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24 // ******************************************* 24 // ********************************************************************
25 // 25 //
26 // G4MonopoleEq implementation 26 // G4MonopoleEq implementation
27 // 27 //
28 // Created: V.Grichine, 17.11.2009 28 // Created: V.Grichine, 17.11.2009
29 // ------------------------------------------- 29 // -------------------------------------------------------------------
30 30
31 #include "G4MonopoleEq.hh" 31 #include "G4MonopoleEq.hh"
32 #include "globals.hh" 32 #include "globals.hh"
33 #include "G4PhysicalConstants.hh" 33 #include "G4PhysicalConstants.hh"
34 #include "G4SystemOfUnits.hh" 34 #include "G4SystemOfUnits.hh"
35 35
36 G4MonopoleEq::G4MonopoleEq(G4ElectroMagneticFi 36 G4MonopoleEq::G4MonopoleEq(G4ElectroMagneticField* emField )
37 : G4EquationOfMotion( emField ) 37 : G4EquationOfMotion( emField )
38 { 38 {
39 } 39 }
40 40
41 G4MonopoleEq::~G4MonopoleEq() = default; << 41 G4MonopoleEq::~G4MonopoleEq()
>> 42 {
>> 43 }
42 44
43 void 45 void
44 G4MonopoleEq::SetChargeMomentumMass(G4ChargeSt 46 G4MonopoleEq::SetChargeMomentumMass(G4ChargeState particleCharge, // e+ units
45 G4double, 47 G4double,
46 G4double p 48 G4double particleMass)
47 { 49 {
48 G4double pcharge = particleCharge.GetCharge( 50 G4double pcharge = particleCharge.GetCharge();
49 fElectroMagCof = eplus*pcharge; // no *c_l 51 fElectroMagCof = eplus*pcharge; // no *c_light as for ususal q
50 fElectroMagCof /= 2*fine_structure_const; 52 fElectroMagCof /= 2*fine_structure_const;
51 53
52 fMassCof = particleMass*particleMass ; 54 fMassCof = particleMass*particleMass ;
53 } 55 }
54 56
55 void 57 void
56 G4MonopoleEq::EvaluateRhsGivenB(const G4double 58 G4MonopoleEq::EvaluateRhsGivenB(const G4double y[],
57 const G4double 59 const G4double Field[],
58 G4double 60 G4double dydx[] ) const
59 { 61 {
60 62
61 // Components of y: 63 // Components of y:
62 // 0-2 dr/ds, 64 // 0-2 dr/ds,
63 // 3-5 d(pc)/ds - momentum derivatives 65 // 3-5 d(pc)/ds - momentum derivatives
64 66
65 G4double pSquared = y[3]*y[3] + y[4]*y[4] + 67 G4double pSquared = y[3]*y[3] + y[4]*y[4] + y[5]*y[5] ;
66 68
67 G4double Energy = std::sqrt( pSquared + f 69 G4double Energy = std::sqrt( pSquared + fMassCof );
68 G4double cof2 = Energy*c_light ; 70 G4double cof2 = Energy*c_light ;
69 71
70 G4double pModuleInverse = 1.0/std::sqrt(pS 72 G4double pModuleInverse = 1.0/std::sqrt(pSquared) ;
71 73
72 G4double inverse_velocity = Energy * pModul 74 G4double inverse_velocity = Energy * pModuleInverse / c_light;
73 75
74 G4double cof1 = fElectroMagCof*pModuleI 76 G4double cof1 = fElectroMagCof*pModuleInverse ;
75 77
76 dydx[0] = y[3]*pModuleInverse ; 78 dydx[0] = y[3]*pModuleInverse ;
77 dydx[1] = y[4]*pModuleInverse ; 79 dydx[1] = y[4]*pModuleInverse ;
78 dydx[2] = y[5]*pModuleInverse ; 80 dydx[2] = y[5]*pModuleInverse ;
79 81
80 dydx[3] = cof1*(cof2*Field[0] - (y[4]*Field 82 dydx[3] = cof1*(cof2*Field[0] - (y[4]*Field[5] - y[5]*Field[4])) ;
81 83
82 dydx[4] = cof1*(cof2*Field[1] - (y[5]*Field 84 dydx[4] = cof1*(cof2*Field[1] - (y[5]*Field[3] - y[3]*Field[5])) ;
83 85
84 dydx[5] = cof1*(cof2*Field[2] - (y[3]*Field 86 dydx[5] = cof1*(cof2*Field[2] - (y[3]*Field[4] - y[4]*Field[3])) ;
85 87
86 dydx[6] = 0.; //not used 88 dydx[6] = 0.; //not used
87 89
88 // Lab Time of flight 90 // Lab Time of flight
89 // 91 //
90 dydx[7] = inverse_velocity; 92 dydx[7] = inverse_velocity;
91 93
92 return; 94 return;
93 } 95 }
94 96