178 lines
6.1 KiB
C++
178 lines
6.1 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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// $Id$
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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: G4CoulombScattering
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//
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// Author: Vladimir Ivanchenko
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//
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// Creation date: 22.08.2004
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//
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// Modifications:
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// 01.08.06 V.Ivanchenko add choice between G4eCoulombScatteringModel and
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// G4CoulombScatteringModel
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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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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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#include "G4CoulombScattering.hh"
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#include "G4SystemOfUnits.hh"
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#include "G4eCoulombScatteringModel.hh"
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#include "G4Proton.hh"
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#include "G4LossTableManager.hh"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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using namespace std;
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G4CoulombScattering::G4CoulombScattering(const G4String& name)
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: G4VEmProcess(name),q2Max(TeV*TeV),isInitialised(false)
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{
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// G4cout << "G4CoulombScattering constructor "<< G4endl;
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SetBuildTableFlag(true);
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SetStartFromNullFlag(false);
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SetIntegral(true);
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SetSecondaryParticle(G4Proton::Proton());
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SetProcessSubType(fCoulombScattering);
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SetSplineFlag(true);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4CoulombScattering::~G4CoulombScattering()
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{}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4bool G4CoulombScattering::IsApplicable(const G4ParticleDefinition& p)
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{
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return (p.GetPDGCharge() != 0.0 && !p.IsShortLived());
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4CoulombScattering::InitialiseProcess(const G4ParticleDefinition* p)
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{
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// second initialisation not allowed for the time being
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// this means that polar angle limit change will not be appled
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// after first initialisation
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if(isInitialised) { return; }
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G4double a = G4LossTableManager::Instance()->FactorForAngleLimit()
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*CLHEP::hbarc/CLHEP::fermi;
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q2Max = 0.5*a*a;
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G4double theta = PolarAngleLimit();
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// restricted or non-restricted cross section table
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G4bool yes = false;
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if(theta == CLHEP::pi) { yes = true; }
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SetStartFromNullFlag(yes);
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/*
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G4cout << "### G4CoulombScattering::InitialiseProcess: "
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<< p->GetParticleName()
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<< " Emin(MeV)= " << MinKinEnergy()/MeV
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<< " Emax(TeV)= " << MaxKinEnergy()/TeV
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<< " nbins= " << LambdaBinning()
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<< " theta= " << theta
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<< G4endl;
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*/
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/*
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// second initialisation
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if(isInitialised) {
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G4VEmModel* mod = EmModel(1);
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mod->SetPolarAngleLimit(theta);
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mod = GetModelByIndex(1);
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if(mod) { mod->SetPolarAngleLimit(theta); }
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// first initialisation
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} else {
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*/
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isInitialised = true;
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G4double mass = p->GetPDGMass();
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G4String name = p->GetParticleName();
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//G4cout << name << " type: " << p->GetParticleType()
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//<< " mass= " << mass << G4endl;
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if (mass > GeV || p->GetParticleType() == "nucleus") {
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SetBuildTableFlag(false);
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if(name != "GenericIon") { SetVerboseLevel(0); }
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} else {
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if(name != "e-" && name != "e+" &&
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name != "mu+" && name != "mu-" && name != "pi+" &&
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name != "kaon+" && name != "proton" ) { SetVerboseLevel(0); }
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}
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if(!EmModel(1)) { SetEmModel(new G4eCoulombScatteringModel(), 1); }
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G4VEmModel* model = EmModel(1);
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G4double emin = std::max(MinKinEnergy(),model->LowEnergyLimit());
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G4double emax = std::min(MaxKinEnergy(),model->HighEnergyLimit());
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model->SetPolarAngleLimit(theta);
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model->SetLowEnergyLimit(emin);
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model->SetHighEnergyLimit(emax);
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AddEmModel(1, model);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4CoulombScattering::MinPrimaryEnergy(const G4ParticleDefinition* part,
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const G4Material* mat)
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{
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// Pure Coulomb scattering
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G4double emin = 0.0;
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// Coulomb scattering combined with multiple or hadronic scattering
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G4double theta = PolarAngleLimit();
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if(0.0 < theta) {
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G4double p2 = q2Max*mat->GetIonisation()->GetInvA23()/(1.0 - cos(theta));
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G4double mass = part->GetPDGMass();
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emin = sqrt(p2 + mass*mass) - mass;
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}
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return emin;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4CoulombScattering::PrintInfo()
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{
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G4cout << " " << PolarAngleLimit()/degree
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<< " < Theta(degree) < 180";
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if(q2Max < DBL_MAX) { G4cout << "; pLimit(GeV^1)= " << sqrt(q2Max)/GeV; }
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G4cout << G4endl;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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