Gabriele Cosmo
198 lines
7.3 KiB
C++
198 lines
7.3 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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/// \file XTRTransparentRegRadModel.cc
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/// \brief Implementation of the XTRTransparentRegRadModel class
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#include "XTRTransparentRegRadModel.hh"
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#include "G4Gamma.hh"
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#include "G4Integrator.hh"
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#include "G4PhysicalConstants.hh"
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#include "Randomize.hh"
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#include <complex>
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using namespace std;
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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////////////////////////////////////////////////////////////////////////////
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//
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// Constructor, destructor
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XTRTransparentRegRadModel::XTRTransparentRegRadModel(G4LogicalVolume* anEnvelope,
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G4Material* foilMat, G4Material* gasMat,
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G4double a, G4double b, G4int n,
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const G4String& processName)
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: G4VXTRenergyLoss(anEnvelope, foilMat, gasMat, a, b, n, processName)
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{
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G4cout << "Regular transparent X-ray TR radiator EM process is called" << G4endl;
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// Build energy and angular integral spectra of X-ray TR photons from
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// a radiator
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fExitFlux = true;
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fAlphaPlate = 10000;
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fAlphaGas = 1000;
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// BuildTable();
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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XTRTransparentRegRadModel::~XTRTransparentRegRadModel()
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{
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;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4double XTRTransparentRegRadModel::SpectralXTRdEdx(G4double energy)
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{
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G4double result, sum = 0., tmp, cof1, cof2, cofMin, cofPHC, aMa, bMb, sigma;
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G4int k, kMax, kMin;
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aMa = GetPlateLinearPhotoAbs(energy);
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bMb = GetGasLinearPhotoAbs(energy);
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// if(fCompton)
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{
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aMa += GetPlateCompton(energy);
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bMb += GetGasCompton(energy);
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}
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aMa *= fPlateThick;
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bMb *= fGasThick;
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sigma = aMa + bMb;
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cofPHC = 4 * pi * hbarc;
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cofPHC *= 200. / 197.;
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tmp = (fSigma1 - fSigma2) / cofPHC / energy;
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cof1 = fPlateThick * tmp;
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cof2 = fGasThick * tmp;
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cofMin = energy * (fPlateThick + fGasThick) / fGamma / fGamma;
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cofMin += (fPlateThick * fSigma1 + fGasThick * fSigma2) / energy;
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cofMin /= cofPHC;
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// if (fGamma < 1200) kMin = G4int(cofMin); // 1200 ?
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// else kMin = 1;
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kMin = G4int(cofMin);
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if (cofMin > kMin) kMin++;
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// tmp = (fPlateThick + fGasThick)*energy*fMaxThetaTR;
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// tmp /= cofPHC;
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// kMax = G4int(tmp);
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// if(kMax < 0) kMax = 0;
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// kMax += kMin;
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kMax = kMin + 9; // 5; // 9; // kMin + G4int(tmp);
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// tmp /= fGamma;
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// if( G4int(tmp) < kMin ) kMin = G4int(tmp);
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// G4cout<<"kMin = "<<kMin<<"; kMax = "<<kMax<<G4endl;
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for (k = kMin; k <= kMax; k++) {
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tmp = pi * fPlateThick * (k + cof2) / (fPlateThick + fGasThick);
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result = (k - cof1) * (k - cof1) * (k + cof2) * (k + cof2);
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if (k == kMin && kMin == G4int(cofMin)) {
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sum += 0.5 * sin(tmp) * sin(tmp) * std::abs(k - cofMin) / result;
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}
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else {
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sum += sin(tmp) * sin(tmp) * std::abs(k - cofMin) / result;
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}
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// G4cout<<"k = "<<k<<"; sum = "<<sum<<G4endl;
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}
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result = 4. * (cof1 + cof2) * (cof1 + cof2) * sum / energy;
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result *= (1. - exp(-fPlateNumber * sigma)) / (1. - exp(-sigma));
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return result;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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//
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// Approximation for radiator interference factor for the case of
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// fully Regular radiator. The plate and gas gap thicknesses are fixed .
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// The mean values of the plate and gas gap thicknesses
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// are supposed to be about XTR formation zones but much less than
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// mean absorption length of XTR photons in coresponding material.
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G4double XTRTransparentRegRadModel::GetStackFactor(G4double energy, G4double gamma,
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G4double varAngle)
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{
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/*
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G4double result, Za, Zb, Ma, Mb, sigma;
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Za = GetPlateFormationZone(energy,gamma,varAngle);
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Zb = GetGasFormationZone(energy,gamma,varAngle);
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Ma = GetPlateLinearPhotoAbs(energy);
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Mb = GetGasLinearPhotoAbs(energy);
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sigma = Ma*fPlateThick + Mb*fGasThick;
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G4complex Ca(1.0+0.5*fPlateThick*Ma/fAlphaPlate,fPlateThick/Za/fAlphaPlate);
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G4complex Cb(1.0+0.5*fGasThick*Mb/fAlphaGas,fGasThick/Zb/fAlphaGas);
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G4complex Ha = pow(Ca,-fAlphaPlate);
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G4complex Hb = pow(Cb,-fAlphaGas);
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G4complex H = Ha*Hb;
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G4complex F1 = (1.0 - Ha)*(1.0 - Hb )/(1.0 - H)
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* G4double(fPlateNumber) ;
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G4complex F2 = (1.0-Ha)*(1.0-Ha)*Hb/(1.0-H)/(1.0-H)
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* (1.0 - exp(-0.5*fPlateNumber*sigma)) ;
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// *(1.0 - pow(H,fPlateNumber)) ;
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G4complex R = (F1 + F2)*OneInterfaceXTRdEdx(energy,gamma,varAngle);
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// G4complex R = F2*OneInterfaceXTRdEdx(energy,gamma,varAngle);
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result = 2.0*real(R);
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return result;
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*/
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// numerically unstable result
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G4double result, Qa, Qb, Q, aZa, bZb, aMa, bMb, D, sigma;
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aZa = fPlateThick / GetPlateFormationZone(energy, gamma, varAngle);
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bZb = fGasThick / GetGasFormationZone(energy, gamma, varAngle);
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aMa = fPlateThick * GetPlateLinearPhotoAbs(energy);
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bMb = fGasThick * GetGasLinearPhotoAbs(energy);
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sigma = aMa * fPlateThick + bMb * fGasThick;
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Qa = exp(-0.5 * aMa);
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Qb = exp(-0.5 * bMb);
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Q = Qa * Qb;
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G4complex Ha(Qa * cos(aZa), -Qa * sin(aZa));
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G4complex Hb(Qb * cos(bZb), -Qb * sin(bZb));
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G4complex H = Ha * Hb;
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G4complex Hs = conj(H);
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D = 1.0 / ((1 - Q) * (1 - Q) + 4 * Q * sin(0.5 * (aZa + bZb)) * sin(0.5 * (aZa + bZb)));
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G4complex F1 = (1.0 - Ha) * (1.0 - Hb) * (1.0 - Hs) * G4double(fPlateNumber) * D;
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G4complex F2 = (1.0 - Ha) * (1.0 - Ha) * Hb * (1.0 - Hs)
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* (1.0 - Hs)
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// * (1.0 - pow(H,fPlateNumber)) * D*D;
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* (1.0 - exp(-0.5 * fPlateNumber * sigma)) * D * D;
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G4complex R = (F1 + F2) * OneInterfaceXTRdEdx(energy, gamma, varAngle);
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result = 2.0 * real(R);
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return result;
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}
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