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geant4/source/processes/electromagnetic/standard/src/G4eCoulombScatteringModel.cc
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Gabriele Cosmo d0f911957d Import Geant4 10.6.0.beta source tree
2019-06-28 11:59:04 +02:00

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//
// ********************************************************************
// * License and Disclaimer *
// * *
// * The Geant4 software is copyright of the Copyright Holders of *
// * the Geant4 Collaboration. It is provided under the terms and *
// * conditions of the Geant4 Software License, included in the file *
// * LICENSE and available at http://cern.ch/geant4/license . These *
// * include a list of copyright holders. *
// * *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work make any representation or warranty, express or implied, *
// * regarding this software system or assume any liability for its *
// * use. Please see the license in the file LICENSE and URL above *
// * for the full disclaimer and the limitation of liability. *
// * *
// * This code implementation is the result of the scientific and *
// * technical work of the GEANT4 collaboration. *
// * By using, copying, modifying or distributing the software (or *
// * any work based on the software) you agree to acknowledge its *
// * use in resulting scientific publications, and indicate your *
// * acceptance of all terms of the Geant4 Software license. *
// ********************************************************************
//
//
// -------------------------------------------------------------------
//
// GEANT4 Class file
//
//
// File name: G4eCoulombScatteringModel
//
// Author: Vladimir Ivanchenko
//
// Creation date: 22.08.2005
//
// Modifications: V.Ivanchenko
//
//
//
// Class Description:
//
// -------------------------------------------------------------------
//
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
#include "G4eCoulombScatteringModel.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
#include "Randomize.hh"
#include "G4DataVector.hh"
#include "G4ElementTable.hh"
#include "G4ParticleChangeForGamma.hh"
#include "G4Proton.hh"
#include "G4ParticleTable.hh"
#include "G4IonTable.hh"
#include "G4ProductionCutsTable.hh"
#include "G4NucleiProperties.hh"
#include "G4Pow.hh"
#include "G4LossTableManager.hh"
#include "G4LossTableBuilder.hh"
#include "G4NistManager.hh"
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
using namespace std;
G4eCoulombScatteringModel::G4eCoulombScatteringModel(G4bool combined)
: G4VEmModel("eCoulombScattering"),
cosThetaMin(1.0),
cosThetaMax(-1.0),
isCombined(combined)
{
fParticleChange = nullptr;
fNistManager = G4NistManager::Instance();
theIonTable = G4ParticleTable::GetParticleTable()->GetIonTable();
theProton = G4Proton::Proton();
currentMaterial = nullptr;
fixedCut = -1.0;
pCuts = nullptr;
recoilThreshold = 0.0; // by default does not work
particle = nullptr;
currentCouple = nullptr;
wokvi = new G4WentzelOKandVIxSection(isCombined);
currentMaterialIndex = 0;
mass = CLHEP::proton_mass_c2;
elecRatio = 0.0;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
G4eCoulombScatteringModel::~G4eCoulombScatteringModel()
{
delete wokvi;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
void G4eCoulombScatteringModel::Initialise(const G4ParticleDefinition* part,
const G4DataVector& cuts)
{
SetupParticle(part);
currentCouple = nullptr;
// defined theta limit between single and multiple scattering
if(isCombined) {
cosThetaMin = 1.0;
G4double tet = PolarAngleLimit();
if(tet >= pi) { cosThetaMin = -1.0; }
else if(tet > 0.0) { cosThetaMin = cos(tet); }
}
wokvi->Initialise(part, cosThetaMin);
pCuts = &cuts;
/*
G4cout << "G4eCoulombScatteringModel::Initialise for "
<< part->GetParticleName() << " 1-cos(TetMin)= " << 1.0 - cosThetaMin
<< " 1-cos(TetMax)= " << 1. - cosThetaMax << G4endl;
G4cout << "cut[0]= " << (*pCuts)[0] << G4endl;
*/
if(!fParticleChange) {
fParticleChange = GetParticleChangeForGamma();
}
if(IsMaster() && mass < GeV && part->GetParticleName() != "GenericIon") {
InitialiseElementSelectors(part, cuts);
}
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
void G4eCoulombScatteringModel::InitialiseLocal(const G4ParticleDefinition*,
G4VEmModel* masterModel)
{
SetElementSelectors(masterModel->GetElementSelectors());
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
G4double
G4eCoulombScatteringModel::MinPrimaryEnergy(const G4Material* material,
const G4ParticleDefinition* part,
G4double)
{
SetupParticle(part);
// define cut using cuts for proton
G4double cut =
std::max(recoilThreshold, (*pCuts)[CurrentCouple()->GetIndex()]);
// find out lightest element
const G4ElementVector* theElementVector = material->GetElementVector();
G4int nelm = material->GetNumberOfElements();
// select lightest element
G4int Z = 300;
for (G4int j=0; j<nelm; ++j) {
Z = std::min(Z,(*theElementVector)[j]->GetZasInt());
}
G4int A = G4lrint(fNistManager->GetAtomicMassAmu(Z));
G4double targetMass = G4NucleiProperties::GetNuclearMass(A, Z);
G4double t = std::max(cut, 0.5*(cut + sqrt(2*cut*targetMass)));
return t;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
G4double G4eCoulombScatteringModel::ComputeCrossSectionPerAtom(
const G4ParticleDefinition* p,
G4double kinEnergy,
G4double Z, G4double,
G4double cutEnergy, G4double)
{
/*
G4cout << "### G4eCoulombScatteringModel::ComputeCrossSectionPerAtom for "
<< p->GetParticleName()<<" Z= "<<Z<<" e(MeV)= "<< kinEnergy/MeV
<< G4endl;
*/
G4double cross = 0.0;
elecRatio = 0.0;
if(p != particle) { SetupParticle(p); }
// cross section is set to zero to avoid problems in sample secondary
if(kinEnergy <= 0.0) { return cross; }
DefineMaterial(CurrentCouple());
G4double costmin = wokvi->SetupKinematic(kinEnergy, currentMaterial);
//G4cout << "cosThetaMax= "<<cosThetaMax<<" costmin= "<<costmin<< G4endl;
if(cosThetaMax < costmin) {
G4int iz = G4lrint(Z);
G4double cut = (0.0 < fixedCut) ? fixedCut : cutEnergy;
costmin = wokvi->SetupTarget(iz, cut);
//G4cout << "SetupTarget: Z= " << iz << " cut= " << cut << " "
// << costmin << G4endl;
G4double costmax = (1 == iz && particle == theProton && cosThetaMax < 0.0)
? 0.0 : cosThetaMax;
if(costmin > costmax) {
cross = wokvi->ComputeNuclearCrossSection(costmin, costmax)
+ wokvi->ComputeElectronCrossSection(costmin, costmax);
}
/*
if(p->GetParticleName() == "e-")
G4cout << "Z= " << Z << " e(MeV)= " << kinEnergy/MeV
<< " cross(b)= " << cross/barn << " 1-costmin= " << 1-costmin
<< " 1-costmax= " << 1-costmax
<< " 1-cosThetaMax= " << 1-cosThetaMax
<< " " << currentMaterial->GetName()
<< G4endl;
*/
}
//G4cout << "====== cross= " << cross << G4endl;
return cross;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
void G4eCoulombScatteringModel::SampleSecondaries(
std::vector<G4DynamicParticle*>* fvect,
const G4MaterialCutsCouple* couple,
const G4DynamicParticle* dp,
G4double cutEnergy,
G4double)
{
G4double kinEnergy = dp->GetKineticEnergy();
SetupParticle(dp->GetDefinition());
DefineMaterial(couple);
/*
G4cout << "G4eCoulombScatteringModel::SampleSecondaries e(MeV)= "
<< kinEnergy << " " << particle->GetParticleName()
<< " cut= " << cutEnergy<< G4endl;
*/
// Choose nucleus
G4double cut = (0.0 < fixedCut) ? fixedCut : cutEnergy;
wokvi->SetupKinematic(kinEnergy, currentMaterial);
const G4Element* currentElement = SelectTargetAtom(couple,particle,kinEnergy,
dp->GetLogKineticEnergy(),cut,kinEnergy);
G4int iz = currentElement->GetZasInt();
G4double costmin = wokvi->SetupTarget(iz, cut);
G4double costmax = (1 == iz && particle == theProton && cosThetaMax < 0.0)
? 0.0 : cosThetaMax;
if(costmin <= costmax) { return; }
G4double cross = wokvi->ComputeNuclearCrossSection(costmin, costmax);
G4double ecross = wokvi->ComputeElectronCrossSection(costmin, costmax);
G4double ratio = ecross/(cross + ecross);
G4int ia = SelectIsotopeNumber(currentElement);
G4double targetMass = G4NucleiProperties::GetNuclearMass(ia, iz);
wokvi->SetTargetMass(targetMass);
G4ThreeVector newDirection =
wokvi->SampleSingleScattering(costmin, costmax, ratio);
G4double cost = newDirection.z();
/*
G4cout << "SampleSec: e(MeV)= " << kinEnergy/MeV
<< " 1-costmin= " << 1-costmin
<< " 1-costmax= " << 1-costmax
<< " 1-cost= " << 1-cost
<< " ratio= " << ratio
<< G4endl;
*/
G4ThreeVector direction = dp->GetMomentumDirection();
newDirection.rotateUz(direction);
fParticleChange->ProposeMomentumDirection(newDirection);
// recoil sampling assuming a small recoil
// and first order correction to primary 4-momentum
G4double mom2 = wokvi->GetMomentumSquare();
G4double trec = mom2*(1.0 - cost)
/(targetMass + (mass + kinEnergy)*(1.0 - cost));
// the check likely not needed
trec = std::min(trec, kinEnergy);
G4double finalT = kinEnergy - trec;
G4double edep = 0.0;
/*
G4cout<<"G4eCoulombScatteringModel: finalT= "<<finalT<<" Trec= "
<<trec << " Z= " << iz << " A= " << ia
<< " tcut(keV)= " << (*pCuts)[currentMaterialIndex]/keV << G4endl;
*/
G4double tcut = recoilThreshold;
if(pCuts) { tcut= std::max(tcut,(*pCuts)[currentMaterialIndex]); }
if(trec > tcut) {
G4ParticleDefinition* ion = theIonTable->GetIon(iz, ia, 0);
G4ThreeVector dir = (direction*sqrt(mom2) -
newDirection*sqrt(finalT*(2*mass + finalT))).unit();
G4DynamicParticle* newdp = new G4DynamicParticle(ion, dir, trec);
fvect->push_back(newdp);
} else {
edep = trec;
fParticleChange->ProposeNonIonizingEnergyDeposit(edep);
}
// finelize primary energy and energy balance
// this threshold may be applied only because for low-enegry
// e+e- msc model is applied
if(finalT < 0.0) {
edep += finalT;
finalT = 0.0;
}
edep = std::max(edep, 0.0);
fParticleChange->SetProposedKineticEnergy(finalT);
fParticleChange->ProposeLocalEnergyDeposit(edep);
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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