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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/standard/src/G4KleinNishinaModel.cc
+89 -70
View File
@@ -23,7 +23,7 @@
// * acceptance of all terms of the Geant4 Software license. *
// ********************************************************************
//
// $Id: G4KleinNishinaModel.cc 82754 2014-07-08 14:06:13Z gcosmo $
// $Id: G4KleinNishinaModel.cc 93362 2015-10-19 13:45:19Z gcosmo $
//
// -------------------------------------------------------------------
//
@@ -75,7 +75,10 @@ static const G4double dT0 = keV;
static const G4int nlooplim = 1000;
G4KleinNishinaModel::G4KleinNishinaModel(const G4String& nam)
: G4VEmModel(nam)
: G4VEmModel(nam),
lv1(0.,0.,0.,0.),
lv2(0.,0.,0.,0.),
bst(0.,0.,0.)
{
theGamma = G4Gamma::Gamma();
theElectron = G4Electron::Electron();
@@ -83,8 +86,8 @@ G4KleinNishinaModel::G4KleinNishinaModel(const G4String& nam)
limitFactor = 4;
fProbabilities.resize(9,0.0);
SetDeexcitationFlag(true);
fParticleChange = 0;
fAtomDeexcitation = 0;
fParticleChange = nullptr;
fAtomDeexcitation = nullptr;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
@@ -95,17 +98,19 @@ G4KleinNishinaModel::~G4KleinNishinaModel()
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
void G4KleinNishinaModel::Initialise(const G4ParticleDefinition* p,
const G4DataVector& cuts)
const G4DataVector& cuts)
{
fAtomDeexcitation = G4LossTableManager::Instance()->AtomDeexcitation();
if(IsMaster()) { InitialiseElementSelectors(p, cuts); }
if(!fParticleChange) { fParticleChange = GetParticleChangeForGamma(); }
if(nullptr == fParticleChange) {
fParticleChange = GetParticleChangeForGamma();
}
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
void G4KleinNishinaModel::InitialiseLocal(const G4ParticleDefinition*,
G4VEmModel* masterModel)
G4VEmModel* masterModel)
{
SetElementSelectors(masterModel->GetElementSelectors());
}
@@ -114,9 +119,9 @@ void G4KleinNishinaModel::InitialiseLocal(const G4ParticleDefinition*,
G4double
G4KleinNishinaModel::ComputeCrossSectionPerAtom(const G4ParticleDefinition*,
G4double gammaEnergy,
G4double Z, G4double,
G4double, G4double)
G4double gammaEnergy,
G4double Z, G4double,
G4double, G4double)
{
G4double xSection = 0.0 ;
if (gammaEnergy <= LowEnergyLimit()) { return xSection; }
@@ -132,7 +137,7 @@ G4KleinNishinaModel::ComputeCrossSectionPerAtom(const G4ParticleDefinition*,
G4double X = max(gammaEnergy, T0) / electron_mass_c2;
xSection = p1Z*G4Log(1.+2.*X)/X
+ (p2Z + p3Z*X + p4Z*X*X)/(1. + a*X + b*X*X + c*X*X*X);
// modification for low energy. (special case for Hydrogen)
if (gammaEnergy < T0) {
X = (T0+dT0) / electron_mass_c2 ;
@@ -154,11 +159,11 @@ G4KleinNishinaModel::ComputeCrossSectionPerAtom(const G4ParticleDefinition*,
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
void G4KleinNishinaModel::SampleSecondaries(
std::vector<G4DynamicParticle*>* fvect,
const G4MaterialCutsCouple* couple,
const G4DynamicParticle* aDynamicGamma,
G4double,
G4double)
std::vector<G4DynamicParticle*>* fvect,
const G4MaterialCutsCouple* couple,
const G4DynamicParticle* aDynamicGamma,
G4double,
G4double)
{
// primary gamma
G4double energy = aDynamicGamma->GetKineticEnergy();
@@ -189,35 +194,38 @@ void G4KleinNishinaModel::SampleSecondaries(
G4double bindingEnergy, ePotEnergy, eKinEnergy;
G4double gamEnergy0, gamEnergy1;
//static const G4double eminus2 = 1.0 - G4Exp(-2.0);
CLHEP::HepRandomEngine* rndmEngineMod = G4Random::getTheEngine();
G4double rndm[4];
do {
++nloop;
G4double xprob = totprob*rndmEngineMod->flat();
// 4 random numbers to select e-
rndmEngineMod->flatArray(4, rndm);
G4double xprob = totprob*rndm[0];
// select shell
for(i=0; i<nShells; ++i) { if(xprob <= fProbabilities[i]) { break; } }
bindingEnergy = elm->GetAtomicShell(i);
lv1.set(0.0,0.0,energy,energy);
//G4cout << "nShells= " << nShells << " i= " << i
// << " Egamma= " << energy << " Ebind= " << bindingEnergy
// << " Elim= " << limitEnergy
// << G4endl;
/*
G4cout << "nShells= " << nShells << " i= " << i
<< " Egamma= " << energy << " Ebind= " << bindingEnergy
<< G4endl;
*/
// for rest frame of the electron
G4double x = -G4Log(rndmEngineMod->flat());
G4double x = -G4Log(rndm[1]);
eKinEnergy = bindingEnergy*x;
ePotEnergy = bindingEnergy*(1.0 + x);
// for rest frame of the electron
G4double eTotMomentum = sqrt(eKinEnergy*(eKinEnergy + 2*electron_mass_c2));
G4double phi = rndmEngineMod->flat()*twopi;
G4double costet = 2*rndmEngineMod->flat() - 1;
G4double phi = rndm[2]*twopi;
G4double costet = 2*rndm[3] - 1;
G4double sintet = sqrt((1 - costet)*(1 + costet));
lv2.set(eTotMomentum*sintet*cos(phi),eTotMomentum*sintet*sin(phi),
eTotMomentum*costet,eKinEnergy + electron_mass_c2);
eTotMomentum*costet,eKinEnergy + electron_mass_c2);
bst = lv2.boostVector();
lv1.boost(-bst);
@@ -229,6 +237,7 @@ void G4KleinNishinaModel::SampleSecondaries(
// (Nuc Phys 20(1960),15).
G4double E0_m = gamEnergy0/electron_mass_c2;
//G4cout << "Nloop= "<< nloop << " Ecm(keV)= " << gamEnergy0/keV << G4endl;
//
// sample the energy rate of the scattered gamma
//
@@ -238,27 +247,31 @@ void G4KleinNishinaModel::SampleSecondaries(
G4double eps0 = 1./(1 + 2*E0_m);
G4double epsilon0sq = eps0*eps0;
G4double alpha1 = - G4Log(eps0);
G4double alpha2 = 0.5*(1 - epsilon0sq);
G4double alpha2 = alpha1 + 0.5*(1 - epsilon0sq);
do {
++nloop;
// false interaction if too many iterations
if(nloop > nlooplim) { return; }
if ( alpha1/(alpha1+alpha2) > rndmEngineMod->flat() ) {
epsilon = G4Exp(-alpha1*rndmEngineMod->flat()); // epsilon0**r
epsilonsq = epsilon*epsilon;
// 3 random numbers to sample scattering
rndmEngineMod->flatArray(3, rndm);
if ( alpha1 > alpha2*rndm[0] ) {
epsilon = G4Exp(-alpha1*rndm[1]); // epsilon0**r
epsilonsq = epsilon*epsilon;
} else {
epsilonsq = epsilon0sq + (1.- epsilon0sq)*rndmEngineMod->flat();
epsilon = sqrt(epsilonsq);
epsilonsq = epsilon0sq + (1.- epsilon0sq)*rndm[1];
epsilon = sqrt(epsilonsq);
}
onecost = (1.- epsilon)/(epsilon*E0_m);
sint2 = onecost*(2.-onecost);
greject = 1. - epsilon*sint2/(1.+ epsilonsq);
} while (greject < rndmEngineMod->flat());
// Loop checking, 03-Aug-2015, Vladimir Ivanchenko
} while (greject < rndm[2]);
gamEnergy1 = epsilon*gamEnergy0;
// before scattering total 4-momentum in e- system
@@ -281,11 +294,13 @@ void G4KleinNishinaModel::SampleSecondaries(
v.rotateUz(gamDir);
lv1.set(gamEnergy1*v.x(),gamEnergy1*v.y(),gamEnergy1*v.z(),gamEnergy1);
lv2 -= lv1;
//G4cout<<"Egam= "<<lv1.e()<<" Ee= "<< lv2.e()-electron_mass_c2 << G4endl;
//G4cout<<"Egam(keV)= " << lv1.e()/keV
// <<" Ee(keV)= " << (lv2.e()-electron_mass_c2)/keV << G4endl;
lv2.boost(bst);
eKinEnergy = lv2.e() - electron_mass_c2 - ePotEnergy;
//G4cout << "eKinEnergy= " << eKinEnergy << G4endl;
//G4cout << "Nloop= " << nloop << " eKinEnergy= " << eKinEnergy << G4endl;
// Loop checking, 03-Aug-2015, Vladimir Ivanchenko
} while ( eKinEnergy < 0.0 );
//
@@ -327,46 +342,50 @@ void G4KleinNishinaModel::SampleSecondaries(
G4int Z = G4lrint(elm->GetZ());
G4AtomicShellEnumerator as = G4AtomicShellEnumerator(i);
const G4AtomicShell* shell = fAtomDeexcitation->GetAtomicShell(Z, as);
size_t nbefore = fvect->size();
G4int nbefore = fvect->size();
fAtomDeexcitation->GenerateParticles(fvect, shell, Z, index);
size_t nafter = fvect->size();
if(nafter > nbefore) {
for (size_t j=nbefore; j<nafter; ++j) {
G4double e = ((*fvect)[j])->GetKineticEnergy();
if(esec + e > edep) {
/*
G4cout << "### G4KleinNishinaModel Edep(eV)= " << edep/eV
<< " Esec(eV)= " << esec/eV
<< " E["<< j << "](eV)= " << e/eV
<< " N= " << nafter
<< " Z= " << Z << " shell= " << i
<< " Ebind(keV)= " << bindingEnergy/keV
<< " Eshell(keV)= " << shell->BindingEnergy()/keV
<< G4endl;
*/
for (size_t jj=nafter-1; jj>=j; --jj) {
delete (*fvect)[jj];
fvect->pop_back();
}
break;
}
esec += e;
}
G4int nafter = fvect->size();
//G4cout << "N1= " << nbefore << " N2= " << nafter << G4endl;
for (G4int j=nbefore; j<nafter; ++j) {
G4double e = ((*fvect)[j])->GetKineticEnergy();
if(esec + e > edep) {
// correct energy in order to have energy balance
e = edep - esec;
((*fvect)[j])->SetKineticEnergy(e);
esec += e;
/*
G4cout << "### G4KleinNishinaModel Edep(eV)= " << edep/eV
<< " Esec(eV)= " << esec/eV
<< " E["<< j << "](eV)= " << e/eV
<< " N= " << nafter
<< " Z= " << Z << " shell= " << i
<< " Ebind(keV)= " << bindingEnergy/keV
<< " Eshell(keV)= " << shell->BindingEnergy()/keV
<< G4endl;
*/
// delete the rest of secondaries (should not happens)
for (G4int jj=nafter-1; jj>j; --jj) {
delete (*fvect)[jj];
fvect->pop_back();
}
break;
}
esec += e;
}
edep -= esec;
}
}
if(fabs(energy - gamEnergy1 - eKinEnergy - esec - edep) > eV) {
G4cout << "### G4KleinNishinaModel dE(eV)= "
<< (energy - gamEnergy1 - eKinEnergy - esec - edep)/eV
<< " shell= " << i
<< " E(keV)= " << energy/keV
<< " Ebind(keV)= " << bindingEnergy/keV
<< " Eg(keV)= " << gamEnergy1/keV
<< " Ee(keV)= " << eKinEnergy/keV
<< " Esec(keV)= " << esec/keV
<< " Edep(keV)= " << edep/keV
<< G4endl;
<< (energy - gamEnergy1 - eKinEnergy - esec - edep)/eV
<< " shell= " << i
<< " E(keV)= " << energy/keV
<< " Ebind(keV)= " << bindingEnergy/keV
<< " Eg(keV)= " << gamEnergy1/keV
<< " Ee(keV)= " << eKinEnergy/keV
<< " Esec(keV)= " << esec/keV
<< " Edep(keV)= " << edep/keV
<< G4endl;
}
// energy balance
if(edep > 0.0) {