G4Transportation Class Reference

#include <G4Transportation.hh>

Inheritance diagram for G4Transportation:

Public Member Functions
	G4Transportation (G4int verbosityLevel=1)
	~G4Transportation ()
G4double	AlongStepGetPhysicalInteractionLength (const G4Track &track, G4double previousStepSize, G4double currentMinimumStep, G4double &currentSafety, G4GPILSelection *selection)
G4VParticleChange *	AlongStepDoIt (const G4Track &track, const G4Step &stepData)
G4VParticleChange *	PostStepDoIt (const G4Track &track, const G4Step &stepData)
G4double	PostStepGetPhysicalInteractionLength (const G4Track &, G4double previousStepSize, G4ForceCondition *pForceCond)
G4PropagatorInField *	GetPropagatorInField ()
void	SetPropagatorInField (G4PropagatorInField *pFieldPropagator)
void	SetVerboseLevel (G4int verboseLevel)
G4int	GetVerboseLevel () const
G4double	GetThresholdWarningEnergy () const
G4double	GetThresholdImportantEnergy () const
G4int	GetThresholdTrials () const
void	SetThresholdWarningEnergy (G4double newEnWarn)
void	SetThresholdImportantEnergy (G4double newEnImp)
void	SetThresholdTrials (G4int newMaxTrials)
G4double	GetMaxEnergyKilled () const
G4double	GetSumEnergyKilled () const
void	ResetKilledStatistics (G4int report=1)
void	EnableShortStepOptimisation (G4bool optimise=true)
G4bool	EnableUseMagneticMoment (G4bool useMoment=true)
G4double	AtRestGetPhysicalInteractionLength (const G4Track &, G4ForceCondition *)
G4VParticleChange *	AtRestDoIt (const G4Track &, const G4Step &)
void	StartTracking (G4Track *aTrack)
Public Member Functions inherited from G4VProcess
	G4VProcess (const G4String &aName="NoName", G4ProcessType aType=fNotDefined)
	G4VProcess (const G4VProcess &right)
virtual	~G4VProcess ()
G4int	operator== (const G4VProcess &right) const
G4int	operator!= (const G4VProcess &right) const
G4double	GetCurrentInteractionLength () const
void	SetPILfactor (G4double value)
G4double	GetPILfactor () const
G4double	AlongStepGPIL (const G4Track &track, G4double previousStepSize, G4double currentMinimumStep, G4double &proposedSafety, G4GPILSelection *selection)
G4double	AtRestGPIL (const G4Track &track, G4ForceCondition *condition)
G4double	PostStepGPIL (const G4Track &track, G4double previousStepSize, G4ForceCondition *condition)
virtual G4bool	IsApplicable (const G4ParticleDefinition &)
virtual void	BuildPhysicsTable (const G4ParticleDefinition &)
virtual void	PreparePhysicsTable (const G4ParticleDefinition &)
virtual G4bool	StorePhysicsTable (const G4ParticleDefinition *, const G4String &, G4bool)
virtual G4bool	RetrievePhysicsTable (const G4ParticleDefinition *, const G4String &, G4bool)
const G4String &	GetPhysicsTableFileName (const G4ParticleDefinition *, const G4String &directory, const G4String &tableName, G4bool ascii=false)
const G4String &	GetProcessName () const
G4ProcessType	GetProcessType () const
void	SetProcessType (G4ProcessType)
G4int	GetProcessSubType () const
void	SetProcessSubType (G4int)
virtual void	EndTracking ()
virtual void	SetProcessManager (const G4ProcessManager *)
virtual const G4ProcessManager *	GetProcessManager ()
virtual void	ResetNumberOfInteractionLengthLeft ()
G4double	GetNumberOfInteractionLengthLeft () const
G4double	GetTotalNumberOfInteractionLengthTraversed () const
G4bool	isAtRestDoItIsEnabled () const
G4bool	isAlongStepDoItIsEnabled () const
G4bool	isPostStepDoItIsEnabled () const
virtual void	DumpInfo () const
void	SetVerboseLevel (G4int value)
G4int	GetVerboseLevel () const
virtual void	SetMasterProcess (G4VProcess *masterP)
const G4VProcess *	GetMasterProcess () const
virtual void	BuildWorkerPhysicsTable (const G4ParticleDefinition &part)
virtual void	PrepareWorkerPhysicsTable (const G4ParticleDefinition &)

Protected Member Functions
G4bool	DoesGlobalFieldExist ()
Protected Member Functions inherited from G4VProcess
void	SubtractNumberOfInteractionLengthLeft (G4double previousStepSize)
void	ClearNumberOfInteractionLengthLeft ()

Additional Inherited Members
Static Public Member Functions inherited from G4VProcess
static const G4String &	GetProcessTypeName (G4ProcessType)
Protected Attributes inherited from G4VProcess
const G4ProcessManager *	aProcessManager
G4VParticleChange *	pParticleChange
G4ParticleChange	aParticleChange
G4double	theNumberOfInteractionLengthLeft
G4double	currentInteractionLength
G4double	theInitialNumberOfInteractionLength
G4String	theProcessName
G4String	thePhysicsTableFileName
G4ProcessType	theProcessType
G4int	theProcessSubType
G4double	thePILfactor
G4bool	enableAtRestDoIt
G4bool	enableAlongStepDoIt
G4bool	enablePostStepDoIt
G4int	verboseLevel

Detailed Description

Definition at line 58 of file G4Transportation.hh.

Constructor & Destructor Documentation

G4Transportation::G4Transportation

(

G4int

verbosityLevel = 1

)

Definition at line 78 of file G4Transportation.cc.

References G4cout, G4endl, G4ThreadLocal, G4TransportationManager::GetNavigatorForTracking(), G4TransportationManager::GetPropagatorInField(), G4TransportationManager::GetSafetyHelper(), G4TransportationManager::GetTransportationManager(), G4VProcess::SetProcessSubType(), and TRANSPORTATION.

  : G4VProcess( G4String("Transportation"), fTransportation ),
    fTransportEndPosition( 0.0, 0.0, 0.0 ),
    fTransportEndMomentumDir( 0.0, 0.0, 0.0 ),
    fTransportEndKineticEnergy( 0.0 ),
    fTransportEndSpin( 0.0, 0.0, 0.0 ),
    fMomentumChanged(true),
    fEndGlobalTimeComputed(false), 
    fCandidateEndGlobalTime(0.0),
    fParticleIsLooping( false ),
    fGeometryLimitedStep(true),
    fPreviousSftOrigin( 0.,0.,0. ),
    fPreviousSafety( 0.0 ),
    // fParticleChange(),
    fEndPointDistance( -1.0 ), 
    fThreshold_Warning_Energy( 100 * MeV ),  
    fThreshold_Important_Energy( 250 * MeV ), 
    fThresholdTrials( 10 ), 
    fNoLooperTrials( 0 ),
    fSumEnergyKilled( 0.0 ), fMaxEnergyKilled( 0.0 ), 
    fShortStepOptimisation( false ), // Old default: true (=fast short steps)
    fUseMagneticMoment( false ),
    fVerboseLevel( verbosity )
{
  // set Process Sub Type
  SetProcessSubType(static_cast<G4int>(TRANSPORTATION));

  G4TransportationManager* transportMgr ; 

  transportMgr = G4TransportationManager::GetTransportationManager() ; 

  fLinearNavigator = transportMgr->GetNavigatorForTracking() ; 

  fFieldPropagator = transportMgr->GetPropagatorInField() ;

  fpSafetyHelper =   transportMgr->GetSafetyHelper();  // New 

  // Cannot determine whether a field exists here, as it would 
  //  depend on the relative order of creating the detector's 
  //  field and this process. That order is not guaranted.
  // Instead later the method DoesGlobalFieldExist() is called

  static G4ThreadLocal G4TouchableHandle* pNullTouchableHandle = 0;
  if ( !pNullTouchableHandle)  { pNullTouchableHandle = new G4TouchableHandle; }
  fCurrentTouchableHandle = *pNullTouchableHandle;
    // Points to (G4VTouchable*) 0

#ifdef G4VERBOSE
  if( fVerboseLevel > 0) 
  { 
     G4cout << " G4Transportation constructor> set fShortStepOptimisation to "; 
     if ( fShortStepOptimisation )  G4cout << "true"  << G4endl;
     else                           G4cout << "false" << G4endl;
  } 
#endif
}

G4Transportation::~G4Transportation

(

)

Definition at line 137 of file G4Transportation.cc.

References G4cout, and G4endl.

{
  if( (fVerboseLevel > 0) && (fSumEnergyKilled > 0.0 ) )
  { 
    G4cout << " G4Transportation: Statistics for looping particles " << G4endl;
    G4cout << "   Sum of energy of loopers killed: " <<  fSumEnergyKilled << G4endl;
    G4cout << "   Max energy of loopers killed: " <<  fMaxEnergyKilled << G4endl;
  } 
}

Member Function Documentation

G4VParticleChange * G4Transportation::AlongStepDoIt ( const G4Track &  track, const G4Step &  stepData  )

virtual

Implements G4VProcess.

Definition at line 505 of file G4Transportation.cc.

References fStopAndKill, G4cout, G4endl, G4ThreadLocal, G4Track::GetDynamicParticle(), G4Track::GetGlobalTime(), G4Track::GetKineticEnergy(), G4Track::GetLocalTime(), G4DynamicParticle::GetMass(), G4Step::GetPreStepPoint(), G4Track::GetProperTime(), G4Track::GetStepLength(), G4Track::GetTotalEnergy(), G4StepPoint::GetVelocity(), G4PropagatorInField::GimmeTrajectoryVectorAndForgetIt(), G4ParticleChangeForTransport::Initialize(), python.hepunit::MeV, G4ParticleChange::ProposeEnergy(), G4ParticleChange::ProposeGlobalTime(), G4ParticleChange::ProposeLocalTime(), G4ParticleChange::ProposeMomentumDirection(), G4ParticleChange::ProposePolarization(), G4ParticleChange::ProposePosition(), G4ParticleChange::ProposeProperTime(), G4VParticleChange::ProposeTrackStatus(), G4ParticleChangeForTransport::SetMomentumChanged(), and G4ParticleChangeForTransport::SetPointerToVectorOfAuxiliaryPoints().

{
  static G4ThreadLocal G4int noCalls=0;
  noCalls++;

  fParticleChange.Initialize(track) ;

  //  Code for specific process 
  //
  fParticleChange.ProposePosition(fTransportEndPosition) ;
  fParticleChange.ProposeMomentumDirection(fTransportEndMomentumDir) ;
  fParticleChange.ProposeEnergy(fTransportEndKineticEnergy) ;
  fParticleChange.SetMomentumChanged(fMomentumChanged) ;

  fParticleChange.ProposePolarization(fTransportEndSpin);
  
  G4double deltaTime = 0.0 ;

  // Calculate  Lab Time of Flight (ONLY if field Equations used it!)
  // G4double endTime   = fCandidateEndGlobalTime;
  // G4double delta_time = endTime - startTime;

  G4double startTime = track.GetGlobalTime() ;
  
  if (!fEndGlobalTimeComputed)
  {
     // The time was not integrated .. make the best estimate possible
     //
     G4double initialVelocity = stepData.GetPreStepPoint()->GetVelocity();
     G4double stepLength      = track.GetStepLength();

     deltaTime= 0.0;  // in case initialVelocity = 0 
     if ( initialVelocity > 0.0 )  { deltaTime = stepLength/initialVelocity; }

     fCandidateEndGlobalTime   = startTime + deltaTime ;
     fParticleChange.ProposeLocalTime(  track.GetLocalTime() + deltaTime) ;
  }
  else
  {
     deltaTime = fCandidateEndGlobalTime - startTime ;
     fParticleChange.ProposeGlobalTime( fCandidateEndGlobalTime ) ;
  }


  // Now Correct by Lorentz factor to get delta "proper" Time
  
  G4double  restMass       = track.GetDynamicParticle()->GetMass() ;
  G4double deltaProperTime = deltaTime*( restMass/track.GetTotalEnergy() ) ;

  fParticleChange.ProposeProperTime(track.GetProperTime() + deltaProperTime) ;
  //fParticleChange. ProposeTrueStepLength( track.GetStepLength() ) ;

  // If the particle is caught looping or is stuck (in very difficult
  // boundaries) in a magnetic field (doing many steps) 
  //   THEN this kills it ...
  //
  if ( fParticleIsLooping )
  {
      G4double endEnergy= fTransportEndKineticEnergy;

      if( (endEnergy < fThreshold_Important_Energy) 
          || (fNoLooperTrials >= fThresholdTrials ) )
      {
        // Kill the looping particle 
        //
        fParticleChange.ProposeTrackStatus( fStopAndKill )  ;

        // 'Bare' statistics
        fSumEnergyKilled += endEnergy; 
        if( endEnergy > fMaxEnergyKilled) { fMaxEnergyKilled= endEnergy; }

#ifdef G4VERBOSE
        if( (fVerboseLevel > 1) && 
            ( endEnergy > fThreshold_Warning_Energy )  )
        { 
          G4cout << " G4Transportation is killing track that is looping or stuck "
                 << G4endl
                 << "   This track has " << track.GetKineticEnergy() / MeV
                 << " MeV energy." << G4endl;
          G4cout << "   Number of trials = " << fNoLooperTrials 
                 << "   No of calls to AlongStepDoIt = " << noCalls 
                 << G4endl;
        }
#endif
        fNoLooperTrials=0; 
      }
      else
      {
        fNoLooperTrials ++; 
#ifdef G4VERBOSE
        if( (fVerboseLevel > 2) )
        {
          G4cout << "   G4Transportation::AlongStepDoIt(): Particle looping -  "
                 << "   Number of trials = " << fNoLooperTrials 
                 << "   No of calls to  = " << noCalls 
                 << G4endl;
        }
#endif
      }
  }
  else
  {
      fNoLooperTrials=0; 
  }

  // Another (sometimes better way) is to use a user-limit maximum Step size
  // to alleviate this problem .. 

  // Introduce smooth curved trajectories to particle-change
  //
  fParticleChange.SetPointerToVectorOfAuxiliaryPoints
    (fFieldPropagator->GimmeTrajectoryVectorAndForgetIt() );

  return &fParticleChange ;
}

G4double G4Transportation::AlongStepGetPhysicalInteractionLength ( const G4Track &  track, G4double  previousStepSize, G4double  currentMinimumStep, G4double &  currentSafety, G4GPILSelection *  selection  )

virtual

Implements G4VProcess.

Definition at line 155 of file G4Transportation.cc.

References CandidateForSelection, G4Navigator::ComputeSafety(), G4PropagatorInField::ComputeStep(), G4Navigator::ComputeStep(), G4FieldManager::ConfigureForTrack(), G4FieldManager::DoesFieldChangeEnergy(), G4PropagatorInField::FindAndSetFieldManager(), G4cerr, G4cout, G4endl, G4ThreadLocal, G4DynamicParticle::GetCharge(), G4PropagatorInField::GetChordFinder(), G4PropagatorInField::GetCurrentFieldManager(), G4DynamicParticle::GetDefinition(), G4FieldManager::GetDetectorField(), G4Track::GetDynamicParticle(), G4Track::GetGlobalTime(), G4ChordFinder::GetIntegrationDriver(), G4FieldTrack::GetKineticEnergy(), G4Track::GetKineticEnergy(), G4FieldTrack::GetLabTimeOfFlight(), G4DynamicParticle::GetMagneticMoment(), G4FieldTrack::GetMomentumDir(), G4DynamicParticle::GetMomentumDirection(), G4Track::GetMomentumDirection(), G4ParticleDefinition::GetPDGMass(), G4ParticleDefinition::GetPDGSpin(), G4Track::GetPolarization(), G4FieldTrack::GetPosition(), G4Track::GetPosition(), G4Track::GetProperTime(), G4FieldTrack::GetSpin(), G4MagInt_Driver::GetStepper(), G4DynamicParticle::GetTotalMomentum(), G4Track::GetVelocity(), G4Track::GetVolume(), G4Field::IsGravityActive(), G4PropagatorInField::IsParticleLooping(), CLHEP::Hep3Vector::mag2(), python.hepunit::MeV, python.hepunit::perMillion, python.hepunit::perThousand, G4VParticleChange::ProposeTrueStepLength(), G4EquationOfMotion::SetChargeMomentumMass(), G4SafetyHelper::SetCurrentSafety(), and sqr().

{
  G4double geometryStepLength= -1.0, newSafety= -1.0; 
  fParticleIsLooping = false ;

  // Initial actions moved to  StartTrack()   
  // --------------------------------------
  // Note: in case another process changes touchable handle
  //    it will be necessary to add here (for all steps)   
  // fCurrentTouchableHandle = aTrack->GetTouchableHandle();

  // GPILSelection is set to defaule value of CandidateForSelection
  // It is a return value
  //
  *selection = CandidateForSelection ;

  // Get initial Energy/Momentum of the track
  //
  const G4DynamicParticle*    pParticle  = track.GetDynamicParticle() ;
  const G4ParticleDefinition* pParticleDef   = pParticle->GetDefinition() ;
  G4ThreeVector startMomentumDir       = pParticle->GetMomentumDirection() ;
  G4ThreeVector startPosition          = track.GetPosition() ;

  // G4double   theTime        = track.GetGlobalTime() ;

  // The Step Point safety can be limited by other geometries and/or the 
  // assumptions of any process - it's not always the geometrical safety.
  // We calculate the starting point's isotropic safety here.
  //
  G4ThreeVector OriginShift = startPosition - fPreviousSftOrigin ;
  G4double      MagSqShift  = OriginShift.mag2() ;
  if( MagSqShift >= sqr(fPreviousSafety) )
  {
     currentSafety = 0.0 ;
  }
  else
  {
     currentSafety = fPreviousSafety - std::sqrt(MagSqShift) ;
  }

  // Is the particle charged or has it a magnetic moment?
  //
  G4double particleCharge = pParticle->GetCharge() ; 
  G4double magneticMoment = pParticle->GetMagneticMoment() ;
  G4double       restMass = pParticleDef->GetPDGMass() ;

  fGeometryLimitedStep = false ;
  // fEndGlobalTimeComputed = false ;

  // There is no need to locate the current volume. It is Done elsewhere:
  //   On track construction 
  //   By the tracking, after all AlongStepDoIts, in "Relocation"

  // Check if the particle has a force, EM or gravitational, exerted on it
  //
  G4FieldManager* fieldMgr=0;
  G4bool          fieldExertsForce = false ;

  G4bool gravityOn = false;
  G4bool fieldExists= false;  // Field is not 0 (null pointer)

  fieldMgr = fFieldPropagator->FindAndSetFieldManager( track.GetVolume() );
  if( fieldMgr != 0 )
  {
     // Message the field Manager, to configure it for this track
     fieldMgr->ConfigureForTrack( &track );
     // Is here to allow a transition from no-field pointer 
     //   to finite field (non-zero pointer).

     // If the field manager has no field ptr, the field is zero 
     //     by definition ( = there is no field ! )
     const G4Field* ptrField= fieldMgr->GetDetectorField();
     fieldExists = (ptrField!=0) ;
     if( fieldExists ) 
     {
        gravityOn= ptrField->IsGravityActive();

        if(  (particleCharge != 0.0) 
            || (fUseMagneticMoment && (magneticMoment != 0.0) )
            || (gravityOn          && (restMass != 0.0) )
          )
        {
           fieldExertsForce = fieldExists; 
        }
     }
  }
  // G4cout << " G4Transport:  field exerts force= " << fieldExertsForce
  //        << "  fieldMgr= " << fieldMgr << G4endl;
  
  if( !fieldExertsForce ) 
  {
     G4double linearStepLength ;
     if( fShortStepOptimisation && (currentMinimumStep <= currentSafety) )
     {
       // The Step is guaranteed to be taken
       //
       geometryStepLength   = currentMinimumStep ;
       fGeometryLimitedStep = false ;
     }
     else
     {
       //  Find whether the straight path intersects a volume
       //
       linearStepLength = fLinearNavigator->ComputeStep( startPosition, 
                                                         startMomentumDir,
                                                         currentMinimumStep, 
                                                         newSafety) ;
       // Remember last safety origin & value.
       //
       fPreviousSftOrigin = startPosition ;
       fPreviousSafety    = newSafety ; 
       fpSafetyHelper->SetCurrentSafety( newSafety, startPosition);

       currentSafety = newSafety ;
          
       fGeometryLimitedStep= (linearStepLength <= currentMinimumStep); 
       if( fGeometryLimitedStep )
       {
         // The geometry limits the Step size (an intersection was found.)
         geometryStepLength   = linearStepLength ;
       } 
       else
       {
         // The full Step is taken.
         geometryStepLength   = currentMinimumStep ;
       }
     }
     fEndPointDistance = geometryStepLength ;

     // Calculate final position
     //
     fTransportEndPosition = startPosition+geometryStepLength*startMomentumDir ;

     // Momentum direction, energy and polarisation are unchanged by transport
     //
     fTransportEndMomentumDir   = startMomentumDir ; 
     fTransportEndKineticEnergy = track.GetKineticEnergy() ;
     fTransportEndSpin          = track.GetPolarization();
     fParticleIsLooping         = false ;
     fMomentumChanged           = false ; 
     fEndGlobalTimeComputed     = false ;
  }
  else   //  A field exerts force
  {
     G4double       momentumMagnitude = pParticle->GetTotalMomentum() ;
     G4ThreeVector  EndUnitMomentum ;
     G4double       lengthAlongCurve ;

     G4ChargeState chargeState(particleCharge,             // The charge can change (dynamic)
                               pParticleDef->GetPDGSpin(),
                               magneticMoment); 

     G4EquationOfMotion* equationOfMotion = 
     (fFieldPropagator->GetChordFinder()->GetIntegrationDriver()->GetStepper())
     ->GetEquationOfMotion();

//     equationOfMotion->SetChargeMomentumMass( particleCharge,
     equationOfMotion->SetChargeMomentumMass( chargeState,
                                              momentumMagnitude,
                                              restMass);
      
     G4ThreeVector spin        = track.GetPolarization() ;
     G4FieldTrack  aFieldTrack = G4FieldTrack( startPosition, 
                                               track.GetMomentumDirection(),
                                               0.0, 
                                               track.GetKineticEnergy(),
                                               restMass,
                                               track.GetVelocity(),
                                               track.GetGlobalTime(), // Lab.
                                               track.GetProperTime(), // Part.
                                               &spin                  ) ;
     if( currentMinimumStep > 0 ) 
     {
        // Do the Transport in the field (non recti-linear)
        //
        lengthAlongCurve = fFieldPropagator->ComputeStep( aFieldTrack,
                                                          currentMinimumStep, 
                                                          currentSafety,
                                                          track.GetVolume() ) ;
        fGeometryLimitedStep= lengthAlongCurve < currentMinimumStep; 
        if( fGeometryLimitedStep )
        {
           geometryStepLength   = lengthAlongCurve ;
        }
        else
        {
           geometryStepLength   = currentMinimumStep ;
        }

        // Remember last safety origin & value.
        //
        fPreviousSftOrigin = startPosition ;
        fPreviousSafety    = currentSafety ;         
        fpSafetyHelper->SetCurrentSafety( currentSafety, startPosition);
     }
     else
     {
        geometryStepLength   = lengthAlongCurve= 0.0 ;
        fGeometryLimitedStep = false ;
     }
      
     // Get the End-Position and End-Momentum (Dir-ection)
     //
     fTransportEndPosition = aFieldTrack.GetPosition() ;

     // Momentum:  Magnitude and direction can be changed too now ...
     //
     fMomentumChanged         = true ; 
     fTransportEndMomentumDir = aFieldTrack.GetMomentumDir() ;

     fTransportEndKineticEnergy  = aFieldTrack.GetKineticEnergy() ; 

     if( fFieldPropagator->GetCurrentFieldManager()->DoesFieldChangeEnergy() )
     {
        // If the field can change energy, then the time must be integrated
        //    - so this should have been updated
        //
        fCandidateEndGlobalTime   = aFieldTrack.GetLabTimeOfFlight();
        fEndGlobalTimeComputed    = true;

        // was ( fCandidateEndGlobalTime != track.GetGlobalTime() );
        // a cleaner way is to have FieldTrack knowing whether time is updated.
     }
     else
     {
        // The energy should be unchanged by field transport,
        //    - so the time changed will be calculated elsewhere
        //
        fEndGlobalTimeComputed = false;

        // Check that the integration preserved the energy 
        //     -  and if not correct this!
        G4double  startEnergy= track.GetKineticEnergy();
        G4double  endEnergy= fTransportEndKineticEnergy; 

        static G4ThreadLocal G4int no_inexact_steps=0, no_large_ediff;
        G4double absEdiff = std::fabs(startEnergy- endEnergy);
        if( absEdiff > perMillion * endEnergy )
        {
          no_inexact_steps++;
          // Possible statistics keeping here ...
        }
        if( fVerboseLevel > 1 )
        {
          if( std::fabs(startEnergy- endEnergy) > perThousand * endEnergy )
          {
            static G4ThreadLocal G4int no_warnings= 0, warnModulo=1,
                                       moduloFactor= 10; 
            no_large_ediff ++;
            if( (no_large_ediff% warnModulo) == 0 )
            {
               no_warnings++;
               G4cout << "WARNING - G4Transportation::AlongStepGetPIL() " 
                      << "   Energy change in Step is above 1^-3 relative value. " << G4endl
                      << "   Relative change in 'tracking' step = " 
                      << std::setw(15) << (endEnergy-startEnergy)/startEnergy << G4endl
                      << "     Starting E= " << std::setw(12) << startEnergy / MeV << " MeV " << G4endl
                      << "     Ending   E= " << std::setw(12) << endEnergy   / MeV << " MeV " << G4endl;       
               G4cout << " Energy has been corrected -- however, review"
                      << " field propagation parameters for accuracy."  << G4endl;
               if( (fVerboseLevel > 2 ) || (no_warnings<4) || (no_large_ediff == warnModulo * moduloFactor) )
               {
                 G4cout << " These include EpsilonStepMax(/Min) in G4FieldManager "
                        << " which determine fractional error per step for integrated quantities. " << G4endl
                        << " Note also the influence of the permitted number of integration steps."
                        << G4endl;
               }
               G4cerr << "ERROR - G4Transportation::AlongStepGetPIL()" << G4endl
                      << "        Bad 'endpoint'. Energy change detected"
                      << " and corrected. " 
                      << " Has occurred already "
                      << no_large_ediff << " times." << G4endl;
               if( no_large_ediff == warnModulo * moduloFactor )
               {
                  warnModulo *= moduloFactor;
               }
            }
          }
        }  // end of if (fVerboseLevel)

        // Correct the energy for fields that conserve it
        //  This - hides the integration error
        //       - but gives a better physical answer
        fTransportEndKineticEnergy= track.GetKineticEnergy(); 
     }

     fTransportEndSpin = aFieldTrack.GetSpin();
     fParticleIsLooping = fFieldPropagator->IsParticleLooping() ;
     fEndPointDistance   = (fTransportEndPosition - startPosition).mag() ;
  }

  // If we are asked to go a step length of 0, and we are on a boundary
  // then a boundary will also limit the step -> we must flag this.
  //
  if( currentMinimumStep == 0.0 ) 
  {
      if( currentSafety == 0.0 )  { fGeometryLimitedStep = true; }
  }

  // Update the safety starting from the end-point,
  // if it will become negative at the end-point.
  //
  if( currentSafety < fEndPointDistance ) 
  {
      if( particleCharge != 0.0 ) 
      {
         G4double endSafety =
               fLinearNavigator->ComputeSafety( fTransportEndPosition) ;
         currentSafety      = endSafety ;
         fPreviousSftOrigin = fTransportEndPosition ;
         fPreviousSafety    = currentSafety ; 
         fpSafetyHelper->SetCurrentSafety( currentSafety, fTransportEndPosition);

         // Because the Stepping Manager assumes it is from the start point, 
         //  add the StepLength
         //
         currentSafety     += fEndPointDistance ;

#ifdef G4DEBUG_TRANSPORT 
         G4cout.precision(12) ;
         G4cout << "***G4Transportation::AlongStepGPIL ** " << G4endl  ;
         G4cout << "  Called Navigator->ComputeSafety at " << fTransportEndPosition
                << "    and it returned safety=  " << endSafety << G4endl ; 
         G4cout << "  Adding endpoint distance   " << fEndPointDistance  
                << "    to obtain pseudo-safety= " << currentSafety << G4endl ; 
      }
      else
      {
         G4cout << "***G4Transportation::AlongStepGPIL ** " << G4endl  ;
         G4cout << "  Avoiding call to ComputeSafety : " << G4endl;
         G4cout << "    charge     = " << particleCharge     << G4endl;
         G4cout << "    mag moment = " << magneticMoment     << G4endl;
#endif
      }
  }            

  fParticleChange.ProposeTrueStepLength(geometryStepLength) ;

  return geometryStepLength ;
}

G4VParticleChange* G4Transportation::AtRestDoIt ( const G4Track &  , const G4Step &    )

inlinevirtual

Implements G4VProcess.

Definition at line 135 of file G4Transportation.hh.

                              {return 0;};

G4double G4Transportation::AtRestGetPhysicalInteractionLength ( const G4Track &  , G4ForceCondition *    )

inlinevirtual

Implements G4VProcess.

Definition at line 129 of file G4Transportation.hh.

                              { return -1.0; };

G4bool G4Transportation::DoesGlobalFieldExist ( )

protected

Referenced by StartTracking().

void G4Transportation::EnableShortStepOptimisation ( G4bool  optimise = true )

inline

G4bool G4Transportation::EnableUseMagneticMoment ( G4bool  useMoment = true )

inline

G4double G4Transportation::GetMaxEnergyKilled ( ) const

inline

G4PropagatorInField* G4Transportation::GetPropagatorInField

(

)

G4double G4Transportation::GetSumEnergyKilled ( ) const

inline

G4double G4Transportation::GetThresholdImportantEnergy ( ) const

inline

G4int G4Transportation::GetThresholdTrials ( ) const

inline

G4double G4Transportation::GetThresholdWarningEnergy ( ) const

inline

G4int G4Transportation::GetVerboseLevel ( ) const

inline

G4VParticleChange * G4Transportation::PostStepDoIt ( const G4Track &  track, const G4Step &  stepData  )

virtual

Implements G4VProcess.

Definition at line 640 of file G4Transportation.cc.

References G4Navigator::EnteredDaughterVolume(), G4Navigator::ExitedMotherVolume(), fStopAndKill, G4cout, G4endl, G4VPhysicalVolume::GetLogicalVolume(), G4MaterialCutsCouple::GetMaterial(), G4LogicalVolume::GetMaterial(), G4ProductionCutsTable::GetMaterialCutsCouple(), G4LogicalVolume::GetMaterialCutsCouple(), G4Track::GetMomentumDirection(), G4Track::GetPosition(), G4MaterialCutsCouple::GetProductionCuts(), G4ProductionCutsTable::GetProductionCutsTable(), G4LogicalVolume::GetSensitiveDetector(), G4Track::GetTouchableHandle(), G4Track::GetTrackStatus(), G4VTouchable::GetVolume(), G4Navigator::LocateGlobalPointWithinVolume(), G4VParticleChange::ProposeLastStepInVolume(), G4VParticleChange::ProposeTrackStatus(), G4Navigator::SetGeometricallyLimitedStep(), G4ParticleChangeForTransport::SetMaterialCutsCoupleInTouchable(), G4ParticleChangeForTransport::SetMaterialInTouchable(), G4ParticleChangeForTransport::SetSensitiveDetectorInTouchable(), and G4ParticleChangeForTransport::SetTouchableHandle().

{
   G4TouchableHandle retCurrentTouchable ;   // The one to return
   G4bool isLastStep= false; 

  // Initialize ParticleChange  (by setting all its members equal
  //                             to corresponding members in G4Track)
  // fParticleChange.Initialize(track) ;  // To initialise TouchableChange

  fParticleChange.ProposeTrackStatus(track.GetTrackStatus()) ;

  // If the Step was determined by the volume boundary,
  // logically relocate the particle

  if(fGeometryLimitedStep)
  {  
    // fCurrentTouchable will now become the previous touchable, 
    // and what was the previous will be freed.
    // (Needed because the preStepPoint can point to the previous touchable)

    fLinearNavigator->SetGeometricallyLimitedStep() ;
    fLinearNavigator->
    LocateGlobalPointAndUpdateTouchableHandle( track.GetPosition(),
                                               track.GetMomentumDirection(),
                                               fCurrentTouchableHandle,
                                               true                      ) ;
    // Check whether the particle is out of the world volume 
    // If so it has exited and must be killed.
    //
    if( fCurrentTouchableHandle->GetVolume() == 0 )
    {
       fParticleChange.ProposeTrackStatus( fStopAndKill ) ;
    }
    retCurrentTouchable = fCurrentTouchableHandle ;
    fParticleChange.SetTouchableHandle( fCurrentTouchableHandle ) ;

    // Update the Step flag which identifies the Last Step in a volume
    isLastStep =  fLinearNavigator->ExitedMotherVolume() 
                       | fLinearNavigator->EnteredDaughterVolume() ;

#ifdef G4DEBUG_TRANSPORT
    //  Checking first implementation of flagging Last Step in Volume
    //
    G4bool exiting =  fLinearNavigator->ExitedMotherVolume();
    G4bool entering = fLinearNavigator->EnteredDaughterVolume();
    if( ! (exiting || entering) )
    { 
      G4cout << " Transport> :  Proposed isLastStep= " << isLastStep 
             << " Exiting "  << fLinearNavigator->ExitedMotherVolume()          
             << " Entering " << fLinearNavigator->EnteredDaughterVolume() 
             << G4endl;
    } 
#endif
  }
  else                 // fGeometryLimitedStep  is false
  {                    
    // This serves only to move the Navigator's location
    //
    fLinearNavigator->LocateGlobalPointWithinVolume( track.GetPosition() ) ;

    // The value of the track's current Touchable is retained. 
    // (and it must be correct because we must use it below to
    // overwrite the (unset) one in particle change)
    //  It must be fCurrentTouchable too ??
    //
    fParticleChange.SetTouchableHandle( track.GetTouchableHandle() ) ;
    retCurrentTouchable = track.GetTouchableHandle() ;

    isLastStep= false;

#ifdef G4DEBUG_TRANSPORT
    //  Checking first implementation of flagging Last Step in Volume
    //
    G4cout << " Transport> Proposed isLastStep= " << isLastStep
           << " Geometry did not limit step. " << G4endl;
#endif
  }         // endif ( fGeometryLimitedStep ) 

  fParticleChange.ProposeLastStepInVolume(isLastStep);    

  const G4VPhysicalVolume* pNewVol = retCurrentTouchable->GetVolume() ;
  const G4Material* pNewMaterial   = 0 ;
  const G4VSensitiveDetector* pNewSensitiveDetector   = 0 ;
                                                                                       
  if( pNewVol != 0 )
  {
    pNewMaterial= pNewVol->GetLogicalVolume()->GetMaterial();
    pNewSensitiveDetector= pNewVol->GetLogicalVolume()->GetSensitiveDetector();
  }

  // ( <const_cast> pNewMaterial ) ;
  // ( <const_cast> pNewSensitiveDetector) ;

  fParticleChange.SetMaterialInTouchable( (G4Material *) pNewMaterial ) ;
  fParticleChange.SetSensitiveDetectorInTouchable( (G4VSensitiveDetector *) pNewSensitiveDetector ) ;

  const G4MaterialCutsCouple* pNewMaterialCutsCouple = 0;
  if( pNewVol != 0 )
  {
    pNewMaterialCutsCouple=pNewVol->GetLogicalVolume()->GetMaterialCutsCouple();
  }

  if( pNewVol!=0 && pNewMaterialCutsCouple!=0 && pNewMaterialCutsCouple->GetMaterial()!=pNewMaterial )
  {
    // for parametrized volume
    //
    pNewMaterialCutsCouple =
      G4ProductionCutsTable::GetProductionCutsTable()
                             ->GetMaterialCutsCouple(pNewMaterial,
                               pNewMaterialCutsCouple->GetProductionCuts());
  }
  fParticleChange.SetMaterialCutsCoupleInTouchable( pNewMaterialCutsCouple );

  // temporarily until Get/Set Material of ParticleChange, 
  // and StepPoint can be made const. 
  // Set the touchable in ParticleChange
  // this must always be done because the particle change always
  // uses this value to overwrite the current touchable pointer.
  //
  fParticleChange.SetTouchableHandle(retCurrentTouchable) ;

  return &fParticleChange ;
}

G4double G4Transportation::PostStepGetPhysicalInteractionLength ( const G4Track &  , G4double  previousStepSize, G4ForceCondition *  pForceCond  )

virtual

Implements G4VProcess.

Definition at line 629 of file G4Transportation.cc.

References DBL_MAX, and Forced.

{ 
  *pForceCond = Forced ; 
  return DBL_MAX ;  // was kInfinity ; but convention now is DBL_MAX
}

void G4Transportation::ResetKilledStatistics ( G4int  report = 1 )

inline

void G4Transportation::SetPropagatorInField

(

G4PropagatorInField *

pFieldPropagator

)

void G4Transportation::SetThresholdImportantEnergy ( G4double  newEnImp )

inline

void G4Transportation::SetThresholdTrials ( G4int  newMaxTrials )

inline

void G4Transportation::SetThresholdWarningEnergy ( G4double  newEnWarn )

inline

void G4Transportation::SetVerboseLevel ( G4int  verboseLevel )

inline

void G4Transportation::StartTracking ( G4Track *  aTrack )

virtual

Reimplemented from G4VProcess.

Definition at line 769 of file G4Transportation.cc.

References G4FieldManagerStore::ClearAllChordFindersState(), G4PropagatorInField::ClearPropagatorState(), DoesGlobalFieldExist(), G4FieldManagerStore::GetInstance(), G4Track::GetTouchableHandle(), and G4VProcess::StartTracking().

{
  G4VProcess::StartTracking(aTrack);

  // The actions here are those that were taken in AlongStepGPIL
  //   when track.GetCurrentStepNumber()==1

  // reset safety value and center
  //
  fPreviousSafety    = 0.0 ; 
  fPreviousSftOrigin = G4ThreeVector(0.,0.,0.) ;
  
  // reset looping counter -- for motion in field
  fNoLooperTrials= 0; 
  // Must clear this state .. else it depends on last track's value
  //  --> a better solution would set this from state of suspended track TODO ? 
  // Was if( aTrack->GetCurrentStepNumber()==1 ) { .. }

  // ChordFinder reset internal state
  //
  if( DoesGlobalFieldExist() )
  {
     fFieldPropagator->ClearPropagatorState();   
       // Resets all state of field propagator class (ONLY)
       //  including safety values (in case of overlaps and to wipe for first track).

     // G4ChordFinder* chordF= fFieldPropagator->GetChordFinder();
     // if( chordF ) chordF->ResetStepEstimate();
  }

  // Make sure to clear the chord finders of all fields (ie managers)
  //
  G4FieldManagerStore* fieldMgrStore = G4FieldManagerStore::GetInstance();
  fieldMgrStore->ClearAllChordFindersState(); 

  // Update the current touchable handle  (from the track's)
  //
  fCurrentTouchableHandle = aTrack->GetTouchableHandle();
}

---

The documentation for this class was generated from the following files:

• G4Transportation.hh
• G4Transportation.cc