Gabriele Cosmo
96 lines
3.7 KiB
C++
96 lines
3.7 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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// G4Mag_EqRhs
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//
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// Class description:
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//
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// The "standard" equation of motion of a particle in a pure magnetic field.
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// Other that might be required are:
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// i) is when using a moving reference frame ... or
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// ii) extending for other forces, e.g. an electric field
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// Author: John Apostolakis (CERN), 13.01.1997
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// --------------------------------------------------------------------
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#ifndef G4MAG_EQRHS_HH
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#define G4MAG_EQRHS_HH
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#include "G4Types.hh"
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#include "G4ChargeState.hh"
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#include "G4EquationOfMotion.hh"
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class G4MagneticField;
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/**
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* @brief G4Mag_EqRhs is the "standard" equation of motion of a particle
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* in a pure magnetic field.
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*/
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class G4Mag_EqRhs : public G4EquationOfMotion
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{
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public:
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/**
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* Constructor for G4Mag_EqRhs.
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* @param[in] magField Pointer to the associated magnetic field.
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*/
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G4Mag_EqRhs(G4MagneticField* magField);
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/**
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* Default Destructor.
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*/
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~G4Mag_EqRhs() override = default;
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/**
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* Calculates the value of the derivative, given the value of the field.
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* @param[in] y Coefficients array.
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* @param[in] B Field value.
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* @param[out] dydx Derivatives array.
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*/
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void EvaluateRhsGivenB( const G4double y[],
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const G4double B[3],
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G4double dydx[] ) const override = 0;
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/**
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* Returns and sets the charge momentum mass value.
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*/
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inline G4double FCof() const { return fCof_val; }
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void SetChargeMomentumMass( G4ChargeState particleCharge,
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G4double MomentumXc,
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G4double mass ) override;
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private:
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/** Charge momentum mass. */
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G4double fCof_val = 0.0;
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/** Coefficient in the Lorentz motion equation (Lorentz force), if the
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magnetic field B is in Tesla, the particle charge in units of the
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elementary charge, the momentum P in MeV/c, and the space coordinates
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and path along the trajectory in mm. */
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static const G4double fUnitConstant; // Set to 0.299792458
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};
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#endif
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