Gabriele Cosmo
86 lines
2.4 KiB
C++
86 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: G4RKG3_Stepper.hh,v 1.5 2000/11/01 15:15:51 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 G4RKG3_Stepper
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//
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// Class description:
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//
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// Integrator Runga-Kutta Stepper from Geant3.
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// History:
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// - Created. J.Apostolakis, V.Grichine - 30.01.97
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#ifndef G4RKG3_Stepper_hh
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#define G4RKG3_Stepper_hh
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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: // with description
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G4RKG3_Stepper(G4Mag_EqRhs *EqRhs)
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: G4MagIntegratorStepper(EqRhs,6){;}
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// Integrate over 6 variables only: position & velocity.
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~G4RKG3_Stepper(){;}
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void Stepper( const G4double yIn[],
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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 method which must be provided, even if less efficient.
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G4double DistChord() const ;
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void StepNoErr( const G4double tIn[7],
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const G4double dydx[7],
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G4double Step,
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G4double tOut[7],
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G4double B[3] );
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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 StepWithEst( const G4double tIn[7],
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const G4double dydx[7],
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G4double Step,
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G4double tOut[7],
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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 B2[3] );
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// Integrator for RK from G3 with evaluation of error in solution and delta
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// geometry based on naive similarity with the case of uniform magnetic field.
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// B1[3] is input and is the first magnetic field values
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// B2[3] is output and is the final magnetic field values.
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public: // without description
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G4int IntegratorOrder() const { return 4; }
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protected:
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// void Field( const G4double Point[3],
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// G4double 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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#endif
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