Patent ID: 6087614
Filing Date: 2000-07-11
Classification: H01J

Abstract:
A plasma processing system, which produces a plasma from a gas by means of electron cyclotron resonance and uses the plasma for processing a object to be treated, said plasma processing system comprising:a vacuum vessel provided with a transmission window of a dielectric material to transmit a high-frequency wave, and a stage disposed therein to support a wafer;a magnetic field creating means for creating a magnetic field in the vacuum vessel; anda high-frequency wave providing means for providing in a transverse magnetic (TM) mode a high-frequency wave of 2.45 GHz for producing a plasma in the vacuum vessel;wherein the high-frequency wave providing means includes a conical waveguide section expanding toward the transmission window and having an exit end in contact with the outer surface of the transmission window, andthe inside diameter of the exit end of the conical waveguide section is in the range of 130 to 160 mm.