OpNovice/src/OpNovicePrimaryGeneratorAction.cc

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0026 /// \file OpNovice/src/OpNovicePrimaryGeneratorAction.cc
0027 /// \brief Implementation of the OpNovicePrimaryGeneratorAction class
0028 //
0029 //
0030 //
0031 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0032 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0033
0034 #include "OpNovicePrimaryGeneratorAction.hh"
0035
0036 #include "OpNovicePrimaryGeneratorMessenger.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 OpNovicePrimaryGeneratorAction::OpNovicePrimaryGeneratorAction()
0047   : G4VUserPrimaryGeneratorAction(), fParticleGun(nullptr)
0048 {
0049   G4int n_particle = 1;
0050   fParticleGun = new G4ParticleGun(n_particle);
0051   // create a messenger for this class
0052   fGunMessenger = new OpNovicePrimaryGeneratorMessenger(this);
0053   // default kinematic
0054   //
0055   G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
0056   G4ParticleDefinition* particle = particleTable->FindParticle("e+");
0057
0058   fParticleGun->SetParticleDefinition(particle);
0059   fParticleGun->SetParticleTime(0.0 * ns);
0060   fParticleGun->SetParticlePosition(G4ThreeVector(0., 0., 0.));
0061   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(1., 0., 0.));
0062   fParticleGun->SetParticleEnergy(500.0 * keV);
0063 }
0064
0065 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0066 OpNovicePrimaryGeneratorAction::~OpNovicePrimaryGeneratorAction()
0067 {
0068   delete fParticleGun;
0069   delete fGunMessenger;
0070 }
0071
0072 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0073 void OpNovicePrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0074 {
0075   fParticleGun->GeneratePrimaryVertex(anEvent);
0076 }
0077
0078 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0079 void OpNovicePrimaryGeneratorAction::SetOptPhotonPolar()
0080 {
0081   G4double angle = G4UniformRand() * 360.0 * deg;
0082   SetOptPhotonPolar(angle);
0083 }
0084
0085 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0086 void OpNovicePrimaryGeneratorAction::SetOptPhotonPolar(G4double angle)
0087 {
0088   if (fParticleGun->GetParticleDefinition()->GetParticleName() != "opticalphoton") {
0089     G4ExceptionDescription ed;
0090     ed << "Warning: the particleGun is not an opticalphoton";
0091     G4Exception("OpNovicePrimaryGeneratorAction::SetOptPhotonPolar()", "OpNovice_010", JustWarning,
0092                 ed);
0093     return;
0094   }
0095
0096   G4ThreeVector normal(1., 0., 0.);
0097   G4ThreeVector kphoton = fParticleGun->GetParticleMomentumDirection();
0098   G4ThreeVector product = normal.cross(kphoton);
0099   G4double modul2 = product * product;
0100
0101   G4ThreeVector e_perpend(0., 0., 1.);
0102   if (modul2 > 0.) e_perpend = (1. / std::sqrt(modul2)) * product;
0103   G4ThreeVector e_paralle = e_perpend.cross(kphoton);
0104
0105   G4ThreeVector polar = std::cos(angle) * e_paralle + std::sin(angle) * e_perpend;
0106   fParticleGun->SetParticlePolarization(polar);
0107 }
0108 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......