Vacuum Pumping System

The vacuum in the target chamber is maintained by an Alcatel ( 880 l/s) turbomolecular vacuum pump. The pump is connected to a 6 $in$ port in the stainless steel ring between 130 $^\circ \le \theta_p \le 180 ^\circ$. The vacuum pump is fastened to a horizontal pipe connected to the chamber. The vacuum pressure in the chamber is about $10^{-5}$ mm. An additional Alcatel pump connected to an 8 $in$ port should be added to obtain lower vacuum. Both pumps may be isolated from the target chamber using gate valves which are remotely operated from the vacuum control rack and interlocked to the FSD system.

A 2 $in$ all metal gate valve is located between the entrance flange to the chamber and the beam profile monitor. An additional gate valve is located 2 m downstream of the target chamber to isolate the chamber from the exit beam pipe.