[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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[961] | 26 | // $Id: G4PenelopeBremsstrahlungContinuous.cc,v 1.11 2008/12/15 09:23:06 pandola Exp $ |
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| 27 | // GEANT4 tag $Name: geant4-09-02-ref-02 $ |
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[819] | 28 | // |
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| 29 | // -------------------------------------------------------------- |
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| 30 | // |
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| 31 | // File name: G4PenelopeBremsstrahlungContinuous |
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| 32 | // |
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| 33 | // Author: Luciano Pandola |
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| 34 | // |
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| 35 | // Creation date: February 2003 |
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| 36 | // History: |
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| 37 | // ----------- |
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| 38 | // 20 Feb 2003 L. Pandola 1st implementation |
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| 39 | // 17 Mar 2003 L. Pandola Added the correction for positrons |
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| 40 | // 19 Mar 2003 L. Pandola Bugs fixed |
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| 41 | // 17 Mar 2004 L. Pandola Removed unnecessary calls to std::pow(a,b) |
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[961] | 42 | // 09 Dec 2008 L. Pandola Update ReadFile() in a way to make explicit use of the units of |
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| 43 | // measurement. Also some cosmetics to improve readibility. |
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[819] | 44 | //---------------------------------------------------------------- |
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| 45 | |
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| 46 | #include "G4PenelopeBremsstrahlungContinuous.hh" |
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| 47 | #include "G4PenelopeInterpolator.hh" |
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| 48 | #include "G4Electron.hh" |
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| 49 | #include "G4Positron.hh" |
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| 50 | #include "Randomize.hh" |
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| 51 | #include "G4ParticleDefinition.hh" |
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| 52 | #include "globals.hh" |
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| 53 | #include <sstream> |
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| 54 | |
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[961] | 55 | G4PenelopeBremsstrahlungContinuous::G4PenelopeBremsstrahlungContinuous (G4int Zed,G4double cut, |
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| 56 | G4double e1, |
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[819] | 57 | G4double e2, |
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| 58 | const G4String name) : |
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[961] | 59 | Zmat(Zed),tCut(cut),MinE(e1),MaxE(e2),partName(name) |
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[819] | 60 | { |
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| 61 | //Construct extended energy table |
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| 62 | //200 bins between MinE and MaxE (logarithmic) |
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| 63 | G4double EL=0.99999*MinE; |
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| 64 | G4double EU=1.00001*MaxE; |
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| 65 | DLFC=std::log(EU/EL)/((G4double) (NumberofExtendedEGrid-1)); |
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| 66 | ExtendedLogEnergy[0]=std::log(EL); |
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| 67 | for (size_t i=1;i<NumberofExtendedEGrid;i++){ |
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| 68 | ExtendedLogEnergy[i]=ExtendedLogEnergy[i-1]+DLFC; |
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| 69 | } |
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| 70 | DLFC=1.0/DLFC; |
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| 71 | |
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| 72 | LoadFromFile(); |
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| 73 | PrepareInterpolationTable(); |
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| 74 | } |
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| 75 | |
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[961] | 76 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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[819] | 77 | |
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| 78 | G4PenelopeBremsstrahlungContinuous::~G4PenelopeBremsstrahlungContinuous() |
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[961] | 79 | {;} |
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[819] | 80 | |
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[961] | 81 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 82 | |
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[819] | 83 | void G4PenelopeBremsstrahlungContinuous::LoadFromFile() |
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| 84 | { |
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| 85 | //Read information from DataBase File |
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| 86 | char* path = getenv("G4LEDATA"); |
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| 87 | if (!path) |
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| 88 | { |
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| 89 | G4String excep = "G4PenelopeBremsstrahlungContinuous - G4LEDATA environment variable not set!"; |
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| 90 | G4Exception(excep); |
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| 91 | } |
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| 92 | G4String pathString(path); |
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| 93 | G4String filename = "br-pen-cont-"; |
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| 94 | std::ostringstream ost; |
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| 95 | ost << filename << Zmat << ".dat"; |
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| 96 | G4String name(ost.str()); |
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| 97 | G4String dirFile = pathString + "/penelope/" + name; |
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| 98 | std::ifstream file(dirFile); |
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[961] | 99 | if (!file.is_open()) |
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[819] | 100 | { |
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| 101 | G4String excep = "G4PenelopeBremsstrahlungContinuous - data file " + name + " not found!"; |
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| 102 | G4Exception(excep); |
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| 103 | } |
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[961] | 104 | G4double a1 = -1.; |
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| 105 | for (size_t i=0;i<NumberofEPoints;i++) |
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| 106 | { |
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[819] | 107 | file >> a1; |
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[961] | 108 | //1) reads energy in MeV |
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| 109 | Energies[i]=a1*MeV; |
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| 110 | //2) read 32 cross sections in cm2 |
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| 111 | for (size_t j=0;j<NumberofKPoints;j++){ |
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| 112 | file >> a1; |
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| 113 | ReducedCS[i][j]=a1*cm2; |
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| 114 | } |
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| 115 | //3) read the total cross section, in cm2 |
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| 116 | file >> a1; |
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| 117 | TotalCS[i]=a1*cm2; |
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| 118 | // Check closing item |
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| 119 | file >> a1; |
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| 120 | if (a1 != ((G4double) -1)) |
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| 121 | { |
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| 122 | G4String excep = "G4PenelopeBremsstrahlungContinuous - Check the bremms data file " |
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| 123 | + name; |
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| 124 | G4Exception(excep); |
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| 125 | } |
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[819] | 126 | } |
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| 127 | file.close(); |
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| 128 | } |
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| 129 | |
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[961] | 130 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 131 | |
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[819] | 132 | void G4PenelopeBremsstrahlungContinuous::PrepareInterpolationTable() |
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| 133 | { |
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| 134 | //The energy-loss spectrum is re-normalized to reproduce the |
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| 135 | //total scaled cross-section of Berger and Seltzer |
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| 136 | |
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| 137 | G4double pK[NumberofKPoints] = {1.0e-12,0.05,0.075,0.1,0.125,0.15,0.2,0.25, |
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| 138 | 0.3,0.35,0.4,0.45,0.5,0.55,0.6,0.65,0.7, |
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| 139 | 0.75,0.8,0.85,0.9,0.925,0.95,0.97,0.99, |
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| 140 | 0.995,0.999,0.9995,0.9999,0.99995,0.99999,1.0}; |
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| 141 | G4double pY[NumberofKPoints]; |
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| 142 | |
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| 143 | size_t i=0,j=0; |
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| 144 | for (i=0;i<NumberofEPoints;i++){ |
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| 145 | for (j=0;j<NumberofKPoints;j++){ |
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| 146 | pY[j]= ReducedCS[i][j]; |
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| 147 | } |
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| 148 | G4PenelopeInterpolator* interpolator = new G4PenelopeInterpolator(pK,pY,NumberofKPoints); |
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| 149 | G4double Rsum = interpolator->CalculateMomentum(1.0,0); |
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| 150 | |
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| 151 | delete interpolator; |
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[961] | 152 | G4double Fact = (Energies[i]+electron_mass_c2)*(1.0/fine_structure_const)*millibarn/ |
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[819] | 153 | (classic_electr_radius*classic_electr_radius*(Energies[i]+2.0*electron_mass_c2)); |
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| 154 | G4double Normalization = TotalCS[i]/(Rsum*Fact); |
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[961] | 155 | G4double TST = std::abs(Normalization-1.0); |
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[819] | 156 | if (TST > 1.0) { |
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| 157 | G4String excep = "G4PenelopeBremsstrahlungContinuous - Check the bremms data file"; |
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| 158 | G4Exception(excep); |
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| 159 | } |
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| 160 | for (j=0;j<NumberofKPoints;j++){ |
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| 161 | ReducedCS[i][j] = ReducedCS[i][j]*Normalization; |
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| 162 | } |
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| 163 | } |
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| 164 | |
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| 165 | //Compute the scaled energy loss distribution and sampling parameters |
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| 166 | // for the energies in the simulation grid |
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| 167 | |
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| 168 | // Interpolation in E |
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| 169 | G4double pX[NumberofEPoints]; |
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| 170 | G4double pYY[NumberofEPoints]; |
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| 171 | for (i=0;i<NumberofEPoints;i++){ |
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| 172 | pX[i] = std::log(Energies[i]); |
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| 173 | } |
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| 174 | |
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| 175 | for (j=0;j<NumberofKPoints;j++){ |
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| 176 | for (i=0;i<NumberofEPoints;i++){ |
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| 177 | pYY[i] = std::log(ReducedCS[i][j]); |
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| 178 | } |
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| 179 | G4PenelopeInterpolator* interpolator2 = new G4PenelopeInterpolator(pX,pYY,NumberofEPoints); |
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| 180 | for (i=0;i<NumberofExtendedEGrid;i++){ |
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| 181 | G4double ELL = ExtendedLogEnergy[i]; |
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| 182 | if (ELL >= pX[0]) { |
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| 183 | p0[i][j] = std::exp(interpolator2->CubicSplineInterpolation(ELL)); |
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| 184 | } |
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| 185 | else |
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| 186 | { |
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| 187 | G4double F1=interpolator2->CubicSplineInterpolation(pX[0]); |
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| 188 | G4double FP1 = interpolator2->FirstDerivative(pX[0]); |
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| 189 | p0[i][j] = std::exp(F1+FP1*(ELL-pX[0])); |
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| 190 | } |
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| 191 | } |
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| 192 | delete interpolator2; |
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| 193 | } |
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| 194 | |
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[961] | 195 | //All this stuff might be useful later on |
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| 196 | /* |
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| 197 | G4double PDF[NumberofKPoints]; |
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[819] | 198 | |
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[961] | 199 | for (i=0;i<NumberofExtendedEGrid;i++){ |
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| 200 | for (j=0;j<NumberofKPoints;j++){ |
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| 201 | PDF[j]=p0[i][j]; |
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| 202 | } |
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| 203 | G4double Xc=0; |
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| 204 | if (i<(NumberofExtendedEGrid-1)){ |
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| 205 | Xc=tCut/std::exp(ExtendedLogEnergy[i+1]); |
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| 206 | } |
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| 207 | else |
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| 208 | { |
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| 209 | Xc=tCut/std::exp(ExtendedLogEnergy[NumberofExtendedEGrid-1]); |
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| 210 | } |
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[819] | 211 | |
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[961] | 212 | G4PenelopeInterpolator* interpolator3 = new G4PenelopeInterpolator(pK,PDF,NumberofKPoints); |
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| 213 | Pbcut[i]=interpolator3->CalculateMomentum(Xc,-1); |
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| 214 | delete interpolator3; |
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| 215 | } |
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| 216 | */ |
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[819] | 217 | |
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| 218 | } |
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[961] | 219 | |
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| 220 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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[819] | 221 | |
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[961] | 222 | G4double G4PenelopeBremsstrahlungContinuous::CalculateStopping(G4double energy) |
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[819] | 223 | //Stopping power expressed in MeV/mm*2 |
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| 224 | { |
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[961] | 225 | G4double Xel=std::max(std::log(energy),ExtendedLogEnergy[0]); |
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[819] | 226 | G4double Xe=1.0+(Xel-ExtendedLogEnergy[0])*DLFC; |
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| 227 | G4int Ke = (G4int) Xe; |
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| 228 | G4double Xek = Xe-Ke; |
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| 229 | |
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| 230 | //Global x-section factor |
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[961] | 231 | G4double Fact=Zmat*Zmat*(energy+electron_mass_c2)*(energy+electron_mass_c2)/ |
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| 232 | (energy*(energy+2.0*electron_mass_c2)); |
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| 233 | Fact *= PositronCorrection(energy); |
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[819] | 234 | |
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| 235 | //Moments of the scaled bremss x-section |
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[961] | 236 | G4double wcre = tCut/energy; |
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[819] | 237 | G4double pY[NumberofKPoints]; |
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| 238 | G4double pK[NumberofKPoints] = {1.0e-12,0.05,0.075,0.1,0.125,0.15,0.2,0.25, |
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| 239 | 0.3,0.35,0.4,0.45,0.5,0.55,0.6,0.65,0.7, |
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| 240 | 0.75,0.8,0.85,0.9,0.925,0.95,0.97,0.99, |
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| 241 | 0.995,0.999,0.9995,0.9999,0.99995,0.99999,1.0}; |
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| 242 | |
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| 243 | for (size_t i=0;i<NumberofKPoints;i++){ |
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| 244 | pY[i] = p0[Ke][i]; |
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| 245 | } |
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| 246 | G4PenelopeInterpolator* interpolator1 = new G4PenelopeInterpolator(pK,pY,NumberofKPoints); |
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| 247 | G4double XS1A = interpolator1->CalculateMomentum(wcre,0); |
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| 248 | for (size_t k=0;k<NumberofKPoints;k++){ |
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| 249 | pY[k] = p0[std::min(Ke+1,(G4int) NumberofExtendedEGrid-1)][k]; |
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| 250 | } |
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| 251 | G4PenelopeInterpolator* interpolator2 = new G4PenelopeInterpolator (pK,pY,NumberofKPoints); |
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| 252 | G4double XS1B = interpolator2->CalculateMomentum(wcre,0); |
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| 253 | |
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[961] | 254 | G4double XS1 = ((1.0-Xek)*XS1A+Xek*XS1B)*Fact*energy; //weighted mean between the energy bin of the grid |
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[819] | 255 | |
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[961] | 256 | //This is the 2nd momentum (straggling cross section). It might be useful later on |
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| 257 | /* |
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| 258 | G4double XS2A = interpolator1->CalculateMomentum(wcre,1); |
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| 259 | G4double XS2 = ((1.0-Xek)*XS2A+Xek*XS2B)*Fact*energy*energy; |
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| 260 | G4double XS2B = interpolator2->CalculateMomentum(wcre,1); |
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| 261 | */ |
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[819] | 262 | |
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[961] | 263 | delete interpolator1; |
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| 264 | delete interpolator2; |
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| 265 | |
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[819] | 266 | return XS1; |
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| 267 | } |
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| 268 | |
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[961] | 269 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
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| 270 | |
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| 271 | G4double G4PenelopeBremsstrahlungContinuous::PositronCorrection(G4double energy) |
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[819] | 272 | { |
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| 273 | const G4double Coeff[7]={-1.2359e-01,6.1274e-2,-3.1516e-2,7.7446e-3,-1.0595e-3, |
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| 274 | 7.0568e-5,-1.8080e-6}; |
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| 275 | G4double correct=0; |
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| 276 | if (partName == "e-") { |
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| 277 | return 1.0; //no correction for electrons |
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| 278 | } |
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| 279 | else if (partName == "e+"){ |
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[961] | 280 | G4double T=std::log(1+((1e6*energy)/(Zmat*Zmat*electron_mass_c2))); |
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[819] | 281 | for (G4int i=0;i<7;i++){ |
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| 282 | correct += Coeff[i]*std::pow(T,i+1); |
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| 283 | } |
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| 284 | correct = 1.0-std::exp(correct); |
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| 285 | return correct; |
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| 286 | } |
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[961] | 287 | else //neither electrons nor positrons...exception |
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[819] | 288 | { |
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| 289 | G4String excep = "G4PenelopeBremmstrahlungContinuous: the particle is not e- nor e+!"; |
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| 290 | G4Exception(excep); |
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| 291 | return 0; |
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| 292 | } |
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| 293 | } |
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