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This commit is contained in:
Gabriele Cosmo
2021-12-10 14:46:44 +01:00
committed by Ben Morgan
parent 6399a014b6
commit 80e2389dd8
3932 changed files with 202519 additions and 246221 deletions
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source/processes/electromagnetic/highenergy/src/G4AnnihiToMuPair.cc
+78 -61
View File
@@ -48,9 +48,12 @@
#include "G4Positron.hh"
#include "G4MuonPlus.hh"
#include "G4MuonMinus.hh"
#include "G4TauPlus.hh"
#include "G4TauMinus.hh"
#include "G4Material.hh"
#include "G4Step.hh"
#include "G4LossTableManager.hh"
#include "G4Exp.hh"
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
@@ -60,23 +63,34 @@ G4AnnihiToMuPair::G4AnnihiToMuPair(const G4String& processName,
G4ProcessType type):G4VDiscreteProcess (processName, type)
{
//e+ Energy threshold
const G4double Mu_massc2 = G4MuonPlus::MuonPlus()->GetPDGMass();
fLowEnergyLimit = 2.*Mu_massc2*Mu_massc2/electron_mass_c2 - electron_mass_c2;
if(processName == "AnnihiToTauPair") {
SetProcessSubType(fAnnihilationToTauTau);
part1 = G4TauPlus::TauPlus();
part2 = G4TauMinus::TauMinus();
fInfo = "e+e->tau+tau-";
} else {
SetProcessSubType(fAnnihilationToMuMu);
part1 = G4MuonPlus::MuonPlus();
part2 = G4MuonMinus::MuonMinus();
}
fMass = part1->GetPDGMass();
fLowEnergyLimit =
2.*fMass*fMass/CLHEP::electron_mass_c2 - CLHEP::electron_mass_c2;
//model is ok up to 1000 TeV due to neglected Z-interference
fHighEnergyLimit = 1000.*TeV;
fCurrentSigma = 0.0;
fCrossSecFactor = 1.;
SetProcessSubType(6);
G4LossTableManager::Instance()->Register(this);
fManager = G4LossTableManager::Instance();
fManager->Register(this);
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
G4AnnihiToMuPair::~G4AnnihiToMuPair() // (empty) destructor
{
G4LossTableManager::Instance()->DeRegister(this);
fManager->DeRegister(this);
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
@@ -89,8 +103,6 @@ G4bool G4AnnihiToMuPair::IsApplicable(const G4ParticleDefinition& particle)
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
void G4AnnihiToMuPair::BuildPhysicsTable(const G4ParticleDefinition&)
// Build cross section and mean free path tables
//here no tables, just calling PrintInfoDefinition
{
PrintInfoDefinition();
}
@@ -101,49 +113,54 @@ void G4AnnihiToMuPair::SetCrossSecFactor(G4double fac)
// Set the factor to artificially increase the cross section
{
fCrossSecFactor = fac;
G4cout << "The cross section for AnnihiToMuPair is artificially "
<< "increased by the CrossSecFactor=" << fCrossSecFactor << G4endl;
//G4cout << "The cross section for AnnihiToMuPair is artificially "
// << "increased by the CrossSecFactor=" << fCrossSecFactor << G4endl;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
G4double G4AnnihiToMuPair::ComputeCrossSectionPerAtom(G4double Epos, G4double Z)
G4double G4AnnihiToMuPair::ComputeCrossSectionPerElectron(const G4double e)
// Calculates the microscopic cross section in GEANT4 internal units.
// It gives a good description from threshold to 1000 GeV
{
static const G4double Mmuon = G4MuonPlus::MuonPlus()->GetPDGMass();
static const G4double Rmuon = CLHEP::elm_coupling/Mmuon; //classical particle radius
static const G4double Sig0 = CLHEP::pi*Rmuon*Rmuon/3.; //constant in crossSection
static const G4double pia = CLHEP::pi * CLHEP::fine_structure_const; // pi * alphaQED
G4double rmuon = CLHEP::elm_coupling/fMass; //classical particle radius
G4double sig0 = CLHEP::pi*rmuon*rmuon/3.; //constant in crossSection
const G4double pial = CLHEP::pi*CLHEP::fine_structure_const; // pi * alphaQED
G4double CrossSection = 0.;
if (Epos <= fLowEnergyLimit) return CrossSection;
if (e <= fLowEnergyLimit) return 0.0;
G4double xi = fLowEnergyLimit/Epos;
G4double piaxi = pia * sqrt(xi);
G4double SigmaEl = Sig0 * xi * (1.+xi/2.) * piaxi;
if( Epos>fLowEnergyLimit+1.e-5 ) SigmaEl /= (1.-std::exp( -piaxi/std::sqrt(1-xi) ));
CrossSection = SigmaEl*Z; // SigmaEl per electron * number of electrons per atom
return CrossSection;
const G4double xi = fLowEnergyLimit/e;
const G4double piaxi = pial * std::sqrt(xi);
G4double sigma = sig0 * xi * (1. + xi*0.5);
//G4cout << "### xi= " << xi << " piaxi=" << piaxi << G4endl;
// argument of the exponent below 0.1 or above 10
// Sigma per electron * number of electrons per atom
if(xi <= 1.0 - 100*piaxi*piaxi) {
sigma *= std::sqrt(1.0 - xi);
} else if( xi >= 1.0 - 0.01*piaxi*piaxi) {
sigma *= piaxi;
} else {
sigma *= piaxi/(1. - G4Exp( -piaxi/std::sqrt(1-xi) ));
}
//G4cout << "### sigma= " << sigma << G4endl;
return sigma;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
G4double G4AnnihiToMuPair::CrossSectionPerVolume(G4double PositronEnergy,
G4double G4AnnihiToMuPair::ComputeCrossSectionPerAtom(const G4double energy,
const G4double Z)
{
return ComputeCrossSectionPerElectron(energy)*Z;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
G4double G4AnnihiToMuPair::CrossSectionPerVolume(G4double energy,
const G4Material* aMaterial)
{
const G4ElementVector* theElementVector = aMaterial->GetElementVector();
const G4double* NbOfAtomsPerVolume = aMaterial->GetVecNbOfAtomsPerVolume();
G4double SIGMA = 0.0;
for ( size_t i=0 ; i < aMaterial->GetNumberOfElements() ; ++i )
{
G4double AtomicZ = (*theElementVector)[i]->GetZ();
SIGMA += NbOfAtomsPerVolume[i] *
ComputeCrossSectionPerAtom(PositronEnergy,AtomicZ);
}
return SIGMA;
return ComputeCrossSectionPerElectron(energy)*aMaterial->GetTotNbOfElectPerVolume();
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
@@ -153,14 +170,14 @@ G4double G4AnnihiToMuPair::GetMeanFreePath(const G4Track& aTrack,
// returns the positron mean free path in GEANT4 internal units
{
const G4DynamicParticle* aDynamicPositron = aTrack.GetDynamicParticle();
G4double PositronEnergy = aDynamicPositron->GetTotalEnergy();
G4double energy = aDynamicPositron->GetTotalEnergy();
const G4Material* aMaterial = aTrack.GetMaterial();
// cross section before step
fCurrentSigma = CrossSectionPerVolume(PositronEnergy, aMaterial);
fCurrentSigma = CrossSectionPerVolume(energy, aMaterial);
// increase the CrossSection by CrossSecFactor (default 1)
return (fCurrentSigma > 0.0) ? 1.0/(fCurrentSigma*fCrossSecFactor) : 0.0;
return (fCurrentSigma > 0.0) ? 1.0/(fCurrentSigma*fCrossSecFactor) : DBL_MAX;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
@@ -172,11 +189,10 @@ G4VParticleChange* G4AnnihiToMuPair::PostStepDoIt(const G4Track& aTrack,
//
{
aParticleChange.Initialize(aTrack);
static const G4double Mele=electron_mass_c2;
static const G4double Mmuon=G4MuonPlus::MuonPlus()->GetPDGMass();
// current Positron energy and direction, return if energy too low
const G4DynamicParticle *aDynamicPositron = aTrack.GetDynamicParticle();
const G4double Mele = CLHEP::electron_mass_c2;
G4double Epos = aDynamicPositron->GetTotalEnergy();
G4double xs = CrossSectionPerVolume(Epos, aTrack.GetMaterial());
@@ -200,32 +216,32 @@ G4VParticleChange* G4AnnihiToMuPair::PostStepDoIt(const G4Track& aTrack,
// generate phi
//
G4double phi=2.*CLHEP::pi*G4UniformRand();
G4double phi = 2.*CLHEP::pi*G4UniformRand();
G4double Ecm = sqrt(0.5*Mele*(Epos+Mele));
G4double Pcm = sqrt(Ecm*Ecm-Mmuon*Mmuon);
G4double beta = sqrt((Epos-Mele)/(Epos+Mele));
G4double gamma = Ecm/Mele; // =sqrt((Epos+Mele)/(2.*Mele));
G4double Ecm = std::sqrt(0.5*Mele*(Epos+Mele));
G4double Pcm = std::sqrt(Ecm*Ecm - fMass*fMass);
G4double beta = std::sqrt((Epos-Mele)/(Epos+Mele));
G4double gamma = Ecm/Mele;
G4double Pt = Pcm*sint;
// energy and momentum of the muons in the Lab
//
G4double EmuPlus = gamma*( Ecm+cost*beta*Pcm);
G4double EmuMinus = gamma*( Ecm-cost*beta*Pcm);
G4double PmuPlusZ = gamma*(beta*Ecm+cost* Pcm);
G4double PmuMinusZ = gamma*(beta*Ecm-cost* Pcm);
G4double PmuPlusX = Pt*cos(phi);
G4double PmuPlusY = Pt*sin(phi);
G4double PmuMinusX =-Pt*cos(phi);
G4double PmuMinusY =-Pt*sin(phi);
G4double EmuPlus = gamma*(Ecm + cost*beta*Pcm);
G4double EmuMinus = gamma*(Ecm - cost*beta*Pcm);
G4double PmuPlusZ = gamma*(beta*Ecm + cost*Pcm);
G4double PmuMinusZ = gamma*(beta*Ecm - cost*Pcm);
G4double PmuPlusX = Pt*std::cos(phi);
G4double PmuPlusY = Pt*std::sin(phi);
G4double PmuMinusX =-PmuPlusX;
G4double PmuMinusY =-PmuPlusY;
// absolute momenta
G4double PmuPlus = sqrt(Pt*Pt+PmuPlusZ *PmuPlusZ );
G4double PmuMinus = sqrt(Pt*Pt+PmuMinusZ*PmuMinusZ);
G4double PmuPlus = std::sqrt(Pt*Pt+PmuPlusZ *PmuPlusZ );
G4double PmuMinus = std::sqrt(Pt*Pt+PmuMinusZ*PmuMinusZ);
// mu+ mu- directions for Positron in z-direction
//
G4ThreeVector
MuPlusDirection ( PmuPlusX/PmuPlus, PmuPlusY/PmuPlus, PmuPlusZ/PmuPlus );
MuPlusDirection(PmuPlusX/PmuPlus, PmuPlusY/PmuPlus, PmuPlusZ/PmuPlus);
G4ThreeVector
MuMinusDirection(PmuMinusX/PmuMinus,PmuMinusY/PmuMinus,PmuMinusZ/PmuMinus);
@@ -235,13 +251,14 @@ G4VParticleChange* G4AnnihiToMuPair::PostStepDoIt(const G4Track& aTrack,
MuMinusDirection.rotateUz(PosiDirection);
aParticleChange.SetNumberOfSecondaries(2);
// create G4DynamicParticle object for the particle1
G4DynamicParticle* aParticle1= new G4DynamicParticle(
G4MuonPlus::MuonPlus(),MuPlusDirection,EmuPlus-Mmuon);
G4DynamicParticle* aParticle1 =
new G4DynamicParticle(part1, MuPlusDirection, EmuPlus-fMass);
aParticleChange.AddSecondary(aParticle1);
// create G4DynamicParticle object for the particle2
G4DynamicParticle* aParticle2= new G4DynamicParticle(
G4MuonMinus::MuonMinus(),MuMinusDirection,EmuMinus-Mmuon);
G4DynamicParticle* aParticle2 =
new G4DynamicParticle(part2, MuMinusDirection, EmuMinus-fMass);
aParticleChange.AddSecondary(aParticle2);
// Kill the incident positron
@@ -256,7 +273,7 @@ G4VParticleChange* G4AnnihiToMuPair::PostStepDoIt(const G4Track& aTrack,
void G4AnnihiToMuPair::PrintInfoDefinition()
{
G4String comments ="e+e->mu+mu- annihilation, atomic e- at rest, SubType=.";
G4String comments = fInfo + " annihilation, atomic e- at rest, SubType=";
G4cout << G4endl << GetProcessName() << ": " << comments
<< GetProcessSubType() << G4endl;
G4cout << " threshold at " << fLowEnergyLimit/CLHEP::GeV << " GeV"
source/processes/electromagnetic/highenergy/src/G4mplIonisationModel.cc
+11 -11
View File
@@ -229,11 +229,12 @@ void G4mplIonisationModel::SampleSecondaries(std::vector<G4DynamicParticle*>*,
G4double G4mplIonisationModel::SampleFluctuations(
const G4MaterialCutsCouple* couple,
const G4DynamicParticle* dp,
G4double tmax,
G4double length,
G4double meanLoss)
const G4double tcut,
const G4double tmax,
const G4double length,
const G4double meanLoss)
{
G4double siga = Dispersion(couple->GetMaterial(),dp,tmax,length);
G4double siga = Dispersion(couple->GetMaterial(),dp,tcut,tmax,length);
G4double loss = meanLoss;
siga = std::sqrt(siga);
G4double twomeanLoss = meanLoss + meanLoss;
@@ -258,17 +259,16 @@ G4double G4mplIonisationModel::SampleFluctuations(
G4double G4mplIonisationModel::Dispersion(const G4Material* material,
const G4DynamicParticle* dp,
G4double tmax,
G4double length)
const G4double tcut,
const G4double tmax,
const G4double length)
{
G4double siga = 0.0;
G4double tau = dp->GetKineticEnergy()/mass;
if(tau > 0.0) {
G4double electronDensity = material->GetElectronDensity();
G4double gam = tau + 1.0;
G4double invbeta2 = (gam*gam)/(tau * (tau+2.0));
siga = (invbeta2 - 0.5) * twopi_mc2_rcl2 * tmax * length
* electronDensity * chargeSquare;
const G4double beta = dp->GetBeta();
siga = (tmax/(beta*beta) - 0.5*tcut) * twopi_mc2_rcl2 * length
* material->GetElectronDensity() * chargeSquare;
}
return siga;
}
source/processes/electromagnetic/highenergy/src/G4mplIonisationWithDeltaModel.cc
+12 -12
View File
@@ -326,13 +326,14 @@ G4mplIonisationWithDeltaModel::SampleSecondaries(vector<G4DynamicParticle*>* vdp
G4double G4mplIonisationWithDeltaModel::SampleFluctuations(
const G4MaterialCutsCouple* couple,
const G4DynamicParticle* dp,
G4double tmax,
G4double length,
G4double meanLoss)
const G4double tcut,
const G4double tmax,
const G4double length,
const G4double meanLoss)
{
G4double siga = Dispersion(couple->GetMaterial(),dp,tmax,length);
G4double siga = Dispersion(couple->GetMaterial(),dp,tcut,tmax,length);
G4double loss = meanLoss;
siga = sqrt(siga);
siga = std::sqrt(siga);
G4double twomeanLoss = meanLoss + meanLoss;
if(twomeanLoss < siga) {
@@ -356,17 +357,16 @@ G4double G4mplIonisationWithDeltaModel::SampleFluctuations(
G4double
G4mplIonisationWithDeltaModel::Dispersion(const G4Material* material,
const G4DynamicParticle* dp,
G4double tmax,
G4double length)
const G4double tcut,
const G4double tmax,
const G4double length)
{
G4double siga = 0.0;
G4double tau = dp->GetKineticEnergy()/mass;
if(tau > 0.0) {
G4double electronDensity = material->GetElectronDensity();
G4double gam = tau + 1.0;
G4double invbeta2 = (gam*gam)/(tau * (tau+2.0));
siga = (invbeta2 - 0.5) * twopi_mc2_rcl2 * tmax * length
* electronDensity * chargeSquare;
const G4double beta = dp->GetBeta();
siga = (tmax/(beta*beta) - 0.5*tcut) * twopi_mc2_rcl2 * length
* material->GetElectronDensity() * chargeSquare;
}
return siga;
}