First cool-down performance of the LHD

Author

Mito, T. ; Maekawa, R. ; Yamada, S. ; Nishimura, A. ; Takahata, K. ; Iwamoto, A. ; Imagawa, S. ; Watanabe, K. ; Yanagi, N. ; Tamura, H. ; Baba, T. ; Moriuchi, S. ; Ohu, K. ; Sekiguchi, H. ; Ohtake, I. ; Satow, T. ; Satoh, S. ; Motojima, O.

Author_Institution

Nat. Inst. for Fusion Sci., Gifu, Japan

Volume

9

Issue

2

fYear

1999

fDate

6/1/1999 12:00:00 AM

Firstpage

640

Lastpage

643

Abstract

The first cool-down test of the Large Helical Device (LHD) and the performance of the LHD cryogenic system during the first cycle operation are described. The first cool-down started on Feb. 23, 1998 and finished on Mar. 22. After the cool-down, the excitation tests of the SC coils up to 1.5 T and the first cycle operations for plasma physics experiments were conducted until May 18. The first cycle operation was successfully completed after the warm-up process to room temperature from May 19 to Jun. 15. The cooling characteristics of the LHD, such as temperature distribution during cool-down, heat loads under steady state condition, reliability during long-term operation, are reported.

Keywords

cooling; cryogenics; fusion reactor design; fusion reactor materials; reliability; stellarators; superconducting coils; temperature distribution; 1.5 T; LHD; LHD cryogenic system; Large Helical Device; cool-down; cool-down performance; excitation tests; first cycle operation; heat loads; long-term operation; plasma physics experiments; reliability; room temperature; steady state condition; superconducting coils; temperature distribution; warm-up process; Coils; Cooling; Cryogenics; Physics; Plasma devices; Plasma properties; Plasma temperature; Steady-state; System testing; Temperature distribution;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.783377

Filename

783377