Patent ID: 6016036
Filing Date: 2000-01-18
Classification: H01J

Abstract:
A magnetic filter (90) for an ion source (26) comprising a housing defining a plasma confinement chamber (76) in which a plasma including ions is generated by ionizing a source material, the housing including a generally planar wall (50) in which are formed a plurality of elongated apertures (64) through which an ion beam (84) may be extracted from the plasma, the plurality of elongated openings oriented substantially parallel to each other and to a first axis (66) which lies within said planar wall, the first axis being substantially orthogonal to a second axis (68) which lies within the planar wall; said magnetic filter comprising:a plurality of elongated magnets (90a-90n) disposed within the plasma confinement chamber (76) for separating the plasma confinement chamber into a primary region (86) and a secondary region (88), said plurality of elongated magnets being oriented neither parallel to nor orthogonal to said second axis (68) but instead oriented at an acute angle .theta. as measured from said second axis (68) and lying parallel to each other and within a plane which is generally parallel to the generally planar wall (50).