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24 // ******************************************* 21 // ********************************************************************
25 // 22 //
26 // G4EqMagElectricField implementation <<
27 // 23 //
28 // This is the standard right-hand side for eq << 24 // This is the standard right-hand side for equation of motion.
29 // 25 //
30 // The only case another is required is when u << 26 // The only case another is required is when using a moving reference
31 // frame ... or extending the class to include << 27 // frame ... or extending the class to include additional Forces,
32 // e.g., an electric field << 28 // eg an electric field
>> 29 //
>> 30 // 10.11.98 V.Grichine
33 // 31 //
34 // Created: V.Grichine, 10.11.1998 <<
35 // ------------------------------------------- <<
36 <<
37 #include "G4EqMagElectricField.hh" 32 #include "G4EqMagElectricField.hh"
38 #include "globals.hh" <<
39 #include "G4PhysicalConstants.hh" <<
40 #include "G4SystemOfUnits.hh" <<
41 <<
42 G4EqMagElectricField::G4EqMagElectricField(G4E <<
43 : G4EquationOfMotion( emField ) <<
44 { <<
45 } <<
46 <<
47 G4EqMagElectricField::~G4EqMagElectricField() <<
48 33
49 void 34 void
50 G4EqMagElectricField::SetChargeMomentumMass(G4 << 35 G4EqMagElectricField::SetChargeMomentumMass(G4double particleCharge, // e+ units
51 G4 << 36 G4double MomentumXc,
52 G4 37 G4double particleMass)
53 { 38 {
54 G4double pcharge = particleCharge.GetCharge << 39 fElectroMagCof = eplus*particleCharge*c_light ;
55 fElectroMagCof = eplus*pcharge*c_light ; <<
56 fMassCof = particleMass*particleMass ; 40 fMassCof = particleMass*particleMass ;
57 } 41 }
58 42
>> 43
>> 44
59 void 45 void
60 G4EqMagElectricField::EvaluateRhsGivenB(const 46 G4EqMagElectricField::EvaluateRhsGivenB(const G4double y[],
61 const << 47 const G4double Field[],
62 << 48 G4double dydx[] ) const
63 { 49 {
>> 50
64 // Components of y: 51 // Components of y:
65 // 0-2 dr/ds, 52 // 0-2 dr/ds,
66 // 3-5 dp/ds - momentum derivatives 53 // 3-5 dp/ds - momentum derivatives
67 54
68 G4double pSquared = y[3]*y[3] + y[4]*y[4] + 55 G4double pSquared = y[3]*y[3] + y[4]*y[4] + y[5]*y[5] ;
69 56
70 G4double Energy = std::sqrt( pSquared + f << 57 G4double cof2 = sqrt( pSquared + fMassCof )/c_light ;
71 G4double cof2 = Energy/c_light ; <<
72 <<
73 G4double pModuleInverse = 1.0/std::sqrt(pS <<
74 58
75 G4double inverse_velocity = Energy * pModul << 59 G4double pModuleInverse = 1.0/sqrt(pSquared) ;
76 60
77 G4double cof1 = fElectroMagCof*pModuleI 61 G4double cof1 = fElectroMagCof*pModuleInverse ;
78 62
>> 63 // G4double vDotE = y[3]*Field[3] + y[4]*Field[4] + y[5]*Field[5] ;
>> 64
>> 65
79 dydx[0] = y[3]*pModuleInverse ; 66 dydx[0] = y[3]*pModuleInverse ;
80 dydx[1] = y[4]*pModuleInverse ; 67 dydx[1] = y[4]*pModuleInverse ;
81 dydx[2] = y[5]*pModuleInverse ; 68 dydx[2] = y[5]*pModuleInverse ;
82 69
83 dydx[3] = cof1*(cof2*Field[3] + (y[4]*Field 70 dydx[3] = cof1*(cof2*Field[3] + (y[4]*Field[2] - y[5]*Field[1])) ;
84 71
85 dydx[4] = cof1*(cof2*Field[4] + (y[5]*Field 72 dydx[4] = cof1*(cof2*Field[4] + (y[5]*Field[0] - y[3]*Field[2])) ;
86 73
87 dydx[5] = cof1*(cof2*Field[5] + (y[3]*Field 74 dydx[5] = cof1*(cof2*Field[5] + (y[3]*Field[1] - y[4]*Field[0])) ;
88 << 75 return ;
89 dydx[6] = 0.;//not used <<
90 <<
91 // Lab Time of flight <<
92 // <<
93 dydx[7] = inverse_velocity; <<
94 <<
95 return; <<
96 } 76 }
97 77