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1 // 1 //
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25 // 25 //
26 // G4RKG3_Stepper << 26 //
>> 27 // $Id: G4RKG3_Stepper.hh,v 1.11 2006/06/29 18:23:18 gunter Exp $
>> 28 // GEANT4 tag $Name: geant4-08-01-patch-01 $
>> 29 //
>> 30 //
>> 31 // class G4RKG3_Stepper
27 // 32 //
28 // Class description: 33 // Class description:
29 // 34 //
30 // Runga-Kutta integrator stepper from Geant3. << 35 // Integrator Runga-Kutta Stepper from Geant3.
31 36
32 // Created: J.Apostolakis, V.Grichine - 30.01. << 37 // History:
>> 38 // - Created. J.Apostolakis, V.Grichine - 30.01.97
33 // ------------------------------------------- 39 // -------------------------------------------------------------------
34 #ifndef G4RKG3_STEPPER_HH << 40
35 #define G4RKG3_STEPPER_HH << 41 #ifndef G4RKG3_Stepper_hh
>> 42 #define G4RKG3_Stepper_hh
36 43
37 #include "G4Types.hh" 44 #include "G4Types.hh"
38 #include "G4MagIntegratorStepper.hh" 45 #include "G4MagIntegratorStepper.hh"
39 #include "G4ThreeVector.hh" 46 #include "G4ThreeVector.hh"
40 47
41 class G4Mag_EqRhs; 48 class G4Mag_EqRhs;
42 49
43 class G4RKG3_Stepper : public G4MagIntegratorS 50 class G4RKG3_Stepper : public G4MagIntegratorStepper
44 { 51 {
45 public: << 52 public: // with description
46 53
47 G4RKG3_Stepper(G4Mag_EqRhs* EqRhs); << 54 G4RKG3_Stepper(G4Mag_EqRhs *EqRhs);
48 // Integrate over 6 variables only: pos 55 // Integrate over 6 variables only: position & velocity.
49 // Not implemented yet ! 56 // Not implemented yet !
50 57
51 ~G4RKG3_Stepper() override; << 58 ~G4RKG3_Stepper();
52 59
53 void Stepper( const G4double yIn[], 60 void Stepper( const G4double yIn[],
54 const G4double dydx[], 61 const G4double dydx[],
55 G4double h, 62 G4double h,
56 G4double yOut[], 63 G4double yOut[],
57 G4double yErr[] ) over << 64 G4double yErr[] );
58 // The method which must be provided, ev 65 // The method which must be provided, even if less efficient.
59 66
60 G4double DistChord() const override ; << 67 G4double DistChord() const ;
61 68
62 void StepNoErr( const G4double tIn[8], << 69 void StepNoErr( const G4double tIn[7],
63 const G4double dydx[6], << 70 const G4double dydx[7],
64 G4double Step, 71 G4double Step,
65 G4double tOut[8], << 72 G4double tOut[7],
66 G4double B[3] ); 73 G4double B[3] );
67 // Integrator RK Stepper from G3 with on 74 // Integrator RK Stepper from G3 with only two field evaluation per
68 // Step. It is used in propagation initi 75 // Step. It is used in propagation initial Step by small substeps
69 // after solution error and delta geomet 76 // after solution error and delta geometry considerations.
70 // B[3] is magnetic field which is passe 77 // B[3] is magnetic field which is passed from substep to substep.
71 78
72 void StepWithEst( const G4double tIn[8], << 79 void StepWithEst( const G4double tIn[7],
73 const G4double dydx[6], << 80 const G4double dydx[7],
74 G4double Step, 81 G4double Step,
75 G4double tOut[8], << 82 G4double tOut[7],
76 G4double& alpha2, 83 G4double& alpha2,
77 G4double& beta2, 84 G4double& beta2,
78 const G4double B1[3], 85 const G4double B1[3],
79 G4double B2[3] ); 86 G4double B2[3] );
80 // Integrator for RK from G3 with evalua << 87 // Integrator for RK from G3 with evaluation of error in solution and delta
81 // delta geometry based on naive similar << 88 // 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 89 // B1[3] is input and is the first magnetic field values
84 // B2[3] is output and is the final magn 90 // B2[3] is output and is the final magnetic field values.
85 91
86 inline G4int IntegratorOrder() const overr << 92 public: // without description
>> 93
>> 94 G4int IntegratorOrder() const { return 4; }
87 95
88 private: 96 private:
89 97
90 G4ThreeVector fyInitial, 98 G4ThreeVector fyInitial,
91 fyMidPoint, 99 fyMidPoint,
92 fyFinal; 100 fyFinal;
93 G4ThreeVector fpInitial; <<
94 G4ThreeVector BfldIn; <<
95 G4double hStep = 0.0; <<
96 }; 101 };
97 102
98 #endif 103 #endif
99 104