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2 | // ******************************************************************** |
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24 | // ******************************************************************** |
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25 | // |
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26 | // |
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27 | // $Id: ExN05EMShowerModel.cc,v 1.15 2006/11/14 09:21:44 gcosmo Exp $ |
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28 | // GEANT4 tag $Name: $ |
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29 | // |
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30 | #include "ExN05EMShowerModel.hh" |
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31 | #include "ExN05EnergySpot.hh" |
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32 | |
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33 | #include "Randomize.hh" |
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34 | |
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35 | #include "G4Electron.hh" |
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36 | #include "G4Positron.hh" |
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37 | #include "G4Gamma.hh" |
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38 | #include "G4TransportationManager.hh" |
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39 | #include "G4VSensitiveDetector.hh" |
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40 | #include "G4TouchableHandle.hh" |
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41 | |
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42 | ExN05EMShowerModel::ExN05EMShowerModel(G4String modelName, G4Region* envelope) |
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43 | : G4VFastSimulationModel(modelName, envelope) |
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44 | { |
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45 | fFakeStep = new G4Step(); |
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46 | fFakePreStepPoint = fFakeStep->GetPreStepPoint(); |
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47 | fFakePostStepPoint = fFakeStep->GetPostStepPoint(); |
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48 | fTouchableHandle = new G4TouchableHistory(); |
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49 | fpNavigator = new G4Navigator(); |
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50 | fNaviSetup = false; |
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51 | } |
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52 | |
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53 | ExN05EMShowerModel::ExN05EMShowerModel(G4String modelName) |
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54 | : G4VFastSimulationModel(modelName) |
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55 | { |
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56 | fFakeStep = new G4Step(); |
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57 | fFakePreStepPoint = fFakeStep->GetPreStepPoint(); |
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58 | fFakePostStepPoint = fFakeStep->GetPostStepPoint(); |
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59 | fTouchableHandle = new G4TouchableHistory(); |
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60 | fpNavigator = new G4Navigator(); |
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61 | fNaviSetup = false; |
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62 | } |
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63 | |
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64 | ExN05EMShowerModel::~ExN05EMShowerModel() |
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65 | { |
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66 | delete fFakeStep; |
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67 | delete fpNavigator; |
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68 | } |
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69 | |
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70 | G4bool ExN05EMShowerModel::IsApplicable(const G4ParticleDefinition& particleType) |
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71 | { |
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72 | return |
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73 | &particleType == G4Electron::ElectronDefinition() || |
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74 | &particleType == G4Positron::PositronDefinition() || |
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75 | &particleType == G4Gamma::GammaDefinition(); |
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76 | } |
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77 | |
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78 | G4bool ExN05EMShowerModel::ModelTrigger(const G4FastTrack& fastTrack) |
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79 | { |
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80 | // Applies the parameterisation above 100 MeV: |
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81 | return fastTrack.GetPrimaryTrack()->GetKineticEnergy() > 100*MeV; |
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82 | } |
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83 | |
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84 | void ExN05EMShowerModel::DoIt(const G4FastTrack& fastTrack, |
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85 | G4FastStep& fastStep) |
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86 | { |
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87 | // Kill the parameterised particle: |
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88 | fastStep.KillPrimaryTrack(); |
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89 | fastStep.ProposePrimaryTrackPathLength(0.0); |
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90 | fastStep.ProposeTotalEnergyDeposited(fastTrack.GetPrimaryTrack()->GetKineticEnergy()); |
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91 | |
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92 | // split into "energy spots" energy according to the shower shape: |
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93 | Explode(fastTrack); |
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94 | |
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95 | // and put those energy spots into the crystals: |
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96 | BuildDetectorResponse(); |
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97 | |
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98 | } |
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99 | |
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100 | void ExN05EMShowerModel::Explode(const G4FastTrack& fastTrack) |
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101 | { |
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102 | //----------------------------------------------------- |
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103 | // |
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104 | //----------------------------------------------------- |
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105 | |
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106 | // Reduced quantities: |
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107 | // -- critical energy in CsI: |
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108 | G4double Ec = 800*MeV/(54. + 1.2); // 54 = mean Z of CsI |
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109 | G4double Energy = fastTrack.GetPrimaryTrack()->GetKineticEnergy(); |
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110 | G4double y = Energy/Ec; |
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111 | |
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112 | // compute value of parameter "a" of longitudinal profile, b assumed = 0.5 |
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113 | G4double a, tmax, b(0.5), C; |
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114 | if (fastTrack.GetPrimaryTrack()->GetDefinition() == G4Gamma::GammaDefinition()) C = 0.5; |
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115 | else C = -0.5; |
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116 | tmax = 1.0 * (std::log(y) + C); |
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117 | a = 1.0 + b*tmax; |
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118 | |
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119 | // t : reduced quantity = z/X0: |
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120 | G4double t, bt; |
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121 | G4Material* CsI = G4Material::GetMaterial("CsI"); |
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122 | G4double X0 = CsI->GetRadlen(); |
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123 | // Moliere radius: |
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124 | G4double Es = 21*MeV; |
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125 | G4double Rm = X0*Es/Ec; |
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126 | |
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127 | // axis of the shower, in global reference frame: |
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128 | G4ThreeVector xShower, yShower, zShower; |
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129 | zShower = fastTrack.GetPrimaryTrack()->GetMomentumDirection(); |
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130 | xShower = zShower.orthogonal(); |
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131 | yShower = zShower.cross(xShower); |
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132 | // starting point of the shower: |
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133 | G4ThreeVector sShower = fastTrack.GetPrimaryTrack()->GetPosition(); |
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134 | |
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135 | // We shoot 100 spots of energy: |
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136 | G4int nSpots = 100; |
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137 | G4double deposit = Energy/double(nSpots); |
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138 | ExN05EnergySpot eSpot; |
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139 | eSpot.SetEnergy(deposit); |
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140 | G4ThreeVector ePoint; |
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141 | G4double z, r, phi; |
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142 | |
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143 | feSpotList.clear(); |
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144 | for (int i = 0; i < nSpots; i++) |
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145 | { |
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146 | // Longitudinal profile: |
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147 | // -- shoot z according to Gamma distribution: |
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148 | bt = CLHEP::RandGamma::shoot(a,1.0); |
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149 | t = bt/b; |
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150 | z = t*X0; |
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151 | |
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152 | // transverse profile: |
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153 | // we set 90% of energy in one Rm, |
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154 | // the rest between 1 and 3.5 Rm: |
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155 | G4double xr = G4UniformRand(); |
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156 | if (xr < 0.9) r = xr/0.9*Rm; |
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157 | else r = ((xr - 0.9)/0.1*2.5 + 1.0)*Rm; |
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158 | phi = G4UniformRand()*twopi; |
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159 | |
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160 | // build the position: |
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161 | ePoint = sShower + |
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162 | z*zShower + |
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163 | r*std::cos(phi)*xShower + r*std::sin(phi)*yShower; |
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164 | |
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165 | // and the energy spot: |
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166 | eSpot.SetPosition(ePoint); |
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167 | |
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168 | // Records the eSpot: |
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169 | feSpotList.push_back(eSpot); |
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170 | } |
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171 | } |
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172 | |
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173 | |
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174 | void ExN05EMShowerModel::BuildDetectorResponse() |
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175 | { |
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176 | // Does the assignation of the energy spots to the sensitive volumes: |
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177 | for (size_t i = 0; i < feSpotList.size(); i++) |
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178 | { |
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179 | // Draw the energy spot: |
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180 | feSpotList[i].Draw(); |
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181 | // feSpotList[i].Print(); |
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182 | |
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183 | // "converts" the energy spot into the fake |
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184 | // G4Step to pass to sensitive detector: |
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185 | AssignSpotAndCallHit(feSpotList[i]); |
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186 | } |
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187 | } |
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188 | |
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189 | |
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190 | void ExN05EMShowerModel::AssignSpotAndCallHit(const ExN05EnergySpot &eSpot) |
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191 | { |
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192 | // |
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193 | // "converts" the energy spot into the fake |
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194 | // G4Step to pass to sensitive detector: |
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195 | // |
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196 | FillFakeStep(eSpot); |
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197 | |
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198 | // |
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199 | // call sensitive part: taken/adapted from the stepping: |
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200 | // Send G4Step information to Hit/Dig if the volume is sensitive |
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201 | // |
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202 | G4VPhysicalVolume* pCurrentVolume = |
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203 | fFakeStep->GetPreStepPoint()->GetPhysicalVolume(); |
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204 | G4VSensitiveDetector* pSensitive; |
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205 | |
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206 | if( pCurrentVolume != 0 ) |
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207 | { |
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208 | pSensitive = pCurrentVolume->GetLogicalVolume()-> |
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209 | GetSensitiveDetector(); |
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210 | if( pSensitive != 0 ) |
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211 | { |
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212 | pSensitive->Hit(fFakeStep); |
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213 | } |
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214 | } |
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215 | } |
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216 | |
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217 | |
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218 | void ExN05EMShowerModel::FillFakeStep(const ExN05EnergySpot &eSpot) |
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219 | { |
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220 | //----------------------------------------------------------- |
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221 | // find in which volume the spot is. |
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222 | //----------------------------------------------------------- |
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223 | if (!fNaviSetup) |
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224 | { |
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225 | fpNavigator-> |
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226 | SetWorldVolume(G4TransportationManager::GetTransportationManager()-> |
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227 | GetNavigatorForTracking()->GetWorldVolume()); |
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228 | fpNavigator-> |
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229 | LocateGlobalPointAndUpdateTouchableHandle(eSpot.GetPosition(), |
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230 | G4ThreeVector(0.,0.,0.), |
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231 | fTouchableHandle, |
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232 | false); |
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233 | fNaviSetup = true; |
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234 | } |
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235 | else |
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236 | { |
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237 | fpNavigator-> |
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238 | LocateGlobalPointAndUpdateTouchableHandle(eSpot.GetPosition(), |
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239 | G4ThreeVector(0.,0.,0.), |
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240 | fTouchableHandle); |
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241 | } |
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242 | //-------------------------------------- |
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243 | // Fills attribute of the G4Step needed |
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244 | // by our sensitive detector: |
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245 | //------------------------------------- |
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246 | // set touchable volume at PreStepPoint: |
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247 | fFakePreStepPoint->SetTouchableHandle(fTouchableHandle); |
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248 | // set total energy deposit: |
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249 | fFakeStep->SetTotalEnergyDeposit(eSpot.GetEnergy()); |
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250 | } |
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