| 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 | // class G4HelixMixedStepper |
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| 27 | // |
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| 28 | // Class description: |
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| 29 | // |
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| 30 | // G4HelixMixedStepper split the Method used for Integration in two: |
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| 31 | // |
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| 32 | // If Stepping Angle ( h / R_curve) < pi/3 : use Stepper for small step |
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| 33 | // |
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| 34 | // Else use HelixExplicitEuler Stepper |
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| 35 | // |
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| 36 | // Stepper for the small step is G4ClassicalRK4 by default, but |
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| 37 | // it possible to choose other stepper,like G4CashKarpRK45 or G4RKG3_Stepper, |
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| 38 | // by setting StepperNumber : new HelixMixedStepper(EqRhs,N) |
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| 39 | // |
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| 40 | // N=0 G4ExplicitEuler; N=1 G4ImplicitEuler; |
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| 41 | // N=2 G4SimpleRunge; N=3 G4SimpleHeum; |
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| 42 | // N=4 G4ClassicalRK4; N=5 G4HelixExplicitEuler; |
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| 43 | // N=6 G4HelixExplicitEuler; N=7 G4HelixSimpleRunge; |
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| 44 | // N=8 G4CashKarpRK45; N=9 G4ExactHelixStepper; |
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| 45 | // N=10 G4RKG3_Stepper; |
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| 46 | // |
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| 47 | // History: |
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| 48 | // Derived from ExactHelicalStepper 18/05/07 |
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| 49 | // |
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| 50 | // ------------------------------------------------------------------- |
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| 51 | |
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| 52 | #ifndef G4HELIXMIXEDSTEPPER_HH |
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| 53 | #define G4HELIXMIXEDSTEPPER_HH |
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| 54 | |
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| 55 | #include "G4MagHelicalStepper.hh" |
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| 56 | |
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| 57 | |
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| 58 | class G4HelixMixedStepper: public G4MagHelicalStepper |
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| 59 | { |
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| 60 | |
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| 61 | public: |
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| 62 | |
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| 63 | G4HelixMixedStepper(G4Mag_EqRhs *EqRhs,G4int fStepperNumber=0); |
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| 64 | ~G4HelixMixedStepper(); |
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| 65 | |
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| 66 | void Stepper( const G4double y[], |
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| 67 | const G4double dydx[], |
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| 68 | G4double h, |
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| 69 | G4double yout[], |
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| 70 | G4double yerr[] ); |
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| 71 | // Step 'integration' for step size 'h' |
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| 72 | // If SteppingAngle=h/R_curve<pi/3 uses RK4Stepper |
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| 73 | // Else Helix Fast Method |
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| 74 | |
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| 75 | |
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| 76 | void DumbStepper( const G4double y[], |
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| 77 | G4ThreeVector Bfld, |
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| 78 | G4double h, |
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| 79 | G4double yout[]); |
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| 80 | G4double DistChord() const; |
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| 81 | // Estimate maximum distance of curved solution and chord ... |
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| 82 | |
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| 83 | |
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| 84 | public: // with description |
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| 85 | |
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| 86 | inline void SetVerbose (G4int newvalue){fVerbose=newvalue;} |
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| 87 | |
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| 88 | public: // without description |
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| 89 | void PrintCalls(); |
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| 90 | G4MagIntegratorStepper* SetupStepper(G4Mag_EqRhs* EqRhs, G4int StepperName); |
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| 91 | |
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| 92 | |
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| 93 | G4int IntegratorOrder() const { return 4; } |
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| 94 | private: |
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| 95 | // Mixed Integration RK4 for 'small' steps |
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| 96 | G4MagIntegratorStepper* fRK4Stepper; |
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| 97 | |
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| 98 | private: |
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| 99 | // Used for statistic = how many calls to different steppers |
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| 100 | G4int fVerbose; |
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| 101 | G4int fNumCallsRK4; |
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| 102 | G4int fNumCallsHelix; |
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| 103 | |
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| 104 | }; |
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| 105 | |
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| 106 | #endif /* G4HELIXMIXEDSTEPPER_HH */ |
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