field05/src/F05PrimaryGeneratorAction.cc

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0025 //
0026 /// \file F05PrimaryGeneratorAction.cc
0027 /// \brief Implementation of the F05PrimaryGeneratorAction class
0028
0029 #include "F05PrimaryGeneratorAction.hh"
0030
0031 #include "F05DetectorConstruction.hh"
0032
0033 #include "G4Event.hh"
0034 #include "G4ParticleDefinition.hh"
0035 #include "G4ParticleGun.hh"
0036 #include "G4ParticleTable.hh"
0037 #include "G4SystemOfUnits.hh"
0038 #include "Randomize.hh"
0039
0040 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0041
0042 F05PrimaryGeneratorAction::F05PrimaryGeneratorAction()
0043 {
0044   G4int n_particle = 1;
0045   fParticleGun = new G4ParticleGun(n_particle);
0046
0047   G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
0048   G4ParticleDefinition* particle = particleTable->FindParticle("mu+");
0049
0050   fParticleGun->SetParticleDefinition(particle);
0051 }
0052
0053 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0054
0055 F05PrimaryGeneratorAction::~F05PrimaryGeneratorAction()
0056 {
0057   delete fParticleGun;
0058 }
0059
0060 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0061
0062 void F05PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0063 {
0064   // this function is called at the begining of event
0065   //
0066
0067   G4double Pmu = 517.6 * MeV;
0068   G4double mu_mass = 105.658 * MeV;
0069   G4double Emu = std::sqrt(Pmu * Pmu + mu_mass * mu_mass);
0070   G4double Kmu = Emu - mu_mass;
0071
0072   G4double x0 = -6.99 * m;
0073   G4double y0 = 0.00 * m;
0074   G4double z0 = 0.00 * m;
0075
0076   fParticleGun->SetParticleEnergy(Kmu);
0077   fParticleGun->SetParticlePosition(G4ThreeVector(x0, y0, z0));
0078   fParticleGun->SetParticlePolarization(G4ThreeVector(0., 1., 0.));
0079   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0., 1., 0.));
0080
0081   fParticleGun->GeneratePrimaryVertex(anEvent);
0082 }
0083
0084 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......