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 | // $Id: G4VeLowEnergyLoss.cc,v 1.25 2006/06/29 19:41:50 gunter Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-02 $ |
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29 | // |
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30 | // |
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31 | // -------------------------------------------------------------- |
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32 | // GEANT 4 class implementation file |
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33 | // |
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34 | // History: first implementation, based on object model of |
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35 | // 2nd December 1995, G.Cosmo |
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36 | // -------------------------------------------------------------- |
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37 | // |
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38 | // Modifications: |
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39 | // 20/09/00 update fluctuations V.Ivanchenko |
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40 | // 22/11/00 minor fix in fluctuations V.Ivanchenko |
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41 | // 10/05/01 V.Ivanchenko Clean up againist Linux compilation with -Wall |
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42 | // 22/05/01 V.Ivanchenko Update range calculation |
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43 | // 23/11/01 V.Ivanchenko Move static member-functions from header to source |
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44 | // 22/01/03 V.Ivanchenko Cut per region |
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45 | // 11/02/03 V.Ivanchenko Add limits to fluctuations |
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46 | // 24/04/03 V.Ivanchenko Fix the problem of table size |
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47 | // |
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48 | // -------------------------------------------------------------- |
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49 | |
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50 | #include "G4VeLowEnergyLoss.hh" |
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51 | #include "G4ProductionCutsTable.hh" |
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52 | |
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53 | G4double G4VeLowEnergyLoss::ParticleMass ; |
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54 | G4double G4VeLowEnergyLoss::taulow ; |
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55 | G4double G4VeLowEnergyLoss::tauhigh ; |
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56 | G4double G4VeLowEnergyLoss::ltaulow ; |
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57 | G4double G4VeLowEnergyLoss::ltauhigh ; |
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58 | |
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59 | |
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60 | G4bool G4VeLowEnergyLoss::rndmStepFlag = false; |
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61 | G4bool G4VeLowEnergyLoss::EnlossFlucFlag = true; |
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62 | G4double G4VeLowEnergyLoss::dRoverRange = 20*perCent; |
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63 | G4double G4VeLowEnergyLoss::finalRange = 200*micrometer; |
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64 | G4double G4VeLowEnergyLoss::c1lim = dRoverRange ; |
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65 | G4double G4VeLowEnergyLoss::c2lim = 2.*(1.-dRoverRange)*finalRange ; |
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66 | G4double G4VeLowEnergyLoss::c3lim = -(1.-dRoverRange)*finalRange*finalRange; |
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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 | G4VeLowEnergyLoss::G4VeLowEnergyLoss() |
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72 | :G4VContinuousDiscreteProcess("No Name Loss Process"), |
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73 | lastMaterial(0), |
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74 | nmaxCont1(4), |
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75 | nmaxCont2(16) |
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76 | { |
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77 | G4Exception("G4VeLowEnergyLoss:: default constructor is called"); |
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78 | } |
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79 | |
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80 | // |
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81 | |
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82 | G4VeLowEnergyLoss::G4VeLowEnergyLoss(const G4String& aName, G4ProcessType aType) |
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83 | : G4VContinuousDiscreteProcess(aName, aType), |
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84 | lastMaterial(0), |
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85 | nmaxCont1(4), |
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86 | nmaxCont2(16) |
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87 | { |
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88 | } |
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89 | |
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90 | // |
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91 | |
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92 | G4VeLowEnergyLoss::~G4VeLowEnergyLoss() |
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93 | { |
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94 | } |
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95 | |
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96 | // |
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97 | |
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98 | G4VeLowEnergyLoss::G4VeLowEnergyLoss(G4VeLowEnergyLoss& right) |
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99 | : G4VContinuousDiscreteProcess(right), |
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100 | lastMaterial(0), |
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101 | nmaxCont1(4), |
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102 | nmaxCont2(16) |
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103 | { |
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104 | } |
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105 | |
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106 | void G4VeLowEnergyLoss::SetRndmStep(G4bool value) |
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107 | { |
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108 | rndmStepFlag = value; |
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109 | } |
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110 | |
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111 | void G4VeLowEnergyLoss::SetEnlossFluc(G4bool value) |
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112 | { |
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113 | EnlossFlucFlag = value; |
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114 | } |
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115 | |
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116 | void G4VeLowEnergyLoss::SetStepFunction (G4double c1, G4double c2) |
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117 | { |
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118 | dRoverRange = c1; |
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119 | finalRange = c2; |
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120 | c1lim=dRoverRange; |
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121 | c2lim=2.*(1-dRoverRange)*finalRange; |
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122 | c3lim=-(1.-dRoverRange)*finalRange*finalRange; |
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123 | } |
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124 | |
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125 | G4PhysicsTable* G4VeLowEnergyLoss::BuildRangeTable(G4PhysicsTable* theDEDXTable, |
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126 | G4PhysicsTable* theRangeTable, |
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127 | G4double lowestKineticEnergy, |
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128 | G4double highestKineticEnergy, |
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129 | G4int TotBin) |
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130 | // Build range table from the energy loss table |
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131 | { |
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132 | |
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133 | G4int numOfCouples = theDEDXTable->length(); |
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134 | |
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135 | if(theRangeTable) |
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136 | { theRangeTable->clearAndDestroy(); |
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137 | delete theRangeTable; } |
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138 | theRangeTable = new G4PhysicsTable(numOfCouples); |
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139 | |
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140 | // loop for materials |
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141 | |
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142 | for (G4int J=0; J<numOfCouples; J++) |
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143 | { |
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144 | G4PhysicsLogVector* aVector; |
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145 | aVector = new G4PhysicsLogVector(lowestKineticEnergy, |
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146 | highestKineticEnergy,TotBin); |
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147 | BuildRangeVector(theDEDXTable,lowestKineticEnergy,highestKineticEnergy, |
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148 | TotBin,J,aVector); |
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149 | theRangeTable->insert(aVector); |
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150 | } |
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151 | return theRangeTable ; |
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152 | } |
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153 | |
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154 | // |
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155 | |
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156 | void G4VeLowEnergyLoss::BuildRangeVector(G4PhysicsTable* theDEDXTable, |
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157 | G4double lowestKineticEnergy, |
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158 | G4double, |
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159 | G4int TotBin, |
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160 | G4int materialIndex, |
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161 | G4PhysicsLogVector* rangeVector) |
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162 | |
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163 | // create range vector for a material |
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164 | { |
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165 | G4bool isOut; |
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166 | G4PhysicsVector* physicsVector= (*theDEDXTable)[materialIndex]; |
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167 | G4double energy1 = lowestKineticEnergy; |
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168 | G4double dedx = physicsVector->GetValue(energy1,isOut); |
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169 | G4double range = 0.5*energy1/dedx; |
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170 | rangeVector->PutValue(0,range); |
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171 | G4int n = 100; |
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172 | G4double del = 1.0/(G4double)n ; |
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173 | |
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174 | for (G4int j=1; j<TotBin; j++) { |
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175 | |
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176 | G4double energy2 = rangeVector->GetLowEdgeEnergy(j); |
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177 | G4double de = (energy2 - energy1) * del ; |
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178 | G4double dedx1 = dedx ; |
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179 | |
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180 | for (G4int i=1; i<n; i++) { |
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181 | G4double energy = energy1 + i*de ; |
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182 | G4double dedx2 = physicsVector->GetValue(energy,isOut); |
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183 | range += 0.5*de*(1.0/dedx1 + 1.0/dedx2); |
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184 | dedx1 = dedx2; |
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185 | } |
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186 | rangeVector->PutValue(j,range); |
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187 | dedx = dedx1 ; |
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188 | energy1 = energy2 ; |
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189 | } |
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190 | } |
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191 | |
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192 | // |
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193 | |
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194 | G4double G4VeLowEnergyLoss::RangeIntLin(G4PhysicsVector* physicsVector, |
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195 | G4int nbin) |
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196 | // num. integration, linear binning |
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197 | { |
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198 | G4double dtau,Value,taui,ti,lossi,ci; |
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199 | G4bool isOut; |
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200 | dtau = (tauhigh-taulow)/nbin; |
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201 | Value = 0.; |
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202 | |
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203 | for (G4int i=0; i<=nbin; i++) |
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204 | { |
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205 | taui = taulow + dtau*i ; |
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206 | ti = ParticleMass*taui; |
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207 | lossi = physicsVector->GetValue(ti,isOut); |
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208 | if(i==0) |
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209 | ci=0.5; |
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210 | else |
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211 | { |
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212 | if(i<nbin) |
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213 | ci=1.; |
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214 | else |
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215 | ci=0.5; |
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216 | } |
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217 | Value += ci/lossi; |
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218 | } |
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219 | Value *= ParticleMass*dtau; |
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220 | return Value; |
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221 | } |
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222 | |
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223 | // |
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224 | |
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225 | G4double G4VeLowEnergyLoss::RangeIntLog(G4PhysicsVector* physicsVector, |
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226 | G4int nbin) |
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227 | // num. integration, logarithmic binning |
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228 | { |
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229 | G4double ltt,dltau,Value,ui,taui,ti,lossi,ci; |
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230 | G4bool isOut; |
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231 | ltt = ltauhigh-ltaulow; |
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232 | dltau = ltt/nbin; |
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233 | Value = 0.; |
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234 | |
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235 | for (G4int i=0; i<=nbin; i++) |
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236 | { |
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237 | ui = ltaulow+dltau*i; |
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238 | taui = std::exp(ui); |
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239 | ti = ParticleMass*taui; |
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240 | lossi = physicsVector->GetValue(ti,isOut); |
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241 | if(i==0) |
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242 | ci=0.5; |
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243 | else |
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244 | { |
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245 | if(i<nbin) |
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246 | ci=1.; |
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247 | else |
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248 | ci=0.5; |
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249 | } |
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250 | Value += ci*taui/lossi; |
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251 | } |
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252 | Value *= ParticleMass*dltau; |
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253 | return Value; |
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254 | } |
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255 | |
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256 | |
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257 | // |
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258 | |
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259 | G4PhysicsTable* G4VeLowEnergyLoss::BuildLabTimeTable(G4PhysicsTable* theDEDXTable, |
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260 | G4PhysicsTable* theLabTimeTable, |
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261 | G4double lowestKineticEnergy, |
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262 | G4double highestKineticEnergy,G4int TotBin) |
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263 | |
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264 | { |
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265 | |
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266 | G4int numOfCouples = G4ProductionCutsTable::GetProductionCutsTable()->GetTableSize(); |
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267 | |
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268 | if(theLabTimeTable) |
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269 | { theLabTimeTable->clearAndDestroy(); |
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270 | delete theLabTimeTable; } |
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271 | theLabTimeTable = new G4PhysicsTable(numOfCouples); |
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272 | |
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273 | |
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274 | for (G4int J=0; J<numOfCouples; J++) |
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275 | { |
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276 | G4PhysicsLogVector* aVector; |
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277 | |
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278 | aVector = new G4PhysicsLogVector(lowestKineticEnergy, |
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279 | highestKineticEnergy,TotBin); |
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280 | |
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281 | BuildLabTimeVector(theDEDXTable, |
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282 | lowestKineticEnergy,highestKineticEnergy,TotBin,J,aVector); |
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283 | theLabTimeTable->insert(aVector); |
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284 | |
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285 | |
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286 | } |
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287 | return theLabTimeTable ; |
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288 | } |
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289 | |
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290 | // |
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291 | |
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292 | G4PhysicsTable* G4VeLowEnergyLoss::BuildProperTimeTable(G4PhysicsTable* theDEDXTable, |
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293 | G4PhysicsTable* theProperTimeTable, |
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294 | G4double lowestKineticEnergy, |
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295 | G4double highestKineticEnergy,G4int TotBin) |
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296 | |
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297 | { |
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298 | |
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299 | G4int numOfCouples = G4ProductionCutsTable::GetProductionCutsTable()->GetTableSize(); |
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300 | |
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301 | if(theProperTimeTable) |
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302 | { theProperTimeTable->clearAndDestroy(); |
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303 | delete theProperTimeTable; } |
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304 | theProperTimeTable = new G4PhysicsTable(numOfCouples); |
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305 | |
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306 | |
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307 | for (G4int J=0; J<numOfCouples; J++) |
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308 | { |
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309 | G4PhysicsLogVector* aVector; |
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310 | |
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311 | aVector = new G4PhysicsLogVector(lowestKineticEnergy, |
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312 | highestKineticEnergy,TotBin); |
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313 | |
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314 | BuildProperTimeVector(theDEDXTable, |
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315 | lowestKineticEnergy,highestKineticEnergy,TotBin,J,aVector); |
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316 | theProperTimeTable->insert(aVector); |
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317 | |
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318 | |
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319 | } |
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320 | return theProperTimeTable ; |
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321 | } |
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322 | |
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323 | // |
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324 | |
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325 | void G4VeLowEnergyLoss::BuildLabTimeVector(G4PhysicsTable* theDEDXTable, |
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326 | G4double, // lowestKineticEnergy |
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327 | G4double highestKineticEnergy, G4int TotBin, |
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328 | G4int materialIndex, G4PhysicsLogVector* timeVector) |
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329 | // create lab time vector for a material |
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330 | { |
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331 | |
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332 | G4int nbin=100; |
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333 | G4bool isOut; |
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334 | G4double tlim=5.*keV,parlowen=0.4,ppar=0.5-parlowen ; |
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335 | G4double losslim,clim,taulim,timelim,ltaulim,ltaumax, |
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336 | LowEdgeEnergy,tau,Value ; |
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337 | |
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338 | G4PhysicsVector* physicsVector= (*theDEDXTable)[materialIndex]; |
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339 | |
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340 | // low energy part first... |
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341 | losslim = physicsVector->GetValue(tlim,isOut); |
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342 | taulim=tlim/ParticleMass ; |
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343 | clim=std::sqrt(ParticleMass*tlim/2.)/(c_light*losslim*ppar) ; |
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344 | ltaulim = std::log(taulim); |
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345 | ltaumax = std::log(highestKineticEnergy/ParticleMass) ; |
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346 | |
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347 | G4int i=-1; |
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348 | G4double oldValue = 0. ; |
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349 | G4double tauold ; |
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350 | do |
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351 | { |
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352 | i += 1 ; |
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353 | LowEdgeEnergy = timeVector->GetLowEdgeEnergy(i); |
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354 | tau = LowEdgeEnergy/ParticleMass ; |
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355 | if ( tau <= taulim ) |
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356 | { |
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357 | Value = clim*std::exp(ppar*std::log(tau/taulim)) ; |
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358 | } |
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359 | else |
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360 | { |
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361 | timelim=clim ; |
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362 | ltaulow = std::log(taulim); |
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363 | ltauhigh = std::log(tau); |
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364 | Value = timelim+LabTimeIntLog(physicsVector,nbin); |
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365 | } |
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366 | timeVector->PutValue(i,Value); |
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367 | oldValue = Value ; |
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368 | tauold = tau ; |
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369 | } while (tau<=taulim) ; |
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370 | i += 1 ; |
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371 | for (G4int j=i; j<TotBin; j++) |
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372 | { |
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373 | LowEdgeEnergy = timeVector->GetLowEdgeEnergy(j); |
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374 | tau = LowEdgeEnergy/ParticleMass ; |
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375 | ltaulow = std::log(tauold); |
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376 | ltauhigh = std::log(tau); |
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377 | Value = oldValue+LabTimeIntLog(physicsVector,nbin); |
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378 | timeVector->PutValue(j,Value); |
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379 | oldValue = Value ; |
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380 | tauold = tau ; |
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381 | } |
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382 | } |
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383 | |
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384 | // |
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385 | |
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386 | void G4VeLowEnergyLoss::BuildProperTimeVector(G4PhysicsTable* theDEDXTable, |
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387 | G4double, // lowestKineticEnergy |
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388 | G4double highestKineticEnergy, G4int TotBin, |
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389 | G4int materialIndex, G4PhysicsLogVector* timeVector) |
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390 | // create proper time vector for a material |
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391 | { |
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392 | G4int nbin=100; |
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393 | G4bool isOut; |
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394 | G4double tlim=5.*keV,parlowen=0.4,ppar=0.5-parlowen ; |
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395 | G4double losslim,clim,taulim,timelim,ltaulim,ltaumax, |
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396 | LowEdgeEnergy,tau,Value ; |
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397 | |
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398 | G4PhysicsVector* physicsVector= (*theDEDXTable)[materialIndex]; |
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399 | //const G4MaterialTable* theMaterialTable = G4Material::GetMaterialTable(); |
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400 | |
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401 | // low energy part first... |
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402 | losslim = physicsVector->GetValue(tlim,isOut); |
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403 | taulim=tlim/ParticleMass ; |
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404 | clim=std::sqrt(ParticleMass*tlim/2.)/(c_light*losslim*ppar) ; |
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405 | ltaulim = std::log(taulim); |
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406 | ltaumax = std::log(highestKineticEnergy/ParticleMass) ; |
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407 | |
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408 | G4int i=-1; |
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409 | G4double oldValue = 0. ; |
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410 | G4double tauold ; |
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411 | do |
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412 | { |
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413 | i += 1 ; |
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414 | LowEdgeEnergy = timeVector->GetLowEdgeEnergy(i); |
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415 | tau = LowEdgeEnergy/ParticleMass ; |
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416 | if ( tau <= taulim ) |
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417 | { |
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418 | Value = clim*std::exp(ppar*std::log(tau/taulim)) ; |
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419 | } |
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420 | else |
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421 | { |
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422 | timelim=clim ; |
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423 | ltaulow = std::log(taulim); |
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424 | ltauhigh = std::log(tau); |
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425 | Value = timelim+ProperTimeIntLog(physicsVector,nbin); |
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426 | } |
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427 | timeVector->PutValue(i,Value); |
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428 | oldValue = Value ; |
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429 | tauold = tau ; |
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430 | } while (tau<=taulim) ; |
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431 | i += 1 ; |
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432 | for (G4int j=i; j<TotBin; j++) |
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433 | { |
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434 | LowEdgeEnergy = timeVector->GetLowEdgeEnergy(j); |
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435 | tau = LowEdgeEnergy/ParticleMass ; |
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436 | ltaulow = std::log(tauold); |
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437 | ltauhigh = std::log(tau); |
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438 | Value = oldValue+ProperTimeIntLog(physicsVector,nbin); |
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439 | timeVector->PutValue(j,Value); |
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440 | oldValue = Value ; |
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441 | tauold = tau ; |
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442 | } |
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443 | } |
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444 | |
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445 | // |
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446 | |
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447 | G4double G4VeLowEnergyLoss::LabTimeIntLog(G4PhysicsVector* physicsVector, |
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448 | G4int nbin) |
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449 | // num. integration, logarithmic binning |
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450 | { |
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451 | G4double ltt,dltau,Value,ui,taui,ti,lossi,ci; |
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452 | G4bool isOut; |
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453 | ltt = ltauhigh-ltaulow; |
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454 | dltau = ltt/nbin; |
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455 | Value = 0.; |
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456 | |
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457 | for (G4int i=0; i<=nbin; i++) |
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458 | { |
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459 | ui = ltaulow+dltau*i; |
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460 | taui = std::exp(ui); |
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461 | ti = ParticleMass*taui; |
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462 | lossi = physicsVector->GetValue(ti,isOut); |
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463 | if(i==0) |
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464 | ci=0.5; |
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465 | else |
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466 | { |
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467 | if(i<nbin) |
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468 | ci=1.; |
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469 | else |
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470 | ci=0.5; |
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471 | } |
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472 | Value += ci*taui*(ti+ParticleMass)/(std::sqrt(ti*(ti+2.*ParticleMass))*lossi); |
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473 | } |
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474 | Value *= ParticleMass*dltau/c_light; |
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475 | return Value; |
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476 | } |
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477 | |
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478 | // |
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479 | |
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480 | G4double G4VeLowEnergyLoss::ProperTimeIntLog(G4PhysicsVector* physicsVector, |
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481 | G4int nbin) |
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482 | // num. integration, logarithmic binning |
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483 | { |
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484 | G4double ltt,dltau,Value,ui,taui,ti,lossi,ci; |
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485 | G4bool isOut; |
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486 | ltt = ltauhigh-ltaulow; |
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487 | dltau = ltt/nbin; |
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488 | Value = 0.; |
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489 | |
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490 | for (G4int i=0; i<=nbin; i++) |
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491 | { |
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492 | ui = ltaulow+dltau*i; |
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493 | taui = std::exp(ui); |
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494 | ti = ParticleMass*taui; |
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495 | lossi = physicsVector->GetValue(ti,isOut); |
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496 | if(i==0) |
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497 | ci=0.5; |
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498 | else |
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499 | { |
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500 | if(i<nbin) |
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501 | ci=1.; |
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502 | else |
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503 | ci=0.5; |
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504 | } |
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505 | Value += ci*taui*ParticleMass/(std::sqrt(ti*(ti+2.*ParticleMass))*lossi); |
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506 | } |
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507 | Value *= ParticleMass*dltau/c_light; |
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508 | return Value; |
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509 | } |
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510 | |
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511 | // |
---|
512 | |
---|
513 | G4PhysicsTable* G4VeLowEnergyLoss::BuildInverseRangeTable(G4PhysicsTable* theRangeTable, |
---|
514 | G4PhysicsTable*, |
---|
515 | G4PhysicsTable*, |
---|
516 | G4PhysicsTable*, |
---|
517 | G4PhysicsTable* theInverseRangeTable, |
---|
518 | G4double, // lowestKineticEnergy, |
---|
519 | G4double, // highestKineticEnergy |
---|
520 | G4int ) // nbins |
---|
521 | // Build inverse table of the range table |
---|
522 | { |
---|
523 | G4bool b; |
---|
524 | |
---|
525 | G4int numOfCouples = G4ProductionCutsTable::GetProductionCutsTable()->GetTableSize(); |
---|
526 | |
---|
527 | if(theInverseRangeTable) |
---|
528 | { theInverseRangeTable->clearAndDestroy(); |
---|
529 | delete theInverseRangeTable; } |
---|
530 | theInverseRangeTable = new G4PhysicsTable(numOfCouples); |
---|
531 | |
---|
532 | // loop for materials |
---|
533 | for (G4int i=0; i<numOfCouples; i++) |
---|
534 | { |
---|
535 | |
---|
536 | G4PhysicsVector* pv = (*theRangeTable)[i]; |
---|
537 | size_t nbins = pv->GetVectorLength(); |
---|
538 | G4double elow = pv->GetLowEdgeEnergy(0); |
---|
539 | G4double ehigh = pv->GetLowEdgeEnergy(nbins-1); |
---|
540 | G4double rlow = pv->GetValue(elow, b); |
---|
541 | G4double rhigh = pv->GetValue(ehigh, b); |
---|
542 | |
---|
543 | rhigh *= std::exp(std::log(rhigh/rlow)/((G4double)(nbins-1))); |
---|
544 | |
---|
545 | G4PhysicsLogVector* v = new G4PhysicsLogVector(rlow, rhigh, nbins); |
---|
546 | |
---|
547 | v->PutValue(0,elow); |
---|
548 | G4double energy1 = elow; |
---|
549 | G4double range1 = rlow; |
---|
550 | G4double energy2 = elow; |
---|
551 | G4double range2 = rlow; |
---|
552 | size_t ilow = 0; |
---|
553 | size_t ihigh; |
---|
554 | |
---|
555 | for (size_t j=1; j<nbins; j++) { |
---|
556 | |
---|
557 | G4double range = v->GetLowEdgeEnergy(j); |
---|
558 | |
---|
559 | for (ihigh=ilow+1; ihigh<nbins; ihigh++) { |
---|
560 | energy2 = pv->GetLowEdgeEnergy(ihigh); |
---|
561 | range2 = pv->GetValue(energy2, b); |
---|
562 | if(range2 >= range || ihigh == nbins-1) { |
---|
563 | ilow = ihigh - 1; |
---|
564 | energy1 = pv->GetLowEdgeEnergy(ilow); |
---|
565 | range1 = pv->GetValue(energy1, b); |
---|
566 | break; |
---|
567 | } |
---|
568 | } |
---|
569 | |
---|
570 | G4double e = std::log(energy1) + std::log(energy2/energy1)*std::log(range/range1)/std::log(range2/range1); |
---|
571 | |
---|
572 | v->PutValue(j,std::exp(e)); |
---|
573 | } |
---|
574 | theInverseRangeTable->insert(v); |
---|
575 | |
---|
576 | } |
---|
577 | return theInverseRangeTable ; |
---|
578 | } |
---|
579 | |
---|
580 | // |
---|
581 | |
---|
582 | void G4VeLowEnergyLoss::InvertRangeVector(G4PhysicsTable* theRangeTable, |
---|
583 | G4PhysicsTable* theRangeCoeffATable, |
---|
584 | G4PhysicsTable* theRangeCoeffBTable, |
---|
585 | G4PhysicsTable* theRangeCoeffCTable, |
---|
586 | G4double lowestKineticEnergy, |
---|
587 | G4double highestKineticEnergy, G4int TotBin, |
---|
588 | G4int materialIndex, G4PhysicsLogVector* aVector) |
---|
589 | // invert range vector for a material |
---|
590 | { |
---|
591 | G4double LowEdgeRange,A,B,C,discr,KineticEnergy ; |
---|
592 | G4double RTable = std::exp(std::log(highestKineticEnergy/lowestKineticEnergy)/TotBin) ; |
---|
593 | G4double Tbin = lowestKineticEnergy/RTable ; |
---|
594 | G4double rangebin = 0.0 ; |
---|
595 | G4int binnumber = -1 ; |
---|
596 | G4bool isOut ; |
---|
597 | |
---|
598 | //loop for range values |
---|
599 | for( G4int i=0; i<TotBin; i++) |
---|
600 | { |
---|
601 | LowEdgeRange = aVector->GetLowEdgeEnergy(i) ; //i.e. GetLowEdgeValue(i) |
---|
602 | if( rangebin < LowEdgeRange ) |
---|
603 | { |
---|
604 | do |
---|
605 | { |
---|
606 | binnumber += 1 ; |
---|
607 | Tbin *= RTable ; |
---|
608 | rangebin = (*theRangeTable)(materialIndex)->GetValue(Tbin,isOut) ; |
---|
609 | } |
---|
610 | while ((rangebin < LowEdgeRange) && (binnumber < TotBin )) ; |
---|
611 | } |
---|
612 | |
---|
613 | if(binnumber == 0) |
---|
614 | KineticEnergy = lowestKineticEnergy ; |
---|
615 | else if(binnumber == TotBin-1) |
---|
616 | KineticEnergy = highestKineticEnergy ; |
---|
617 | else |
---|
618 | { |
---|
619 | A = (*(*theRangeCoeffATable)(materialIndex))(binnumber-1) ; |
---|
620 | B = (*(*theRangeCoeffBTable)(materialIndex))(binnumber-1) ; |
---|
621 | C = (*(*theRangeCoeffCTable)(materialIndex))(binnumber-1) ; |
---|
622 | if(A==0.) |
---|
623 | KineticEnergy = (LowEdgeRange -C )/B ; |
---|
624 | else |
---|
625 | { |
---|
626 | discr = B*B - 4.*A*(C-LowEdgeRange); |
---|
627 | discr = discr>0. ? std::sqrt(discr) : 0.; |
---|
628 | KineticEnergy = 0.5*(discr-B)/A ; |
---|
629 | } |
---|
630 | } |
---|
631 | |
---|
632 | aVector->PutValue(i,KineticEnergy) ; |
---|
633 | } |
---|
634 | } |
---|
635 | |
---|
636 | // |
---|
637 | |
---|
638 | G4PhysicsTable* G4VeLowEnergyLoss::BuildRangeCoeffATable(G4PhysicsTable* theRangeTable, |
---|
639 | G4PhysicsTable* theRangeCoeffATable, |
---|
640 | G4double lowestKineticEnergy, |
---|
641 | G4double highestKineticEnergy, G4int TotBin) |
---|
642 | // Build tables of coefficients for the energy loss calculation |
---|
643 | // create table for coefficients "A" |
---|
644 | { |
---|
645 | |
---|
646 | G4int numOfCouples = G4ProductionCutsTable::GetProductionCutsTable()->GetTableSize(); |
---|
647 | |
---|
648 | if(theRangeCoeffATable) |
---|
649 | { theRangeCoeffATable->clearAndDestroy(); |
---|
650 | delete theRangeCoeffATable; } |
---|
651 | theRangeCoeffATable = new G4PhysicsTable(numOfCouples); |
---|
652 | |
---|
653 | G4double RTable = std::exp(std::log(highestKineticEnergy/lowestKineticEnergy)/TotBin) ; |
---|
654 | G4double R2 = RTable*RTable ; |
---|
655 | G4double R1 = RTable+1.; |
---|
656 | G4double w = R1*(RTable-1.)*(RTable-1.); |
---|
657 | G4double w1 = RTable/w , w2 = -RTable*R1/w , w3 = R2/w ; |
---|
658 | G4double Ti , Tim , Tip , Ri , Rim , Rip , Value ; |
---|
659 | G4bool isOut; |
---|
660 | |
---|
661 | // loop for materials |
---|
662 | for (G4int J=0; J<numOfCouples; J++) |
---|
663 | { |
---|
664 | G4int binmax=TotBin ; |
---|
665 | G4PhysicsLinearVector* aVector = |
---|
666 | new G4PhysicsLinearVector(0.,binmax, TotBin); |
---|
667 | Ti = lowestKineticEnergy ; |
---|
668 | G4PhysicsVector* rangeVector= (*theRangeTable)[J]; |
---|
669 | |
---|
670 | for ( G4int i=0; i<TotBin; i++) |
---|
671 | { |
---|
672 | Ri = rangeVector->GetValue(Ti,isOut) ; |
---|
673 | if ( i==0 ) |
---|
674 | Rim = 0. ; |
---|
675 | else |
---|
676 | { |
---|
677 | Tim = Ti/RTable ; |
---|
678 | Rim = rangeVector->GetValue(Tim,isOut); |
---|
679 | } |
---|
680 | if ( i==(TotBin-1)) |
---|
681 | Rip = Ri ; |
---|
682 | else |
---|
683 | { |
---|
684 | Tip = Ti*RTable ; |
---|
685 | Rip = rangeVector->GetValue(Tip,isOut); |
---|
686 | } |
---|
687 | Value = (w1*Rip + w2*Ri + w3*Rim)/(Ti*Ti) ; |
---|
688 | |
---|
689 | aVector->PutValue(i,Value); |
---|
690 | Ti = RTable*Ti ; |
---|
691 | } |
---|
692 | |
---|
693 | theRangeCoeffATable->insert(aVector); |
---|
694 | } |
---|
695 | return theRangeCoeffATable ; |
---|
696 | } |
---|
697 | |
---|
698 | // |
---|
699 | |
---|
700 | G4PhysicsTable* G4VeLowEnergyLoss::BuildRangeCoeffBTable(G4PhysicsTable* theRangeTable, |
---|
701 | G4PhysicsTable* theRangeCoeffBTable, |
---|
702 | G4double lowestKineticEnergy, |
---|
703 | G4double highestKineticEnergy, G4int TotBin) |
---|
704 | // Build tables of coefficients for the energy loss calculation |
---|
705 | // create table for coefficients "B" |
---|
706 | { |
---|
707 | |
---|
708 | G4int numOfCouples = G4ProductionCutsTable::GetProductionCutsTable()->GetTableSize(); |
---|
709 | |
---|
710 | if(theRangeCoeffBTable) |
---|
711 | { theRangeCoeffBTable->clearAndDestroy(); |
---|
712 | delete theRangeCoeffBTable; } |
---|
713 | theRangeCoeffBTable = new G4PhysicsTable(numOfCouples); |
---|
714 | |
---|
715 | G4double RTable = std::exp(std::log(highestKineticEnergy/lowestKineticEnergy)/TotBin) ; |
---|
716 | G4double R2 = RTable*RTable ; |
---|
717 | G4double R1 = RTable+1.; |
---|
718 | G4double w = R1*(RTable-1.)*(RTable-1.); |
---|
719 | G4double w1 = -R1/w , w2 = R1*(R2+1.)/w , w3 = -R2*R1/w ; |
---|
720 | G4double Ti , Tim , Tip , Ri , Rim , Rip , Value ; |
---|
721 | G4bool isOut; |
---|
722 | |
---|
723 | // loop for materials |
---|
724 | for (G4int J=0; J<numOfCouples; J++) |
---|
725 | { |
---|
726 | G4int binmax=TotBin ; |
---|
727 | G4PhysicsLinearVector* aVector = |
---|
728 | new G4PhysicsLinearVector(0.,binmax, TotBin); |
---|
729 | Ti = lowestKineticEnergy ; |
---|
730 | G4PhysicsVector* rangeVector= (*theRangeTable)[J]; |
---|
731 | |
---|
732 | for ( G4int i=0; i<TotBin; i++) |
---|
733 | { |
---|
734 | Ri = rangeVector->GetValue(Ti,isOut) ; |
---|
735 | if ( i==0 ) |
---|
736 | Rim = 0. ; |
---|
737 | else |
---|
738 | { |
---|
739 | Tim = Ti/RTable ; |
---|
740 | Rim = rangeVector->GetValue(Tim,isOut); |
---|
741 | } |
---|
742 | if ( i==(TotBin-1)) |
---|
743 | Rip = Ri ; |
---|
744 | else |
---|
745 | { |
---|
746 | Tip = Ti*RTable ; |
---|
747 | Rip = rangeVector->GetValue(Tip,isOut); |
---|
748 | } |
---|
749 | Value = (w1*Rip + w2*Ri + w3*Rim)/Ti; |
---|
750 | |
---|
751 | aVector->PutValue(i,Value); |
---|
752 | Ti = RTable*Ti ; |
---|
753 | } |
---|
754 | theRangeCoeffBTable->insert(aVector); |
---|
755 | } |
---|
756 | return theRangeCoeffBTable ; |
---|
757 | } |
---|
758 | |
---|
759 | // |
---|
760 | |
---|
761 | G4PhysicsTable* G4VeLowEnergyLoss::BuildRangeCoeffCTable(G4PhysicsTable* theRangeTable, |
---|
762 | G4PhysicsTable* theRangeCoeffCTable, |
---|
763 | G4double lowestKineticEnergy, |
---|
764 | G4double highestKineticEnergy, G4int TotBin) |
---|
765 | // Build tables of coefficients for the energy loss calculation |
---|
766 | // create table for coefficients "C" |
---|
767 | { |
---|
768 | |
---|
769 | G4int numOfCouples = G4ProductionCutsTable::GetProductionCutsTable()->GetTableSize(); |
---|
770 | |
---|
771 | if(theRangeCoeffCTable) |
---|
772 | { theRangeCoeffCTable->clearAndDestroy(); |
---|
773 | delete theRangeCoeffCTable; } |
---|
774 | theRangeCoeffCTable = new G4PhysicsTable(numOfCouples); |
---|
775 | |
---|
776 | G4double RTable = std::exp(std::log(highestKineticEnergy/lowestKineticEnergy)/TotBin) ; |
---|
777 | G4double R2 = RTable*RTable ; |
---|
778 | G4double R1 = RTable+1.; |
---|
779 | G4double w = R1*(RTable-1.)*(RTable-1.); |
---|
780 | G4double w1 = 1./w , w2 = -RTable*R1/w , w3 = RTable*R2/w ; |
---|
781 | G4double Ti , Tim , Tip , Ri , Rim , Rip , Value ; |
---|
782 | G4bool isOut; |
---|
783 | |
---|
784 | // loop for materials |
---|
785 | for (G4int J=0; J<numOfCouples; J++) |
---|
786 | { |
---|
787 | G4int binmax=TotBin ; |
---|
788 | G4PhysicsLinearVector* aVector = |
---|
789 | new G4PhysicsLinearVector(0.,binmax, TotBin); |
---|
790 | Ti = lowestKineticEnergy ; |
---|
791 | G4PhysicsVector* rangeVector= (*theRangeTable)[J]; |
---|
792 | |
---|
793 | for ( G4int i=0; i<TotBin; i++) |
---|
794 | { |
---|
795 | Ri = rangeVector->GetValue(Ti,isOut) ; |
---|
796 | if ( i==0 ) |
---|
797 | Rim = 0. ; |
---|
798 | else |
---|
799 | { |
---|
800 | Tim = Ti/RTable ; |
---|
801 | Rim = rangeVector->GetValue(Tim,isOut); |
---|
802 | } |
---|
803 | if ( i==(TotBin-1)) |
---|
804 | Rip = Ri ; |
---|
805 | else |
---|
806 | { |
---|
807 | Tip = Ti*RTable ; |
---|
808 | Rip = rangeVector->GetValue(Tip,isOut); |
---|
809 | } |
---|
810 | Value = w1*Rip + w2*Ri + w3*Rim ; |
---|
811 | |
---|
812 | aVector->PutValue(i,Value); |
---|
813 | Ti = RTable*Ti ; |
---|
814 | } |
---|
815 | theRangeCoeffCTable->insert(aVector); |
---|
816 | } |
---|
817 | return theRangeCoeffCTable ; |
---|
818 | } |
---|
819 | |
---|
820 | // |
---|
821 | |
---|
822 | G4double G4VeLowEnergyLoss::GetLossWithFluct(const G4DynamicParticle* aParticle, |
---|
823 | const G4MaterialCutsCouple* couple, |
---|
824 | G4double MeanLoss, |
---|
825 | G4double step) |
---|
826 | // calculate actual loss from the mean loss |
---|
827 | // The model used to get the fluctuation is essentially the same as in Glandz in Geant3. |
---|
828 | { |
---|
829 | static const G4double minLoss = 1.*eV ; |
---|
830 | static const G4double probLim = 0.01 ; |
---|
831 | static const G4double sumaLim = -std::log(probLim) ; |
---|
832 | static const G4double alim=10.; |
---|
833 | static const G4double kappa = 10. ; |
---|
834 | static const G4double factor = twopi_mc2_rcl2 ; |
---|
835 | const G4Material* aMaterial = couple->GetMaterial(); |
---|
836 | |
---|
837 | // check if the material has changed ( cache mechanism) |
---|
838 | |
---|
839 | if (aMaterial != lastMaterial) |
---|
840 | { |
---|
841 | lastMaterial = aMaterial; |
---|
842 | imat = couple->GetIndex(); |
---|
843 | f1Fluct = aMaterial->GetIonisation()->GetF1fluct(); |
---|
844 | f2Fluct = aMaterial->GetIonisation()->GetF2fluct(); |
---|
845 | e1Fluct = aMaterial->GetIonisation()->GetEnergy1fluct(); |
---|
846 | e2Fluct = aMaterial->GetIonisation()->GetEnergy2fluct(); |
---|
847 | e1LogFluct = aMaterial->GetIonisation()->GetLogEnergy1fluct(); |
---|
848 | e2LogFluct = aMaterial->GetIonisation()->GetLogEnergy2fluct(); |
---|
849 | rateFluct = aMaterial->GetIonisation()->GetRateionexcfluct(); |
---|
850 | ipotFluct = aMaterial->GetIonisation()->GetMeanExcitationEnergy(); |
---|
851 | ipotLogFluct = aMaterial->GetIonisation()->GetLogMeanExcEnergy(); |
---|
852 | } |
---|
853 | G4double threshold,w1,w2,C, |
---|
854 | beta2,suma,e0,loss,lossc,w; |
---|
855 | G4double a1,a2,a3; |
---|
856 | G4int p1,p2,p3; |
---|
857 | G4int nb; |
---|
858 | G4double Corrfac, na,alfa,rfac,namean,sa,alfa1,ea,sea; |
---|
859 | // G4double dp1; |
---|
860 | G4double dp3; |
---|
861 | G4double siga ; |
---|
862 | |
---|
863 | // shortcut for very very small loss |
---|
864 | if(MeanLoss < minLoss) return MeanLoss ; |
---|
865 | |
---|
866 | // get particle data |
---|
867 | G4double Tkin = aParticle->GetKineticEnergy(); |
---|
868 | |
---|
869 | // G4cout << "MGP -- Fluc Tkin " << Tkin/keV << " keV " << " MeanLoss = " << MeanLoss/keV << G4endl; |
---|
870 | |
---|
871 | threshold = (*((G4ProductionCutsTable::GetProductionCutsTable()) |
---|
872 | ->GetEnergyCutsVector(1)))[imat]; |
---|
873 | G4double rmass = electron_mass_c2/ParticleMass; |
---|
874 | G4double tau = Tkin/ParticleMass, tau1 = tau+1., tau2 = tau*(tau+2.); |
---|
875 | G4double Tm = 2.*electron_mass_c2*tau2/(1.+2.*tau1*rmass+rmass*rmass); |
---|
876 | |
---|
877 | // G4cout << "MGP Particle mass " << ParticleMass/MeV << " Tm " << Tm << G4endl; |
---|
878 | |
---|
879 | if(Tm > threshold) Tm = threshold; |
---|
880 | beta2 = tau2/(tau1*tau1); |
---|
881 | |
---|
882 | // Gaussian fluctuation ? |
---|
883 | if(MeanLoss >= kappa*Tm || MeanLoss <= kappa*ipotFluct) |
---|
884 | { |
---|
885 | G4double electronDensity = aMaterial->GetElectronDensity() ; |
---|
886 | siga = std::sqrt(Tm*(1.0-0.5*beta2)*step* |
---|
887 | factor*electronDensity/beta2) ; |
---|
888 | do { |
---|
889 | loss = G4RandGauss::shoot(MeanLoss,siga) ; |
---|
890 | } while (loss < 0. || loss > 2.0*MeanLoss); |
---|
891 | return loss ; |
---|
892 | } |
---|
893 | |
---|
894 | w1 = Tm/ipotFluct; |
---|
895 | w2 = std::log(2.*electron_mass_c2*tau2); |
---|
896 | |
---|
897 | C = MeanLoss*(1.-rateFluct)/(w2-ipotLogFluct-beta2); |
---|
898 | |
---|
899 | a1 = C*f1Fluct*(w2-e1LogFluct-beta2)/e1Fluct; |
---|
900 | a2 = C*f2Fluct*(w2-e2LogFluct-beta2)/e2Fluct; |
---|
901 | a3 = rateFluct*MeanLoss*(Tm-ipotFluct)/(ipotFluct*Tm*std::log(w1)); |
---|
902 | |
---|
903 | suma = a1+a2+a3; |
---|
904 | |
---|
905 | loss = 0. ; |
---|
906 | |
---|
907 | if(suma < sumaLim) // very small Step |
---|
908 | { |
---|
909 | e0 = aMaterial->GetIonisation()->GetEnergy0fluct(); |
---|
910 | // G4cout << "MGP e0 = " << e0/keV << G4endl; |
---|
911 | |
---|
912 | if(Tm == ipotFluct) |
---|
913 | { |
---|
914 | a3 = MeanLoss/e0; |
---|
915 | |
---|
916 | if(a3>alim) |
---|
917 | { |
---|
918 | siga=std::sqrt(a3) ; |
---|
919 | p3 = std::max(0,G4int(G4RandGauss::shoot(a3,siga)+0.5)); |
---|
920 | } |
---|
921 | else p3 = G4Poisson(a3); |
---|
922 | |
---|
923 | loss = p3*e0 ; |
---|
924 | |
---|
925 | if(p3 > 0) loss += (1.-2.*G4UniformRand())*e0 ; |
---|
926 | // G4cout << "MGP very small step " << loss/keV << G4endl; |
---|
927 | } |
---|
928 | else |
---|
929 | { |
---|
930 | // G4cout << "MGP old Tm = " << Tm << " " << ipotFluct << " " << e0 << G4endl; |
---|
931 | Tm = Tm-ipotFluct+e0 ; |
---|
932 | |
---|
933 | // MGP ---- workaround to avoid log argument<0, TO BE CHECKED |
---|
934 | if (Tm <= 0.) |
---|
935 | { |
---|
936 | loss = MeanLoss; |
---|
937 | p3 = 0; |
---|
938 | // G4cout << "MGP correction loss = MeanLoss " << loss/keV << G4endl; |
---|
939 | } |
---|
940 | else |
---|
941 | { |
---|
942 | a3 = MeanLoss*(Tm-e0)/(Tm*e0*std::log(Tm/e0)); |
---|
943 | |
---|
944 | // G4cout << "MGP new Tm = " << Tm << " " << ipotFluct << " " << e0 << " a3= " << a3 << G4endl; |
---|
945 | |
---|
946 | if(a3>alim) |
---|
947 | { |
---|
948 | siga=std::sqrt(a3) ; |
---|
949 | p3 = std::max(0,G4int(G4RandGauss::shoot(a3,siga)+0.5)); |
---|
950 | } |
---|
951 | else |
---|
952 | p3 = G4Poisson(a3); |
---|
953 | //G4cout << "MGP p3 " << p3 << G4endl; |
---|
954 | |
---|
955 | } |
---|
956 | |
---|
957 | if(p3 > 0) |
---|
958 | { |
---|
959 | w = (Tm-e0)/Tm ; |
---|
960 | if(p3 > nmaxCont2) |
---|
961 | { |
---|
962 | // G4cout << "MGP dp3 " << dp3 << " p3 " << p3 << " " << nmaxCont2 << G4endl; |
---|
963 | dp3 = G4double(p3) ; |
---|
964 | Corrfac = dp3/G4double(nmaxCont2) ; |
---|
965 | p3 = nmaxCont2 ; |
---|
966 | } |
---|
967 | else |
---|
968 | Corrfac = 1. ; |
---|
969 | |
---|
970 | for(G4int i=0; i<p3; i++) loss += 1./(1.-w*G4UniformRand()) ; |
---|
971 | loss *= e0*Corrfac ; |
---|
972 | // G4cout << "MGP Corrfac = " << Corrfac << " e0 = " << e0/keV << " loss = " << loss/keV << G4endl; |
---|
973 | } |
---|
974 | } |
---|
975 | } |
---|
976 | |
---|
977 | else // not so small Step |
---|
978 | { |
---|
979 | // excitation type 1 |
---|
980 | if(a1>alim) |
---|
981 | { |
---|
982 | siga=std::sqrt(a1) ; |
---|
983 | p1 = std::max(0,int(G4RandGauss::shoot(a1,siga)+0.5)); |
---|
984 | } |
---|
985 | else |
---|
986 | p1 = G4Poisson(a1); |
---|
987 | |
---|
988 | // excitation type 2 |
---|
989 | if(a2>alim) |
---|
990 | { |
---|
991 | siga=std::sqrt(a2) ; |
---|
992 | p2 = std::max(0,int(G4RandGauss::shoot(a2,siga)+0.5)); |
---|
993 | } |
---|
994 | else |
---|
995 | p2 = G4Poisson(a2); |
---|
996 | |
---|
997 | loss = p1*e1Fluct+p2*e2Fluct; |
---|
998 | |
---|
999 | // smearing to avoid unphysical peaks |
---|
1000 | if(p2 > 0) |
---|
1001 | loss += (1.-2.*G4UniformRand())*e2Fluct; |
---|
1002 | else if (loss>0.) |
---|
1003 | loss += (1.-2.*G4UniformRand())*e1Fluct; |
---|
1004 | |
---|
1005 | // ionisation ....................................... |
---|
1006 | if(a3 > 0.) |
---|
1007 | { |
---|
1008 | if(a3>alim) |
---|
1009 | { |
---|
1010 | siga=std::sqrt(a3) ; |
---|
1011 | p3 = std::max(0,int(G4RandGauss::shoot(a3,siga)+0.5)); |
---|
1012 | } |
---|
1013 | else |
---|
1014 | p3 = G4Poisson(a3); |
---|
1015 | |
---|
1016 | lossc = 0.; |
---|
1017 | if(p3 > 0) |
---|
1018 | { |
---|
1019 | na = 0.; |
---|
1020 | alfa = 1.; |
---|
1021 | if (p3 > nmaxCont2) |
---|
1022 | { |
---|
1023 | dp3 = G4double(p3); |
---|
1024 | rfac = dp3/(G4double(nmaxCont2)+dp3); |
---|
1025 | namean = G4double(p3)*rfac; |
---|
1026 | sa = G4double(nmaxCont1)*rfac; |
---|
1027 | na = G4RandGauss::shoot(namean,sa); |
---|
1028 | if (na > 0.) |
---|
1029 | { |
---|
1030 | alfa = w1*G4double(nmaxCont2+p3)/(w1*G4double(nmaxCont2)+G4double(p3)); |
---|
1031 | alfa1 = alfa*std::log(alfa)/(alfa-1.); |
---|
1032 | ea = na*ipotFluct*alfa1; |
---|
1033 | sea = ipotFluct*std::sqrt(na*(alfa-alfa1*alfa1)); |
---|
1034 | lossc += G4RandGauss::shoot(ea,sea); |
---|
1035 | } |
---|
1036 | } |
---|
1037 | |
---|
1038 | nb = G4int(G4double(p3)-na); |
---|
1039 | if (nb > 0) |
---|
1040 | { |
---|
1041 | w2 = alfa*ipotFluct; |
---|
1042 | w = (Tm-w2)/Tm; |
---|
1043 | for (G4int k=0; k<nb; k++) lossc += w2/(1.-w*G4UniformRand()); |
---|
1044 | } |
---|
1045 | } |
---|
1046 | |
---|
1047 | loss += lossc; |
---|
1048 | } |
---|
1049 | } |
---|
1050 | |
---|
1051 | return loss ; |
---|
1052 | } |
---|
1053 | |
---|
1054 | // |
---|
1055 | |
---|