Design of the advanced divertor pump cryogenic system for DIII-D

Author

Schaubel, K.M. ; Baxi, C.B. ; Campbell, G.L. ; Gootgeld, A.M. ; Langhorn, A.R. ; Laughon, G.J. ; Smith, J.P. ; Anderson, P.M. ; Menon, M.M.

Author_Institution

General Atomics, San Diego, CA, USA

fYear

1991

fDate

30 Sep-3 Oct 1991

Firstpage

1222

Abstract

The design of the cryogenic system for the DIII-D advanced divertor cryocondensation pump is presented. The advanced divertor incorporates a baffle chamber and bias ring located near the bottom of the DIII-D vacuum vessel. A 50000-l/s cryocondensation pump will be installed underneath the baffle for plasma particle exhaust. The pump consists of a liquid-helium-cooled tube operating at 4.3 K and a liquid-nitrogen-cooled radiation shield. Liquid helium is fed by forced flow through the cryopump. Compressed helium gas flowing through the high-pressure side of a heat exchanger is regeneratively cooled by the two-phase helium leaving the pump. The cooled high-pressure gaseous helium is then liquefied by a Joule-Thomson expansion valve. The liquid is returned to a storage dewar. The liquid nitrogen for the radiation shield is supplied by forced flow from a bulk storage system. Control of the cryogenic system is accomplished by a programmable logic controller

Keywords

Tokamak devices; fusion reactor theory and design; low-temperature production; DIII-D advanced divertor cryocondensation pump; Joule-Thomson expansion valve; baffle chamber; bias ring; cryogenic system; plasma particle exhaust; programmable logic controller; storage dewar; Bulk storage; Control systems; Cryogenics; Heat pumps; Helium; Laboratories; Nitrogen; Plasmas; Programmable control; Valves;

fLanguage

English

Publisher

ieee

Conference_Titel

Fusion Engineering, 1991. Proceedings., 14th IEEE/NPSS Symposium on

Conference_Location

San Diego, CA

Print_ISBN

0-7803-0132-3

Type

conf

DOI

10.1109/FUSION.1991.218650

Filename

218650