Patent ID: 7105839
Filing Date: 2006-09-12
Classification: H01J

Abstract:
1. In an ion implantation apparatus including a source for the generation of charged particles as an ion beam, a scanner which deflects the ion beam through a varying angle to yield a scanned ribbon beam, and a plane surface for the implantation of charged particles in the scanned ion beam into a workpiece which is moved through the scanned beam, the improvement of a fine-control collimator/steerer for accurate collimation and alignment of scanned beams, said fine-control collimator/steerer being comprised of: first and second multideflector sequence arrangements symmetrically encompassing the width of the scanned ribbon beam, wherein each said multideflector sequence arrangement comprises first on-demand controls for passing electrical energy of variable current independently and concurrently through each adjacently positioned coil deflector on each of said support bar of said first and second multideflector sequence arrangements, whereby second on-demand controls for passing electrical energy of variable current independently and concurrently through each said steering coil positioned at the ends of each said support bar whereby said steering coils become energized and generate an orthogonally extending magnetic field of limited breadth and an adjustable local magnetic potential gradient at each end of said linear support bar; a spatial channel bounded by said mulfideflector sequence arrangements for applying a contiguous magnetic field and a pre-selected magnetic field gradient profile to a scanned ion beam traveling therethrough, wherein the parallelism for a scanned ion beam becomes finely controlled and more accurate.