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The integration 36 // in constant magnetic field. The integration method is the same as in 32 // ClassicalRK4. The field value is assumed co 37 // ClassicalRK4. The field value is assumed constant for the step. 33 // This field evaluation is called only once p 38 // This field evaluation is called only once per step. 34 // G4ConstRK4 can be used only for magnetic fi 39 // G4ConstRK4 can be used only for magnetic fields. 35 40 36 // Created: J.Apostolakis, T.Nikitina - 18.09. << 41 // History: >> 42 // - 18.09.2008 - J.Apostolakis, T.Nikitina - Created 37 // ------------------------------------------- 43 // ------------------------------------------------------------------- >> 44 38 #ifndef G4CONSTRK4_HH 45 #ifndef G4CONSTRK4_HH 39 #define G4CONSTRK4_HH 46 #define G4CONSTRK4_HH 40 47 41 #include "G4MagErrorStepper.hh" 48 #include "G4MagErrorStepper.hh" 42 #include "G4EquationOfMotion.hh" 49 #include "G4EquationOfMotion.hh" 43 #include "G4Mag_EqRhs.hh" 50 #include "G4Mag_EqRhs.hh" 44 51 45 class G4ConstRK4 : public G4MagErrorStepper 52 class G4ConstRK4 : public G4MagErrorStepper 46 { 53 { 47 public: << 54 public: // with description 48 << 49 G4ConstRK4(G4Mag_EqRhs* EquationMotion, G << 50 ~G4ConstRK4() override; << 51 55 52 G4ConstRK4(const G4ConstRK4&) = delete; << 56 G4ConstRK4(G4Mag_EqRhs *EquationMotion, G4int numberOfVariables = 8); 53 G4ConstRK4& operator=(const G4ConstRK4&) << 57 ~G4ConstRK4(); 54 // Copy constructor and assignment oper << 55 58 56 void Stepper( const G4double y[], 59 void Stepper( const G4double y[], 57 const G4double dydx[], 60 const G4double dydx[], 58 G4double h, 61 G4double h, 59 G4double yout[], 62 G4double yout[], 60 G4double yerr[] ) ov << 63 G4double yerr[] ); 61 void DumbStepper( const G4double yIn[], << 64 void DumbStepper( const G4double yIn[], 62 const G4double dydx[], << 65 const G4double dydx[], 63 G4double h, << 66 G4double h, 64 G4double yOut[] ) << 67 G4double yOut[] ) ; 65 G4double DistChord() const override; << 68 G4double DistChord() const; 66 69 67 inline void RightHandSideConst(const G4d << 70 inline void RightHandSideConst(const G4double y[], 68 G4d << 71 G4double dydx[] ) const; 69 72 70 inline void GetConstField(const G4double << 73 inline void GetConstField(const G4double y[],G4double Field[]); >> 74 >> 75 public: // without description >> 76 >> 77 G4int IntegratorOrder() const { return 4; } >> 78 >> 79 private: 71 80 72 G4int IntegratorOrder() const override { << 81 G4ConstRK4(const G4ConstRK4&); >> 82 G4ConstRK4& operator=(const G4ConstRK4&); >> 83 // Private copy constructor and assignment operator. 73 84 74 private: 85 private: 75 86 76 G4ThreeVector fInitialPoint, fMidPoint, f 87 G4ThreeVector fInitialPoint, fMidPoint, fFinalPoint; 77 // Data stored in order to find the chord 88 // Data stored in order to find the chord 78 G4double *dydxm, *dydxt, *yt; // scratch 89 G4double *dydxm, *dydxt, *yt; // scratch space - not state 79 G4double *yInitial, *yMiddle, *dydxMid, * 90 G4double *yInitial, *yMiddle, *dydxMid, *yOneStep; 80 G4Mag_EqRhs* fEq = nullptr; << 91 G4Mag_EqRhs *fEq; 81 G4double Field[3]; 92 G4double Field[3]; 82 }; 93 }; 83 94 84 // Inline methods 95 // Inline methods 85 96 86 inline void G4ConstRK4::RightHandSideConst(con << 97 inline void G4ConstRK4:: RightHandSideConst(const G4double y[], 87 << 98 G4double dydx[] ) const 88 { 99 { 89 100 90 G4double momentum_mag_square = y[3]*y[3] + y 101 G4double momentum_mag_square = y[3]*y[3] + y[4]*y[4] + y[5]*y[5]; 91 G4double inv_momentum_magnitude = 1.0 / std: 102 G4double inv_momentum_magnitude = 1.0 / std::sqrt( momentum_mag_square ); 92 103 93 G4double cof = fEq->FCof()*inv_momentum_magn << 104 G4double cof =fEq->FCof()*inv_momentum_magnitude; 94 105 95 dydx[0] = y[3]*inv_momentum_magnitude; 106 dydx[0] = y[3]*inv_momentum_magnitude; // (d/ds)x = Vx/V 96 dydx[1] = y[4]*inv_momentum_magnitude; 107 dydx[1] = y[4]*inv_momentum_magnitude; // (d/ds)y = Vy/V 97 dydx[2] = y[5]*inv_momentum_magnitude; 108 dydx[2] = y[5]*inv_momentum_magnitude; // (d/ds)z = Vz/V 98 109 99 dydx[3] = cof*(y[4]*Field[2] - y[5]*Field[1] 110 dydx[3] = cof*(y[4]*Field[2] - y[5]*Field[1]) ; // Ax = a*(Vy*Bz - Vz*By) 100 dydx[4] = cof*(y[5]*Field[0] - y[3]*Field[2] 111 dydx[4] = cof*(y[5]*Field[0] - y[3]*Field[2]) ; // Ay = a*(Vz*Bx - Vx*Bz) 101 dydx[5] = cof*(y[3]*Field[1] - y[4]*Field[0] 112 dydx[5] = cof*(y[3]*Field[1] - y[4]*Field[0]) ; // Az = a*(Vx*By - Vy*Bx) 102 } 113 } 103 114 104 inline void G4ConstRK4::GetConstField(const G4 << 115 inline void G4ConstRK4::GetConstField(const G4double y[],G4double B[]) 105 { 116 { 106 G4double PositionAndTime[4]; << 117 G4double PositionAndTime[4]; 107 118 108 PositionAndTime[0] = y[0]; 119 PositionAndTime[0] = y[0]; 109 PositionAndTime[1] = y[1]; 120 PositionAndTime[1] = y[1]; 110 PositionAndTime[2] = y[2]; 121 PositionAndTime[2] = y[2]; 111 // Global Time 122 // Global Time 112 PositionAndTime[3] = y[7]; << 123 PositionAndTime[3] = y[7]; 113 fEq -> GetFieldValue(PositionAndTime, B); << 124 fEq -> GetFieldValue(PositionAndTime, B) ; 114 } 125 } 115 126 116 #endif << 127 #endif // G4CONSTRK4_HH 117 128