Patent ID: 11908662
Assignee: APPLIED MATERIALS, INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  C | IPC C  H

Claim 7:
8. An apparatus, comprising:
a support pedestal having a support surface;
a conductive mesh disposed in the support pedestal;
a faceplate disposed opposite the support surface;
a process volume defined at least partially by the support pedestal and the faceplate;
a first portion of a grounding bowl having an annular shape and surrounding the support pedestal opposite the process volume;
a second portion of the grounding bowl disposed radially outward of the first portion of the grounding bowl, the second portion of the grounding bowl configured to move selectively into and out of contact with a pumping plate;
a ledge formed into the second portion of the grounding bowl;
a purge gap formed between the first portion of the grounding bowl and the second portion of the grounding bowl adjacent to the support pedestal;
an annular liner surrounding the support pedestal and at least a portion of the first portion of the grounding bowl, the annular liner disposed in a recess of the pumping plate facing the process volume; and
a phase control circuit coupled to the faceplate and the conductive mesh.