Gabriele Cosmo
111 lines
4.1 KiB
C++
111 lines
4.1 KiB
C++
//
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// ********************************************************************
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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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//
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// $Id: G4RKG3_Stepper.hh,v 1.13 2007/05/18 12:44:02 tnikitin Exp $
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// GEANT4 tag $Name: geant4-09-01 $
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//
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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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//
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// History:
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// - Created. J.Apostolakis, V.Grichine - 30.01.97
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// -------------------------------------------------------------------
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#ifndef G4RKG3_Stepper_hh
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#define G4RKG3_Stepper_hh
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#include "G4Types.hh"
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#include "G4MagIntegratorStepper.hh"
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#include "G4ThreeVector.hh"
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class G4Mag_EqRhs;
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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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// Integrate over 6 variables only: position & velocity.
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// Not implemented yet !
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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,
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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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private:
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G4ThreeVector fyInitial,
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fyMidPoint,
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fyFinal;
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G4ThreeVector fpInitial;
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G4ThreeVector BfldIn;
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G4double hStep;
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G4Mag_EqRhs* fPtrMagEqOfMot;
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};
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#endif
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