PrimaryGeneratorAction0 Class Reference

#include <PrimaryGeneratorAction0.hh>

Public Member Functions
	PrimaryGeneratorAction0 (G4ParticleGun *)
	~PrimaryGeneratorAction0 ()
void	GeneratePrimaries (G4Event *)

Detailed Description

Definition at line 46 of file PrimaryGeneratorAction0.hh.

Constructor & Destructor Documentation

PrimaryGeneratorAction0::PrimaryGeneratorAction0

(

G4ParticleGun *

gun

)

Definition at line 45 of file PrimaryGeneratorAction0.cc.

: fParticleGun(gun)
{
  //solid angle
  //
  G4double alphaMin =  0*deg;      //alpha in [0,pi]
  G4double alphaMax = 60*deg;
  fCosAlphaMin = std::cos(alphaMin);
  fCosAlphaMax = std::cos(alphaMax);
  
  fPsiMin = 0*deg;       //psi in [0, 2*pi]
  fPsiMax = 360*deg;
}

PrimaryGeneratorAction0::~PrimaryGeneratorAction0

(

)

Definition at line 61 of file PrimaryGeneratorAction0.cc.

{ }

Member Function Documentation

void PrimaryGeneratorAction0::GeneratePrimaries

(

G4Event *

anEvent

)

Definition at line 66 of file PrimaryGeneratorAction0.cc.

{  
  //vertex position fixed
  //
  G4double x0 = 0*mm, y0 = 0*mm, z0 = 0*mm;
  fParticleGun->SetParticlePosition(G4ThreeVector(x0,y0,z0));

  //direction uniform in solid angle
  //
  G4double cosAlpha = fCosAlphaMin-G4UniformRand()*(fCosAlphaMin-fCosAlphaMax);
  G4double sinAlpha = std::sqrt(1. - cosAlpha*cosAlpha);
  G4double psi = fPsiMin + G4UniformRand()*(fPsiMax - fPsiMin);

  G4double ux = sinAlpha*std::cos(psi),
           uy = sinAlpha*std::sin(psi),
           uz = cosAlpha;

  fParticleGun->SetParticleMomentumDirection(G4ThreeVector(ux,uy,uz));
  
  fParticleGun->GeneratePrimaryVertex(anEvent);
}

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

• source/geant4.10.03.p03/examples/extended/eventgenerator/particleGun/include/PrimaryGeneratorAction0.hh
• source/geant4.10.03.p03/examples/extended/eventgenerator/particleGun/src/PrimaryGeneratorAction0.cc