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G4Mag_EqRhs.hh
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27 // $Id: G4Mag_EqRhs.hh 69699 2013-05-13 08:50:30Z gcosmo $
28 //
29 //
30 // class G4Mag_EqRhs
31 //
32 // Class description:
33 //
34 // The "standard" equation of motion of a particle in a pure magnetic field.
35 
36 // History:
37 // - Created. J.Apostolakis, January 13th 1997
38 // --------------------------------------------------------------------
39 
40 #ifndef G4_MAG_EQRHS_DEF
41 #define G4_MAG_EQRHS_DEF
42 
43 #include "G4Types.hh"
44 #include "G4ChargeState.hh"
45 #include "G4EquationOfMotion.hh"
46 
47 class G4MagneticField;
48 
50 {
51  public: // with description
52 
53  G4Mag_EqRhs( G4MagneticField *magField );
54  virtual ~G4Mag_EqRhs();
55  // Constructor and destructor. No actions.
56 
57  virtual void EvaluateRhsGivenB( const G4double y[],
58  const G4double B[3],
59  G4double dydx[] ) const = 0;
60  // Given the value of the field "B", this function
61  // calculates the value of the derivative dydx.
62  // This is the _only_ function a subclass must define.
63  // The other two functions use Rhs_givenB.
64 
65  inline G4double FCof() const;
66 
67  virtual void SetChargeMomentumMass( G4ChargeState particleCharge,
68  G4double MomentumXc,
69  G4double mass);
70 
71  private:
72 
73  G4double fCof_val;
74 
75  static const G4double fUnitConstant; // Set in G4Mag_EqRhs.cc
76  // to 0.299792458
77  // Coefficient in the Lorentz motion equation (Lorentz force), if the
78  // magnetic field B is in Tesla, the particle charge in units of the
79  // elementary (positron?) charge, the momentum P in MeV/c, and the
80  // space coordinates and path along the trajectory in mm .
81 };
82 
83 inline
85 {
86  return fCof_val;
87 }
88 
89 #endif /* G4_MAG_EQRHS_DEF */
double B(double temperature)
G4double FCof() const
Definition: G4Mag_EqRhs.hh:84
virtual void SetChargeMomentumMass(G4ChargeState particleCharge, G4double MomentumXc, G4double mass)
Definition: G4Mag_EqRhs.cc:56
G4Mag_EqRhs(G4MagneticField *magField)
Definition: G4Mag_EqRhs.cc:50
virtual ~G4Mag_EqRhs()
Definition: G4Mag_EqRhs.cc:66
double G4double
Definition: G4Types.hh:76
virtual void EvaluateRhsGivenB(const G4double y[], const G4double B[3], G4double dydx[]) const =0