[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 | // |
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| 27 | // |
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| 28 | // $Id: G4MagHelicalStepper.hh,v 1.15 2007/08/21 08:48:28 tnikitin Exp $ |
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[850] | 29 | // GEANT4 tag $Name: HEAD $ |
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[831] | 30 | // |
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| 31 | // |
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| 32 | // |
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| 33 | // class G4MagHelicalStepper |
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| 34 | // |
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| 35 | // Class description: |
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| 36 | // |
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| 37 | // Abstract base class for integrator of particle's equation of motion, |
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| 38 | // used in tracking in space dependent magnetic field |
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| 39 | |
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| 40 | // History: |
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| 41 | // - 05.11.98 J.Apostolakis Creation of new ABC |
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| 42 | // -------------------------------------------------------------------- |
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| 43 | |
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| 44 | #ifndef G4MagHelicalStepper_hh |
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| 45 | #define G4MagHelicalStepper_hh |
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| 46 | |
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| 47 | #include "G4Types.hh" |
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| 48 | #include "G4MagIntegratorStepper.hh" |
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| 49 | #include "G4Mag_EqRhs.hh" |
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| 50 | #include "G4ThreeVector.hh" |
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| 51 | |
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| 52 | class G4MagHelicalStepper : public G4MagIntegratorStepper |
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| 53 | { |
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| 54 | public: // with description |
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| 55 | |
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| 56 | G4MagHelicalStepper(G4Mag_EqRhs *EqRhs); |
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| 57 | virtual ~G4MagHelicalStepper(); |
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| 58 | |
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| 59 | virtual void Stepper( const G4double y[], // VIRTUAL for ExactHelix - temporary |
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| 60 | const G4double dydx[], |
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| 61 | G4double h, |
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| 62 | G4double yout[], |
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| 63 | G4double yerr[] ); |
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| 64 | // The stepper for the Runge Kutta integration. |
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| 65 | // The stepsize is fixed, equal to h. |
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| 66 | // Integrates ODE starting values y[0 to 6] |
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| 67 | // Outputs yout[] and its estimated error yerr[]. |
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| 68 | |
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| 69 | virtual void DumbStepper( const G4double y[], |
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| 70 | G4ThreeVector Bfld, |
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| 71 | G4double h, |
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| 72 | G4double yout[] ) = 0; |
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| 73 | // Performs a 'dump' Step without error calculation. |
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| 74 | |
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| 75 | G4double DistChord()const ; |
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| 76 | // Estimate maximum distance of curved solution and chord ... |
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| 77 | |
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| 78 | protected: // with description |
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| 79 | |
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| 80 | inline void LinearStep( const G4double yIn[], |
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| 81 | G4double h, |
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| 82 | G4double yHelix[]) const; |
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| 83 | // A linear Step in regions without magnetic field. |
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| 84 | |
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| 85 | void AdvanceHelix( const G4double yIn[], |
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| 86 | G4ThreeVector Bfld, |
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| 87 | G4double h, |
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| 88 | G4double yHelix[],G4double yHelix2[]=0); // output |
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| 89 | // A first order Step along a helix inside the field. |
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| 90 | |
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| 91 | inline void MagFieldEvaluate( const G4double y[], G4ThreeVector& Bfield ); |
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| 92 | // Evaluate the field at a certain point. |
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| 93 | |
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| 94 | |
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| 95 | inline G4double GetInverseCurve( const G4double Momentum, const G4double Bmag ); |
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| 96 | // Evaluate Inverse of Curvature of Track |
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| 97 | |
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| 98 | // Store and use the parameters of track : |
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| 99 | // Radius of curve, Stepping angle, Radius of projected helix |
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| 100 | inline void SetAngCurve(const G4double Ang); |
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| 101 | inline G4double GetAngCurve()const; |
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| 102 | |
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| 103 | inline void SetCurve(const G4double Curve); |
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| 104 | inline G4double GetCurve()const; |
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| 105 | |
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| 106 | inline void SetRadHelix(const G4double Rad); |
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| 107 | inline G4double GetRadHelix()const; |
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| 108 | |
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| 109 | |
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| 110 | protected: // without description |
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| 111 | |
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| 112 | // void MagFieldEvaluate( const G4double y[], G4double B[] ) |
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| 113 | // { GetEquationOfMotion()-> GetFieldValue(y, B); } |
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| 114 | |
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| 115 | private: |
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| 116 | |
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| 117 | G4MagHelicalStepper(const G4MagHelicalStepper&); |
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| 118 | G4MagHelicalStepper& operator=(const G4MagHelicalStepper&); |
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| 119 | // Private copy constructor and assignment operator. |
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| 120 | |
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| 121 | static const G4double fUnitConstant; // As in G4Mag_EqRhs.hh/cc where it is not used. |
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| 122 | private: |
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| 123 | |
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| 124 | G4Mag_EqRhs* fPtrMagEqOfMot; |
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| 125 | |
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| 126 | // Data stored in order to find the chord. |
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| 127 | G4double fAngCurve; |
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| 128 | G4double frCurve; |
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| 129 | G4double frHelix; |
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| 130 | // Data stored in order to find the chord. |
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| 131 | G4ThreeVector yInitial, yMidPoint, yFinal; |
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| 132 | |
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| 133 | |
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| 134 | }; |
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| 135 | |
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| 136 | #include "G4MagHelicalStepper.icc" |
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| 137 | |
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| 138 | #endif /* G4MagHelicalStepper_hh */ |
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