Hall A Vacuum System

The Hall A vacuum system consists of 5 separate but interconnected subsystems. The largest is designed to supply the Hall A HRS with a self contained 5 $\times$ 10$^{-6}$ Torr vacuum that enables both spectrometers to be pumped down from atm. in a few hours. The target vacuum system is designed to maintain a 1 $\times$ 10$^{-6}$ Torr in order to minimize contamination and provide an insulating vacuum for the cryo target. Rough insulating vacuum for the 4 superconducting magnets is provided by a 360 $cfm$ Roots type blower that can be connected to each magnet. The beam line vacuum is maintained by 1 $\ell$/s ion pump system used in the accelerator ring and a small turbo pump located near the target. The final subsystem is a differential pumping station located near the target exit port.