@techreport{oai:nifs-repository.repo.nii.ac.jp:00009969,
 author = {Morita,  S. and Goto,  M. and Takeiri,  Y. and Miyazawa,  J. and Murakami,  S. and Narihara,  K. and Osakabe,  M. and Akiyama,  T. and Ashikawa,  N. and Emoto,  M. and Fujiwara,  M. and Funaba,  H. and Goncharov,  P. and Hamada,  Y. and Ida,  K. and Idei,  H. and Ido,  T. and Ikeda,  K. and Inagaki,  S. and Isobe,  M. and Itoh,  K. and Kaneko,  O. and Kawahata,  K. and Kawazome,  H. and Khlopenkov,  K. and Kobuchi,  T. and Komori,  A. and Kostrioukov,  A. and Kubo,  S. and Kumazawa,  R. and Liang,  Y. and Masuzaki,  S. and Matsuoka,  K. and Minami,  T. and Morisaki,  T. and Motojima,  O. and Muto,  S. and Mutoh,  T. and Nagayama,  Y. and Nakamura,  Y. and Nakanishi,  H. and Narushima,  Y. and Nishimura,  K. and Nishizawa,  A. and Noda,  N. and Notake,  T. and Nozato,  H. and Ohdachi,  S. and Ohkubo,  K. and Ohyabu,  N. and Oka,  Y. and Ozaki,  T. and Peterson,  B. J. and Sagara,  A. and Saida,  T. and Saito,  K. and Sakakibara,  S. and Sakamoto,  R. and Sasao,  M. and Sato,  K. and Sato,  M. and Satow,  T. and Seki,  T. and Shimozuma,  T. and Shoji,  M. and Sudo,  S. and Suzuki,  H. and Takeuchi,  N. and Tamura,  N. and Tanaka,  K. and Toi,  K. and Tokuzawa,  T. and Torii,  Y. and Uda,  T. and Watanabe,  K. Y. and Watari,  T. and Xu,  Y. and Yamada,  H. and Yamada,  I. and Yamamoto,  S. and Yamamoto,  T. and Yamazaki,  K. and Yokoyama,  M. and Yoshimura,  Y. and Tsumori,  K. and Yoshinuma,  M.},
 month = {Oct},
 note = {Ion heating experiments have been carried out in LHD using ECH (82.5, 84.0, 168GHz, leq 1MW), ICRF (38.5MHz, leq 2.7MW) and NBI (H^circ beam: 160keV, leq 8MW).  The central ion temperature has been obtained from Doppler broadening of TiXXI (2.61 angstrom) and ArXVII (3.95 angstrom) x-ray lines measured with a newly installed crystal spectrometer.  In ECH discharges on-axis heating was recently done with the appearance of high T_e(0) of 6-10keV and high ion temperature of 2.2keV was observed at n_e=0.6x10^13 cm^-3.  A clear increment of T_i was also observed with enhancement of the electron-ion energy flow when the ECH pulse was added to the NBI discharge.  These results demonstrate the feasibility toward ECH ignition.  The clear T_i increment was also observed in ICRF discharges at low density ranges of 0.4- 0.6 x 10^13 cm^-3 with appearance of a new operational range of T_i(0)=2.8keV>T_e(0)=1.9keV.  In the low power ICRF heating (1MW), the fraction of bulk ion heating is estimated to be 60% to the total ICRF input power, which means P_i>P_e.  Higher T_i(0) up to 3.5keV was obtained for a combined heating of NBI (<4MW) and ICRF (1MW) at density ranges of 0.5-1.5x10^13 cm^-3.  The highest T_i(0) of 5keV was recorded in Ne NBI discharges at n_e <1x10^13 cm^-3 with the achievement of T_i(0)>T_e(0), whereas the T_i(0) remained at relatively low values of 2keV in H_2 or He NBI discharges.  The main reasons for the high T_i acievement in the Ne descharge are; 1) 30% increment of deposition power, 2) increase in P_i / n_i (11 times, P_i / n_i >> P_e/n_e, P_i<P_e) and 3) increase in 促tau_ei (3 times).  The obtained T_i (0) data can be plotted by a smooth function of P_i / n_i.},
 title = {Study on Ion Temperature Behaviors in Electron and Ion Heating Regimes of ECH, ICRF and NBI Descharges in LHD},
 year = {2002}
}