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25 // 25 //
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 // 29 //
30 //....oooOO0OOooo........oooOO0OOooo........oo 30 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
31 //....oooOO0OOooo........oooOO0OOooo........oo 31 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
32 // 32 //
33 // 33 //
34 // class G4MonopoleEquation 34 // class G4MonopoleEquation
35 // 35 //
36 // Class description: 36 // Class description:
37 // 37 //
38 // 38 //
39 // This is the standard right-hand side for e 39 // This is the standard right-hand side for equation of motion.
40 // 40 //
41 // The only case another is required is when 41 // The only case another is required is when using a moving reference
42 // frame ... or extending the class to includ 42 // frame ... or extending the class to include additional Forces,
43 // eg an electric field 43 // eg an electric field
44 // 44 //
45 // 10.11.98 V.Grichine 45 // 10.11.98 V.Grichine
46 // 46 //
47 // 30.04.10 S.Burdin (modified to use for t 47 // 30.04.10 S.Burdin (modified to use for the monopole trajectories).
48 // 48 //
49 // 15.06.10 B.Bozsogi (replaced the hardcod 49 // 15.06.10 B.Bozsogi (replaced the hardcoded magnetic charge with
50 // the one passed by G4 50 // the one passed by G4MonopoleTransportation)
51 // +workaround to pass t 51 // +workaround to pass the electric charge.
52 // << 52 //
53 // 12.07.10 S.Burdin (added equations for th 53 // 12.07.10 S.Burdin (added equations for the electric charges)
54 // ------------------------------------------- 54 // -------------------------------------------------------------------
55 55
56 #include "G4MonopoleEquation.hh" 56 #include "G4MonopoleEquation.hh"
57 << 57 #include "globals.hh"
58 #include "G4PhysicalConstants.hh" 58 #include "G4PhysicalConstants.hh"
59 #include "G4SystemOfUnits.hh" 59 #include "G4SystemOfUnits.hh"
60 #include "globals.hh" <<
61 <<
62 #include <iomanip> 60 #include <iomanip>
63 61
64 //....oooOO0OOooo........oooOO0OOooo........oo 62 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
65 63
66 G4MonopoleEquation::G4MonopoleEquation(G4Magne << 64 G4MonopoleEquation::G4MonopoleEquation(G4MagneticField *emField )
>> 65 : G4EquationOfMotion( emField )
67 { 66 {
68 G4cout << "G4MonopoleEquation::G4MonopoleEqu 67 G4cout << "G4MonopoleEquation::G4MonopoleEquation" << G4endl;
69 } 68 }
70 69
71 //....oooOO0OOooo........oooOO0OOooo........oo 70 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
72 71
73 G4MonopoleEquation::~G4MonopoleEquation() {} << 72 G4MonopoleEquation::~G4MonopoleEquation()
>> 73 {}
74 74
75 //....oooOO0OOooo........oooOO0OOooo........oo 75 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
76 76
77 void G4MonopoleEquation::SetChargeMomentumMass << 77 void
78 << 78 G4MonopoleEquation::SetChargeMomentumMass( G4ChargeState particleChargeState,
79 << 79 G4double , // momentum,
>> 80 G4double particleMass)
80 { 81 {
81 G4double particleMagneticCharge = particleCh << 82 G4double particleMagneticCharge= particleChargeState.MagneticCharge();
82 G4double particleElectricCharge = particleCh << 83 G4double particleElectricCharge= particleChargeState.GetCharge();
83 84
84 // fElCharge = particleElectricCharge; 85 // fElCharge = particleElectricCharge;
85 fElCharge = eplus * particleElectricCharge * << 86 fElCharge =eplus* particleElectricCharge*c_light;
86 << 87
87 fMagCharge = eplus * particleMagneticCharge << 88 fMagCharge = eplus*particleMagneticCharge*c_light ;
88 89
89 // G4cout << " G4MonopoleEquation: ElectricC 90 // G4cout << " G4MonopoleEquation: ElectricCharge=" << particleElectricCharge
90 // << "; MagneticCharge=" << parti 91 // << "; MagneticCharge=" << particleMagneticCharge
91 // << G4endl; 92 // << G4endl;
92 << 93
93 fMassCof = particleMass * particleMass; << 94 fMassCof = particleMass*particleMass ;
94 } 95 }
95 96
96 //....oooOO0OOooo........oooOO0OOooo........oo 97 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
97 98
98 void G4MonopoleEquation::EvaluateRhsGivenB(con << 99 void
99 G4d << 100 G4MonopoleEquation::EvaluateRhsGivenB(const G4double y[],
>> 101 const G4double Field[],
>> 102 G4double dydx[] ) const
100 { 103 {
101 // Components of y: 104 // Components of y:
102 // 0-2 dr/ds, << 105 // 0-2 dr/ds,
103 // 3-5 dp/ds - momentum derivatives << 106 // 3-5 dp/ds - momentum derivatives
104 107
105 G4double pSquared = y[3] * y[3] + y[4] * y[4 << 108 G4double pSquared = y[3]*y[3] + y[4]*y[4] + y[5]*y[5] ;
106 109
107 G4double Energy = std::sqrt(pSquared + fMass << 110 G4double Energy = std::sqrt( pSquared + fMassCof );
108 << 111
109 G4double pModuleInverse = 1.0 / std::sqrt(pS << 112 G4double pModuleInverse = 1.0/std::sqrt(pSquared);
110 113
111 G4double inverse_velocity = Energy * pModule 114 G4double inverse_velocity = Energy * pModuleInverse / c_light;
112 115
113 G4double cofEl = fElCharge * pModuleInverse; << 116 G4double cofEl = fElCharge * pModuleInverse ;
114 G4double cofMag = fMagCharge * Energy * pMod << 117 G4double cofMag = fMagCharge * Energy * pModuleInverse;
115 <<
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