Gabriele Cosmo
886 lines
31 KiB
C++
886 lines
31 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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// class G4PropagatorInField Implementation
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//
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// This class implements an algorithm to track a particle in a
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// non-uniform magnetic field. It utilises an ODE solver (with
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// the Runge - Kutta method) to evolve the particle, and drives it
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// until the particle has traveled a set distance or it enters a new
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// volume.
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//
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// 14.10.96 John Apostolakis, design and implementation
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// 17.03.97 John Apostolakis, renaming new set functions being added
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// ---------------------------------------------------------------------------
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#include <iomanip>
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#include "G4PropagatorInField.hh"
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#include "G4ios.hh"
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#include "G4SystemOfUnits.hh"
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#include "G4ThreeVector.hh"
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#include "G4Material.hh"
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#include "G4VPhysicalVolume.hh"
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#include "G4Navigator.hh"
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#include "G4GeometryTolerance.hh"
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#include "G4VCurvedTrajectoryFilter.hh"
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#include "G4ChordFinder.hh"
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#include "G4MultiLevelLocator.hh"
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// ---------------------------------------------------------------------------
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// Constructors and destructor
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//
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G4PropagatorInField::G4PropagatorInField( G4Navigator* theNavigator,
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G4FieldManager* detectorFieldMgr,
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G4VIntersectionLocator* vLocator )
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: fDetectorFieldMgr(detectorFieldMgr),
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fNavigator(theNavigator),
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fCurrentFieldMgr(detectorFieldMgr),
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End_PointAndTangent(G4ThreeVector(0.,0.,0.),
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G4ThreeVector(0.,0.,0.),0.0,0.0,0.0,0.0,0.0)
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{
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fEpsilonStep = (fDetectorFieldMgr != nullptr)
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? fDetectorFieldMgr->GetMaximumEpsilonStep() : 1.0e-5;
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fPreviousSftOrigin = G4ThreeVector(0.,0.,0.);
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kCarTolerance = G4GeometryTolerance::GetInstance()->GetSurfaceTolerance();
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fZeroStepThreshold = std::max( 1.0e5 * kCarTolerance, 1.0e-1 * micrometer );
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fLargestAcceptableStep = 100.0 * meter; // Reduced from 1000.0 * meter
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fMaxStepSizeMultiplier= 0.1 ; // 0.1 in git (larger for tests.) // Reduced from 100;
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fMinBigDistance= 100. * CLHEP::mm;
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#ifdef G4DEBUG_FIELD
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G4cout << " PiF: Zero Step Threshold set to "
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<< fZeroStepThreshold / millimeter
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<< " mm." << G4endl;
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G4cout << " PiF: Value of kCarTolerance = "
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<< kCarTolerance / millimeter
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<< " mm. " << G4endl;
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fVerboseLevel = 2;
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fVerbTracePiF = true;
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#endif
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// Defining Intersection Locator and his parameters
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if ( vLocator == nullptr )
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{
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fIntersectionLocator = new G4MultiLevelLocator(theNavigator);
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fAllocatedLocator = true;
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}
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else
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{
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fIntersectionLocator = vLocator;
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fAllocatedLocator = false;
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}
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RefreshIntersectionLocator(); // Copy all relevant parameters
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}
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// ---------------------------------------------------------------------------
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//
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G4PropagatorInField::~G4PropagatorInField()
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{
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if(fAllocatedLocator) { delete fIntersectionLocator; }
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}
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// ---------------------------------------------------------------------------
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// Update the IntersectionLocator with current parameters
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//
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void G4PropagatorInField::RefreshIntersectionLocator()
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{
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fIntersectionLocator->SetEpsilonStepFor(fEpsilonStep);
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fIntersectionLocator->SetDeltaIntersectionFor(fCurrentFieldMgr->GetDeltaIntersection());
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fIntersectionLocator->SetChordFinderFor(GetChordFinder());
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fIntersectionLocator->SetSafetyParametersFor( fUseSafetyForOptimisation);
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}
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// ---------------------------------------------------------------------------
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// Compute the next geometric Step
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//
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G4double G4PropagatorInField::ComputeStep(
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G4FieldTrack& pFieldTrack,
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G4double CurrentProposedStepLength,
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G4double& currentSafety, // IN/OUT
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G4VPhysicalVolume* pPhysVol,
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G4bool canRelaxDeltaChord)
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{
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GetChordFinder()->OnComputeStep(&pFieldTrack);
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const G4double deltaChord = GetChordFinder()->GetDeltaChord();
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// If CurrentProposedStepLength is too small for finding Chords
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// then return with no action (for now - TODO: some action)
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//
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const char* methodName = "G4PropagatorInField::ComputeStep";
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if (CurrentProposedStepLength<kCarTolerance)
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{
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return kInfinity;
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}
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// Introducing smooth trajectory display (jacek 01/11/2002)
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//
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if (fpTrajectoryFilter != nullptr)
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{
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fpTrajectoryFilter->CreateNewTrajectorySegment();
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}
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fFirstStepInVolume = fNewTrack ? true : fLastStepInVolume;
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fLastStepInVolume = false;
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fNewTrack = false;
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if( fVerboseLevel > 2 )
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{
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G4cout << methodName << " called" << G4endl;
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G4cout << " Starting FT: " << pFieldTrack;
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G4cout << " Requested length = " << CurrentProposedStepLength << G4endl;
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G4cout << " PhysVol = ";
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if( pPhysVol != nullptr )
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{
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G4cout << pPhysVol->GetName() << G4endl;
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}
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else
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{
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G4cout << " N/A ";
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}
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G4cout << G4endl;
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}
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// Parameters for adaptive Runge-Kutta integration
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G4double h_TrialStepSize; // 1st Step Size
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G4double TruePathLength = CurrentProposedStepLength;
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G4double StepTaken = 0.0;
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G4double s_length_taken, epsilon;
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G4bool intersects;
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G4bool first_substep = true;
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G4double NewSafety;
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fParticleIsLooping = false;
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// If not yet done,
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// Set the field manager to the local one if the volume has one,
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// or to the global one if not
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//
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if( !fSetFieldMgr )
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{
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fCurrentFieldMgr = FindAndSetFieldManager( pPhysVol );
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}
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fSetFieldMgr = false; // For next call, the field manager must be set again
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G4FieldTrack CurrentState(pFieldTrack);
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G4FieldTrack OriginalState = CurrentState;
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// If the Step length is "infinite", then an approximate-maximum Step
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// length (used to calculate the relative accuracy) must be guessed
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//
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if( CurrentProposedStepLength >= fLargestAcceptableStep )
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{
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G4ThreeVector StartPointA, VelocityUnit;
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StartPointA = pFieldTrack.GetPosition();
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VelocityUnit = pFieldTrack.GetMomentumDir();
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G4double trialProposedStep = fMaxStepSizeMultiplier * ( fMinBigDistance +
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fNavigator->GetWorldVolume()->GetLogicalVolume()->
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GetSolid()->DistanceToOut(StartPointA, VelocityUnit) );
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CurrentProposedStepLength = std::min( trialProposedStep,
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fLargestAcceptableStep );
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}
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epsilon = fCurrentFieldMgr->GetDeltaOneStep() / CurrentProposedStepLength;
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G4double epsilonMin= fCurrentFieldMgr->GetMinimumEpsilonStep();
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G4double epsilonMax= fCurrentFieldMgr->GetMaximumEpsilonStep();
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if( epsilon < epsilonMin ) { epsilon = epsilonMin; }
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if( epsilon > epsilonMax ) { epsilon = epsilonMax; }
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SetEpsilonStep( epsilon );
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// Values for Intersection Locator has to be updated on each call for the
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// case that CurrentFieldManager has changed from the one of previous step
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//
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RefreshIntersectionLocator();
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// Shorten the proposed step in case of earlier problems (zero steps)
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//
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if( fNoZeroStep > fActionThreshold_NoZeroSteps )
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{
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G4double stepTrial;
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stepTrial = fFull_CurveLen_of_LastAttempt;
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if( (stepTrial <= 0.0) && (fLast_ProposedStepLength > 0.0) )
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{
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stepTrial = fLast_ProposedStepLength;
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}
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G4double decreaseFactor = 0.9; // Unused default
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if( (fNoZeroStep < fSevereActionThreshold_NoZeroSteps)
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&& (stepTrial > 100.0*fZeroStepThreshold) )
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{
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// Attempt quick convergence
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//
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decreaseFactor= 0.25;
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}
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else
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{
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// We are in significant difficulties, probably at a boundary that
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// is either geometrically sharp or between very different materials.
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// Careful decreases to cope with tolerance are required
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//
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if( stepTrial > 100.0*fZeroStepThreshold ) {
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decreaseFactor = 0.35; // Try decreasing slower
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} else if( stepTrial > 30.0*fZeroStepThreshold ) {
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decreaseFactor= 0.5; // Try yet slower decrease
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} else if( stepTrial > 10.0*fZeroStepThreshold ) {
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decreaseFactor= 0.75; // Try even slower decreases
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} else {
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decreaseFactor= 0.9; // Try very slow decreases
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}
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}
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stepTrial *= decreaseFactor;
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#ifdef G4DEBUG_FIELD
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if( fVerboseLevel > 2
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|| (fNoZeroStep >= fSevereActionThreshold_NoZeroSteps) )
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{
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G4cerr << " " << methodName
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<< " Decreasing step after " << fNoZeroStep << " zero steps "
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<< " - in volume " << pPhysVol;
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if( pPhysVol )
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G4cerr << " with name " << pPhysVol->GetName();
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else
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G4cerr << " i.e. *unknown* volume.";
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G4cerr << G4endl;
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PrintStepLengthDiagnostic(CurrentProposedStepLength, decreaseFactor,
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stepTrial, pFieldTrack);
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}
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#endif
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if( stepTrial == 0.0 ) // Change to make it < 0.1 * kCarTolerance ??
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{
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std::ostringstream message;
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message << "Particle abandoned due to lack of progress in field."
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<< G4endl
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<< " Properties : " << pFieldTrack << G4endl
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<< " Attempting a zero step = " << stepTrial << G4endl
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<< " while attempting to progress after " << fNoZeroStep
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<< " trial steps. Will abandon step.";
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G4Exception(methodName, "GeomNav1002", JustWarning, message);
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fParticleIsLooping = true;
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return 0; // = stepTrial;
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}
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if( stepTrial < CurrentProposedStepLength )
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{
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CurrentProposedStepLength = stepTrial;
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}
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}
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fLast_ProposedStepLength = CurrentProposedStepLength;
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G4int do_loop_count = 0;
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do // Loop checking, 07.10.2016, JA
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{
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G4FieldTrack SubStepStartState = CurrentState;
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G4ThreeVector SubStartPoint = CurrentState.GetPosition();
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if(!first_substep)
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{
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if( fVerboseLevel > 4 )
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{
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G4cout << " PiF: Calling Nav/Locate Global Point within-Volume "
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<< G4endl;
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}
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fNavigator->LocateGlobalPointWithinVolume( SubStartPoint );
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}
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// How far to attempt to move the particle !
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//
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h_TrialStepSize = CurrentProposedStepLength - StepTaken;
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if (canRelaxDeltaChord &&
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fIncreaseChordDistanceThreshold > 0 &&
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do_loop_count > fIncreaseChordDistanceThreshold &&
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do_loop_count % fIncreaseChordDistanceThreshold == 0)
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{
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GetChordFinder()->SetDeltaChord(
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GetChordFinder()->GetDeltaChord() * 2.0
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);
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}
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// Integrate as far as "chord miss" rule allows.
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//
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s_length_taken = GetChordFinder()->AdvanceChordLimited(
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CurrentState, // Position & velocity
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h_TrialStepSize,
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fEpsilonStep,
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fPreviousSftOrigin,
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fPreviousSafety );
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// CurrentState is now updated with the final position and velocity
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fFull_CurveLen_of_LastAttempt = s_length_taken;
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G4ThreeVector EndPointB = CurrentState.GetPosition();
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G4ThreeVector InterSectionPointE;
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G4double LinearStepLength;
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// Intersect chord AB with geometry
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//
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intersects= IntersectChord( SubStartPoint, EndPointB,
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NewSafety, LinearStepLength,
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InterSectionPointE );
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// E <- Intersection Point of chord AB and either volume A's surface
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// or a daughter volume's surface ..
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if( first_substep )
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{
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currentSafety = NewSafety;
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} // Updating safety in other steps is potential future extention
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if( intersects )
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{
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G4FieldTrack IntersectPointVelct_G(CurrentState); // FT-Def-Construct
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// Find the intersection point of AB true path with the surface
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// of vol(A), if it exists. Start with point E as first "estimate".
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G4bool recalculatedEndPt = false;
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G4bool found_intersection = fIntersectionLocator->
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EstimateIntersectionPoint( SubStepStartState, CurrentState,
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InterSectionPointE, IntersectPointVelct_G,
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recalculatedEndPt, fPreviousSafety,
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fPreviousSftOrigin);
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intersects = found_intersection;
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if( found_intersection )
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{
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End_PointAndTangent= IntersectPointVelct_G; // G is our EndPoint ...
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StepTaken = TruePathLength = IntersectPointVelct_G.GetCurveLength()
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- OriginalState.GetCurveLength();
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}
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else
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{
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// Either "minor" chords do not intersect
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// or else stopped (due to too many steps)
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//
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if( recalculatedEndPt )
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{
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G4double endAchieved = IntersectPointVelct_G.GetCurveLength();
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G4double endExpected = CurrentState.GetCurveLength();
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// Detect failure - due to too many steps
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G4bool shortEnd = endAchieved
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< (endExpected*(1.0-CLHEP::perMillion));
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G4double stepAchieved = endAchieved
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- SubStepStartState.GetCurveLength();
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// Update remaining state - must work for 'full' step or
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// abandonned intersection
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//
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CurrentState = IntersectPointVelct_G;
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s_length_taken = stepAchieved;
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if( shortEnd )
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{
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fParticleIsLooping = true;
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}
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}
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}
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}
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if( !intersects )
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{
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StepTaken += s_length_taken;
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if (fpTrajectoryFilter != nullptr) // For smooth trajectory display (jacek 1/11/2002)
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{
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fpTrajectoryFilter->TakeIntermediatePoint(CurrentState.GetPosition());
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}
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}
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first_substep = false;
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#ifdef G4DEBUG_FIELD
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if( fNoZeroStep > fActionThreshold_NoZeroSteps )
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{
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if( fNoZeroStep > fSevereActionThreshold_NoZeroSteps )
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G4cout << " Above 'Severe Action' threshold -- for Zero steps. ";
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else
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G4cout << " Above 'action' threshold -- for Zero steps. ";
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G4cout << " Number of zero steps = " << fNoZeroStep << G4endl;
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printStatus( SubStepStartState, // or OriginalState,
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CurrentState, CurrentProposedStepLength,
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NewSafety, do_loop_count, pPhysVol );
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}
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if( (fVerboseLevel > 1) && (do_loop_count > fMax_loop_count-10 ))
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{
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if( do_loop_count == fMax_loop_count-9 )
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{
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G4cout << " G4PropagatorInField::ComputeStep(): " << G4endl
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<< " Difficult track - taking many sub steps." << G4endl;
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printStatus( SubStepStartState, SubStepStartState, CurrentProposedStepLength,
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NewSafety, 0, pPhysVol );
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}
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printStatus( SubStepStartState, CurrentState, CurrentProposedStepLength,
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NewSafety, do_loop_count, pPhysVol );
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}
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#endif
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++do_loop_count;
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} while( (!intersects )
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&& (!fParticleIsLooping)
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&& (StepTaken + kCarTolerance < CurrentProposedStepLength)
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&& ( do_loop_count < fMax_loop_count ) );
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if( do_loop_count >= fMax_loop_count
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&& (StepTaken + kCarTolerance < CurrentProposedStepLength) )
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{
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fParticleIsLooping = true;
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}
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if ( ( fParticleIsLooping ) && (fVerboseLevel > 0) )
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{
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ReportLoopingParticle( do_loop_count, StepTaken,
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CurrentProposedStepLength, methodName,
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CurrentState.GetMomentum(), pPhysVol );
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}
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if( !intersects )
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{
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// Chord AB or "minor chords" do not intersect
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// B is the endpoint Step of the current Step.
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//
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End_PointAndTangent = CurrentState;
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TruePathLength = StepTaken; // Original code
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// Tried the following to avoid potential issue with round-off error
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// - but has issues... Suppressing this change JA 2015/05/02
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// TruePathLength = CurrentProposedStepLength;
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}
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fLastStepInVolume = intersects;
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// Set pFieldTrack to the return value
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//
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pFieldTrack = End_PointAndTangent;
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#ifdef G4VERBOSE
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// Check that "s" is correct
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//
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if( std::fabs(OriginalState.GetCurveLength() + TruePathLength
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- End_PointAndTangent.GetCurveLength()) > 3.e-4 * TruePathLength )
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{
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std::ostringstream message;
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message << "Curve length mis-match between original state "
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<< "and proposed endpoint of propagation." << G4endl
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<< " The curve length of the endpoint should be: "
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<< OriginalState.GetCurveLength() + TruePathLength << G4endl
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<< " and it is instead: "
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<< End_PointAndTangent.GetCurveLength() << "." << G4endl
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<< " A difference of: "
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<< OriginalState.GetCurveLength() + TruePathLength
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- End_PointAndTangent.GetCurveLength() << G4endl
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<< " Original state = " << OriginalState << G4endl
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<< " Proposed state = " << End_PointAndTangent;
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G4Exception(methodName, "GeomNav0003", FatalException, message);
|
|
}
|
|
#endif
|
|
|
|
if( TruePathLength+kCarTolerance >= CurrentProposedStepLength )
|
|
{
|
|
fNoZeroStep = 0;
|
|
}
|
|
else
|
|
{
|
|
// In particular anomalous cases, we can get repeated zero steps
|
|
// We identify these cases and take corrective action when they occur.
|
|
//
|
|
if( TruePathLength < std::max( fZeroStepThreshold, 0.5*kCarTolerance ) )
|
|
{
|
|
++fNoZeroStep;
|
|
}
|
|
else
|
|
{
|
|
fNoZeroStep = 0;
|
|
}
|
|
}
|
|
if( fNoZeroStep > fAbandonThreshold_NoZeroSteps )
|
|
{
|
|
fParticleIsLooping = true;
|
|
ReportStuckParticle( fNoZeroStep, CurrentProposedStepLength,
|
|
fFull_CurveLen_of_LastAttempt, pPhysVol );
|
|
fNoZeroStep = 0;
|
|
}
|
|
|
|
GetChordFinder()->SetDeltaChord(deltaChord);
|
|
return TruePathLength;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// Dumps status of propagator
|
|
//
|
|
void
|
|
G4PropagatorInField::printStatus( const G4FieldTrack& StartFT,
|
|
const G4FieldTrack& CurrentFT,
|
|
G4double requestStep,
|
|
G4double safety,
|
|
G4int stepNo,
|
|
G4VPhysicalVolume* startVolume)
|
|
{
|
|
const G4int verboseLevel = fVerboseLevel;
|
|
const G4ThreeVector StartPosition = StartFT.GetPosition();
|
|
const G4ThreeVector StartUnitVelocity = StartFT.GetMomentumDir();
|
|
const G4ThreeVector CurrentPosition = CurrentFT.GetPosition();
|
|
const G4ThreeVector CurrentUnitVelocity = CurrentFT.GetMomentumDir();
|
|
|
|
G4double step_len = CurrentFT.GetCurveLength() - StartFT.GetCurveLength();
|
|
|
|
G4long oldprec; // cout/cerr precision settings
|
|
|
|
if( ((stepNo == 0) && (verboseLevel <3)) || (verboseLevel >= 3) )
|
|
{
|
|
oldprec = G4cout.precision(4);
|
|
G4cout << std::setw( 5) << "Step#"
|
|
<< std::setw(10) << " s " << " "
|
|
<< std::setw(10) << "X(mm)" << " "
|
|
<< std::setw(10) << "Y(mm)" << " "
|
|
<< std::setw(10) << "Z(mm)" << " "
|
|
<< std::setw( 7) << " N_x " << " "
|
|
<< std::setw( 7) << " N_y " << " "
|
|
<< std::setw( 7) << " N_z " << " " ;
|
|
G4cout << std::setw( 7) << " Delta|N|" << " "
|
|
<< std::setw( 9) << "StepLen" << " "
|
|
<< std::setw(12) << "StartSafety" << " "
|
|
<< std::setw( 9) << "PhsStep" << " ";
|
|
if( startVolume != nullptr )
|
|
{ G4cout << std::setw(18) << "NextVolume" << " "; }
|
|
G4cout.precision(oldprec);
|
|
G4cout << G4endl;
|
|
}
|
|
if((stepNo == 0) && (verboseLevel <=3))
|
|
{
|
|
// Recurse to print the start values
|
|
//
|
|
printStatus( StartFT, StartFT, -1.0, safety, -1, startVolume);
|
|
}
|
|
if( verboseLevel <= 3 )
|
|
{
|
|
if( stepNo >= 0)
|
|
{ G4cout << std::setw( 4) << stepNo << " "; }
|
|
else
|
|
{ G4cout << std::setw( 5) << "Start" ; }
|
|
oldprec = G4cout.precision(8);
|
|
G4cout << std::setw(10) << CurrentFT.GetCurveLength() << " ";
|
|
G4cout.precision(8);
|
|
G4cout << std::setw(10) << CurrentPosition.x() << " "
|
|
<< std::setw(10) << CurrentPosition.y() << " "
|
|
<< std::setw(10) << CurrentPosition.z() << " ";
|
|
G4cout.precision(4);
|
|
G4cout << std::setw( 7) << CurrentUnitVelocity.x() << " "
|
|
<< std::setw( 7) << CurrentUnitVelocity.y() << " "
|
|
<< std::setw( 7) << CurrentUnitVelocity.z() << " ";
|
|
G4cout.precision(3);
|
|
G4cout << std::setw( 7)
|
|
<< CurrentFT.GetMomentum().mag()-StartFT.GetMomentum().mag() << " ";
|
|
G4cout << std::setw( 9) << step_len << " ";
|
|
G4cout << std::setw(12) << safety << " ";
|
|
if( requestStep != -1.0 )
|
|
{ G4cout << std::setw( 9) << requestStep << " "; }
|
|
else
|
|
{ G4cout << std::setw( 9) << "Init/NotKnown" << " "; }
|
|
if( startVolume != nullptr)
|
|
{ G4cout << std::setw(12) << startVolume->GetName() << " "; }
|
|
G4cout.precision(oldprec);
|
|
G4cout << G4endl;
|
|
}
|
|
else // if( verboseLevel > 3 )
|
|
{
|
|
// Multi-line output
|
|
|
|
G4cout << "Step taken was " << step_len
|
|
<< " out of PhysicalStep = " << requestStep << G4endl;
|
|
G4cout << "Final safety is: " << safety << G4endl;
|
|
G4cout << "Chord length = " << (CurrentPosition-StartPosition).mag()
|
|
<< G4endl;
|
|
G4cout << G4endl;
|
|
}
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// Prints Step diagnostics
|
|
//
|
|
void
|
|
G4PropagatorInField::PrintStepLengthDiagnostic(
|
|
G4double CurrentProposedStepLength,
|
|
G4double decreaseFactor,
|
|
G4double stepTrial,
|
|
const G4FieldTrack& )
|
|
{
|
|
G4long iprec= G4cout.precision(8);
|
|
G4cout << " " << std::setw(12) << " PiF: NoZeroStep "
|
|
<< " " << std::setw(20) << " CurrentProposed len "
|
|
<< " " << std::setw(18) << " Full_curvelen_last"
|
|
<< " " << std::setw(18) << " last proposed len "
|
|
<< " " << std::setw(18) << " decrease factor "
|
|
<< " " << std::setw(15) << " step trial "
|
|
<< G4endl;
|
|
|
|
G4cout << " " << std::setw(10) << fNoZeroStep << " "
|
|
<< " " << std::setw(20) << CurrentProposedStepLength
|
|
<< " " << std::setw(18) << fFull_CurveLen_of_LastAttempt
|
|
<< " " << std::setw(18) << fLast_ProposedStepLength
|
|
<< " " << std::setw(18) << decreaseFactor
|
|
<< " " << std::setw(15) << stepTrial
|
|
<< G4endl;
|
|
G4cout.precision( iprec );
|
|
}
|
|
|
|
// Access the points which have passed through the filter. The
|
|
// points are stored as ThreeVectors for the initial impelmentation
|
|
// only (jacek 30/10/2002)
|
|
// Responsibility for deleting the points lies with
|
|
// SmoothTrajectoryPoint, which is the points' final
|
|
// destination. The points pointer is set to NULL, to ensure that
|
|
// the points are not re-used in subsequent steps, therefore THIS
|
|
// METHOD MUST BE CALLED EXACTLY ONCE PER STEP. (jacek 08/11/2002)
|
|
|
|
std::vector<G4ThreeVector>*
|
|
G4PropagatorInField::GimmeTrajectoryVectorAndForgetIt() const
|
|
{
|
|
// NB, GimmeThePointsAndForgetThem really forgets them, so it can
|
|
// only be called (exactly) once for each step.
|
|
|
|
if (fpTrajectoryFilter != nullptr)
|
|
{
|
|
return fpTrajectoryFilter->GimmeThePointsAndForgetThem();
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
//
|
|
void
|
|
G4PropagatorInField::SetTrajectoryFilter(G4VCurvedTrajectoryFilter* filter)
|
|
{
|
|
fpTrajectoryFilter = filter;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
//
|
|
void G4PropagatorInField::ClearPropagatorState()
|
|
{
|
|
// Goal: Clear all memory of previous steps, cached information
|
|
|
|
fParticleIsLooping = false;
|
|
fNoZeroStep = 0;
|
|
|
|
fSetFieldMgr = false; // Has field-manager been set for the current step?
|
|
fEpsilonStep= 1.0e-5; // Relative accuracy of current Step
|
|
|
|
End_PointAndTangent= G4FieldTrack( G4ThreeVector(0.,0.,0.),
|
|
G4ThreeVector(0.,0.,0.),
|
|
0.0,0.0,0.0,0.0,0.0);
|
|
fFull_CurveLen_of_LastAttempt = -1;
|
|
fLast_ProposedStepLength = -1;
|
|
|
|
fPreviousSftOrigin= G4ThreeVector(0.,0.,0.);
|
|
fPreviousSafety= 0.0;
|
|
|
|
fNewTrack = true;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
//
|
|
G4FieldManager* G4PropagatorInField::
|
|
FindAndSetFieldManager( G4VPhysicalVolume* pCurrentPhysicalVolume )
|
|
{
|
|
G4FieldManager* currentFieldMgr;
|
|
|
|
currentFieldMgr = fDetectorFieldMgr;
|
|
if( pCurrentPhysicalVolume != nullptr )
|
|
{
|
|
G4FieldManager *pRegionFieldMgr = nullptr, *localFieldMgr = nullptr;
|
|
G4LogicalVolume* pLogicalVol = pCurrentPhysicalVolume->GetLogicalVolume();
|
|
|
|
if( pLogicalVol != nullptr )
|
|
{
|
|
// Value for Region, if any, overrides
|
|
//
|
|
G4Region* pRegion = pLogicalVol->GetRegion();
|
|
if( pRegion != nullptr )
|
|
{
|
|
pRegionFieldMgr = pRegion->GetFieldManager();
|
|
if( pRegionFieldMgr != nullptr )
|
|
{
|
|
currentFieldMgr= pRegionFieldMgr;
|
|
}
|
|
}
|
|
|
|
// 'Local' Value from logical volume, if any, overrides
|
|
//
|
|
localFieldMgr = pLogicalVol->GetFieldManager();
|
|
if ( localFieldMgr != nullptr )
|
|
{
|
|
currentFieldMgr = localFieldMgr;
|
|
}
|
|
}
|
|
}
|
|
fCurrentFieldMgr = currentFieldMgr;
|
|
|
|
// Flag that field manager has been set
|
|
//
|
|
fSetFieldMgr = true;
|
|
|
|
return currentFieldMgr;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
//
|
|
G4int G4PropagatorInField::SetVerboseLevel( G4int level )
|
|
{
|
|
G4int oldval = fVerboseLevel;
|
|
fVerboseLevel = level;
|
|
|
|
// Forward the verbose level 'reduced' to ChordFinder,
|
|
// MagIntegratorDriver ... ?
|
|
//
|
|
auto integrDriver = GetChordFinder()->GetIntegrationDriver();
|
|
integrDriver->SetVerboseLevel( fVerboseLevel - 2 );
|
|
G4cout << "Set Driver verbosity to " << fVerboseLevel - 2 << G4endl;
|
|
|
|
return oldval;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
//
|
|
void G4PropagatorInField::ReportLoopingParticle( G4int count,
|
|
G4double StepTaken,
|
|
G4double StepRequested,
|
|
const char* methodName,
|
|
const G4ThreeVector& momentumVec,
|
|
G4VPhysicalVolume* pPhysVol )
|
|
{
|
|
std::ostringstream message;
|
|
G4double fraction = StepTaken / StepRequested;
|
|
message << " Unfinished integration of track (likely looping particle) "
|
|
<< " of momentum " << momentumVec << " ( magnitude = "
|
|
<< momentumVec.mag() << " ) " << G4endl
|
|
<< " after " << count << " field substeps "
|
|
<< " totaling " << std::setprecision(12) << StepTaken / mm << " mm "
|
|
<< " out of requested step " << std::setprecision(12)
|
|
<< StepRequested / mm << " mm ";
|
|
message << " a fraction of ";
|
|
G4int prec = 4;
|
|
if( fraction > 0.99 )
|
|
{
|
|
prec = 7;
|
|
}
|
|
else
|
|
{
|
|
if (fraction > 0.97 ) { prec = 5; }
|
|
}
|
|
message << std::setprecision(prec)
|
|
<< 100. * StepTaken / StepRequested << " % " << G4endl ;
|
|
if( pPhysVol != nullptr )
|
|
{
|
|
message << " in volume " << pPhysVol->GetName() ;
|
|
auto material = pPhysVol->GetLogicalVolume()->GetMaterial();
|
|
if( material != nullptr )
|
|
{
|
|
message << " with material " << material->GetName()
|
|
<< " ( density = "
|
|
<< material->GetDensity() / ( g/(cm*cm*cm) ) << " g / cm^3 ) ";
|
|
}
|
|
}
|
|
else
|
|
{
|
|
message << " in unknown (null) volume. " ;
|
|
}
|
|
G4Exception(methodName, "GeomNav1002", JustWarning, message);
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
//
|
|
void G4PropagatorInField::ReportStuckParticle( G4int noZeroSteps,
|
|
G4double proposedStep,
|
|
G4double lastTriedStep,
|
|
G4VPhysicalVolume* physVol )
|
|
{
|
|
std::ostringstream message;
|
|
message << "Particle is stuck; it will be killed." << G4endl
|
|
<< " Zero progress for " << noZeroSteps << " attempted steps."
|
|
<< G4endl
|
|
<< " Proposed Step is " << proposedStep
|
|
<< " but Step Taken is "<< lastTriedStep << G4endl;
|
|
if( physVol != nullptr )
|
|
{
|
|
message << " in volume " << physVol->GetName() ;
|
|
}
|
|
else
|
|
{
|
|
message << " in unknown or null volume. " ;
|
|
}
|
|
G4Exception("G4PropagatorInField::ComputeStep()",
|
|
"GeomNav1002", JustWarning, message);
|
|
}
|
|
|
|
// ------------------------------------------------------------------------
|
|
|
|
// ----------------------------------------------
|
|
// Methods to alter Parameters
|
|
// ----------------------------------------------
|
|
|
|
// Was a data member (of an object) -- now moved to class member
|
|
G4double G4PropagatorInField::GetLargestAcceptableStep()
|
|
{
|
|
return fLargestAcceptableStep;
|
|
}
|
|
|
|
// ------------------------------------------------------------------------
|
|
//
|
|
void G4PropagatorInField::SetLargestAcceptableStep( G4double newBigDist )
|
|
{
|
|
if( fLargestAcceptableStep>0.0 )
|
|
{
|
|
fLargestAcceptableStep = newBigDist;
|
|
}
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
|
|
G4double G4PropagatorInField::GetMaxStepSizeMultiplier()
|
|
{
|
|
return fMaxStepSizeMultiplier;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
|
|
void G4PropagatorInField::SetMaxStepSizeMultiplier(G4double vm)
|
|
{
|
|
fMaxStepSizeMultiplier=vm;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
|
|
G4double G4PropagatorInField::GetMinBigDistance()
|
|
{
|
|
return fMinBigDistance;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
|
|
void G4PropagatorInField::SetMinBigDistance(G4double val)
|
|
{
|
|
fMinBigDistance= val;
|
|
}
|