00001 // 00002 // ******************************************************************** 00003 // * License and Disclaimer * 00004 // * * 00005 // * The Geant4 software is copyright of the Copyright Holders of * 00006 // * the Geant4 Collaboration. It is provided under the terms and * 00007 // * conditions of the Geant4 Software License, included in the file * 00008 // * LICENSE and available at http://cern.ch/geant4/license . These * 00009 // * include a list of copyright holders. * 00010 // * * 00011 // * Neither the authors of this software system, nor their employing * 00012 // * institutes,nor the agencies providing financial support for this * 00013 // * work make any representation or warranty, express or implied, * 00014 // * regarding this software system or assume any liability for its * 00015 // * use. Please see the license in the file LICENSE and URL above * 00016 // * for the full disclaimer and the limitation of liability. * 00017 // * * 00018 // * This code implementation is the result of the scientific and * 00019 // * technical work of the GEANT4 collaboration. * 00020 // * By using, copying, modifying or distributing the software (or * 00021 // * any work based on the software) you agree to acknowledge its * 00022 // * use in resulting scientific publications, and indicate your * 00023 // * acceptance of all terms of the Geant4 Software license. * 00024 // ******************************************************************** 00025 // 00026 // 00027 // $Id: G4Mag_SpinEqRhs.hh 69786 2013-05-15 09:38:51Z gcosmo $ 00028 // 00029 // 00030 // class G4Mag_SpinEqRhs 00031 // 00032 // Class description: 00033 // 00034 // This is the equation of motion for a particle with spin in a pure 00035 // magnetic field. The three components of the particle's spin are 00036 // treated utilising BMT equation. 00037 00038 // History: 00039 // - Created: J.Apostolakis, P.Gumplinger - February 8th, 1999. 00040 // -------------------------------------------------------------------- 00041 00042 #ifndef G4MAG_SPIN_EQRHS 00043 #define G4MAG_SPIN_EQRHS 00044 00045 #include "G4Types.hh" 00046 #include "G4Mag_EqRhs.hh" 00047 00048 class G4MagneticField; 00049 00050 class G4Mag_SpinEqRhs : public G4Mag_EqRhs 00051 { 00052 public: // with description 00053 00054 G4Mag_SpinEqRhs( G4MagneticField* MagField ); 00055 ~G4Mag_SpinEqRhs(); 00056 // Constructor and destructor. No actions. 00057 00058 void SetChargeMomentumMass(G4double particleCharge, // in e+ units 00059 G4double MomentumXc, 00060 G4double mass); 00061 00062 void EvaluateRhsGivenB( const G4double y[], 00063 const G4double B[3], 00064 G4double dydx[] ) const; 00065 // Given the value of the magnetic field B, this function 00066 // calculates the value of the derivative dydx. 00067 00068 inline void SetAnomaly(G4double a) { anomaly = a; } 00069 inline G4double GetAnomaly() const { return anomaly; } 00070 // set/get magnetic anomaly 00071 00072 private: 00073 00074 G4double omegac; 00075 G4double anomaly; 00076 G4double pcharge; 00077 G4double E; 00078 G4double gamma; 00079 G4double beta; 00080 }; 00081 00082 #endif /* G4MAG_SPIN_EQRHS */