| 1 | //
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| 2 | // ********************************************************************
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| 3 | // * License and Disclaimer *
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| 4 | // * *
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of *
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and *
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| 7 | // * conditions of the Geant4 Software License, included in the file *
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These *
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| 9 | // * include a list of copyright holders. *
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| 10 | // * *
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| 11 | // * Neither the authors of this software system, nor their employing *
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| 12 | // * institutes,nor the agencies providing financial support for this *
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| 13 | // * work make any representation or warranty, express or implied, *
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| 14 | // * regarding this software system or assume any liability for its *
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| 15 | // * use. Please see the license in the file LICENSE and URL above *
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| 16 | // * for the full disclaimer and the limitation of liability. *
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| 17 | // * *
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| 18 | // * This code implementation is the result of the scientific and *
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| 19 | // * technical work of the GEANT4 collaboration. *
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| 20 | // * By using, copying, modifying or distributing the software (or *
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| 21 | // * any work based on the software) you agree to acknowledge its *
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| 22 | // * use in resulting scientific publications, and indicate your *
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| 23 | // * acceptance of all terms of the Geant4 Software license. *
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| 24 | // ********************************************************************
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| 25 | //
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| 26 | //
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| 27 | // $Id: G4Mag_EqRhs.hh,v 1.9 2006/06/29 18:23:07 gunter Exp $
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| 28 | // GEANT4 tag $Name: geant4-09-02-cand-01 $
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| 29 | //
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| 30 | //
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| 31 | // class G4Mag_EqRhs
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| 32 | //
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| 33 | // Class description:
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| 34 | //
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| 35 | // The "standard" equation of motion of a particle in a pure magnetic field.
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| 36 |
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| 37 | // History:
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| 38 | // - Created. J.Apostolakis, January 13th 1997
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| 39 | // --------------------------------------------------------------------
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| 40 |
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| 41 | #ifndef G4_MAG_EQRHS_DEF
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| 42 | #define G4_MAG_EQRHS_DEF
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| 43 |
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| 44 | #include "G4Types.hh"
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| 45 | #include "G4EquationOfMotion.hh"
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| 46 |
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| 47 | class G4MagneticField;
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| 48 |
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| 49 | class G4Mag_EqRhs : public G4EquationOfMotion
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| 50 | {
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| 51 | public: // with description
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| 52 |
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| 53 | G4Mag_EqRhs( G4MagneticField *magField );
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| 54 | virtual ~G4Mag_EqRhs();
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| 55 | // Constructor and destructor. No actions.
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| 56 |
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| 57 | virtual void EvaluateRhsGivenB( const G4double y[],
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| 58 | const G4double B[3],
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| 59 | G4double dydx[] ) const = 0;
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| 60 | // Given the value of the field "B", this function
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| 61 | // calculates the value of the derivative dydx.
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| 62 | // This is the _only_ function a subclass must define.
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| 63 | // The other two functions use Rhs_givenB.
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| 64 |
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| 65 | inline G4double FCof() const;
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| 66 |
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| 67 | virtual void SetChargeMomentumMass( G4double particleCharge, // in e+ units
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| 68 | G4double MomentumXc,
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| 69 | G4double mass);
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| 70 |
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| 71 | private:
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| 72 |
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| 73 | G4double fCof_val;
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| 74 |
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| 75 | static const G4double fUnitConstant; // Set in G4Mag_EqRhs.cc
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| 76 | // to 0.299792458
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| 77 | // Coefficient in the Lorentz motion equation (Lorentz force), if the
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| 78 | // magnetic field B is in Tesla, the particle charge in units of the
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| 79 | // elementary (positron?) charge, the momentum P in MeV/c, and the
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| 80 | // space coordinates and path along the trajectory in mm .
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| 81 | };
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| 82 |
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| 83 | inline
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| 84 | G4double G4Mag_EqRhs::FCof() const
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| 85 | {
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| 86 | return fCof_val;
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| 87 | }
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| 88 |
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| 89 | #endif /* G4_MAG_EQRHS_DEF */
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