Title :
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
fDate :
30 Sep-3 Oct 1991
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;
Conference_Titel :
Fusion Engineering, 1991. Proceedings., 14th IEEE/NPSS Symposium on
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-0132-3
DOI :
10.1109/FUSION.1991.218650
