Gabriele Cosmo
88 lines
3.4 KiB
C++
88 lines
3.4 KiB
C++
// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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//
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// $Id: $
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//
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// Helper namespace 'magneticfield'
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//
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// Description:
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// An implementation of the 7 stage embedded Runge-Kutta 4,5 pair (RK547FEq2)
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// from the paper D. J. Higham and G. Hall,
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// “Embedded Runge-Kutta formulae with stable equilibrium states”,
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// J. Comput. Appl. Math., vol. 29, no. 1, pp. 25–33, Jan. 1990.
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//
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// Implementation by Dmitry Sorokin - GSoC 2017
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// Work supported by Google as part of Google Summer of Code 2017.
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// Supervision / code review: John Apostolakis
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#ifndef G4RK547FEq2_HH
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#define G4RK547FEq2_HH
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#include "G4MagIntegratorStepper.hh"
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#include "G4FieldTrack.hh"
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class G4RK547FEq2 : public G4MagIntegratorStepper {
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public:
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G4RK547FEq2(G4EquationOfMotion* EqRhs, G4int integrationVariables = 6);
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virtual void Stepper(
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const G4double yInput[],
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const G4double dydx[],
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G4double hstep,
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G4double yOutput[],
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G4double yError[]) override;
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void Stepper(
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const G4double yInput[],
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const G4double dydx[],
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G4double hstep,
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G4double yOutput[],
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G4double yError[],
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G4double dydxOutput[]);
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G4RK547FEq2 (const G4RK547FEq2&) = delete;
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G4RK547FEq2& operator = (const G4RK547FEq2&) = delete;
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virtual G4double DistChord() const override;
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virtual G4int IntegratorOrder() const override { return 4; }
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private:
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void makeStep(
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const G4double yInput[],
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const G4double dydx[],
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const G4double hstep,
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G4double yOutput[],
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G4double* dydxOutput = nullptr,
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G4double* yError = nullptr) const;
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G4double fyIn[G4FieldTrack::ncompSVEC],
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fdydx[G4FieldTrack::ncompSVEC],
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fyOut[G4FieldTrack::ncompSVEC],
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fdydxOut[G4FieldTrack::ncompSVEC];
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G4double fhstep= -1.0;
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};
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#endif
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