Energy Doubler Refrigeration System
The design concept of a central liquefier supplying satellite stations as well as failure nudes will be discussed. Performance data will also be presented.
Long Removable Cryogenic Transfer Lines
Easily removable cryogenic transfer lines of lengths up to 63 feet have been successfully constructed and operated at the National Superconducting Cyclotron Laboratory. For the initial testing phase of the K-800 superconducting magnet, temporary lines which span a rather long distance between coil cryostat and a helium refrigerator were built. Eventually, a low heat load cryogenic distribution system will be constructed. The differential contraction between the cold inner pipe and ambient temperature outside vacuum jacket presents design problems for stainless steel bayonet transfer lines. The traditional solution to the contraction problems, contraction loops or bellows, usually results in a fixed line. Using the alloy Invar 36, which has a contraction coefficient ~ 1/8 of stainless steel, simple bayonet type transfer lines have been built. A lifting fixture is used for line installation.
Operation of the NAL Main Ring Extraction System
The NAL Main Ring extraction system has delivered both slow and fast extracted beam at 100, 200 and 300 GeV. Construction progress, operating conditions, instrumentation and beam characteristics are discussed.