Abstract
An average pressure of 3×10−10 Torr is required in order to store a beam of antiprotons (for up to 20 h) in the Fermilab Accumulator Ring. The Accumulator Ring has a circumference of 474 m and consists of 114 main magnets which surround a continuous, stainless‐steel vacuum chamber with a mean diameter of 12 cm. The Accumulator Ring is located in a below grade tunnel which is inaccessible during normal operation. Consequently, all monitoring and control operations must be done remotely. In this paper we describe: (1) the rationale of the Accumulator Ring’s vacuum system; (2) the specific choice of pumping systems (roughing, ion, and sublimation) that was selected for implementation; (3) the details of the instrumentation, control, and bakeout systems (300 °C) for monitoring the pressure and desorbing the vacuum chamber; and (4) the operating experience and performance of the entire system.
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