Patent ID: 9583318
Date: 2017-02-28
CPC Classifications: C23C,H01J,H01L

Claim:
1. A plasma processing apparatus of performing a plasma process with respect to substrates which are mounted on an upper surface of a rotary table installed within a vacuum container, while rotating the rotary table and consequently revolving the substrates, the apparatus comprising: a heater installed under the rotary table and configured to heat the substrates; a process gas supply part configured to supply a process gas toward the upper surface of the rotary table; an antenna configured to generate an inductively coupled plasma by converting the process gas to plasma; a light detection part configured to detect respective light intensities of an R component, a G component and a B component as light color components in a plasma generation region; a calculation part configured to obtain an evaluation value corresponding to a change amount before and after supplying a high-frequency power to the antenna, with respect to at least one of the respective light intensities of the R component, the G component and the B component detected by the light detection part; and an ignition determination part configured to compare the evaluation value obtained at the calculation part with a threshold value and to determine that ignition of plasma is not generated if the evaluation value does not exceed the threshold value, wherein the rotary table is made of a material which transmits light generated by the heater.