Gabriele Cosmo
71 lines
2.1 KiB
C++
71 lines
2.1 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: G4RKG3_Stepper.hh,v 1.2.8.1 1999/12/07 20:48:02 gunter Exp $
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// GEANT4 tag $Name: geant4-01-00 $
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//
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//
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// J.Apostolakis, V.Grichine 30.01.97
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#include "G4MagIntegratorStepper.hh"
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#include "G4ThreeVector.hh"
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class G4RKG3_Stepper : public G4MagIntegratorStepper
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{
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public:
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G4RKG3_Stepper(G4Mag_EqRhs *EqRhs): G4MagIntegratorStepper(EqRhs,6){};
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// integrate over 6 variables only: position & velocity
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~G4RKG3_Stepper(){};
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// The method it must provide, even if less efficiently
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void
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Stepper( const G4double yIn[],
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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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// G4double& beta2) const
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G4double DistChord() const ;
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// Additional "optimised" methods:
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// Integrator RK Stepper from G3 with only two field evaluation per
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// Step. It is used in propagation initial Step by small substeps
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// after solution error and delta geometry considerations.
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// B[3] is magnetic field which is passed from substep to substep.
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void StepNoErr( const G4double tIn[7],
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const G4double dydx[7],
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const G4double Step,
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G4double tOut[7],
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G4double B[3] );
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void StepWithEst(const G4double tIn[7],
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const G4double dydx[7],
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const G4double Step,
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G4double tOut[7],
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// G4double tError[6],
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G4double& alpha2, // to delete ?
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G4double& beta2,
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const G4double B1[3],
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G4double B3[3] );
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G4int IntegratorOrder() { return 4; };
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protected:
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// void Field( const double Point[3],
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// double Bfield[3] ) const
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// { EqRhs-> GetFieldValue( Point, Bfield ) ; }
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private:
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G4ThreeVector fyInitial,
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fyMidPoint,
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fyFinal ;
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};
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