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25 // 25 //
26 // G4RKG3_Stepper << 26 //
>> 27 //
>> 28 // $Id: G4RKG3_Stepper.hh 69786 2013-05-15 09:38:51Z gcosmo $
>> 29 //
>> 30 //
>> 31 //
>> 32 // class G4RKG3_Stepper
27 // 33 //
28 // Class description: 34 // Class description:
29 // 35 //
30 // Runga-Kutta integrator stepper from Geant3. << 36 // Integrator Runga-Kutta Stepper from Geant3.
31 << 37 //
32 // Created: J.Apostolakis, V.Grichine - 30.01. << 38 // History:
>> 39 // - Created. J.Apostolakis, V.Grichine - 30.01.97
33 // ------------------------------------------- 40 // -------------------------------------------------------------------
34 #ifndef G4RKG3_STEPPER_HH << 41
35 #define G4RKG3_STEPPER_HH << 42 #ifndef G4RKG3_Stepper_hh
>> 43 #define G4RKG3_Stepper_hh
36 44
37 #include "G4Types.hh" 45 #include "G4Types.hh"
38 #include "G4MagIntegratorStepper.hh" 46 #include "G4MagIntegratorStepper.hh"
39 #include "G4ThreeVector.hh" 47 #include "G4ThreeVector.hh"
40 48
41 class G4Mag_EqRhs; 49 class G4Mag_EqRhs;
42 50
43 class G4RKG3_Stepper : public G4MagIntegratorS 51 class G4RKG3_Stepper : public G4MagIntegratorStepper
44 { 52 {
45 public: << 53 public: // with description
46 54
47 G4RKG3_Stepper(G4Mag_EqRhs* EqRhs); << 55 G4RKG3_Stepper(G4Mag_EqRhs *EqRhs);
48 // Integrate over 6 variables only: pos 56 // Integrate over 6 variables only: position & velocity.
49 // Not implemented yet ! 57 // Not implemented yet !
50 58
51 ~G4RKG3_Stepper() override; << 59 ~G4RKG3_Stepper();
52 60
53 void Stepper( const G4double yIn[], 61 void Stepper( const G4double yIn[],
54 const G4double dydx[], 62 const G4double dydx[],
55 G4double h, 63 G4double h,
56 G4double yOut[], 64 G4double yOut[],
57 G4double yErr[] ) over << 65 G4double yErr[] );
58 // The method which must be provided, ev 66 // The method which must be provided, even if less efficient.
59 67
60 G4double DistChord() const override ; << 68 G4double DistChord() const ;
61 69
62 void StepNoErr( const G4double tIn[8], 70 void StepNoErr( const G4double tIn[8],
63 const G4double dydx[6], 71 const G4double dydx[6],
64 G4double Step, 72 G4double Step,
65 G4double tOut[8], 73 G4double tOut[8],
66 G4double B[3] ); 74 G4double B[3] );
67 // Integrator RK Stepper from G3 with on 75 // Integrator RK Stepper from G3 with only two field evaluation per
68 // Step. It is used in propagation initi 76 // Step. It is used in propagation initial Step by small substeps
69 // after solution error and delta geomet 77 // after solution error and delta geometry considerations.
70 // B[3] is magnetic field which is passe 78 // B[3] is magnetic field which is passed from substep to substep.
71 79
72 void StepWithEst( const G4double tIn[8], 80 void StepWithEst( const G4double tIn[8],
73 const G4double dydx[6], 81 const G4double dydx[6],
74 G4double Step, 82 G4double Step,
75 G4double tOut[8], 83 G4double tOut[8],
76 G4double& alpha2, 84 G4double& alpha2,
77 G4double& beta2, 85 G4double& beta2,
78 const G4double B1[3], 86 const G4double B1[3],
79 G4double B2[3] ); 87 G4double B2[3] );
80 // Integrator for RK from G3 with evalua << 88 // Integrator for RK from G3 with evaluation of error in solution and delta
81 // delta geometry based on naive similar << 89 // geometry based on naive similarity with the case of uniform magnetic field.
82 // magnetic field. <<
83 // B1[3] is input and is the first magn 90 // B1[3] is input and is the first magnetic field values
84 // B2[3] is output and is the final magn 91 // B2[3] is output and is the final magnetic field values.
85 92
86 inline G4int IntegratorOrder() const overr << 93 public: // without description
>> 94
>> 95 G4int IntegratorOrder() const { return 4; }
87 96
88 private: 97 private:
89 98
90 G4ThreeVector fyInitial, 99 G4ThreeVector fyInitial,
91 fyMidPoint, 100 fyMidPoint,
92 fyFinal; 101 fyFinal;
93 G4ThreeVector fpInitial; << 102 G4ThreeVector fpInitial;
94 G4ThreeVector BfldIn; << 103 G4ThreeVector BfldIn;
95 G4double hStep = 0.0; << 104 G4double hStep;
96 }; 105 };
97 106
98 #endif 107 #endif
99 108