@article{oai:nifs-repository.repo.nii.ac.jp:00000366,
 author = {Motojima,  O. and Yamada,  H. and Komori,  A. and Ohyabu,  N. and Kawahata,  K. and Kaneko,  O. and Masuzaki,  S. and Ejiri,  A. and Emoto,  M. and Funaba,  H. and Goto,  M. and Ida,  K. and Idei,  H. and Inagaki,  S. and Inoue,  N. and Kado,  S. and Kubo,  S. and Kumazawa,  R. and Minami,  T. and Miyazawa,  J. and Morisaki,  T. and Morita,  S. and Murakami,  S. and Muto,  S. and Mutoh,  T. and Nagayama,  Y. and Nakamura,  Y. and Nakanishi,  H. and Narihara,  K. and Nishimura,  K. and Noda,  N. and Kobuchi,  T. and Ohdachi,  S. and Oka,  Y. and Osakabe,  M. and Ozaki,  T. and Peterson,  B.J. and Sagara,  A. and Sakakibara,  S. and Sakamoto,  R. and Sasao,  H. and Sasao,  M. and Sato,  K. and Sato,  M. and Seki,  T. and Shimozuma,  T. and Shoji,  M. and Suzuki,  H. and Takeiri,  Y. and Tanaka,  K. and Toi,  K. and Tokuzawa,  T. and Tsumori,  K. and Tsuzuki,  K. and Yamada,  I. and Yamaguchi,  S. and Yokoyama,  M. and Watanabe,  K.Y. and Watari,  T. and Hamada,  Y. and Matsuoka,  K. and Murai,  K. and Ohkubo,  K. and Ohtake,  I. and Okamoto,  M. and Satoh,  S. and Satow,  T. and Sudo,  S. and Tanahashi,  S. and Yamazaki,  K. and Fujiwara,  M. and Iiyoshi,  A.},
 issue = {Issue5},
 journal = {Physics of Plasmas},
 month = {May},
 note = {The Large Helical Device (LHD) experiments [O. Motojima, et al., Proceedings, 16th Conference on Fusion Energy, Montreal, 1996 (International Atomic Energy Agency, Vienna, 1997), Vol. 3, p. 437] have started this year after a successful eight-year construction and test period of the fully superconducting facility. LHD investigates a variety of physics issues on large scale heliotron plasmas (R = 3.9 m, a = 0.6 m), which stimulates efforts to explore currentless and disruption-free steady plasmas under an optimized configuration. A magnetic field mapping has demonstrated the nested and healthy structure of magnetic surfaces, which indicates the successful completion of the physical design and the effectiveness of engineering quality control during the fabrication. Heating by 3 MW of neutral beam injection (NBI) has produced plasmas with a fusion triple product of 8 X 10^18 keV m^3 s at a magnetic field of 1.5 T. An electron temperature of 1.5 keV and an ion temperature of 1.4 keV have been achieved. The maximum stored energy has reached 0.22 MJ, which corresponds to <beta> = 0.7%, with neither unexpected confinement deterioration nor visible magnetohydrodynamics (MHD) instabilities. Energy confinement times, reaching 0.17 s at the maximum, have shown a trend similar to the present scaling law derived from the existing medium sized helical devices, but enhanced by 50%. The knowledge on transport, MHD, divertor, and long pulse operation, etc., are now rapidly increasing, which implies the successful progress of physics experiments on helical currentless-toroidal plasmas.},
 title = {Initial physics achievements of large helical device experiments},
 volume = {Vol.6},
 year = {1999}
}