| 1 | //
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| 2 | // ********************************************************************
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| 3 | // * License and Disclaimer *
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| 4 | // * *
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of *
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and *
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| 7 | // * conditions of the Geant4 Software License, included in the file *
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These *
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| 9 | // * include a list of copyright holders. *
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| 10 | // * *
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| 11 | // * Neither the authors of this software system, nor their employing *
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| 12 | // * institutes,nor the agencies providing financial support for this *
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| 13 | // * work make any representation or warranty, express or implied, *
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| 14 | // * regarding this software system or assume any liability for its *
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| 15 | // * use. Please see the license in the file LICENSE and URL above *
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| 16 | // * for the full disclaimer and the limitation of liability. *
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| 17 | // * *
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| 18 | // * This code implementation is the result of the scientific and *
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| 19 | // * technical work of the GEANT4 collaboration. *
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| 20 | // * By using, copying, modifying or distributing the software (or *
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| 21 | // * any work based on the software) you agree to acknowledge its *
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| 22 | // * use in resulting scientific publications, and indicate your *
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| 23 | // * acceptance of all terms of the Geant4 Software license. *
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| 24 | // ********************************************************************
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| 25 | //
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| 26 | //
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| 27 | //
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| 28 |
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| 29 | #include <complex>
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| 30 |
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| 31 | #include "G4XTRGammaRadModel.hh"
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| 32 | #include "Randomize.hh"
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| 33 |
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| 34 | #include "G4Gamma.hh"
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| 35 |
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| 36 | using namespace std;
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| 37 |
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| 38 | ////////////////////////////////////////////////////////////////////////////
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| 39 | //
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| 40 | // Constructor, destructor
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| 41 |
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| 42 | G4XTRGammaRadModel::G4XTRGammaRadModel(G4LogicalVolume* anEnvelope,
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| 43 | G4double alphaPlate,
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| 44 | G4double alphaGas,
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| 45 | G4Material* foilMat,G4Material* gasMat,
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| 46 | G4double a, G4double b, G4int n,
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| 47 | const G4String& processName) :
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| 48 | G4VXTRenergyLoss(anEnvelope,foilMat,gasMat,a,b,n,processName)
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| 49 | {
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| 50 | G4cout<<"Gammma distributed X-ray TR radiator model is called"<<G4endl ;
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| 51 |
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| 52 | // Build energy and angular integral spectra of X-ray TR photons from
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| 53 | // a radiator
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| 54 |
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| 55 | fAlphaPlate = alphaPlate ;
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| 56 | fAlphaGas = alphaGas ;
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| 57 | G4cout<<"fAlphaPlate = "<<fAlphaPlate<<" ; fAlphaGas = "<<fAlphaGas<<G4endl ;
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| 58 | fExitFlux = true;
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| 59 | // BuildTable() ;
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| 60 | }
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| 61 |
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| 62 | ///////////////////////////////////////////////////////////////////////////
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| 63 |
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| 64 | G4XTRGammaRadModel::~G4XTRGammaRadModel()
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| 65 | {
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| 66 | ;
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| 67 | }
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| 68 |
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| 69 |
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| 70 |
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| 71 | ///////////////////////////////////////////////////////////////////////////
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| 72 | //
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| 73 | // Rough approximation for radiator interference factor for the case of
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| 74 | // fully GamDistr radiator. The plate and gas gap thicknesses are distributed
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| 75 | // according to exponent. The mean values of the plate and gas gap thicknesses
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| 76 | // are supposed to be about XTR formation zones but much less than
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| 77 | // mean absorption length of XTR photons in coresponding material.
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| 78 |
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| 79 | G4double
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| 80 | G4XTRGammaRadModel::GetStackFactor( G4double energy,
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| 81 | G4double gamma, G4double varAngle )
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| 82 | {
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| 83 | G4double result, Qa, Qb, Q, Za, Zb, Ma, Mb ;
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| 84 |
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| 85 | Za = GetPlateFormationZone(energy,gamma,varAngle) ;
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| 86 | Zb = GetGasFormationZone(energy,gamma,varAngle) ;
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| 87 |
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| 88 | Ma = GetPlateLinearPhotoAbs(energy) ;
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| 89 | Mb = GetGasLinearPhotoAbs(energy) ;
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| 90 |
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| 91 | Qa = ( 1.0 + fPlateThick*Ma/fAlphaPlate ) ;
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| 92 | Qa = std::pow(Qa,-fAlphaPlate) ;
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| 93 | Qb = ( 1.0 + fGasThick*Mb/fAlphaGas ) ;
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| 94 | Qb = std::pow(Qb,-fAlphaGas) ;
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| 95 | Q = Qa*Qb ;
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| 96 |
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| 97 | G4complex Ca(1.0+0.5*fPlateThick*Ma/fAlphaPlate,fPlateThick/Za/fAlphaPlate) ;
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| 98 | G4complex Cb(1.0+0.5*fGasThick*Mb/fAlphaGas,fGasThick/Zb/fAlphaGas) ;
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| 99 |
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| 100 | G4complex Ha = std::pow(Ca,-fAlphaPlate) ;
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| 101 | G4complex Hb = std::pow(Cb,-fAlphaGas) ;
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| 102 | G4complex H = Ha*Hb ;
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| 103 |
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| 104 | G4complex F1 = ( 0.5*(1+Qa)*(1.0+H) - Ha - Qa*Hb )/(1.0-H) ;
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| 105 |
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| 106 | G4complex F2 = (1.0-Ha)*(Qa-Ha)*Hb/(1.0-H)/(Q-H) ;
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| 107 |
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| 108 | F2 *= std::pow(Q,G4double(fPlateNumber)) - std::pow(H,fPlateNumber) ;
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| 109 |
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| 110 | result = ( 1 - std::pow(Q,G4double(fPlateNumber)) )/( 1 - Q ) ;
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| 111 |
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| 112 | G4complex stack = result*F1;
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| 113 | stack += F2;
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| 114 | stack *= 2.0*OneInterfaceXTRdEdx(energy,gamma,varAngle);
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| 115 |
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| 116 | result = std::real(stack);
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| 117 |
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| 118 | // result *= 2.0*std::real(F1);
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| 119 | // result += 2.0*std::real(F2);
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| 120 |
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| 121 | return result ;
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| 122 | }
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| 123 |
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| 124 |
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| 125 | //
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| 126 | //
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| 127 | ////////////////////////////////////////////////////////////////////////////
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| 128 |
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| 129 |
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| 130 |
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| 131 |
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| 132 |
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| 133 |
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| 134 |
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| 135 |
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