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24 | // ******************************************************************** |
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25 | // |
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26 | // Rich advanced example for Geant4 |
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27 | // PadHpdPhotoElectricEffect.cc for Rich of LHCb |
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28 | // History: |
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29 | // Created: Sajan Easo (Sajan.Easo@cern.ch) |
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30 | // Revision: Patricia Mendez (Patricia.Mendez@cern.ch) |
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31 | ///////////////////////////////////////////////////////////////////////////// |
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32 | #include "globals.hh" |
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33 | #include <cmath> |
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34 | |
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35 | #include "PadHpdPhotoElectricEffect.hh" |
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36 | #include "RichTbGeometryParameters.hh" |
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37 | #include "G4TransportationManager.hh" |
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38 | #include "G4TouchableHandle.hh" |
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39 | #include "G4GeometryTolerance.hh" |
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40 | #include "Randomize.hh" |
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41 | #include "RichTbAnalysisManager.hh" |
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42 | #include "RichTbRunConfig.hh" |
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43 | #include "RichTbMaterialParameters.hh" |
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44 | |
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45 | #include "RichTbAnalysisManager.hh" |
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46 | |
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47 | PadHpdPhotoElectricEffect::PadHpdPhotoElectricEffect(const G4String& processName , |
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48 | RichTbRunConfig* RConfig) |
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49 | :G4VDiscreteProcess(processName), |
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50 | DemagnificationFactor(std::vector<G4double>(NumHpdTot)), |
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51 | DemagnificationQuadFactor(std::vector<G4double>(NumHpdTot)), |
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52 | HpdQE(NumHpdTot, std::vector<G4double>( NumQEbins)), |
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53 | HpdWabin(NumHpdTot, std::vector<G4double>( NumQEbins)) |
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54 | { |
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55 | rConfig=RConfig; |
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56 | PrePhotoElectricVolName="PadHpdWindowQuartz"; |
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57 | PostPhotoElectricVolName="BiAlkaliPhCathode"; |
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58 | HpdPhElectronKE=(RConfig-> getHpdPhElectronEnergy())*keV; |
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59 | PhCathodeToSilDetDist= HpdPhotoCathodeSiZdist; |
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60 | PSFsigma=PadHpdPSFsigma; |
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61 | |
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62 | for(G4int ihpdq=0; ihpdq<NumHpdTot; ihpdq++ ) { |
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63 | |
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64 | if( HpdDemagLinearTerm[ihpdq] != 0.0 ) { |
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65 | DemagnificationFactor[ihpdq]=1.0 / HpdDemagLinearTerm[ihpdq]; |
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66 | }else { DemagnificationFactor[ihpdq] =1.0 / 2.3;} |
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67 | |
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68 | if( HpdDemagQuadraticTerm[ihpdq] != 0.0 ) { |
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69 | |
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70 | DemagnificationQuadFactor[ihpdq]=1.0 / HpdDemagQuadraticTerm[ihpdq]; |
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71 | |
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72 | }else{DemagnificationQuadFactor[ihpdq]=0.0*(1.0/(1.0*mm)); } |
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73 | |
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74 | |
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75 | // Now to apply the error on the HPD demag factor. SE 28-4-02 |
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76 | // for now a flat error is applied. the uniform number from -1.0 to |
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77 | // 1.0 is obtained and then multiplied with the factor. |
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78 | |
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79 | G4double DemagError= (HpdDemagErrorPercent/100.0)*(2.0*G4UniformRand()-1.0) ; |
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80 | |
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81 | DemagnificationFactor[ihpdq] = DemagnificationFactor[ihpdq]*(1.0+DemagError); |
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82 | |
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83 | |
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84 | std::vector<G4double>qeCurHpd = InitializeHpdQE(ihpdq); |
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85 | std::vector<G4double>waCurHpd = InitializeHpdWaveL(ihpdq); |
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86 | if(qeCurHpd.size() != waCurHpd.size() ) { |
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87 | G4cout<<"Wrong size for Hpd QE "<<ihpdq<<" "<<qeCurHpd.size() |
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88 | <<" "<< waCurHpd.size()<<G4endl; |
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89 | } |
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90 | for(size_t iqbin=0; iqbin < qeCurHpd.size(); iqbin++){ |
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91 | HpdQE[ihpdq][iqbin]=qeCurHpd[iqbin]/100; |
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92 | HpdWabin[ihpdq][iqbin]=waCurHpd[iqbin]; |
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93 | } |
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94 | } |
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95 | G4cout<<GetProcessName() <<" is created "<<G4endl; |
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96 | |
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97 | |
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98 | } |
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99 | PadHpdPhotoElectricEffect::~PadHpdPhotoElectricEffect() {; } |
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100 | |
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101 | G4bool PadHpdPhotoElectricEffect::IsApplicable(const G4ParticleDefinition& |
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102 | aParticleType) |
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103 | { |
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104 | return ( &aParticleType == G4OpticalPhoton::OpticalPhoton() ); |
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105 | } |
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106 | |
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107 | G4double PadHpdPhotoElectricEffect::GetMeanFreePath(const G4Track& , |
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108 | G4double , |
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109 | G4ForceCondition* condition) |
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110 | { |
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111 | *condition = Forced; |
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112 | |
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113 | return DBL_MAX; |
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114 | } |
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115 | |
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116 | G4VParticleChange* PadHpdPhotoElectricEffect::PostStepDoIt(const G4Track& aTrack, |
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117 | const G4Step& aStep) |
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118 | { |
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119 | |
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120 | aParticleChange.Initialize(aTrack); |
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121 | |
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122 | G4StepPoint* pPreStepPoint = aStep.GetPreStepPoint(); |
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123 | G4StepPoint* pPostStepPoint = aStep.GetPostStepPoint(); |
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124 | |
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125 | |
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126 | |
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127 | if (pPostStepPoint->GetStepStatus() != fGeomBoundary){ |
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128 | |
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129 | return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
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130 | |
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131 | } |
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132 | |
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133 | |
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134 | G4String PrePhName = pPreStepPoint -> GetPhysicalVolume() -> |
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135 | GetLogicalVolume() -> GetMaterial()->GetName(); |
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136 | G4String PostPhName= pPostStepPoint -> GetPhysicalVolume() -> |
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137 | GetLogicalVolume() -> GetMaterial() ->GetName(); |
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138 | |
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139 | |
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140 | if(( PrePhName == PrePhotoElectricVolName && |
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141 | PostPhName == PostPhotoElectricVolName) || |
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142 | ( PostPhName == PrePhotoElectricVolName && |
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143 | PrePhName == PostPhotoElectricVolName) ) { |
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144 | |
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145 | |
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146 | }else { |
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147 | |
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148 | return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
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149 | |
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150 | } |
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151 | |
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152 | G4double kCarTolerance = G4GeometryTolerance::GetInstance()->GetSurfaceTolerance(); |
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153 | if (aTrack.GetStepLength()<=kCarTolerance/2){ |
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154 | return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
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155 | } |
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156 | |
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157 | const G4DynamicParticle* aDynamicPhoton = aTrack.GetDynamicParticle(); |
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158 | G4double PhotonEnergy = aDynamicPhoton->GetKineticEnergy(); |
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159 | |
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160 | if(PhotonEnergy <= 0.0 ) { |
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161 | |
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162 | return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
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163 | } |
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164 | |
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165 | |
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166 | //Now use the QE for the current HPD to determine if a |
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167 | // photoelectron should be produced or not. |
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168 | |
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169 | G4int currentHpdNumber= pPreStepPoint->GetTouchableHandle() |
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170 | -> GetReplicaNumber(1); |
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171 | if(currentHpdNumber >= NumHpdTot ){ |
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172 | |
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173 | return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
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174 | |
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175 | } |
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176 | |
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177 | G4double PhotWLength=PhotMomWaveConv/(PhotonEnergy/eV); |
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178 | |
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179 | G4double PhCathodeQE = getHpdQEff(currentHpdNumber, PhotWLength); |
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180 | G4double randomnum = G4UniformRand(); |
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181 | |
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182 | |
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183 | //the following three lines are copied from few lines later just |
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184 | // for histogramming convenience. |
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185 | G4ThreeVector GlobalElectronOrigin= pPostStepPoint->GetPosition(); |
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186 | |
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187 | G4Navigator* theNavigator = |
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188 | G4TransportationManager::GetTransportationManager()-> |
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189 | GetNavigatorForTracking(); |
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190 | G4ThreeVector LocalElectronOrigin = theNavigator-> |
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191 | GetGlobalToLocalTransform(). |
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192 | TransformPoint(GlobalElectronOrigin); |
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193 | |
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194 | |
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195 | |
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196 | // For the histogram of the radius of the cherenkov circle. |
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197 | // This assumes that the beam is along 001 axis in the global |
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198 | // coord system. |
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199 | G4double GLx=GlobalElectronOrigin.x(); |
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200 | G4double GLy=GlobalElectronOrigin.y(); |
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201 | // G4double PhotCkvRad = std::pow((std::pow(GLx,2)+std::pow(GLy,2)),0.5); |
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202 | G4double PhotCkvPhi = std::atan2(GLy,GLx)*180.0/pi; |
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203 | |
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204 | if( PhotCkvPhi < - 180.0 )PhotCkvPhi+= 360.0; |
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205 | |
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206 | if(randomnum < PhCathodeQE ) { |
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207 | |
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208 | |
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209 | G4double CurDemagFactor=DemagnificationFactor[currentHpdNumber]; |
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210 | G4double CurDemagQuadFactor=DemagnificationQuadFactor[currentHpdNumber]; |
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211 | |
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212 | // now get the Point Spread function. |
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213 | |
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214 | G4double PsfRandomAzimuth = twopi*G4UniformRand(); |
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215 | G4double PsfRandomRad= G4RandGauss::shoot(0.0,PSFsigma); |
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216 | G4double PsfX= PsfRandomRad*std::cos( PsfRandomAzimuth); |
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217 | G4double PsfY= PsfRandomRad*std::sin( PsfRandomAzimuth); |
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218 | |
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219 | |
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220 | G4ThreeVector LocalElectronDirection( |
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221 | (CurDemagFactor+CurDemagQuadFactor*LocalElectronOrigin.x()-1.0)*LocalElectronOrigin.x()+PsfX, |
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222 | (CurDemagFactor+CurDemagQuadFactor*LocalElectronOrigin.y()-1.0)*LocalElectronOrigin.y()+PsfY, |
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223 | -(PhCathodeToSilDetDist- |
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224 | (HpdPhCathodeRInner-LocalElectronOrigin.z()))); |
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225 | //normalize this vector and then transform back to global coord system. |
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226 | LocalElectronDirection = LocalElectronDirection.unit(); |
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227 | |
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228 | const G4ThreeVector GlobalElectronDirection = theNavigator-> |
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229 | GetLocalToGlobalTransform(). |
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230 | TransformAxis(LocalElectronDirection); |
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231 | |
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232 | G4double ElecKineEnergy=getHpdPhElectronKE(); |
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233 | |
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234 | //create the electron |
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235 | G4DynamicParticle* aElectron= new G4DynamicParticle (G4Electron::Electron(), |
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236 | GlobalElectronDirection, ElecKineEnergy) ; |
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237 | |
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238 | aParticleChange.SetNumberOfSecondaries(1) ; |
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239 | // aParticleChange.AddSecondary( aElectron ) ; |
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240 | aParticleChange.AddSecondary( aElectron,GlobalElectronOrigin,true ) ; |
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241 | |
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242 | |
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243 | // Kill the incident photon when it has converted to photoelectron. |
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244 | |
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245 | aParticleChange.ProposeLocalEnergyDeposit(PhotonEnergy); |
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246 | aParticleChange.ProposeEnergy(0.); |
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247 | aParticleChange.ProposeTrackStatus(fStopAndKill); |
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248 | } |
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249 | //photon is not killed if it is not converted to photoelectron |
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250 | //SE 26-09-01. |
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251 | return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep); |
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252 | |
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253 | } |
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254 | |
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255 | G4double PadHpdPhotoElectricEffect::getHpdQEff(G4int HpdNum, |
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256 | G4double PhotonWLength){ |
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257 | |
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258 | G4double hq1,hq2, wa1, wa2,aslope,aintc; |
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259 | G4double qeff=0.0; |
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260 | for (G4int ibinq=0 ; ibinq<NumQEbins-1 ; ibinq++ ){ |
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261 | wa1 = HpdWabin[HpdNum][ibinq]; |
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262 | wa2 = HpdWabin[HpdNum][ibinq+1]; |
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263 | if( PhotonWLength >= wa1 && PhotonWLength <= wa2 ) { |
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264 | hq1 = HpdQE[HpdNum][ibinq]; |
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265 | hq2 = HpdQE[HpdNum][ibinq+1]; |
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266 | aslope = (hq2-hq1)/(wa2-wa1); |
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267 | aintc = hq1 - (aslope * wa1 ); |
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268 | qeff= aintc + aslope * PhotonWLength ; |
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269 | return qeff; |
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270 | } |
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271 | |
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272 | } |
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273 | return qeff; |
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274 | } |
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275 | |
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276 | |
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277 | |
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278 | |
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