AVS 52nd International Symposium
    Vacuum Technology Tuesday Sessions
       Session VT-TuP

Paper VT-TuP10
A Summary and Status of the SNS Ring Vacuum Systems *

Tuesday, November 1, 2005, 4:00 pm, Room Exhibit Hall C&D

Session: Vacuum Technology Poster Session
Presenter: M. Mapes, Brookhaven National Laboratory
Authors: H. Hseuh, Brookhaven National Laboratory
M. Mapes, Brookhaven National Laboratory
l. Smart, Brookhaven National Laboratory
D. Weiss, Brookhaven National Laboratory
J. Rank, Brookhaven National Laboratory
R. Todd, Brookhaven National Laboratory
Correspondent: Click to Email
The Spallation Neutron Source (SNS) ring is designed to accumulate high intensity protons. The vacuum system consists of the High Energy Beam Transport (HEBT) line, Accumulator Ring and the Ring to Target Beam Transport (RTBT) line. The accumulator ring has a circumference of 248m with 4 arcs and 4 straight sections while the RTBT and HEBT have a total length of 350m of beam transport line. Ultrahigh vacuum of 10-9 Torr is required in the accumulator ring to minimize beam-residual gas ionization. To reduce the secondary electron yield (SEY) and the associated electron cloud instability, the ring vacuum chambers are coated with Titanium-Nitride (TiN). In order to reduce radiation exposure quick disconnect chain clamp flanges are used in some areas where radiation levels are expected to be high. This paper describes the design, fabrication, assembly, and vacuum processing of the ring and beam transport vacuum systems as well as the associated vacuum instrumentation. *Work performed under the auspices of the U.S. Department of Energy.