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: G4HelixHeum.hh 69786 2013-05-15 09:38:51Z gcosmo $ 00028 // 00029 // 00030 // class G4HelixHeum 00031 // 00032 // Class description: 00033 // 00034 // Simple Heum stepper for magnetic field: 00035 // x_1 = x_0 + 00036 // h * 1/4 * dx(t0,x0) + 00037 // 3/4 * dx(t0+2/3*h, x0+2/3*h*(dx(t0+h/3,x0+h/3*dx(t0,x0)))) 00038 // Third order solver. 00039 00040 // History: 00041 // - Created. W.Wander <wwc@mit.edu>, 03/11/98 00042 // ------------------------------------------------------------------- 00043 00044 #ifndef G4HELIXHEUM_HH 00045 #define G4HELIXHEUM_HH 00046 00047 #include "G4MagHelicalStepper.hh" 00048 00049 class G4HelixHeum : public G4MagHelicalStepper 00050 { 00051 00052 public: // with description 00053 00054 G4HelixHeum(G4Mag_EqRhs *EqRhs) 00055 : G4MagHelicalStepper(EqRhs) {} 00056 00057 ~G4HelixHeum() {} 00058 00059 void DumbStepper( const G4double y[], 00060 G4ThreeVector Bfld, 00061 G4double h, 00062 G4double yout[]); 00063 00064 public: // without description 00065 00066 G4int IntegratorOrder() const { return 2; } 00067 }; 00068 00069 #endif /* G4HELIXHEUM_HH */