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G4SauterGavrilaAngularDistribution.cc
Go to the documentation of this file.
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//
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// * Neither the authors of this software system, nor their employing *
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// ********************************************************************
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//
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// $Id: G4SauterGavrilaAngularDistribution.cc 91726 2015-08-03 15:41:36Z gcosmo $
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//
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// -------------------------------------------------------------------
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//
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// GEANT4 Class file
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//
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//
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// File name: G4SauterGavrilaAngularDistribution
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//
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// Author: Vladimir Ivanchenko using Michel Maire algorithm
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// developed for Geant3
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//
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// Creation date: 23 July 2012
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//
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//
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// -------------------------------------------------------------------
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//
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#include "
G4SauterGavrilaAngularDistribution.hh
"
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#include "
G4PhysicalConstants.hh
"
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#include "
Randomize.hh
"
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G4SauterGavrilaAngularDistribution::G4SauterGavrilaAngularDistribution
()
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:
G4VEmAngularDistribution
(
"AngularGenSauterGavrila"
)
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{}
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G4SauterGavrilaAngularDistribution::~G4SauterGavrilaAngularDistribution
()
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{}
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G4ThreeVector
&
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G4SauterGavrilaAngularDistribution::SampleDirection
(
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const
G4DynamicParticle
* dp,
G4double
,
G4int
,
const
G4Material
*)
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{
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G4double
tau = dp->
GetKineticEnergy
()/electron_mass_c2;
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static
const
G4double
taulimit = 50.0;
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if
(tau > taulimit) {
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fLocalDirection
= dp->
GetMomentumDirection
();
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// Bugzilla 1120
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// SI on 05/09/2010 as suggested by JG 04/09/10
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}
else
{
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// algorithm according Penelope 2008 manual and
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// F.Sauter Ann. Physik 9, 217(1931); 11, 454(1931).
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G4double
gamma = tau + 1;
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G4double
beta = std::sqrt(tau*(tau + 2))/gamma;
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G4double
A
= (1 - beta)/beta;
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G4double
Ap2 = A + 2;
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G4double
B
= 0.5*beta*gamma*(gamma - 1)*(gamma - 2);
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G4double
grej = 2*(1 + A*
B
)/A;
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G4double
z
,
g
;
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do
{
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G4double
q =
G4UniformRand
();
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z = 2*A*(2*q + Ap2*std::sqrt(q))/(Ap2*Ap2 - 4*q);
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g = (2 -
z
)*(1.0/(A + z) +
B
);
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// Loop checking, 03-Aug-2015, Vladimir Ivanchenko
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}
while
(g <
G4UniformRand
()*grej);
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G4double
cost = 1 -
z
;
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G4double
sint = std::sqrt(z*(2 - z));
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G4double
phi =
CLHEP::twopi
*
G4UniformRand
();
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fLocalDirection
.set(sint*std::cos(phi), sint*std::sin(phi), cost);
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fLocalDirection
.rotateUz(dp->
GetMomentumDirection
());
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}
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return
fLocalDirection
;
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}
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void
G4SauterGavrilaAngularDistribution::PrintGeneratorInformation
()
const
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{
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G4cout
<<
"\n"
<<
G4endl
;
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G4cout
<<
"Non-polarized photoelectric effect angular generator."
<<
G4endl
;
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G4cout
<<
"The Sauter-Gavrila distribution for the K-shell is used."
<<
G4endl
;
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G4cout
<<
"Originally developed by M.Maire for Geant3"
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<<
G4endl
;
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}
G4DynamicParticle::GetKineticEnergy
G4double GetKineticEnergy() const
G4ThreeVector
CLHEP::Hep3Vector G4ThreeVector
Definition:
G4ThreeVector.hh:42
z
G4double z
Definition:
TRTMaterials.hh:39
G4Material
Definition:
G4Material.hh:120
G4DynamicParticle
Definition:
G4DynamicParticle.hh:73
G4SauterGavrilaAngularDistribution::~G4SauterGavrilaAngularDistribution
virtual ~G4SauterGavrilaAngularDistribution()
Definition:
G4SauterGavrilaAngularDistribution.cc:52
G4SauterGavrilaAngularDistribution::SampleDirection
virtual G4ThreeVector & SampleDirection(const G4DynamicParticle *dp, G4double e=0.0, G4int shellId=0, const G4Material *mat=0)
Definition:
G4SauterGavrilaAngularDistribution.cc:56
B
double B(double temperature)
Definition:
G4DNAElectronHoleRecombination.cc:68
G4int
int G4int
Definition:
G4Types.hh:78
G4SauterGavrilaAngularDistribution::PrintGeneratorInformation
void PrintGeneratorInformation() const
Definition:
G4SauterGavrilaAngularDistribution.cc:95
G4SauterGavrilaAngularDistribution.hh
G4UniformRand
#define G4UniformRand()
Definition:
Randomize.hh:97
G4cout
G4GLOB_DLL std::ostream G4cout
A
double A(double temperature)
Definition:
G4DNAElectronHoleRecombination.cc:59
G4DynamicParticle::GetMomentumDirection
const G4ThreeVector & GetMomentumDirection() const
twopi
static const double twopi
Definition:
G4SIunits.hh:75
Randomize.hh
G4PhysicalConstants.hh
G4SauterGavrilaAngularDistribution::G4SauterGavrilaAngularDistribution
G4SauterGavrilaAngularDistribution()
Definition:
G4SauterGavrilaAngularDistribution.cc:48
g
static const double g
Definition:
G4SIunits.hh:180
G4VEmAngularDistribution
Definition:
G4VEmAngularDistribution.hh:60
G4endl
#define G4endl
Definition:
G4ios.hh:61
G4VEmAngularDistribution::fLocalDirection
G4ThreeVector fLocalDirection
Definition:
G4VEmAngularDistribution.hh:90
G4double
double G4double
Definition:
G4Types.hh:76
geant4.10.02.p02
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processes
electromagnetic
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G4SauterGavrilaAngularDistribution.cc
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