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1 // 1 //
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18 // * This code implementation is the result 18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboratio 19 // * technical work of the GEANT4 collaboration. *
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24 // ******************************************* 24 // ********************************************************************
25 // 25 //
26 // G4HelixImplicitEuler 26 // G4HelixImplicitEuler
27 // 27 //
28 // Class description: 28 // Class description:
29 // 29 //
30 // Helix Implicit Euler stepper for magnetic 30 // Helix Implicit Euler stepper for magnetic field:
31 // x_1 = x_0 + 1/2 * ( helix(h,t_0,x_0) 31 // x_1 = x_0 + 1/2 * ( helix(h,t_0,x_0)
32 // + helix(h,t_0+h,x_ 32 // + helix(h,t_0+h,x_0+helix(h,t0,x0) ) )
33 // Second order solver. 33 // Second order solver.
34 // Take the current derivative and add it to 34 // Take the current derivative and add it to the current position.
35 // Take the output and its derivative. Add th 35 // Take the output and its derivative. Add the mean of both derivatives
36 // to form the final output. 36 // to form the final output.
37 37
38 // Author: W.Wander <wwc@mit.edu>, 03/11/1998 38 // Author: W.Wander <wwc@mit.edu>, 03/11/1998
39 // ------------------------------------------- 39 // -------------------------------------------------------------------
40 #ifndef G4HELIXIMPLICITEULER_HH 40 #ifndef G4HELIXIMPLICITEULER_HH
41 #define G4HELIXIMPLICITEULER_HH 41 #define G4HELIXIMPLICITEULER_HH
42 42
43 #include "G4MagHelicalStepper.hh" 43 #include "G4MagHelicalStepper.hh"
44 44
45 class G4HelixImplicitEuler : public G4MagHelic 45 class G4HelixImplicitEuler : public G4MagHelicalStepper
46 { 46 {
47 public: 47 public:
48 48
49 G4HelixImplicitEuler(G4Mag_EqRhs *EqRhs); 49 G4HelixImplicitEuler(G4Mag_EqRhs *EqRhs);
50 ~G4HelixImplicitEuler() override; 50 ~G4HelixImplicitEuler() override;
51 51
52 void DumbStepper( const G4double y[], 52 void DumbStepper( const G4double y[],
53 G4ThreeVector Bfld 53 G4ThreeVector Bfld,
54 G4double h, 54 G4double h,
55 G4double yout 55 G4double yout[] ) override;
56 56
57 inline G4int IntegratorOrder() const overr 57 inline G4int IntegratorOrder() const override { return 2; }
58 }; 58 };
59 59
60 #endif 60 #endif
61 61