[816] | 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: G4ParticleGun.cc,v 1.14 2007/11/07 17:13:19 asaim Exp $ |
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[964] | 28 | // GEANT4 tag $Name: geant4-09-02-ref-02 $ |
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[816] | 29 | // |
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| 30 | |
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| 31 | // G4ParticleGun |
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| 32 | #include "G4ParticleGun.hh" |
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| 33 | #include "G4PrimaryParticle.hh" |
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| 34 | #include "G4ParticleGunMessenger.hh" |
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| 35 | #include "G4Event.hh" |
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| 36 | #include "G4ios.hh" |
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| 37 | |
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| 38 | G4ParticleGun::G4ParticleGun() |
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| 39 | { |
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| 40 | SetInitialValues(); |
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| 41 | } |
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| 42 | |
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| 43 | G4ParticleGun::G4ParticleGun(G4int numberofparticles) |
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| 44 | { |
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| 45 | SetInitialValues(); |
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| 46 | NumberOfParticlesToBeGenerated = numberofparticles; |
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| 47 | } |
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| 48 | |
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| 49 | G4ParticleGun::G4ParticleGun |
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| 50 | (G4ParticleDefinition * particleDef, G4int numberofparticles) |
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| 51 | { |
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| 52 | SetInitialValues(); |
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| 53 | NumberOfParticlesToBeGenerated = numberofparticles; |
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| 54 | SetParticleDefinition( particleDef ); |
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| 55 | } |
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| 56 | |
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| 57 | void G4ParticleGun::SetInitialValues() |
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| 58 | { |
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| 59 | NumberOfParticlesToBeGenerated = 1; |
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| 60 | particle_definition = 0; |
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| 61 | G4ThreeVector zero; |
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| 62 | particle_momentum_direction = (G4ParticleMomentum)zero; |
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| 63 | particle_energy = 0.0; |
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| 64 | particle_momentum = 0.0; |
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| 65 | particle_position = zero; |
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| 66 | particle_time = 0.0; |
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| 67 | particle_polarization = zero; |
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| 68 | particle_charge = 0.0; |
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| 69 | theMessenger = new G4ParticleGunMessenger(this); |
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| 70 | } |
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| 71 | |
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| 72 | G4ParticleGun::~G4ParticleGun() |
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| 73 | { |
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| 74 | delete theMessenger; |
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| 75 | } |
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| 76 | |
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| 77 | G4ParticleGun::G4ParticleGun(const G4ParticleGun& /*right*/) |
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| 78 | :G4VPrimaryGenerator() |
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| 79 | { G4Exception("G4ParticleGun : Copy constructor should not be used."); } |
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| 80 | |
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| 81 | const G4ParticleGun& G4ParticleGun::operator=(const G4ParticleGun& right) |
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| 82 | { G4Exception("G4ParticleGun : Equal operator should not be used."); return right; } |
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| 83 | |
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| 84 | G4int G4ParticleGun::operator==(const G4ParticleGun& /*right*/) const |
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| 85 | { G4Exception("G4ParticleGun : == operator should not be used."); return true; } |
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| 86 | |
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| 87 | G4int G4ParticleGun::operator!=(const G4ParticleGun& /*right*/) const |
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| 88 | { G4Exception("G4ParticleGun : == operator should not be used."); return false; } |
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| 89 | |
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| 90 | void G4ParticleGun::SetParticleDefinition |
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| 91 | (G4ParticleDefinition * aParticleDefinition) |
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| 92 | { |
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| 93 | if(!aParticleDefinition) |
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| 94 | { |
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| 95 | G4Exception("G4ParticleGun::SetParticleDefinition()","Event00003",FatalException, |
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| 96 | "Null pointer is given."); |
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| 97 | } |
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| 98 | if(aParticleDefinition->IsShortLived()) |
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| 99 | { |
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| 100 | if(!(aParticleDefinition->GetDecayTable())) |
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| 101 | { |
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| 102 | G4cerr << "G4ParticleGun does not support shooting a short-lived particle without a valid decay table." << G4endl; |
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| 103 | G4cerr << "G4ParticleGun::SetParticleDefinition for " |
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| 104 | << aParticleDefinition->GetParticleName() << " is ignored." << G4endl; |
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| 105 | return; |
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| 106 | } |
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| 107 | } |
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| 108 | particle_definition = aParticleDefinition; |
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| 109 | particle_charge = particle_definition->GetPDGCharge(); |
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| 110 | if(particle_momentum>0.0) |
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| 111 | { |
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| 112 | G4double mass = particle_definition->GetPDGMass(); |
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| 113 | particle_energy = |
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| 114 | std::sqrt(particle_momentum*particle_momentum+mass*mass)-mass; |
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| 115 | } |
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| 116 | } |
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| 117 | |
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| 118 | void G4ParticleGun::SetParticleEnergy(G4double aKineticEnergy) |
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| 119 | { |
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| 120 | particle_energy = aKineticEnergy; |
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| 121 | if(particle_momentum>0.0){ |
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| 122 | if(particle_definition){ |
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| 123 | G4cout << "G4ParticleGun::" << particle_definition->GetParticleName() |
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| 124 | << G4endl; |
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| 125 | }else{ |
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| 126 | G4cout << "G4ParticleGun::" << " " << G4endl; |
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| 127 | } |
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| 128 | G4cout << " was defined in terms of Momentum: " |
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| 129 | << particle_momentum/GeV << "GeV/c" << G4endl; |
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| 130 | G4cout << " is now defined in terms of KineticEnergy: " |
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| 131 | << particle_energy/GeV << "GeV" << G4endl; |
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| 132 | particle_momentum = 0.0; |
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| 133 | } |
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| 134 | } |
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| 135 | |
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| 136 | void G4ParticleGun::SetParticleMomentum(G4double aMomentum) |
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| 137 | { |
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| 138 | if(particle_energy>0.0){ |
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| 139 | if(particle_definition){ |
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| 140 | G4cout << "G4ParticleGun::" << particle_definition->GetParticleName() |
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| 141 | << G4endl; |
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| 142 | }else{ |
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| 143 | G4cout << "G4ParticleGun::" << " " << G4endl; |
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| 144 | } |
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| 145 | G4cout << " was defined in terms of KineticEnergy: " |
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| 146 | << particle_energy/GeV << "GeV" << G4endl; |
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| 147 | G4cout << " is now defined in terms Momentum: " |
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| 148 | << aMomentum/GeV << "GeV/c" << G4endl; |
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| 149 | } |
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| 150 | if(particle_definition==0) |
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| 151 | { |
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| 152 | G4cout <<"Particle Definition not defined yet for G4ParticleGun"<< G4endl; |
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| 153 | G4cout <<"Zero Mass is assumed"<<G4endl; |
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| 154 | particle_momentum = aMomentum; |
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| 155 | particle_energy = aMomentum; |
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| 156 | } |
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| 157 | else |
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| 158 | { |
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| 159 | G4double mass = particle_definition->GetPDGMass(); |
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| 160 | particle_momentum = aMomentum; |
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| 161 | particle_energy = |
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| 162 | std::sqrt(particle_momentum*particle_momentum+mass*mass)-mass; |
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| 163 | } |
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| 164 | } |
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| 165 | |
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| 166 | void G4ParticleGun::SetParticleMomentum(G4ParticleMomentum aMomentum) |
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| 167 | { |
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| 168 | if(particle_energy>0.0){ |
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| 169 | if(particle_definition){ |
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| 170 | G4cout << "G4ParticleGun::" << particle_definition->GetParticleName() |
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| 171 | << G4endl; |
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| 172 | }else{ |
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| 173 | G4cout << "G4ParticleGun::" << " " << G4endl; |
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| 174 | } |
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| 175 | G4cout << " was defined in terms of KineticEnergy: " |
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| 176 | << particle_energy/GeV << "GeV" << G4endl; |
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| 177 | G4cout << " is now defined in terms Momentum: " |
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| 178 | << aMomentum.mag()/GeV << "GeV/c" << G4endl; |
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| 179 | } |
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| 180 | if(particle_definition==0) |
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| 181 | { |
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| 182 | G4cout <<"Particle Definition not defined yet for G4ParticleGun"<< G4endl; |
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| 183 | G4cout <<"Zero Mass is assumed"<<G4endl; |
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| 184 | particle_momentum_direction = aMomentum.unit(); |
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| 185 | particle_momentum = aMomentum.mag(); |
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| 186 | particle_energy = aMomentum.mag(); |
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| 187 | } |
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| 188 | else |
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| 189 | { |
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| 190 | G4double mass = particle_definition->GetPDGMass(); |
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| 191 | particle_momentum = aMomentum.mag(); |
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| 192 | particle_momentum_direction = aMomentum.unit(); |
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| 193 | particle_energy = |
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| 194 | std::sqrt(particle_momentum*particle_momentum+mass*mass)-mass; |
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| 195 | } |
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| 196 | } |
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| 197 | |
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| 198 | void G4ParticleGun::GeneratePrimaryVertex(G4Event* evt) |
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| 199 | { |
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| 200 | if(particle_definition==0) return; |
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| 201 | |
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| 202 | // create a new vertex |
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| 203 | G4PrimaryVertex* vertex = |
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| 204 | new G4PrimaryVertex(particle_position,particle_time); |
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| 205 | |
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| 206 | // create new primaries and set them to the vertex |
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| 207 | G4double mass = particle_definition->GetPDGMass(); |
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| 208 | G4double energy = particle_energy + mass; |
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| 209 | G4double pmom = std::sqrt(energy*energy-mass*mass); |
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| 210 | G4double px = pmom*particle_momentum_direction.x(); |
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| 211 | G4double py = pmom*particle_momentum_direction.y(); |
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| 212 | G4double pz = pmom*particle_momentum_direction.z(); |
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| 213 | for( G4int i=0; i<NumberOfParticlesToBeGenerated; i++ ) |
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| 214 | { |
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| 215 | G4PrimaryParticle* particle = |
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| 216 | new G4PrimaryParticle(particle_definition,px,py,pz); |
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| 217 | particle->SetMass( mass ); |
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| 218 | particle->SetCharge( particle_charge ); |
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| 219 | particle->SetPolarization(particle_polarization.x(), |
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| 220 | particle_polarization.y(), |
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| 221 | particle_polarization.z()); |
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| 222 | vertex->SetPrimary( particle ); |
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| 223 | } |
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| 224 | |
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| 225 | evt->AddPrimaryVertex( vertex ); |
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| 226 | } |
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| 227 | |
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| 228 | |
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