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This commit is contained in:
Gabriele Cosmo
2023-06-19 17:17:14 +02:00
parent 84a556a9dc
commit aef78ca386
309 changed files with 35572 additions and 34678 deletions
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source/processes/electromagnetic/highenergy/src/G4GammaConversionToMuons.cc
+62 -42
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@@ -91,9 +91,17 @@ G4bool G4GammaConversionToMuons::IsApplicable(const G4ParticleDefinition& part)
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
void G4GammaConversionToMuons::BuildPhysicsTable(const G4ParticleDefinition& p)
// Build cross section and mean free path tables
{ //here no tables, just calling PrintInfoDefinition
{
Energy5DLimit = G4EmParameters::Instance()->MaxEnergyFor5DMuPair();
auto table = G4Material::GetMaterialTable();
std::size_t nelm = 0;
for(auto const & mat : *table) {
std::size_t n = mat->GetNumberOfElements();
nelm = std::max(nelm, n);
}
fTemp.resize(nelm, 0);
if(Energy5DLimit > 0.0 && nullptr != f5Dmodel) {
f5Dmodel = new G4BetheHeitler5DModel();
f5Dmodel->SetLeptonPair(theMuonPlus, theMuonMinus);
@@ -108,15 +116,12 @@ void G4GammaConversionToMuons::BuildPhysicsTable(const G4ParticleDefinition& p)
G4double G4GammaConversionToMuons::GetMeanFreePath(const G4Track& aTrack,
G4double, G4ForceCondition*)
// returns the photon mean free path in GEANT4 internal units
// (MeanFreePath is a private member of the class)
{
const G4DynamicParticle* aDynamicGamma = aTrack.GetDynamicParticle();
G4double GammaEnergy = aDynamicGamma->GetKineticEnergy();
const G4Material* aMaterial = aTrack.GetMaterial();
return ComputeMeanFreePath(GammaEnergy, aMaterial);
const G4DynamicParticle* aDynamicGamma = aTrack.GetDynamicParticle();
G4double GammaEnergy = aDynamicGamma->GetKineticEnergy();
const G4Material* aMaterial = aTrack.GetMaterial();
return ComputeMeanFreePath(GammaEnergy, aMaterial);
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
@@ -192,12 +197,11 @@ G4double G4GammaConversionToMuons::ComputeCrossSectionPerAtom(
sigfac=4.*fine_structure_const*Z*Z*Rc*Rc;
PowThres=1.479+0.00799*Dn;
Ecor=-18.+4347./(B*Zthird);
G4double CorFuc=1.+.04*G4Log(1.+Ecor/Egam);
//G4double Eg=pow(1.-4.*Mmuon/Egam,PowThres)*pow( pow(Wsatur,PowSat)+
// pow(Egam,PowSat),1./PowSat); // threshold and saturation
G4double Eg=G4Exp(G4Log(1.-4.*Mmuon/Egam)*PowThres)*
G4Exp(G4Log( G4Exp(G4Log(Wsatur)*PowSat)+G4Exp(G4Log(Egam)*PowSat))/PowSat);
G4Exp(G4Log(G4Exp(G4Log(Wsatur)*PowSat) + G4Exp(G4Log(Egam)*PowSat))/PowSat);
G4double CrossSection=7./9.*sigfac*G4Log(1.+WMedAppr*CorFuc*Eg);
CrossSection *= CrossSecFactor; // increase the CrossSection by (by default 1)
return CrossSection;
@@ -210,8 +214,10 @@ void G4GammaConversionToMuons::SetCrossSecFactor(G4double fac)
{
if(fac < 0.0) return;
CrossSecFactor=fac;
G4cout << "The cross section for GammaConversionToMuons is artificially "
<< "increased by the CrossSecFactor=" << CrossSecFactor << G4endl;
if (verboseLevel > 0) {
G4cout << "The cross section for GammaConversionToMuons is artificially "
<< "increased by the CrossSecFactor=" << CrossSecFactor << G4endl;
}
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.....
@@ -243,7 +249,6 @@ G4VParticleChange* G4GammaConversionToMuons::PostStepDoIt(
std::vector<G4DynamicParticle*> fvect;
f5Dmodel->SampleSecondaries(&fvect, aTrack.GetMaterialCutsCouple(),
aTrack.GetDynamicParticle(), 0.0, DBL_MAX);
aParticleChange.SetNumberOfSecondaries((G4int)fvect.size());
for(auto dp : fvect) { aParticleChange.AddSecondary(dp); }
return G4VDiscreteProcess::PostStepDoIt(aTrack,aStep);
}
@@ -276,33 +281,41 @@ G4VParticleChange* G4GammaConversionToMuons::PostStepDoIt(
G4double GammaMuonInv=Mmuon/Egam;
// generate xPlus according to the differential cross section by rejection
G4double xmin=(Egam < LimitEnergy) ? GammaMuonInv : .5-sqrt(.25-GammaMuonInv);
G4double xmin=(Egam <= LimitEnergy) ? 0.5 : 0.5 - std::sqrt(0.25 - GammaMuonInv);
G4double xmax=1.-xmin;
G4double Ds2=(Dn*sqrte-2.);
G4double sBZ=sqrte*B*Zthird/electron_mass_c2;
G4double LogWmaxInv=1./G4Log(Winfty*(1.+2.*Ds2*GammaMuonInv)
/(1.+2.*sBZ*Mmuon*GammaMuonInv));
G4double xPlus,xMinus,xPM,result,W;
G4double xPlus = 0.5;
G4double xMinus = 0.5;
G4double xPM = 0.25;
G4int nn = 0;
const G4int nmax = 1000;
do {
xPlus=xmin+G4UniformRand()*(xmax-xmin);
xMinus=1.-xPlus;
xPM=xPlus*xMinus;
G4double del=Mmuon*Mmuon/(2.*Egam*xPM);
W=Winfty*(1.+Ds2*del/Mmuon)/(1.+sBZ*del);
G4double xxp=1.-4./3.*xPM; // the main xPlus dependence
result=(xxp > 0.) ? xxp*G4Log(W)*LogWmaxInv : 0.0;
if(result>1.) {
G4cout << "G4GammaConversionToMuons::PostStepDoIt WARNING:"
<< " in dSigxPlusGen, result=" << result << " > 1" << G4endl;
// sampling for Egam > LimitEnergy
if (xmin < 0.5) {
G4double result,W;
do {
xPlus=xmin+G4UniformRand()*(xmax-xmin);
xMinus=1.-xPlus;
xPM=xPlus*xMinus;
G4double del=Mmuon*Mmuon/(2.*Egam*xPM);
W=Winfty*(1.+Ds2*del/Mmuon)/(1.+sBZ*del);
G4double xxp=1.-4./3.*xPM; // the main xPlus dependence
result=(xxp > 0.) ? xxp*G4Log(W)*LogWmaxInv : 0.0;
if(result>1.) {
G4cout << "G4GammaConversionToMuons::PostStepDoIt WARNING:"
<< " in dSigxPlusGen, result=" << result << " > 1" << G4endl;
}
++nn;
if(nn >= nmax) { break; }
}
++nn;
if(nn >= nmax) { break; }
// Loop checking, 07-Aug-2015, Vladimir Ivanchenko
while (G4UniformRand() > result);
}
// Loop checking, 07-Aug-2015, Vladimir Ivanchenko
while (G4UniformRand() > result);
// now generate the angular variables via the auxilary variables t,psi,rho
G4double t;
@@ -406,7 +419,7 @@ G4VParticleChange* G4GammaConversionToMuons::PostStepDoIt(
// rotate to actual gamma direction
MuPlusDirection.rotateUz(GammaDirection);
MuMinusDirection.rotateUz(GammaDirection);
aParticleChange.SetNumberOfSecondaries(2);
// create G4DynamicParticle object for the particle1
G4DynamicParticle* aParticle1 =
new G4DynamicParticle(theMuonPlus,MuPlusDirection,EPlus-Mmuon);
@@ -431,18 +444,24 @@ const G4Element* G4GammaConversionToMuons::SelectRandomAtom(
const G4ElementVector* theElementVector = aMaterial->GetElementVector();
const G4Element* elm = (*theElementVector)[0];
if (NumberOfElements > 1) {
const G4double* NbOfAtomsPerVolume = aMaterial->GetVecNbOfAtomsPerVolume();
G4double PartialSumSigma = 0.;
G4double rval = G4UniformRand()/MeanFreePath;
if (NumberOfElements > 1) {
G4double e = std::max(aDynamicGamma->GetKineticEnergy(), LimitEnergy);
const G4double* natom = aMaterial->GetVecNbOfAtomsPerVolume();
G4double sum = 0.;
for (std::size_t i=0; i<NumberOfElements; ++i)
{
elm = (*theElementVector)[i];
PartialSumSigma += NbOfAtomsPerVolume[i]
*GetCrossSectionPerAtom(aDynamicGamma, elm);
if (rval <= PartialSumSigma) { break; }
sum += natom[i]*ComputeCrossSectionPerAtom(e, elm->GetZasInt());
fTemp[i] = sum;
}
sum *= G4UniformRand();
for (std::size_t i=0; i<NumberOfElements; ++i)
{
if(sum <= fTemp[i]) {
elm = (*theElementVector)[i];
break;
}
}
}
return elm;
@@ -458,6 +477,7 @@ void G4GammaConversionToMuons::PrintInfoDefinition()
G4cout << " good cross section parametrization from "
<< G4BestUnit(LowestEnergyLimit,"Energy")
<< " to " << HighestEnergyLimit/GeV << " GeV for all Z." << G4endl;
G4cout << " cross section factor: " << CrossSecFactor << G4endl;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....