Summary

Tills paper describes the vacuum system for the beam-transport lines used with the L,awrence Liver-more L,aboratory 100-MeV electron-positron linear accelerator. It is operated in the high (10m4 to 10-5 Pa) range using star.dard ion pumps with turbo-m,?leca!ar pdmps ior roughdown. This paper also reviews the important factors considered during the inltlal design phases; these factors have contributed to the very reliable performance of the vacuum sys-tem smc~ ’ its startup five years ago. The cleaning and handling procedures used on the beam-transport lines, magnet vacu.Jm chambers, and other vacuum components are discussed. Vacuum System Description Psrtlclc accelerator systems have wide use i