Geant4 Cross Reference

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Geant4/geometry/magneticfield/src/G4Mag_UsualEqRhs.cc

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 25 //
 26 // G4Mag_UsualEqRhs implementation
 27 //
 28 // Created: J.Apostolakis, CERN - 13.01.1997
 29 // --------------------------------------------------------------------
 30 
 31 #include "G4Mag_UsualEqRhs.hh"
 32 #include "G4MagneticField.hh"
 33 
 34 #include "globals.hh"
 35 
 36 G4Mag_UsualEqRhs::G4Mag_UsualEqRhs( G4MagneticField* MagField )
 37   : G4Mag_EqRhs( MagField )
 38 {
 39 }
 40 
 41 G4Mag_UsualEqRhs::~G4Mag_UsualEqRhs() = default;
 42 
 43 void
 44 G4Mag_UsualEqRhs::EvaluateRhsGivenB( const G4double y[],
 45                                      const G4double B[3],
 46                                            G4double dydx[] ) const
 47 {
 48    G4double momentum_mag_square = y[3]*y[3] + y[4]*y[4] + y[5]*y[5];
 49    G4double inv_momentum_magnitude = 1.0 / std::sqrt( momentum_mag_square );
 50 
 51    G4double cof = FCof()*inv_momentum_magnitude;
 52 
 53    dydx[0] = y[3]*inv_momentum_magnitude;       //  (d/ds)x = Vx/V
 54    dydx[1] = y[4]*inv_momentum_magnitude;       //  (d/ds)y = Vy/V
 55    dydx[2] = y[5]*inv_momentum_magnitude;       //  (d/ds)z = Vz/V
 56 
 57    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]) ;   // Ay = a*(Vz*Bx - Vx*Bz)
 59    dydx[5] = cof*(y[3]*B[1] - y[4]*B[0]) ;   // Az = a*(Vx*By - Vy*Bx)
 60 
 61    return;
 62 }
 63 
 64 void
 65 G4Mag_UsualEqRhs::SetChargeMomentumMass( G4ChargeState particleCharge,
 66                                          G4double MomentumXc,
 67                                          G4double mass )
 68 
 69 {
 70    G4Mag_EqRhs::SetChargeMomentumMass( particleCharge, MomentumXc, mass);
 71 }
 72