| 著者 |
Morita, S.
Goto, M.
Takeiri, Y.
Miyazawa, J.
Murakami, S.
Narihara, K.
Osakabe, M.
Akiyama, T.
Ashikawa, N.
Emoto, M.
Fujiwara, M.
Funaba, H.
Goncharov, P.
Hamada, Y.
Ida, K.
Idei, H.
Ido, T.
Ikeda, K.
Inagaki, S.
Isobe, M.
Itoh, K.
Kaneko, O.
Kawahata, K.
Kawazome, H.
Khlopenkov, K.
Kobuchi, T.
Komori, A.
Kostrioukov, A.
Kubo, S.
Kumazawa, R.
Liang, Y.
Masuzaki, S.
Matsuoka, K.
Minami, T.
Morisaki, T.
Motojima, O.
Muto, S.
Mutoh, T.
Nagayama, Y.
Nakamura, Y.
Nakanishi, H.
Narushima, Y.
Nishimura, K.
Nishizawa, A.
Noda, N.
Notake, T.
Nozato, H.
Ohdachi, S.
Ohkubo, K.
Ohyabu, N.
Oka, Y.
Ozaki, T.
Peterson, B. J.
Sagara, A.
Saida, T.
Saito, K.
Sakakibara, S.
Sakamoto, R.
Sasao, M.
Sato, K.
Sato, M.
Satow, T.
Seki, T.
Shimozuma, T.
Shoji, M.
Sudo, S.
Suzuki, H.
Takeuchi, N.
Tamura, N.
Tanaka, K.
Toi, K.
Tokuzawa, T.
Torii, Y.
Uda, T.
Watanabe, K. Y.
Watari, T.
Xu, Y.
Yamada, H.
Yamada, I.
Yamamoto, S.
Yamamoto, T.
Yamazaki, K.
Yokoyama, M.
Yoshimura, Y.
Tsumori, K.
Yoshinuma, M.
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内容記述 |
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. |
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