| 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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