Gabriele Cosmo
73 lines
2.2 KiB
C++
73 lines
2.2 KiB
C++
// This code implementation is the intellectual property of
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// the GEANT4 collaboration.
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//
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// By copying, distributing or modifying the Program (or any work
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// based on the Program) you indicate your acceptance of this statement,
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// and all its terms.
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//
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// $Id: G4Mag_EqRhs.hh,v 1.5 2000/11/01 15:15:50 gcosmo Exp $
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// GEANT4 tag $Name: geant4-03-00 $
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//
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//
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// class G4Mag_EqRhs
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//
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// Class description:
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//
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// The "standard" right-hand side for the equation of motion of a particle
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// in a pure magnetic field.
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// Others that might be required are:
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// i) when using a moving reference frame ... or
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// ii) extending for other forces, eg an electric field.
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// History:
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// - Created. J.Apostolakis, January 13th 1996
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#ifndef G4_MAG_EQRHS_DEF
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#define G4_MAG_EQRHS_DEF
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#include "globals.hh"
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#include "G4EquationOfMotion.hh"
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#include "G4MagneticField.hh" // class G4MagneticField; not enough ??
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class G4Mag_EqRhs : public G4EquationOfMotion
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{
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public: // with description
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G4Mag_EqRhs( G4MagneticField *magField );
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virtual ~G4Mag_EqRhs();
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// Constructor and destructor. No actions.
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virtual void EvaluateRhsGivenB( const G4double y[],
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const G4double B[3],
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G4double dydx[] ) const = 0;
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// Given the value of the field "B", this function
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// calculates the value of the derivative dydx.
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// This is the _only_ function a subclass must define.
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// The other two functions use Rhs_givenB.
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inline G4double FCof() const;
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virtual void SetChargeMomentumMass( G4double particleCharge, // in e+ units
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G4double MomentumXc,
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G4double mass);
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private:
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G4double fCof_val;
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static const G4double fUnitConstant; // Set in G4Mag_EqRhs.cc
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// to 0.299792458
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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 (positron?) charge, the momentum P in MeV/c, and the
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// space coordinates and path along the trajectory in mm .
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};
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inline
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G4double G4Mag_EqRhs::FCof() const
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{
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return fCof_val;
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}
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#endif /* G4_MAG_EQRHS_DEF */
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