vtk/src/PrimaryGeneratorAction.cc

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0026 //
0027 /// \file B1/src/PrimaryGeneratorAction.cc
0028 /// \brief Implementation of the B1::PrimaryGeneratorAction class
0029
0030 #include "PrimaryGeneratorAction.hh"
0031
0032 #include "G4Box.hh"
0033 #include "G4LogicalVolume.hh"
0034 #include "G4LogicalVolumeStore.hh"
0035 #include "G4ParticleDefinition.hh"
0036 #include "G4ParticleGun.hh"
0037 #include "G4ParticleTable.hh"
0038 #include "G4RunManager.hh"
0039 #include "G4SystemOfUnits.hh"
0040 #include "Randomize.hh"
0041
0042 namespace VtkVis
0043 {
0044
0045 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0046
0047 PrimaryGeneratorAction::PrimaryGeneratorAction()
0048 {
0049   G4int n_particle = 1;
0050   fParticleGun = new G4ParticleGun(n_particle);
0051
0052   // default particle kinematic
0053   G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
0054   G4String particleName;
0055   G4ParticleDefinition* particle = particleTable->FindParticle(particleName = "e-");
0056   fParticleGun->SetParticleDefinition(particle);
0057   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0., 0., 1.));
0058   fParticleGun->SetParticleEnergy(16.5 * GeV);
0059 }
0060
0061 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0062
0063 PrimaryGeneratorAction::~PrimaryGeneratorAction()
0064 {
0065   delete fParticleGun;
0066 }
0067
0068 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0069
0070 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0071 {
0072   // this function is called at the begining of ecah event
0073   //
0074
0075   // In order to avoid dependence of PrimaryGeneratorAction
0076   // on DetectorConstruction class we get Envelope volume
0077   // from G4LogicalVolumeStore.
0078
0079   G4double envSizeXY = 0;
0080   G4double envSizeZ = 0;
0081
0082   if (!fEnvelopeBox) {
0083     G4LogicalVolume* envLV = G4LogicalVolumeStore::GetInstance()->GetVolume("Envelope");
0084     if (envLV) fEnvelopeBox = dynamic_cast<G4Box*>(envLV->GetSolid());
0085   }
0086
0087   if (fEnvelopeBox) {
0088     envSizeXY = fEnvelopeBox->GetXHalfLength() * 2.;
0089     envSizeZ = fEnvelopeBox->GetZHalfLength() * 2.;
0090   }
0091   else {
0092     G4ExceptionDescription msg;
0093     msg << "Envelope volume of box shape not found.\n";
0094     msg << "Perhaps you have changed geometry.\n";
0095     msg << "The gun will be place at the center.";
0096     G4Exception("PrimaryGeneratorAction::GeneratePrimaries()", "MyCode0002", JustWarning, msg);
0097   }
0098
0099   G4double size = 0.8;
0100   G4double x0 = size * envSizeXY * (G4UniformRand() - 0.5);
0101   G4double y0 = size * envSizeXY * (G4UniformRand() - 0.5);
0102   G4double z0 = 0.5 * envSizeZ;
0103
0104   fParticleGun->SetParticlePosition(G4ThreeVector(0, 0, -z0));
0105
0106   fParticleGun->GeneratePrimaryVertex(anEvent);
0107 }
0108
0109 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0110
0111 }  // namespace VtkVis