Abstract
A cryogenic upgrade has been completed for Fermilab's Tevatron acceleratorto lower the magnet temperature and increase the particle energy of the machine. Each satellite refrigerator uses a cold vapor compressor to pump on a subcooling dewar capable of lowering the magnet system's two-phase temperature to 3.56K. Larger wet expanders, subatmospheric modifications, and a new distributed control system were included in the design. A second Central Helium Liquefier with a 5400 liter/hour rated capacity was also brought on-line. Installation of the new lower temperature equipment and operating experiences during the Winter/Spring 1994 physics run including power tests are discussed.
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