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This commit is contained in:
Gabriele Cosmo
2016-06-09 10:15:15 +02:00
parent 37fff30d2e
commit fbd4999cf7
4396 changed files with 56662 additions and 52446 deletions
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source/processes/electromagnetic/standard/src/G4eBremsstrahlungModel.cc
+123 -99
View File
@@ -29,17 +29,21 @@
// File name: G4eBremsstrahlungModel
//
// Author: Vladimir Ivanchenko on base of Laszlo Urban code
//
//
// Creation date: 03.01.2002
//
// Modifications:
// Modifications:
//
// 11-11-02 Fix division by 0 (VI)
// 04-12-02 Change G4DynamicParticle constructor in PostStep (VI)
// 11-11-02 Fix division by 0 (V.Ivanchenko)
// 04-12-02 Change G4DynamicParticle constructor in PostStep (V.Ivanchenko)
// 23-12-02 Change interface in order to move to cut per region (V.Ivanchenko)
// 24-01-03 Fix for compounds (V.Ivanchenko)
// 27-01-03 Make models region aware (V.Ivanchenko)
// 13-02-03 Add name (V.Ivanchenko)
//
// Class Description:
//
// Class Description:
//
//
// -------------------------------------------------------------------
//
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
@@ -53,11 +57,14 @@
#include "G4Material.hh"
#include "G4Element.hh"
#include "G4ElementVector.hh"
#include "G4ProductionCutsTable.hh"
#include "G4DataVector.hh"
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
G4eBremsstrahlungModel::G4eBremsstrahlungModel(const G4ParticleDefinition* p)
: G4VEmModel(),
G4eBremsstrahlungModel::G4eBremsstrahlungModel(const G4ParticleDefinition* p,
const G4String& nam)
: G4VEmModel(nam),
particle(0),
highKinEnergy(100.*TeV),
lowKinEnergy(1.0*keV),
@@ -66,16 +73,14 @@ G4eBremsstrahlungModel::G4eBremsstrahlungModel(const G4ParticleDefinition* p)
MigdalConstant(classic_electr_radius*electron_Compton_length*electron_Compton_length/pi),
LPMconstant(fine_structure_const*electron_mass_c2*electron_mass_c2/(8.*pi*hbarc)),
isElectron(true),
theLPMflag(true),
oldMaterial(0)
theLPMflag(true)
{
if(p) SetParticle(p);
partialSumSigma.clear();
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
G4eBremsstrahlungModel::~G4eBremsstrahlungModel()
G4eBremsstrahlungModel::~G4eBremsstrahlungModel()
{
size_t n = partialSumSigma.size();
if(n > 0) {
@@ -87,7 +92,7 @@ G4eBremsstrahlungModel::~G4eBremsstrahlungModel()
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
void G4eBremsstrahlungModel::SetParticle(const G4ParticleDefinition* p)
void G4eBremsstrahlungModel::SetParticle(const G4ParticleDefinition* p)
{
particle = p;
if(p == G4Electron::Electron()) isElectron = true;
@@ -96,42 +101,64 @@ void G4eBremsstrahlungModel::SetParticle(const G4ParticleDefinition* p)
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
G4double G4eBremsstrahlungModel::HighEnergyLimit(const G4ParticleDefinition* p,
const G4Material*)
G4double G4eBremsstrahlungModel::HighEnergyLimit(const G4ParticleDefinition*)
{
return highKinEnergy;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
G4double G4eBremsstrahlungModel::LowEnergyLimit(const G4ParticleDefinition* p,
const G4Material*)
G4double G4eBremsstrahlungModel::LowEnergyLimit(const G4ParticleDefinition*)
{
return lowKinEnergy;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
G4double G4eBremsstrahlungModel::MinEnergyCut(const G4ParticleDefinition* p,
const G4Material*)
G4double G4eBremsstrahlungModel::MinEnergyCut(const G4ParticleDefinition*,
const G4MaterialCutsCouple*)
{
return minThreshold;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
G4bool G4eBremsstrahlungModel::IsInCharge(const G4ParticleDefinition* p,
const G4Material*)
G4bool G4eBremsstrahlungModel::IsInCharge(const G4ParticleDefinition* p)
{
return (p == G4Electron::Electron() || p == G4Positron::Positron());
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
void G4eBremsstrahlungModel::Initialise(const G4ParticleDefinition* p,
const G4DataVector& cuts)
{
if(p) SetParticle(p);
const G4ProductionCutsTable* theCoupleTable=
G4ProductionCutsTable::GetProductionCutsTable();
size_t numOfCouples = theCoupleTable->GetTableSize();
for (size_t ii=0; ii<partialSumSigma.size(); ii++){
G4DataVector* a=partialSumSigma[ii];
if ( a ) delete a;
}
partialSumSigma.clear();
for (size_t i=0; i<numOfCouples; i++) {
const G4MaterialCutsCouple* couple = theCoupleTable->GetMaterialCutsCouple(i);
const G4Material* material = couple->GetMaterial();
G4DataVector* dv = ComputePartialSumSigma(material, 0.5*highKinEnergy,
G4std::min(cuts[i], 0.25*highKinEnergy));
partialSumSigma.push_back(dv);
}
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
G4double G4eBremsstrahlungModel::ComputeDEDX(const G4Material* material,
const G4ParticleDefinition* p,
G4double kineticEnergy,
G4double cutEnergy)
G4double cutEnergy)
{
if(!particle) SetParticle(p);
if(kineticEnergy < lowKinEnergy) return 0.0;
@@ -145,7 +172,7 @@ G4double G4eBremsstrahlungModel::ComputeDEDX(const G4Material* material,
const G4double factorHigh = 36./(1450.*GeV);
const G4double coef1 = -0.5;
const G4double coef2 = 2./9.;
const G4ElementVector* theElementVector = material->GetElementVector();
const G4double* theAtomicNumDensityVector = material->GetAtomicNumDensityVector();
@@ -163,22 +190,22 @@ G4double G4eBremsstrahlungModel::ComputeDEDX(const G4Material* material,
x = log(totalEnergy/electron_mass_c2);
loss = ComputeBremLoss(Z, kineticEnergy, cut, x) ;
if (!isElectron) loss *= PositronCorrFactorLoss(Z, kineticEnergy, cut);
if (!isElectron) loss *= PositronCorrFactorLoss(Z, kineticEnergy, cut);
// extrapolation for KineticEnergy>100 GeV
} else if(cut < thigh) {
loss = ComputeBremLoss(Z, thigh, cut, xhigh) ;
if (!isElectron) loss *= PositronCorrFactorLoss(Z, thigh, cut) ;
if (!isElectron) loss *= PositronCorrFactorLoss(Z, thigh, cut) ;
rate = cut/kineticEnergy;
loss *= (1. + coef1*rate + coef2*rate*rate);
rate = cut/thigh;
loss /= (1.+coef1*rate+coef2*rate*rate);
} else {
loss = ComputeBremLoss(Z, thigh, 0.5*thigh, xhigh) ;
if (!isElectron) loss *= PositronCorrFactorLoss(Z, thigh, 0.5*thigh) ;
if (!isElectron) loss *= PositronCorrFactorLoss(Z, thigh, 0.5*thigh) ;
rate = cut/kineticEnergy;
loss *= (1. + coef1*rate + coef2*rate*rate);
loss *= cut*factorHigh;
@@ -196,7 +223,7 @@ G4double G4eBremsstrahlungModel::ComputeDEDX(const G4Material* material,
G4double floss = 0.;
G4int nmax = 100;
G4double vmin=log(kmin);
G4double vmax=log(kmax) ;
G4int nn = (G4int)(nmax*(vmax-vmin)/(log(highKinEnergy)-vmin)) ;
@@ -208,8 +235,8 @@ G4double G4eBremsstrahlungModel::ComputeDEDX(const G4Material* material,
for(G4int n=0; n<=nn; n++) {
v += dv;
u = exp(v);
v += dv;
u = exp(v);
fac = u*SupressionFunction(material,kineticEnergy,u);
fac *= probsup*(u*u/(u*u+kp2))+1.-probsup;
if ((n==0)||(n==nn)) c=0.5;
@@ -217,7 +244,7 @@ G4double G4eBremsstrahlungModel::ComputeDEDX(const G4Material* material,
fac *= c ;
floss += fac ;
}
floss *=dv/(kmax-kmin);
floss *=dv/(kmax-kmin);
} else {
floss = 1.;
@@ -237,7 +264,7 @@ G4double G4eBremsstrahlungModel::ComputeDEDX(const G4Material* material,
G4double G4eBremsstrahlungModel::ComputeBremLoss(G4double Z, G4double T,
G4double Cut, G4double x)
// compute loss due to soft brems
// compute loss due to soft brems
{
static const G4double beta=1.0, ksi=2.0;
static const G4double clossh = 0.254 , closslow = 1./3. , alosslow = 1. ;
@@ -298,7 +325,7 @@ G4double G4eBremsstrahlungModel::ComputeBremLoss(G4double Z, G4double T,
for (G4int ii=0; ii<NZ; ii++)
{
G4double dz = abs(Z-ZZ[ii]);
if(dz < delz) {
if(dz < delz) {
iz = ii;
delz = dz;
}
@@ -306,7 +333,7 @@ G4double G4eBremsstrahlungModel::ComputeBremLoss(G4double Z, G4double T,
G4double xx = log10(T);
G4double fl = 1.;
if (xx <= xlim)
{
fl = coefloss[iz][Nloss-1];
@@ -321,10 +348,10 @@ G4double G4eBremsstrahlungModel::ComputeBremLoss(G4double Z, G4double T,
if (T <= Tlim) loss /= exp(closslow*log(Tlim/T));
if( T <= Cut) loss *= exp(alosslow*log(T/Cut));
// correction
// correction
loss *= (aaa+bbb*T/Tlim)/(1.+ccc*T/Tlim);
loss *= fl;
loss /= Avogadro;
loss /= Avogadro;
return loss;
}
@@ -335,7 +362,7 @@ G4double G4eBremsstrahlungModel::PositronCorrFactorLoss(G4double Z,
G4double kineticEnergy, G4double cut)
//calculates the correction factor for the energy loss due to bremsstrahlung for positrons
//the same correction is in the (discrete) bremsstrahlung
//the same correction is in the (discrete) bremsstrahlung
{
static const G4double K = 132.9416*eV ;
@@ -344,24 +371,24 @@ G4double G4eBremsstrahlungModel::PositronCorrFactorLoss(G4double Z,
G4double x = log(kineticEnergy/(K*Z*Z)), x2 = x*x, x3 = x2*x;
G4double eta = 0.5+atan(a1*x+a3*x3+a5*x3*x2)/pi;
G4double e0 = cut/kineticEnergy;
G4double factor = 0.0;
if (e0 < 1.0) {
factor=log(1.-e0)/eta;
if (e0 < 1.0) {
factor=log(1.-e0)/eta;
factor=exp(factor);
}
}
factor = eta*(1.-factor)/e0;
return factor;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
G4double G4eBremsstrahlungModel::CrossSection(const G4Material* material,
const G4ParticleDefinition* p,
G4double kineticEnergy,
G4double cutEnergy,
G4double maxEnergy)
G4double maxEnergy)
{
if(!particle) SetParticle(p);
G4double cross = 0.0;
@@ -372,22 +399,16 @@ G4double G4eBremsstrahlungModel::CrossSection(const G4Material* material,
const G4ElementVector* theElementVector = material->GetElementVector() ;
const G4double* theAtomNumDensityVector = material->GetAtomicNumDensityVector();
if(material != oldMaterial) {
oldMaterial = material;
ComputePartialSumSigma(material, 0.5*highKinEnergy,
G4std::min(cutEnergy, 0.25*highKinEnergy));
}
for (size_t i=0; i<material->GetNumberOfElements(); i++) {
cross += theAtomNumDensityVector[i] * CrossSectionPerAtom(kineticEnergy,
(*theElementVector)[i]->GetZ(), cut);
if(tmax < kineticEnergy) {
cross -= theAtomNumDensityVector[i] * CrossSectionPerAtom(kineticEnergy,
(*theElementVector)[i]->GetZ(), tmax);
}
}
}
// now compute the correction due to the supression(s)
G4double kmax = tmax;
@@ -432,7 +453,7 @@ G4double G4eBremsstrahlungModel::CrossSection(const G4Material* material,
// correct the cross section
cross *= fsig;
return cross;
}
@@ -513,7 +534,7 @@ G4double G4eBremsstrahlungModel::CrossSectionPerAtom(G4double kineticEnergy,
G4double xx = log10(kineticEnergy) ;
G4double fs = 1. ;
if (xx <= xlim) {
fs = coefsig[iz][Nsig-1] ;
@@ -542,12 +563,12 @@ G4double G4eBremsstrahlungModel::CrossSectionPerAtom(G4double kineticEnergy,
G4double G4eBremsstrahlungModel::PositronCorrFactorSigma( G4double Z,
G4double kineticEnergy, G4double cut)
//Calculates the correction factor for the total cross section of the positron bremsstrahl.
// Eta is the ratio of positron to electron energy loss by bremstrahlung.
// A parametrized formula from L. Urban is used to estimate eta. It is a fit to the results
// of L. Kim & al: Phys Rev. A33,3002 (1986)
{
static const G4double K = 132.9416*eV;
static const G4double a1 = 4.15e-1, a3 = 2.10e-3, a5 = 54.0e-5;
@@ -562,58 +583,48 @@ G4double G4eBremsstrahlungModel::PositronCorrFactorSigma( G4double Z,
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
void G4eBremsstrahlungModel::ComputePartialSumSigma(const G4Material* material,
G4double kineticEnergy,
G4double cut)
G4DataVector* G4eBremsstrahlungModel::ComputePartialSumSigma(
const G4Material* material,
G4double kineticEnergy,
G4double cut)
// Build the table of cross section per element. The table is built for MATERIALS.
// This table is used by DoIt to select randomly an element in the material.
// This table is used by DoIt to select randomly an element in the material.
{
size_t index = material->GetIndex();
G4int nElements = material->GetNumberOfElements();
const G4ElementVector* theElementVector = material->GetElementVector();
const G4ElementVector* theElementVector = material->GetElementVector();
const G4double* theAtomNumDensityVector = material->GetAtomicNumDensityVector();
G4DataVector* dv;
if (index >= partialSumSigma.size()) {
dv = new G4DataVector();
partialSumSigma.push_back(dv);
} else {
dv = partialSumSigma[index];
dv->clear();
}
G4DataVector* dv = new G4DataVector();
G4double cross = 0.0;
for (G4int i=0; i<nElements; i++ ) {
cross += theAtomNumDensityVector[i] * CrossSectionPerAtom(kineticEnergy,
(*theElementVector)[i]->GetZ(), cut);
dv->push_back(cross);
}
return dv;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
G4std::vector<G4DynamicParticle*>* G4eBremsstrahlungModel::SampleSecondary(
const G4Material* material,
G4DynamicParticle* G4eBremsstrahlungModel::SampleSecondary(
const G4MaterialCutsCouple* couple,
const G4DynamicParticle* dp,
G4double tmin,
G4double maxEnergy)
G4double maxEnergy)
// The emitted gamma energy is sampled using a parametrized formula from L. Urban.
// This parametrization is derived from :
// cross-section values of Seltzer and Berger for electron energies 1 keV - 10 GeV,
// screened Bethe Heilter differential cross section above 10 GeV,
// Migdal corrections in both case.
// Migdal corrections in both case.
// Seltzer & Berger: Nim B 12:95 (1985)
// Nelson, Hirayama & Rogers: Technical report 265 SLAC (1985)
// Migdal: Phys Rev 103:1811 (1956); Messel & Crawford: Pergamon Press (1970)
//
// A modified version of the random number techniques of Butcher & Messel is used
//
// A modified version of the random number techniques of Butcher & Messel is used
// (Nuc Phys 20(1960),15).
{
G4double kineticEnergy = dp->GetKineticEnergy();
@@ -622,7 +633,7 @@ G4std::vector<G4DynamicParticle*>* G4eBremsstrahlungModel::SampleSecondary(
//
// GEANT4 internal units.
//
//
static const G4double
ah10 = 4.67733E+00, ah11 =-6.19012E-01, ah12 = 2.02225E-02,
ah20 =-7.34101E+00, ah21 = 1.00462E+00, ah22 =-3.20985E-02,
@@ -645,9 +656,10 @@ G4std::vector<G4DynamicParticle*>* G4eBremsstrahlungModel::SampleSecondary(
G4double gammaEnergy;
G4bool LPMOK = false;
const G4Material* material = couple->GetMaterial();
// select randomly one element constituing the material
const G4Element* anElement = SelectRandomAtom(material);
// select randomly one element constituing the material
const G4Element* anElement = SelectRandomAtom(couple);
// Extract Z factors for this Element
G4double lnZ = 3.*(anElement->GetIonisation()->GetlogZ3());
@@ -676,7 +688,7 @@ G4std::vector<G4DynamicParticle*>* G4eBremsstrahlungModel::SampleSecondary(
//
do {
if (kineticEnergy > 1.*MeV)
if (kineticEnergy > 1.*MeV)
{
// parameters
G4double ah1 = ah10 + ZZ* (ah11 + ZZ* ah12),
@@ -700,12 +712,12 @@ G4std::vector<G4DynamicParticle*>* G4eBremsstrahlungModel::SampleSecondary(
G4double F2 = G4std::max(ScreenFunction2(screenmin) - FZ ,0.);
grejmax = (F1 - epsilmin* (F1*ah - bh*epsilmin*F2))/(42.392 - FZ);
// sample the energy rate of the emitted Gamma
// sample the energy rate of the emitted Gamma
G4double screenvar;
do {
q = G4UniformRand();
x = pow(xmin, q + kappa*(1.0 - q));
x = pow(xmin, q + kappa*(1.0 - q));
epsil = x*kineticEnergy/totalEnergy;
screenvar = screenfac*epsil/(1-epsil);
F1 = G4std::max(ScreenFunction1(screenvar) - FZ ,0.);
@@ -740,9 +752,9 @@ G4std::vector<G4DynamicParticle*>* G4eBremsstrahlungModel::SampleSecondary(
// sample the energy rate of the emitted Gamma
do {
do {
q = G4UniformRand();
x = pow(xmin, q + kappa*(1.0 - q));
x = pow(xmin, q + kappa*(1.0 - q));
migdal = (1. + MigdalFactor)/(1. + MigdalFactor/(x*x));
greject = migdal*(1. + x* (al + bl*x));
} while( greject < G4UniformRand()*grejmax );
@@ -779,20 +791,31 @@ G4std::vector<G4DynamicParticle*>* G4eBremsstrahlungModel::SampleSecondary(
G4double theta = u*electron_mass_c2/totalEnergy;
G4double sint = sin(theta);
G4double phi = twopi * G4UniformRand() ;
G4double phi = twopi * G4UniformRand() ;
G4ThreeVector gammaDirection(sint*cos(phi),sint*sin(phi), cos(theta));
gammaDirection.rotateUz(momentum);
// create G4DynamicParticle object for the Gamma
// create G4DynamicParticle object for the Gamma
G4DynamicParticle* g = new G4DynamicParticle();
g->SetDefinition(G4Gamma::Gamma());
g->SetKineticEnergy(gammaEnergy);
g->SetMomentumDirection(gammaDirection);
return g;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
G4std::vector<G4DynamicParticle*>* G4eBremsstrahlungModel::SampleSecondaries(
const G4MaterialCutsCouple* couple,
const G4DynamicParticle* dp,
G4double tmin,
G4double maxEnergy)
{
G4std::vector<G4DynamicParticle*>* vdp = new G4std::vector<G4DynamicParticle*>;
G4DynamicParticle* g = SampleSecondary(couple,dp,tmin,maxEnergy);
vdp->push_back(g);
return vdp;
@@ -801,16 +824,17 @@ G4std::vector<G4DynamicParticle*>* G4eBremsstrahlungModel::SampleSecondary(
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
const G4Element* G4eBremsstrahlungModel::SelectRandomAtom(
const G4Material* material) const
const G4MaterialCutsCouple* couple) const
{
// select randomly 1 element within the material
const G4Material* material = couple->GetMaterial();
G4int nElements = material->GetNumberOfElements();
const G4ElementVector* theElementVector = material->GetElementVector();
if(1 == nElements) return (*theElementVector)[0];
else if(1 > nElements) return 0;
else if(1 > nElements) return 0;
G4DataVector* dv = partialSumSigma[material->GetIndex()];
G4DataVector* dv = partialSumSigma[couple->GetIndex()];
G4double rval = G4UniformRand()*((*dv)[nElements-1]);
for (G4int i=0; i<nElements; i++) {
if (rval <= (*dv)[i]) return (*theElementVector)[i];