Non-adiabatic effects in charged particle motion near a neutral line

Calculations of changes in magnetic moment of a particle passing near an X-type neutral line are discussed. The trapping of particles by these changes, in the low field region about the line, is considered, along with the effects of this trapping around magnetically guarded supports for internal ring machines. Previous calculations concerned particles confined to a symmetrical zone around the separatrices of the field or whose canonical momentum along the neutral line vanished. The present calculation is intended to remove this type of restriction.