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: G4HelixExplicitEuler.hh 69786 2013-05-15 09:38:51Z gcosmo $ 00028 // 00029 // 00030 // class G4HelixExplicitEuler 00031 // 00032 // Class description: 00033 // 00034 // Helix Explicit Euler: x_1 = x_0 + helix(h) 00035 // with helix(h) being a helix piece of length h. 00036 // A simple approach for solving linear differential equations. 00037 // Take the current derivative and add it to the current position. 00038 00039 // History: 00040 // - Created. W.Wander <wwc@mit.edu>, 12/09/97 00041 // ------------------------------------------------------------------- 00042 00043 #ifndef G4HELIXEXPLICITEULER_HH 00044 #define G4HELIXEXPLICITEULER_HH 00045 00046 #include "G4MagHelicalStepper.hh" 00047 00048 class G4HelixExplicitEuler : public G4MagHelicalStepper 00049 { 00050 public: // with description 00051 00052 G4HelixExplicitEuler(G4Mag_EqRhs *EqRhs) 00053 : G4MagHelicalStepper(EqRhs) {} 00054 00055 ~G4HelixExplicitEuler() {} 00056 void Stepper( const G4double y[], 00057 const G4double*, 00058 G4double h, 00059 G4double yout[], 00060 G4double yerr[] ); 00061 00062 void DumbStepper( const G4double y[], 00063 G4ThreeVector Bfld, 00064 G4double h, 00065 G4double yout[]); 00066 00067 G4double DistChord() const; 00068 public: // without description 00069 00070 // DELETED RightHandSide( ) !!!! 00071 // Replaced by MagFieldEvaluate( const G4double y[], G4double B[] ) 00072 // in G4HelicalStepper 00073 00074 G4int IntegratorOrder() const { return 1; } 00075 }; 00076 00077 #endif /* G4EXPLICITEULER_HH */