Patent ID: 8241457

Claim:
A plasma processing system comprising: a processing chamber in which a desired process is applied to a target object using a plasma; a stage on which the target object is disposed in the processing chamber; a high-frequency power supply supplying high-frequency electric power to the stage; a capacitor provided inside the stage and connected to the high-frequency power supply in series; and a measurement device measuring voltages at a pair of plates of the capacitor when the high-frequency electric power is supplied from the high-frequency power supply to the stage, wherein, with a sheath capacitance C sheath being a predetermined ground sheath capacitance C 2 and a ratio of the predetermined ground sheath capacitance C 2 to an electrode-side sheath capacitance C 1 of the capacitor being ψ, a capacitor capacitance C is determined to allow 1+(ψ×C sheath 2 /{(1+ψ)×C sheath ×C})to be equal to or more than an electrode-voltage ratio that provides acceptable error in measurement of high frequency power immediately below the target object.