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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