Geant4  10.02.p01
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=0 G4ExplicitEuler; N=1 G4ImplicitEuler;
41 // N=2 G4SimpleRunge; N=3 G4SimpleHeum;
42 // N=4 G4ClassicalRK4; N=5 G4HelixExplicitEuler;
43 // N=6 G4HelixExplicitEuler; N=7 G4HelixSimpleRunge;
44 // N=8 G4CashKarpRK45; N=9 G4ExactHelixStepper;
45 // N=10 G4RKG3_Stepper;
46 //
47 // History:
48 // Derived from ExactHelicalStepper 18/05/07
49 //
50 // -------------------------------------------------------------------
51 
52 #ifndef G4HELIXMIXEDSTEPPER_HH
53 #define G4HELIXMIXEDSTEPPER_HH
54 
55 #include "G4MagHelicalStepper.hh"
56 
57 
59 {
60 
61  public:
62 
63  G4HelixMixedStepper(G4Mag_EqRhs *EqRhs,G4int fStepperNumber= -1, G4double Angle_threshold= -1.0);
65 
66  void Stepper( const G4double y[],
67  const G4double dydx[],
68  G4double h,
69  G4double yout[],
70  G4double yerr[] );
71  // Step 'integration' for step size 'h'
72  // If SteppingAngle=h/R_curve<pi/3 uses RK4Stepper
73  // Else Helix Fast Method
74 
75 
76  void DumbStepper( const G4double y[],
77  G4ThreeVector Bfld,
78  G4double h,
79  G4double yout[]);
80  G4double DistChord() const;
81  // Estimate maximum distance of curved solution and chord ...
82 
83 
84  public: // with description
85 
86  inline void SetVerbose (G4int newvalue){fVerbose=newvalue;}
87 
88  public: // without description
89  void PrintCalls();
91 
94 
95  G4int IntegratorOrder() const { return 4; }
96  private:
97  // Mixed Integration RK4 for 'small' steps
99  // Threshold angle (in radians ) - above it Helical stepper is used
101  private:
102  // Used for statistic = how many calls to different steppers
106 
107 };
108 
109 #endif /* G4HELIXMIXEDSTEPPER_HH */
CLHEP::Hep3Vector G4ThreeVector
G4MagIntegratorStepper * SetupStepper(G4Mag_EqRhs *EqRhs, G4int StepperName)
int G4int
Definition: G4Types.hh:78
void SetAngleThreshold(G4double val)
G4HelixMixedStepper(G4Mag_EqRhs *EqRhs, G4int fStepperNumber=-1, G4double Angle_threshold=-1.0)
void Stepper(const G4double y[], const G4double dydx[], G4double h, G4double yout[], G4double yerr[])
G4MagIntegratorStepper * fRK4Stepper
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