G4ParticleChangeForMSC.cc

Go to the documentation of this file.

//
// ********************************************************************
// * License and Disclaimer                                           *
// *                                                                  *
// * The  Geant4 software  is  copyright of the Copyright Holders  of *
// * the Geant4 Collaboration.  It is provided  under  the terms  and *
// * conditions of the Geant4 Software License,  included in the file *
// * LICENSE and available at  http://cern.ch/geant4/license .  These *
// * include a list of copyright holders.                             *
// *                                                                  *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work  make  any representation or  warranty, express or implied, *
// * regarding  this  software system or assume any liability for its *
// * use.  Please see the license in the file  LICENSE  and URL above *
// * for the full disclaimer and the limitation of liability.         *
// *                                                                  *
// * This  code  implementation is the result of  the  scientific and *
// * technical work of the GEANT4 collaboration.                      *
// * By using,  copying,  modifying or  distributing the software (or *
// * any work based  on the software)  you  agree  to acknowledge its *
// * use  in  resulting  scientific  publications,  and indicate your *
// * acceptance of all terms of the Geant4 Software license.          *
// ********************************************************************
//
// G4ParticleChangeForMSC class implementation
//
// Author: Hisaya Kurashige, 23 March 1998  
// Revision: Vladimir Ivantchenko, 16 January 2004
// --------------------------------------------------------------------
 
#include "G4ParticleChangeForMSC.hh"
#include "G4SystemOfUnits.hh"
#include "G4Track.hh"
#include "G4Step.hh"
#include "G4DynamicParticle.hh"
#include "G4ExceptionSeverity.hh"
 
// --------------------------------------------------------------------
G4ParticleChangeForMSC::G4ParticleChangeForMSC()
  : G4VParticleChange()
{
}
 
// --------------------------------------------------------------------
G4ParticleChangeForMSC::~G4ParticleChangeForMSC()
{
}
 
// --------------------------------------------------------------------
G4ParticleChangeForMSC::
G4ParticleChangeForMSC(const G4ParticleChangeForMSC& right)
  : G4VParticleChange(right)
{
  theMomentumDirection = right.theMomentumDirection;
  thePosition          = right.thePosition;
}
 
// --------------------------------------------------------------------
G4ParticleChangeForMSC&
G4ParticleChangeForMSC::operator=(const G4ParticleChangeForMSC& right)
{
  if(this != &right)
  {
    theListOfSecondaries          = right.theListOfSecondaries;
    theSizeOftheListOfSecondaries = right.theSizeOftheListOfSecondaries;
    theNumberOfSecondaries        = right.theNumberOfSecondaries;
    theStatusChange               = right.theStatusChange;
    theLocalEnergyDeposit         = right.theLocalEnergyDeposit;
    theSteppingControlFlag        = right.theSteppingControlFlag;
    theTrueStepLength             = right.theTrueStepLength;
 
    theMomentumDirection = right.theMomentumDirection;
    thePosition          = right.thePosition;
  }
  return *this;
}
 
// --------------------------------------------------------------------
G4Step* G4ParticleChangeForMSC::UpdateStepForAlongStep(G4Step* pStep)
{
  // update the G4Step specific attributes
  pStep->SetStepLength(theTrueStepLength);
  theStatusChange = pStep->GetTrack()->GetTrackStatus();
 
  // multiple scattering calculates the final state of the particle
  G4StepPoint* pPostStepPoint = pStep->GetPostStepPoint();
 
  // update  momentum direction
  pPostStepPoint->SetMomentumDirection(theMomentumDirection);
 
  // update position
  pPostStepPoint->SetPosition(thePosition);
  return pStep;
}
 
// --------------------------------------------------------------------
G4Step* G4ParticleChangeForMSC::UpdateStepForPostStep(G4Step* pStep)
{
  // multiple scattering calculates the final state of the particle
  G4StepPoint* pPostStepPoint = pStep->GetPostStepPoint();
 
  // update  momentum direction
  pPostStepPoint->SetMomentumDirection(theMomentumDirection);
 
  // update position
  pPostStepPoint->SetPosition(thePosition);
 
  // update the G4Step specific attributes
  return pStep;
}
 
// --------------------------------------------------------------------
void G4ParticleChangeForMSC::DumpInfo() const
{
  // use base-class DumpInfo
  G4VParticleChange::DumpInfo();
 
  G4int oldprc = G4cout.precision(3);
  G4cout << "        Position - x (mm)   : " << std::setw(20)
         << thePosition.x() / mm << G4endl;
  G4cout << "        Position - y (mm)   : " << std::setw(20)
         << thePosition.y() / mm << G4endl;
  G4cout << "        Position - z (mm)   : " << std::setw(20)
         << thePosition.z() / mm << G4endl;
  G4cout << "        Momentum Direct - x : " << std::setw(20)
         << theMomentumDirection.x() << G4endl;
  G4cout << "        Momentum Direct - y : " << std::setw(20)
         << theMomentumDirection.y() << G4endl;
  G4cout << "        Momentum Direct - z : " << std::setw(20)
         << theMomentumDirection.z() << G4endl;
  G4cout.precision(oldprc);
}
 
// --------------------------------------------------------------------
G4bool G4ParticleChangeForMSC::CheckIt(const G4Track& aTrack)
{
  G4bool itsOK         = true;
  G4bool exitWithError = false;
 
  G4double accuracy;
 
  // check
 
  // MomentumDirection should be unit vector
  accuracy = std::fabs(theMomentumDirection.mag2() - 1.0);
  if(accuracy > accuracyForWarning)
  {
    itsOK         = false;
    exitWithError = (accuracy > accuracyForException);
#ifdef G4VERBOSE
    G4cout << "  G4ParticleChangeForMSC::CheckIt  : ";
    G4cout << "the Momentum Change is not unit vector !!"
           << "  Difference:  " << accuracy << G4endl;
    G4cout << aTrack.GetDefinition()->GetParticleName()
           << " E=" << aTrack.GetKineticEnergy() / MeV
           << " pos=" << aTrack.GetPosition().x() / m << ", "
           << aTrack.GetPosition().y() / m << ", "
           << aTrack.GetPosition().z() / m << G4endl;
#endif
  }
 
  // dump out information of this particle change
#ifdef G4VERBOSE
  if(!itsOK) { DumpInfo(); }
#endif
 
  // exit with error
  if(exitWithError)
  {
    G4Exception("G4ParticleChangeForMSC::CheckIt()", "300", EventMustBeAborted,
                "momentum direction was illegal");
  }
  // correction
  if(!itsOK)
  {
    G4double vmag        = theMomentumDirection.mag();
    theMomentumDirection = (1. / vmag) * theMomentumDirection;
  }
 
  itsOK = (itsOK) && G4VParticleChange::CheckIt(aTrack);
  return itsOK;
}