Gabriele Cosmo
320 lines
10 KiB
C++
320 lines
10 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// -------------------------------------------------------------------
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//
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// GEANT4 Class file
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//
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//
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// File name: G4hCoulombScatteringModel
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//
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// Author: Vladimir Ivanchenko
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//
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// Creation date: 08.06.2012 from G4eCoulombScatteringModel
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//
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// Modifications:
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//
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//
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// Class Description:
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//
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// -------------------------------------------------------------------
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//
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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#include "G4hCoulombScatteringModel.hh"
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#include "G4PhysicalConstants.hh"
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#include "G4SystemOfUnits.hh"
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#include "Randomize.hh"
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#include "G4DataVector.hh"
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#include "G4ElementTable.hh"
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#include "G4ParticleChangeForGamma.hh"
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#include "G4Proton.hh"
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#include "G4ParticleTable.hh"
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#include "G4IonTable.hh"
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#include "G4ProductionCutsTable.hh"
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#include "G4NucleiProperties.hh"
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#include "G4Pow.hh"
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#include "G4NistManager.hh"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4hCoulombScatteringModel::G4hCoulombScatteringModel(G4bool combined)
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: G4VEmModel("hCoulombScattering"),
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cosThetaMin(1.0),
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cosThetaMax(-1.0),
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isCombined(combined)
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{
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fParticleChange = nullptr;
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fNistManager = G4NistManager::Instance();
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theIonTable = G4ParticleTable::GetParticleTable()->GetIonTable();
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theProton = G4Proton::Proton();
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currentMaterial = nullptr;
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fixedCut = -1.0;
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pCuts = nullptr;
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recoilThreshold = 0.0; // by default does not work
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particle = nullptr;
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currentCouple = nullptr;
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wokvi = new G4WentzelVIRelXSection();
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currentMaterialIndex = 0;
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mass = CLHEP::proton_mass_c2;
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elecRatio = 0.0;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4hCoulombScatteringModel::~G4hCoulombScatteringModel()
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{
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delete wokvi;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4hCoulombScatteringModel::Initialise(const G4ParticleDefinition* part,
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const G4DataVector& cuts)
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{
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SetupParticle(part);
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currentCouple = nullptr;
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// defined theta limit between single and multiple scattering
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isCombined = true;
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G4double tet = PolarAngleLimit();
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if(tet <= 0.0) {
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cosThetaMin = 1.0;
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isCombined = false;
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} else if(tet >= CLHEP::pi) {
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cosThetaMin = -1.0;
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} else {
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cosThetaMin = std::cos(tet);
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}
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wokvi->Initialise(part, cosThetaMin);
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/*
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G4cout << "G4hCoulombScatteringModel: " << particle->GetParticleName()
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<< " 1-cos(ThetaLimit)= " << 1 - cosThetaMin
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<< " cos(thetaMax)= " << cosThetaMax
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<< G4endl;
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*/
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pCuts = &cuts;
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//G4ProductionCutsTable::GetProductionCutsTable()->GetEnergyCutsVector(3);
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/*
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G4cout << "!!! G4hCoulombScatteringModel::Initialise for "
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<< part->GetParticleName() << " cos(TetMin)= " << cosThetaMin
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<< " cos(TetMax)= " << cosThetaMax <<G4endl;
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G4cout << "cut= " << (*pCuts)[0] << " cut1= " << (*pCuts)[1] << G4endl;
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*/
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if(!fParticleChange) {
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fParticleChange = GetParticleChangeForGamma();
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}
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if(IsMaster() && mass < CLHEP::GeV && part->GetParticleName() != "GenericIon") {
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InitialiseElementSelectors(part, cuts);
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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void G4hCoulombScatteringModel::InitialiseLocal(const G4ParticleDefinition*,
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G4VEmModel* masterModel)
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{
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SetElementSelectors(masterModel->GetElementSelectors());
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double
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G4hCoulombScatteringModel::MinPrimaryEnergy(const G4Material* material,
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const G4ParticleDefinition* part,
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G4double)
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{
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SetupParticle(part);
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// define cut using cuts for proton
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G4double cut =
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std::max(recoilThreshold, (*pCuts)[CurrentCouple()->GetIndex()]);
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// find out lightest element
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const G4ElementVector* theElementVector = material->GetElementVector();
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std::size_t nelm = material->GetNumberOfElements();
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// select lightest element
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G4int Z = 300;
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for (std::size_t j=0; j<nelm; ++j) {
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Z = std::min(Z,(*theElementVector)[j]->GetZasInt());
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}
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G4int A = G4lrint(fNistManager->GetAtomicMassAmu(Z));
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G4double targetMass = G4NucleiProperties::GetNuclearMass(A, Z);
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G4double t = std::max(cut, 0.5*(cut + std::sqrt(2*cut*targetMass)));
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return t;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4double G4hCoulombScatteringModel::ComputeCrossSectionPerAtom(
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const G4ParticleDefinition* p,
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G4double kinEnergy,
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G4double Z, G4double,
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G4double cutEnergy, G4double)
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{
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//G4cout << "### G4hCoulombScatteringModel::ComputeCrossSectionPerAtom for "
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//<< p->GetParticleName()<<" Z= "<<Z<<" e(MeV)= "<< kinEnergy/MeV << G4endl;
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G4double cross = 0.0;
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elecRatio = 0.0;
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if(p != particle) { SetupParticle(p); }
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// cross section is set to zero to avoid problems in sample secondary
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if(kinEnergy <= 0.0) { return cross; }
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DefineMaterial(CurrentCouple());
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G4int iz = G4lrint(Z);
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G4double tmass = (1 == iz) ? proton_mass_c2 :
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fNistManager->GetAtomicMassAmu(iz)*amu_c2;
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wokvi->SetTargetMass(tmass);
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G4double costmin =
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wokvi->SetupKinematic(kinEnergy, currentMaterial);
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if(cosThetaMax < costmin) {
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G4double cut = (0.0 < fixedCut) ? fixedCut : cutEnergy;
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costmin = wokvi->SetupTarget(iz, cut);
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G4double costmax =
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(1 == iz && particle == theProton && cosThetaMax < 0.0)
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? 0.0 : cosThetaMax;
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if(costmin > costmax) {
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cross = wokvi->ComputeNuclearCrossSection(costmin, costmax)
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+ wokvi->ComputeElectronCrossSection(costmin, costmax);
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}
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/*
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if(p->GetParticleName() == "mu+")
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G4cout << "e(MeV)= " << kinEnergy/MeV << " cross(b)= " << cross/barn
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<< " 1-costmin= " << 1-costmin
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<< " 1-costmax= " << 1-costmax
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<< " 1-cosThetaMax= " << 1-cosThetaMax
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<< G4endl;
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*/
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}
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return cross;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4hCoulombScatteringModel::SampleSecondaries(
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std::vector<G4DynamicParticle*>* fvect,
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const G4MaterialCutsCouple* couple,
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const G4DynamicParticle* dp,
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G4double cutEnergy,
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G4double)
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{
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G4double kinEnergy = dp->GetKineticEnergy();
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SetupParticle(dp->GetDefinition());
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DefineMaterial(couple);
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// Choose nucleus
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G4double cut = (0.0 < fixedCut) ? fixedCut : cutEnergy;
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const G4Element* elm = SelectRandomAtom(couple,particle,
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kinEnergy,cut,kinEnergy);
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G4int iz = elm->GetZasInt();
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G4int ia = SelectIsotopeNumber(elm);
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G4double mass2 = G4NucleiProperties::GetNuclearMass(ia, iz);
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wokvi->SetTargetMass(mass2);
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wokvi->SetupKinematic(kinEnergy, currentMaterial);
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G4double costmin = wokvi->SetupTarget(iz, cut);
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G4double costmax = (1 == iz && particle == theProton && cosThetaMax < 0.0)
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? 0.0 : cosThetaMax;
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if(costmin <= costmax) { return; }
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G4double cross = wokvi->ComputeNuclearCrossSection(costmin, costmax);
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G4double ecross = wokvi->ComputeElectronCrossSection(costmin, costmax);
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G4double ratio = ecross/(cross + ecross);
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G4ThreeVector newDirection =
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wokvi->SampleSingleScattering(costmin, costmax, ratio);
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// kinematics in the Lab system
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G4double ptot = std::sqrt(kinEnergy*(kinEnergy + 2.0*mass));
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G4double e1 = mass + kinEnergy;
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// Lab. system kinematics along projectile direction
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G4LorentzVector v0 = G4LorentzVector(0, 0, ptot, e1+mass2);
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G4LorentzVector v1 = G4LorentzVector(0, 0, ptot, e1);
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G4ThreeVector bst = v0.boostVector();
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v1.boost(-bst);
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// CM projectile
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G4double momCM = v1.pz();
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// Momentum after scattering of incident particle
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v1.setX(momCM*newDirection.x());
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v1.setY(momCM*newDirection.y());
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v1.setZ(momCM*newDirection.z());
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// CM--->Lab
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v1.boost(bst);
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G4ThreeVector dir = dp->GetMomentumDirection();
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newDirection = v1.vect().unit();
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newDirection.rotateUz(dir);
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fParticleChange->ProposeMomentumDirection(newDirection);
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// recoil
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v0 -= v1;
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G4double trec = std::max(v0.e() - mass2, 0.0);
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G4double edep = 0.0;
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G4double tcut = recoilThreshold;
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if(pCuts) { tcut= std::max(tcut,(*pCuts)[currentMaterialIndex]); }
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if(trec > tcut) {
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G4ParticleDefinition* ion = theIonTable->GetIon(iz, ia, 0);
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newDirection = v0.vect().unit();
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newDirection.rotateUz(dir);
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auto newdp = new G4DynamicParticle(ion, newDirection, trec);
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fvect->push_back(newdp);
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} else if(trec > 0.0) {
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edep = trec;
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fParticleChange->ProposeNonIonizingEnergyDeposit(edep);
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}
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// finelize primary energy and energy balance
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G4double finalT = v1.e() - mass;
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if(finalT < 0.0) {
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edep += finalT;
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finalT = 0.0;
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}
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edep = std::max(edep, 0.0);
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fParticleChange->SetProposedKineticEnergy(finalT);
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fParticleChange->ProposeLocalEnergyDeposit(edep);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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