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: G4Scintillation.cc,v 1.38 2010/12/15 07:39:26 gunter Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-04-ref-00 $ |
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29 | // |
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30 | //////////////////////////////////////////////////////////////////////// |
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31 | // Scintillation Light Class Implementation |
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32 | //////////////////////////////////////////////////////////////////////// |
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33 | // |
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34 | // File: G4Scintillation.cc |
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35 | // Description: RestDiscrete Process - Generation of Scintillation Photons |
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36 | // Version: 1.0 |
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37 | // Created: 1998-11-07 |
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38 | // Author: Peter Gumplinger |
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39 | // Updated: 2010-10-20 Allow the scintillation yield to be a function |
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40 | // of energy deposited by particle type |
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41 | // Thanks to Zach Hartwig (Department of Nuclear |
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42 | // Science and Engineeering - MIT) |
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43 | // 2010-09-22 by Peter Gumplinger |
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44 | // > scintillation rise time included, thanks to |
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45 | // > Martin Goettlich/DESY |
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46 | // 2005-08-17 by Peter Gumplinger |
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47 | // > change variable name MeanNumPhotons -> MeanNumberOfPhotons |
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48 | // 2005-07-28 by Peter Gumplinger |
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49 | // > add G4ProcessType to constructor |
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50 | // 2004-08-05 by Peter Gumplinger |
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51 | // > changed StronglyForced back to Forced in GetMeanLifeTime |
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52 | // 2002-11-21 by Peter Gumplinger |
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53 | // > change to use G4Poisson for small MeanNumberOfPhotons |
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54 | // 2002-11-07 by Peter Gumplinger |
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55 | // > now allow for fast and slow scintillation component |
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56 | // 2002-11-05 by Peter Gumplinger |
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57 | // > now use scintillation constants from G4Material |
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58 | // 2002-05-09 by Peter Gumplinger |
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59 | // > use only the PostStepPoint location for the origin of |
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60 | // scintillation photons when energy is lost to the medium |
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61 | // by a neutral particle |
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62 | // 2000-09-18 by Peter Gumplinger |
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63 | // > change: aSecondaryPosition=x0+rand*aStep.GetDeltaPosition(); |
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64 | // aSecondaryTrack->SetTouchable(0); |
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65 | // 2001-09-17, migration of Materials to pure STL (mma) |
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66 | // 2003-06-03, V.Ivanchenko fix compilation warnings |
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67 | // |
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68 | // mail: gum@triumf.ca |
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69 | // |
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70 | //////////////////////////////////////////////////////////////////////// |
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71 | |
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72 | #include "G4ios.hh" |
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73 | #include "G4ParticleTypes.hh" |
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74 | #include "G4EmProcessSubType.hh" |
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75 | |
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76 | #include "G4Scintillation.hh" |
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77 | |
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78 | ///////////////////////// |
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79 | // Class Implementation |
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80 | ///////////////////////// |
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81 | |
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82 | ////////////// |
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83 | // Operators |
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84 | ////////////// |
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85 | |
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86 | // G4Scintillation::operator=(const G4Scintillation &right) |
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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 | // Constructors |
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92 | ///////////////// |
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93 | |
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94 | G4Scintillation::G4Scintillation(const G4String& processName, |
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95 | G4ProcessType type) |
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96 | : G4VRestDiscreteProcess(processName, type) |
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97 | { |
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98 | SetProcessSubType(fScintillation); |
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99 | |
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100 | fTrackSecondariesFirst = false; |
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101 | fFiniteRiseTime = false; |
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102 | |
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103 | YieldFactor = 1.0; |
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104 | ExcitationRatio = 1.0; |
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105 | |
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106 | scintillationByParticleType = false; |
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107 | |
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108 | theFastIntegralTable = NULL; |
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109 | theSlowIntegralTable = NULL; |
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110 | |
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111 | if (verboseLevel>0) { |
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112 | G4cout << GetProcessName() << " is created " << G4endl; |
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113 | } |
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114 | |
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115 | BuildThePhysicsTable(); |
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116 | |
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117 | emSaturation = NULL; |
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118 | } |
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119 | |
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120 | //////////////// |
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121 | // Destructors |
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122 | //////////////// |
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123 | |
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124 | G4Scintillation::~G4Scintillation() |
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125 | { |
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126 | if (theFastIntegralTable != NULL) { |
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127 | theFastIntegralTable->clearAndDestroy(); |
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128 | delete theFastIntegralTable; |
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129 | } |
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130 | if (theSlowIntegralTable != NULL) { |
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131 | theSlowIntegralTable->clearAndDestroy(); |
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132 | delete theSlowIntegralTable; |
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133 | } |
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134 | } |
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135 | |
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136 | //////////// |
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137 | // Methods |
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138 | //////////// |
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139 | |
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140 | // AtRestDoIt |
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141 | // ---------- |
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142 | // |
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143 | G4VParticleChange* |
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144 | G4Scintillation::AtRestDoIt(const G4Track& aTrack, const G4Step& aStep) |
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145 | |
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146 | // This routine simply calls the equivalent PostStepDoIt since all the |
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147 | // necessary information resides in aStep.GetTotalEnergyDeposit() |
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148 | |
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149 | { |
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150 | return G4Scintillation::PostStepDoIt(aTrack, aStep); |
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151 | } |
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152 | |
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153 | // PostStepDoIt |
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154 | // ------------- |
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155 | // |
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156 | G4VParticleChange* |
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157 | G4Scintillation::PostStepDoIt(const G4Track& aTrack, const G4Step& aStep) |
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158 | |
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159 | // This routine is called for each tracking step of a charged particle |
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160 | // in a scintillator. A Poisson/Gauss-distributed number of photons is |
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161 | // generated according to the scintillation yield formula, distributed |
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162 | // evenly along the track segment and uniformly into 4pi. |
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163 | |
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164 | { |
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165 | aParticleChange.Initialize(aTrack); |
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166 | |
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167 | const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle(); |
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168 | const G4Material* aMaterial = aTrack.GetMaterial(); |
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169 | |
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170 | G4StepPoint* pPreStepPoint = aStep.GetPreStepPoint(); |
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171 | G4StepPoint* pPostStepPoint = aStep.GetPostStepPoint(); |
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172 | |
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173 | G4ThreeVector x0 = pPreStepPoint->GetPosition(); |
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174 | G4ThreeVector p0 = aStep.GetDeltaPosition().unit(); |
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175 | G4double t0 = pPreStepPoint->GetGlobalTime(); |
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176 | |
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177 | G4double TotalEnergyDeposit = aStep.GetTotalEnergyDeposit(); |
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178 | |
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179 | G4MaterialPropertiesTable* aMaterialPropertiesTable = |
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180 | aMaterial->GetMaterialPropertiesTable(); |
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181 | if (!aMaterialPropertiesTable) |
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182 | return G4VRestDiscreteProcess::PostStepDoIt(aTrack, aStep); |
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183 | |
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184 | const G4MaterialPropertyVector* Fast_Intensity = |
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185 | aMaterialPropertiesTable->GetProperty("FASTCOMPONENT"); |
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186 | const G4MaterialPropertyVector* Slow_Intensity = |
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187 | aMaterialPropertiesTable->GetProperty("SLOWCOMPONENT"); |
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188 | |
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189 | if (!Fast_Intensity && !Slow_Intensity ) |
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190 | return G4VRestDiscreteProcess::PostStepDoIt(aTrack, aStep); |
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191 | |
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192 | G4int nscnt = 1; |
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193 | if (Fast_Intensity && Slow_Intensity) nscnt = 2; |
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194 | |
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195 | G4double ScintillationYield = 0.; |
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196 | |
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197 | if (scintillationByParticleType) { |
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198 | // The scintillation response is a function of the energy |
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199 | // deposited by particle types. |
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200 | |
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201 | // Get the definition of the current particle |
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202 | G4ParticleDefinition *pDef = aParticle->GetDefinition(); |
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203 | const G4MaterialPropertyVector *Scint_Yield_Vector = NULL; |
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204 | |
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205 | // Obtain the G4MaterialPropertyVectory containing the |
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206 | // scintillation light yield as a function of the deposited |
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207 | // energy for the current particle type |
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208 | |
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209 | // Protons |
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210 | if(pDef==G4Proton::ProtonDefinition()) |
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211 | Scint_Yield_Vector = aMaterialPropertiesTable-> |
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212 | GetProperty("PROTONSCINTILLATIONYIELD"); |
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213 | |
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214 | // Deuterons |
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215 | else if(pDef==G4Deuteron::DeuteronDefinition()) |
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216 | Scint_Yield_Vector = aMaterialPropertiesTable-> |
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217 | GetProperty("DEUTERONSCINTILLATIONYIELD"); |
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218 | |
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219 | // Tritons |
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220 | else if(pDef==G4Triton::TritonDefinition()) |
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221 | Scint_Yield_Vector = aMaterialPropertiesTable-> |
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222 | GetProperty("TRITONSCINTILLATIONYIELD"); |
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223 | |
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224 | // Alphas |
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225 | else if(pDef==G4Alpha::AlphaDefinition()) |
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226 | Scint_Yield_Vector = aMaterialPropertiesTable-> |
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227 | GetProperty("ALPHASCINTILLATIONYIELD"); |
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228 | |
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229 | // Ions (particles derived from G4VIon and G4Ions) |
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230 | // and recoil ions below tracking cut from neutrons after hElastic |
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231 | else if(pDef->GetParticleType()== "nucleus" || |
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232 | pDef==G4Neutron::NeutronDefinition()) |
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233 | Scint_Yield_Vector = aMaterialPropertiesTable-> |
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234 | GetProperty("IONSCINTILLATIONYIELD"); |
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235 | |
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236 | // Electrons (must also account for shell-binding energy |
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237 | // attributed to gamma from standard PhotoElectricEffect) |
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238 | else if(pDef==G4Electron::ElectronDefinition() || |
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239 | pDef==G4Gamma::GammaDefinition()) |
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240 | Scint_Yield_Vector = aMaterialPropertiesTable-> |
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241 | GetProperty("ELECTRONSCINTILLATIONYIELD"); |
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242 | |
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243 | // Default for particles not enumerated/listed above |
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244 | else |
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245 | Scint_Yield_Vector = aMaterialPropertiesTable-> |
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246 | GetProperty("ELECTRONSCINTILLATIONYIELD"); |
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247 | |
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248 | // If the user has not specified yields for (p,d,t,a,carbon) |
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249 | // then these unspecified particles will default to the |
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250 | // electron's scintillation yield |
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251 | if(!Scint_Yield_Vector){ |
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252 | Scint_Yield_Vector = aMaterialPropertiesTable-> |
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253 | GetProperty("ELECTRONSCINTILLATIONYIELD"); |
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254 | } |
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255 | |
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256 | // Throw an exception if no scintillation yield is found |
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257 | if (!Scint_Yield_Vector) { |
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258 | G4cerr << "\nG4Scintillation::PostStepDoIt(): " |
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259 | << "Request for scintillation yield for energy deposit and particle type without correct entry in MaterialPropertiesTable\n" |
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260 | << "ScintillationByParticleType requires at minimum that ELECTRONSCINTILLATIONYIELD is set by the user\n" |
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261 | << G4endl; |
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262 | G4Exception("G4Scintillation::PostStepDoIt", |
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263 | "No correct entry in MaterialPropertiesTable", |
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264 | FatalException,"Missing MaterialPropertiesTable entry."); |
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265 | } |
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266 | |
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267 | if (verboseLevel>1) { |
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268 | G4cout << "\n" |
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269 | << "Particle = " << pDef->GetParticleName() << "\n" |
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270 | << "Energy Dep. = " << TotalEnergyDeposit/MeV << "\n" |
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271 | << "Yield = " |
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272 | << Scint_Yield_Vector->GetProperty(TotalEnergyDeposit) |
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273 | << "\n" << G4endl; |
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274 | } |
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275 | |
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276 | // Obtain the scintillation yield using the total energy |
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277 | // deposited by the particle in this step. |
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278 | |
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279 | // Units: [# scintillation photons] |
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280 | ScintillationYield = Scint_Yield_Vector-> |
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281 | GetProperty(TotalEnergyDeposit); |
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282 | } else { |
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283 | // The default linear scintillation process |
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284 | ScintillationYield = aMaterialPropertiesTable-> |
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285 | GetConstProperty("SCINTILLATIONYIELD"); |
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286 | |
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287 | // Units: [# scintillation photons / MeV] |
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288 | ScintillationYield *= YieldFactor; |
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289 | } |
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290 | |
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291 | G4double ResolutionScale = aMaterialPropertiesTable-> |
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292 | GetConstProperty("RESOLUTIONSCALE"); |
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293 | |
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294 | // Birks law saturation: |
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295 | |
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296 | G4double constBirks = 0.0; |
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297 | |
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298 | constBirks = aMaterial->GetIonisation()->GetBirksConstant(); |
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299 | |
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300 | G4double MeanNumberOfPhotons; |
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301 | |
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302 | // Birk's correction via emSaturation and specifying scintillation by |
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303 | // by particle type are physically mutually exclusive |
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304 | |
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305 | if (scintillationByParticleType) |
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306 | MeanNumberOfPhotons = ScintillationYield; |
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307 | else if (emSaturation) |
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308 | MeanNumberOfPhotons = ScintillationYield* |
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309 | (emSaturation->VisibleEnergyDeposition(&aStep)); |
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310 | else |
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311 | MeanNumberOfPhotons = ScintillationYield*TotalEnergyDeposit; |
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312 | |
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313 | G4int NumPhotons; |
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314 | |
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315 | if (MeanNumberOfPhotons > 10.) |
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316 | { |
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317 | G4double sigma = ResolutionScale * std::sqrt(MeanNumberOfPhotons); |
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318 | NumPhotons = G4int(G4RandGauss::shoot(MeanNumberOfPhotons,sigma)+0.5); |
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319 | } |
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320 | else |
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321 | { |
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322 | NumPhotons = G4int(G4Poisson(MeanNumberOfPhotons)); |
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323 | } |
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324 | |
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325 | if (NumPhotons <= 0) |
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326 | { |
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327 | // return unchanged particle and no secondaries |
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328 | |
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329 | aParticleChange.SetNumberOfSecondaries(0); |
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330 | |
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331 | return G4VRestDiscreteProcess::PostStepDoIt(aTrack, aStep); |
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332 | } |
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333 | |
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334 | //////////////////////////////////////////////////////////////// |
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335 | |
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336 | aParticleChange.SetNumberOfSecondaries(NumPhotons); |
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337 | |
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338 | if (fTrackSecondariesFirst) { |
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339 | if (aTrack.GetTrackStatus() == fAlive ) |
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340 | aParticleChange.ProposeTrackStatus(fSuspend); |
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341 | } |
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342 | |
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343 | //////////////////////////////////////////////////////////////// |
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344 | |
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345 | G4int materialIndex = aMaterial->GetIndex(); |
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346 | |
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347 | // Retrieve the Scintillation Integral for this material |
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348 | // new G4PhysicsOrderedFreeVector allocated to hold CII's |
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349 | |
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350 | G4int Num = NumPhotons; |
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351 | |
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352 | for (G4int scnt = 1; scnt <= nscnt; scnt++) { |
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353 | |
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354 | G4double ScintillationTime = 0.*ns; |
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355 | G4double ScintillationRiseTime = 0.*ns; |
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356 | G4PhysicsOrderedFreeVector* ScintillationIntegral = NULL; |
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357 | |
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358 | if (scnt == 1) { |
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359 | if (nscnt == 1) { |
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360 | if(Fast_Intensity){ |
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361 | ScintillationTime = aMaterialPropertiesTable-> |
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362 | GetConstProperty("FASTTIMECONSTANT"); |
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363 | if (fFiniteRiseTime) { |
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364 | ScintillationRiseTime = aMaterialPropertiesTable-> |
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365 | GetConstProperty("FASTSCINTILLATIONRISETIME"); |
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366 | } |
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367 | ScintillationIntegral = |
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368 | (G4PhysicsOrderedFreeVector*)((*theFastIntegralTable)(materialIndex)); |
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369 | } |
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370 | if(Slow_Intensity){ |
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371 | ScintillationTime = aMaterialPropertiesTable-> |
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372 | GetConstProperty("SLOWTIMECONSTANT"); |
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373 | if (fFiniteRiseTime) { |
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374 | ScintillationRiseTime = aMaterialPropertiesTable-> |
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375 | GetConstProperty("SLOWSCINTILLATIONRISETIME"); |
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376 | } |
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377 | ScintillationIntegral = |
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378 | (G4PhysicsOrderedFreeVector*)((*theSlowIntegralTable)(materialIndex)); |
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379 | } |
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380 | } |
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381 | else { |
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382 | G4double YieldRatio = aMaterialPropertiesTable-> |
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383 | GetConstProperty("YIELDRATIO"); |
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384 | if ( ExcitationRatio == 1.0 ) { |
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385 | Num = G4int (std::min(YieldRatio,1.0) * NumPhotons); |
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386 | } |
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387 | else { |
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388 | Num = G4int (std::min(ExcitationRatio,1.0) * NumPhotons); |
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389 | } |
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390 | ScintillationTime = aMaterialPropertiesTable-> |
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391 | GetConstProperty("FASTTIMECONSTANT"); |
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392 | if (fFiniteRiseTime) { |
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393 | ScintillationRiseTime = aMaterialPropertiesTable-> |
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394 | GetConstProperty("FASTSCINTILLATIONRISETIME"); |
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395 | } |
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396 | ScintillationIntegral = |
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397 | (G4PhysicsOrderedFreeVector*)((*theFastIntegralTable)(materialIndex)); |
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398 | } |
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399 | } |
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400 | else { |
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401 | Num = NumPhotons - Num; |
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402 | ScintillationTime = aMaterialPropertiesTable-> |
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403 | GetConstProperty("SLOWTIMECONSTANT"); |
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404 | if (fFiniteRiseTime) { |
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405 | ScintillationRiseTime = aMaterialPropertiesTable-> |
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406 | GetConstProperty("SLOWSCINTILLATIONRISETIME"); |
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407 | } |
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408 | ScintillationIntegral = |
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409 | (G4PhysicsOrderedFreeVector*)((*theSlowIntegralTable)(materialIndex)); |
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410 | } |
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411 | |
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412 | if (!ScintillationIntegral) continue; |
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413 | |
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414 | // Max Scintillation Integral |
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415 | |
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416 | G4double CIImax = ScintillationIntegral->GetMaxValue(); |
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417 | |
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418 | for (G4int i = 0; i < Num; i++) { |
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419 | |
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420 | // Determine photon energy |
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421 | |
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422 | G4double CIIvalue = G4UniformRand()*CIImax; |
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423 | G4double sampledEnergy = |
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424 | ScintillationIntegral->GetEnergy(CIIvalue); |
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425 | |
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426 | if (verboseLevel>1) { |
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427 | G4cout << "sampledEnergy = " << sampledEnergy << G4endl; |
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428 | G4cout << "CIIvalue = " << CIIvalue << G4endl; |
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429 | } |
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430 | |
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431 | // Generate random photon direction |
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432 | |
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433 | G4double cost = 1. - 2.*G4UniformRand(); |
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434 | G4double sint = std::sqrt((1.-cost)*(1.+cost)); |
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435 | |
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436 | G4double phi = twopi*G4UniformRand(); |
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437 | G4double sinp = std::sin(phi); |
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438 | G4double cosp = std::cos(phi); |
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439 | |
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440 | G4double px = sint*cosp; |
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441 | G4double py = sint*sinp; |
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442 | G4double pz = cost; |
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443 | |
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444 | // Create photon momentum direction vector |
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445 | |
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446 | G4ParticleMomentum photonMomentum(px, py, pz); |
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447 | |
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448 | // Determine polarization of new photon |
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449 | |
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450 | G4double sx = cost*cosp; |
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451 | G4double sy = cost*sinp; |
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452 | G4double sz = -sint; |
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453 | |
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454 | G4ThreeVector photonPolarization(sx, sy, sz); |
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455 | |
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456 | G4ThreeVector perp = photonMomentum.cross(photonPolarization); |
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457 | |
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458 | phi = twopi*G4UniformRand(); |
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459 | sinp = std::sin(phi); |
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460 | cosp = std::cos(phi); |
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461 | |
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462 | photonPolarization = cosp * photonPolarization + sinp * perp; |
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463 | |
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464 | photonPolarization = photonPolarization.unit(); |
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465 | |
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466 | // Generate a new photon: |
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467 | |
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468 | G4DynamicParticle* aScintillationPhoton = |
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469 | new G4DynamicParticle(G4OpticalPhoton::OpticalPhoton(), |
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470 | photonMomentum); |
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471 | aScintillationPhoton->SetPolarization |
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472 | (photonPolarization.x(), |
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473 | photonPolarization.y(), |
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474 | photonPolarization.z()); |
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475 | |
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476 | aScintillationPhoton->SetKineticEnergy(sampledEnergy); |
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477 | |
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478 | // Generate new G4Track object: |
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479 | |
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480 | G4double rand; |
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481 | |
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482 | if (aParticle->GetDefinition()->GetPDGCharge() != 0) { |
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483 | rand = G4UniformRand(); |
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484 | } else { |
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485 | rand = 1.0; |
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486 | } |
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487 | |
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488 | G4double delta = rand * aStep.GetStepLength(); |
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489 | G4double deltaTime = delta / |
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490 | ((pPreStepPoint->GetVelocity()+ |
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491 | pPostStepPoint->GetVelocity())/2.); |
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492 | |
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493 | // emission time distribution |
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494 | if (ScintillationRiseTime==0.0) { |
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495 | deltaTime = deltaTime - |
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496 | ScintillationTime * std::log( G4UniformRand() ); |
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497 | } else { |
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498 | deltaTime = deltaTime + |
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499 | sample_time(ScintillationRiseTime, ScintillationTime); |
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500 | } |
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501 | |
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502 | G4double aSecondaryTime = t0 + deltaTime; |
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503 | |
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504 | G4ThreeVector aSecondaryPosition = |
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505 | x0 + rand * aStep.GetDeltaPosition(); |
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506 | |
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507 | G4Track* aSecondaryTrack = |
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508 | new G4Track(aScintillationPhoton,aSecondaryTime,aSecondaryPosition); |
---|
509 | |
---|
510 | aSecondaryTrack->SetTouchableHandle( |
---|
511 | aStep.GetPreStepPoint()->GetTouchableHandle()); |
---|
512 | // aSecondaryTrack->SetTouchableHandle((G4VTouchable*)0); |
---|
513 | |
---|
514 | aSecondaryTrack->SetParentID(aTrack.GetTrackID()); |
---|
515 | |
---|
516 | aParticleChange.AddSecondary(aSecondaryTrack); |
---|
517 | |
---|
518 | } |
---|
519 | } |
---|
520 | |
---|
521 | if (verboseLevel>0) { |
---|
522 | G4cout << "\n Exiting from G4Scintillation::DoIt -- NumberOfSecondaries = " |
---|
523 | << aParticleChange.GetNumberOfSecondaries() << G4endl; |
---|
524 | } |
---|
525 | |
---|
526 | return G4VRestDiscreteProcess::PostStepDoIt(aTrack, aStep); |
---|
527 | } |
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528 | |
---|
529 | // BuildThePhysicsTable for the scintillation process |
---|
530 | // -------------------------------------------------- |
---|
531 | // |
---|
532 | |
---|
533 | void G4Scintillation::BuildThePhysicsTable() |
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534 | { |
---|
535 | if (theFastIntegralTable && theSlowIntegralTable) return; |
---|
536 | |
---|
537 | const G4MaterialTable* theMaterialTable = |
---|
538 | G4Material::GetMaterialTable(); |
---|
539 | G4int numOfMaterials = G4Material::GetNumberOfMaterials(); |
---|
540 | |
---|
541 | // create new physics table |
---|
542 | |
---|
543 | if(!theFastIntegralTable)theFastIntegralTable = new G4PhysicsTable(numOfMaterials); |
---|
544 | if(!theSlowIntegralTable)theSlowIntegralTable = new G4PhysicsTable(numOfMaterials); |
---|
545 | |
---|
546 | // loop for materials |
---|
547 | |
---|
548 | for (G4int i=0 ; i < numOfMaterials; i++) |
---|
549 | { |
---|
550 | G4PhysicsOrderedFreeVector* aPhysicsOrderedFreeVector = |
---|
551 | new G4PhysicsOrderedFreeVector(); |
---|
552 | G4PhysicsOrderedFreeVector* bPhysicsOrderedFreeVector = |
---|
553 | new G4PhysicsOrderedFreeVector(); |
---|
554 | |
---|
555 | // Retrieve vector of scintillation wavelength intensity for |
---|
556 | // the material from the material's optical properties table. |
---|
557 | |
---|
558 | G4Material* aMaterial = (*theMaterialTable)[i]; |
---|
559 | |
---|
560 | G4MaterialPropertiesTable* aMaterialPropertiesTable = |
---|
561 | aMaterial->GetMaterialPropertiesTable(); |
---|
562 | |
---|
563 | if (aMaterialPropertiesTable) { |
---|
564 | |
---|
565 | G4MaterialPropertyVector* theFastLightVector = |
---|
566 | aMaterialPropertiesTable->GetProperty("FASTCOMPONENT"); |
---|
567 | |
---|
568 | if (theFastLightVector) { |
---|
569 | |
---|
570 | // Retrieve the first intensity point in vector |
---|
571 | // of (photon energy, intensity) pairs |
---|
572 | |
---|
573 | theFastLightVector->ResetIterator(); |
---|
574 | ++(*theFastLightVector); // advance to 1st entry |
---|
575 | |
---|
576 | G4double currentIN = theFastLightVector-> |
---|
577 | GetProperty(); |
---|
578 | |
---|
579 | if (currentIN >= 0.0) { |
---|
580 | |
---|
581 | // Create first (photon energy, Scintillation |
---|
582 | // Integral pair |
---|
583 | |
---|
584 | G4double currentPM = theFastLightVector-> |
---|
585 | GetPhotonEnergy(); |
---|
586 | |
---|
587 | G4double currentCII = 0.0; |
---|
588 | |
---|
589 | aPhysicsOrderedFreeVector-> |
---|
590 | InsertValues(currentPM , currentCII); |
---|
591 | |
---|
592 | // Set previous values to current ones prior to loop |
---|
593 | |
---|
594 | G4double prevPM = currentPM; |
---|
595 | G4double prevCII = currentCII; |
---|
596 | G4double prevIN = currentIN; |
---|
597 | |
---|
598 | // loop over all (photon energy, intensity) |
---|
599 | // pairs stored for this material |
---|
600 | |
---|
601 | while(++(*theFastLightVector)) |
---|
602 | { |
---|
603 | currentPM = theFastLightVector-> |
---|
604 | GetPhotonEnergy(); |
---|
605 | |
---|
606 | currentIN = theFastLightVector-> |
---|
607 | GetProperty(); |
---|
608 | |
---|
609 | currentCII = 0.5 * (prevIN + currentIN); |
---|
610 | |
---|
611 | currentCII = prevCII + |
---|
612 | (currentPM - prevPM) * currentCII; |
---|
613 | |
---|
614 | aPhysicsOrderedFreeVector-> |
---|
615 | InsertValues(currentPM, currentCII); |
---|
616 | |
---|
617 | prevPM = currentPM; |
---|
618 | prevCII = currentCII; |
---|
619 | prevIN = currentIN; |
---|
620 | } |
---|
621 | |
---|
622 | } |
---|
623 | } |
---|
624 | |
---|
625 | G4MaterialPropertyVector* theSlowLightVector = |
---|
626 | aMaterialPropertiesTable->GetProperty("SLOWCOMPONENT"); |
---|
627 | |
---|
628 | if (theSlowLightVector) { |
---|
629 | |
---|
630 | // Retrieve the first intensity point in vector |
---|
631 | // of (photon energy, intensity) pairs |
---|
632 | |
---|
633 | theSlowLightVector->ResetIterator(); |
---|
634 | ++(*theSlowLightVector); // advance to 1st entry |
---|
635 | |
---|
636 | G4double currentIN = theSlowLightVector-> |
---|
637 | GetProperty(); |
---|
638 | |
---|
639 | if (currentIN >= 0.0) { |
---|
640 | |
---|
641 | // Create first (photon energy, Scintillation |
---|
642 | // Integral pair |
---|
643 | |
---|
644 | G4double currentPM = theSlowLightVector-> |
---|
645 | GetPhotonEnergy(); |
---|
646 | |
---|
647 | G4double currentCII = 0.0; |
---|
648 | |
---|
649 | bPhysicsOrderedFreeVector-> |
---|
650 | InsertValues(currentPM , currentCII); |
---|
651 | |
---|
652 | // Set previous values to current ones prior to loop |
---|
653 | |
---|
654 | G4double prevPM = currentPM; |
---|
655 | G4double prevCII = currentCII; |
---|
656 | G4double prevIN = currentIN; |
---|
657 | |
---|
658 | // loop over all (photon energy, intensity) |
---|
659 | // pairs stored for this material |
---|
660 | |
---|
661 | while(++(*theSlowLightVector)) |
---|
662 | { |
---|
663 | currentPM = theSlowLightVector-> |
---|
664 | GetPhotonEnergy(); |
---|
665 | |
---|
666 | currentIN=theSlowLightVector-> |
---|
667 | GetProperty(); |
---|
668 | |
---|
669 | currentCII = 0.5 * (prevIN + currentIN); |
---|
670 | |
---|
671 | currentCII = prevCII + |
---|
672 | (currentPM - prevPM) * currentCII; |
---|
673 | |
---|
674 | bPhysicsOrderedFreeVector-> |
---|
675 | InsertValues(currentPM, currentCII); |
---|
676 | |
---|
677 | prevPM = currentPM; |
---|
678 | prevCII = currentCII; |
---|
679 | prevIN = currentIN; |
---|
680 | } |
---|
681 | |
---|
682 | } |
---|
683 | } |
---|
684 | } |
---|
685 | |
---|
686 | // The scintillation integral(s) for a given material |
---|
687 | // will be inserted in the table(s) according to the |
---|
688 | // position of the material in the material table. |
---|
689 | |
---|
690 | theFastIntegralTable->insertAt(i,aPhysicsOrderedFreeVector); |
---|
691 | theSlowIntegralTable->insertAt(i,bPhysicsOrderedFreeVector); |
---|
692 | |
---|
693 | } |
---|
694 | } |
---|
695 | |
---|
696 | // Called by the user to set the scintillation yield as a function |
---|
697 | // of energy deposited by particle type |
---|
698 | |
---|
699 | void G4Scintillation::SetScintillationByParticleType(const G4bool scintType) |
---|
700 | { |
---|
701 | if (emSaturation) { |
---|
702 | G4Exception("G4Scintillation::SetScintillationByParticleType", "Redefinition", |
---|
703 | JustWarning, "Birks Saturation is replaced by ScintillationByParticleType!"); |
---|
704 | RemoveSaturation(); |
---|
705 | } |
---|
706 | scintillationByParticleType = scintType; |
---|
707 | } |
---|
708 | |
---|
709 | // GetMeanFreePath |
---|
710 | // --------------- |
---|
711 | // |
---|
712 | |
---|
713 | G4double G4Scintillation::GetMeanFreePath(const G4Track&, |
---|
714 | G4double , |
---|
715 | G4ForceCondition* condition) |
---|
716 | { |
---|
717 | *condition = StronglyForced; |
---|
718 | |
---|
719 | return DBL_MAX; |
---|
720 | |
---|
721 | } |
---|
722 | |
---|
723 | // GetMeanLifeTime |
---|
724 | // --------------- |
---|
725 | // |
---|
726 | |
---|
727 | G4double G4Scintillation::GetMeanLifeTime(const G4Track&, |
---|
728 | G4ForceCondition* condition) |
---|
729 | { |
---|
730 | *condition = Forced; |
---|
731 | |
---|
732 | return DBL_MAX; |
---|
733 | |
---|
734 | } |
---|
735 | |
---|
736 | G4double G4Scintillation::sample_time(G4double tau1, G4double tau2) |
---|
737 | { |
---|
738 | // tau1: rise time and tau2: decay time |
---|
739 | |
---|
740 | while(1) { |
---|
741 | // two random numbers |
---|
742 | G4double ran1 = G4UniformRand(); |
---|
743 | G4double ran2 = G4UniformRand(); |
---|
744 | // |
---|
745 | // exponential distribution as envelope function: very efficient |
---|
746 | // |
---|
747 | G4double d = (tau1+tau2)/tau2; |
---|
748 | // make sure the envelope function is |
---|
749 | // always larger than the bi-exponential |
---|
750 | G4double t = -1.0*tau2*std::log(1-ran1); |
---|
751 | G4double g = d*single_exp(t,tau2); |
---|
752 | if (ran2 <= bi_exp(t,tau1,tau2)/g) return t; |
---|
753 | } |
---|
754 | return -1.0; |
---|
755 | } |
---|