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: G4eLowEnergyLoss.cc,v 1.35 2006/06/29 19:42:06 gunter Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-02-ref-02 $ |
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29 | // |
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30 | // ----------------------------------------------------------- |
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31 | // GEANT 4 class implementation file |
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32 | // |
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33 | // History: based on object model of |
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34 | // 2nd December 1995, G.Cosmo |
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35 | // ---------- G4eLowEnergyLoss physics process ----------- |
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36 | // by Laszlo Urban, 20 March 1997 |
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37 | // ************************************************************** |
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38 | // It calculates the energy loss of e+/e-. |
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39 | // -------------------------------------------------------------- |
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40 | // |
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41 | // 08-05-97: small changes by L.Urban |
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42 | // 27-05-98: several bugs and inconsistencies are corrected, |
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43 | // new table (the inverse of the range table) added , |
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44 | // AlongStepDoit uses now this new table. L.Urban |
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45 | // 08-09-98: cleanup |
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46 | // 24-09-98: rndmStepFlag false by default (no randomization of the step) |
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47 | // 14-10-98: messenger file added. |
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48 | // 16-10-98: public method SetStepFunction() |
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49 | // 20-01-99: important correction in AlongStepDoIt , L.Urban |
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50 | // 10/02/00 modifications , new e.m. structure, L.Urban |
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51 | // 11/04/00: Bug fix in dE/dx fluctuation simulation, Veronique Lefebure |
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52 | // 19-09-00 change of fluctuation sampling V.Ivanchenko |
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53 | // 20/09/00 update fluctuations V.Ivanchenko |
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54 | // 18/10/01 add fluorescence AlongStepDoIt V.Ivanchenko |
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55 | // 18/10/01 Revision to improve code quality and consistency with design, MGP |
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56 | // 19/10/01 update according to new design, V.Ivanchenko |
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57 | // 24/10/01 MGP - Protection against negative energy loss in AlongStepDoIt |
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58 | // 26/10/01 VI Clean up access to deexcitation |
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59 | // 23/11/01 VI Move static member-functions from header to source |
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60 | // 28/05/02 VI Remove flag fStopAndKill |
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61 | // 03/06/02 MGP - Restore fStopAndKill |
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62 | // 28/10/02 VI Optimal binning for dE/dx |
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63 | // 21/01/03 VI cut per region |
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64 | // 01/06/04 VI check if stopped particle has AtRest processes |
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65 | // |
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66 | // -------------------------------------------------------------- |
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67 | |
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68 | #include "G4eLowEnergyLoss.hh" |
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69 | #include "G4EnergyLossMessenger.hh" |
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70 | #include "G4Poisson.hh" |
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71 | #include "G4ProductionCutsTable.hh" |
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72 | |
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73 | // |
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74 | |
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75 | // Initialisation of static data members |
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76 | // ------------------------------------- |
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77 | // Contributing processes : ion.loss + soft brems->NbOfProcesses is initialized |
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78 | // to 2 . YOU DO NOT HAVE TO CHANGE this variable for a 'normal' run. |
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79 | // |
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80 | // You have to change NbOfProcesses if you invent a new process contributing |
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81 | // to the continuous energy loss. |
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82 | // The NbOfProcesses data member can be changed using the (public static) |
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83 | // functions Get/Set/Plus/MinusNbOfProcesses (see G4eLowEnergyLoss.hh) |
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84 | |
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85 | G4int G4eLowEnergyLoss::NbOfProcesses = 2; |
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86 | |
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87 | G4int G4eLowEnergyLoss::CounterOfElectronProcess = 0; |
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88 | G4int G4eLowEnergyLoss::CounterOfPositronProcess = 0; |
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89 | G4PhysicsTable** G4eLowEnergyLoss::RecorderOfElectronProcess = |
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90 | new G4PhysicsTable*[10]; |
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91 | G4PhysicsTable** G4eLowEnergyLoss::RecorderOfPositronProcess = |
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92 | new G4PhysicsTable*[10]; |
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93 | |
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94 | |
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95 | G4PhysicsTable* G4eLowEnergyLoss::theDEDXElectronTable = 0; |
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96 | G4PhysicsTable* G4eLowEnergyLoss::theDEDXPositronTable = 0; |
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97 | G4PhysicsTable* G4eLowEnergyLoss::theRangeElectronTable = 0; |
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98 | G4PhysicsTable* G4eLowEnergyLoss::theRangePositronTable = 0; |
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99 | G4PhysicsTable* G4eLowEnergyLoss::theInverseRangeElectronTable = 0; |
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100 | G4PhysicsTable* G4eLowEnergyLoss::theInverseRangePositronTable = 0; |
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101 | G4PhysicsTable* G4eLowEnergyLoss::theLabTimeElectronTable = 0; |
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102 | G4PhysicsTable* G4eLowEnergyLoss::theLabTimePositronTable = 0; |
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103 | G4PhysicsTable* G4eLowEnergyLoss::theProperTimeElectronTable = 0; |
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104 | G4PhysicsTable* G4eLowEnergyLoss::theProperTimePositronTable = 0; |
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105 | |
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106 | G4PhysicsTable* G4eLowEnergyLoss::theeRangeCoeffATable = 0; |
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107 | G4PhysicsTable* G4eLowEnergyLoss::theeRangeCoeffBTable = 0; |
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108 | G4PhysicsTable* G4eLowEnergyLoss::theeRangeCoeffCTable = 0; |
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109 | G4PhysicsTable* G4eLowEnergyLoss::thepRangeCoeffATable = 0; |
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110 | G4PhysicsTable* G4eLowEnergyLoss::thepRangeCoeffBTable = 0; |
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111 | G4PhysicsTable* G4eLowEnergyLoss::thepRangeCoeffCTable = 0; |
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112 | |
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113 | G4double G4eLowEnergyLoss::LowerBoundEloss = 10.*eV ; |
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114 | G4double G4eLowEnergyLoss::UpperBoundEloss = 100.*GeV ; |
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115 | G4int G4eLowEnergyLoss::NbinEloss = 360 ; |
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116 | G4double G4eLowEnergyLoss::RTable ; |
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117 | G4double G4eLowEnergyLoss::LOGRTable ; |
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118 | |
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119 | |
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120 | G4EnergyLossMessenger* G4eLowEnergyLoss::eLossMessenger = 0; |
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121 | |
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122 | // |
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123 | |
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124 | // constructor and destructor |
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125 | |
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126 | G4eLowEnergyLoss::G4eLowEnergyLoss(const G4String& processName) |
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127 | : G4VeLowEnergyLoss (processName), |
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128 | theLossTable(0), |
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129 | MinKineticEnergy(1.*eV), |
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130 | Charge(-1.), |
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131 | lastCharge(0.), |
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132 | theDEDXTable(0), |
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133 | CounterOfProcess(0), |
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134 | RecorderOfProcess(0), |
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135 | fdEdx(0), |
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136 | fRangeNow(0), |
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137 | linLossLimit(0.05), |
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138 | theFluo(false) |
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139 | { |
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140 | |
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141 | //create (only once) EnergyLoss messenger |
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142 | if(!eLossMessenger) eLossMessenger = new G4EnergyLossMessenger(); |
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143 | } |
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144 | |
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145 | // |
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146 | |
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147 | G4eLowEnergyLoss::~G4eLowEnergyLoss() |
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148 | { |
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149 | if (theLossTable) |
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150 | { |
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151 | theLossTable->clearAndDestroy(); |
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152 | delete theLossTable; |
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153 | } |
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154 | } |
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155 | |
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156 | void G4eLowEnergyLoss::SetNbOfProcesses(G4int nb) |
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157 | { |
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158 | NbOfProcesses=nb; |
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159 | } |
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160 | |
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161 | void G4eLowEnergyLoss::PlusNbOfProcesses() |
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162 | { |
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163 | NbOfProcesses++; |
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164 | } |
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165 | |
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166 | void G4eLowEnergyLoss::MinusNbOfProcesses() |
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167 | { |
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168 | NbOfProcesses--; |
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169 | } |
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170 | |
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171 | G4int G4eLowEnergyLoss::GetNbOfProcesses() |
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172 | { |
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173 | return NbOfProcesses; |
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174 | } |
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175 | |
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176 | void G4eLowEnergyLoss::SetLowerBoundEloss(G4double val) |
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177 | { |
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178 | LowerBoundEloss=val; |
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179 | } |
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180 | |
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181 | void G4eLowEnergyLoss::SetUpperBoundEloss(G4double val) |
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182 | { |
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183 | UpperBoundEloss=val; |
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184 | } |
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185 | |
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186 | void G4eLowEnergyLoss::SetNbinEloss(G4int nb) |
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187 | { |
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188 | NbinEloss=nb; |
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189 | } |
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190 | |
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191 | G4double G4eLowEnergyLoss::GetLowerBoundEloss() |
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192 | { |
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193 | return LowerBoundEloss; |
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194 | } |
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195 | |
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196 | G4double G4eLowEnergyLoss::GetUpperBoundEloss() |
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197 | { |
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198 | return UpperBoundEloss; |
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199 | } |
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200 | |
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201 | G4int G4eLowEnergyLoss::GetNbinEloss() |
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202 | { |
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203 | return NbinEloss; |
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204 | } |
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205 | // |
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206 | |
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207 | void G4eLowEnergyLoss::BuildDEDXTable( |
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208 | const G4ParticleDefinition& aParticleType) |
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209 | { |
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210 | ParticleMass = aParticleType.GetPDGMass(); |
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211 | Charge = aParticleType.GetPDGCharge()/eplus; |
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212 | |
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213 | // calculate data members LOGRTable,RTable first |
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214 | |
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215 | G4double lrate = std::log(UpperBoundEloss/LowerBoundEloss); |
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216 | LOGRTable=lrate/NbinEloss; |
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217 | RTable =std::exp(LOGRTable); |
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218 | // Build energy loss table as a sum of the energy loss due to the |
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219 | // different processes. |
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220 | // |
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221 | |
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222 | const G4ProductionCutsTable* theCoupleTable= |
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223 | G4ProductionCutsTable::GetProductionCutsTable(); |
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224 | size_t numOfCouples = theCoupleTable->GetTableSize(); |
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225 | |
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226 | // create table for the total energy loss |
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227 | |
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228 | if (&aParticleType==G4Electron::Electron()) |
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229 | { |
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230 | RecorderOfProcess=RecorderOfElectronProcess; |
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231 | CounterOfProcess=CounterOfElectronProcess; |
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232 | if (CounterOfProcess == NbOfProcesses) |
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233 | { |
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234 | if (theDEDXElectronTable) |
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235 | { |
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236 | theDEDXElectronTable->clearAndDestroy(); |
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237 | delete theDEDXElectronTable; |
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238 | } |
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239 | theDEDXElectronTable = new G4PhysicsTable(numOfCouples); |
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240 | theDEDXTable = theDEDXElectronTable; |
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241 | } |
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242 | } |
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243 | if (&aParticleType==G4Positron::Positron()) |
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244 | { |
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245 | RecorderOfProcess=RecorderOfPositronProcess; |
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246 | CounterOfProcess=CounterOfPositronProcess; |
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247 | if (CounterOfProcess == NbOfProcesses) |
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248 | { |
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249 | if (theDEDXPositronTable) |
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250 | { |
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251 | theDEDXPositronTable->clearAndDestroy(); |
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252 | delete theDEDXPositronTable; |
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253 | } |
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254 | theDEDXPositronTable = new G4PhysicsTable(numOfCouples); |
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255 | theDEDXTable = theDEDXPositronTable; |
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256 | } |
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257 | } |
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258 | |
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259 | if (CounterOfProcess == NbOfProcesses) |
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260 | { |
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261 | // fill the tables |
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262 | // loop for materials |
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263 | G4double LowEdgeEnergy , Value; |
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264 | G4bool isOutRange; |
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265 | G4PhysicsTable* pointer; |
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266 | |
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267 | for (size_t J=0; J<numOfCouples; J++) |
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268 | { |
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269 | // create physics vector and fill it |
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270 | |
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271 | G4PhysicsLogVector* aVector = new G4PhysicsLogVector( |
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272 | LowerBoundEloss, UpperBoundEloss, NbinEloss); |
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273 | |
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274 | // loop for the kinetic energy |
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275 | for (G4int i=0; i<NbinEloss; i++) |
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276 | { |
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277 | LowEdgeEnergy = aVector->GetLowEdgeEnergy(i) ; |
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278 | //here comes the sum of the different tables created by the |
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279 | //processes (ionisation,bremsstrahlung,etc...) |
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280 | Value = 0.; |
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281 | for (G4int process=0; process < NbOfProcesses; process++) |
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282 | { |
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283 | pointer= RecorderOfProcess[process]; |
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284 | Value += (*pointer)[J]->GetValue(LowEdgeEnergy,isOutRange); |
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285 | } |
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286 | |
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287 | aVector->PutValue(i,Value) ; |
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288 | } |
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289 | |
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290 | theDEDXTable->insert(aVector) ; |
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291 | |
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292 | } |
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293 | |
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294 | |
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295 | //reset counter to zero |
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296 | if (&aParticleType==G4Electron::Electron()) CounterOfElectronProcess=0; |
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297 | if (&aParticleType==G4Positron::Positron()) CounterOfPositronProcess=0; |
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298 | |
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299 | ParticleMass = aParticleType.GetPDGMass(); |
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300 | |
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301 | if (&aParticleType==G4Electron::Electron()) |
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302 | { |
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303 | // Build range table |
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304 | theRangeElectronTable = BuildRangeTable(theDEDXElectronTable, |
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305 | theRangeElectronTable, |
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306 | LowerBoundEloss,UpperBoundEloss,NbinEloss); |
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307 | |
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308 | // Build lab/proper time tables |
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309 | theLabTimeElectronTable = BuildLabTimeTable(theDEDXElectronTable, |
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310 | theLabTimeElectronTable, |
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311 | LowerBoundEloss,UpperBoundEloss,NbinEloss); |
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312 | theProperTimeElectronTable = BuildProperTimeTable(theDEDXElectronTable, |
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313 | theProperTimeElectronTable, |
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314 | LowerBoundEloss,UpperBoundEloss,NbinEloss); |
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315 | |
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316 | // Build coeff tables for the energy loss calculation |
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317 | theeRangeCoeffATable = BuildRangeCoeffATable(theRangeElectronTable, |
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318 | theeRangeCoeffATable, |
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319 | LowerBoundEloss,UpperBoundEloss,NbinEloss); |
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320 | |
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321 | theeRangeCoeffBTable = BuildRangeCoeffBTable(theRangeElectronTable, |
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322 | theeRangeCoeffBTable, |
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323 | LowerBoundEloss,UpperBoundEloss,NbinEloss); |
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324 | |
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325 | theeRangeCoeffCTable = BuildRangeCoeffCTable(theRangeElectronTable, |
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326 | theeRangeCoeffCTable, |
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327 | LowerBoundEloss,UpperBoundEloss,NbinEloss); |
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328 | |
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329 | // invert the range table |
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330 | theInverseRangeElectronTable = BuildInverseRangeTable(theRangeElectronTable, |
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331 | theeRangeCoeffATable, |
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332 | theeRangeCoeffBTable, |
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333 | theeRangeCoeffCTable, |
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334 | theInverseRangeElectronTable, |
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335 | LowerBoundEloss,UpperBoundEloss,NbinEloss); |
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336 | } |
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337 | if (&aParticleType==G4Positron::Positron()) |
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338 | { |
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339 | // Build range table |
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340 | theRangePositronTable = BuildRangeTable(theDEDXPositronTable, |
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341 | theRangePositronTable, |
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342 | LowerBoundEloss,UpperBoundEloss,NbinEloss); |
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343 | |
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344 | |
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345 | // Build lab/proper time tables |
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346 | theLabTimePositronTable = BuildLabTimeTable(theDEDXPositronTable, |
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347 | theLabTimePositronTable, |
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348 | LowerBoundEloss,UpperBoundEloss,NbinEloss); |
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349 | theProperTimePositronTable = BuildProperTimeTable(theDEDXPositronTable, |
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350 | theProperTimePositronTable, |
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351 | LowerBoundEloss,UpperBoundEloss,NbinEloss); |
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352 | |
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353 | // Build coeff tables for the energy loss calculation |
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354 | thepRangeCoeffATable = BuildRangeCoeffATable(theRangePositronTable, |
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355 | thepRangeCoeffATable, |
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356 | LowerBoundEloss,UpperBoundEloss,NbinEloss); |
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357 | |
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358 | thepRangeCoeffBTable = BuildRangeCoeffBTable(theRangePositronTable, |
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359 | thepRangeCoeffBTable, |
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360 | LowerBoundEloss,UpperBoundEloss,NbinEloss); |
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361 | |
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362 | thepRangeCoeffCTable = BuildRangeCoeffCTable(theRangePositronTable, |
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363 | thepRangeCoeffCTable, |
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364 | LowerBoundEloss,UpperBoundEloss,NbinEloss); |
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365 | |
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366 | // invert the range table |
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367 | theInverseRangePositronTable = BuildInverseRangeTable(theRangePositronTable, |
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368 | thepRangeCoeffATable, |
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369 | thepRangeCoeffBTable, |
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370 | thepRangeCoeffCTable, |
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371 | theInverseRangePositronTable, |
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372 | LowerBoundEloss,UpperBoundEloss,NbinEloss); |
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373 | } |
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374 | |
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375 | if(verboseLevel > 1) { |
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376 | G4cout << (*theDEDXElectronTable) << G4endl; |
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377 | } |
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378 | |
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379 | |
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380 | // make the energy loss and the range table available |
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381 | G4EnergyLossTables::Register(&aParticleType, |
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382 | (&aParticleType==G4Electron::Electron())? |
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383 | theDEDXElectronTable: theDEDXPositronTable, |
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384 | (&aParticleType==G4Electron::Electron())? |
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385 | theRangeElectronTable: theRangePositronTable, |
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386 | (&aParticleType==G4Electron::Electron())? |
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387 | theInverseRangeElectronTable: theInverseRangePositronTable, |
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388 | (&aParticleType==G4Electron::Electron())? |
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389 | theLabTimeElectronTable: theLabTimePositronTable, |
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390 | (&aParticleType==G4Electron::Electron())? |
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391 | theProperTimeElectronTable: theProperTimePositronTable, |
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392 | LowerBoundEloss, UpperBoundEloss, 1.,NbinEloss); |
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393 | } |
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394 | } |
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395 | |
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396 | // |
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397 | |
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398 | G4VParticleChange* G4eLowEnergyLoss::AlongStepDoIt( const G4Track& trackData, |
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399 | const G4Step& stepData) |
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400 | { |
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401 | // compute the energy loss after a Step |
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402 | |
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403 | static const G4double faclow = 1.5 ; |
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404 | |
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405 | // get particle and material pointers from trackData |
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406 | const G4DynamicParticle* aParticle = trackData.GetDynamicParticle(); |
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407 | G4double E = aParticle->GetKineticEnergy(); |
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408 | |
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409 | const G4MaterialCutsCouple* couple = trackData.GetMaterialCutsCouple(); |
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410 | |
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411 | G4double Step = stepData.GetStepLength(); |
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412 | |
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413 | aParticleChange.Initialize(trackData); |
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414 | //fParticleChange.Initialize(trackData); |
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415 | |
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416 | G4double MeanLoss, finalT; |
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417 | |
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418 | if (E < MinKineticEnergy) finalT = 0.; |
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419 | |
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420 | else if ( E< faclow*LowerBoundEloss) |
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421 | { |
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422 | if (Step >= fRangeNow) finalT = 0.; |
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423 | // else finalT = E*(1.-Step/fRangeNow) ; |
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424 | else finalT = E*(1.-std::sqrt(Step/fRangeNow)) ; |
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425 | } |
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426 | |
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427 | else if (E>=UpperBoundEloss) finalT = E - Step*fdEdx; |
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428 | |
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429 | else if (Step >= fRangeNow) finalT = 0.; |
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430 | |
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431 | else |
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432 | { |
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433 | if(Step/fRangeNow < linLossLimit) finalT = E-Step*fdEdx ; |
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434 | else |
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435 | { |
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436 | if (Charge<0.) finalT = G4EnergyLossTables::GetPreciseEnergyFromRange |
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437 | (G4Electron::Electron(),fRangeNow-Step,couple); |
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438 | else finalT = G4EnergyLossTables::GetPreciseEnergyFromRange |
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439 | (G4Positron::Positron(),fRangeNow-Step,couple); |
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440 | } |
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441 | } |
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442 | |
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443 | if(finalT < MinKineticEnergy) finalT = 0. ; |
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444 | |
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445 | MeanLoss = E-finalT ; |
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446 | |
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447 | //now the loss with fluctuation |
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448 | if ((EnlossFlucFlag) && (finalT > 0.) && (finalT < E)&&(E > LowerBoundEloss)) |
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449 | { |
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450 | finalT = E-GetLossWithFluct(aParticle,couple,MeanLoss,Step); |
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451 | if (finalT < 0.) finalT = 0.; |
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452 | } |
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453 | |
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454 | // kill the particle if the kinetic energy <= 0 |
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455 | if (finalT <= 0. ) |
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456 | { |
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457 | finalT = 0.; |
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458 | if(Charge > 0.0) aParticleChange.ProposeTrackStatus(fStopButAlive); |
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459 | else aParticleChange.ProposeTrackStatus(fStopAndKill); |
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460 | } |
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461 | |
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462 | G4double edep = E - finalT; |
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463 | |
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464 | aParticleChange.ProposeEnergy(finalT); |
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465 | |
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466 | // Deexcitation of ionised atoms |
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467 | std::vector<G4DynamicParticle*>* deexcitationProducts = 0; |
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468 | if (theFluo) deexcitationProducts = DeexciteAtom(couple,E,edep); |
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469 | |
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470 | size_t nSecondaries = 0; |
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471 | if (deexcitationProducts != 0) nSecondaries = deexcitationProducts->size(); |
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472 | aParticleChange.SetNumberOfSecondaries(nSecondaries); |
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473 | |
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474 | if (nSecondaries > 0) { |
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475 | |
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476 | const G4StepPoint* preStep = stepData.GetPreStepPoint(); |
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477 | const G4StepPoint* postStep = stepData.GetPostStepPoint(); |
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478 | G4ThreeVector r = preStep->GetPosition(); |
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479 | G4ThreeVector deltaR = postStep->GetPosition(); |
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480 | deltaR -= r; |
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481 | G4double t = preStep->GetGlobalTime(); |
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482 | G4double deltaT = postStep->GetGlobalTime(); |
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483 | deltaT -= t; |
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484 | G4double time, q; |
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485 | G4ThreeVector position; |
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486 | |
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487 | for (size_t i=0; i<nSecondaries; i++) { |
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488 | |
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489 | G4DynamicParticle* part = (*deexcitationProducts)[i]; |
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490 | if (part != 0) { |
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491 | G4double eSecondary = part->GetKineticEnergy(); |
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492 | edep -= eSecondary; |
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493 | if (edep > 0.) |
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494 | { |
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495 | q = G4UniformRand(); |
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496 | time = deltaT*q + t; |
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497 | position = deltaR*q; |
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498 | position += r; |
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499 | G4Track* newTrack = new G4Track(part, time, position); |
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500 | aParticleChange.AddSecondary(newTrack); |
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501 | } |
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502 | else |
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503 | { |
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504 | edep += eSecondary; |
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505 | delete part; |
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506 | part = 0; |
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507 | } |
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508 | } |
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509 | } |
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510 | } |
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511 | delete deexcitationProducts; |
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512 | |
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513 | aParticleChange.ProposeLocalEnergyDeposit(edep); |
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514 | |
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515 | return &aParticleChange; |
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516 | } |
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517 | |
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518 | // |
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519 | |
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