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24 // ******************************************* 21 // ********************************************************************
25 // 22 //
26 // G4EqMagElectricField implementation <<
27 // 23 //
28 // This is the standard right-hand side for eq << 24 // $Id: G4EqMagElectricField.cc,v 1.12 2004/12/02 09:55:20 gcosmo Exp $
>> 25 // GEANT4 tag $Name: geant4-08-00 $
29 // 26 //
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 // 27 //
34 // Created: V.Grichine, 10.11.1998 << 28 // This is the standard right-hand side for equation of motion.
>> 29 //
>> 30 // The only case another is required is when using a moving reference
>> 31 // frame ... or extending the class to include additional Forces,
>> 32 // eg an electric field
>> 33 //
>> 34 // 10.11.98 V.Grichine
>> 35 //
35 // ------------------------------------------- 36 // -------------------------------------------------------------------
36 37
37 #include "G4EqMagElectricField.hh" 38 #include "G4EqMagElectricField.hh"
38 #include "globals.hh" 39 #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 40
49 void 41 void
50 G4EqMagElectricField::SetChargeMomentumMass(G4 << 42 G4EqMagElectricField::SetChargeMomentumMass(G4double particleCharge, // e+ units
51 G4 << 43 G4double,
52 G4 44 G4double particleMass)
53 { 45 {
54 G4double pcharge = particleCharge.GetCharge << 46 fElectroMagCof = eplus*particleCharge*c_light ;
55 fElectroMagCof = eplus*pcharge*c_light ; <<
56 fMassCof = particleMass*particleMass ; 47 fMassCof = particleMass*particleMass ;
57 } 48 }
58 49
>> 50
>> 51
59 void 52 void
60 G4EqMagElectricField::EvaluateRhsGivenB(const 53 G4EqMagElectricField::EvaluateRhsGivenB(const G4double y[],
61 const << 54 const G4double Field[],
62 << 55 G4double dydx[] ) const
63 { 56 {
>> 57
64 // Components of y: 58 // Components of y:
65 // 0-2 dr/ds, 59 // 0-2 dr/ds,
66 // 3-5 dp/ds - momentum derivatives 60 // 3-5 dp/ds - momentum derivatives
67 61
68 G4double pSquared = y[3]*y[3] + y[4]*y[4] + 62 G4double pSquared = y[3]*y[3] + y[4]*y[4] + y[5]*y[5] ;
69 63
70 G4double Energy = std::sqrt( pSquared + f 64 G4double Energy = std::sqrt( pSquared + fMassCof );
71 G4double cof2 = Energy/c_light ; 65 G4double cof2 = Energy/c_light ;
72 66
73 G4double pModuleInverse = 1.0/std::sqrt(pS 67 G4double pModuleInverse = 1.0/std::sqrt(pSquared) ;
74 68
>> 69 // G4double inverse_velocity = Energy * c_light * pModuleInverse;
75 G4double inverse_velocity = Energy * pModul 70 G4double inverse_velocity = Energy * pModuleInverse / c_light;
76 71
77 G4double cof1 = fElectroMagCof*pModuleI 72 G4double cof1 = fElectroMagCof*pModuleInverse ;
78 73
>> 74 // G4double vDotE = y[3]*Field[3] + y[4]*Field[4] + y[5]*Field[5] ;
>> 75
>> 76
79 dydx[0] = y[3]*pModuleInverse ; 77 dydx[0] = y[3]*pModuleInverse ;
80 dydx[1] = y[4]*pModuleInverse ; 78 dydx[1] = y[4]*pModuleInverse ;
81 dydx[2] = y[5]*pModuleInverse ; 79 dydx[2] = y[5]*pModuleInverse ;
82 80
83 dydx[3] = cof1*(cof2*Field[3] + (y[4]*Field 81 dydx[3] = cof1*(cof2*Field[3] + (y[4]*Field[2] - y[5]*Field[1])) ;
84 82
85 dydx[4] = cof1*(cof2*Field[4] + (y[5]*Field 83 dydx[4] = cof1*(cof2*Field[4] + (y[5]*Field[0] - y[3]*Field[2])) ;
86 84
87 dydx[5] = cof1*(cof2*Field[5] + (y[3]*Field 85 dydx[5] = cof1*(cof2*Field[5] + (y[3]*Field[1] - y[4]*Field[0])) ;
88 86
89 dydx[6] = 0.;//not used <<
90 <<
91 // Lab Time of flight 87 // Lab Time of flight
92 // <<
93 dydx[7] = inverse_velocity; 88 dydx[7] = inverse_velocity;
94 << 89 return ;
95 return; <<
96 } 90 }
97 91