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25 // 25 //
26 // G4HelixImplicitEuler << 26 //
>> 27 // $Id: G4HelixImplicitEuler.hh,v 1.8 2006/06/29 18:22:38 gunter Exp $
>> 28 // GEANT4 tag $Name: geant4-09-01 $
>> 29 //
>> 30 //
>> 31 // class G4HelixImplicitEuler
27 // 32 //
28 // Class description: 33 // Class description:
29 // 34 //
30 // Helix Implicit Euler stepper for magnetic 35 // Helix Implicit Euler stepper for magnetic field:
31 // x_1 = x_0 + 1/2 * ( helix(h,t_0,x_0) 36 // x_1 = x_0 + 1/2 * ( helix(h,t_0,x_0)
32 // + helix(h,t_0+h,x_ 37 // + helix(h,t_0+h,x_0+helix(h,t0,x0) ) )
33 // Second order solver. 38 // Second order solver.
34 // Take the current derivative and add it to 39 // Take the current derivative and add it to the current position.
35 // Take the output and its derivative. Add th 40 // Take the output and its derivative. Add the mean of both derivatives
36 // to form the final output. 41 // to form the final output.
37 42
38 // Author: W.Wander <wwc@mit.edu>, 03/11/1998 << 43 // History:
>> 44 // - Created. W.Wander <wwc@mit.edu>, 03/11/98
39 // ------------------------------------------- 45 // -------------------------------------------------------------------
>> 46
40 #ifndef G4HELIXIMPLICITEULER_HH 47 #ifndef G4HELIXIMPLICITEULER_HH
41 #define G4HELIXIMPLICITEULER_HH 48 #define G4HELIXIMPLICITEULER_HH
42 49
43 #include "G4MagHelicalStepper.hh" 50 #include "G4MagHelicalStepper.hh"
44 51
45 class G4HelixImplicitEuler : public G4MagHelic 52 class G4HelixImplicitEuler : public G4MagHelicalStepper
46 { 53 {
47 public: <<
48 54
49 G4HelixImplicitEuler(G4Mag_EqRhs *EqRhs); << 55 public: // with description
50 ~G4HelixImplicitEuler() override; << 56
>> 57 G4HelixImplicitEuler(G4Mag_EqRhs *EqRhs)
>> 58 : G4MagHelicalStepper(EqRhs) {}
>> 59
>> 60 ~G4HelixImplicitEuler() {}
51 61
52 void DumbStepper( const G4double y[], 62 void DumbStepper( const G4double y[],
53 G4ThreeVector Bfld << 63 G4ThreeVector Bfld,
54 G4double h, << 64 G4double h,
55 G4double yout << 65 G4double yout[]);
56 66
57 inline G4int IntegratorOrder() const overr << 67 public: // without description
>> 68
>> 69 G4int IntegratorOrder() const { return 2; }
58 }; 70 };
59 71
60 #endif << 72 #endif /* G4HELIXIMPLICITEULER_HH */
61 73