| 1 | //
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| 2 | // ********************************************************************
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| 3 | // * License and Disclaimer *
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| 4 | // * *
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of *
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and *
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| 7 | // * conditions of the Geant4 Software License, included in the file *
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These *
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| 9 | // * include a list of copyright holders. *
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| 10 | // * *
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| 11 | // * Neither the authors of this software system, nor their employing *
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| 12 | // * institutes,nor the agencies providing financial support for this *
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| 13 | // * work make any representation or warranty, express or implied, *
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| 14 | // * regarding this software system or assume any liability for its *
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| 15 | // * use. Please see the license in the file LICENSE and URL above *
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| 16 | // * for the full disclaimer and the limitation of liability. *
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| 17 | // * *
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| 18 | // * This code implementation is the result of the scientific and *
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| 19 | // * technical work of the GEANT4 collaboration. *
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| 20 | // * By using, copying, modifying or distributing the software (or *
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| 21 | // * any work based on the software) you agree to acknowledge its *
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| 22 | // * use in resulting scientific publications, and indicate your *
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| 23 | // * acceptance of all terms of the Geant4 Software license. *
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| 24 | // ********************************************************************
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| 25 | //
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| 26 | // $Id: G4ExactHelixStepper.hh,v 1.7 2010/07/21 13:45:37 tnikitin Exp $
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| 27 | // GEANT4 tag $Name: field-V09-03-03 $
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| 28 | //
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| 29 | //
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| 30 | // class G4ExactHelixStepper
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| 31 | // -------------------
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| 32 | // Class description:
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| 33 | //
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| 34 | // Concrete class for particle motion in constant magnetic field.
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| 35 |
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| 36 | // History:
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| 37 | // - 28.Jan.05 J.Apostolakis Creation of new concrete class
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| 38 | // --------------------------------------------------------------------
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| 39 |
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| 40 | #ifndef G4ExactHelixStepper_hh
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| 41 | #define G4ExactHelixStepper_hh
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| 42 |
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| 43 | #include "G4Types.hh"
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| 44 | #include "G4ThreeVector.hh"
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| 45 |
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| 46 | #include "G4MagIntegratorStepper.hh"
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| 47 | #include "G4MagHelicalStepper.hh"
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| 48 | #include "G4Mag_EqRhs.hh"
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| 49 |
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| 50 | class G4ExactHelixStepper : public G4MagHelicalStepper
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| 51 | {
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| 52 | public: // with description
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| 53 |
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| 54 | G4ExactHelixStepper(G4Mag_EqRhs *EqRhs);
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| 55 | ~G4ExactHelixStepper();
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| 56 |
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| 57 | void Stepper( const G4double y[],
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| 58 | const G4double dydx[],
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| 59 | G4double h,
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| 60 | G4double yout[],
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| 61 | G4double yerr[] );
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| 62 | // Step 'integration' for step size 'h'
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| 63 | // Provides helix starting at y[0 to 6]
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| 64 | // Outputs yout[] and ZERO estimated error yerr[]=0.
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| 65 |
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| 66 | void DumbStepper( const G4double y[],
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| 67 | G4ThreeVector Bfld,
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| 68 | G4double h,
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| 69 | G4double yout[] );
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| 70 | // Performs a 'dump' Step without error calculation.
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| 71 |
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| 72 | G4double DistChord() const;
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| 73 | // Estimate maximum distance of curved solution and chord ...
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| 74 |
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| 75 | virtual G4int IntegratorOrder() const;
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| 76 |
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| 77 | private:
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| 78 |
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| 79 | G4ExactHelixStepper(const G4ExactHelixStepper&);
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| 80 | G4ExactHelixStepper& operator=(const G4ExactHelixStepper&);
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| 81 | // Private copy constructor and assignment operator.
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| 82 |
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| 83 | private:
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| 84 |
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| 85 | G4ThreeVector fBfieldValue;
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| 86 | // Initial value of field at last step
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| 87 | G4Mag_EqRhs* fPtrMagEqOfMot;
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| 88 | };
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| 89 |
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| 90 |
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| 91 |
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| 92 | #endif /* G4ExactHelixStepper_hh */
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