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: G4ElectroMagneticField.hh 69786 2013-05-15 09:38:51Z gcosmo $ 00028 // 00029 // 00030 // class G4ElectroMagneticField 00031 // 00032 // Class description: 00033 // 00034 // A full Electromagnetic field, containing both electric and magnetic fields. 00035 // It is an abstract class, and a derived type of this field must be 00036 // created by the user to describe his/her field configuration. 00037 00038 // We have established a convention for the electromagnetic field components: 00039 // In the GetValue method, the return values of Bfield will have 00040 // the following meaning 00041 // - Components 0, 1 and 2 are the Magnetic Field (x, y, z respectively); 00042 // - Components 3, 4 and 5 are the Electric field (x, y, z respectively). 00043 // 00044 // Note 1: one or the other field could optional, depending on the Equation 00045 // Note 2: such a convention is required between any field and its 00046 // corresponding equation of motion. 00047 // 00048 // History: 00049 // - Created: J. Apostolakis, November 12th, 1998 00050 // - Modified: 00051 // V. Grichine 8 Nov 2001: Extended "Point" arg to [4] array to add time 00052 // G. Cosmo 2 Apr 2003: Reorgansised, moved inline methods to .cc 00053 // J. Apostolakis 5 Nov 2003: Derive directly from G4Field 00054 // J. Apostolakis 31 Aug 2004: Information on convention for components 00055 // ------------------------------------------------------------------- 00056 00057 #ifndef G4ELECTROMAGNETIC_FIELD_DEF 00058 #define G4ELECTROMAGNETIC_FIELD_DEF 00059 00060 #include "G4Field.hh" 00061 00062 class G4ElectroMagneticField : public G4Field 00063 { 00064 public: // with description 00065 00066 G4ElectroMagneticField(); 00067 virtual ~G4ElectroMagneticField(); 00068 00069 G4ElectroMagneticField(const G4ElectroMagneticField &r); 00070 G4ElectroMagneticField& operator = (const G4ElectroMagneticField &p); 00071 // Copy constructor & assignment operators. 00072 00073 virtual void GetFieldValue(const G4double Point[4], 00074 G4double *Bfield ) const = 0; 00075 // Return as Bfield[0], [1], [2] the magnetic field x, y & z components 00076 // and as Bfield[3], [4], [5] the electric field x, y & z components 00077 00078 virtual G4bool DoesFieldChangeEnergy() const = 0; 00079 00080 // For field with an electric component this should be true 00081 // For pure magnetic field this should be false 00082 // Alternative: default safe implementation { return true; } 00083 }; 00084 00085 #endif /* G4ELECTROMAGNETIC_FIELD_DEF */