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(FTP1/15) Achieved Capability of the Superconducting Magnet System for the Large Helical Device

T. Satow¹⁾, S. Imagawa¹⁾, N. Yanagi¹⁾, K. Takahata¹⁾, T. Mito¹⁾, S. Yamada¹⁾, H. Chikaraishi, A. Nishimura¹⁾, I. Ohtake¹⁾, Y. Nakamura¹⁾, S. Satoh¹⁾, O. Motojima^1)
 
1) National Institute for Fusion Science, Toki, Japan

Abstract.  The Large Helical Device (LHD) is a plasma physics experimental device with a magnetic stored energy of 960 MJ, consisting of two sc (superconducting) helical coils and six sc poloidal coils. The trial operation and the first plasma discharge of the eight-year Phase I project for LHD were finished on 31 March 1998 as initially planned. The second experimental campaign was conducted by additional heating using two NBI devices. The third campaign started in June 1999 and was finished in January 2000. Many plasma heating tests up to a plasma field of 2.90 T were carried out. Major test results on the sc magnet system for LHD are as follows: (1) The LHD cryogenic system succeeded in 13,400-hour operation and proved its high reliability. (2) A central field of 2.91 T at a radius of 3.60 m was achieved at an H-I current of 11.08 kA, H-M current of 11.83 kA and an H-O current of 12.02 kA. (3) All six poloidal coils were excited stably. (4) Nine flexible sc bus-lines with a total length of 497 m were operated stably and safe.

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