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Author(s):
A. Iiyoshi, K. Yamazaki and the LHD Group
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Title:
Recent Studies of the Large Helical Device
Date of publication:
Nov. 1994
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Key words:
LHD, helical system, heliotron, stellarator, superconducting magnet
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Abstract:
The Large Helical Device (LHD) is presently under construcion (1990-1997) in NIFS, Japan. The magnetic configuration is chosen as an optimized heliotron with double helix coils, succeeding Heliotron-E, ATF and CHS. Target plasma parameters of the LHD with fully superconducting coil systems are; n tau _ET~10^20m^-3 bullet s bullet keV, bar {beta}=5% and steady operations with R_p=3.75m, a_p=50-65cm and B_0=3-4T. The major objectives of the LHD project are to demonstrate good plasma confinement, high beta achievement and steady-state divertor operation in the helical system. Various R & D results have been obtained on superconducting coils, negative ion source and special diagnostics for LHD. In our new site (Toki-city, Gifu-prefecture), the construction of the main experimental hall of the LHD Building was finished, and the winding of the helical coil has been started there. The construction of LHD will be completed in 1997.
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