Patent ID: 8956461
Filing Date: 2015-02-17
Classification: B08B,H01J

Abstract:
1. A method for cleaning a confinement ring stack, comprising: providing a plasma chamber having a top electrode and a bottom electrode, the top electrode being disposed over the bottom electrode so as to define a first plasma processing region powered by a first plasma source and disposed between the top electrode and the bottom electrode, and the confinement ring stack being configured to move between a lower position and an upper position, the upper position being located above the top electrode and adjacent to a second plasma processing region powered by a second plasma source, the second plasma processing region being separate from the first plasma processing region and each plasma processing region being powered by a respective one of the first and second plasma sources; moving the confinement ring stack to the upper position; generating a cleaning plasma within the second plasma processing region and adjacent to an inner circumferential surface of the confinement ring stack when the confinement ring stack is in the upper position, the cleaning plasma being used to perform a cleaning operation on the confinement ring stack; and moving the confinement ring stack to the lower position when the cleaning operation using the cleaning plasma is finished, the confinement ring stack in the lower position defining a processing volume between the top electrode and the bottom electrode within the first plasma processing region.