Patent ID: 6777696
Filing Date: 2004-08-17
Classification: H01J

Abstract:
An acceleration structure suitable for use in implanting ions into a workpiece comprising:a first electrode having a first aperture formed therein; a second electrode having a second aperture formed therein, the first and second electrodes substantially parallel to one another and the first and second apertures aligned such that an axis substantially normal to the first and second electrodes passes through a gap defined between the first and second apertures and through the first and second apertures, wherein a potential developed between the first and second electrodes causes ions of an ion beam generally traveling along the axis to be accelerated or decelerated and converge depending upon biasing of the potential as an ion beam passes into the first aperture and out through the second aperture; a first mid-gap electrode located between the first and second electrodes and above the axis; and a second mid-gap electrode located between the first and second electrodes and below the axis, wherein a potential developed between the first and second mid-gap electrodes causes the ions within the ion beam to deflect away from the axis, wherein the first and second mid-gap electrodes have different widths and at least one of the first and second mid-gap electrodes have a non-planar surface facing the ion beam to facilitate control over the convergence of the ion beam, and wherein the acceleration structure is situated between an output of a mass analyzing beamline assembly and an input of an end station in an ion implantation system.