Patent ID: 9695502
Date: 2017-07-04
CPC Classifications: C23C,H01J

Claim:
1. A process kit, comprising: a shield, comprising: a first ring, comprising: wherein the first ring is moveable between a first position, in which the first ring rests on the shield, and a second position, in which the first ring does not contact the shield, wherein a gap is formed between a radially outermost surface of the first protrusion and an adjacent inner surface of the one or more vertical sidewalls, wherein a width of the gap is less than about two plasma sheath widths for a plasma formed at a frequency of about 40 MHz or higher and at a pressure of about 140 mTorr or lower, wherein the gap has a length to width ratio of at least about 4:1 to limit or prevent plasma formation in the gap.