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 // $Id: G4ExactHelixStepper.hh 69786 2013-05-15 09:38:51Z gcosmo $ 00027 // 00028 // 00029 // class G4ExactHelixStepper 00030 // ------------------- 00031 // Class description: 00032 // 00033 // Concrete class for particle motion in constant magnetic field. 00034 00035 // History: 00036 // - 28.Jan.05 J.Apostolakis Creation of new concrete class 00037 // -------------------------------------------------------------------- 00038 00039 #ifndef G4ExactHelixStepper_hh 00040 #define G4ExactHelixStepper_hh 00041 00042 #include "G4Types.hh" 00043 #include "G4ThreeVector.hh" 00044 00045 #include "G4MagIntegratorStepper.hh" 00046 #include "G4MagHelicalStepper.hh" 00047 #include "G4Mag_EqRhs.hh" 00048 00049 class G4ExactHelixStepper : public G4MagHelicalStepper 00050 { 00051 public: // with description 00052 00053 G4ExactHelixStepper(G4Mag_EqRhs *EqRhs); 00054 ~G4ExactHelixStepper(); 00055 00056 void Stepper( const G4double y[], 00057 const G4double dydx[], 00058 G4double h, 00059 G4double yout[], 00060 G4double yerr[] ); 00061 // Step 'integration' for step size 'h' 00062 // Provides helix starting at y[0 to 6] 00063 // Outputs yout[] and ZERO estimated error yerr[]=0. 00064 00065 void DumbStepper( const G4double y[], 00066 G4ThreeVector Bfld, 00067 G4double h, 00068 G4double yout[] ); 00069 // Performs a 'dump' Step without error calculation. 00070 00071 G4double DistChord() const; 00072 // Estimate maximum distance of curved solution and chord ... 00073 00074 virtual G4int IntegratorOrder() const; 00075 00076 private: 00077 00078 G4ExactHelixStepper(const G4ExactHelixStepper&); 00079 G4ExactHelixStepper& operator=(const G4ExactHelixStepper&); 00080 // Private copy constructor and assignment operator. 00081 00082 private: 00083 00084 G4ThreeVector fBfieldValue; 00085 // Initial value of field at last step 00086 G4Mag_EqRhs* fPtrMagEqOfMot; 00087 }; 00088 00089 00090 00091 #endif /* G4ExactHelixStepper_hh */