Patent ID: 7422654
Filing Date: 2008-09-09
Classification: H01J

Abstract:
1. A magnetic field generator for generating a magnetic field within a semiconductor substrate processing system, comprising: a plurality of first coils that form a first magnetic field having a convex shape; and a plurality of second coils, positioned proximate to said plurality of first coils and having central axes that are not aligned with any central axes of the plurality of first coils, for providing a second magnetic field having a concave shape, where a combination of the first magnetic field and the second magnetic field form a magnetic field having a desired shape; wherein each coil of the plurality of first coils and the plurality of second coils is configured to produce a magnetic field having an axis that is radially aligned with a central axis about which the plurality of first coils and the plurality of second coils are arranged, and wherein each coil of the first coils overlaps with another first coil or each coil of the second coils overlaps with another second coil.