Gabriele Cosmo
193 lines
6.4 KiB
C++
193 lines
6.4 KiB
C++
// This code implementation is the intellectual property of
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// the GEANT4 collaboration.
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//
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// By copying, distributing or modifying the Program (or any work
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// based on the Program) you indicate your acceptance of this statement,
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// and all its terms.
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//
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// $Id: G4PropagatorInField.hh,v 1.5.6.1 1999/12/07 20:48:41 gunter Exp $
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// GEANT4 tag $Name: geant4-01-00 $
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//
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//
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// ------------------------------------------------------------------------
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// GEANT 4 include file implementation
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//
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// For information related to this code contact:
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// CERN, IT Division (formely CN), ASD group
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// ------------------------------------------------------------------------
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//
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// This class performs the navigation/propagation of a particle/track
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// in a magnetic field. The field is in general non-uniform.
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// For the calculation of the path, it relies on the class G4MagTr.
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//
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// class G4PropagatorInField
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// Methods:
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// ComputeStep(..)
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// CalculateStepTimeAndAccuracy(..)
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// LocateIntersectionPoint(..)
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//
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// 25.10.96 John Apostolakis, design and implementation
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// 25.03.97 John Apostolakis, adaptation for G4Transportation and cleanup
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// ------------------------------------------------------------------------
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#ifndef G4PropagatorInField_hh
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#define G4PropagatorInField_hh 1
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#include "globals.hh"
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#include "G4FieldTrack.hh"
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// #include "G4VPhysicalVolume.hh"
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// class G4VPhysicalVolume;
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#include "G4Navigator.hh"
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#include "G4ChordFinder.hh"
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#include "G4FieldManager.hh"
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// #include "G4MagIntegratorDriver.hh"
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class G4PropagatorInField {
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public:
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// To create an object, must have an object that calculates the Curved
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// paths and also must know the value of the maximum displacement allowed
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//
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G4PropagatorInField( G4Navigator *theNavigator,
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G4FieldManager *detectorFieldMgr);
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G4PropagatorInField( G4Navigator *theNavigator );
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~G4PropagatorInField(){};
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// Compute the next geometric Step
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//
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G4double ComputeStep(G4FieldTrack &pFieldTrack,
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G4double pCurrentProposedStepLength,
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G4double &pNewSafety,
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G4VPhysicalVolume *pPhysVol=0 );
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G4double ComputeStep(const G4ThreeVector &pGlobalPoint,
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const G4ThreeVector &pCurveTangent, // Unit vector
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G4double pCurrentProposedStepLength,
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G4double &pNewSafety,
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G4VPhysicalVolume *pPhysVol=0 );
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// Current Volume (to check)
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// Return the state after the Step
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//
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G4ThreeVector EndPosition();
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G4ThreeVector EndMomentumDir();
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G4bool IsParticleLooping();
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// The accuracy of finding an intersection
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//
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G4double DeltaIntersection();
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// The accuracy of a single Step
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//
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G4double DeltaOneStep();
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// The ratio DeltaOneStep()/h_current_step
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//
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G4double GetEpsilonStep(); // Relative accuracy for current Step (Calc.)
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void SetEpsilonStep(G4double newEps);
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void SetChargeMomentumMass( G4double Charge, // in e+ units
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G4double Momentum, // in Geant4 units
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G4double pMass);
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G4ChordFinder* GetChordFinder();
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// void SetChordFinder(G4ChordFinder* newCF); // Not yet relevant
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G4int SetVerboseLevel( G4int Verbose ){ return fVerboseLevel=Verbose; }
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G4int Verbose(){ return fVerboseLevel; }
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// Accuracies:
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G4double GetDeltaIntersection(); // for boundary intersection
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G4double GetDeltaOneStep(); // for one tracking/physics step
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// Sets both accuracies,
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// maintaining a particular ratio Delta Interaction / OneStep )
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void SetAccuraciesWithDeltaOneStep(G4double deltaOneStep);
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// A maximum for the number of steps that a (looping) particle can take
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G4int GetMaxLoopCount();
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void SetMaxLoopCount(G4int new_max);
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// Print Method - useful mostly for debugging this class
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//
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void printStatus(
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const G4FieldTrack& StartFT,
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const G4FieldTrack& CurrentFT,
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G4double requestStep,
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G4double safety,
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G4int Step,
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G4VPhysicalVolume* startVolume);
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// The Field Manager of the Detector
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//
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// void SetGlobalFieldMgr( G4FieldManager *detectorFieldMgr );
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G4FieldTrack GetEndState() { return End_PointAndTangent; }
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private:
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// If such an intersection exists, this function
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// calculate the intersection point of the true path of the particle
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// with the surface of the current volume (or of one of its daughters).
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// (Should use lateral displacement as measure of convergence).
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//
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G4bool LocateIntersectionPoint(
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const G4FieldTrack& CurveStartPointTangent, // A
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const G4FieldTrack& CurveEndPointTangent, // B
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const G4ThreeVector& TrialPoint, // E
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G4FieldTrack& IntersectPointTangent); // Output
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// DATA Members
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// ----------------------------------------------------------------------
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private:
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// The Field Manager of the whole Detector
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//
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G4FieldManager *fDetectorFieldMgr;
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G4Navigator *fNavigator;
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// STATE information
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// ------------------
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G4double fEpsilonStep; // Relative accuracy for current Step (Calc.)
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// End point storage:
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//
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G4FieldTrack End_PointAndTangent;
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G4bool fParticleIsLooping;
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// For debuging purposes
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G4int fVerboseLevel;
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// Values for the required accuracies
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//
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G4double fDelta_One_Step_Value; // for one tracking/physics step
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G4double fDelta_Intersection_Val; // for boundary intersection
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// Their default values ... (set in G4PropagatemagField.cc)
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//
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static const G4double fDefault_Delta_One_Step_Value; // = 0.25 * mm;
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static const G4double fDefault_Delta_Intersection_Val; // = 0.1 * mm;
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G4int fmax_loop_count;
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// Variables to keep track of "abnormal" case - which causes loop
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G4int fNoZeroStep; // Counter of zeroStep
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G4int fThresholdNo_ZeroSteps; // Threshold: above this - action
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// G4double fMidPoint_CurveLen_of_LastAttempt= -1;
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G4double fFull_CurveLen_of_LastAttempt;
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G4double fLast_ProposedStepLength;
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}; // End of class G4PropagatorInField {
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// Defines the constructor.
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//
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#include "G4PropagatorInField.icc"
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#endif
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// End of "#ifndef G4PropagatorInField_hh"
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