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 &	SampleDirection (const G4DynamicParticle *dp, G4double finalTotalEnergy, G4int Z, const G4Material *)=0
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::G4SauterGavrilaAngularDistribution

(

)

Definition at line 48 of file G4SauterGavrilaAngularDistribution.cc.

  : G4VEmAngularDistribution("AngularGenSauterGavrila")
{}    

~G4SauterGavrilaAngularDistribution()

G4SauterGavrilaAngularDistribution::~G4SauterGavrilaAngularDistribution ( )

virtual

Definition at line 52 of file G4SauterGavrilaAngularDistribution.cc.

{}

Member Function Documentation

PrintGeneratorInformation()

void G4SauterGavrilaAngularDistribution::PrintGeneratorInformation

(

)

const

Definition at line 95 of file G4SauterGavrilaAngularDistribution.cc.

{
  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;
} 

SampleDirection()

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.

{
  G4double tau = dp->GetKineticEnergy()/electron_mass_c2;
  const G4double taulimit = 30.0;
 
  if (tau > taulimit) {
    fLocalDirection = dp->GetMomentumDirection(); 
    // Bugzilla 1120
    // SI on 05/09/2010 as suggested by JG 04/09/10 
  } else {
 
    G4double invgamma  = 1.0/(tau + 1.0);
    G4double beta      = std::sqrt(tau*(tau + 2.0))*invgamma;
    G4double b         = 0.5*tau*(tau*tau - 1.0);
    G4double invgamma2 = invgamma*invgamma;
   
    G4double rndm,term,greject,grejsup,costeta,sint2;
    if (tau < 1.) { grejsup = (1.+b-beta*b)/invgamma2; }
    else          { grejsup = (1.+b+beta*b)/invgamma2; }
 
    do { 
      rndm    = 1 - 2*G4UniformRand();
      costeta = (rndm + beta)/(rndm*beta + 1);
      term    = invgamma2/(1 + beta*rndm);
      sint2   = (1 - costeta)*(1 + costeta);
      greject = sint2*(1 + b*term)/(term*term);
 
    } while(greject < G4UniformRand()*grejsup);
       
    G4double sinteta = std::sqrt(sint2);
    G4double phi  = CLHEP::twopi*G4UniformRand(); 
 
    fLocalDirection.set(sinteta*std::cos(phi), sinteta*std::sin(phi), costeta);
    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