userVisAction/src/B1PrimaryGeneratorAction.cc

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0025 //
0026 /// \file B1PrimaryGeneratorAction.cc
0027 /// \brief Implementation of the B1PrimaryGeneratorAction class
0028
0029 #include "B1PrimaryGeneratorAction.hh"
0030
0031 #include "G4Box.hh"
0032 #include "G4LogicalVolume.hh"
0033 #include "G4LogicalVolumeStore.hh"
0034 #include "G4ParticleDefinition.hh"
0035 #include "G4ParticleGun.hh"
0036 #include "G4ParticleTable.hh"
0037 #include "G4RunManager.hh"
0038 #include "G4SystemOfUnits.hh"
0039 #include "Randomize.hh"
0040
0041 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0042
0043 B1PrimaryGeneratorAction::B1PrimaryGeneratorAction()
0044   : G4VUserPrimaryGeneratorAction(), fParticleGun(0), fEnvelopeBox(0)
0045 {
0046   G4int n_particle = 1;
0047   fParticleGun = new G4ParticleGun(n_particle);
0048
0049   // default particle kinematic
0050   G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
0051   G4String particleName;
0052   G4ParticleDefinition* particle = particleTable->FindParticle(particleName = "gamma");
0053   fParticleGun->SetParticleDefinition(particle);
0054   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0., 0., 1.));
0055   fParticleGun->SetParticleEnergy(6. * MeV);
0056 }
0057
0058 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0059
0060 B1PrimaryGeneratorAction::~B1PrimaryGeneratorAction()
0061 {
0062   delete fParticleGun;
0063 }
0064
0065 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0066
0067 void B1PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0068 {
0069   // this function is called at the begining of ecah event
0070   //
0071
0072   // In order to avoid dependence of PrimaryGeneratorAction
0073   // on DetectorConstruction class we get Envelope volume
0074   // from G4LogicalVolumeStore.
0075
0076   G4double envSizeXY = 0;
0077   G4double envSizeZ = 0;
0078
0079   if (!fEnvelopeBox) {
0080     G4LogicalVolume* envLV = G4LogicalVolumeStore::GetInstance()->GetVolume("Envelope");
0081     if (envLV) fEnvelopeBox = dynamic_cast<G4Box*>(envLV->GetSolid());
0082   }
0083
0084   if (fEnvelopeBox) {
0085     envSizeXY = fEnvelopeBox->GetXHalfLength() * 2.;
0086     envSizeZ = fEnvelopeBox->GetZHalfLength() * 2.;
0087   }
0088   else {
0089     G4ExceptionDescription msg;
0090     msg << "Envelope volume of box shape not found.\n";
0091     msg << "Perhaps you have changed geometry.\n";
0092     msg << "The gun will be place at the center.";
0093     G4Exception("B1PrimaryGeneratorAction::GeneratePrimaries()", "MyCode0002", JustWarning, msg);
0094   }
0095
0096   G4double size = 0.8;
0097   G4double x0 = size * envSizeXY * (G4UniformRand() - 0.5);
0098   G4double y0 = size * envSizeXY * (G4UniformRand() - 0.5);
0099   G4double z0 = -0.5 * envSizeZ;
0100
0101   fParticleGun->SetParticlePosition(G4ThreeVector(x0, y0, z0));
0102
0103   fParticleGun->GeneratePrimaryVertex(anEvent);
0104 }
0105
0106 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......