Patent ID: 9449793
Filing Date: 2016-09-20
CPC Classification: H01J

Claim Text:
1. A plasma source comprising: a ring plasma chamber having a plurality of gas inlet ports for receiving a process gas in the ring plasma chamber and a plurality of gas outlet ports that are vertically aligned with each of the plurality of gas inlet ports, the ring plasma chamber is a dielectric structure; a process gas plenum receiving the process gas from a gas inlet and distributing the process gas to the plurality of gas inlet ports; a primary winding having one or more turns around a circumference of the ring plasma chamber; a plurality of ferrites, wherein the ring plasma chamber passes through each of the plurality of ferrites, wherein each turn of the primary winding passes through an inside portion of each of the plurality of ferrites, wherein each turn of the primary winding has a length substantially equal to the circumference of the ring plasma chamber, wherein each of the plurality of ferrites has a substantial square shape and the ring plasma chamber has a rectangular cross-sectional shape, the substantial square shape of each of the plurality of ferrites fits around the rectangular cross-sectional shape of the ring plasma chamber; a chamber top for supporting the ring plasma chamber, the chamber top having a plurality of slots for holding the plurality of ferrites that are arranged around the ring plasma chamber, the ring plasma chamber being disposed above the chamber top and separated from the chamber top by a bottom portion of each of the plurality of ferrites having the substantial square shape; wherein the chamber top further including a plurality of plasma chamber outlets coupling the ring plasma chamber to a process chamber disposed below the chamber top, wherein each of the plurality of gas inlet ports and each of the plurality of gas outlet ports are aligned with respective ones of the plurality of plasma chamber outlets, wherein each one of the plurality plasma chamber outlets having a respective plasma restriction for defining a restricted flow of plasma into the process chamber; wherein each of the plurality of plasma chamber outlets in the chamber top has a cone shape opening that is wider on a side facing the process chamber.