Patent ID: 7045793
Filing Date: 2006-05-16
Classification: H01J

Abstract:
1. A grid optics system for extracting ions from a plasma source and propelling the ions toward a target in a substantially collimated ion beam directed along an axis extending between the plasma source and the target, the grid optics system comprising: a dished extraction grid spaced downstream from the plasma source along the axis and substantially normal to the axis; a dished acceleration grid spaced downstream from the extraction grid along the axis between the extraction grid and the target and substantially normal to the axis, the electrical extraction potential and the electrical acceleration potential operating in combination to extract the ions from the plasma source; a dished focus grid spaced downstream from the acceleration grid along and substantially normal to the axis between the acceleration grid and the target to focus the ions exiting the acceleration grid into a substantially collimated ion beam along the axis; and a dished shield grid spaced downstream from the focus grid along and substantially normal to the axis between the focus grid and the target to locate a neutralization plane near the shield grid.