Patent ID: 9745663
Date: 2017-08-29
CPC Classifications: B01J,C23C,C23F,H01J,H05H

Claim:
1. A plasma reactor comprising: a lid assembly, an axially symmetric side wall and a workpiece support defining a processing region; a first coil antenna facing said lid assembly and a second coil antenna facing one of: (a) said side wall and (b) said lid assembly, said first and second coil antennas being coaxial with said side wall, wherein said first and second coil antennas are of different diameters; plural RF power sources and plural current distributors coupled between respective ones of said first and second coil antennas and respective ones of said plural RF power sources, each of said current distributors comprising: (A) a hollow circular conductor coaxial with said side wall and defining a circularly continuous surface extending between top and bottom circular edges, (B) a top cap receiving portion extending radially inwardly from said top circular edge and coupled to a respective one of said plural RF power sources, said bottom circular edge coupled to the respective one of said coil antennas, and (C) an RF power feed, wherein respective ones of said current distributors and top cap receiving portions are of respective diameters corresponding to said different diameters of said first and second coil antennas with the current distributor of a greater diameter surrounding the current distributor and top cap receiving portion of a lesser diameter, and wherein the top cap receiving portion of at least one of the plural current distributors includes a plurality of radially extending azimuthally separated portions extending outward to connect the RF power feed of the respective current distributor to the hollow circular conductor of the respective current distributor; a chamber body defining an evacuation region and a central space sealed from said processing region and from said evacuation region, said central space enveloping at least a portion of said workpiece support; plural exhaust passages extending in an axial direction and coupled to said processing region and said evacuation region; and a vacuum pump port coupled to said evacuation region and centered relative to said side wall.