Gabriele Cosmo
102 lines
3.8 KiB
C++
102 lines
3.8 KiB
C++
//
|
|
// ********************************************************************
|
|
// * License and Disclaimer *
|
|
// * *
|
|
// * The Geant4 software is copyright of the Copyright Holders of *
|
|
// * the Geant4 Collaboration. It is provided under the terms and *
|
|
// * conditions of the Geant4 Software License, included in the file *
|
|
// * LICENSE and available at http://cern.ch/geant4/license . These *
|
|
// * include a list of copyright holders. *
|
|
// * *
|
|
// * Neither the authors of this software system, nor their employing *
|
|
// * institutes,nor the agencies providing financial support for this *
|
|
// * work make any representation or warranty, express or implied, *
|
|
// * regarding this software system or assume any liability for its *
|
|
// * use. Please see the license in the file LICENSE and URL above *
|
|
// * for the full disclaimer and the limitation of liability. *
|
|
// * *
|
|
// * This code implementation is the result of the scientific and *
|
|
// * technical work of the GEANT4 collaboration. *
|
|
// * By using, copying, modifying or distributing the software (or *
|
|
// * any work based on the software) you agree to acknowledge its *
|
|
// * use in resulting scientific publications, and indicate your *
|
|
// * acceptance of all terms of the Geant4 Software license. *
|
|
// ********************************************************************
|
|
//
|
|
// G4Mag_SpinEqRhs
|
|
//
|
|
// Class description:
|
|
//
|
|
// This is the equation of motion for a particle with spin in a pure
|
|
// magnetic field. The three components of the particle's spin are
|
|
// treated utilising BMT equation.
|
|
|
|
// Authors: John Apostolakis (CERN) & Peter Gumplinger (TRIUMF), 08.02.1999
|
|
// --------------------------------------------------------------------
|
|
#ifndef G4MAG_SPIN_EQRHS_HH
|
|
#define G4MAG_SPIN_EQRHS_HH
|
|
|
|
#include "G4Types.hh"
|
|
#include "G4Mag_EqRhs.hh"
|
|
#include "G4ChargeState.hh"
|
|
|
|
class G4MagneticField;
|
|
|
|
/**
|
|
* @brief G4Mag_SpinEqRhs defines the equation of motion for a particle with
|
|
* spin in a pure magnetic field. The three components of the particle's spin
|
|
* are treated utilising BMT equation.
|
|
*/
|
|
|
|
class G4Mag_SpinEqRhs : public G4Mag_EqRhs
|
|
{
|
|
public:
|
|
|
|
/**
|
|
* Constructor for G4Mag_SpinEqRhs.
|
|
* @param[in] MagField Pointer to the associated magnetic field.
|
|
*/
|
|
G4Mag_SpinEqRhs( G4MagneticField* MagField );
|
|
|
|
/**
|
|
* Default Destructor.
|
|
*/
|
|
~G4Mag_SpinEqRhs() override = default;
|
|
|
|
/**
|
|
* Sets the charge momentum mass value.
|
|
*/
|
|
void SetChargeMomentumMass(G4ChargeState particleCharge,
|
|
G4double MomentumXc,
|
|
G4double mass) override;
|
|
|
|
/**
|
|
* Calculates the value of the derivative, given the value of the field.
|
|
* @param[in] y Coefficients array.
|
|
* @param[in] B Field value.
|
|
* @param[out] dydx Derivatives array.
|
|
*/
|
|
void EvaluateRhsGivenB( const G4double y[],
|
|
const G4double B[3],
|
|
G4double dydx[] ) const override;
|
|
|
|
/**
|
|
* Setter and getter for the magnetic anomaly.
|
|
*/
|
|
inline void SetAnomaly(G4double a) { anomaly = a; }
|
|
inline G4double GetAnomaly() const { return anomaly; }
|
|
|
|
/**
|
|
* Returns the equation of motion type ID, i.e. "kEqMagneticWithSpin".
|
|
*/
|
|
inline G4EquationType GetEquationType() const override { return kEqMagneticWithSpin; }
|
|
|
|
private:
|
|
|
|
G4double charge=0.0, mass=0.0, magMoment=0.0, spin=0.0;
|
|
G4double omegac=0.0, anomaly=0.0011659208;
|
|
G4double beta=0.0, gamma=0.0;
|
|
};
|
|
|
|
#endif
|