G4PhotoElectricAngularGeneratorPolarized Class Reference

#include <G4PhotoElectricAngularGeneratorPolarized.hh>

Inheritance diagram for G4PhotoElectricAngularGeneratorPolarized:

Public Member Functions
	G4PhotoElectricAngularGeneratorPolarized ()
	~G4PhotoElectricAngularGeneratorPolarized ()
virtual G4ThreeVector &	SampleDirection (const G4DynamicParticle *dp, G4double eKinEnergy, G4int shellId, 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

Protected Member Functions
G4ThreeVector	PerpendicularVector (const G4ThreeVector &a) const

Additional Inherited Members
Protected Attributes inherited from G4VEmAngularDistribution
G4ThreeVector	fLocalDirection

Detailed Description

Definition at line 52 of file G4PhotoElectricAngularGeneratorPolarized.hh.

Constructor & Destructor Documentation

G4PhotoElectricAngularGeneratorPolarized::G4PhotoElectricAngularGeneratorPolarized

(

)

Definition at line 70 of file G4PhotoElectricAngularGeneratorPolarized.cc.

References FatalException, and G4Exception().

  :G4VEmAngularDistribution("AngularGenSauterGavrilaPolarized")
{
  const G4int arrayDim = 980;

  //minimum electron beta parameter allowed
  betaArray[0] = 0.02;
  //beta step
  betaArray[1] = 0.001;
  //maximum index array for a and c tables
  betaArray[2] = arrayDim - 1;

  // read Majorant Surface Parameters. This are required in order to generate Gavrila angular photoelectron distribution
  for(G4int level = 0; level < 2; level++){

    char nameChar0[100] = "ftab0.dat"; // K-shell Majorant Surface Parameters
    char nameChar1[100] = "ftab1.dat"; // L-shell Majorant Surface Parameters

    G4String filename;
    if(level == 0) filename = nameChar0;
    if(level == 1) filename = nameChar1;

    char* path = getenv("G4LEDATA");
    if (!path)
      {
        G4String excep = "G4EMDataSet - G4LEDATA environment variable not set";
        G4Exception("G4PhotoElectricAngularGeneratorPolarized::G4PhotoElectricAngularGeneratorPolarized",
            "em0006",FatalException,"G4LEDATA environment variable not set");
    return;
      }

    G4String pathString(path);
    G4String dirFile = pathString + "/photoelectric_angular/" + filename;
    std::ifstream infile(dirFile);
    if (!infile.is_open())
      {
    G4String excep = "data file: " + dirFile + " not found";
        G4Exception("G4PhotoElectricAngularGeneratorPolarized::G4PhotoElectricAngularGeneratorPolarized",
            "em0003",FatalException,excep);
    return;
      }

    // Read parameters into tables. The parameters are function of incident electron energy and shell level
    G4float aRead=0,cRead=0, beta=0;
    for(G4int i=0 ; i<arrayDim ;i++){
      //fscanf(infile,"%f\t %e\t %e",&beta,&aRead,&cRead);
      infile >> beta >> aRead >> cRead;    
      aMajorantSurfaceParameterTable[i][level] = aRead;    
      cMajorantSurfaceParameterTable[i][level] = cRead;
    }
    infile.close();
  }
}

G4PhotoElectricAngularGeneratorPolarized::~G4PhotoElectricAngularGeneratorPolarized

(

)

Definition at line 124 of file G4PhotoElectricAngularGeneratorPolarized.cc.

{}

Member Function Documentation

G4ThreeVector G4PhotoElectricAngularGeneratorPolarized::PerpendicularVector ( const G4ThreeVector &  a ) const

protected

Definition at line 413 of file G4PhotoElectricAngularGeneratorPolarized.cc.

References test::x, CLHEP::Hep3Vector::x(), CLHEP::Hep3Vector::y(), z, and CLHEP::Hep3Vector::z().

{
  G4double dx = a.x();
  G4double dy = a.y();
  G4double dz = a.z();
  G4double x = dx < 0.0 ? -dx : dx;
  G4double y = dy < 0.0 ? -dy : dy;
  G4double z = dz < 0.0 ? -dz : dz;
  if (x < y) {
    return x < z ? G4ThreeVector(-dy,dx,0) : G4ThreeVector(0,-dz,dy);
  }else{
    return y < z ? G4ThreeVector(dz,0,-dx) : G4ThreeVector(-dy,dx,0);
  }
}

void G4PhotoElectricAngularGeneratorPolarized::PrintGeneratorInformation

(

)

const

Definition at line 402 of file G4PhotoElectricAngularGeneratorPolarized.cc.

References G4cout, and G4endl.

{
  G4cout << "\n" << G4endl;
  G4cout << "Polarized Photoelectric Angular Generator" << G4endl;
  G4cout << "PhotoElectric Electron Angular Generator based on the general Gavrila photoelectron angular distribution" << G4endl;
  G4cout << "Includes polarization effects for K and L1 atomic shells, according to Gavrilla (1959, 1961)." << G4endl;
  G4cout << "For higher shells the L1 cross-section is used." << G4endl;
  G4cout << "(see Physics Reference Manual) \n" << G4endl;
} 

G4ThreeVector & G4PhotoElectricAngularGeneratorPolarized::SampleDirection ( const G4DynamicParticle *  dp, G4double  eKinEnergy, G4int  shellId, const G4Material *  mat = 0  )

virtual

Implements G4VEmAngularDistribution.

Definition at line 128 of file G4PhotoElectricAngularGeneratorPolarized.cc.

References python.hepunit::electron_mass_c2, G4VEmAngularDistribution::fLocalDirection, G4DynamicParticle::GetMomentumDirection(), and G4DynamicParticle::GetPolarization().

{
  // (shellId == 0) - K-shell  - Polarized model for K-shell
  // (shellId > 0)  - L1-shell - Polarized model for L1 and higher shells

  // Calculate Lorentz term (gamma) and beta parameters
  G4double gamma = 1 + eKinEnergy/electron_mass_c2;
  G4double beta  = std::sqrt((gamma - 1)*(gamma + 1))/gamma;

  const G4ThreeVector& direction = dp->GetMomentumDirection();
  const G4ThreeVector& polarization = dp->GetPolarization();

  G4double theta, phi = 0;
  // Majorant surface parameters 
  // function of the outgoing electron kinetic energy
  G4double aBeta = 0; 
  G4double cBeta = 0; 

  // For the outgoing kinetic energy 
  // find the current majorant surface parameters
  PhotoElectronGetMajorantSurfaceAandCParameters(shellId, beta, &aBeta, &cBeta);

  // Generate pho and theta according to the shell level 
  // and beta parameter of the electron
  PhotoElectronGeneratePhiAndTheta(shellId, beta, aBeta, cBeta, &phi, &theta);

  // Determine the rotation matrix
  const G4RotationMatrix rotation = 
    PhotoElectronRotationMatrix(direction, polarization);

  // Compute final direction of the outgoing electron
  fLocalDirection = PhotoElectronComputeFinalDirection(rotation, theta, phi);

  return fLocalDirection;
}

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

• G4PhotoElectricAngularGeneratorPolarized.hh
• G4PhotoElectricAngularGeneratorPolarized.cc