Geant4 LXR

Cross-Referencing   Geant4
Geant4/examples/extended/hadronic/FissionFragment/src/FFPrimaryGeneratorAction.cc

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  // -------------------------------------------------------------
  //  =============== Begin Documentation Comments ===============
  //!
  //! \file       FFPrimaryGeneratorAction.cc
  //! \author     B. Wendt (brycen.linn.wendt@cern.ch)
  //! \date       June 06, 2014
  //!
  //! \brief      Implementation of the FFPrimaryGeneratorAction class
  //!
  //! \details    Generates 4.5 MeV neutrons from the solid volume defined in
  //!             FFDetectorConstruction as "NeturonSource" and shoots them off
  //!             in a isotropically sampled direction
  //!
  //  ================ End Documentation Comments ================
  //
  //  Modified:
  //
  //  23-06-14                                              BWendt
  //  Implemented "GetNeutronSourceCenter()" and added code to correctly sample
  //  the neutron starting location
  //
  // -------------------------------------------------------------
  
  #include "FFPrimaryGeneratorAction.hh"
  
  #include "G4Event.hh"
  #include "G4LogicalVolume.hh"
  #include "G4LogicalVolumeStore.hh"
  #include "G4Neutron.hh"
  #include "G4ParticleGun.hh"
  #include "G4PhysicalVolumeStore.hh"
  #include "G4SystemOfUnits.hh"
  #include "G4Tubs.hh"
  #include "G4VPhysicalVolume.hh"
  #include "Randomize.hh"
  #include "globals.hh"
  
  //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
  FFPrimaryGeneratorAction::FFPrimaryGeneratorAction()
    : G4VUserPrimaryGeneratorAction(),
  #ifndef NDEBUG
      fEventNumber(0),
  #endif  // NDEBUG
      fH2OPhysical(NULL),
      fNeutronPhysical(NULL),
      fNeutronSolid(NULL),
      fParticleGun(new G4ParticleGun(1)),
      fTankPhysical(NULL)
  {
    fParticleGun->SetParticleDefinition(G4Neutron::Definition());
    fParticleGun->SetParticleEnergy(4.5 * MeV);
  }
  
  //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
  void FFPrimaryGeneratorAction::GeneratePrimaries(G4Event* event)
  {
  #ifndef NDEBUG
    G4cout << "Shooting event " << ++fEventNumber << G4endl;
  #endif  // NDEBUG
    const G4ThreeVector sourceCenter = GetNeutronSourceCenter();
  
    // Sample the neutron source location
    const G4double radius = fNeutronSolid->GetOuterRadius();
    const G4double z = fNeutronSolid->GetZHalfLength() * 2;
    G4ThreeVector randomLocation;
    randomLocation.setRThetaPhi(radius * std::sqrt(G4UniformRand()), G4UniformRand() * 180 * deg, 0);
    randomLocation.setZ(z * (G4UniformRand() - 0.5));
    G4ThreeVector location(randomLocation.x() + sourceCenter.x(),
                           randomLocation.y() + sourceCenter.y(),
                           randomLocation.z() + sourceCenter.z());
  #ifndef NDEBUG
    G4cout << "Emission Location: r: " << location << G4endl;
  #endif  // NDEBUG
  
   // Sample the neutron emission direction
   G4ThreeVector direction;
   direction.setRThetaPhi(1.0, std::acos(G4UniformRand() * 2 - 1),
                          (G4UniformRand() * 2 - 1) * 180 * deg);
 #ifndef NDEBUG
   G4cout << "Emission Direction: r: " << direction << G4endl;
 #endif  // NDEBUG
 
   // Load the event
   fParticleGun->SetParticlePosition(location);
   fParticleGun->SetParticleMomentumDirection(direction);
   fParticleGun->GeneratePrimaryVertex(event);
 }
 
 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 G4ThreeVector FFPrimaryGeneratorAction::GetNeutronSourceCenter(void)
 {
   // Get the dimensions of the neutron source
   if (fNeutronSolid == NULL) {
     G4LogicalVolume* temp = G4LogicalVolumeStore::GetInstance()->GetVolume("NeutronSource");
     if (temp != NULL) {
       fNeutronSolid = dynamic_cast<G4Tubs*>(temp->GetSolid());
     }
 
     if (fNeutronSolid == NULL) {
       G4Exception(
         "FFPrimaryGeneratorAction::"
         "GeneratePrimaries(G4Event*)",
         "Neutron source solid volume not found", EventMustBeAborted, "This run will be aborted");
     }
   }
 
   // Get the position of the neutron source within the water
   if (fNeutronPhysical == NULL) {
     fNeutronPhysical = G4PhysicalVolumeStore::GetInstance()->GetVolume("NeutronSource");
   }
 
   if (fNeutronPhysical == NULL) {
     G4Exception("FFPrimaryGeneratorAction::GetNeutronSourceCenter(void)",
                 "Neutron source physical volume not found", EventMustBeAborted,
                 "This run will be aborted");
   }
 
   // Get the position of the water within the tank
   if (fH2OPhysical == NULL) {
     fH2OPhysical = G4PhysicalVolumeStore::GetInstance()->GetVolume("Tank_H2O");
 
     if (fH2OPhysical == NULL) {
       G4Exception(
         "FFPrimaryGeneratorAction::"
         "GetNeutronSourceCenter(void)",
         "Tank H2O physical volume not found", EventMustBeAborted, "This run will be aborted");
     }
   }
 
   // Get the position of the tank within the world
   if (fTankPhysical == NULL) {
     fTankPhysical = G4PhysicalVolumeStore::GetInstance()->GetVolume("Tank_Wall");
 
     if (fTankPhysical == NULL) {
       G4Exception(
         "FFPrimaryGeneratorAction::"
         "GetNeutronSourceCenter(void)",
         "Tank physical volume not found", EventMustBeAborted, "This run will be aborted");
     }
   }
 
   return fNeutronPhysical->GetTranslation() + fH2OPhysical->GetTranslation()
          + fTankPhysical->GetTranslation();
 }
 
 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 FFPrimaryGeneratorAction::~FFPrimaryGeneratorAction()
 {
   delete fParticleGun;
 }