Gabriele Cosmo
406 lines
13 KiB
C++
406 lines
13 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
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// File name: G4PAIModel.cc
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//
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// Author: Vladimir.Grichine@cern.ch on base of V.Ivanchenko model interface
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//
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// Creation date: 05.10.2003
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//
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// Modifications:
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//
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// 17.08.04 V.Grichine, bug fixed for Tkin<=0 in SampleSecondary
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// 16.08.04 V.Grichine, bug fixed in massRatio for DEDX, CrossSection,
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// SampleSecondary
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// 08.04.05 Major optimisation of internal interfaces (V.Ivantchenko)
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// 26.07.09 Fixed logic to work with several materials (V.Ivantchenko)
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// 21.11.10 V. Grichine verbose flag for protons and G4PAYySection to
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// check sandia table
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// 12.06.13 V. Grichine Bug fixed in SampleSecondaries for scaled Tkin
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// (fMass -> proton_mass_c2)
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// 19.08.13 V.Ivanchenko extract data handling to G4PAIModelData class
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// added sharing of internal data between threads (MT migration)
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//
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#include "G4PAIModel.hh"
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#include "G4SystemOfUnits.hh"
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#include "G4PhysicalConstants.hh"
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#include "G4Region.hh"
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#include "G4MaterialCutsCouple.hh"
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#include "G4MaterialTable.hh"
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#include "G4RegionStore.hh"
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#include "Randomize.hh"
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#include "G4Electron.hh"
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#include "G4Positron.hh"
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#include "G4Poisson.hh"
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#include "G4Step.hh"
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#include "G4Material.hh"
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#include "G4DynamicParticle.hh"
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#include "G4ParticleDefinition.hh"
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#include "G4ParticleChangeForLoss.hh"
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#include "G4PAIModelData.hh"
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#include "G4DeltaAngle.hh"
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////////////////////////////////////////////////////////////////////////
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using namespace std;
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G4PAIModel::G4PAIModel(const G4ParticleDefinition* p, const G4String& nam)
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: G4VEmModel(nam),G4VEmFluctuationModel(nam),
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fVerbose(0),
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fModelData(nullptr),
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fParticle(nullptr)
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{
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fElectron = G4Electron::Electron();
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fPositron = G4Positron::Positron();
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fParticleChange = nullptr;
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if(p) { SetParticle(p); }
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else { SetParticle(fElectron); }
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// default generator
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SetAngularDistribution(new G4DeltaAngle());
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fLowestTcut = 12.5*CLHEP::eV;
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}
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////////////////////////////////////////////////////////////////////////////
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G4PAIModel::~G4PAIModel()
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{
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if(IsMaster()) { delete fModelData; }
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}
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////////////////////////////////////////////////////////////////////////////
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void G4PAIModel::Initialise(const G4ParticleDefinition* p,
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const G4DataVector& cuts)
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{
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if(fVerbose > 1) {
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G4cout<<"G4PAIModel::Initialise for "<<p->GetParticleName()<<G4endl;
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}
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SetParticle(p);
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fParticleChange = GetParticleChangeForLoss();
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if(IsMaster()) {
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delete fModelData;
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fMaterialCutsCoupleVector.clear();
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if(fVerbose > 1) {
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G4cout << "G4PAIModel instantiates data for " << p->GetParticleName()
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<< G4endl;
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}
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G4double tmin = LowEnergyLimit()*fRatio;
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G4double tmax = HighEnergyLimit()*fRatio;
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fModelData = new G4PAIModelData(tmin, tmax, fVerbose);
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// Prepare initialization
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const G4MaterialTable* theMaterialTable = G4Material::GetMaterialTable();
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size_t numOfMat = G4Material::GetNumberOfMaterials();
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size_t numRegions = fPAIRegionVector.size();
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// protect for unit tests
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if(0 == numRegions) {
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G4Exception("G4PAIModel::Initialise()","em0106",JustWarning,
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"no G4Regions are registered for the PAI model - World is used");
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fPAIRegionVector.push_back(G4RegionStore::GetInstance()
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->GetRegion("DefaultRegionForTheWorld", false));
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numRegions = 1;
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}
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if(fVerbose > 1) {
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G4cout << "G4PAIModel is defined for " << numRegions << " regions "
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<< "; number of materials " << numOfMat << G4endl;
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}
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for(size_t iReg = 0; iReg<numRegions; ++iReg) {
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const G4Region* curReg = fPAIRegionVector[iReg];
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G4Region* reg = const_cast<G4Region*>(curReg);
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for(size_t jMat = 0; jMat<numOfMat; ++jMat) {
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G4Material* mat = (*theMaterialTable)[jMat];
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const G4MaterialCutsCouple* cutCouple = reg->FindCouple(mat);
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size_t n = fMaterialCutsCoupleVector.size();
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/*
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G4cout << "Region: " << reg->GetName() << " " << reg
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<< " Couple " << cutCouple
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<< " PAI defined for " << n << " couples"
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<< " jMat= " << jMat << " " << mat->GetName()
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<< G4endl;
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*/
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if(nullptr != cutCouple) {
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if(fVerbose > 1) {
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G4cout << "Region <" << curReg->GetName() << "> mat <"
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<< mat->GetName() << "> CoupleIndex= "
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<< cutCouple->GetIndex()
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<< " " << p->GetParticleName()
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<< " cutsize= " << cuts.size() << G4endl;
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}
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// check if this couple is not already initialized
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G4bool isnew = true;
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if(0 < n) {
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for(size_t i=0; i<n; ++i) {
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G4cout << i << G4endl;
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if(cutCouple == fMaterialCutsCoupleVector[i]) {
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isnew = false;
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break;
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}
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}
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}
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// initialise data banks
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// G4cout << " isNew: " << isnew << " " << cutCouple << G4endl;
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if(isnew) {
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fMaterialCutsCoupleVector.push_back(cutCouple);
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fModelData->Initialise(cutCouple, this);
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}
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}
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}
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}
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InitialiseElementSelectors(p, cuts);
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}
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}
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/////////////////////////////////////////////////////////////////////////
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void G4PAIModel::InitialiseLocal(const G4ParticleDefinition* p,
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G4VEmModel* masterModel)
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{
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SetParticle(p);
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fModelData = static_cast<G4PAIModel*>(masterModel)->GetPAIModelData();
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fMaterialCutsCoupleVector =
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static_cast<G4PAIModel*>(masterModel)->GetVectorOfCouples();
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SetElementSelectors(masterModel->GetElementSelectors());
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}
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//////////////////////////////////////////////////////////////////////////////
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G4double G4PAIModel::MinEnergyCut(const G4ParticleDefinition*,
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const G4MaterialCutsCouple*)
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{
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return fLowestTcut;
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}
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//////////////////////////////////////////////////////////////////////////////
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G4double G4PAIModel::ComputeDEDXPerVolume(const G4Material*,
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const G4ParticleDefinition* p,
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G4double kineticEnergy,
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G4double cutEnergy)
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{
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//G4cout << "===1=== " << CurrentCouple()
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// << " idx= " << CurrentCouple()->GetIndex()
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// << " " << fMaterialCutsCoupleVector[0]
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// << G4endl;
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G4int coupleIndex = FindCoupleIndex(CurrentCouple());
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//G4cout << "===2=== " << coupleIndex << G4endl;
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if(0 > coupleIndex) { return 0.0; }
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G4double cut = std::min(MaxSecondaryEnergy(p, kineticEnergy), cutEnergy);
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G4double scaledTkin = kineticEnergy*fRatio;
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return fChargeSquare*fModelData->DEDXPerVolume(coupleIndex, scaledTkin,
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cut);
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}
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/////////////////////////////////////////////////////////////////////////
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G4double G4PAIModel::CrossSectionPerVolume( const G4Material*,
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const G4ParticleDefinition* p,
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G4double kineticEnergy,
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G4double cutEnergy,
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G4double maxEnergy )
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{
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//G4cout << "===3=== " << CurrentCouple()
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// << " idx= " << CurrentCouple()->GetIndex()
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// << " " << fMaterialCutsCoupleVector[0]
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// << G4endl;
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G4int coupleIndex = FindCoupleIndex(CurrentCouple());
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//G4cout << "===4=== " << coupleIndex << G4endl;
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if(0 > coupleIndex) { return 0.0; }
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G4double tmax = std::min(MaxSecondaryEnergy(p, kineticEnergy), maxEnergy);
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if(tmax <= cutEnergy) { return 0.0; }
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G4double scaledTkin = kineticEnergy*fRatio;
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return fChargeSquare*fModelData->CrossSectionPerVolume(coupleIndex,
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scaledTkin,
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cutEnergy,
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tmax);
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}
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///////////////////////////////////////////////////////////////////////////
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//
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// It is analog of PostStepDoIt in terms of secondary electron.
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//
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void G4PAIModel::SampleSecondaries(std::vector<G4DynamicParticle*>* vdp,
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const G4MaterialCutsCouple* matCC,
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const G4DynamicParticle* dp,
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G4double tmin,
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G4double maxEnergy)
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{
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G4int coupleIndex = FindCoupleIndex(matCC);
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//G4cout << "G4PAIModel::SampleSecondaries: coupleIndex= "<<coupleIndex<<G4endl;
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if(0 > coupleIndex) { return; }
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SetParticle(dp->GetDefinition());
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G4double kineticEnergy = dp->GetKineticEnergy();
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G4double tmax = MaxSecondaryEnergy(fParticle, kineticEnergy);
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if(maxEnergy < tmax) { tmax = maxEnergy; }
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if(tmin >= tmax) { return; }
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G4ThreeVector direction= dp->GetMomentumDirection();
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G4double scaledTkin = kineticEnergy*fRatio;
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G4double totalEnergy = kineticEnergy + fMass;
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G4double totalMomentum = sqrt(kineticEnergy*(totalEnergy+fMass));
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G4double deltaTkin =
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fModelData->SamplePostStepTransfer(coupleIndex, scaledTkin, tmin, tmax);
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//G4cout<<"G4PAIModel::SampleSecondaries; deltaKIn = "<<deltaTkin/keV
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// <<" keV "<< " Escaled(MeV)= " << scaledTkin << G4endl;
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if( !(deltaTkin <= 0.) && !(deltaTkin > 0)) {
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G4cout<<"G4PAIModel::SampleSecondaries; deltaKIn = "<<deltaTkin/keV
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<<" keV "<< " Escaled(MeV)= " << scaledTkin << G4endl;
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return;
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}
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if( deltaTkin <= 0.) { return; }
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if( deltaTkin > tmax) { deltaTkin = tmax; }
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const G4Element* anElement = SelectTargetAtom(matCC, fParticle, kineticEnergy,
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dp->GetLogKineticEnergy());
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G4int Z = G4lrint(anElement->GetZ());
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auto deltaRay = new G4DynamicParticle(fElectron,
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GetAngularDistribution()->SampleDirection(dp, deltaTkin,
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Z, matCC->GetMaterial()),
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deltaTkin);
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// primary change
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kineticEnergy -= deltaTkin;
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G4ThreeVector dir = totalMomentum*direction - deltaRay->GetMomentum();
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direction = dir.unit();
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fParticleChange->SetProposedKineticEnergy(kineticEnergy);
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fParticleChange->SetProposedMomentumDirection(direction);
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vdp->push_back(deltaRay);
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}
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///////////////////////////////////////////////////////////////////////
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G4double G4PAIModel::SampleFluctuations(const G4MaterialCutsCouple* matCC,
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const G4DynamicParticle* aParticle,
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const G4double tcut,
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const G4double,
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const G4double step,
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const G4double eloss)
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{
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G4int coupleIndex = FindCoupleIndex(matCC);
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if(0 > coupleIndex) { return eloss; }
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SetParticle(aParticle->GetDefinition());
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/*
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G4cout << "G4PAIModel::SampleFluctuations step(mm)= "<< step/mm
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<< " Eloss(keV)= " << eloss/keV << " in "
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<< matCC->Getmaterial()->GetName() << G4endl;
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*/
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G4double Tkin = aParticle->GetKineticEnergy();
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G4double scaledTkin = Tkin*fRatio;
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G4double loss = fModelData->SampleAlongStepTransfer(coupleIndex, Tkin,
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scaledTkin, tcut,
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step*fChargeSquare);
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// G4cout<<"PAIModel AlongStepLoss = "<<loss/keV<<" keV, on step = "
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//<<step/mm<<" mm"<<G4endl;
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return loss;
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}
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//////////////////////////////////////////////////////////////////////
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//
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// Returns the statistical estimation of the energy loss distribution variance
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//
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G4double G4PAIModel::Dispersion( const G4Material* material,
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const G4DynamicParticle* aParticle,
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const G4double tcut,
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const G4double tmax,
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const G4double step )
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{
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G4double particleMass = aParticle->GetMass();
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G4double electronDensity = material->GetElectronDensity();
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G4double kineticEnergy = aParticle->GetKineticEnergy();
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G4double q = aParticle->GetCharge()/eplus;
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G4double etot = kineticEnergy + particleMass;
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G4double beta2 = kineticEnergy*(kineticEnergy + 2.0*particleMass)/(etot*etot);
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G4double siga = (tmax/beta2 - 0.5*tcut) * twopi_mc2_rcl2 * step
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* electronDensity * q * q;
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return siga;
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}
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/////////////////////////////////////////////////////////////////////
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G4double G4PAIModel::MaxSecondaryEnergy( const G4ParticleDefinition* p,
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G4double kinEnergy)
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{
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SetParticle(p);
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G4double tmax = kinEnergy;
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if(p == fElectron) { tmax *= 0.5; }
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else if(p != fPositron) {
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G4double ratio= electron_mass_c2/fMass;
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G4double gamma= kinEnergy/fMass + 1.0;
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tmax = 2.0*electron_mass_c2*(gamma*gamma - 1.) /
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(1. + 2.0*gamma*ratio + ratio*ratio);
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}
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return tmax;
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}
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///////////////////////////////////////////////////////////////
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void G4PAIModel::DefineForRegion(const G4Region* r)
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{
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fPAIRegionVector.push_back(r);
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}
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///////////////////////////////////////////////////////////////
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