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25 // 25 //
26 // G4MonopoleEq implementation <<
27 // 26 //
28 // Created: V.Grichine, 17.11.2009 << 27 // $Id: G4MonopoleEq.cc 69699 2013-05-13 08:50:30Z gcosmo $
>> 28 //
>> 29 //
>> 30 // This is the right-hand side for equation of motion for a
>> 31 // magnetic charge in a combined Electro-Magnetic field
>> 32 //
>> 33 // d(p_c)/ds=g{c-energyB_ - p_c x E}/pc
>> 34 //
>> 35 // 17.11.09 V.Grichine
>> 36 //
29 // ------------------------------------------- 37 // -------------------------------------------------------------------
30 38
31 #include "G4MonopoleEq.hh" 39 #include "G4MonopoleEq.hh"
32 #include "globals.hh" 40 #include "globals.hh"
33 #include "G4PhysicalConstants.hh" 41 #include "G4PhysicalConstants.hh"
34 #include "G4SystemOfUnits.hh" 42 #include "G4SystemOfUnits.hh"
35 43
36 G4MonopoleEq::G4MonopoleEq(G4ElectroMagneticFi <<
37 : G4EquationOfMotion( emField ) <<
38 { <<
39 } <<
40 <<
41 G4MonopoleEq::~G4MonopoleEq() = default; <<
42 <<
43 void 44 void
44 G4MonopoleEq::SetChargeMomentumMass(G4ChargeSt 45 G4MonopoleEq::SetChargeMomentumMass(G4ChargeState particleCharge, // e+ units
45 G4double, << 46 G4double,
46 G4double p 47 G4double particleMass)
47 { 48 {
48 G4double pcharge = particleCharge.GetCharge( 49 G4double pcharge = particleCharge.GetCharge();
49 fElectroMagCof = eplus*pcharge; // no *c_l 50 fElectroMagCof = eplus*pcharge; // no *c_light as for ususal q
50 fElectroMagCof /= 2*fine_structure_const; 51 fElectroMagCof /= 2*fine_structure_const;
51 52
52 fMassCof = particleMass*particleMass ; 53 fMassCof = particleMass*particleMass ;
53 } 54 }
54 55
>> 56
>> 57
55 void 58 void
56 G4MonopoleEq::EvaluateRhsGivenB(const G4double 59 G4MonopoleEq::EvaluateRhsGivenB(const G4double y[],
57 const G4double << 60 const G4double Field[],
58 G4double << 61 G4double dydx[] ) const
59 { 62 {
60 63
61 // Components of y: 64 // Components of y:
62 // 0-2 dr/ds, 65 // 0-2 dr/ds,
63 // 3-5 d(pc)/ds - momentum derivatives 66 // 3-5 d(pc)/ds - momentum derivatives
64 67
65 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] ;
66 69
67 G4double Energy = std::sqrt( pSquared + f 70 G4double Energy = std::sqrt( pSquared + fMassCof );
68 G4double cof2 = Energy*c_light ; 71 G4double cof2 = Energy*c_light ;
69 72
70 G4double pModuleInverse = 1.0/std::sqrt(pS 73 G4double pModuleInverse = 1.0/std::sqrt(pSquared) ;
71 74
>> 75 // G4double inverse_velocity = Energy * c_light * pModuleInverse;
72 G4double inverse_velocity = Energy * pModul 76 G4double inverse_velocity = Energy * pModuleInverse / c_light;
73 77
74 G4double cof1 = fElectroMagCof*pModuleI 78 G4double cof1 = fElectroMagCof*pModuleInverse ;
75 79
>> 80 // G4double vDotE = y[3]*Field[3] + y[4]*Field[4] + y[5]*Field[5] ;
>> 81
76 dydx[0] = y[3]*pModuleInverse ; 82 dydx[0] = y[3]*pModuleInverse ;
77 dydx[1] = y[4]*pModuleInverse ; 83 dydx[1] = y[4]*pModuleInverse ;
78 dydx[2] = y[5]*pModuleInverse ; 84 dydx[2] = y[5]*pModuleInverse ;
79 85
80 dydx[3] = cof1*(cof2*Field[0] - (y[4]*Field 86 dydx[3] = cof1*(cof2*Field[0] - (y[4]*Field[5] - y[5]*Field[4])) ;
81 87
82 dydx[4] = cof1*(cof2*Field[1] - (y[5]*Field 88 dydx[4] = cof1*(cof2*Field[1] - (y[5]*Field[3] - y[3]*Field[5])) ;
83 89
84 dydx[5] = cof1*(cof2*Field[2] - (y[3]*Field 90 dydx[5] = cof1*(cof2*Field[2] - (y[3]*Field[4] - y[4]*Field[3])) ;
85 91
86 dydx[6] = 0.; //not used << 92 dydx[6] = 0.;//not used
87 93
88 // Lab Time of flight 94 // Lab Time of flight
89 // <<
90 dydx[7] = inverse_velocity; 95 dydx[7] = inverse_velocity;
91 << 96 return ;
92 return; <<
93 } 97 }
94 98