Gabriele Cosmo
267 lines
9.3 KiB
C++
267 lines
9.3 KiB
C++
//
|
|
// ********************************************************************
|
|
// * 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. *
|
|
// ********************************************************************
|
|
//
|
|
// $Id$
|
|
//
|
|
// -------------------------------------------------------------------
|
|
//
|
|
// GEANT4 Class file
|
|
//
|
|
//
|
|
// File name: G4eCoulombScatteringModel
|
|
//
|
|
// Author: Vladimir Ivanchenko
|
|
//
|
|
// Creation date: 22.08.2005
|
|
//
|
|
// Modifications:
|
|
//
|
|
// 01.08.06 V.Ivanchenko extend upper limit of table to TeV and review the
|
|
// logic of building - only elements from G4ElementTable
|
|
// 08.08.06 V.Ivanchenko build internal table in ekin scale, introduce faclim
|
|
// 19.08.06 V.Ivanchenko add inline function ScreeningParameter
|
|
// 09.10.07 V.Ivanchenko reorganized methods, add cut dependence in scattering off e-
|
|
// 09.06.08 V.Ivanchenko add SelectIsotope and sampling of the recoil ion
|
|
// 16.06.09 C.Consolandi fixed computation of effective mass
|
|
// 27.05.10 V.Ivanchenko added G4WentzelOKandVIxSection class to
|
|
// compute cross sections and sample scattering angle
|
|
//
|
|
//
|
|
// 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 "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(const G4String& nam)
|
|
: G4VEmModel(nam),
|
|
cosThetaMin(1.0),
|
|
cosThetaMax(-1.0),
|
|
isInitialised(false)
|
|
{
|
|
fParticleChange = 0;
|
|
fNistManager = G4NistManager::Instance();
|
|
theParticleTable = G4ParticleTable::GetParticleTable();
|
|
theProton = G4Proton::Proton();
|
|
currentMaterial = 0;
|
|
|
|
pCuts = 0;
|
|
|
|
lowEnergyThreshold = 1*keV; // particle will be killed for lower energy
|
|
recoilThreshold = 0.*keV; // by default does not work
|
|
|
|
particle = 0;
|
|
currentCouple = 0;
|
|
wokvi = new G4WentzelOKandVIxSection();
|
|
|
|
currentMaterialIndex = 0;
|
|
|
|
cosTetMinNuc = 1.0;
|
|
cosTetMaxNuc = -1.0;
|
|
elecRatio = 0.0;
|
|
mass = proton_mass_c2;
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
|
|
|
|
G4eCoulombScatteringModel::~G4eCoulombScatteringModel()
|
|
{
|
|
delete wokvi;
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
|
|
|
|
void G4eCoulombScatteringModel::Initialise(const G4ParticleDefinition* p,
|
|
const G4DataVector& cuts)
|
|
{
|
|
SetupParticle(p);
|
|
currentCouple = 0;
|
|
cosThetaMin = cos(PolarAngleLimit());
|
|
wokvi->Initialise(p, cosThetaMin);
|
|
/*
|
|
G4cout << "G4eCoulombScatteringModel: " << particle->GetParticleName()
|
|
<< " 1-cos(ThetaLimit)= " << 1 - cosThetaMin
|
|
<< " cos(thetaMax)= " << cosThetaMax
|
|
<< G4endl;
|
|
*/
|
|
pCuts = G4ProductionCutsTable::GetProductionCutsTable()->GetEnergyCutsVector(3);
|
|
/*
|
|
G4cout << "!!! G4eCoulombScatteringModel::Initialise for "
|
|
<< p->GetParticleName() << " cos(TetMin)= " << cosThetaMin
|
|
<< " cos(TetMax)= " << cosThetaMax <<G4endl;
|
|
G4cout << "cut0= " << cuts[0] << " cut1= " << cuts[1] << G4endl;
|
|
*/
|
|
if(!isInitialised) {
|
|
isInitialised = true;
|
|
fParticleChange = GetParticleChangeForGamma();
|
|
}
|
|
if(mass < GeV) {
|
|
InitialiseElementSelectors(p,cuts);
|
|
}
|
|
}
|
|
|
|
//....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;
|
|
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());
|
|
cosTetMinNuc = wokvi->SetupKinematic(kinEnergy, currentMaterial);
|
|
if(cosThetaMax < cosTetMinNuc) {
|
|
G4int iz = G4int(Z);
|
|
cosTetMinNuc = wokvi->SetupTarget(iz, cutEnergy);
|
|
cosTetMaxNuc = cosThetaMax;
|
|
if(iz == 1 && cosTetMaxNuc < 0.0 && particle == theProton) {
|
|
cosTetMaxNuc = 0.0;
|
|
}
|
|
cross = wokvi->ComputeNuclearCrossSection(cosTetMinNuc, cosTetMaxNuc);
|
|
elecRatio = wokvi->ComputeElectronCrossSection(cosTetMinNuc, cosThetaMax);
|
|
cross += elecRatio;
|
|
if(cross > 0.0) { elecRatio /= cross; }
|
|
}
|
|
/*
|
|
if(p->GetParticleName() == "e-")
|
|
G4cout << "e(MeV)= " << kinEnergy/MeV << " cross(b)= " << cross/barn
|
|
<< " 1-cosTetMinNuc= " << 1-cosTetMinNuc
|
|
<< " 1-cosTetMaxNuc= " << 1-cosTetMaxNuc
|
|
<< 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();
|
|
|
|
// absorb particle below low-energy limit to avoid situation
|
|
// when a particle has no energy loss
|
|
if(kinEnergy < lowEnergyThreshold) {
|
|
fParticleChange->SetProposedKineticEnergy(0.0);
|
|
fParticleChange->ProposeLocalEnergyDeposit(kinEnergy);
|
|
fParticleChange->ProposeNonIonizingEnergyDeposit(kinEnergy);
|
|
return;
|
|
}
|
|
SetupParticle(dp->GetDefinition());
|
|
DefineMaterial(couple);
|
|
/*
|
|
G4cout << "G4eCoulombScatteringModel::SampleSecondaries e(MeV)= "
|
|
<< kinEnergy << " " << particle->GetParticleName()
|
|
<< " cut= " << cutEnergy<< G4endl;
|
|
*/
|
|
// Choose nucleus
|
|
const G4Element* currentElement =
|
|
SelectRandomAtom(couple,particle,kinEnergy,cutEnergy,kinEnergy);
|
|
|
|
G4double Z = currentElement->GetZ();
|
|
|
|
if(ComputeCrossSectionPerAtom(particle,kinEnergy, Z,
|
|
kinEnergy, cutEnergy, kinEnergy) == 0.0)
|
|
{ return; }
|
|
|
|
G4int iz = G4int(Z);
|
|
G4int ia = SelectIsotopeNumber(currentElement);
|
|
G4double targetMass = G4NucleiProperties::GetNuclearMass(ia, iz);
|
|
wokvi->SetTargetMass(targetMass);
|
|
|
|
G4ThreeVector newDirection =
|
|
wokvi->SampleSingleScattering(cosTetMinNuc, cosThetaMax, elecRatio);
|
|
G4double cost = newDirection.z();
|
|
|
|
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));
|
|
G4double finalT = kinEnergy - trec;
|
|
//G4cout<<"G4eCoulombScatteringModel: finalT= "<<finalT<<" Trec= "<<trec<<G4endl;
|
|
if(finalT <= lowEnergyThreshold) {
|
|
trec = kinEnergy;
|
|
finalT = 0.0;
|
|
}
|
|
|
|
fParticleChange->SetProposedKineticEnergy(finalT);
|
|
G4double tcut = recoilThreshold;
|
|
if(pCuts) { tcut= std::max(tcut,(*pCuts)[currentMaterialIndex]); }
|
|
|
|
if(trec > tcut) {
|
|
G4ParticleDefinition* ion = theParticleTable->GetIon(iz, ia, 0.0);
|
|
G4ThreeVector dir = (direction*sqrt(mom2) -
|
|
newDirection*sqrt(finalT*(2*mass + finalT))).unit();
|
|
G4DynamicParticle* newdp = new G4DynamicParticle(ion, dir, trec);
|
|
fvect->push_back(newdp);
|
|
} else {
|
|
fParticleChange->ProposeLocalEnergyDeposit(trec);
|
|
fParticleChange->ProposeNonIonizingEnergyDeposit(trec);
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
|
|
|
|
|