Patent ID: 9355922
Filing Date: 2016-05-31
CPC Classification: C23C,H01J,H01L

Claim Text:
1. A method of conditioning one or more internal surfaces of a plasma source, comprising: flowing one or more first source gases into a plasma generation cavity of the plasma source, the plasma generation cavity being enclosed at least in part by the one or more internal surfaces, wherein: transmitting power into the plasma generation cavity by utilizing the internal surfaces as electrodes across which radio frequency (RF) power is connected, to generate a first plasma, wherein: flowing the first plasma products out of the plasma generation cavity by flowing the plasma products through perforations in a downstream one of the internal surfaces, toward a process chamber where a workpiece is processed by the first plasma products; flowing one or more second source gases into the plasma generation cavity; transmitting power into the plasma generation cavity to generate a second plasma, wherein capturing optical emissions from at least one of the first plasma and the second plasma through the optical port as an optical signal in a fiber optic; delivering the optical signal through the fiber optic to an optical emission spectrometer; and identifying emission peaks with the optical emission spectrometer to monitor the conditioning of the internal surfaces.