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25 // 25 //
26 // G4MonopoleEq implementation <<
27 // 26 //
28 // Created: V.Grichine, 17.11.2009 << 27 // $Id: G4MonopoleEq.cc,v 1.2 2010/03/18 10:23:29 japost Exp $
>> 28 // GEANT4 tag $Name: geant4-09-04 $
>> 29 //
>> 30 //
>> 31 // This is the right-hand side for equation of motion for a
>> 32 // magnetic charge in a combined Electro-Magnetic field
>> 33 //
>> 34 // d(p_c)/ds=g{c-energyB_ - p_c x E}/pc
>> 35 //
>> 36 // 17.11.09 V.Grichine
>> 37 //
29 // ------------------------------------------- 38 // -------------------------------------------------------------------
30 39
31 #include "G4MonopoleEq.hh" 40 #include "G4MonopoleEq.hh"
32 #include "globals.hh" 41 #include "globals.hh"
33 #include "G4PhysicalConstants.hh" <<
34 #include "G4SystemOfUnits.hh" <<
35 <<
36 G4MonopoleEq::G4MonopoleEq(G4ElectroMagneticFi <<
37 : G4EquationOfMotion( emField ) <<
38 { <<
39 } <<
40 <<
41 G4MonopoleEq::~G4MonopoleEq() = default; <<
42 42
43 void 43 void
44 G4MonopoleEq::SetChargeMomentumMass(G4ChargeSt << 44 G4MonopoleEq::SetChargeMomentumMass(G4double particleCharge, // e+ units
45 G4double, << 45 G4double,
46 G4double p << 46 G4double particleMass)
47 { 47 {
48 G4double pcharge = particleCharge.GetCharge( << 48 fElectroMagCof = eplus*particleCharge; // no *c_light as for ususal q
49 fElectroMagCof = eplus*pcharge; // no *c_l <<
50 fElectroMagCof /= 2*fine_structure_const; 49 fElectroMagCof /= 2*fine_structure_const;
51 50
52 fMassCof = particleMass*particleMass ; 51 fMassCof = particleMass*particleMass ;
53 } 52 }
54 53
>> 54
>> 55
55 void 56 void
56 G4MonopoleEq::EvaluateRhsGivenB(const G4double 57 G4MonopoleEq::EvaluateRhsGivenB(const G4double y[],
57 const G4double << 58 const G4double Field[],
58 G4double << 59 G4double dydx[] ) const
59 { 60 {
60 61
61 // Components of y: 62 // Components of y:
62 // 0-2 dr/ds, 63 // 0-2 dr/ds,
63 // 3-5 d(pc)/ds - momentum derivatives 64 // 3-5 d(pc)/ds - momentum derivatives
64 65
65 G4double pSquared = y[3]*y[3] + y[4]*y[4] + 66 G4double pSquared = y[3]*y[3] + y[4]*y[4] + y[5]*y[5] ;
66 67
67 G4double Energy = std::sqrt( pSquared + f 68 G4double Energy = std::sqrt( pSquared + fMassCof );
68 G4double cof2 = Energy*c_light ; 69 G4double cof2 = Energy*c_light ;
69 70
70 G4double pModuleInverse = 1.0/std::sqrt(pS 71 G4double pModuleInverse = 1.0/std::sqrt(pSquared) ;
71 72
>> 73 // G4double inverse_velocity = Energy * c_light * pModuleInverse;
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
>> 78 // G4double vDotE = y[3]*Field[3] + y[4]*Field[4] + y[5]*Field[5] ;
>> 79
76 dydx[0] = y[3]*pModuleInverse ; 80 dydx[0] = y[3]*pModuleInverse ;
77 dydx[1] = y[4]*pModuleInverse ; 81 dydx[1] = y[4]*pModuleInverse ;
78 dydx[2] = y[5]*pModuleInverse ; 82 dydx[2] = y[5]*pModuleInverse ;
79 83
80 dydx[3] = cof1*(cof2*Field[0] - (y[4]*Field 84 dydx[3] = cof1*(cof2*Field[0] - (y[4]*Field[5] - y[5]*Field[4])) ;
81 85
82 dydx[4] = cof1*(cof2*Field[1] - (y[5]*Field 86 dydx[4] = cof1*(cof2*Field[1] - (y[5]*Field[3] - y[3]*Field[5])) ;
83 87
84 dydx[5] = cof1*(cof2*Field[2] - (y[3]*Field 88 dydx[5] = cof1*(cof2*Field[2] - (y[3]*Field[4] - y[4]*Field[3])) ;
85 89
86 dydx[6] = 0.; //not used << 90 dydx[6] = 0.;//not used
87 91
88 // Lab Time of flight 92 // Lab Time of flight
89 // <<
90 dydx[7] = inverse_velocity; 93 dydx[7] = inverse_velocity;
91 << 94 return ;
92 return; <<
93 } 95 }
94 96