Abstract
The Advanced Limiter Test-II is a full toroidal belt pump limiter for the Tokamak Experiment for Technology Oriented Research (TEXTOR), consisting of eight curved blade segments that extend around the full circumference of the machine. The blades are supported at their ends from TEXTOR's Inconel liner by 16 worm gear screw jacks, which allow the positions of the limiter blades to be adjusted relative to the plasma centerline. Mechanical linkages and rotary feedthroughs link each jack to a drive motor outside the vacuum vessel. This allows the TEXTOR operators to adjust the positions of the blades remotely without opening the machine to the atmosphere. The lubricants and materials normally used in mechanical drive components are unacceptable in the tokamak environment. A prototype jack mechanism was designed and built with a Type 316L stainless steel housing and two sets of moving parts. The first set consisted of Nitronic 60 parts running against parts of aluminum bronze (CDA 642). The second set was made entirely of Nitronic 60. All running surfaces were coated with Dicronite, a WS/sub 2/ solid film lubricant. High vacuum, high temperature tests of these are reported in this paper.
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