ExUCNPrimaryGeneratorAction Class Reference

#include <ExUCNPrimaryGeneratorAction.hh>

Inheritance diagram for ExUCNPrimaryGeneratorAction:

Collaboration diagram for ExUCNPrimaryGeneratorAction:

Public Member Functions
	ExUCNPrimaryGeneratorAction (void)
virtual	~ExUCNPrimaryGeneratorAction ()
virtual void	GeneratePrimaries (G4Event *)
Public Member Functions inherited from G4VUserPrimaryGeneratorAction
	G4VUserPrimaryGeneratorAction ()
virtual	~G4VUserPrimaryGeneratorAction ()

Detailed Description

Definition at line 46 of file ExUCNPrimaryGeneratorAction.hh.

Constructor & Destructor Documentation

ExUCNPrimaryGeneratorAction::ExUCNPrimaryGeneratorAction

(

void

)

Definition at line 49 of file ExUCNPrimaryGeneratorAction.cc.

{
  G4int n_particle = 1;
  fParticleGun  = new G4ParticleGun(n_particle);

  G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();

  G4ParticleDefinition* particle = particleTable->FindParticle("neutron");
  fParticleGun->SetParticleDefinition(particle);
}

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ExUCNPrimaryGeneratorAction::~ExUCNPrimaryGeneratorAction ( )

virtual

Definition at line 62 of file ExUCNPrimaryGeneratorAction.cc.

{
  delete fParticleGun;
}

Member Function Documentation

void ExUCNPrimaryGeneratorAction::GeneratePrimaries ( G4Event *  anEvent )

virtual

Implements G4VUserPrimaryGeneratorAction.

Definition at line 69 of file ExUCNPrimaryGeneratorAction.cc.

{
  // This function is called at the begining of event

  fParticleGun->SetParticlePosition(G4ThreeVector(0.0, 0.0, 0.0));
  fParticleGun->SetParticlePolarization(G4ThreeVector(0,1,0));

  G4double particleEnergy = 1e-9*eV + G4UniformRand()*(1e-7*eV-1e-9*eV);
  fParticleGun->SetParticleEnergy(particleEnergy);

  G4double theta = 2*pi*G4UniformRand();
  G4double phi = std::acos(1-2*G4UniformRand());
  if (phi > pi/2 && phi < pi) phi = pi-phi;

  G4double z = std::sin(phi)*std::cos(theta);
  G4double x = std::sin(phi)*std::sin(theta);
  G4double y = std::cos(phi);

  fParticleGun->SetParticleMomentumDirection(G4ThreeVector(x,y,z));

  fParticleGun->GeneratePrimaryVertex(anEvent);
}

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The documentation for this class was generated from the following files:

• source/geant4.10.03.p02/examples/extended/exoticphysics/ucn/include/ExUCNPrimaryGeneratorAction.hh
• source/geant4.10.03.p02/examples/extended/exoticphysics/ucn/src/ExUCNPrimaryGeneratorAction.cc