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26 /// \file exoticphysics/monopole/src/G4Monopol 26 /// \file exoticphysics/monopole/src/G4MonopoleEquation.cc
27 /// \brief Implementation of the G4MonopoleEqu 27 /// \brief Implementation of the G4MonopoleEquation class
28 // 28 //
>> 29 // $Id: G4MonopoleEquation.cc 69705 2013-05-13 09:09:52Z gcosmo $
29 // 30 //
30 //....oooOO0OOooo........oooOO0OOooo........oo 31 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
31 //....oooOO0OOooo........oooOO0OOooo........oo 32 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
32 // 33 //
33 // 34 //
34 // class G4MonopoleEquation 35 // class G4MonopoleEquation
35 // 36 //
36 // Class description: 37 // Class description:
37 // 38 //
38 // 39 //
39 // This is the standard right-hand side for e 40 // This is the standard right-hand side for equation of motion.
40 // 41 //
41 // The only case another is required is when 42 // The only case another is required is when using a moving reference
42 // frame ... or extending the class to includ 43 // frame ... or extending the class to include additional Forces,
43 // eg an electric field 44 // eg an electric field
44 // 45 //
45 // 10.11.98 V.Grichine 46 // 10.11.98 V.Grichine
46 // 47 //
47 // 30.04.10 S.Burdin (modified to use for t 48 // 30.04.10 S.Burdin (modified to use for the monopole trajectories).
48 // 49 //
49 // 15.06.10 B.Bozsogi (replaced the hardcod 50 // 15.06.10 B.Bozsogi (replaced the hardcoded magnetic charge with
50 // the one passed by G4 51 // the one passed by G4MonopoleTransportation)
51 // +workaround to pass t 52 // +workaround to pass the electric charge.
52 // << 53 //
53 // 12.07.10 S.Burdin (added equations for th 54 // 12.07.10 S.Burdin (added equations for the electric charges)
54 // ------------------------------------------- 55 // -------------------------------------------------------------------
55 56
56 #include "G4MonopoleEquation.hh" 57 #include "G4MonopoleEquation.hh"
57 << 58 #include "globals.hh"
58 #include "G4PhysicalConstants.hh" 59 #include "G4PhysicalConstants.hh"
59 #include "G4SystemOfUnits.hh" 60 #include "G4SystemOfUnits.hh"
60 #include "globals.hh" <<
61 <<
62 #include <iomanip> 61 #include <iomanip>
63 62
64 //....oooOO0OOooo........oooOO0OOooo........oo 63 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
65 64
66 G4MonopoleEquation::G4MonopoleEquation(G4Magne << 65 G4MonopoleEquation::G4MonopoleEquation(G4ElectroMagneticField *emField )
67 { << 66 : G4EquationOfMotion( emField )
68 G4cout << "G4MonopoleEquation::G4MonopoleEqu << 67 {}
69 } <<
70 68
71 //....oooOO0OOooo........oooOO0OOooo........oo 69 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
72 70
73 G4MonopoleEquation::~G4MonopoleEquation() {} << 71 G4MonopoleEquation::~G4MonopoleEquation()
>> 72 {}
74 73
75 //....oooOO0OOooo........oooOO0OOooo........oo 74 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
76 75
77 void G4MonopoleEquation::SetChargeMomentumMass << 76 void
78 << 77 G4MonopoleEquation::SetChargeMomentumMass( G4ChargeState particleChargeState,
79 << 78 G4double , // momentum,
>> 79 G4double particleMass)
80 { 80 {
81 G4double particleMagneticCharge = particleCh << 81 G4double particleMagneticCharge= particleChargeState.MagneticCharge();
82 G4double particleElectricCharge = particleCh << 82 G4double particleElectricCharge= particleChargeState.GetCharge();
83 83
84 // fElCharge = particleElectricCharge; 84 // fElCharge = particleElectricCharge;
85 fElCharge = eplus * particleElectricCharge * << 85 fElCharge =eplus* particleElectricCharge*c_light;
86 << 86
87 fMagCharge = eplus * particleMagneticCharge << 87 fMagCharge = eplus*particleMagneticCharge*c_light ;
88 88
89 // G4cout << " G4MonopoleEquation: ElectricC 89 // G4cout << " G4MonopoleEquation: ElectricCharge=" << particleElectricCharge
90 // << "; MagneticCharge=" << parti 90 // << "; MagneticCharge=" << particleMagneticCharge
91 // << G4endl; 91 // << G4endl;
92 << 92
93 fMassCof = particleMass * particleMass; << 93 fMassCof = particleMass*particleMass ;
94 } 94 }
95 95
96 //....oooOO0OOooo........oooOO0OOooo........oo 96 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
97 97
98 void G4MonopoleEquation::EvaluateRhsGivenB(con << 98 void
99 G4d << 99 G4MonopoleEquation::EvaluateRhsGivenB(const G4double y[],
>> 100 const G4double Field[],
>> 101 G4double dydx[] ) const
100 { 102 {
101 // Components of y: 103 // Components of y:
102 // 0-2 dr/ds, << 104 // 0-2 dr/ds,
103 // 3-5 dp/ds - momentum derivatives << 105 // 3-5 dp/ds - momentum derivatives
104 <<
105 G4double pSquared = y[3] * y[3] + y[4] * y[4 <<
106 106
107 G4double Energy = std::sqrt(pSquared + fMass << 107 G4double pSquared = y[3]*y[3] + y[4]*y[4] + y[5]*y[5] ;
108 108
109 G4double pModuleInverse = 1.0 / std::sqrt(pS << 109 G4double Energy = std::sqrt( pSquared + fMassCof );
>> 110
>> 111 G4double pModuleInverse = 1.0/std::sqrt(pSquared);
110 112
111 G4double inverse_velocity = Energy * pModule 113 G4double inverse_velocity = Energy * pModuleInverse / c_light;
112 114
113 G4double cofEl = fElCharge * pModuleInverse; << 115 G4double cofEl = fElCharge * pModuleInverse ;
114 G4double cofMag = fMagCharge * Energy * pMod << 116 G4double cofMag = fMagCharge * Energy * pModuleInverse;
115 117
116 dydx[0] = y[3] * pModuleInverse; <<
117 dydx[1] = y[4] * pModuleInverse; <<
118 dydx[2] = y[5] * pModuleInverse; <<
119 118
120 // G4double magCharge = twopi * hbar_Planck << 119 dydx[0] = y[3]*pModuleInverse ;
>> 120 dydx[1] = y[4]*pModuleInverse ;
>> 121 dydx[2] = y[5]*pModuleInverse ;
>> 122
>> 123 // G4double magCharge = twopi * hbar_Planck / (eplus * mu0);
121 // magnetic charge in SI units A*m conventio 124 // magnetic charge in SI units A*m convention
122 // see http://en.wikipedia.org/wiki/Magneti << 125 // see http://en.wikipedia.org/wiki/Magnetic_monopole
123 // G4cout << "Magnetic charge: " << magC << 126 // G4cout << "Magnetic charge: " << magCharge << G4endl;
124 // dp/ds = dp/dt * dt/ds = dp/dt / v = Force 127 // dp/ds = dp/dt * dt/ds = dp/dt / v = Force / velocity
125 // dydx[3] = fMagCharge * Field[0] * invers << 128 // dydx[3] = fMagCharge * Field[0] * inverse_velocity * c_light;
126 // multiplied by c_light to convert to MeV/m 129 // multiplied by c_light to convert to MeV/mm
127 // dydx[4] = fMagCharge * Field[1] * in << 130 // dydx[4] = fMagCharge * Field[1] * inverse_velocity * c_light;
128 // dydx[5] = fMagCharge * Field[2] * in << 131 // dydx[5] = fMagCharge * Field[2] * inverse_velocity * c_light;
129 << 132
130 dydx[3] = cofMag * Field[0] + cofEl * (y[4] << 133 dydx[3] = cofMag * Field[0] + cofEl * (y[4]*Field[2] - y[5]*Field[1]);
131 dydx[4] = cofMag * Field[1] + cofEl * (y[5] << 134 dydx[4] = cofMag * Field[1] + cofEl * (y[5]*Field[0] - y[3]*Field[2]);
132 dydx[5] = cofMag * Field[2] + cofEl * (y[3] << 135 dydx[5] = cofMag * Field[2] + cofEl * (y[3]*Field[1] - y[4]*Field[0]);
133 << 136
134 // G4cout << std::setprecision(5)<< " 137 // G4cout << std::setprecision(5)<< "E=" << Energy
135 // << "; p="<< 1/pModuleInvers 138 // << "; p="<< 1/pModuleInverse
136 // << "; mC="<< magCharge 139 // << "; mC="<< magCharge
137 // <<"; x=" << y[0] 140 // <<"; x=" << y[0]
138 // <<"; y=" << y[1] 141 // <<"; y=" << y[1]
139 // <<"; z=" << y[2] 142 // <<"; z=" << y[2]
140 // <<"; dydx[3]=" << dydx[3] 143 // <<"; dydx[3]=" << dydx[3]
141 // <<"; dydx[4]=" << dydx[4] 144 // <<"; dydx[4]=" << dydx[4]
142 // <<"; dydx[5]=" << dydx[5] 145 // <<"; dydx[5]=" << dydx[5]
143 // << G4endl; 146 // << G4endl;
144 147
145 dydx[6] = 0.; // not used << 148 dydx[6] = 0.;//not used
146 << 149
147 // Lab Time of flight 150 // Lab Time of flight
148 dydx[7] = inverse_velocity; 151 dydx[7] = inverse_velocity;
149 return; 152 return;
150 } 153 }
151 154
152 //....oooOO0OOooo........oooOO0OOooo........oo 155 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
153 156