field05/src/F05PrimaryGeneratorAction.cc

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0026 //
0027 /// \file field/field05/src/F05PrimaryGeneratorAction.cc
0028 /// \brief Implementation of the F05PrimaryGeneratorAction class
0029 //
0030
0031 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0032 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0033
0034 #include "F05PrimaryGeneratorAction.hh"
0035
0036 #include "F05DetectorConstruction.hh"
0037
0038 #include "G4Event.hh"
0039 #include "G4ParticleDefinition.hh"
0040 #include "G4ParticleGun.hh"
0041 #include "G4ParticleTable.hh"
0042 #include "G4SystemOfUnits.hh"
0043 #include "Randomize.hh"
0044
0045 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0046
0047 F05PrimaryGeneratorAction::F05PrimaryGeneratorAction()
0048 {
0049   G4int n_particle = 1;
0050   fParticleGun = new G4ParticleGun(n_particle);
0051
0052   G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
0053   G4ParticleDefinition* particle = particleTable->FindParticle("mu+");
0054
0055   fParticleGun->SetParticleDefinition(particle);
0056 }
0057
0058 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0059
0060 F05PrimaryGeneratorAction::~F05PrimaryGeneratorAction()
0061 {
0062   delete fParticleGun;
0063 }
0064
0065 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0066
0067 void F05PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0068 {
0069   // this function is called at the begining of event
0070   //
0071
0072   G4double Pmu = 517.6 * MeV;
0073   G4double mu_mass = 105.658 * MeV;
0074   G4double Emu = std::sqrt(Pmu * Pmu + mu_mass * mu_mass);
0075   G4double Kmu = Emu - mu_mass;
0076
0077   G4double x0 = -6.99 * m;
0078   G4double y0 = 0.00 * m;
0079   G4double z0 = 0.00 * m;
0080
0081   fParticleGun->SetParticleEnergy(Kmu);
0082   fParticleGun->SetParticlePosition(G4ThreeVector(x0, y0, z0));
0083   fParticleGun->SetParticlePolarization(G4ThreeVector(0., 1., 0.));
0084   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0., 1., 0.));
0085
0086   fParticleGun->GeneratePrimaryVertex(anEvent);
0087 }
0088
0089 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......