B3b/src/PrimaryGeneratorAction.cc

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0025 //
0026 /// \file PrimaryGeneratorAction.cc
0027 /// \brief Implementation of the B3::PrimaryGeneratorAction class
0028
0029 #include "PrimaryGeneratorAction.hh"
0030
0031 #include "G4ChargedGeantino.hh"
0032 #include "G4IonTable.hh"
0033 #include "G4ParticleGun.hh"
0034 #include "G4ParticleTable.hh"
0035 #include "G4SystemOfUnits.hh"
0036 #include "Randomize.hh"
0037
0038 namespace B3
0039 {
0040
0041 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0042
0043 PrimaryGeneratorAction::PrimaryGeneratorAction()
0044 {
0045   G4int n_particle = 1;
0046   fParticleGun = new G4ParticleGun(n_particle);
0047
0048   // default particle kinematic
0049
0050   G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
0051   G4ParticleDefinition* particle = particleTable->FindParticle("chargedgeantino");
0052   fParticleGun->SetParticleDefinition(particle);
0053   fParticleGun->SetParticlePosition(G4ThreeVector(0., 0., 0.));
0054   fParticleGun->SetParticleEnergy(1 * eV);
0055   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(1., 0., 0.));
0056 }
0057
0058 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0059
0060 PrimaryGeneratorAction::~PrimaryGeneratorAction()
0061 {
0062   delete fParticleGun;
0063 }
0064
0065 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0066
0067 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* event)
0068 {
0069   G4ParticleDefinition* particle = fParticleGun->GetParticleDefinition();
0070   if (particle == G4ChargedGeantino::ChargedGeantino()) {
0071     // fluorine
0072     G4int Z = 9, A = 18;
0073     G4double ionCharge = 0. * eplus;
0074     G4double excitEnergy = 0. * keV;
0075
0076     G4ParticleDefinition* ion = G4IonTable::GetIonTable()->GetIon(Z, A, excitEnergy);
0077     fParticleGun->SetParticleDefinition(ion);
0078     fParticleGun->SetParticleCharge(ionCharge);
0079   }
0080
0081   // randomized position
0082   //
0083   /// G4double x0  = 0*cm, y0  = 0*cm, z0  = 0*cm;
0084   /// G4double dx0 = 0*cm, dy0 = 0*cm, dz0 = 0*cm;
0085   G4double x0 = 4 * cm, y0 = 4 * cm, z0 = 4 * cm;
0086   G4double dx0 = 1 * cm, dy0 = 1 * cm, dz0 = 1 * cm;
0087   x0 += dx0 * (G4UniformRand() - 0.5);
0088   y0 += dy0 * (G4UniformRand() - 0.5);
0089   z0 += dz0 * (G4UniformRand() - 0.5);
0090   fParticleGun->SetParticlePosition(G4ThreeVector(x0, y0, z0));
0091
0092   // create vertex
0093   //
0094   fParticleGun->GeneratePrimaryVertex(event);
0095 }
0096
0097 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0098
0099 }  // namespace B3