Gabriele Cosmo
121 lines
5.0 KiB
C++
121 lines
5.0 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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/// \file processes/phonon/src/G4PhononReflection.cc
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/// \brief Implementation of the G4PhononReflection class
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//
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// This process handles the interaction of phonons with
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// boundaries. Implementation of this class is highly
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// geometry dependent.Currently, phonons are killed when
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// they reach a boundary. If the other side of the
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// boundary was Al, a hit is registered.
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//
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// $Id: G4PhononReflection.cc 76885 2013-11-18 12:55:15Z gcosmo $
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//
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// 20131115 Throw exception if track's polarization state is invalid.
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#include "G4PhononReflection.hh"
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#include "G4ExceptionSeverity.hh"
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#include "G4GeometryTolerance.hh"
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#include "G4LatticePhysical.hh"
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#include "G4PhononLong.hh"
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#include "G4PhononTransFast.hh"
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#include "G4PhononTransSlow.hh"
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#include "G4PhysicalConstants.hh"
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#include "G4Step.hh"
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#include "G4StepPoint.hh"
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#include "G4SystemOfUnits.hh"
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#include "G4VParticleChange.hh"
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G4PhononReflection::G4PhononReflection(const G4String& aName)
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: G4VPhononProcess(aName),
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kCarTolerance(G4GeometryTolerance::GetInstance()->GetSurfaceTolerance()) {;}
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G4PhononReflection::~G4PhononReflection() {;}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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// Always return DBL_MAX and Forced. This ensures that the process is
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// called at the end of every step. In PostStepDoIt the process
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// decides whether the step encountered a volume boundary and a
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// reflection should be applied
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G4double G4PhononReflection::GetMeanFreePath(const G4Track&, G4double,
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G4ForceCondition* condition) {
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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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// This process handles the interaction of phonons with
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// boundaries. Implementation of this class is highly geometry
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// dependent.Currently, phonons are killed when they reach a
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// boundary. If the other side of the boundary was Al, a hit is
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// registered.
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G4VParticleChange* G4PhononReflection::PostStepDoIt(const G4Track& aTrack,
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const G4Step& aStep) {
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aParticleChange.Initialize(aTrack);
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//Check if current step is limited by a volume boundary
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G4StepPoint* postStepPoint = aStep.GetPostStepPoint();
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if (postStepPoint->GetStepStatus()!=fGeomBoundary) {
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//make sure that correct phonon velocity is used after the step
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int pol = GetPolarization(aTrack);
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if (pol < 0 || pol > 2) {
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G4Exception("G4PhononReflection::PostStepDoIt","Phonon001",
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EventMustBeAborted, "Track is not a phonon");
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return &aParticleChange; // NOTE: Will never get here
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}
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// FIXME: This should be using wave-vector, shouldn't it?
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G4double vg = theLattice->MapKtoV(pol, aTrack.GetMomentumDirection());
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//Since step was not a volume boundary, just set correct phonon velocity and return
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aParticleChange.ProposeVelocity(vg);
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return &aParticleChange;
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}
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// do nothing but return is the step is too short
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// This is to allow actual reflection where after
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// the first boundary crossing a second, infinitesimal
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// step occurs crossing back into the original volume
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if (aTrack.GetStepLength()<=kCarTolerance/2) {
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return &aParticleChange;
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}
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G4double eKin = aTrack.GetKineticEnergy();
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aParticleChange.ProposeNonIonizingEnergyDeposit(eKin);
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aParticleChange.ProposeTrackStatus(fStopAndKill);
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return &aParticleChange;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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