The primary generator action class with particle gum. More...

#include <Doxymodules_basic.h>

Inheritance diagram for B2::PrimaryGeneratorAction:

Public Member Functions
	PrimaryGeneratorAction ()

	~PrimaryGeneratorAction () override

void	GeneratePrimaries (G4Event *) override

G4ParticleGun *	GetParticleGun ()

Private Attributes
G4ParticleGun *	fParticleGun = nullptr

Detailed Description

The primary generator action class with particle gum.

It defines a single particle which hits the Tracker perpendicular to the input face. The type of the particle can be changed via the G4 build-in commands of G4ParticleGun class (see the macros provided with this example).

Definition at line 44 of file Doxymodules_basic.h.

Constructor & Destructor Documentation

◆ PrimaryGeneratorAction()

B2::PrimaryGeneratorAction::PrimaryGeneratorAction ( )

Definition at line 47 of file PrimaryGeneratorAction.cc.

{
  G4int nofParticles = 1;
  fParticleGun = new G4ParticleGun(nofParticles);
 
  // default particle kinematic
 
  G4ParticleDefinition* particleDefinition
    = G4ParticleTable::GetParticleTable()->FindParticle("proton");
 
  fParticleGun->SetParticleDefinition(particleDefinition);
  fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0.,0.,1.));
  fParticleGun->SetParticleEnergy(3.0*GeV);
}

◆ ~PrimaryGeneratorAction()

B2::PrimaryGeneratorAction::~PrimaryGeneratorAction ( )

override

Definition at line 64 of file PrimaryGeneratorAction.cc.

{
  delete fParticleGun;
}

Member Function Documentation

◆ GeneratePrimaries()

void B2::PrimaryGeneratorAction::GeneratePrimaries ( G4Event * anEvent )

override

Definition at line 71 of file PrimaryGeneratorAction.cc.

{
  // This function is called at the begining of event
 
  // In order to avoid dependence of PrimaryGeneratorAction
  // on DetectorConstruction class we get world volume
  // from G4LogicalVolumeStore.
 
  G4double worldZHalfLength = 0;
  G4LogicalVolume* worldLV
    = G4LogicalVolumeStore::GetInstance()->GetVolume("World");
  G4Box* worldBox = nullptr;
  if ( worldLV ) worldBox = dynamic_cast<G4Box*>(worldLV->GetSolid());
  if ( worldBox ) worldZHalfLength = worldBox->GetZHalfLength();
  else  {
    G4cerr << "World volume of box not found." << G4endl;
    G4cerr << "Perhaps you have changed geometry." << G4endl;
    G4cerr << "The gun will be place in the center." << G4endl;
  }
 
  // Note that this particular case of starting a primary particle on the world boundary
  // requires shooting in a direction towards inside the world.
  fParticleGun->SetParticlePosition(G4ThreeVector(0., 0., -worldZHalfLength));
 
  fParticleGun->GeneratePrimaryVertex(anEvent);
}

◆ GetParticleGun()

G4ParticleGun * B2::PrimaryGeneratorAction::GetParticleGun ( )

inline

Definition at line 57 of file PrimaryGeneratorAction.hh.

57{return fParticleGun;}

Member Data Documentation

◆ fParticleGun

G4ParticleGun* B2::PrimaryGeneratorAction::fParticleGun = nullptr

private

Definition at line 60 of file PrimaryGeneratorAction.hh.

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

.doxygen/Doxymodules_basic.h
basic/B2/B2a/include/PrimaryGeneratorAction.hh
basic/B2/B2a/src/PrimaryGeneratorAction.cc

Public Member Functions

Private Attributes