Gabriele Cosmo
296 lines
9.8 KiB
C++
296 lines
9.8 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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// G4eSingleCoulombScatteringModel.cc
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// -------------------------------------------------------------------
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//
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// GEANT4 Class header file
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//
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// File name: G4eSingleCoulombScatteringModel
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//
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// Author: Cristina Consolandi
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//
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// Creation date: 20.10.2012
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//
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// Class Description:
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// Single Scattering model for electron-nuclei interaction.
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// Suitable for high energy electrons and low scattering angles.
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//
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//
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// Reference:
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// M.J. Boschini et al. "Non Ionizing Energy Loss induced by Electrons
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// in the Space Environment" Proc. of the 13th International Conference
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// on Particle Physics and Advanced Technology
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//
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// (13th ICPPAT, Como 3-7/10/2011), World Scientific (Singapore).
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// Available at: http://arxiv.org/abs/1111.4042v4
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//
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//
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// -------------------------------------------------------------------
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//
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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#include "G4eSingleCoulombScatteringModel.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 "G4ParticleChangeForGamma.hh"
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#include "G4Proton.hh"
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#include "G4ProductionCutsTable.hh"
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#include "G4NucleiProperties.hh"
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#include "G4NistManager.hh"
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#include "G4ParticleTable.hh"
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#include "G4IonTable.hh"
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#include "G4UnitsTable.hh"
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#include "G4EmParameters.hh"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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using namespace std;
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G4eSingleCoulombScatteringModel::G4eSingleCoulombScatteringModel(const G4String& nam)
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: G4VEmModel(nam),
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cosThetaMin(1.0)
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{
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fNistManager = G4NistManager::Instance();
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theIonTable = G4ParticleTable::GetParticleTable()->GetIonTable();
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fParticleChange = nullptr;
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pCuts=nullptr;
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currentMaterial = nullptr;
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currentElement = nullptr;
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currentCouple = nullptr;
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lowEnergyLimit = 0*keV;
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recoilThreshold = 0.*eV;
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XSectionModel = 1;
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FormFactor = 0;
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particle = nullptr;
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mass=0.0;
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currentMaterialIndex = -1;
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Mottcross = new G4ScreeningMottCrossSection();
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//G4cout <<"## G4eSingleCoulombScatteringModel: " << this << " " << Mottcross << G4endl;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4eSingleCoulombScatteringModel::~G4eSingleCoulombScatteringModel()
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{
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//G4cout <<"## G4eSingleCoulombScatteringModel: delete " << this << " " << Mottcross << G4endl;
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delete Mottcross;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4eSingleCoulombScatteringModel::Initialise(const G4ParticleDefinition* p,
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const G4DataVector& cuts)
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{
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G4EmParameters* param = G4EmParameters::Instance();
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SetupParticle(p);
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currentCouple = nullptr;
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currentMaterialIndex = -1;
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//cosThetaMin = cos(PolarAngleLimit());
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Mottcross->Initialise(p,cosThetaMin);
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pCuts = &cuts;
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//G4ProductionCutsTable::GetProductionCutsTable()->GetEnergyCutsVector(3);
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/*
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G4cout << "!!! G4eSingleCoulombScatteringModel::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()) {
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InitialiseElementSelectors(p,cuts);
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}
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FormFactor=param->NuclearFormfactorType();
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//G4cout<<"NUCLEAR FORM FACTOR: "<<FormFactor<<G4endl;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void
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G4eSingleCoulombScatteringModel::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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void G4eSingleCoulombScatteringModel::SetXSectionModel(const G4String& model)
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{
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if(model == "Fast" || model == "fast") { XSectionModel=1; }
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else if(model == "Precise" || model == "precise") { XSectionModel=0; }
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else {
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G4cout<<"G4eSingleCoulombScatteringModel WARNING: "<<model
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<<" is not a valid model name"<<G4endl;
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4double G4eSingleCoulombScatteringModel::ComputeCrossSectionPerAtom(
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const G4ParticleDefinition* p,
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G4double kinEnergy,
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G4double Z,
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G4double ,
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G4double,
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G4double )
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{
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SetupParticle(p);
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G4double cross =0.0;
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if(kinEnergy < lowEnergyLimit) return cross;
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DefineMaterial(CurrentCouple());
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//Total Cross section
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Mottcross->SetupKinematic(kinEnergy, Z);
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cross = Mottcross->NuclearCrossSection(FormFactor,XSectionModel);
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//cout<< "Compute Cross Section....cross "<<G4BestUnit(cross,"Surface") << " cm2 "<< cross/cm2 <<" Z: "<<Z<<" kinEnergy: "<<kinEnergy<<endl;
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//G4cout<<"Energy: "<<kinEnergy/MeV<<" Total Cross: "<<cross<<G4endl;
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return cross;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4eSingleCoulombScatteringModel::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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//cout<<"--- kinEnergy "<<kinEnergy<<endl;
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if(kinEnergy < lowEnergyLimit) return;
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DefineMaterial(couple);
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SetupParticle(dp->GetDefinition());
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// Choose nucleus
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//last two :cutEnergy= min e kinEnergy=max
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currentElement = SelectTargetAtom(couple, particle, kinEnergy,
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dp->GetLogKineticEnergy(), cutEnergy, kinEnergy);
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G4int iz = currentElement->GetZasInt();
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G4int ia = SelectIsotopeNumber(currentElement);
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G4double mass2 = G4NucleiProperties::GetNuclearMass(ia, iz);
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//G4cout<<"..Z: "<<Z<<" ..iz: "<<iz<<" ..ia: "<<ia<<" ..mass2: "<<mass2<<G4endl;
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Mottcross->SetupKinematic(kinEnergy, iz);
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G4double cross= Mottcross->NuclearCrossSection(FormFactor,XSectionModel);
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if(cross == 0.0) { return; }
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//cout<< "Energy: "<<kinEnergy/MeV<<" Z: "<<Z<<"....cross "<<G4BestUnit(cross,"Surface") << " cm2 "<< cross/cm2 <<endl;
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G4double z1 = Mottcross->GetScatteringAngle(FormFactor,XSectionModel);
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G4double sint = sin(z1);
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G4double cost = cos(z1);
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G4double phi = twopi* G4UniformRand();
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// kinematics in the Lab system
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G4double ptot = 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*sint*cos(phi));
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v1.setY(momCM*sint*sin(phi));
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v1.setZ(momCM*cost);
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// CM--->Lab
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v1.boost(bst);
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// Rotate to global system
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G4ThreeVector dir = dp->GetMomentumDirection();
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G4ThreeVector 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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//G4cout<<" Energy Transfered: "<<trec/eV<<G4endl;
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if(pCuts) {
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tcut= std::max(tcut,(*pCuts)[currentMaterialIndex]);
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//G4cout<<"Cuts: "<<(*pCuts)[currentMaterialIndex]/eV<<" eV"<<G4endl;
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//G4cout<<"Threshold: "<<tcut/eV<<" eV"<<G4endl;
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}
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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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//G4cout<<"Final Energy: "<<finalT/eV<<G4endl;
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if(finalT <= lowEnergyLimit) {
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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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