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25 // 25 //
26 // G4EqMagElectricField implementation <<
27 // 26 //
28 // This is the standard right-hand side for eq << 27 // $Id: G4EqMagElectricField.cc,v 1.13 2006/06/29 18:23:46 gunter Exp $
>> 28 // GEANT4 tag $Name: geant4-08-01-patch-01 $
29 // 29 //
30 // The only case another is required is when u <<
31 // frame ... or extending the class to include <<
32 // e.g., an electric field <<
33 // 30 //
34 // Created: V.Grichine, 10.11.1998 << 31 // This is the standard right-hand side for equation of motion.
>> 32 //
>> 33 // The only case another is required is when using a moving reference
>> 34 // frame ... or extending the class to include additional Forces,
>> 35 // eg an electric field
>> 36 //
>> 37 // 10.11.98 V.Grichine
>> 38 //
35 // ------------------------------------------- 39 // -------------------------------------------------------------------
36 40
37 #include "G4EqMagElectricField.hh" 41 #include "G4EqMagElectricField.hh"
38 #include "globals.hh" 42 #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 43
49 void 44 void
50 G4EqMagElectricField::SetChargeMomentumMass(G4 << 45 G4EqMagElectricField::SetChargeMomentumMass(G4double particleCharge, // e+ units
51 G4 << 46 G4double,
52 G4 47 G4double particleMass)
53 { 48 {
54 G4double pcharge = particleCharge.GetCharge << 49 fElectroMagCof = eplus*particleCharge*c_light ;
55 fElectroMagCof = eplus*pcharge*c_light ; <<
56 fMassCof = particleMass*particleMass ; 50 fMassCof = particleMass*particleMass ;
57 } 51 }
58 52
>> 53
>> 54
59 void 55 void
60 G4EqMagElectricField::EvaluateRhsGivenB(const 56 G4EqMagElectricField::EvaluateRhsGivenB(const G4double y[],
61 const << 57 const G4double Field[],
62 << 58 G4double dydx[] ) const
63 { 59 {
>> 60
64 // Components of y: 61 // Components of y:
65 // 0-2 dr/ds, 62 // 0-2 dr/ds,
66 // 3-5 dp/ds - momentum derivatives 63 // 3-5 dp/ds - momentum derivatives
67 64
68 G4double pSquared = y[3]*y[3] + y[4]*y[4] + 65 G4double pSquared = y[3]*y[3] + y[4]*y[4] + y[5]*y[5] ;
69 66
70 G4double Energy = std::sqrt( pSquared + f 67 G4double Energy = std::sqrt( pSquared + fMassCof );
71 G4double cof2 = Energy/c_light ; 68 G4double cof2 = Energy/c_light ;
72 69
73 G4double pModuleInverse = 1.0/std::sqrt(pS 70 G4double pModuleInverse = 1.0/std::sqrt(pSquared) ;
74 71
>> 72 // G4double inverse_velocity = Energy * c_light * pModuleInverse;
75 G4double inverse_velocity = Energy * pModul 73 G4double inverse_velocity = Energy * pModuleInverse / c_light;
76 74
77 G4double cof1 = fElectroMagCof*pModuleI 75 G4double cof1 = fElectroMagCof*pModuleInverse ;
78 76
>> 77 // G4double vDotE = y[3]*Field[3] + y[4]*Field[4] + y[5]*Field[5] ;
>> 78
>> 79
79 dydx[0] = y[3]*pModuleInverse ; 80 dydx[0] = y[3]*pModuleInverse ;
80 dydx[1] = y[4]*pModuleInverse ; 81 dydx[1] = y[4]*pModuleInverse ;
81 dydx[2] = y[5]*pModuleInverse ; 82 dydx[2] = y[5]*pModuleInverse ;
82 83
83 dydx[3] = cof1*(cof2*Field[3] + (y[4]*Field 84 dydx[3] = cof1*(cof2*Field[3] + (y[4]*Field[2] - y[5]*Field[1])) ;
84 85
85 dydx[4] = cof1*(cof2*Field[4] + (y[5]*Field 86 dydx[4] = cof1*(cof2*Field[4] + (y[5]*Field[0] - y[3]*Field[2])) ;
86 87
87 dydx[5] = cof1*(cof2*Field[5] + (y[3]*Field 88 dydx[5] = cof1*(cof2*Field[5] + (y[3]*Field[1] - y[4]*Field[0])) ;
88 89
89 dydx[6] = 0.;//not used <<
90 <<
91 // Lab Time of flight 90 // Lab Time of flight
92 // <<
93 dydx[7] = inverse_velocity; 91 dydx[7] = inverse_velocity;
94 << 92 return ;
95 return; <<
96 } 93 }
97 94