Abstract: A system includes a plurality of spindle arms located above a plurality of stations in a processing chamber to transport a semiconductor substrate between the stations. The spindle arms reside in the processing chamber during processing of the semiconductor substrate. The system comprises first gas lines arranged below the stations to supply a purge gas. The system comprises second gas lines extending upwards from the first gas lines to supply the purge gas to the spindle arms during the processing of the semiconductor substrate in the processing chamber.

Abstract: A method comprises arranging an apparatus on a top surface of a pedestal in a processing chamber. The apparatus comprises an annular member, N supporting members, and N pins, where N is an integer greater than two. The N supporting members support the annular member in a plane parallel to and above the top surface of the pedestal. The N pins are arranged perpendicularly to the plane along a circumference around the annular member. Each of the N pins includes threads engageable with respective threaded slots in the apparatus. Each of the N pins includes a conical end pointing towards the top surface of the pedestal and engageable with a periphery of the top surface of the pedestal. The method further comprises aligning a center of the annular member to a center of the pedestal by adjusting one or more of the N pins.