| Geant4 Cross Reference |
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24 // ******************************************* 21 // ********************************************************************
25 // 22 //
26 // G4Mag_UsualEqRhs implementation <<
27 // 23 //
28 // Created: J.Apostolakis, CERN - 13.01.1997 << 24 // $Id: G4Mag_UsualEqRhs.cc,v 1.4 2001/07/11 09:59:13 gunter Exp $
29 // ------------------------------------------- << 25 // GEANT4 tag $Name: geant4-04-00 $
30 << 26 //
>> 27 //
>> 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 // J. Apostolakis, January 13th, 1997
>> 35 //
31 #include "G4Mag_UsualEqRhs.hh" 36 #include "G4Mag_UsualEqRhs.hh"
32 #include "G4MagneticField.hh" <<
33 <<
34 #include "globals.hh" <<
35 <<
36 G4Mag_UsualEqRhs::G4Mag_UsualEqRhs( G4Magnetic <<
37 : G4Mag_EqRhs( MagField ) <<
38 { <<
39 } <<
40 <<
41 G4Mag_UsualEqRhs::~G4Mag_UsualEqRhs() = defaul <<
42 37
43 void 38 void
44 G4Mag_UsualEqRhs::EvaluateRhsGivenB( const G4d 39 G4Mag_UsualEqRhs::EvaluateRhsGivenB( const G4double y[],
45 const G4d << 40 const G4double B[3],
46 G4d << 41 G4double dydx[] ) const
47 { 42 {
48 G4double momentum_mag_square = y[3]*y[3] + << 43 G4double momentum_mag_square = sqr(y[3]) + sqr(y[4]) + sqr(y[5]);
49 G4double inv_momentum_magnitude = 1.0 / std << 44 G4double inv_momentum_magnitude = 1.0 / sqrt( momentum_mag_square );
50 45
51 G4double cof = FCof()*inv_momentum_magnitud 46 G4double cof = FCof()*inv_momentum_magnitude;
52 47
53 dydx[0] = y[3]*inv_momentum_magnitude; 48 dydx[0] = y[3]*inv_momentum_magnitude; // (d/ds)x = Vx/V
54 dydx[1] = y[4]*inv_momentum_magnitude; 49 dydx[1] = y[4]*inv_momentum_magnitude; // (d/ds)y = Vy/V
55 dydx[2] = y[5]*inv_momentum_magnitude; 50 dydx[2] = y[5]*inv_momentum_magnitude; // (d/ds)z = Vz/V
56 51
57 dydx[3] = cof*(y[4]*B[2] - y[5]*B[1]) ; / 52 dydx[3] = cof*(y[4]*B[2] - y[5]*B[1]) ; // Ax = a*(Vy*Bz - Vz*By)
58 dydx[4] = cof*(y[5]*B[0] - y[3]*B[2]) ; / 53 dydx[4] = cof*(y[5]*B[0] - y[3]*B[2]) ; // Ay = a*(Vz*Bx - Vx*Bz)
59 dydx[5] = cof*(y[3]*B[1] - y[4]*B[0]) ; / 54 dydx[5] = cof*(y[3]*B[1] - y[4]*B[0]) ; // Az = a*(Vx*By - Vy*Bx)
60 55
61 return; << 56 return ;
62 } 57 }
63 58
64 void <<
65 G4Mag_UsualEqRhs::SetChargeMomentumMass( G4Cha <<
66 G4dou <<
67 G4dou <<
68 59
69 { << 60
70 G4Mag_EqRhs::SetChargeMomentumMass( particl <<
71 } <<
72 61