BEAM VACUUM-SYSTEM OF BROOKHAVENS MUON STORAGE-RING

A storage ring with a circumference of 45 m is being built at Brookhav en to measure the g-2 value of the muons to an accuracy of 0.35 ppm. T he beam vacuum system of the storage ring will operate at 10(-7) Torr and has to be completely nonmagnetic. It consists of 12 sector chamber s. The chambers are constructed of aluminum alloy and are approximatel y 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, a nd cleaning methods for these chambers are described. The beam vacuum system will be pumped by 48 nonmagnetic distributed ion pumps with a t otal pumping speed of over 2000 l/s. Monte Carlo simulations of the pr essure distribution in the muon storage region are presented. (C) 1996 American Vacuum Society.