Gabriele Cosmo
94 lines
2.7 KiB
C++
94 lines
2.7 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: G4MagHelicalStepper.hh,v 1.5 2000/11/01 15:15:49 gcosmo Exp $
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// GEANT4 tag $Name: geant4-03-00 $
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//
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//
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// class G4MagHelicalStepper
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//
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// Class description:
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//
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// Abstract base class for integrator of particle's equation of motion,
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// used in tracking in space dependent magnetic field
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// History:
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// - 05.11.98 J.Apostolakis Creation of new ABC
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#ifndef G4MagHelicalStepper_hh
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#define G4MagHelicalStepper_hh
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#include "globals.hh"
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#include "G4MagIntegratorStepper.hh"
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#include "G4Mag_EqRhs.hh"
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#include "G4ThreeVector.hh"
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class G4MagHelicalStepper : public G4MagIntegratorStepper
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{
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public: // with description
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G4MagHelicalStepper(G4Mag_EqRhs *EqRhs);
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virtual ~G4MagHelicalStepper();
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void Stepper( const G4double y[],
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const G4double dydx[],
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G4double h,
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G4double yout[],
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G4double yerr[] );
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// The stepper for the Runge Kutta integration.
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// The stepsize is fixed, equal to h.
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// Integrates ODE starting values y[0 to 6]
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// Outputs yout[] and its estimated error yerr[].
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virtual void DumbStepper( const G4double y[],
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G4ThreeVector Bfld,
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G4double h,
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G4double yout[] ) = 0;
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// Performs a 'dump' Step without error calculation.
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G4double DistChord() const;
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// Estimate maximum distance of curved solution and chord ...
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protected: // with description
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inline void LinearStep( const G4double yIn[],
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G4double h,
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G4double yHelix[]);
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// A linear Step in regions without magnetic field.
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void AdvanceHelix( const G4double yIn[],
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G4ThreeVector Bfld,
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G4double h,
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G4double yHelix[]); // output
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// A first order Step along a helix inside the field.
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inline void MagFieldEvaluate( const G4double y[], G4ThreeVector& Bfield );
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// Evaluate the field at a certain point.
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protected: // without description
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// void MagFieldEvaluate( const G4double y[], G4double B[] )
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// { GetEquationOfMotion()-> GetFieldValue(y, B); }
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private:
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G4MagHelicalStepper(const G4MagHelicalStepper&);
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G4MagHelicalStepper& operator=(const G4MagHelicalStepper&);
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// Private copy constructor and assignment operator.
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private:
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G4ThreeVector yInitial, yMidPoint, yFinal;
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// Data stored in order to find the chord.
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G4Mag_EqRhs* fPtrMagEqOfMot;
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};
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#include "G4MagHelicalStepper.icc"
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#endif /* G4MagHelicalStepper_hh */
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