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G4HelixMixedStepper.hh
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25 //
26 // class G4HelixMixedStepper
27 //
28 // Class description:
29 //
30 // G4HelixMixedStepper split the Method used for Integration in two:
31 //
32 // If Stepping Angle ( h / R_curve) < pi/3 : use Stepper for small step
33 //
34 // Else use HelixExplicitEuler Stepper
35 //
36 // Stepper for the small step is G4ClassicalRK4 by default, but
37 // it possible to choose other stepper,like G4CashKarpRK45 or G4RKG3_Stepper,
38 // by setting StepperNumber : new HelixMixedStepper(EqRhs,N)
39 //
40 // N=2 G4SimpleRunge; N=3 G4SimpleHeum;
41 // N=4 G4ClassicalRK4;
42 // N=6 G4HelixImplicitEuler; N=7 G4HelixSimpleRunge;
43 // N=8 G4CashKarpRK45; N=9 G4ExactHelixStepper;
44 // N=10 G4RKG3_Stepper; N=13 G4NystromRK4
45 // N=23 BogackiShampine23 N=145 TsitourasRK45
46 // N=45 BogackiShampine45 N=745 DormandPrince745 (ie DoPri5)
47 //
48 // For completeness also available are:
49 // N=11 G4ExplicitEuler N=12 G4ImplicitEuler; -- Likely poor
50 // N=5 G4HelixExplicitEuler (testing only)
51 // For recommendations see comments in 'SetupStepper' method.
52 //
53 // Note: Like other helix steppers, only applicable in pure magnetic field
54 //
55 // History:
56 // Derived from ExactHelicalStepper 18/05/07
57 //
58 // -------------------------------------------------------------------
59 
60 #ifndef G4HELIXMIXEDSTEPPER_HH
61 #define G4HELIXMIXEDSTEPPER_HH
62 
63 #include "G4MagHelicalStepper.hh"
64 
65 
67 {
68 
69  public:
70 
71  G4HelixMixedStepper(G4Mag_EqRhs *EqRhs,G4int StepperNumber= -1, G4double Angle_threshold= -1.0);
73 
74  void Stepper( const G4double y[],
75  const G4double dydx[],
76  G4double h,
77  G4double yout[],
78  G4double yerr[] );
79  // Step 'integration' for step size 'h'
80  // If SteppingAngle=h/R_curve<pi/3 uses RK4Stepper
81  // Else Helix Fast Method
82 
83 
84  void DumbStepper( const G4double y[],
85  G4ThreeVector Bfld,
86  G4double h,
87  G4double yout[]);
88  G4double DistChord() const;
89  // Estimate maximum distance of curved solution and chord ...
90 
91 
92  public: // with description
93 
94  inline void SetVerbose (G4int newvalue){fVerbose=newvalue;}
95 
96  public: // without description
97  void PrintCalls();
99 
100  void SetAngleThreshold( G4double val ){ fAngle_threshold= val;}
101  G4double GetAngleThreshold(){ return fAngle_threshold; }
102 
103  G4int IntegratorOrder() const { return 4; }
104  private:
105 
106  // Mixed Integration RK4 for 'small' steps
107  G4MagIntegratorStepper* fRK4Stepper;
108  G4int fStepperNumber; // Int ID of RK stepper
109 
110  // Threshold angle (in radians ) - above it Helical stepper is used
111  G4double fAngle_threshold;
112  private:
113  // Used for statistic = how many calls to different steppers
114  G4int fVerbose;
115  G4int fNumCallsRK4;
116  G4int fNumCallsHelix;
117 
118 };
119 
120 #endif /* G4HELIXMIXEDSTEPPER_HH */
G4MagIntegratorStepper * SetupStepper(G4Mag_EqRhs *EqRhs, G4int StepperName)
int G4int
Definition: G4Types.hh:78
void SetAngleThreshold(G4double val)
void Stepper(const G4double y[], const G4double dydx[], G4double h, G4double yout[], G4double yerr[])
G4HelixMixedStepper(G4Mag_EqRhs *EqRhs, G4int StepperNumber=-1, G4double Angle_threshold=-1.0)
void DumbStepper(const G4double y[], G4ThreeVector Bfld, G4double h, G4double yout[])
G4int IntegratorOrder() const
void SetVerbose(G4int newvalue)
double G4double
Definition: G4Types.hh:76
G4double DistChord() const