Patent ID: 10056223

Abstract:
A plasma processing apparatus includes a lower electrode 12 on which a wafer W is provided. A second coolant path 70b is formed in a spiral shape in a region within the lower electrode 12 corresponding to where the wafer W is placed. Further, a first coolant path 70a is formed in a spiral shape to be located in a lower region within the lower electrode 12 corresponding to where the second coolant path 70b is formed. A pipeline 72 connected to a chiller unit 71 is branched into a first pipeline 72a connected to the first coolant path 70a and a second pipeline 72b connected to the second coolant path 70b. A check valve 90 allowing a coolant to flow in one direction is provided on the first pipeline 72a, and a reversing unit 92 reversing a flow direction of the coolant is provided on the pipeline 72.