Gabriele Cosmo
177 lines
6.2 KiB
C++
177 lines
6.2 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: G4DynamicParticleMSC
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//
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// Author: Vladimir Ivanchenko
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//
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// Creation date: 17.08.2024
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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 "G4DynamicParticleMSC.hh"
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#include "G4PhysicalConstants.hh"
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#include "G4SystemOfUnits.hh"
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#include "G4EmProcessSubType.hh"
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#include "G4LossTableManager.hh"
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#include "G4Step.hh"
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#include "G4Track.hh"
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#include "G4Log.hh"
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#include "G4Exp.hh"
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namespace
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{
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constexpr G4double c_highland = 13.6*CLHEP::MeV;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4DynamicParticleMSC::G4DynamicParticleMSC()
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: G4VContinuousDiscreteProcess("dynPartMSC")
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{
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SetVerboseLevel(1);
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SetProcessSubType(fDynamicMultipleScattering);
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lManager = G4LossTableManager::Instance();
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lManager->Register(this);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4DynamicParticleMSC::~G4DynamicParticleMSC()
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{
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lManager->DeRegister(this);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4DynamicParticleMSC::PreStepInitialisation(const G4Track& track)
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{
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fMaterial = track.GetMaterial();
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fZeff = fMaterial->GetIonisation()->GetZeffective();
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auto dpart = track.GetDynamicParticle();
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fEkinPreStep = dpart->GetKineticEnergy();
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fBeta = dpart->GetBeta();
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fCharge = dpart->GetCharge()/CLHEP::eplus;
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fMass = std::max(dpart->GetMass(), CLHEP::electron_mass_c2);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4DynamicParticleMSC::AlongStepGetPhysicalInteractionLength(
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const G4Track& track, G4double, G4double, G4double&,
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G4GPILSelection* selection)
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{
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*selection = CandidateForSelection;
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PreStepInitialisation(track);
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// no step limit for the time being
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return DBL_MAX;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4DynamicParticleMSC::PostStepGetPhysicalInteractionLength(
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const G4Track&, G4double,
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G4ForceCondition* condition)
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{
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*condition = NotForced;
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return DBL_MAX;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4VParticleChange* G4DynamicParticleMSC::AlongStepDoIt(const G4Track& track,
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const G4Step& step)
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{
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fParticleChange.InitialiseMSC(track, step);
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// no energy loss
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if (fCharge == 0.0) { return &fParticleChange; }
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G4double geomLength = step.GetStepLength();
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G4double y = geomLength/fMaterial->GetRadlen();
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G4double theta0 = c_highland*std::abs(fCharge)*std::sqrt(y)*
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(1.0 + 0.038*G4Log(y*fCharge*fCharge/(fBeta*fBeta)))/fBeta;
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if (theta0 < 0.001) { return &fParticleChange; }
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G4double cost = 1.0;
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G4double r = G4UniformRand();
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if (theta0 < 1.0) {
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G4double theta2 = theta0*theta0;
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cost -= theta2*G4Log(1.0 + r*(G4Exp(2.0/theta2) - 1.0));
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} else {
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cost -= 2.0*r;
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}
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G4double phi = CLHEP::twopi*G4UniformRand();
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G4double sint = std::sqrt((1.0 - cost)*(1.0 + cost));
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fNewDir.set(sint*std::cos(phi), sint*std::sin(phi), cost);
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fNewDir.rotateUz(step.GetPostStepPoint()->GetMomentumDirection());
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fParticleChange.ProposeMomentumDirection(fNewDir);
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fParticleChange.ProposeTrueStepLength(geomLength);
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return &fParticleChange;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4DynamicParticleMSC::GetMeanFreePath(const G4Track&, G4double,
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G4ForceCondition* condition)
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{
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*condition = Forced;
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return DBL_MAX;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4DynamicParticleMSC::GetContinuousStepLimit(const G4Track& track,
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G4double previousStepSize,
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G4double currentMinimalStep,
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G4double& currentSafety)
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{
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G4GPILSelection selection = NotCandidateForSelection;
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G4double x = AlongStepGetPhysicalInteractionLength(track, previousStepSize,
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currentMinimalStep,
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currentSafety, &selection);
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return x;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4DynamicParticleMSC::ProcessDescription(std::ostream& out) const
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{
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out << "G4DynamicParticleMSC: no delta rays" << G4endl;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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