Gabriele Cosmo
709 lines
26 KiB
C++
709 lines
26 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 exoticphysics/monopole/src/G4MonopoleTransportation.cc
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/// \brief Implementation of the G4MonopoleTransportation class
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//
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// $Id: G4MonopoleTransportation.cc 104872 2017-06-23 14:19:16Z gcosmo $
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//
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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//
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// This class is a process responsible for the transportation of
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// magnetic monopoles, ie the geometrical propagation that encounters the
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// geometrical sub-volumes of the detectors.
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//
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// For monopoles, uses a different equation of motion and ignores energy
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// conservation.
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//
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// =======================================================================
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// Created: 3 May 2010, J. Apostolakis, B. Bozsogi
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// =======================================================================
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#include "G4MonopoleTransportation.hh"
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#include "G4ProductionCutsTable.hh"
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#include "G4ParticleTable.hh"
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#include "G4ChordFinder.hh"
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#include "G4SafetyHelper.hh"
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#include "G4FieldManagerStore.hh"
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#include "G4Monopole.hh"
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#include "G4TransportationProcessType.hh"
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#include "G4SystemOfUnits.hh"
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#include "G4RunManager.hh"
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#include "DetectorConstruction.hh"
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class G4VSensitiveDetector;
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4MonopoleTransportation::G4MonopoleTransportation( const G4Monopole* mpl,
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G4int verb)
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: G4VProcess( G4String("MonopoleTransportation"), fTransportation ),
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fParticleDef(mpl),
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fMagSetup(0),
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fLinearNavigator(0),
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fFieldPropagator(0),
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fParticleIsLooping( false ),
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fPreviousSftOrigin (0.,0.,0.),
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fPreviousSafety ( 0.0 ),
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fThreshold_Warning_Energy( 100 * MeV ),
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fThreshold_Important_Energy( 250 * MeV ),
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fThresholdTrials( 10 ),
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// fUnimportant_Energy( 1 * MeV ),
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fNoLooperTrials(0),
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fSumEnergyKilled( 0.0 ), fMaxEnergyKilled( 0.0 ),
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fShortStepOptimisation(false), // Old default: true (=fast short steps)
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fpSafetyHelper(0)
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{
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verboseLevel = verb;
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// set Process Sub Type
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SetProcessSubType(TRANSPORTATION);
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#ifdef G4MULTITHREADED
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// Do not finalize the G4MonopoleTransportation class
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if (G4Threading::IsMasterThread())
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{
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return;
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}
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#endif
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const DetectorConstruction* detector = static_cast<const DetectorConstruction*>
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(G4RunManager::GetRunManager()->GetUserDetectorConstruction());
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fMagSetup = detector->GetMonopoleFieldSetup();
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G4TransportationManager* transportMgr = G4TransportationManager::GetTransportationManager();
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fLinearNavigator = transportMgr->GetNavigatorForTracking() ;
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// fGlobalFieldMgr = transportMgr->GetFieldManager() ;
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fFieldPropagator = transportMgr->GetPropagatorInField() ;
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fpSafetyHelper = transportMgr->GetSafetyHelper();
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// New
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// Cannot determine whether a field exists here,
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// because it would only work if the field manager has informed
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// about the detector's field before this transportation process
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// is constructed.
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// Instead later the method DoesGlobalFieldExist() is called
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static G4TouchableHandle nullTouchableHandle; // Points to (G4VTouchable*) 0
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fCurrentTouchableHandle = nullTouchableHandle;
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fEndGlobalTimeComputed = false;
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fCandidateEndGlobalTime = 0;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4MonopoleTransportation::~G4MonopoleTransportation()
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{
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if( (verboseLevel > 0) && (fSumEnergyKilled > 0.0 ) ){
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G4cout << " G4MonopoleTransportation: Statistics for looping particles "
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<< G4endl;
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G4cout << " Sum of energy of loopers killed: " << fSumEnergyKilled << G4endl;
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G4cout << " Max energy of loopers killed: " << fMaxEnergyKilled << G4endl;
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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//
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// Responsibilities:
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// Find whether the geometry limits the Step, and to what length
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// Calculate the new value of the safety and return it.
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// Store the final time, position and momentum.
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G4double G4MonopoleTransportation::
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AlongStepGetPhysicalInteractionLength( const G4Track& track,
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G4double, // previousStepSize
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G4double currentMinimumStep,
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G4double& currentSafety,
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G4GPILSelection* selection )
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{
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fMagSetup->SetStepperAndChordFinder(1);
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// change to monopole equation
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G4double geometryStepLength, newSafety ;
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fParticleIsLooping = false ;
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// Initial actions moved to StartTrack()
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// --------------------------------------
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// Note: in case another process changes touchable handle
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// it will be necessary to add here (for all steps)
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// fCurrentTouchableHandle = aTrack->GetTouchableHandle();
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// GPILSelection is set to defaule value of CandidateForSelection
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// It is a return value
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//
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*selection = CandidateForSelection ;
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// Get initial Energy/Momentum of the track
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//
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const G4DynamicParticle* pParticle = track.GetDynamicParticle() ;
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G4ThreeVector startMomentumDir = pParticle->GetMomentumDirection() ;
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G4ThreeVector startPosition = track.GetPosition() ;
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// G4double theTime = track.GetGlobalTime() ;
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// The Step Point safety can be limited by other geometries and/or the
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// assumptions of any process - it's not always the geometrical safety.
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// We calculate the starting point's isotropic safety here.
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//
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G4ThreeVector OriginShift = startPosition - fPreviousSftOrigin ;
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G4double MagSqShift = OriginShift.mag2() ;
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if( MagSqShift >= sqr(fPreviousSafety) )
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{
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currentSafety = 0.0 ;
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}
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else
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{
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currentSafety = fPreviousSafety - std::sqrt(MagSqShift) ;
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}
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// Is the monopole charged ?
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//
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G4double particleMagneticCharge = fParticleDef->MagneticCharge() ;
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G4double particleElectricCharge = pParticle->GetCharge();
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fGeometryLimitedStep = false ;
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// fEndGlobalTimeComputed = false ;
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// There is no need to locate the current volume. It is Done elsewhere:
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// On track construction
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// By the tracking, after all AlongStepDoIts, in "Relocation"
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// Check whether the particle have an (EM) field force exerting upon it
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//
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G4FieldManager* fieldMgr=0;
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G4bool fieldExertsForce = false ;
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if( (particleMagneticCharge != 0.0) )
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{
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fieldMgr= fFieldPropagator->FindAndSetFieldManager( track.GetVolume() );
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if (fieldMgr != 0) {
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// Message the field Manager, to configure it for this track
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fieldMgr->ConfigureForTrack( &track );
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// Moved here, in order to allow a transition
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// from a zero-field status (with fieldMgr->(field)0
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// to a finite field status
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// If the field manager has no field, there is no field !
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fieldExertsForce = (fieldMgr->GetDetectorField() != 0);
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}
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}
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// G4cout << " G4Transport: field exerts force= " << fieldExertsForce
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// << " fieldMgr= " << fieldMgr << G4endl;
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// Choose the calculation of the transportation: Field or not
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//
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if( !fieldExertsForce )
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{
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G4double linearStepLength ;
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if( fShortStepOptimisation && (currentMinimumStep <= currentSafety) )
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{
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// The Step is guaranteed to be taken
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//
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geometryStepLength = currentMinimumStep ;
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fGeometryLimitedStep = false ;
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}
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else
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{
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// Find whether the straight path intersects a volume
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//
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linearStepLength = fLinearNavigator->ComputeStep( startPosition,
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startMomentumDir,
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currentMinimumStep,
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newSafety) ;
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// Remember last safety origin & value.
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//
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fPreviousSftOrigin = startPosition ;
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fPreviousSafety = newSafety ;
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// fpSafetyHelper->SetCurrentSafety( newSafety, startPosition);
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// The safety at the initial point has been re-calculated:
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//
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currentSafety = newSafety ;
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fGeometryLimitedStep= (linearStepLength <= currentMinimumStep);
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if( fGeometryLimitedStep )
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{
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// The geometry limits the Step size (an intersection was found.)
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geometryStepLength = linearStepLength ;
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}
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else
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{
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// The full Step is taken.
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geometryStepLength = currentMinimumStep ;
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}
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}
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endpointDistance = geometryStepLength ;
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// Calculate final position
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//
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fTransportEndPosition = startPosition+geometryStepLength*startMomentumDir ;
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// Momentum direction, energy and polarisation are unchanged by transport
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//
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fTransportEndMomentumDir = startMomentumDir ;
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fTransportEndKineticEnergy = track.GetKineticEnergy() ;
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fTransportEndSpin = track.GetPolarization();
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fParticleIsLooping = false ;
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fMomentumChanged = false ;
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fEndGlobalTimeComputed = false ;
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}
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else // A field exerts force
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{
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G4double momentumMagnitude = pParticle->GetTotalMomentum() ;
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G4ThreeVector EndUnitMomentum ;
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G4double lengthAlongCurve ;
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G4double restMass = fParticleDef->GetPDGMass() ;
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G4ChargeState chargeState(particleElectricCharge, // The charge can change (dynamic)
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fParticleDef->GetPDGSpin(),
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0, // Magnetic moment: pParticleDef->GetMagneticMoment(),
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0, // Electric Dipole moment - not in Particle Definition
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particleMagneticCharge ); // in Mev/c
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G4EquationOfMotion* equationOfMotion =
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(fFieldPropagator->GetChordFinder()->GetIntegrationDriver()->GetStepper())
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->GetEquationOfMotion();
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equationOfMotion
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->SetChargeMomentumMass( chargeState, // Was particleMagneticCharge - in Mev/c
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momentumMagnitude, // Was particleElectricCharge
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restMass ) ;
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// SetChargeMomentumMass now passes both the electric and magnetic charge - in chargeState
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G4ThreeVector spin = track.GetPolarization() ;
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G4FieldTrack aFieldTrack = G4FieldTrack( startPosition,
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track.GetMomentumDirection(),
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0.0,
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track.GetKineticEnergy(),
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restMass,
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track.GetVelocity(),
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track.GetGlobalTime(), // Lab.
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track.GetProperTime(), // Part.
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&spin ) ;
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if( currentMinimumStep > 0 )
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{
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// Do the Transport in the field (non recti-linear)
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//
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lengthAlongCurve = fFieldPropagator->ComputeStep( aFieldTrack,
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currentMinimumStep,
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currentSafety,
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track.GetVolume() ) ;
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fGeometryLimitedStep= lengthAlongCurve < currentMinimumStep;
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if( fGeometryLimitedStep ) {
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geometryStepLength = lengthAlongCurve ;
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} else {
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geometryStepLength = currentMinimumStep ;
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}
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}
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else
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{
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geometryStepLength = lengthAlongCurve= 0.0 ;
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fGeometryLimitedStep = false ;
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}
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// Remember last safety origin & value.
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//
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fPreviousSftOrigin = startPosition ;
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fPreviousSafety = currentSafety ;
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// fpSafetyHelper->SetCurrentSafety( newSafety, startPosition);
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// Get the End-Position and End-Momentum (Dir-ection)
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//
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fTransportEndPosition = aFieldTrack.GetPosition() ;
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// Momentum: Magnitude and direction can be changed too now ...
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//
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fMomentumChanged = true ;
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fTransportEndMomentumDir = aFieldTrack.GetMomentumDir() ;
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fTransportEndKineticEnergy = aFieldTrack.GetKineticEnergy() ;
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fCandidateEndGlobalTime = aFieldTrack.GetLabTimeOfFlight();
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fEndGlobalTimeComputed = true;
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fTransportEndSpin = aFieldTrack.GetSpin();
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fParticleIsLooping = fFieldPropagator->IsParticleLooping() ;
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endpointDistance = (fTransportEndPosition - startPosition).mag() ;
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}
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// If we are asked to go a step length of 0, and we are on a boundary
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// then a boundary will also limit the step -> we must flag this.
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//
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if( currentMinimumStep == 0.0 )
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{
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if( currentSafety == 0.0 ) fGeometryLimitedStep = true ;
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}
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// Update the safety starting from the end-point,
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// if it will become negative at the end-point.
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//
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if( currentSafety < endpointDistance )
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{
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// if( particleMagneticCharge == 0.0 )
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// G4cout << " Avoiding call to ComputeSafety : charge = 0.0 " << G4endl;
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if( particleMagneticCharge != 0.0 ) {
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G4double endSafety =
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fLinearNavigator->ComputeSafety( fTransportEndPosition) ;
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currentSafety = endSafety ;
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fPreviousSftOrigin = fTransportEndPosition ;
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fPreviousSafety = currentSafety ;
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fpSafetyHelper->SetCurrentSafety( currentSafety, fTransportEndPosition);
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// Because the Stepping Manager assumes it is from the start point,
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// add the StepLength
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//
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currentSafety += endpointDistance ;
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#ifdef G4DEBUG_TRANSPORT
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G4cout.precision(12) ;
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G4cout << "***G4MonopoleTransportation::AlongStepGPIL ** " << G4endl ;
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G4cout << " Called Navigator->ComputeSafety at " << fTransportEndPosition
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<< " and it returned safety= " << endSafety << G4endl ;
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G4cout << " Adding endpoint distance " << endpointDistance
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<< " to obtain pseudo-safety= " << currentSafety << G4endl ;
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#endif
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}
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}
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fParticleChange.ProposeTrueStepLength(geometryStepLength) ;
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fMagSetup->SetStepperAndChordFinder(0);
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// change back to usual equation
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return geometryStepLength ;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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//
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// Initialize ParticleChange (by setting all its members equal
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// to corresponding members in G4Track)
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G4VParticleChange* G4MonopoleTransportation::AlongStepDoIt( const G4Track& track,
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const G4Step& stepData )
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{
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static G4int noCalls=0;
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static const G4ParticleDefinition* fOpticalPhoton =
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G4ParticleTable::GetParticleTable()->FindParticle("opticalphoton");
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noCalls++;
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fParticleChange.Initialize(track) ;
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// Code for specific process
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//
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fParticleChange.ProposePosition(fTransportEndPosition) ;
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fParticleChange.ProposeMomentumDirection(fTransportEndMomentumDir) ;
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fParticleChange.ProposeEnergy(fTransportEndKineticEnergy) ;
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fParticleChange.SetMomentumChanged(fMomentumChanged) ;
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fParticleChange.ProposePolarization(fTransportEndSpin);
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G4double deltaTime = 0.0 ;
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// Calculate Lab Time of Flight (ONLY if field Equations used it!)
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// G4double endTime = fCandidateEndGlobalTime;
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// G4double delta_time = endTime - startTime;
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G4double startTime = track.GetGlobalTime() ;
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if (!fEndGlobalTimeComputed)
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{
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// The time was not integrated .. make the best estimate possible
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//
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G4double finalVelocity = track.GetVelocity() ;
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G4double initialVelocity = stepData.GetPreStepPoint()->GetVelocity() ;
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G4double stepLength = track.GetStepLength() ;
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deltaTime= 0.0; // in case initialVelocity = 0
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const G4DynamicParticle* fpDynamicParticle = track.GetDynamicParticle();
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if (fpDynamicParticle->GetDefinition()== fOpticalPhoton)
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{
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// A photon is in the medium of the final point
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// during the step, so it has the final velocity.
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deltaTime = stepLength/finalVelocity ;
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}
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else if (finalVelocity > 0.0)
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{
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G4double meanInverseVelocity ;
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// deltaTime = stepLength/finalVelocity ;
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meanInverseVelocity = 0.5
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* ( 1.0 / initialVelocity + 1.0 / finalVelocity ) ;
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deltaTime = stepLength * meanInverseVelocity ;
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}
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else if( initialVelocity > 0.0 )
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{
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deltaTime = stepLength/initialVelocity ;
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}
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fCandidateEndGlobalTime = startTime + deltaTime ;
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}
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else
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{
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deltaTime = fCandidateEndGlobalTime - startTime ;
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}
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fParticleChange.ProposeGlobalTime( fCandidateEndGlobalTime ) ;
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// Now Correct by Lorentz factor to get "proper" deltaTime
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G4double restMass = track.GetDynamicParticle()->GetMass() ;
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G4double deltaProperTime = deltaTime*( restMass/track.GetTotalEnergy() ) ;
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fParticleChange.ProposeProperTime(track.GetProperTime() + deltaProperTime) ;
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//fParticleChange. ProposeTrueStepLength( track.GetStepLength() ) ;
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// If the particle is caught looping or is stuck (in very difficult
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// boundaries) in a magnetic field (doing many steps)
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// THEN this kills it ...
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//
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if ( fParticleIsLooping )
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{
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G4double endEnergy= fTransportEndKineticEnergy;
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if( (endEnergy < fThreshold_Important_Energy)
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|| (fNoLooperTrials >= fThresholdTrials ) ){
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// Kill the looping particle
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//
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fParticleChange.ProposeTrackStatus( fStopAndKill ) ;
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// 'Bare' statistics
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fSumEnergyKilled += endEnergy;
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if( endEnergy > fMaxEnergyKilled) { fMaxEnergyKilled= endEnergy; }
|
|
|
|
#ifdef G4VERBOSE
|
|
if( (verboseLevel > 1) ||
|
|
( endEnergy > fThreshold_Warning_Energy ) ) {
|
|
G4cout << " G4MonopoleTransportation 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( (verboseLevel > 2) ){
|
|
G4cout << " G4MonopoleTransportation::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 ;
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
|
|
//
|
|
// This ensures that the PostStep action is always called,
|
|
// so that it can do the relocation if it is needed.
|
|
//
|
|
|
|
G4double G4MonopoleTransportation::
|
|
PostStepGetPhysicalInteractionLength( const G4Track&,
|
|
G4double, // previousStepSize
|
|
G4ForceCondition* pForceCond )
|
|
{
|
|
*pForceCond = Forced ;
|
|
return DBL_MAX ; // was kInfinity ; but convention now is DBL_MAX
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
|
|
|
|
G4VParticleChange* G4MonopoleTransportation::PostStepDoIt( const G4Track& track,
|
|
const G4Step& )
|
|
{
|
|
G4TouchableHandle retCurrentTouchable ; // The one to return
|
|
|
|
// 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 ) ;
|
|
}
|
|
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() ;
|
|
} // endif ( fGeometryLimitedStep )
|
|
|
|
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 ;
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
|
|
|
|
// New method takes over the responsibility to reset the state
|
|
// of G4MonopoleTransportation object at the start of a new track
|
|
// or the resumption of a suspended track.
|
|
|
|
void
|
|
G4MonopoleTransportation::StartTracking(G4Track* aTrack)
|
|
{
|
|
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)
|
|
static G4FieldManagerStore* fieldMgrStore= G4FieldManagerStore::GetInstance();
|
|
fieldMgrStore->ClearAllChordFindersState();
|
|
|
|
// Update the current touchable handle (from the track's)
|
|
//
|
|
fCurrentTouchableHandle = aTrack->GetTouchableHandle();
|
|
}
|
|
|
|
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
|
|
|