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This commit is contained in:
Gabriele Cosmo
2020-06-26 10:23:25 +02:00
parent c02c370437
commit 67ba86d073
1871 changed files with 174422 additions and 131884 deletions
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source/processes/electromagnetic/lowenergy/src/G4LivermoreGammaConversionModel.cc
+14 -257
View File
@@ -27,6 +27,11 @@
// 22 January 2012
// on base of G4LivermoreGammaConversionModel (original version)
// and G4LivermoreRayleighModel (MT version)
//
// Modifications: Zhuxin Li@CENBG
// 11 March 2020
// derives from G4PairProductionRelModel
// -------------------------------------------------------------------
#include "G4LivermoreGammaConversionModel.hh"
#include "G4Electron.hh"
@@ -44,17 +49,13 @@
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
G4double G4LivermoreGammaConversionModel::lowEnergyLimit = 2.*CLHEP::electron_mass_c2;
G4double G4LivermoreGammaConversionModel::tripletLowEnergy = 0.0;
G4double G4LivermoreGammaConversionModel::tripletHighEnergy = 100.0*CLHEP::GeV;
G4int G4LivermoreGammaConversionModel::verboseLevel = 0;
G4int G4LivermoreGammaConversionModel::nbinsTriplet = 0;
G4int G4LivermoreGammaConversionModel::maxZ = 99;
constexpr G4int G4LivermoreGammaConversionModel::maxZ;
G4LPhysicsFreeVector* G4LivermoreGammaConversionModel::data[] = {nullptr};
G4PhysicsLogVector* G4LivermoreGammaConversionModel::probTriplet[] = {nullptr};
G4LivermoreGammaConversionModel::G4LivermoreGammaConversionModel
(const G4ParticleDefinition*, const G4String& nam)
: G4VEmModel(nam),fParticleChange(nullptr)
(const G4ParticleDefinition* p, const G4String& nam)
: G4PairProductionRelModel(p,nam),fParticleChange(nullptr)
{
// Verbosity scale for debugging purposes:
// 0 = nothing
@@ -77,10 +78,6 @@ G4LivermoreGammaConversionModel::~G4LivermoreGammaConversionModel()
delete data[i];
data[i] = nullptr;
}
if(probTriplet[i]) {
delete probTriplet[i];
probTriplet[i] = nullptr;
}
}
}
}
@@ -90,7 +87,7 @@ G4LivermoreGammaConversionModel::~G4LivermoreGammaConversionModel()
void G4LivermoreGammaConversionModel::Initialise(
const G4ParticleDefinition* particle,
const G4DataVector& cuts)
{
{ G4PairProductionRelModel::Initialise(particle, cuts);
if (verboseLevel > 1)
{
G4cout << "Calling Initialise() of G4LivermoreGammaConversionModel."
@@ -103,12 +100,8 @@ void G4LivermoreGammaConversionModel::Initialise(
if(!fParticleChange) {
fParticleChange = GetParticleChangeForGamma();
if(GetTripletModel()) {
GetTripletModel()->SetParticleChange(fParticleChange);
}
}
if(GetTripletModel()) { GetTripletModel()->Initialise(particle, cuts); }
if(IsMaster())
{
// Initialise element selector
@@ -133,29 +126,11 @@ void G4LivermoreGammaConversionModel::Initialise(
{
G4int Z = std::min((*theElementVector)[j]->GetZasInt(), maxZ);
if(!data[Z]) { ReadData(Z, path); }
if(GetTripletModel()) { InitialiseProbability(particle, Z); }
}
}
}
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
void G4LivermoreGammaConversionModel::InitialiseLocal(
const G4ParticleDefinition*, G4VEmModel* masterModel)
{
SetElementSelectors(masterModel->GetElementSelectors());
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
G4double
G4LivermoreGammaConversionModel::MinPrimaryEnergy(const G4Material*,
const G4ParticleDefinition*,
G4double)
{
return lowEnergyLimit;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
@@ -184,7 +159,7 @@ void G4LivermoreGammaConversionModel::ReadData(size_t Z, const char* path)
}
data[Z] = new G4LPhysicsFreeVector();
std::ostringstream ost;
ost << datadir << "/livermore/pair/pp-cs-" << Z <<".dat";
ost << datadir << "/epics2017/pair/pp-cs-" << Z <<".dat";
std::ifstream fin(ost.str().c_str());
if( !fin.is_open())
@@ -205,8 +180,8 @@ void G4LivermoreGammaConversionModel::ReadData(size_t Z, const char* path)
data[Z]->Retrieve(fin, true);
}
// Activation of spline interpolation
data[Z] ->SetSpline(true);
// Activation of linear interpolation
data[Z] ->SetSpline(false); // EPICS2017 has more points -> linear is fine
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
@@ -250,237 +225,19 @@ G4double G4LivermoreGammaConversionModel::ComputeCrossSectionPerAtom(
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
void G4LivermoreGammaConversionModel::SampleSecondaries(
std::vector<G4DynamicParticle*>* fvect,
const G4MaterialCutsCouple* couple,
const G4DynamicParticle* aDynamicGamma,
G4double, G4double)
{
// The energies of the e+ e- secondaries are sampled using the Bethe - Heitler
// cross sections with Coulomb correction. A modified version of the random
// number techniques of Butcher & Messel is used (Nuc Phys 20(1960),15).
// Note 1 : Effects due to the breakdown of the Born approximation at low
// energy are ignored.
// Note 2 : The differential cross section implicitly takes account of
// pair creation in both nuclear and atomic electron fields. However triplet
// prodution is not generated.
if (verboseLevel > 1) {
G4cout << "Calling SampleSecondaries() of G4LivermoreGammaConversionModel"
<< G4endl;
}
G4double photonEnergy = aDynamicGamma->GetKineticEnergy();
G4ParticleMomentum photonDirection = aDynamicGamma->GetMomentumDirection();
G4double epsilon ;
G4double epsilon0Local = electron_mass_c2 / photonEnergy ;
CLHEP::HepRandomEngine* rndmEngine = G4Random::getTheEngine();
// Do it fast if photon energy < 2. MeV
static const G4double smallEnergy = 2.*CLHEP::MeV;
if (photonEnergy < smallEnergy )
{
epsilon = epsilon0Local + (0.5 - epsilon0Local) * rndmEngine->flat();
}
else
{
// Select randomly one element in the current material
const G4ParticleDefinition* particle = aDynamicGamma->GetDefinition();
const G4Element* element = SelectRandomAtom(couple,particle,photonEnergy);
G4int Z = element->GetZasInt();
// triplet production
if(GetTripletModel()) {
if(!probTriplet[Z]) { InitialiseForElement(particle, Z); }
/*
G4cout << "Liv: E= " << photonEnergy
<< " prob= " << probTriplet[Z]->Value(photonEnergy)
<< G4endl;
*/
if(probTriplet[Z] &&
rndmEngine->flat() < probTriplet[Z]->Value(photonEnergy)) {
GetTripletModel()->SampleSecondaries(fvect, couple, aDynamicGamma);
return;
}
}
G4IonisParamElm* ionisation = element->GetIonisation();
// Extract Coulomb factor for this Element
G4double fZ = 8. * (ionisation->GetlogZ3());
static const G4double midEnergy = 50.*CLHEP::MeV;
if (photonEnergy > midEnergy) { fZ += 8. * (element->GetfCoulomb()); }
// Limits of the screening variable
G4double screenFactor = 136. * epsilon0Local / (element->GetIonisation()->GetZ3());
G4double screenMax = G4Exp((42.24 - fZ)/8.368) + 0.952;
G4double screenMin = std::min(4.*screenFactor,screenMax);
// Limits of the energy sampling
G4double epsilon1 = 0.5 - 0.5 * std::sqrt(1. - screenMin / screenMax) ;
G4double epsilonMin = std::max(epsilon0Local,epsilon1);
G4double epsilonRange = 0.5 - epsilonMin ;
// Sample the energy rate of the created electron (or positron)
G4double screen;
G4double gReject;
G4double f10 = ScreenFunction1(screenMin) - fZ;
G4double f20 = ScreenFunction2(screenMin) - fZ;
G4double normF1 = std::max(f10 * epsilonRange * epsilonRange,0.);
G4double normF2 = std::max(1.5 * f20,0.);
do
{
if (normF1 > (normF1 + normF2)*rndmEngine->flat() )
{
epsilon = 0.5 - epsilonRange *G4Exp(G4Log(rndmEngine->flat())/3.);
screen = screenFactor / (epsilon * (1. - epsilon));
gReject = (ScreenFunction1(screen) - fZ) / f10 ;
}
else
{
epsilon = epsilonMin + epsilonRange * rndmEngine->flat();
screen = screenFactor / (epsilon * (1 - epsilon));
gReject = (ScreenFunction2(screen) - fZ) / f20 ;
}
} while ( gReject < rndmEngine->flat() );
} // End of epsilon sampling
// Fix charges randomly
G4double electronTotEnergy;
G4double positronTotEnergy;
if (rndmEngine->flat() > 0.5)
{
electronTotEnergy = (1. - epsilon) * photonEnergy;
positronTotEnergy = epsilon * photonEnergy;
}
else
{
positronTotEnergy = (1. - epsilon) * photonEnergy;
electronTotEnergy = epsilon * photonEnergy;
}
// Scattered electron (positron) angles. ( Z - axis along the parent photon)
// Universal distribution suggested by L. Urban (Geant3 manual (1993) Phys211),
// derived from Tsai distribution (Rev. Mod. Phys. 49, 421 (1977)
static const G4double a1 = 1.6;
static const G4double a2 = 0.5333333333;
G4double uu = -G4Log(rndmEngine->flat()*rndmEngine->flat());
G4double u = (0.25 > rndmEngine->flat()) ? uu*a1 : uu*a2;
G4double thetaEle = u*electron_mass_c2/electronTotEnergy;
G4double sinte = std::sin(thetaEle);
G4double coste = std::cos(thetaEle);
G4double thetaPos = u*electron_mass_c2/positronTotEnergy;
G4double sintp = std::sin(thetaPos);
G4double costp = std::cos(thetaPos);
G4double phi = twopi * rndmEngine->flat();
G4double sinp = std::sin(phi);
G4double cosp = std::cos(phi);
// Kinematics of the created pair:
// the electron and positron are assumed to have a symetric angular
// distribution with respect to the Z axis along the parent photon
G4double electronKineEnergy = std::max(0.,electronTotEnergy - electron_mass_c2) ;
G4ThreeVector electronDirection (sinte*cosp, sinte*sinp, coste);
electronDirection.rotateUz(photonDirection);
G4DynamicParticle* particle1 = new G4DynamicParticle (G4Electron::Electron(),
electronDirection,
electronKineEnergy);
// The e+ is always created
G4double positronKineEnergy = std::max(0.,positronTotEnergy - electron_mass_c2) ;
G4ThreeVector positronDirection (-sintp*cosp, -sintp*sinp, costp);
positronDirection.rotateUz(photonDirection);
// Create G4DynamicParticle object for the particle2
G4DynamicParticle* particle2 = new G4DynamicParticle(G4Positron::Positron(),
positronDirection,
positronKineEnergy);
// Fill output vector
fvect->push_back(particle1);
fvect->push_back(particle2);
// kill incident photon
fParticleChange->SetProposedKineticEnergy(0.);
fParticleChange->ProposeTrackStatus(fStopAndKill);
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
#include "G4AutoLock.hh"
namespace { G4Mutex LivermoreGammaConversionModelMutex = G4MUTEX_INITIALIZER; }
void G4LivermoreGammaConversionModel::InitialiseForElement(
const G4ParticleDefinition* part,
const G4ParticleDefinition*,
G4int Z)
{
if(GetTripletModel()) { GetTripletModel()->InitialiseForElement(part, Z); }
G4AutoLock l(&LivermoreGammaConversionModelMutex);
// G4cout << "G4LivermoreGammaConversionModel::InitialiseForElement Z= "
// << Z << G4endl;
if(!data[Z]) { ReadData(Z); }
if(GetTripletModel() && !probTriplet[Z]) { InitialiseProbability(part, Z); }
l.unlock();
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
void G4LivermoreGammaConversionModel::InitialiseProbability(
const G4ParticleDefinition* part, G4int Z)
{
if(!probTriplet[Z]) {
const G4Material* mat = (CurrentCouple()) ? CurrentCouple()->GetMaterial()
: nullptr;
if(0 == nbinsTriplet) {
tripletLowEnergy = GetTripletModel()->MinPrimaryEnergy(mat, part, 0.0);
tripletHighEnergy =
std::max(GetTripletModel()->HighEnergyLimit(), 10*tripletLowEnergy);
G4int nbins = G4EmParameters::Instance()->NumberOfBinsPerDecade();
nbinsTriplet = std::max(3,
(G4int)(nbins*G4Log(tripletHighEnergy/tripletLowEnergy)/(6*G4Log(10.))));
}
/*
G4cout << "G4LivermoreGammaConversionModel::InitialiseProbability Z= "
<< Z << " Nbin= " << nbinsTriplet
<< " Emin(MeV)= " << tripletLowEnergy
<< " Emax(MeV)= " << tripletHighEnergy << G4endl;
*/
probTriplet[Z] =
new G4PhysicsLogVector(tripletLowEnergy,tripletHighEnergy,nbinsTriplet);
probTriplet[Z]->SetSpline(true);
G4double zz = (G4double)Z;
// loop over bins
for(G4int j=0; j<=nbinsTriplet; ++j) {
G4double e = (probTriplet[Z])->Energy(j);
SetupForMaterial(part, mat, e);
G4double cross = ComputeCrossSectionPerAtom(part, e, zz);
G4double tcross =
GetTripletModel()->ComputeCrossSectionPerAtom(part, e, zz);
tcross = (0.0 < cross) ? tcross/cross : 0.0;
(probTriplet[Z])->PutValue(j, tcross);
//G4cout << j << ". E= " << e << " prob= " << tcross << G4endl;
}
}
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......