Gabriele Cosmo
89 lines
2.4 KiB
C++
89 lines
2.4 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: G4MagHelicalStepper.hh,v 1.1.10.1 1999/12/07 20:48:01 gunter Exp $
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// GEANT4 tag $Name: geant4-01-00 $
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// Started from G4MagErrorStepper.hh
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//
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// Abstract base class (ie Interface)
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// -------------------
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// for integrator of particle's equation of motion,
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// used in tracking in space dependent magnetic field
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// -----------------------------------------------------
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//
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// History:
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// 05.11.98 J.Apostolakis Creation of new ABC
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//
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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:
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G4MagHelicalStepper(G4Mag_EqRhs *EqRhs);
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~G4MagHelicalStepper(){} ;
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// The stepper for the Runge Kutta integration. The stepsize
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// 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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void Stepper( const G4double y[],
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const G4double dydx[],
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const G4double h,
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G4double yout[],
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G4double yerr[] );
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// performs a 'dump' Step without error calculation.
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virtual void DumbStepper( const G4double y[],
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const G4double dydx[],
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const G4double h,
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G4double yout[] ) = 0;
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// Estimate maximum distance of curved solution and chord ...
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G4double DistChord() const;
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// --- Methods used to implement all the derived classes -----
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protected:
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// a linear Step in regions without magnetic field
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inline void LinearStep( const G4double yIn[],
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const G4double h,
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G4double yHelix[]);
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// a first order Step along a helix inside the field
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void AdvanceHelix( const G4double yIn[],
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const G4double B[],
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const G4double h,
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G4double yHelix[]);
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// evaluate the field at a certain point
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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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// Data stored in order to find the chord
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G4ThreeVector yInitial, yMidPoint, yFinal;
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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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