Improving the Bevatron Vacuum to 10-10 Torr

Pressure of ~10-10 torr is needed in the Bevatron to accelerate partially-stripped very-heavy ions (e.g. U69+) in the Bevatron without significant loss due to interactions with the residual gas. This ultra-high vacuum will be achieved by installing (summer and fall 1981) a cryogenic liner, mostly 12°K, surrounding the Bevatron circulating beam. The novel construction features are presented along with results from successful tests of prototype sections. This is believed to be the largest application of cryogenic pumping to particle accelerators yet undertaken.