Patent ID: 6280563
Filing Date: 2001-08-28
Classification: H01J

Abstract:
A plasma device comprising a vacuum chamber having a metal wall at a reference potential and a dielectric window, an AC excitation source for reactively coupling AC energy to the chamber, the AC excitation source including a coil having connections to be powered by an AC source, the coil being outside the chamber and arranged to derive an AC field coupled to the plasma through the dielectric window of the chamber, the AC energy when coupled to the chamber from the source being capable of interacting with ionizable material in the chamber to form a plasma, and a non-magnetic metal member interposed between the coil and the plasma, the non-magnetic metal member being arranged and constructed to pass AC electromagnetic fields from the coil to the plasma, the non-magnetic metal member being connected to a terminal of an electric source at a potential different from the reference potential.