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This commit is contained in:
Gabriele Cosmo
2018-06-29 10:58:11 +02:00
parent fe81a77428
commit 6aa23be517
1581 changed files with 124288 additions and 83758 deletions
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source/processes/electromagnetic/standard/src/G4DipBustGenerator.cc
+63 -60
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@@ -23,7 +23,7 @@
// * acceptance of all terms of the Geant4 Software license. *
// ********************************************************************
//
// $Id: G4DipBustGenerator.cc 74581 2013-10-15 12:03:25Z gcosmo $
// $Id: G4DipBustGenerator.cc 110415 2018-05-23 06:44:31Z gcosmo $
//
// -------------------------------------------------------------------
//
@@ -51,94 +51,95 @@
//
#include "G4DipBustGenerator.hh"
#include "G4PhysicalConstants.hh"
#include "Randomize.hh"
#include "G4Log.hh"
#include "G4Exp.hh"
#include <CLHEP/Units/PhysicalConstants.h>
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
G4DipBustGenerator::G4DipBustGenerator(const G4String&)
: G4VEmAngularDistribution("DipBustGen")
{}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
G4DipBustGenerator::~G4DipBustGenerator()
{}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
G4double G4DipBustGenerator::SampleCosTheta(G4double kinEnergy)
{
G4double c = 4. - 8.*G4UniformRand();
G4double delta = 0.5*(std::sqrt(c*c+4.) + std::abs(c));
G4double signc = (c < 0.) ? -1.0 : 1.0;
G4double cofA = -signc*G4Exp(G4Log(delta)/3.0);
G4double cosTheta = cofA - 1./cofA;
G4double tau = kinEnergy/CLHEP::electron_mass_c2;
G4double beta = std::sqrt(tau*(tau + 2.))/(tau + 1.);
return (cosTheta + beta)/(1 + cosTheta*beta);
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
G4ThreeVector&
G4DipBustGenerator::SampleDirection(const G4DynamicParticle* dp,
G4double, G4int, const G4Material*)
{
G4double a, c, cosTheta, delta, cofA, signc = 1.;
G4double eTkin = dp->GetKineticEnergy();
c = 4. - 8.*G4UniformRand();
a = c;
if( c < 0. )
{
signc = -1.;
a = -c;
}
delta = std::sqrt(a*a+4.);
delta += a;
delta *= 0.5;
cofA = -signc*G4Exp(G4Log(delta)/3.0);
cosTheta = cofA - 1./cofA;
G4double tau = eTkin/electron_mass_c2;
G4double beta = std::sqrt(tau*(tau + 2.))/(tau + 1.);
cosTheta = (cosTheta + beta)/(1 + cosTheta*beta);
G4double cosTheta = SampleCosTheta(dp->GetKineticEnergy());
G4double sinTheta = std::sqrt((1 - cosTheta)*(1 + cosTheta));
G4double phi = twopi*G4UniformRand();
G4double phi = CLHEP::twopi*G4UniformRand();
fLocalDirection.set(sinTheta*std::cos(phi), sinTheta*std::sin(phi),cosTheta);
fLocalDirection.rotateUz(dp->GetMomentumDirection());
return fLocalDirection;
}
G4double G4DipBustGenerator::PolarAngle(const G4double eTkin,
const G4double, // final_energy
const G4int ) // Z
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
G4double G4DipBustGenerator::PolarAngle(G4double eTkin,
G4double, // final_energy
G4int ) // Z
{
G4double c, cosTheta, delta, cofA, signc = 1., a;
G4double gamma, beta, theta;
c = 4. - 8.*G4UniformRand();
a = c;
if( c < 0. )
{
signc = -1.;
a = -c;
}
delta = std::sqrt(a*a+4.);
delta += a;
delta *= 0.5;
cofA = -signc*G4Exp(G4Log(delta)/3.0);
cosTheta = cofA - 1./cofA;
gamma = 1. + eTkin/electron_mass_c2;
beta = std::sqrt(1. - 1./gamma/gamma);
cosTheta = (cosTheta + beta)/(1 + cosTheta*beta);
theta = std::acos(cosTheta);
if( theta < 0. ) theta = 0.;
if( theta > pi ) theta = pi;
// G4cout <<"theta = "<<theta<<"; ";
G4double cosTheta = SampleCosTheta(eTkin);
G4double theta = std::acos(cosTheta);
theta = std::min(std::max(theta, 0.), CLHEP::pi);
return theta;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
void G4DipBustGenerator::SamplePairDirections(const G4DynamicParticle* dp,
G4double elecKinEnergy,
G4double posiKinEnergy,
G4ThreeVector& dirElectron,
G4ThreeVector& dirPositron,
G4int, const G4Material*)
{
G4double phi = CLHEP::twopi * G4UniformRand();
G4double sinp = std::sin(phi);
G4double cosp = std::cos(phi);
G4double cost = SampleCosTheta(elecKinEnergy);
G4double sint = std::sqrt((1. - cost)*(1. + cost));
dirElectron.set(sint*cosp, sint*sinp, cost);
dirElectron.rotateUz(dp->GetMomentumDirection());
cost = SampleCosTheta(posiKinEnergy);
sint = std::sqrt((1. - cost)*(1. + cost));
dirPositron.set(-sint*cosp, -sint*sinp, cost);
dirPositron.rotateUz(dp->GetMomentumDirection());
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
void G4DipBustGenerator::PrintGeneratorInformation() const
{
G4cout << "\n" << G4endl;
@@ -146,3 +147,5 @@ void G4DipBustGenerator::PrintGeneratorInformation() const
G4cout << "J.D. Jackson, Classical Electrodynamics, Wiley, New York 1975"
<< G4endl;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....