B3b/src/PrimaryGeneratorAction.cc

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0027 /// \file B3/B3b/src/PrimaryGeneratorAction.cc
0028 /// \brief Implementation of the B3::PrimaryGeneratorAction class
0029
0030 #include "PrimaryGeneratorAction.hh"
0031
0032 #include "G4ChargedGeantino.hh"
0033 #include "G4IonTable.hh"
0034 #include "G4ParticleGun.hh"
0035 #include "G4ParticleTable.hh"
0036 #include "G4SystemOfUnits.hh"
0037 #include "Randomize.hh"
0038
0039 namespace B3
0040 {
0041
0042 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0043
0044 PrimaryGeneratorAction::PrimaryGeneratorAction()
0045 {
0046   G4int n_particle = 1;
0047   fParticleGun = new G4ParticleGun(n_particle);
0048
0049   // default particle kinematic
0050
0051   G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
0052   G4ParticleDefinition* particle = particleTable->FindParticle("chargedgeantino");
0053   fParticleGun->SetParticleDefinition(particle);
0054   fParticleGun->SetParticlePosition(G4ThreeVector(0., 0., 0.));
0055   fParticleGun->SetParticleEnergy(1 * eV);
0056   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(1., 0., 0.));
0057 }
0058
0059 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0060
0061 PrimaryGeneratorAction::~PrimaryGeneratorAction()
0062 {
0063   delete fParticleGun;
0064 }
0065
0066 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0067
0068 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* event)
0069 {
0070   G4ParticleDefinition* particle = fParticleGun->GetParticleDefinition();
0071   if (particle == G4ChargedGeantino::ChargedGeantino()) {
0072     // fluorine
0073     G4int Z = 9, A = 18;
0074     G4double ionCharge = 0. * eplus;
0075     G4double excitEnergy = 0. * keV;
0076
0077     G4ParticleDefinition* ion = G4IonTable::GetIonTable()->GetIon(Z, A, excitEnergy);
0078     fParticleGun->SetParticleDefinition(ion);
0079     fParticleGun->SetParticleCharge(ionCharge);
0080   }
0081
0082   // randomized position
0083   //
0084   /// G4double x0  = 0*cm, y0  = 0*cm, z0  = 0*cm;
0085   /// G4double dx0 = 0*cm, dy0 = 0*cm, dz0 = 0*cm;
0086   G4double x0 = 4 * cm, y0 = 4 * cm, z0 = 4 * cm;
0087   G4double dx0 = 1 * cm, dy0 = 1 * cm, dz0 = 1 * cm;
0088   x0 += dx0 * (G4UniformRand() - 0.5);
0089   y0 += dy0 * (G4UniformRand() - 0.5);
0090   z0 += dz0 * (G4UniformRand() - 0.5);
0091   fParticleGun->SetParticlePosition(G4ThreeVector(x0, y0, z0));
0092
0093   // create vertex
0094   //
0095   fParticleGun->GeneratePrimaryVertex(event);
0096 }
0097
0098 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0099
0100 }  // namespace B3