G4SauterGavrilaAngularDistribution Class Reference

#include <G4SauterGavrilaAngularDistribution.hh>

Inheritance diagram for G4SauterGavrilaAngularDistribution:

Public Member Functions
	G4SauterGavrilaAngularDistribution ()
virtual	~G4SauterGavrilaAngularDistribution ()
virtual G4ThreeVector &	SampleDirection (const G4DynamicParticle *dp, G4double e=0.0, G4int shellId=0, const G4Material *mat=0)
void	PrintGeneratorInformation () const
Public Member Functions inherited from G4VEmAngularDistribution
	G4VEmAngularDistribution (const G4String &name)
virtual	~G4VEmAngularDistribution ()
virtual G4ThreeVector &	SampleDirectionForShell (const G4DynamicParticle *dp, G4double finalTotalEnergy, G4int Z, G4int shellID, const G4Material *)
const G4String &	GetName () const

Additional Inherited Members
Protected Attributes inherited from G4VEmAngularDistribution
G4ThreeVector	fLocalDirection

Detailed Description

Definition at line 55 of file G4SauterGavrilaAngularDistribution.hh.

Constructor & Destructor Documentation

G4SauterGavrilaAngularDistribution::G4SauterGavrilaAngularDistribution

(

)

Definition at line 48 of file G4SauterGavrilaAngularDistribution.cc.

  : G4VEmAngularDistribution("AngularGenSauterGavrila")
{}    

G4SauterGavrilaAngularDistribution::~G4SauterGavrilaAngularDistribution ( )

virtual

Definition at line 52 of file G4SauterGavrilaAngularDistribution.cc.

{}

Member Function Documentation

void G4SauterGavrilaAngularDistribution::PrintGeneratorInformation

(

)

const

Definition at line 94 of file G4SauterGavrilaAngularDistribution.cc.

References G4cout, and G4endl.

{
  G4cout << "\n" << G4endl;
  G4cout << "Non-polarized photoelectric effect angular generator." << G4endl;
  G4cout << "The Sauter-Gavrila distribution for the K-shell is used."<<G4endl;
  G4cout << "Originally developed by M.Maire for Geant3" 
     << G4endl;
} 

G4ThreeVector & G4SauterGavrilaAngularDistribution::SampleDirection ( const G4DynamicParticle *  dp, G4double  e = 0.0, G4int  shellId = 0, const G4Material *  mat = 0  )

virtual

Implements G4VEmAngularDistribution.

Definition at line 56 of file G4SauterGavrilaAngularDistribution.cc.

References python.hepunit::electron_mass_c2, G4VEmAngularDistribution::fLocalDirection, g(), G4UniformRand, G4DynamicParticle::GetKineticEnergy(), G4DynamicParticle::GetMomentumDirection(), CLHEP::Hep3Vector::rotateUz(), CLHEP::Hep3Vector::set(), and z.

{
  G4double tau = dp->GetKineticEnergy()/electron_mass_c2;
  static const G4double taulimit = 50.0;

  if (tau > taulimit) {
    fLocalDirection = dp->GetMomentumDirection(); 
    // Bugzilla 1120
    // SI on 05/09/2010 as suggested by JG 04/09/10 
  } else {
    // algorithm according Penelope 2008 manual and 
    // F.Sauter Ann. Physik 9, 217(1931); 11, 454(1931). 

    G4double gamma = tau + 1;
    G4double beta  = std::sqrt(tau*(tau + 2))/gamma;
    G4double A     = (1 - beta)/beta;
    G4double Ap2   = A + 2;
    G4double B     = 0.5*beta*gamma*(gamma - 1)*(gamma - 2);
    G4double grej  = 2*(1 + A*B)/A;
    G4double z, g;
    do { 
      G4double q = G4UniformRand();
      z = 2*A*(2*q + Ap2*std::sqrt(q))/(Ap2*Ap2 - 4*q); 
      g = (2 - z)*(1.0/(A + z) + B);

    } while(g < G4UniformRand()*grej);
 
    G4double cost = 1 - z;
    G4double sint = std::sqrt(z*(2 - z));
    G4double phi  = CLHEP::twopi*G4UniformRand(); 

    fLocalDirection.set(sint*std::cos(phi), sint*std::sin(phi), cost);
    fLocalDirection.rotateUz(dp->GetMomentumDirection());
  }
  return fLocalDirection;
}

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

• G4SauterGavrilaAngularDistribution.hh
• G4SauterGavrilaAngularDistribution.cc