Construction of vacuum system for Tristan accumulation ring

Conference · Mon Aug 01 00:00:00 EDT 1983 · IEEE Trans. Nucl. Sci.; (United States)

OSTI ID:5330907

Ishimaru, H; Horikoshi, G; Kobayashi, M; Kubo, T; Mizuno, H; Momose, T; Narushima, K; Watanabe, H; Yamaguchi, H

An all aluminum-alloy vacuum system for the TRISTAN accumulation ring is now under construction. Aluminum and aluminum alloys are preferred materials for ultrahigh vacuum systems of large electron storage rings because of their good thermal conductivity, extremely low outgassing rate, and low residual radioactivity. Vacuum beam chambers for the dipole and quadrupole magnets are extruded using porthole dies. The aluminum alloy 6063-T6 provides superior performance in extrusion. For ultrahigh vacuum performance, a special extrusion technique is applied which, along with the outgassing procedure used, is described in detail. Aluminum alloy 3004 seamless elliptical bellows are inserted between the dipole and quadrupole magnet chambers. These bellows are produced by the hydraulic forming of a seamless tube. The seamless bellows and the beam chambers are joined by fully automatic welding. The ceramic chambers for the kicker magnets, the fast bump magnets, and the slow beam intensity monitor are inserted in the aluminum alloy beam chambers. The ceramic chamber (98% alumina) and elliptical bellows are brazed with brazing sheets (4003-3003-4003) in a vacuum furnace. The brazing technique is described. The inner surface of the ceramic chamber is coated with a TiMo alloy by vacuum evaporation to permit a smooth flow of the RF wall current. Other suitable aluminum alloy components, including fittings, feedthroughs, gauges, optical windows, sputter ion pumps, turbomolecular pumps, and valves have been developed; their fabrication is described.

• Research Organization: Nat.'l Lab. for High Energy Physics, Oho-machi, Tsukuba-gun, Ibaraki-ken 305
• OSTI ID: 5330907
• Report Number(s): CONF-830311-; TRN: 84-005753
• Journal Information: IEEE Trans. Nucl. Sci.; (United States), Vol. NS-30:4; Conference: Particle accelerator conference, Santa Fe, NM, USA, 21 Mar 1983
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
TRISTAN STORAGE RINGS
VACUUM SYSTEMS
ALUMINIUM ALLOYS
CONSTRUCTION
DEGASSING
FABRICATION
RADIOACTIVITY
STAINLESS STEELS
THERMAL CONDUCTIVITY
ALLOYS
CHROMIUM ALLOYS
CORROSION RESISTANT ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
PHYSICAL PROPERTIES
STEELS
STORAGE RINGS
THERMODYNAMIC PROPERTIES
430400* - Particle Accelerators- Storage Rings