| Geant4 Cross Reference |
1 // 1 //
2 // ******************************************* 2 // ********************************************************************
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4 // * 4 // * *
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15 // * use. Please see the license in the file << 14 // * use. *
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17 // * 15 // * *
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19 // * technical work of the GEANT4 collaboratio << 17 // * GEANT4 collaboration. *
20 // * By using, copying, modifying or distri << 18 // * By copying, distributing or modifying the Program (or any work *
21 // * any work based on the software) you ag << 19 // * based on the Program) you indicate your acceptance of this *
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23 // * acceptance of all terms of the Geant4 Sof <<
24 // ******************************************* 21 // ********************************************************************
25 // 22 //
26 // G4RKG3_Stepper << 23 //
>> 24 // $Id: G4RKG3_Stepper.hh,v 1.10 2003/10/31 14:35:52 gcosmo Exp $
>> 25 // GEANT4 tag $Name: geant4-06-00-patch-01 $
>> 26 //
>> 27 //
>> 28 // class G4RKG3_Stepper
27 // 29 //
28 // Class description: 30 // Class description:
29 // 31 //
30 // Runga-Kutta integrator stepper from Geant3. << 32 // Integrator Runga-Kutta Stepper from Geant3.
31 33
32 // Created: J.Apostolakis, V.Grichine - 30.01. << 34 // History:
>> 35 // - Created. J.Apostolakis, V.Grichine - 30.01.97
33 // ------------------------------------------- 36 // -------------------------------------------------------------------
34 #ifndef G4RKG3_STEPPER_HH << 37
35 #define G4RKG3_STEPPER_HH << 38 #ifndef G4RKG3_Stepper_hh
>> 39 #define G4RKG3_Stepper_hh
36 40
37 #include "G4Types.hh" 41 #include "G4Types.hh"
38 #include "G4MagIntegratorStepper.hh" 42 #include "G4MagIntegratorStepper.hh"
39 #include "G4ThreeVector.hh" 43 #include "G4ThreeVector.hh"
40 44
41 class G4Mag_EqRhs; 45 class G4Mag_EqRhs;
42 46
43 class G4RKG3_Stepper : public G4MagIntegratorS 47 class G4RKG3_Stepper : public G4MagIntegratorStepper
44 { 48 {
45 public: << 49 public: // with description
46 50
47 G4RKG3_Stepper(G4Mag_EqRhs* EqRhs); << 51 G4RKG3_Stepper(G4Mag_EqRhs *EqRhs);
48 // Integrate over 6 variables only: pos 52 // Integrate over 6 variables only: position & velocity.
49 // Not implemented yet ! 53 // Not implemented yet !
50 54
51 ~G4RKG3_Stepper() override; << 55 ~G4RKG3_Stepper();
52 56
53 void Stepper( const G4double yIn[], 57 void Stepper( const G4double yIn[],
54 const G4double dydx[], 58 const G4double dydx[],
55 G4double h, 59 G4double h,
56 G4double yOut[], 60 G4double yOut[],
57 G4double yErr[] ) over << 61 G4double yErr[] );
58 // The method which must be provided, ev 62 // The method which must be provided, even if less efficient.
59 63
60 G4double DistChord() const override ; << 64 G4double DistChord() const ;
61 65
62 void StepNoErr( const G4double tIn[8], << 66 void StepNoErr( const G4double tIn[7],
63 const G4double dydx[6], << 67 const G4double dydx[7],
64 G4double Step, 68 G4double Step,
65 G4double tOut[8], << 69 G4double tOut[7],
66 G4double B[3] ); 70 G4double B[3] );
67 // Integrator RK Stepper from G3 with on 71 // Integrator RK Stepper from G3 with only two field evaluation per
68 // Step. It is used in propagation initi 72 // Step. It is used in propagation initial Step by small substeps
69 // after solution error and delta geomet 73 // after solution error and delta geometry considerations.
70 // B[3] is magnetic field which is passe 74 // B[3] is magnetic field which is passed from substep to substep.
71 75
72 void StepWithEst( const G4double tIn[8], << 76 void StepWithEst( const G4double tIn[7],
73 const G4double dydx[6], << 77 const G4double dydx[7],
74 G4double Step, 78 G4double Step,
75 G4double tOut[8], << 79 G4double tOut[7],
76 G4double& alpha2, 80 G4double& alpha2,
77 G4double& beta2, 81 G4double& beta2,
78 const G4double B1[3], 82 const G4double B1[3],
79 G4double B2[3] ); 83 G4double B2[3] );
80 // Integrator for RK from G3 with evalua << 84 // Integrator for RK from G3 with evaluation of error in solution and delta
81 // delta geometry based on naive similar << 85 // 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 86 // B1[3] is input and is the first magnetic field values
84 // B2[3] is output and is the final magn 87 // B2[3] is output and is the final magnetic field values.
85 88
86 inline G4int IntegratorOrder() const overr << 89 public: // without description
>> 90
>> 91 G4int IntegratorOrder() const { return 4; }
87 92
88 private: 93 private:
89 94
90 G4ThreeVector fyInitial, 95 G4ThreeVector fyInitial,
91 fyMidPoint, 96 fyMidPoint,
92 fyFinal; 97 fyFinal;
93 G4ThreeVector fpInitial; <<
94 G4ThreeVector BfldIn; <<
95 G4double hStep = 0.0; <<
96 }; 98 };
97 99
98 #endif 100 #endif
99 101