The present invention provides a displacement detector for a relative displacement of a fixed member and a movable member, which includes a first member and a second member. The movable ground ring is configured to fit around and provide an RF return path to a fixed ground ring of the movable substrate support assembly in an adjustable gap capacitively-coupled plasma processing chamber wherein a semiconductor substrate supported in the substrate support assembly undergoes plasma processing. Both non-native and native server process share a library providing native program services. This synchronous operation may be, for example, a power on reset operation, a manufacturing test sequence, debug operation, or the like. The graphics engine sub-module accesses a second set of data that is indicative of a first physical-space measurement of the user. When the locking portions of the two opposite latches are closed, the locking portions engage with the corresponding engaging portions provided on the carrier main body to lock the carrier retaining member and the carrier base assembly.