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Geant4/geometry/magneticfield/src/G4Mag_UsualEqRhs.cc

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Differences between /geometry/magneticfield/src/G4Mag_UsualEqRhs.cc (Version 11.3.0) and /geometry/magneticfield/src/G4Mag_UsualEqRhs.cc (Version 9.2)


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 25 //                                                 25 //
 26 // G4Mag_UsualEqRhs implementation             << 
 27 //                                                 26 //
 28 // Created: J.Apostolakis, CERN - 13.01.1997   <<  27 // $Id: G4Mag_UsualEqRhs.cc,v 1.12 2006/06/29 18:24:42 gunter Exp $
                                                   >>  28 // GEANT4 tag $Name: geant4-09-02 $
                                                   >>  29 //
                                                   >>  30 //
                                                   >>  31 //  This is the 'standard' right-hand side for the equation of motion
                                                   >>  32 //  of a charged particle in a magnetic field.
                                                   >>  33 //
                                                   >>  34 //  Initial version: J. Apostolakis, January 13th, 1997
                                                   >>  35 //
 29 // -------------------------------------------     36 // --------------------------------------------------------------------
 30                                                    37 
 31 #include "G4Mag_UsualEqRhs.hh"                     38 #include "G4Mag_UsualEqRhs.hh"
 32 #include "G4MagneticField.hh"                      39 #include "G4MagneticField.hh"
 33                                                    40 
 34 #include "globals.hh"                          << 
 35                                                << 
 36 G4Mag_UsualEqRhs::G4Mag_UsualEqRhs( G4Magnetic     41 G4Mag_UsualEqRhs::G4Mag_UsualEqRhs( G4MagneticField* MagField )
 37   : G4Mag_EqRhs( MagField )                    <<  42   : G4Mag_EqRhs( MagField ) {}
 38 {                                              << 
 39 }                                              << 
 40                                                    43 
 41 G4Mag_UsualEqRhs::~G4Mag_UsualEqRhs() = defaul <<  44 G4Mag_UsualEqRhs::~G4Mag_UsualEqRhs() {}
 42                                                    45 
 43 void                                               46 void
 44 G4Mag_UsualEqRhs::EvaluateRhsGivenB( const G4d     47 G4Mag_UsualEqRhs::EvaluateRhsGivenB( const G4double y[],
 45                                      const G4d <<  48                    const G4double B[3],
 46                                            G4d <<  49                    G4double dydx[] ) const
 47 {                                                  50 {
 48    G4double momentum_mag_square = y[3]*y[3] +      51    G4double momentum_mag_square = y[3]*y[3] + y[4]*y[4] + y[5]*y[5];
 49    G4double inv_momentum_magnitude = 1.0 / std     52    G4double inv_momentum_magnitude = 1.0 / std::sqrt( momentum_mag_square );
 50                                                    53 
 51    G4double cof = FCof()*inv_momentum_magnitud     54    G4double cof = FCof()*inv_momentum_magnitude;
 52                                                    55 
 53    dydx[0] = y[3]*inv_momentum_magnitude;          56    dydx[0] = y[3]*inv_momentum_magnitude;       //  (d/ds)x = Vx/V
 54    dydx[1] = y[4]*inv_momentum_magnitude;          57    dydx[1] = y[4]*inv_momentum_magnitude;       //  (d/ds)y = Vy/V
 55    dydx[2] = y[5]*inv_momentum_magnitude;          58    dydx[2] = y[5]*inv_momentum_magnitude;       //  (d/ds)z = Vz/V
 56                                                    59 
 57    dydx[3] = cof*(y[4]*B[2] - y[5]*B[1]) ;   /     60    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]) ;   /     61    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]) ;   /     62    dydx[5] = cof*(y[3]*B[1] - y[4]*B[0]) ;   // Az = a*(Vx*By - Vy*Bx)
 60                                                    63 
 61    return;                                     <<  64    return ;
 62 }                                                  65 }
 63                                                    66 
 64 void                                               67 void
 65 G4Mag_UsualEqRhs::SetChargeMomentumMass( G4Cha <<  68 G4Mag_UsualEqRhs::
 66                                          G4dou <<  69  SetChargeMomentumMass( G4double particleCharge, // in e+ units
 67                                          G4dou <<  70                        G4double MomentumXc,
                                                   >>  71                        G4double mass)
 68                                                    72 
 69 {                                                  73 {
                                                   >>  74    fInvCurrentMomentumXc= 1.0 / MomentumXc;
 70    G4Mag_EqRhs::SetChargeMomentumMass( particl     75    G4Mag_EqRhs::SetChargeMomentumMass( particleCharge, MomentumXc, mass);
 71 }                                                  76 }
 72                                                    77