Gabriele Cosmo
248 lines
7.4 KiB
C++
248 lines
7.4 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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//
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// GEANT4 Class file
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//
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//
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// File name: G4ElectronIonPair
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//
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// Author: Vladimir Ivanchenko
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//
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// Creation date: 08.07.2008
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//
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// Modifications:
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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 "G4ElectronIonPair.hh"
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#include "G4SystemOfUnits.hh"
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#include "G4Material.hh"
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#include "G4MaterialTable.hh"
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#include "G4StepPoint.hh"
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#include "G4VProcess.hh"
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#include "G4ProcessType.hh"
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#include "G4Track.hh"
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#include "Randomize.hh"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4ElectronIonPair::G4ElectronIonPair(G4int verb)
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{
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verbose = verb;
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curMaterial = nullptr;
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curMeanEnergy = 0.0;
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nMaterials = 0;
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invFanoFactor = 1.0/0.2;
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Initialise();
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4ElectronIonPair::~G4ElectronIonPair() = default;
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4ElectronIonPair::MeanNumberOfIonsAlongStep(
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const G4ParticleDefinition* part,
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const G4Material* material,
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G4double edep,
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G4double niel)
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{
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G4double nion = 0.0;
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// NIEL does not provide ionisation clusters
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if(edep > niel) {
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// neutral particles do not produce ionisation along step
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if(part->GetPDGCharge() != 0.0) {
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// select material
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if(material != curMaterial) {
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curMaterial = material;
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curMeanEnergy = material->GetIonisation()->GetMeanEnergyPerIonPair();
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// if mean energy is not defined then look into G4 DB
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if(0.0 == curMeanEnergy) {
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curMeanEnergy = FindG4MeanEnergyPerIonPair(material);
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}
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}
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if(curMeanEnergy > 0.0) { nion = (edep - niel)/curMeanEnergy; }
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}
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}
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return nion;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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std::vector<G4ThreeVector>*
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G4ElectronIonPair::SampleIonsAlongStep(const G4Step* step)
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{
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std::vector<G4ThreeVector>* v = nullptr;
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G4int nion = SampleNumberOfIonsAlongStep(step);
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// sample ionisation along step
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if(nion > 0) {
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v = new std::vector<G4ThreeVector>;
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G4ThreeVector prePos = step->GetPreStepPoint()->GetPosition();
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G4ThreeVector deltaPos = step->GetPostStepPoint()->GetPosition() - prePos;
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for(G4int i=0; i<nion; ++i) {
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v->push_back( prePos + deltaPos*G4UniformRand() );
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}
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if(verbose > 1 ) {
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G4cout << "### G4ElectronIonPair::SampleIonisationPoints: "
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<< v->size() << " ion pairs are added" << G4endl;
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}
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}
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return v;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4int
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G4ElectronIonPair::ResidualeChargePostStep(const G4ParticleDefinition*,
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const G4TrackVector*,
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G4int subType) const
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{
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G4int nholes = 0;
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if(2 == subType || 12 == subType || 13 == subType) { nholes = 1; }
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return nholes;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double
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G4ElectronIonPair::FindG4MeanEnergyPerIonPair(const G4Material* mat) const
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{
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G4String name = mat->GetName();
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G4double res = 0.0;
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// is this material in the vector?
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for(G4int j=0; j<nMaterials; ++j) {
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if(name == g4MatNames[j]) {
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res = g4MatData[j];
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mat->GetIonisation()->SetMeanEnergyPerIonPair(res);
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if(verbose > 0) {
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G4cout << "### G4ElectronIonPair::FindG4MeanEnergyPerIonPair for "
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<< name << " Epair= " << res/eV << " eV is set"
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<< G4endl;
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}
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break;
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}
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}
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return res;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4ElectronIonPair:: DumpMeanEnergyPerIonPair() const
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{
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std::size_t nmat = G4Material::GetNumberOfMaterials();
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const G4MaterialTable* mtable = G4Material::GetMaterialTable();
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if(nmat > 0) {
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G4cout << "### G4ElectronIonPair: mean energy per ion pair available:"
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<< G4endl;
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for(std::size_t i=0; i<nmat; ++i) {
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const G4Material* mat = (*mtable)[i];
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G4double x = mat->GetIonisation()->GetMeanEnergyPerIonPair();
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if(x > 0.0) {
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G4cout << " " << mat->GetName() << " Epair= "
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<< x/eV << " eV" << G4endl;
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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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void G4ElectronIonPair::DumpG4MeanEnergyPerIonPair() const
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{
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if(nMaterials > 0) {
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G4cout << "### G4ElectronIonPair: mean energy per ion pair "
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<< " for Geant4 materials" << G4endl;
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for(G4int i=0; i<nMaterials; ++i) {
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G4cout << " " << g4MatNames[i] << " Epair= "
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<< g4MatData[i]/eV << " eV" << G4endl;
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}
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4ElectronIonPair::Initialise()
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{
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// ICRU Report 31, 1979
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g4MatNames.push_back("G4_Si");
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g4MatData.push_back(3.62*eV);
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g4MatNames.push_back("G4_Ge");
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g4MatData.push_back(2.97*eV);
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g4MatNames.push_back("G4_He");
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g4MatData.push_back(44.4*eV);
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g4MatNames.push_back("G4_N");
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g4MatData.push_back(36.4*eV);
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g4MatNames.push_back("G4_O");
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g4MatData.push_back(32.3*eV);
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g4MatNames.push_back("G4_Ne");
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g4MatData.push_back(36.8*eV);
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g4MatNames.push_back("G4_Ar");
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g4MatData.push_back(26.34*eV);
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g4MatNames.push_back("G4_Kr");
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g4MatData.push_back(24.1*eV);
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g4MatNames.push_back("G4_Xe");
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g4MatData.push_back(21.6*eV);
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g4MatNames.push_back("G4_lAr");
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g4MatData.push_back(23.6*eV);
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g4MatNames.push_back("G4_lKr");
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g4MatData.push_back(20.5*eV);
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g4MatNames.push_back("G4_lXe");
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g4MatData.push_back(15.6*eV);
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g4MatNames.push_back("G4_AIR");
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g4MatData.push_back(35.1*eV);
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nMaterials = (G4int)g4MatData.size();
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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