoil,rhoFoil,rad,abs);
125 mod->AliGetMaterial(gap ,name,aGap ,zGap ,rhoGap ,rad,abs);
130 fFoilOmega = Omega(fFoilDens,fFoilZ,fFoilA);
135 fGapOmega = Omega(fGapDens ,fGapZ ,fGapA );
139 //_____________________________________________________________________________
140 AliTRDsimTR::AliTRDsimTR(const AliTRDsimTR &s)
142 ,fNFoilsDim(s.fNFoilsDim)
145 ,fFoilThick(s.fFoilThick)
146 ,fGapThick(s.fGapThick)
147 ,fFoilDens(s.fFoilDens)
148 ,fGapDens(s.fGapDens)
149 ,fFoilOmega(s.fFoilOmega)
150 ,fGapOmega(s.fGapOmega)
156 ,fSpNBins(s.fSpNBins)
157 ,fSpRange(s.fSpRange)
158 ,fSpBinWidth(s.fSpBinWidth)
159 ,fSpLower(s.fSpLower)
160 ,fSpUpper(s.fSpUpper)
165 // AliTRDsimTR copy constructor
168 fNFoils = new Int_t[fNFoilsDim];
169 for (Int_t iFoil = 0; iFoil < fNFoilsDim; iFoil++) {
170 fNFoils[iFoil] = ((AliTRDsimTR &) s).fNFoils[iFoil];
173 fNFoilsUp = new Double_t[fNFoilsDim];
174 for (Int_t iFoil = 0; iFoil < fNFoilsDim; iFoil++) {
175 fNFoilsUp[iFoil] = ((AliTRDsimTR &) s).fNFoilsUp[iFoil];
178 fSigma = new Double_t[fSpNBins];
179 for (Int_t iBin = 0; iBin < fSpNBins; iBin++) {
180 fSigma[iBin] = ((AliTRDsimTR &) s).fSigma[iBin];
183 fSpectrum->Copy(*((AliTRDsimTR &) s).fSpectrum);
187 //_____________________________________________________________________________
188 AliTRDsimTR::~AliTRDsimTR()
191 // AliTRDsimTR destructor
216 //_____________________________________________________________________________
217 AliTRDsimTR &AliTRDsimTR::operator=(const AliTRDsimTR &s)
220 // Assignment operator
223 if (this != &s) ((AliTRDsimTR &) s).Copy(*this);
229 //_____________________________________________________________________________
230 void AliTRDsimTR::Copy(TObject &s) const
236 ((AliTRDsimTR &) s).fFoilThick = fFoilThick;
237 ((AliTRDsimTR &) s).fFoilDens = fFoilDens;
238 ((AliTRDsimTR &) s).fFoilOmega = fFoilOmega;
239 ((AliTRDsimTR &) s).fFoilZ = fFoilZ;
240 ((AliTRDsimTR &) s).fFoilA = fFoilA;
241 ((AliTRDsimTR &) s).fGapThick = fGapThick;
242 ((AliTRDsimTR &) s).fGapDens = fGapDens;
243 ((AliTRDsimTR &) s).fGapOmega = fGapOmega;
244 ((AliTRDsimTR &) s).fGapZ = fGapZ;
245 ((AliTRDsimTR &) s).fGapA = fGapA;
246 ((AliTRDsimTR &) s).fTemp = fTemp;
247 ((AliTRDsimTR &) s).fSpNBins = fSpNBins;
248 ((AliTRDsimTR &) s).fSpRange = fSpRange;
249 ((AliTRDsimTR &) s).fSpBinWidth = fSpBinWidth;
250 ((AliTRDsimTR &) s).fSpLower = fSpLower;
251 ((AliTRDsimTR &) s).fSpUpper = fSpUpper;
253 if (((AliTRDsimTR &) s).fNFoils) {
254 delete [] ((AliTRDsimTR &) s).fNFoils;
256 ((AliTRDsimTR &) s).fNFoils = new Int_t[fNFoilsDim];
257 for (Int_t iFoil = 0; iFoil < fNFoilsDim; iFoil++) {
258 ((AliTRDsimTR &) s).fNFoils[iFoil] = fNFoils[iFoil];
261 if (((AliTRDsimTR &) s).fNFoilsUp) {
262 delete [] ((AliTRDsimTR &) s).fNFoilsUp;
264 ((AliTRDsimTR &) s).fNFoilsUp = new Double_t[fNFoilsDim];
265 for (Int_t iFoil = 0; iFoil < fNFoilsDim; iFoil++) {
266 ((AliTRDsimTR &) s).fNFoilsUp[iFoil] = fNFoilsUp[iFoil];
269 if (((AliTRDsimTR &) s).fSigma) {
270 delete [] ((AliTRDsimTR &) s).fSigma;
272 ((AliTRDsimTR &) s).fSigma = new Double_t[fSpNBins];
273 for (Int_t iBin = 0; iBin < fSpNBins; iBin++) {
274 ((AliTRDsimTR &) s).fSigma[iBin] = fSigma[iBin];
277 fSpectrum->Copy(*((AliTRDsimTR &) s).fSpectrum);
281 //_____________________________________________________________________________
282 void AliTRDsimTR::Init()
286 // The default radiator are prolypropilene foils of 10 mu thickness
287 // with gaps of 80 mu filled with N2.
295 fNFoils = new Int_t[fNFoilsDim];
307 fNFoilsUp = new Double_t[fNFoilsDim];
314 fNFoilsUp[6] = 10000.0;
320 fFoilOmega = Omega(fFoilDens,fFoilZ,fFoilA);
326 fGapOmega = Omega(fGapDens ,fGapZ ,fGapA );
332 fSpBinWidth = fSpRange / fSpNBins;
333 fSpLower = 1.0 - 0.5 * fSpBinWidth;
334 fSpUpper = fSpLower + fSpRange;
336 if (fSpectrum) delete fSpectrum;
337 fSpectrum = new TH1D("TRspectrum","TR spectrum",fSpNBins,fSpLower,fSpUpper);
338 fSpectrum->SetDirectory(0);
340 // Set the sigma values
345 //_____________________________________________________________________________
346 Int_t AliTRDsimTR::CreatePhotons(Int_t pdg, Float_t p
347 , Int_t &nPhoton, Float_t *ePhoton)
350 // Create TRD photons for a charged particle of type <pdg> with the total
352 // Number of produced TR photons: <nPhoton>
353 // Energies of the produced TR photons: <ePhoton>
357 const Int_t kPdgEle = 11;
358 const Int_t kPdgMuon = 13;
359 const Int_t kPdgPion = 211;
360 const Int_t kPdgKaon = 321;
363 switch (TMath::Abs(pdg)) {
381 // Calculate the TR photons
382 return TrPhotons(p, mass, nPhoton, ePhoton);
386 //_____________________________________________________________________________
387 Int_t AliTRDsimTR::TrPhotons(Float_t p, Float_t mass
388 , Int_t &nPhoton, Float_t *ePhoton)
391 // Produces TR photons using a parametric model for regular radiator. Photons
392 // with energy larger than 15 keV are included in the MC stack and tracked by VMC
396 // p - parent momentum [GeV/c]
397 // mass - parent mass
400 // nPhoton - number of photons which have to be processed by custom code
401 // ePhoton - energy of this photons in keV.
404 const Double_t kAlpha = 0.0072973;
405 const Int_t kSumMax = 30;
407 Double_t tau = fGapThick / fFoilThick;
410 Double_t gamma = TMath::Sqrt(p*p + mass*mass) / mass;
412 // Select the number of foils corresponding to momentum
413 Int_t foils = SelectNFoils(p);
429 for (Int_t iBin = 1; iBin <= fSpNBins; iBin++) {
431 energykeV = fSpectrum->GetBinCenter(iBin);
432 energyeV = energykeV * 1.0e3;
434 sigma = Sigma(energykeV);
436 csi1 = fFoilOmega / energyeV;
437 csi2 = fGapOmega / energyeV;
439 rho1 = 2.5 * energyeV * fFoilThick * 1.0e4
440 * (1.0 / (gamma*gamma) + csi1*csi1);
441 rho2 = 2.5 * energyeV * fFoilThick * 1.0e4
442 * (1.0 / (gamma*gamma) + csi2 *csi2);
446 for (Int_t n = 1; n <= kSumMax; n++) {
447 thetaN = (TMath::Pi() * 2.0 * n - (rho1 + tau * rho2)) / (1.0 + tau);
451 aux = 1.0 / (rho1 + thetaN) - 1.0 / (rho2 + thetaN);
452 sum += thetaN * (aux*aux) * (1.0 - TMath::Cos(rho1 + thetaN));
455 // Equivalent number of foils
456 nEqu = (1.0 - TMath::Exp(-foils * sigma)) / (1.0 - TMath::Exp(-sigma));
459 fSpectrum->SetBinContent(iBin,4.0 * kAlpha * nEqu * sum / (energykeV * (1.0 + tau)));
463 // <nTR> (binsize corr.)
464 Float_t nTr = fSpBinWidth * fSpectrum->Integral();
465 // Number of TR photons from Poisson distribution with mean <nTr>
466 Int_t nPhCand = gRandom->Poisson(nTr);
468 // Link the MC stack and get info about parent electron
469 TVirtualMCStack *stack = gMC->GetStack();
470 Int_t track = stack->GetCurrentTrackNumber();
471 Double_t px, py, pz, ptot;
472 gMC->TrackMomentum(px,py,pz,ptot);
473 ptot = TMath::Sqrt(px*px+py*py+pz*pz);
478 // Current position of electron
482 gMC->TrackPosition(x,y,z);
483 Double_t t = gMC->TrackTime();
485 // Counter for TR analysed in custom code (e < 15keV)
488 for (Int_t iPhoton = 0; iPhoton < nPhCand; iPhoton++) {
490 // Energy of the TR photon
491 Double_t e = fSpectrum->GetRandom();
493 // Put TR photon on particle stack
496 e *= 1.0e-6; // Convert it to GeV
499 stack->PushTrack(1 // Must be 1
500 ,track // Identifier of the parent track, -1 for a primary
501 ,22 // Particle code.
502 ,px*e // 4 momentum (The photon is generated on the same
503 ,py*e // direction as the parent. For irregular radiator one
504 ,pz*e // can calculate also the angle but this is a secondary
507 ,0.0,0.0,0.0 // Polarisation
508 ,kPFeedBackPhoton // Production mechanism (there is no TR in G3 so one
509 // has to make some convention)
510 ,phtrack // On output the number of the track stored
515 // Custom treatment of TR photons
518 ePhoton[nPhoton++] = e;
528 //_____________________________________________________________________________
529 void AliTRDsimTR::SetSigma()
532 // Sets the absorbtion crosssection for the energies of the TR spectrum
538 fSigma = new Double_t[fSpNBins];
540 for (Int_t iBin = 0; iBin < fSpNBins; iBin++) {
541 Double_t energykeV = iBin * fSpBinWidth + 1.0;
542 fSigma[iBin] = Sigma(energykeV);
547 //_____________________________________________________________________________
548 Double_t AliTRDsimTR::Sigma(Double_t energykeV)
551 // Calculates the absorbtion crosssection for a one-foil-one-gap-radiator
555 Double_t energyMeV = energykeV * 0.001;
556 if (energyMeV >= 0.001) {
557 return(GetMuPo(energyMeV) * fFoilDens * fFoilThick +
558 GetMuAi(energyMeV) * fGapDens * fGapThick * GetTemp());
566 //_____________________________________________________________________________
567 Double_t AliTRDsimTR::GetMuPo(Double_t energyMeV)
570 // Returns the photon absorbtion cross section for polypropylene
575 Double_t mu[kN] = { 1.894E+03, 5.999E+02, 2.593E+02
576 , 7.743E+01, 3.242E+01, 1.643E+01
577 , 9.432E+00, 3.975E+00, 2.088E+00
578 , 7.452E-01, 4.315E-01, 2.706E-01
579 , 2.275E-01, 2.084E-01, 1.970E-01
580 , 1.823E-01, 1.719E-01, 1.534E-01
581 , 1.402E-01, 1.217E-01, 1.089E-01
582 , 9.947E-02, 9.198E-02, 8.078E-02
583 , 7.262E-02, 6.495E-02, 5.910E-02
584 , 5.064E-02, 4.045E-02, 3.444E-02
585 , 3.045E-02, 2.760E-02, 2.383E-02
586 , 2.145E-02, 1.819E-02, 1.658E-02 };
588 Double_t en[kN] = { 1.000E-03, 1.500E-03, 2.000E-03
589 , 3.000E-03, 4.000E-03, 5.000E-03
590 , 6.000E-03, 8.000E-03, 1.000E-02
591 , 1.500E-02, 2.000E-02, 3.000E-02
592 , 4.000E-02, 5.000E-02, 6.000E-02
593 , 8.000E-02, 1.000E-01, 1.500E-01
594 , 2.000E-01, 3.000E-01, 4.000E-01
595 , 5.000E-01, 6.000E-01, 8.000E-01
596 , 1.000E+00, 1.250E+00, 1.500E+00
597 , 2.000E+00, 3.000E+00, 4.000E+00
598 , 5.000E+00, 6.000E+00, 8.000E+00
599 , 1.000E+01, 1.500E+01, 2.000E+01 };
601 return Interpolate(energyMeV,en,mu,kN);
605 //_____________________________________________________________________________
606 Double_t AliTRDsimTR::GetMuCO(Double_t energyMeV)
609 // Returns the photon absorbtion cross section for CO2
614 Double_t mu[kN] = { 0.39383E+04, 0.13166E+04, 0.58750E+03
615 , 0.18240E+03, 0.77996E+02, 0.40024E+02
616 , 0.23116E+02, 0.96997E+01, 0.49726E+01
617 , 0.15543E+01, 0.74915E+00, 0.34442E+00
618 , 0.24440E+00, 0.20589E+00, 0.18632E+00
619 , 0.16578E+00, 0.15394E+00, 0.13558E+00
620 , 0.12336E+00, 0.10678E+00, 0.95510E-01
621 , 0.87165E-01, 0.80587E-01, 0.70769E-01
622 , 0.63626E-01, 0.56894E-01, 0.51782E-01
623 , 0.44499E-01, 0.35839E-01, 0.30825E-01
624 , 0.27555E-01, 0.25269E-01, 0.22311E-01
625 , 0.20516E-01, 0.18184E-01, 0.17152E-01 };
627 Double_t en[kN] = { 0.10000E-02, 0.15000E-02, 0.20000E-02
628 , 0.30000E-02, 0.40000E-02, 0.50000E-02
629 , 0.60000E-02, 0.80000E-02, 0.10000E-01
630 , 0.15000E-01, 0.20000E-01, 0.30000E-01
631 , 0.40000E-01, 0.50000E-01, 0.60000E-01
632 , 0.80000E-01, 0.10000E+00, 0.15000E+00
633 , 0.20000E+00, 0.30000E+00, 0.40000E+00
634 , 0.50000E+00, 0.60000E+00, 0.80000E+00
635 , 0.10000E+01, 0.12500E+01, 0.15000E+01
636 , 0.20000E+01, 0.30000E+01, 0.40000E+01
637 , 0.50000E+01, 0.60000E+01, 0.80000E+01
638 , 0.10000E+02, 0.15000E+02, 0.20000E+02 };
640 return Interpolate(energyMeV,en,mu,kN);
644 //_____________________________________________________________________________
645 Double_t AliTRDsimTR::GetMuXe(Double_t energyMeV)
648 // Returns the photon absorbtion cross section for xenon
653 Double_t mu[kN] = { 9.413E+03, 8.151E+03, 7.035E+03
654 , 7.338E+03, 4.085E+03, 2.088E+03
655 , 7.780E+02, 3.787E+02, 2.408E+02
656 , 6.941E+02, 6.392E+02, 6.044E+02
657 , 8.181E+02, 7.579E+02, 6.991E+02
658 , 8.064E+02, 6.376E+02, 3.032E+02
659 , 1.690E+02, 5.743E+01, 2.652E+01
660 , 8.930E+00, 6.129E+00, 3.316E+01
661 , 2.270E+01, 1.272E+01, 7.825E+00
662 , 3.633E+00, 2.011E+00, 7.202E-01
663 , 3.760E-01, 1.797E-01, 1.223E-01
664 , 9.699E-02, 8.281E-02, 6.696E-02
665 , 5.785E-02, 5.054E-02, 4.594E-02
666 , 4.078E-02, 3.681E-02, 3.577E-02
667 , 3.583E-02, 3.634E-02, 3.797E-02
668 , 3.987E-02, 4.445E-02, 4.815E-02 };
670 Double_t en[kN] = { 1.00000E-03, 1.07191E-03, 1.14900E-03
671 , 1.14900E-03, 1.50000E-03, 2.00000E-03
672 , 3.00000E-03, 4.00000E-03, 4.78220E-03
673 , 4.78220E-03, 5.00000E-03, 5.10370E-03
674 , 5.10370E-03, 5.27536E-03, 5.45280E-03
675 , 5.45280E-03, 6.00000E-03, 8.00000E-03
676 , 1.00000E-02, 1.50000E-02, 2.00000E-02
677 , 3.00000E-02, 3.45614E-02, 3.45614E-02
678 , 4.00000E-02, 5.00000E-02, 6.00000E-02
679 , 8.00000E-02, 1.00000E-01, 1.50000E-01
680 , 2.00000E-01, 3.00000E-01, 4.00000E-01
681 , 5.00000E-01, 6.00000E-01, 8.00000E-01
682 , 1.00000E+00, 1.25000E+00, 1.50000E+00
683 , 2.00000E+00, 3.00000E+00, 4.00000E+00
684 , 5.00000E+00, 6.00000E+00, 8.00000E+00
685 , 1.00000E+01, 1.50000E+01, 2.00000E+01 };
687 return Interpolate(energyMeV,en,mu,kN);
691 //_____________________________________________________________________________
692 Double_t AliTRDsimTR::GetMuAr(Double_t energyMeV)
695 // Returns the photon absorbtion cross section for argon
700 Double_t mu[kN] = { 3.184E+03, 1.105E+03, 5.120E+02
701 , 1.703E+02, 1.424E+02, 1.275E+03
702 , 7.572E+02, 4.225E+02, 2.593E+02
703 , 1.180E+02, 6.316E+01, 1.983E+01
704 , 8.629E+00, 2.697E+00, 1.228E+00
705 , 7.012E-01, 4.664E-01, 2.760E-01
706 , 2.043E-01, 1.427E-01, 1.205E-01
707 , 9.953E-02, 8.776E-02, 7.958E-02
708 , 7.335E-02, 6.419E-02, 5.762E-02
709 , 5.150E-02, 4.695E-02, 4.074E-02
710 , 3.384E-02, 3.019E-02, 2.802E-02
711 , 2.667E-02, 2.517E-02, 2.451E-02
712 , 2.418E-02, 2.453E-02 };
714 Double_t en[kN] = { 1.00000E-03, 1.50000E-03, 2.00000E-03
715 , 3.00000E-03, 3.20290E-03, 3.20290E-03
716 , 4.00000E-03, 5.00000E-03, 6.00000E-03
717 , 8.00000E-03, 1.00000E-02, 1.50000E-02
718 , 2.00000E-02, 3.00000E-02, 4.00000E-02
719 , 5.00000E-02, 6.00000E-02, 8.00000E-02
720 , 1.00000E-01, 1.50000E-01, 2.00000E-01
721 , 3.00000E-01, 4.00000E-01, 5.00000E-01
722 , 6.00000E-01, 8.00000E-01, 1.00000E+00
723 , 1.25000E+00, 1.50000E+00, 2.00000E+00
724 , 3.00000E+00, 4.00000E+00, 5.00000E+00
725 , 6.00000E+00, 8.00000E+00, 1.00000E+01
726 , 1.50000E+01, 2.00000E+01 };
728 return Interpolate(energyMeV,en,mu,kN);
732 //_____________________________________________________________________________
733 Double_t AliTRDsimTR::GetMuMy(Double_t energyMeV)
736 // Returns the photon absorbtion cross section for mylar
741 Double_t mu[kN] = { 2.911E+03, 9.536E+02, 4.206E+02
742 , 1.288E+02, 5.466E+01, 2.792E+01
743 , 1.608E+01, 6.750E+00, 3.481E+00
744 , 1.132E+00, 5.798E-01, 3.009E-01
745 , 2.304E-01, 2.020E-01, 1.868E-01
746 , 1.695E-01, 1.586E-01, 1.406E-01
747 , 1.282E-01, 1.111E-01, 9.947E-02
748 , 9.079E-02, 8.395E-02, 7.372E-02
749 , 6.628E-02, 5.927E-02, 5.395E-02
750 , 4.630E-02, 3.715E-02, 3.181E-02
751 , 2.829E-02, 2.582E-02, 2.257E-02
752 , 2.057E-02, 1.789E-02, 1.664E-02 };
754 Double_t en[kN] = { 1.00000E-03, 1.50000E-03, 2.00000E-03
755 , 3.00000E-03, 4.00000E-03, 5.00000E-03
756 , 6.00000E-03, 8.00000E-03, 1.00000E-02
757 , 1.50000E-02, 2.00000E-02, 3.00000E-02
758 , 4.00000E-02, 5.00000E-02, 6.00000E-02
759 , 8.00000E-02, 1.00000E-01, 1.50000E-01
760 , 2.00000E-01, 3.00000E-01, 4.00000E-01
761 , 5.00000E-01, 6.00000E-01, 8.00000E-01
762 , 1.00000E+00, 1.25000E+00, 1.50000E+00
763 , 2.00000E+00, 3.00000E+00, 4.00000E+00
764 , 5.00000E+00, 6.00000E+00, 8.00000E+00
765 , 1.00000E+01, 1.50000E+01, 2.00000E+01 };
767 return Interpolate(energyMeV,en,mu,kN);
771 //_____________________________________________________________________________
772 Double_t AliTRDsimTR::GetMuN2(Double_t energyMeV)
775 // Returns the photon absorbtion cross section for nitrogen
780 Double_t mu[kN] = { 3.311E+03, 1.083E+03, 4.769E+02
781 , 1.456E+02, 6.166E+01, 3.144E+01
782 , 1.809E+01, 7.562E+00, 3.879E+00
783 , 1.236E+00, 6.178E-01, 3.066E-01
784 , 2.288E-01, 1.980E-01, 1.817E-01
785 , 1.639E-01, 1.529E-01, 1.353E-01
786 , 1.233E-01, 1.068E-01, 9.557E-02
787 , 8.719E-02, 8.063E-02, 7.081E-02
788 , 6.364E-02, 5.693E-02, 5.180E-02
789 , 4.450E-02, 3.579E-02, 3.073E-02
790 , 2.742E-02, 2.511E-02, 2.209E-02
791 , 2.024E-02, 1.782E-02, 1.673E-02 };
793 Double_t en[kN] = { 1.00000E-03, 1.50000E-03, 2.00000E-03
794 , 3.00000E-03, 4.00000E-03, 5.00000E-03
795 , 6.00000E-03, 8.00000E-03, 1.00000E-02
796 , 1.50000E-02, 2.00000E-02, 3.00000E-02
797 , 4.00000E-02, 5.00000E-02, 6.00000E-02
798 , 8.00000E-02, 1.00000E-01, 1.50000E-01
799 , 2.00000E-01, 3.00000E-01, 4.00000E-01
800 , 5.00000E-01, 6.00000E-01, 8.00000E-01
801 , 1.00000E+00, 1.25000E+00, 1.50000E+00
802 , 2.00000E+00, 3.00000E+00, 4.00000E+00
803 , 5.00000E+00, 6.00000E+00, 8.00000E+00
804 , 1.00000E+01, 1.50000E+01, 2.00000E+01 };
806 return Interpolate(energyMeV,en,mu,kN);
810 //_____________________________________________________________________________
811 Double_t AliTRDsimTR::GetMuO2(Double_t energyMeV)
814 // Returns the photon absorbtion cross section for oxygen
819 Double_t mu[kN] = { 4.590E+03, 1.549E+03, 6.949E+02
820 , 2.171E+02, 9.315E+01, 4.790E+01
821 , 2.770E+01, 1.163E+01, 5.952E+00
822 , 1.836E+00, 8.651E-01, 3.779E-01
823 , 2.585E-01, 2.132E-01, 1.907E-01
824 , 1.678E-01, 1.551E-01, 1.361E-01
825 , 1.237E-01, 1.070E-01, 9.566E-02
826 , 8.729E-02, 8.070E-02, 7.087E-02
827 , 6.372E-02, 5.697E-02, 5.185E-02
828 , 4.459E-02, 3.597E-02, 3.100E-02
829 , 2.777E-02, 2.552E-02, 2.263E-02
830 , 2.089E-02, 1.866E-02, 1.770E-02 };
832 Double_t en[kN] = { 1.00000E-03, 1.50000E-03, 2.00000E-03
833 , 3.00000E-03, 4.00000E-03, 5.00000E-03
834 , 6.00000E-03, 8.00000E-03, 1.00000E-02
835 , 1.50000E-02, 2.00000E-02, 3.00000E-02
836 , 4.00000E-02, 5.00000E-02, 6.00000E-02
837 , 8.00000E-02, 1.00000E-01, 1.50000E-01
838 , 2.00000E-01, 3.00000E-01, 4.00000E-01
839 , 5.00000E-01, 6.00000E-01, 8.00000E-01
840 , 1.00000E+00, 1.25000E+00, 1.50000E+00
841 , 2.00000E+00, 3.00000E+00, 4.00000E+00
842 , 5.00000E+00, 6.00000E+00, 8.00000E+00
843 , 1.00000E+01, 1.50000E+01, 2.00000E+01 };
845 return Interpolate(energyMeV,en,mu,kN);
849 //_____________________________________________________________________________
850 Double_t AliTRDsimTR::GetMuHe(Double_t energyMeV)
853 // Returns the photon absorbtion cross section for helium
858 Double_t mu[kN] = { 6.084E+01, 1.676E+01, 6.863E+00
859 , 2.007E+00, 9.329E-01, 5.766E-01
860 , 4.195E-01, 2.933E-01, 2.476E-01
861 , 2.092E-01, 1.960E-01, 1.838E-01
862 , 1.763E-01, 1.703E-01, 1.651E-01
863 , 1.562E-01, 1.486E-01, 1.336E-01
864 , 1.224E-01, 1.064E-01, 9.535E-02
865 , 8.707E-02, 8.054E-02, 7.076E-02
866 , 6.362E-02, 5.688E-02, 5.173E-02
867 , 4.422E-02, 3.503E-02, 2.949E-02
868 , 2.577E-02, 2.307E-02, 1.940E-02
869 , 1.703E-02, 1.363E-02, 1.183E-02 };
871 Double_t en[kN] = { 1.00000E-03, 1.50000E-03, 2.00000E-03
872 , 3.00000E-03, 4.00000E-03, 5.00000E-03
873 , 6.00000E-03, 8.00000E-03, 1.00000E-02
874 , 1.50000E-02, 2.00000E-02, 3.00000E-02
875 , 4.00000E-02, 5.00000E-02, 6.00000E-02
876 , 8.00000E-02, 1.00000E-01, 1.50000E-01
877 , 2.00000E-01, 3.00000E-01, 4.00000E-01
878 , 5.00000E-01, 6.00000E-01, 8.00000E-01
879 , 1.00000E+00, 1.25000E+00, 1.50000E+00
880 , 2.00000E+00, 3.00000E+00, 4.00000E+00
881 , 5.00000E+00, 6.00000E+00, 8.00000E+00
882 , 1.00000E+01, 1.50000E+01, 2.00000E+01 };
884 return Interpolate(energyMeV,en,mu,kN);
888 //_____________________________________________________________________________
889 Double_t AliTRDsimTR::GetMuAi(Double_t energyMeV)
892 // Returns the photon absorbtion cross section for air
893 // Implemented by Oliver Busch
898 Double_t mu[kN] = { 0.35854E+04, 0.11841E+04, 0.52458E+03,
899 0.16143E+03, 0.14250E+03, 0.15722E+03,
900 0.77538E+02, 0.40099E+02, 0.23313E+02,
901 0.98816E+01, 0.51000E+01, 0.16079E+01,
902 0.77536E+00, 0.35282E+00, 0.24790E+00,
903 0.20750E+00, 0.18703E+00, 0.16589E+00,
904 0.15375E+00, 0.13530E+00, 0.12311E+00,
905 0.10654E+00, 0.95297E-01, 0.86939E-01,
906 0.80390E-01, 0.70596E-01, 0.63452E-01,
907 0.56754E-01, 0.51644E-01, 0.44382E-01,
908 0.35733E-01, 0.30721E-01, 0.27450E-01,
909 0.25171E-01, 0.22205E-01, 0.20399E-01,
910 0.18053E-01, 0.18057E-01 };
914 Double_t en[kN] = { 0.10000E-02, 0.15000E-02, 0.20000E-02,
915 0.30000E-02, 0.32029E-02, 0.32029E-02,
916 0.40000E-02, 0.50000E-02, 0.60000E-02,
917 0.80000E-02, 0.10000E-01, 0.15000E-01,
918 0.20000E-01, 0.30000E-01, 0.40000E-01,
919 0.50000E-01, 0.60000E-01, 0.80000E-01,
920 0.10000E+00, 0.15000E+00, 0.20000E+00,
921 0.30000E+00, 0.40000E+00, 0.50000E+00,
922 0.60000E+00, 0.80000E+00, 0.10000E+01,
923 0.12500E+01, 0.15000E+01, 0.20000E+01,
924 0.30000E+01, 0.40000E+01, 0.50000E+01,
925 0.60000E+01, 0.80000E+01, 0.10000E+02,
926 0.15000E+02, 0.20000E+02 };
928 return Interpolate(energyMeV,en,mu,kN);
932 //_____________________________________________________________________________
933 Double_t AliTRDsimTR::Interpolate(Double_t energyMeV
935 , const Double_t * const mu
939 // Interpolates the photon absorbtion cross section
940 // for a given energy <energyMeV>.
945 Int_t istat = Locate(en,n,energyMeV,index,de);
947 return (mu[index] - de * (mu[index] - mu[index+1])
948 / (en[index+1] - en[index] ));
956 //_____________________________________________________________________________
957 Int_t AliTRDsimTR::Locate(Double_t *xv, Int_t n, Double_t xval
958 , Int_t &kl, Double_t &dx)
961 // Locates a point (xval) in a 1-dim grid (xv(n))
964 if (xval >= xv[n-1]) {
975 while (kh - kl > 1) {
976 if (xval < xv[km = (kl+kh)/2]) {
983 if ((xval < xv[kl]) ||
986 AliFatal(Form("Locate failed xv[%d] %f xval %f xv[%d] %f!!!\n"
987 ,kl,xv[kl],xval,kl+1,xv[kl+1]));
997 //_____________________________________________________________________________
998 Int_t AliTRDsimTR::SelectNFoils(Float_t p) const
1001 // Selects the number of foils corresponding to the momentum
1004 Int_t foils = fNFoils[fNFoilsDim-1];
1006 for (Int_t iFoil = 0; iFoil < fNFoilsDim; iFoil++) {
1007 if (p < fNFoilsUp[iFoil]) {
1008 foils = fNFoils[iFoil];