Mass spectrometry probe, particularly in magnetized plasma

摘要

This probe, which is to be placed in a uniform magnetic field, comprises an ion acceleration zone, a circular sector (6) polarized so as to create in the zone an accelerating electric field, an ion collector (8) , a conducting grid (36) at the entrance to the zone for fixing the potential at said entrance, the distance between said grid and the sector being adequate to ensure that the ions drift into the zone from their incidence position on the grid. The sector has an entrance slit (38) displaced with respect to said incidence position in order that the electric field is uniform in the acceleration zone.