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This commit is contained in:
Gabriele Cosmo
2016-06-10 14:11:04 +02:00
parent c9b32a6c0a
commit d4af681f38
4886 changed files with 420149 additions and 1023309 deletions
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source/processes/electromagnetic/dna/models/src/G4DNAScreenedRutherfordElasticModel.cc
+85 -65
View File
@@ -23,7 +23,7 @@
// * acceptance of all terms of the Geant4 Software license. *
// ********************************************************************
//
// $Id: G4DNAScreenedRutherfordElasticModel.cc 87137 2014-11-25 09:12:48Z gcosmo $
// $Id: G4DNAScreenedRutherfordElasticModel.cc 92074 2015-08-17 07:03:46Z gcosmo $
//
#include "G4DNAScreenedRutherfordElasticModel.hh"
@@ -67,6 +67,10 @@ G4DNAScreenedRutherfordElasticModel::G4DNAScreenedRutherfordElasticModel(const G
<< G4endl;
}
fParticleChangeForGamma = 0;
// Selection of computation method
// We do not recommend "true" usage with the current cumul. proba. settings
fasterCode = false;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
@@ -206,7 +210,7 @@ G4double G4DNAScreenedRutherfordElasticModel::CrossSectionPerVolume(const G4Mate
}
return sigma*material->GetAtomicNumDensityVector()[1];
return sigma*waterDensity;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
@@ -365,70 +369,78 @@ G4double G4DNAScreenedRutherfordElasticModel::BrennerZaiderRandomizeCosTheta(G4d
}
// ***** Original method
if (!fasterCode)
{
G4double oneOverMax = 1.
G4double oneOverMax = 1.
/ (1. / (4. * gamma * gamma) + beta
/ ((2. + 2. * delta) * (2. + 2. * delta)));
G4double cosTheta = 0.;
G4double leftDenominator = 0.;
G4double rightDenominator = 0.;
G4double fCosTheta = 0.;
G4double cosTheta = 0.;
G4double leftDenominator = 0.;
G4double rightDenominator = 0.;
G4double fCosTheta = 0.;
do
{
cosTheta = 2. * G4UniformRand()- 1.;
do
{
cosTheta = 2. * G4UniformRand()- 1.;
leftDenominator = (1. + 2.*gamma - cosTheta);
rightDenominator = (1. + 2.*delta + cosTheta);
if ( (leftDenominator * rightDenominator) != 0. )
{
fCosTheta = oneOverMax * (1./(leftDenominator*leftDenominator) + beta/(rightDenominator*rightDenominator));
}
leftDenominator = (1. + 2.*gamma - cosTheta);
rightDenominator = (1. + 2.*delta + cosTheta);
if ( (leftDenominator * rightDenominator) != 0. )
{
fCosTheta = oneOverMax * (1./(leftDenominator*leftDenominator) + beta/(rightDenominator*rightDenominator));
}
}
while (fCosTheta < G4UniformRand());
return cosTheta;
}
while (fCosTheta < G4UniformRand());
return cosTheta;
// ***** Alternative method using cumulative probability
/*
G4double cosTheta = -1;
G4double cumul = 0;
G4double value = 0;
G4double leftDenominator = 0.;
G4double rightDenominator = 0.;
// Number of integration steps in the -1,1 range
G4int iMax=200;
G4double random = G4UniformRand();
// Cumulate differential cross section
for (G4int i=0; i<iMax; i++)
if (fasterCode)
{
cosTheta = -1 + i*2./(iMax-1);
leftDenominator = (1. + 2.*gamma - cosTheta);
rightDenominator = (1. + 2.*delta + cosTheta);
G4double cosTheta = -1;
G4double cumul = 0;
G4double value = 0;
G4double leftDenominator = 0.;
G4double rightDenominator = 0.;
// Number of integration steps in the -1,1 range
G4int iMax=200;
G4double random = G4UniformRand();
// Cumulate differential cross section
for (G4int i=0; i<iMax; i++)
{
cosTheta = -1 + i*2./(iMax-1);
leftDenominator = (1. + 2.*gamma - cosTheta);
rightDenominator = (1. + 2.*delta + cosTheta);
if ( (leftDenominator * rightDenominator) != 0. )
{
cumul = cumul + (1./(leftDenominator*leftDenominator) + beta/(rightDenominator*rightDenominator));
}
}
}
// Select cosTheta
for (G4int i=0; i<iMax; i++)
{
cosTheta = -1 + i*2./(iMax-1);
leftDenominator = (1. + 2.*gamma - cosTheta);
rightDenominator = (1. + 2.*delta + cosTheta);
if (cumul !=0 && (leftDenominator * rightDenominator) != 0.)
// Select cosTheta
for (G4int i=0; i<iMax; i++)
{
cosTheta = -1 + i*2./(iMax-1);
leftDenominator = (1. + 2.*gamma - cosTheta);
rightDenominator = (1. + 2.*delta + cosTheta);
if (cumul !=0 && (leftDenominator * rightDenominator) != 0.)
value = value + (1./(leftDenominator*leftDenominator) + beta/(rightDenominator*rightDenominator)) / cumul;
if (random < value) break;
if (random < value) break;
}
return cosTheta;
}
return cosTheta;
*/
return 0.;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
@@ -473,25 +485,31 @@ G4double G4DNAScreenedRutherfordElasticModel::ScreenedRutherfordRandomizeCosThet
// ***** Original method
G4double n = ScreeningFactor(k, z);
G4double oneOverMax = (4. * n * n);
G4double cosTheta = 0.;
G4double fCosTheta;
do
if (!fasterCode)
{
cosTheta = 2. * G4UniformRand()- 1.;
fCosTheta = (1 + 2.*n - cosTheta);
if (fCosTheta !=0.) fCosTheta = oneOverMax / (fCosTheta*fCosTheta);
}
while (fCosTheta < G4UniformRand());
return cosTheta;
G4double n = ScreeningFactor(k, z);
G4double oneOverMax = (4. * n * n);
G4double cosTheta = 0.;
G4double fCosTheta;
do
{
cosTheta = 2. * G4UniformRand()- 1.;
fCosTheta = (1 + 2.*n - cosTheta);
if (fCosTheta !=0.) fCosTheta = oneOverMax / (fCosTheta*fCosTheta);
}
while (fCosTheta < G4UniformRand());
return cosTheta;
}
// ***** Alternative method using cumulative probability
/*
if (fasterCode)
{
G4double cosTheta = -1;
G4double cumul = 0;
G4double value = 0;
@@ -520,6 +538,8 @@ G4double G4DNAScreenedRutherfordElasticModel::ScreenedRutherfordRandomizeCosThet
if (random < value) break;
}
return cosTheta;
*/
}
return 0.;
}