[807] | 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: 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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