The vacuum in the target chamber is maintained by an Alcatel ( 880 liter/sec) turbomolecular vacuum pump. The pump is connected to a 6 in port in the stainless steel ring between . The vacuum pump is fastened to a horozontal 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. The present 6 in port should be enlarged to 8 in. A 2 in gate valve is located between the entrance flange to the chamber and the beam profile monitor and a 10 in gate valve is used to isolate Q1 from the target chamber. An additional gate valve is placed in the beam dump to isolate the chamber from the beam dump foil window.