[831] | 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 1.5 2007/05/18 12:50:31 tnikitin Exp $ |
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[1231] | 27 | // GEANT4 tag $Name: $ |
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[831] | 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 | G4ThreeVector fBfieldValue; // Initial value of field at last step |
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| 85 | G4ThreeVector yInitialEHS, yFinalEHS; |
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| 86 | G4ThreeVector pInitial; |
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| 87 | G4double fLastStepSize; // Length of last step |
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| 88 | G4double fYInSav[7]; // Starting state of x, p, ... |
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| 89 | // Values saved for calculating mid-point for chord |
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| 90 | |
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| 91 | G4Mag_EqRhs* fPtrMagEqOfMot; |
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| 92 | }; |
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| 93 | |
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| 94 | |
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| 95 | |
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| 96 | #endif /* G4ExactHelixStepper_hh */ |
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