| 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: $ |
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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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