Gabriele Cosmo
64 lines
2.0 KiB
C++
64 lines
2.0 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 1.2.8.1 1999/12/07 20:48:02 gunter Exp $
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// GEANT4 tag $Name: geant4-01-00 $
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//
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//
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// The right hand size of the equation of motion of a particle
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// in a magnetic field.
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//
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// (Possible use of alternative to "normal" version: rotating reference
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// frame)
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//
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// JA, January 13th, 1996
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//
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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:
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G4Mag_EqRhs( G4MagneticField *magField );
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~G4Mag_EqRhs();
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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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// --------------------------------------------------------
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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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//
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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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G4double FCof() const { return fCof_val; }
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virtual void SetChargeMomentumMass( const G4double particleCharge, // in e+ units
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const G4double MomentumXc,
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const G4double mass);
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private:
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G4double fCof_val;
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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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static const G4double fUnitConstant; // Set in G4Mag_EqRhs.cc
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// to 0.299792458
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};
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#endif /* G4_MAG_EQRHS_DEF */
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