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Geant4/examples/extended/medical/fanoCavity2/src/PrimaryGeneratorAction.cc

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 25 //
 26 /// \file medical/fanoCavity2/src/PrimaryGeneratorAction.cc
 27 /// \brief Implementation of the PrimaryGeneratorAction class
 28 //
 29 //
 30 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 31 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 32 
 33 #include "PrimaryGeneratorAction.hh"
 34 
 35 #include "DetectorConstruction.hh"
 36 #include "HistoManager.hh"
 37 
 38 #include "G4Event.hh"
 39 #include "G4ParticleDefinition.hh"
 40 #include "G4ParticleGun.hh"
 41 #include "G4ParticleTable.hh"
 42 #include "G4SystemOfUnits.hh"
 43 #include "Randomize.hh"
 44 
 45 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 46 
 47 PrimaryGeneratorAction::PrimaryGeneratorAction(DetectorConstruction* det)
 48   : fParticleGun(0), fDetector(det)
 49 {
 50   fParticleGun = new G4ParticleGun(1);
 51   G4ParticleDefinition* particle = G4ParticleTable::GetParticleTable()->FindParticle("e-");
 52   fParticleGun->SetParticleDefinition(particle);
 53   fParticleGun->SetParticleEnergy(1 * MeV);
 54   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0., 0., 1.));
 55 }
 56 
 57 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 58 
 59 PrimaryGeneratorAction::~PrimaryGeneratorAction()
 60 {
 61   delete fParticleGun;
 62 }
 63 
 64 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 65 
 66 void PrimaryGeneratorAction::RunInitialisation(G4double effWall, G4double massR)
 67 {
 68   // this function is called at beginning of run
 69 
 70   fCavityThickness = fDetector->GetCavityThickness();
 71   fEffWallThick = effWall;
 72   fMassWallRatio = massR;
 73 
 74   fNwall = fNcavity = 0;
 75 }
 76 
 77 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 78 
 79 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
 80 {
 81   // this function is called at the begining of event
 82   //
 83   G4double Zvertex;
 84   if (G4UniformRand() < fMassWallRatio) {
 85     Zvertex = 0.5 * fCavityThickness + G4UniformRand() * fEffWallThick;
 86     if (G4UniformRand() < 0.5) Zvertex = -Zvertex;
 87     fNwall++;
 88   }
 89   else {
 90     Zvertex = (G4UniformRand() - 0.5) * fCavityThickness;
 91     fNcavity++;
 92   }
 93 
 94   fParticleGun->SetParticlePosition(G4ThreeVector(0., 0., Zvertex));
 95   fParticleGun->GeneratePrimaryVertex(anEvent);
 96 
 97   // histograms
 98   //
 99   G4AnalysisManager* analysisManager = G4AnalysisManager::Instance();
100   analysisManager->FillH1(1, Zvertex);
101   analysisManager->FillH1(2, fParticleGun->GetParticleEnergy());
102 }
103 
104 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
105