[819] | 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 | #include <complex> |
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| 29 | |
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| 30 | #include "G4XTRRegularRadModel.hh" |
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| 31 | #include "Randomize.hh" |
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| 32 | |
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| 33 | #include "G4Gamma.hh" |
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| 34 | using namespace std; |
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| 35 | |
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| 36 | //////////////////////////////////////////////////////////////////////////// |
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| 37 | // |
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| 38 | // Constructor, destructor |
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| 39 | |
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| 40 | G4XTRRegularRadModel::G4XTRRegularRadModel(G4LogicalVolume *anEnvelope, |
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| 41 | G4Material* foilMat,G4Material* gasMat, |
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| 42 | G4double a, G4double b, G4int n, |
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| 43 | const G4String& processName) : |
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| 44 | G4VXTRenergyLoss(anEnvelope,foilMat,gasMat,a,b,n,processName) |
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| 45 | { |
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| 46 | G4cout<<" XTR Regular discrete radiator model is called"<<G4endl ; |
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| 47 | |
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| 48 | fExitFlux = true; |
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| 49 | |
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| 50 | // Build energy and angular integral spectra of X-ray TR photons from |
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| 51 | // a radiator |
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| 52 | |
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| 53 | // BuildTable() ; |
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| 54 | } |
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| 55 | |
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| 56 | /////////////////////////////////////////////////////////////////////////// |
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| 57 | |
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| 58 | G4XTRRegularRadModel::~G4XTRRegularRadModel() |
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| 59 | { |
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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 | |
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| 65 | /////////////////////////////////////////////////////////////////////////// |
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| 66 | // |
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| 67 | // Approximation for radiator interference factor for the case of |
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| 68 | // fully Regular radiator. The plate and gas gap thicknesses are fixed . |
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| 69 | // The mean values of the plate and gas gap thicknesses |
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| 70 | // are supposed to be about XTR formation zones but much less than |
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| 71 | // mean absorption length of XTR photons in coresponding material. |
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| 72 | |
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| 73 | G4double |
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| 74 | G4XTRRegularRadModel::GetStackFactor( G4double energy, |
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| 75 | G4double gamma, G4double varAngle ) |
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| 76 | { |
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| 77 | G4double result, Qa, Qb, Q, aZa, bZb, aMa, bMb, I2 ; |
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| 78 | |
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| 79 | aZa = fPlateThick/GetPlateFormationZone(energy,gamma,varAngle) ; |
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| 80 | bZb = fGasThick/GetGasFormationZone(energy,gamma,varAngle) ; |
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| 81 | |
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| 82 | aMa = fPlateThick*GetPlateLinearPhotoAbs(energy) ; |
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| 83 | bMb = fGasThick*GetGasLinearPhotoAbs(energy) ; |
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| 84 | |
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| 85 | Qa = std::exp(-aMa) ; |
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| 86 | Qb = std::exp(-bMb) ; |
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| 87 | Q = Qa*Qb ; |
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| 88 | |
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| 89 | // G4complex Ca(1.0+0.5*fPlateThick*Ma,fPlateThick/Za) ; |
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| 90 | // G4complex Cb(1.0+0.5*fGasThick*Mb,fGasThick/Zb) ; |
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| 91 | |
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| 92 | G4complex Ha( std::exp(-0.5*aMa)*std::cos(aZa), |
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| 93 | -std::exp(-0.5*aMa)*std::sin(aZa) ) ; |
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| 94 | |
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| 95 | G4complex Hb( std::exp(-0.5*bMb)*std::cos(bZb), |
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| 96 | -std::exp(-0.5*bMb)*std::sin(bZb) ) ; |
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| 97 | |
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| 98 | G4complex H = Ha*Hb ; |
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| 99 | |
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| 100 | G4complex Hs = std::conj(H) ; |
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| 101 | |
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| 102 | // G4complex F1 = ( 0.5*(1+Qa)*(1+H) - Ha - Qa*Hb )/(1-H) ; |
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| 103 | |
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| 104 | G4complex F2 = (1.0-Ha)*(Qa-Ha)*Hb*(1.0-Hs)*(Q-Hs) ; |
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| 105 | |
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| 106 | F2 *= std::pow(Q,G4double(fPlateNumber)) - std::pow(H,fPlateNumber) ; |
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| 107 | |
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| 108 | result = ( 1 - std::pow(Q,G4double(fPlateNumber)) )/( 1 - Q ) ; |
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| 109 | |
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| 110 | result *= (1 - Qa)*(1 + Qa - 2*std::sqrt(Qa)*std::cos(aZa)) ; |
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| 111 | |
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| 112 | result /= (1 - std::sqrt(Q))*(1 - std::sqrt(Q)) + |
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| 113 | 4*std::sqrt(Q)*std::sin(0.5*(aZa+bZb))*std::sin(0.5*(aZa+bZb)) ; |
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| 114 | |
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| 115 | I2 = 1.; // 2.0*std::real(F2) ; |
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| 116 | |
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| 117 | I2 /= (1 - std::sqrt(Q))*(1 - std::sqrt(Q)) + |
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| 118 | 4*std::sqrt(Q)*std::sin(0.5*(aZa+bZb))*std::sin(0.5*(aZa+bZb)) ; |
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| 119 | |
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| 120 | I2 /= Q*( (std::sqrt(Q)-std::cos(aZa+bZb))*(std::sqrt(Q)-std::cos(aZa+bZb)) + |
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| 121 | std::sin(aZa+bZb)*std::sin(aZa+bZb) ) ; |
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| 122 | |
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| 123 | G4complex stack = 2.*I2*F2; |
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| 124 | stack += result; |
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| 125 | stack *= OneInterfaceXTRdEdx(energy,gamma,varAngle); |
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| 126 | |
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| 127 | // result += I2 ; |
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| 128 | result = std::real(stack); |
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| 129 | |
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| 130 | return result ; |
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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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| 136 | //////////////////////////////////////////////////////////////////////////// |
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| 137 | |
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