Abstract
A storage ring with a circumference of 45 m is being built at Brookhaven to measure the g-2 value of the muons to an accuracy of 0.35 ppm. The beam vacuum system of the storage ring will operate at 10−7 Torr and has to be completely nonmagnetic. It consists of 12 sector chambers. The chambers are constructed of aluminum alloy and are approximately 3.5 m in length with a rectangular cross section 16.5 cm high by 45 cm at the widest point. The design features, fabrication techniques, and cleaning methods for these chambers are described. The beam vacuum system will be pumped by 48 nonmagnetic distributed ion pumps with a total pumping speed of over 2000 ℓ/s. Monte Carlo simulations of the pressure distribution in the muon storage region are presented.
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