G4ParticleChangeForLoss.cc

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// G4ParticleChangeForLoss class implementation
//
// Author: Hisaya Kurashige, 23 March 1998  
// Revision: Vladimir Ivantchenko, 16 January 2004
// --------------------------------------------------------------------
 
#include "G4ParticleChangeForLoss.hh"
#include "G4SystemOfUnits.hh"
#include "G4ExceptionSeverity.hh"
 
// --------------------------------------------------------------------
G4ParticleChangeForLoss::G4ParticleChangeForLoss()
{
  // Disable flag that is enabled in G4VParticleChange if G4VERBOSE.
  debugFlag = false;
}
 
// --------------------------------------------------------------------
void G4ParticleChangeForLoss::DumpInfo() const
{
  // use base-class DumpInfo
  G4VParticleChange::DumpInfo();
 
  G4long oldprc = G4cout.precision(8);
  G4cout << "      -----------------------------------------------" << G4endl;
  G4cout << "        G4ParticleChangeForLoss proposes: " << G4endl;
  G4cout << "        Charge (eplus)   : " << std::setw(20)
         << currentCharge / eplus << G4endl;
  G4cout << "        Kinetic Energy (MeV): " << std::setw(20)
         << proposedKinEnergy / MeV << G4endl;
  G4cout << "        Momentum Direct - x : " << std::setw(20)
         << proposedMomentumDirection.x() << G4endl;
  G4cout << "        Momentum Direct - y : " << std::setw(20)
         << proposedMomentumDirection.y() << G4endl;
  G4cout << "        Momentum Direct - z : " << std::setw(20)
         << proposedMomentumDirection.z() << G4endl;
  G4cout.precision(oldprc);
}
 
// --------------------------------------------------------------------
G4Step* G4ParticleChangeForLoss::UpdateStepForAlongStep(G4Step* pStep)
{
  const G4StepPoint* pPreStepPoint = pStep->GetPreStepPoint();
  G4StepPoint* pPostStepPoint = pStep->GetPostStepPoint();
 
  // accumulate change of the kinetic energy
  G4double preKinEnergy = pPreStepPoint->GetKineticEnergy();
  G4double kinEnergy =
    pPostStepPoint->GetKineticEnergy() + (proposedKinEnergy - preKinEnergy);
 
  pPostStepPoint->SetCharge(currentCharge);
 
  // calculate velocity
  if(kinEnergy > 0.0)
  {
    pPostStepPoint->SetKineticEnergy(kinEnergy);
 
    // assuming that mass>0, zero mass particles do not have energy loss
    pPostStepPoint->SetVelocity(CLHEP::c_light*ComputeBeta(kinEnergy));
  } 
  else 
  {
    pPostStepPoint->SetKineticEnergy(0.0);
    pPostStepPoint->SetVelocity(0.0);
  }
 
  if(isParentWeightProposed)
  {
    pPostStepPoint->SetWeight(theParentWeight);
  }
 
  pStep->AddTotalEnergyDeposit(theLocalEnergyDeposit);
  pStep->AddNonIonizingEnergyDeposit(theNonIonizingEnergyDeposit);
  return pStep;
}
 
// --------------------------------------------------------------------
G4Step* G4ParticleChangeForLoss::UpdateStepForPostStep(G4Step* pStep)
{
  G4StepPoint* pPostStepPoint = pStep->GetPostStepPoint();
 
  pPostStepPoint->SetCharge(currentCharge);
  pPostStepPoint->SetMomentumDirection(proposedMomentumDirection);
  if(proposedKinEnergy > 0.0)
  {
    pPostStepPoint->SetKineticEnergy(proposedKinEnergy);
 
    // assuming that mass>0, zero mass particles do not have energy loss
    pPostStepPoint->SetVelocity(CLHEP::c_light*ComputeBeta(proposedKinEnergy));
  }
  else
  {
    pPostStepPoint->SetKineticEnergy(0.0);
    pPostStepPoint->SetVelocity(0.0);
  }
  pPostStepPoint->SetPolarization(proposedPolarization);
 
  if(isParentWeightProposed)
  {
    pPostStepPoint->SetWeight(theParentWeight);
  }
 
  pStep->AddTotalEnergyDeposit(theLocalEnergyDeposit);
  pStep->AddNonIonizingEnergyDeposit(theNonIonizingEnergyDeposit);
  return pStep;
}