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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