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25 // 25 //
26 // G4EqMagElectricField implementation 26 // G4EqMagElectricField implementation
27 // 27 //
28 // This is the standard right-hand side for eq 28 // This is the standard right-hand side for equation of motion.
29 // 29 //
30 // The only case another is required is when u 30 // The only case another is required is when using a moving reference
31 // frame ... or extending the class to include 31 // frame ... or extending the class to include additional forces,
32 // e.g., an electric field 32 // e.g., an electric field
33 // 33 //
34 // Created: V.Grichine, 10.11.1998 34 // Created: V.Grichine, 10.11.1998
35 // ------------------------------------------- 35 // -------------------------------------------------------------------
36 36
37 #include "G4EqMagElectricField.hh" 37 #include "G4EqMagElectricField.hh"
38 #include "globals.hh" 38 #include "globals.hh"
39 #include "G4PhysicalConstants.hh" 39 #include "G4PhysicalConstants.hh"
40 #include "G4SystemOfUnits.hh" 40 #include "G4SystemOfUnits.hh"
41 41
42 G4EqMagElectricField::G4EqMagElectricField(G4E 42 G4EqMagElectricField::G4EqMagElectricField(G4ElectroMagneticField* emField )
43 : G4EquationOfMotion( emField ) 43 : G4EquationOfMotion( emField )
44 { 44 {
45 } 45 }
46 46
47 G4EqMagElectricField::~G4EqMagElectricField() 47 G4EqMagElectricField::~G4EqMagElectricField() = default;
48 48
49 void 49 void
50 G4EqMagElectricField::SetChargeMomentumMass(G4 50 G4EqMagElectricField::SetChargeMomentumMass(G4ChargeState particleCharge,
51 G4 51 G4double,
52 G4 52 G4double particleMass)
53 { 53 {
54 G4double pcharge = particleCharge.GetCharge 54 G4double pcharge = particleCharge.GetCharge();
55 fElectroMagCof = eplus*pcharge*c_light ; 55 fElectroMagCof = eplus*pcharge*c_light ;
56 fMassCof = particleMass*particleMass ; 56 fMassCof = particleMass*particleMass ;
57 } 57 }
58 58
59 void 59 void
60 G4EqMagElectricField::EvaluateRhsGivenB(const 60 G4EqMagElectricField::EvaluateRhsGivenB(const G4double y[],
61 const 61 const G4double Field[],
62 62 G4double dydx[] ) const
63 { 63 {
64 // Components of y: 64 // Components of y:
65 // 0-2 dr/ds, 65 // 0-2 dr/ds,
66 // 3-5 dp/ds - momentum derivatives 66 // 3-5 dp/ds - momentum derivatives
67 67
68 G4double pSquared = y[3]*y[3] + y[4]*y[4] + 68 G4double pSquared = y[3]*y[3] + y[4]*y[4] + y[5]*y[5] ;
69 69
70 G4double Energy = std::sqrt( pSquared + f 70 G4double Energy = std::sqrt( pSquared + fMassCof );
71 G4double cof2 = Energy/c_light ; 71 G4double cof2 = Energy/c_light ;
72 72
73 G4double pModuleInverse = 1.0/std::sqrt(pS 73 G4double pModuleInverse = 1.0/std::sqrt(pSquared) ;
74 74
75 G4double inverse_velocity = Energy * pModul 75 G4double inverse_velocity = Energy * pModuleInverse / c_light;
76 76
77 G4double cof1 = fElectroMagCof*pModuleI 77 G4double cof1 = fElectroMagCof*pModuleInverse ;
78 78
79 dydx[0] = y[3]*pModuleInverse ; 79 dydx[0] = y[3]*pModuleInverse ;
80 dydx[1] = y[4]*pModuleInverse ; 80 dydx[1] = y[4]*pModuleInverse ;
81 dydx[2] = y[5]*pModuleInverse ; 81 dydx[2] = y[5]*pModuleInverse ;
82 82
83 dydx[3] = cof1*(cof2*Field[3] + (y[4]*Field 83 dydx[3] = cof1*(cof2*Field[3] + (y[4]*Field[2] - y[5]*Field[1])) ;
84 84
85 dydx[4] = cof1*(cof2*Field[4] + (y[5]*Field 85 dydx[4] = cof1*(cof2*Field[4] + (y[5]*Field[0] - y[3]*Field[2])) ;
86 86
87 dydx[5] = cof1*(cof2*Field[5] + (y[3]*Field 87 dydx[5] = cof1*(cof2*Field[5] + (y[3]*Field[1] - y[4]*Field[0])) ;
88 88
89 dydx[6] = 0.;//not used 89 dydx[6] = 0.;//not used
90 90
91 // Lab Time of flight 91 // Lab Time of flight
92 // 92 //
93 dydx[7] = inverse_velocity; 93 dydx[7] = inverse_velocity;
94 94
95 return; 95 return;
96 } 96 }
97 97