@techreport{oai:nifs-repository.repo.nii.ac.jp:00009565,
 author = {"Fujiwara,  M. and Yamada,  H. and Ejiri,  A. and Emoto,  M. and Funaba,  H. and Goto,  M. and Ida,  K. and Idei,  H. and Inagaki,  S. and Kado,  S. and Kaneko,  O. and Kawahata,  K. and Komori,  A. and Kubo,  S. and Kumazawa,  R. and Masuzaki,  S. and Minami,  T. and Miyazawa,  J. and Morisaki,  T. and Morita,  S. and Murakami,  S. and Muto,  S. and Muto,  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 Ohyabu,  N. 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 Sazuki,  H. and Takeiri,  Y. and Tanaka,  K. and Toi,  K. and Tokuzawa,  T. and Tsumori,  K. and Yamada,  I. and Yamaguchi,  S. and Yokoyama,  M. and Watanabe,  K. Y. and Watari,  T. and Akiyama,  R. and Chikaraishi,  H. and Haba,  K. and Hamaguchi,  S. and Iima,  M. and Imagawa,  S. and Inoue,  N. and Iwamoto,  K. and Kitagawa,  S. and Kubota,  Y. and Kodaira,  J. and Maekawa,  R. and Mito,  T. and Nagasaka,  T. and Nishimura,  A. and Takita,  Y. and Takahashi,  C. and Takahata,  K. and Yamauchi,  K. and Tamura,  H. and Tsuzuki,  T. and Yamada,  S. and Yanagi,  N. and Yonezu,  H. and Hamada,  Y. and Matsuoka,  K. and Murai,  K. and Ohkubo,  K. and Ohtake,  I. and Okamoto,  M. and Sato,  S. and Satow,  T. and Sudo,  S. and Tanahashi,  S. and Yamazaki,  K. and Motojima,  O. and Iiyoshi,  A."},
 month = {Oct},
 note = {"The initial experiments of the Large Helical Device (LHD) have extended confinement studies on currentless plasmas to a large scale (R=3.9 m, a = 0.6 m). Heating by NBI of 3 MW has produced plasmas with a fusion triple product of 8 x 10^18 keVm^-3s at a magnetic field of 1.5T. An electron temperature of 1.5 keV and an ion temperature of l.1 keV have been achieved simultaneously at the line-averaged electron density of 1.5 x 10^19 m^-3. The maximum stored energy has reached 0.22 MJ with neither unexpected confinement deterioration nor visible MHD instabilities, which corresponds to <beta> =0.7%.  Energy confinement times, reaching 0.17 s at the maximum, have shown a manner similar to the present scaling law derived from the existing medium sized helical devices, but improve on it by 50%. A distinguishing feature of a favorable dependence of energy confinement time on density remains in the present power density (~40kW/m^3) and the electron density (3x 10^19m^-3) regimes unlike L-mode in tokamaks. Temperatures of both electrons and ions as high as 200 eV have been observed at the outermost flux surface, which indicates a qualitative jump in performance from the helical devices to date. Spontaneously generated toroidal currents agree with the physical picture of neoclassical bootstrap currents. Change of magnetic configuration due to finite-beta eff'ect has been well described by the 3-D MHD equilibrium analysis. An escape of particles from the core region leading to a hollow density profile has been observed in hydrogen plasmas, which is mitigated through core fueling with a pellet injection or in helium discharges."},
 title = {Plasma Confinement Studies in LHD},
 year = {1998}
}