[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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[1337] | 27 | // $Id: G4TransparentRegXTRadiator.cc,v 1.12 2010/06/16 15:34:15 gcosmo Exp $ |
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| 28 | // GEANT4 tag $Name: geant4-09-04-beta-01 $ |
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[819] | 29 | // |
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| 30 | |
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| 31 | #include <complex> |
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| 32 | |
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| 33 | #include "G4TransparentRegXTRadiator.hh" |
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| 34 | #include "Randomize.hh" |
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| 35 | #include "G4Integrator.hh" |
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| 36 | #include "G4Gamma.hh" |
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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 | G4TransparentRegXTRadiator::G4TransparentRegXTRadiator(G4LogicalVolume *anEnvelope, |
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| 43 | G4Material* foilMat,G4Material* gasMat, |
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| 44 | G4double a, G4double b, G4int n, |
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| 45 | const G4String& processName) : |
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| 46 | G4VXTRenergyLoss(anEnvelope,foilMat,gasMat,a,b,n,processName) |
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| 47 | { |
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| 48 | if(verboseLevel > 0) |
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| 49 | G4cout<<"Regular transparent X-ray TR radiator EM process is called"<<G4endl; |
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| 50 | |
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| 51 | // Build energy and angular integral spectra of X-ray TR photons from |
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| 52 | // a radiator |
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| 53 | |
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| 54 | fAlphaPlate = 10000; |
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| 55 | fAlphaGas = 1000; |
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| 56 | |
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| 57 | // BuildTable(); |
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| 58 | } |
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| 59 | |
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| 60 | /////////////////////////////////////////////////////////////////////////// |
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| 61 | |
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| 62 | G4TransparentRegXTRadiator::~G4TransparentRegXTRadiator() |
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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 | /////////////////////////////////////////////////////////////////////////// |
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| 68 | // |
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| 69 | // |
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| 70 | |
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| 71 | G4double G4TransparentRegXTRadiator::SpectralXTRdEdx(G4double energy) |
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| 72 | { |
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| 73 | G4double result, sum = 0., tmp, cof1, cof2, cofMin, cofPHC,aMa, bMb, sigma; |
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| 74 | G4int k, kMax, kMin; |
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| 75 | |
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| 76 | aMa = fPlateThick*GetPlateLinearPhotoAbs(energy); |
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| 77 | bMb = fGasThick*GetGasLinearPhotoAbs(energy); |
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| 78 | sigma = aMa + bMb; |
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| 79 | |
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| 80 | cofPHC = 4*pi*hbarc; |
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| 81 | tmp = (fSigma1 - fSigma2)/cofPHC/energy; |
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| 82 | cof1 = fPlateThick*tmp; |
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| 83 | cof2 = fGasThick*tmp; |
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| 84 | |
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| 85 | cofMin = energy*(fPlateThick + fGasThick)/fGamma/fGamma; |
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| 86 | cofMin += (fPlateThick*fSigma1 + fGasThick*fSigma2)/energy; |
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| 87 | cofMin /= cofPHC; |
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| 88 | |
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| 89 | // if (fGamma < 1200) kMin = G4int(cofMin); // 1200 ? |
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| 90 | // else kMin = 1; |
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| 91 | |
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| 92 | |
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| 93 | kMin = G4int(cofMin); |
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| 94 | if (cofMin > kMin) kMin++; |
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| 95 | |
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| 96 | // tmp = (fPlateThick + fGasThick)*energy*fMaxThetaTR; |
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| 97 | // tmp /= cofPHC; |
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| 98 | // kMax = G4int(tmp); |
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| 99 | // if(kMax < 0) kMax = 0; |
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| 100 | // kMax += kMin; |
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| 101 | |
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| 102 | |
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| 103 | kMax = kMin + 19; // 9; // kMin + G4int(tmp); |
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| 104 | |
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| 105 | // tmp /= fGamma; |
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| 106 | // if( G4int(tmp) < kMin ) kMin = G4int(tmp); |
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| 107 | // G4cout<<"kMin = "<<kMin<<"; kMax = "<<kMax<<G4endl; |
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| 108 | |
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| 109 | for( k = kMin; k <= kMax; k++ ) |
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| 110 | { |
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| 111 | tmp = pi*fPlateThick*(k + cof2)/(fPlateThick + fGasThick); |
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| 112 | result = (k - cof1)*(k - cof1)*(k + cof2)*(k + cof2); |
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[1337] | 113 | // tmp = std::sin(tmp)*std::sin(tmp)*std::abs(k-cofMin)/result; |
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[819] | 114 | if( k == kMin && kMin == G4int(cofMin) ) |
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| 115 | { |
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[1337] | 116 | sum += 0.5*std::sin(tmp)*std::sin(tmp)*std::abs(k-cofMin)/result; |
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[819] | 117 | } |
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| 118 | else |
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| 119 | { |
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[1337] | 120 | sum += std::sin(tmp)*std::sin(tmp)*std::abs(k-cofMin)/result; |
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[819] | 121 | } |
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| 122 | if(verboseLevel > 2) |
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| 123 | { |
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[1337] | 124 | G4cout<<"k = "<<k<<"; tmp = "<<std::sin(tmp)*std::sin(tmp)*std::abs(k-cofMin)/result |
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[819] | 125 | <<"; sum = "<<sum<<G4endl; |
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| 126 | } |
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| 127 | } |
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| 128 | result = 4*( cof1 + cof2 )*( cof1 + cof2 )*sum/energy; |
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[1337] | 129 | // result *= ( 1 - std::exp(-0.5*fPlateNumber*sigma) )/( 1 - std::exp(-0.5*sigma) ); |
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[819] | 130 | // fPlateNumber; |
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[1337] | 131 | result *= fPlateNumber; // *std::exp(-0.5*fPlateNumber*sigma); |
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| 132 | // +1-std::exp(-0.5*fPlateNumber*sigma); |
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[819] | 133 | /* |
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| 134 | fEnergy = energy; |
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| 135 | // G4Integrator<G4VXTRenergyLoss,G4double(G4VXTRenergyLoss::*)(G4double)> integral; |
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| 136 | G4Integrator<G4TransparentRegXTRadiator,G4double(G4VXTRenergyLoss::*)(G4double)> integral; |
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| 137 | |
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| 138 | tmp = integral.Legendre96(this,&G4VXTRenergyLoss::SpectralAngleXTRdEdx, |
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| 139 | 0.0,0.3*fMaxThetaTR) + |
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| 140 | integral.Legendre96(this,&G4VXTRenergyLoss::SpectralAngleXTRdEdx, |
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| 141 | 0.3*fMaxThetaTR,0.6*fMaxThetaTR) + |
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| 142 | integral.Legendre96(this,&G4VXTRenergyLoss::SpectralAngleXTRdEdx, |
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| 143 | 0.6*fMaxThetaTR,fMaxThetaTR) ; |
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| 144 | result += tmp; |
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| 145 | */ |
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| 146 | return result; |
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| 147 | } |
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| 148 | |
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| 149 | |
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| 150 | /////////////////////////////////////////////////////////////////////////// |
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| 151 | // |
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| 152 | // Approximation for radiator interference factor for the case of |
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| 153 | // fully Regular radiator. The plate and gas gap thicknesses are fixed . |
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| 154 | // The mean values of the plate and gas gap thicknesses |
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| 155 | // are supposed to be about XTR formation zones but much less than |
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| 156 | // mean absorption length of XTR photons in coresponding material. |
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| 157 | |
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| 158 | G4double |
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| 159 | G4TransparentRegXTRadiator::GetStackFactor( G4double energy, |
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| 160 | G4double gamma, G4double varAngle ) |
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| 161 | { |
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| 162 | /* |
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| 163 | G4double result, Za, Zb, Ma, Mb, sigma; |
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| 164 | |
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| 165 | Za = GetPlateFormationZone(energy,gamma,varAngle); |
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| 166 | Zb = GetGasFormationZone(energy,gamma,varAngle); |
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| 167 | Ma = GetPlateLinearPhotoAbs(energy); |
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| 168 | Mb = GetGasLinearPhotoAbs(energy); |
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| 169 | sigma = Ma*fPlateThick + Mb*fGasThick; |
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| 170 | |
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| 171 | G4complex Ca(1.0+0.5*fPlateThick*Ma/fAlphaPlate,fPlateThick/Za/fAlphaPlate); |
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| 172 | G4complex Cb(1.0+0.5*fGasThick*Mb/fAlphaGas,fGasThick/Zb/fAlphaGas); |
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| 173 | |
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[1337] | 174 | G4complex Ha = std::pow(Ca,-fAlphaPlate); |
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| 175 | G4complex Hb = std::pow(Cb,-fAlphaGas); |
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[819] | 176 | G4complex H = Ha*Hb; |
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| 177 | G4complex F1 = (1.0 - Ha)*(1.0 - Hb )/(1.0 - H) |
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| 178 | * G4double(fPlateNumber) ; |
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| 179 | G4complex F2 = (1.0-Ha)*(1.0-Ha)*Hb/(1.0-H)/(1.0-H) |
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[1337] | 180 | * (1.0 - std::exp(-0.5*fPlateNumber*sigma)) ; |
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| 181 | // *(1.0 - std::pow(H,fPlateNumber)) ; |
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[819] | 182 | G4complex R = (F1 + F2)*OneInterfaceXTRdEdx(energy,gamma,varAngle); |
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| 183 | // G4complex R = F2*OneInterfaceXTRdEdx(energy,gamma,varAngle); |
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[1337] | 184 | result = 2.0*std::real(R); |
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[819] | 185 | return result; |
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| 186 | */ |
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| 187 | // numerically unstable result |
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| 188 | |
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| 189 | G4double result, Qa, Qb, Q, aZa, bZb, aMa, bMb, D, sigma; |
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| 190 | |
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| 191 | aZa = fPlateThick/GetPlateFormationZone(energy,gamma,varAngle); |
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| 192 | bZb = fGasThick/GetGasFormationZone(energy,gamma,varAngle); |
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| 193 | aMa = fPlateThick*GetPlateLinearPhotoAbs(energy); |
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| 194 | bMb = fGasThick*GetGasLinearPhotoAbs(energy); |
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| 195 | sigma = aMa*fPlateThick + bMb*fGasThick; |
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[1337] | 196 | Qa = std::exp(-0.5*aMa); |
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| 197 | Qb = std::exp(-0.5*bMb); |
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[819] | 198 | Q = Qa*Qb; |
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| 199 | |
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[1337] | 200 | G4complex Ha( Qa*std::cos(aZa), -Qa*std::sin(aZa) ); |
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| 201 | G4complex Hb( Qb*std::cos(bZb), -Qb*std::sin(bZb) ); |
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[819] | 202 | G4complex H = Ha*Hb; |
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| 203 | G4complex Hs = conj(H); |
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| 204 | D = 1.0 /( (1 - Q)*(1 - Q) + |
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[1337] | 205 | 4*Q*std::sin(0.5*(aZa + bZb))*std::sin(0.5*(aZa + bZb)) ); |
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[819] | 206 | G4complex F1 = (1.0 - Ha)*(1.0 - Hb)*(1.0 - Hs) |
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| 207 | * G4double(fPlateNumber)*D; |
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| 208 | G4complex F2 = (1.0 - Ha)*(1.0 - Ha)*Hb*(1.0 - Hs)*(1.0 - Hs) |
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[1337] | 209 | // * (1.0 - std::pow(H,fPlateNumber)) * D*D; |
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| 210 | * (1.0 - std::exp(-0.5*fPlateNumber*sigma)) * D*D; |
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[819] | 211 | G4complex R = (F1 + F2)*OneInterfaceXTRdEdx(energy,gamma,varAngle); |
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[1337] | 212 | result = 2.0*std::real(R); |
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[819] | 213 | return result; |
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| 214 | |
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| 215 | } |
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| 216 | |
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| 217 | |
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| 218 | // |
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| 219 | // |
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| 220 | //////////////////////////////////////////////////////////////////////////// |
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| 221 | |
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