PrimaryGeneratorGun2 Class Reference

#include <PrimaryGeneratorGun2.hh>

Inheritance diagram for PrimaryGeneratorGun2:

Collaboration diagram for PrimaryGeneratorGun2:

Public Member Functions
	PrimaryGeneratorGun2 ()
	~PrimaryGeneratorGun2 ()
virtual void	GeneratePrimaries (G4Event *)
G4double	GetRadius ()
G4double	GetCosAlphaMin ()
G4double	GetCosAlphaMax ()
Public Member Functions inherited from G4VUserPrimaryGeneratorAction
	G4VUserPrimaryGeneratorAction ()
virtual	~G4VUserPrimaryGeneratorAction ()

Detailed Description

Definition at line 46 of file PrimaryGeneratorGun2.hh.

Constructor & Destructor Documentation

PrimaryGeneratorGun2::PrimaryGeneratorGun2

(

)

Definition at line 47 of file PrimaryGeneratorGun2.cc.

 : G4VUserPrimaryGeneratorAction(), fParticleGun(0)
{
  // default particle kinematic
  //
  G4int n_particle = 1;
  fParticleGun  = new G4ParticleGun(n_particle);
    
  G4ParticleDefinition* particle
           = G4ParticleTable::GetParticleTable()->FindParticle("geantino");
  fParticleGun->SetParticleDefinition(particle);
  fParticleGun->SetParticleEnergy(1*eV);
  
  // vertex 
  //  
  fRadius = 8.*mm;
  
  //opening angle
  //
  G4double alphaMin =  91.*deg;
  G4double alphaMax = 180.*deg;
  fCosAlphaMin = std::cos(alphaMin);
  fCosAlphaMax = std::cos(alphaMax);  
}

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PrimaryGeneratorGun2::~PrimaryGeneratorGun2

(

)

Definition at line 74 of file PrimaryGeneratorGun2.cc.

{
  delete fParticleGun;  
}

Member Function Documentation

void PrimaryGeneratorGun2::GeneratePrimaries ( G4Event *  anEvent )

virtual

Implements G4VUserPrimaryGeneratorAction.

Definition at line 81 of file PrimaryGeneratorGun2.cc.

{
  //vertex position uniform in sphere
  //
  G4double cosTheta = 2*G4UniformRand() - 1;  //cosTheta uniform in [0, pi]
  G4double sinTheta = std::sqrt(1. - cosTheta*cosTheta);
  G4double phi      = twopi*G4UniformRand();  //phi uniform in [0, 2*pi]
  G4ThreeVector ur(sinTheta*std::cos(phi),sinTheta*std::sin(phi),cosTheta);

  fParticleGun->SetParticlePosition(fRadius*ur);

  //particle direction uniform around ur 
  //
  //1- in World frame
  //cosAlpha uniform in [cos(alphaMin), cos(alphaMax)]
  G4double cosAlpha = fCosAlphaMin-G4UniformRand()*(fCosAlphaMin-fCosAlphaMax);
  G4double sinAlpha = std::sqrt(1. - cosAlpha*cosAlpha);
  //psi uniform in (0,2*pi)
  G4double psi      = twopi*G4UniformRand();
  G4ThreeVector dir(sinAlpha*std::cos(psi),sinAlpha*std::sin(psi),cosAlpha);

  //2- rotate dir   (rotateUz transforms uz to ur)
  dir.rotateUz(ur);           

  fParticleGun->SetParticleMomentumDirection(dir);

  //create vertex
  //
  fParticleGun->GeneratePrimaryVertex(anEvent);
}

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G4double PrimaryGeneratorGun2::GetCosAlphaMax ( )

inline

Definition at line 57 of file PrimaryGeneratorGun2.hh.

{return fCosAlphaMax;};

G4double PrimaryGeneratorGun2::GetCosAlphaMin ( )

inline

Definition at line 56 of file PrimaryGeneratorGun2.hh.

{return fCosAlphaMin;};

G4double PrimaryGeneratorGun2::GetRadius ( )

inline

Definition at line 55 of file PrimaryGeneratorGun2.hh.

{return fRadius;};

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

• source/geant4.10.03.p03/examples/extended/eventgenerator/GunGPS/include/PrimaryGeneratorGun2.hh
• source/geant4.10.03.p03/examples/extended/eventgenerator/GunGPS/src/PrimaryGeneratorGun2.cc