Patent ID: 11908665
Assignee: TOKYO ELECTRON LIMITED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A plasma processing apparatus, comprising:
a chamber;
a substrate support accommodated in the chamber;
an electric path coupled to or capacitively coupled to an edge ring on the substrate support;
a measuring device configured to measure an electrical characteristic value of the edge ring with a voltage applied to the edge ring on the substrate support through the electric path, the electrical characteristic value being variable in accordance with a thickness of the edge ring;
an adjuster configured to adjust an upper end position of a sheath above the edge ring; and
a controller configured to control the adjuster to reduce tilting of a recess in an edge of a substrate on the substrate support, the controller being configured to control the adjuster in accordance with the electrical characteristic value, or a thickness of the edge ring determined based on the electrical characteristic value or a decrease in the thickness of the edge ring determined based on the electrical characteristic value.