Patent ID: 7453074
Filing Date: 2008-11-18
Classification: H01J

Abstract:
1. An ion implanter comprising: a) an ion source including an ionization chamber having an interior region for generating ions for use in creating an ion beam confined to a beam path; b) an implantation chamber having an evacuated interior region wherein a workpiece is positioned to intersect the ion beam; c) structure for accelerating and shaping the ion beam from the source to move along the beam path between the ion source and the implantation chamber; and d) an ionization chamber electrode having a front defining an elongated aperture for allowing ions to exit said ionization chamber and accelerate through a region in close proximity to said ionization chamber electrode including a rim having an outwardly facing rim surface spaced from the aperture, a flat border surface immediately adjacent the aperture in a plane closer to the interior region of the ionization chamber than the outwardly facing rim surface; and an intermediate transition surface between the border surface and the outwardly facing rim surface.