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This commit is contained in:
Gabriele Cosmo
2017-06-30 10:49:55 +02:00
parent 3a5407696b
commit 1a1316fea4
2180 changed files with 237880 additions and 59109 deletions
Download Patch File Download Diff File Expand all files Collapse all files
source/processes/electromagnetic/lowenergy/src/G4LivermoreGammaConversionModel.cc
+143 -138
View File
@@ -29,29 +29,33 @@
// and G4LivermoreRayleighModel (MT version)
#include "G4LivermoreGammaConversionModel.hh"
#include "G4Electron.hh"
#include "G4Positron.hh"
#include "G4EmParameters.hh"
#include "G4ParticleChangeForGamma.hh"
#include "G4LPhysicsFreeVector.hh"
#include "G4PhysicsLogVector.hh"
#include "G4ProductionCutsTable.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
#include "G4Log.hh"
#include "G4Exp.hh"
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
using namespace std;
//....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;
G4LPhysicsFreeVector* G4LivermoreGammaConversionModel::data[] = {nullptr};
G4PhysicsLogVector* G4LivermoreGammaConversionModel::probTriplet[] = {nullptr};
G4LivermoreGammaConversionModel::G4LivermoreGammaConversionModel
(const G4ParticleDefinition*, const G4String& nam)
:G4VEmModel(nam),isInitialised(false),smallEnergy(2.*MeV)
: G4VEmModel(nam),fParticleChange(nullptr)
{
fParticleChange = nullptr;
lowEnergyLimit = 2.0*electron_mass_c2;
verboseLevel= 0;
// Verbosity scale for debugging purposes:
// 0 = nothing
// 1 = calculation of cross sections, file openings...
@@ -71,7 +75,11 @@ G4LivermoreGammaConversionModel::~G4LivermoreGammaConversionModel()
for(G4int i=0; i<maxZ; ++i) {
if(data[i]) {
delete data[i];
data[i] = 0;
data[i] = nullptr;
}
if(probTriplet[i]) {
delete probTriplet[i];
probTriplet[i] = nullptr;
}
}
}
@@ -89,10 +97,18 @@ void G4LivermoreGammaConversionModel::Initialise(
<< G4endl
<< "Energy range: "
<< LowEnergyLimit() / MeV << " MeV - "
<< HighEnergyLimit() / GeV << " GeV"
<< HighEnergyLimit() / GeV << " GeV isMater: " << IsMaster()
<< G4endl;
}
if(!fParticleChange) {
fParticleChange = GetParticleChangeForGamma();
if(GetTripletModel()) {
GetTripletModel()->SetParticleChange(fParticleChange);
}
}
if(GetTripletModel()) { GetTripletModel()->Initialise(particle, cuts); }
if(IsMaster())
{
// Initialise element selector
@@ -108,23 +124,20 @@ void G4LivermoreGammaConversionModel::Initialise(
for(G4int i=0; i<numOfCouples; ++i)
{
const G4Material* material =
theCoupleTable->GetMaterialCutsCouple(i)->GetMaterial();
const G4ElementVector* theElementVector = material->GetElementVector();
G4int nelm = material->GetNumberOfElements();
const G4MaterialCutsCouple* couple = theCoupleTable->GetMaterialCutsCouple(i);
SetCurrentCouple(couple);
const G4Material* mat = couple->GetMaterial();
const G4ElementVector* theElementVector = mat->GetElementVector();
G4int nelm = mat->GetNumberOfElements();
for (G4int j=0; j<nelm; ++j)
{
G4int Z = (G4int)(*theElementVector)[j]->GetZ();
if(Z < 1) { Z = 1; }
else if(Z > maxZ) { Z = maxZ; }
G4int Z = std::min((*theElementVector)[j]->GetZasInt(), maxZ);
if(!data[Z]) { ReadData(Z, path); }
if(GetTripletModel()) { InitialiseProbability(particle, Z); }
}
}
}
if(isInitialised) { return; }
fParticleChange = GetParticleChangeForGamma();
isInitialised = true;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
@@ -170,13 +183,7 @@ void G4LivermoreGammaConversionModel::ReadData(size_t Z, const char* path)
return;
}
}
//
data[Z] = new G4LPhysicsFreeVector();
//
std::ostringstream ost;
ost << datadir << "/livermore/pair/pp-cs-" << Z <<".dat";
std::ifstream fin(ost.str().c_str());
@@ -190,43 +197,36 @@ void G4LivermoreGammaConversionModel::ReadData(size_t Z, const char* path)
"em0003",FatalException,
ed,"G4LEDATA version should be G4EMLOW6.27 or later.");
return;
}
}
else
{
if(verboseLevel > 3) { G4cout << "File " << ost.str()
if(verboseLevel > 1) { G4cout << "File " << ost.str()
<< " is opened by G4LivermoreGammaConversionModel" << G4endl;}
data[Z]->Retrieve(fin, true);
}
// Activation of spline interpolation
data[Z] ->SetSpline(true);
data[Z] ->SetSpline(true);
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
G4double
G4LivermoreGammaConversionModel::ComputeCrossSectionPerAtom(const G4ParticleDefinition*,
G4double GammaEnergy,
G4double Z, G4double,
G4double, G4double)
G4double G4LivermoreGammaConversionModel::ComputeCrossSectionPerAtom(
const G4ParticleDefinition* particle,
G4double GammaEnergy, G4double Z, G4double, G4double, G4double)
{
if (verboseLevel > 1)
{
G4cout << "Calling ComputeCrossSectionPerAtom() of G4LivermoreGammaConversionModel"
<< G4endl;
G4cout << "G4LivermoreGammaConversionModel::ComputeCrossSectionPerAtom() Z= "
<< Z << G4endl;
}
if (GammaEnergy < lowEnergyLimit) { return 0.0; }
G4double xs = 0.0;
G4int intZ=G4int(Z);
if(intZ < 1 || intZ > maxZ) { return xs; }
G4int intZ = std::max(1, std::min(G4lrint(Z), maxZ));
G4LPhysicsFreeVector* pv = data[intZ];
@@ -234,7 +234,7 @@ G4LivermoreGammaConversionModel::ComputeCrossSectionPerAtom(const G4ParticleDefi
// do initialisation safely for MT mode
if(!pv)
{
InitialiseForElement(0, intZ);
InitialiseForElement(particle, intZ);
pv = data[intZ];
if(!pv) { return xs; }
}
@@ -243,13 +243,8 @@ G4LivermoreGammaConversionModel::ComputeCrossSectionPerAtom(const G4ParticleDefi
if(verboseLevel > 0)
{
G4int n = pv->GetVectorLength() - 1;
G4cout << "****** DEBUG: tcs value for Z=" << Z << " at energy (MeV)="
<< GammaEnergy/MeV << G4endl;
G4cout << " cs (Geant4 internal unit)=" << xs << G4endl;
G4cout << " -> first cs value in EADL data file (iu) =" << (*pv)[0] << G4endl;
G4cout << " -> last cs value in EADL data file (iu) =" << (*pv)[n] << G4endl;
G4cout << "*********************************************************" << G4endl;
G4cout << "*** Gamma conversion xs for Z=" << Z << " at energy E(MeV)="
<< GammaEnergy/MeV << " cs=" << xs/millibarn << " mb" << G4endl;
}
return xs;
@@ -265,15 +260,15 @@ void G4LivermoreGammaConversionModel::SampleSecondaries(
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.
// 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"
@@ -286,10 +281,13 @@ void G4LivermoreGammaConversionModel::SampleSecondaries(
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) * G4UniformRand();
epsilon = epsilon0Local + (0.5 - epsilon0Local) * rndmEngine->flat();
}
else
{
@@ -297,29 +295,34 @@ void G4LivermoreGammaConversionModel::SampleSecondaries(
const G4ParticleDefinition* particle = aDynamicGamma->GetDefinition();
const G4Element* element = SelectRandomAtom(couple,particle,photonEnergy);
G4int Z = element->GetZasInt();
if (element == 0)
{
G4cout << "G4LivermoreGammaConversionModel::SampleSecondaries - element = 0"
<< G4endl;
// 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();
if (ionisation == 0)
{
G4cout << "G4LivermoreGammaConversionModel::SampleSecondaries - ionisation = 0"
<< G4endl;
return;
}
// Extract Coulomb factor for this Element
G4double fZ = 8. * (ionisation->GetlogZ3());
if (photonEnergy > 50. * MeV) fZ += 8. * (element->GetfCoulomb());
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) ;
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) ;
@@ -328,7 +331,7 @@ void G4LivermoreGammaConversionModel::SampleSecondaries(
// Sample the energy rate of the created electron (or positron)
G4double screen;
G4double gReject ;
G4double gReject;
G4double f10 = ScreenFunction1(screenMin) - fZ;
G4double f20 = ScreenFunction2(screenMin) - fZ;
@@ -337,19 +340,19 @@ void G4LivermoreGammaConversionModel::SampleSecondaries(
do
{
if (normF1 / (normF1 + normF2) > G4UniformRand() )
if (normF1 > (normF1 + normF2)*rndmEngine->flat() )
{
epsilon = 0.5 - epsilonRange * std::pow(G4UniformRand(), 0.333333) ;
epsilon = 0.5 - epsilonRange *G4Exp(G4Log(rndmEngine->flat())/3.);
screen = screenFactor / (epsilon * (1. - epsilon));
gReject = (ScreenFunction1(screen) - fZ) / f10 ;
}
else
{
epsilon = epsilonMin + epsilonRange * G4UniformRand();
epsilon = epsilonMin + epsilonRange * rndmEngine->flat();
screen = screenFactor / (epsilon * (1 - epsilon));
gReject = (ScreenFunction2(screen) - fZ) / f20 ;
}
} while ( gReject < G4UniformRand() );
} while ( gReject < rndmEngine->flat() );
} // End of epsilon sampling
@@ -358,7 +361,7 @@ void G4LivermoreGammaConversionModel::SampleSecondaries(
G4double electronTotEnergy;
G4double positronTotEnergy;
if (G4UniformRand() > 0.5)
if (rndmEngine->flat() > 0.5)
{
electronTotEnergy = (1. - epsilon) * photonEnergy;
positronTotEnergy = epsilon * photonEnergy;
@@ -373,28 +376,22 @@ void G4LivermoreGammaConversionModel::SampleSecondaries(
// Universal distribution suggested by L. Urban (Geant3 manual (1993) Phys211),
// derived from Tsai distribution (Rev. Mod. Phys. 49, 421 (1977)
G4double u;
const G4double a1 = 0.625;
G4double a2 = 3. * a1;
// G4double d = 27. ;
// if (9. / (9. + d) > G4UniformRand())
if (0.25 > G4UniformRand())
{
u = - G4Log(G4UniformRand() * G4UniformRand()) / a1 ;
}
else
{
u = - G4Log(G4UniformRand() * G4UniformRand()) / a2 ;
}
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 thetaPos = u*electron_mass_c2/positronTotEnergy;
G4double phi = twopi * G4UniformRand();
G4double sinte = std::sin(thetaEle);
G4double coste = std::cos(thetaEle);
G4double dxEle= std::sin(thetaEle)*std::cos(phi),dyEle= std::sin(thetaEle)*std::sin(phi),dzEle=std::cos(thetaEle);
G4double dxPos=-std::sin(thetaPos)*std::cos(phi),dyPos=-std::sin(thetaPos)*std::sin(phi),dzPos=std::cos(thetaPos);
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
@@ -402,7 +399,7 @@ void G4LivermoreGammaConversionModel::SampleSecondaries(
G4double electronKineEnergy = std::max(0.,electronTotEnergy - electron_mass_c2) ;
G4ThreeVector electronDirection (dxEle, dyEle, dzEle);
G4ThreeVector electronDirection (sinte*cosp, sinte*sinp, coste);
electronDirection.rotateUz(photonDirection);
G4DynamicParticle* particle1 = new G4DynamicParticle (G4Electron::Electron(),
@@ -412,7 +409,7 @@ void G4LivermoreGammaConversionModel::SampleSecondaries(
// The e+ is always created
G4double positronKineEnergy = std::max(0.,positronTotEnergy - electron_mass_c2) ;
G4ThreeVector positronDirection (dxPos, dyPos, dzPos);
G4ThreeVector positronDirection (-sintp*cosp, -sintp*sinp, costp);
positronDirection.rotateUz(photonDirection);
// Create G4DynamicParticle object for the particle2
@@ -429,54 +426,62 @@ void G4LivermoreGammaConversionModel::SampleSecondaries(
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
G4double
G4LivermoreGammaConversionModel::ScreenFunction1(G4double screenVariable)
{
// Compute the value of the screening function 3*phi1 - phi2
G4double value;
if (screenVariable > 1.)
value = 42.24 - 8.368 * G4Log(screenVariable + 0.952);
else
value = 42.392 - screenVariable * (7.796 - 1.961 * screenVariable);
return value;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
G4double
G4LivermoreGammaConversionModel::ScreenFunction2(G4double screenVariable)
{
// Compute the value of the screening function 1.5*phi1 - 0.5*phi2
G4double value;
if (screenVariable > 1.)
value = 42.24 - 8.368 * G4Log(screenVariable + 0.952);
else
value = 41.405 - screenVariable * (5.828 - 0.8945 * screenVariable);
return value;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
#include "G4AutoLock.hh"
namespace { G4Mutex LivermoreGammaConversionModelMutex = G4MUTEX_INITIALIZER; }
void G4LivermoreGammaConversionModel::InitialiseForElement(
const G4ParticleDefinition*,
const G4ParticleDefinition* part,
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......