Abstract
The highest volume averaged beta values βt of 2.2% at Bt = 0.75 T (gas puff) and 2.4% at βt, = 1.3 T (pellet) in helical devices have been achieved in LHD. The βt dependence of MHD activities has been investigated in NBI plasmas. The n/m = 1/2 mode, excited in the core region, and the t = 1 resonant modes, in the peripheral region, have been observed. Both of the fluctuation amplitudes increase with βt and pressure gradient. The strong n/m = 1/2 mode, which affects the plasma profile, has been observed in high βt discharges, and the abrupt disappearance of the mode leads to restoration of the Te profile. Violent instabilities which terminate the plasma and degradation of global energy confinement have not been observed so far.
| Original language | English |
|---|---|
| Pages (from-to) | 1177-1183 |
| Number of pages | 7 |
| Journal | Nuclear Fusion |
| Volume | 41 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - Sep 1 2001 |
| Externally published | Yes |
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All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
- Condensed Matter Physics
Cite this
MHD characteristics in the high beta regime of the Large Helical Device. / Sakakibara, S.; Yamada, H.; Watanabe, K. Y.; Narushima, Y.; Toi, K.; Ohdachi, S.; Takechi, M.; Yamamoto, S.; Narihara, K.; Tanaka, K.; Ashikawa, N.; De Vries, P.; Emoto, M.; Funaba, H.; Goto, M.; Ida, K.; Idei, H.; Ikeda, K.; Inagaki, S.; Inoue, N.; Isobe, M.; Kado, S.; Kaneko, O.; Kawahata, K.; Khlopenkov, K.; Kobuchi, T.; Komori, A.; Kubo, S.; Kumazawa, R.; Liang, Y.; Masuzaki, S.; Minami, T.; Miyazawa, J.; Morisaki, T.; Morita, S.; Murakami, S.; Muto, S.; Mutoh, T.; Nagayama, Y.; Nakamura, Y.; Nakanishi, H.; Nishimura, K.; Noda, N.; Notake, T.; Ohyabu, N.; Oka, Y.; Osakabe, M.; Ozaki, T.; Pavlichenko, R. O.; Peterson, B. J.; Sagara, A.; Saito, K.; Sakamoto, R.; Sasao, H.; Sasao, M.; Sato, K.; Sato, M.; Seki, T.; Shimozuma, T.; Shoji, M.; Suzuki, H.; Takeiri, Y.; Tamura, N.; Tokuzawa, T.; Torii, Y.; Tsumori, K.; Yamada, I.; Yamaguchi, S.; Yokoyama, M.; Yoshimura, Y.; Watari, T.; Nakajima, N.; Ichiguchi, K.; Takahashi, H.; Cooper, A. W.; Yamazaki, K.; Motojima, O.; Hamada, Y.; Fujiwara, M.
In: Nuclear Fusion, Vol. 41, No. 9, 01.09.2001, p. 1177-1183.Research output: Contribution to journal › Article
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TY - JOUR
T1 - MHD characteristics in the high beta regime of the Large Helical Device
AU - Sakakibara, S.
AU - Yamada, H.
AU - Watanabe, K. Y.
AU - Narushima, Y.
AU - Toi, K.
AU - Ohdachi, S.
AU - Takechi, M.
AU - Yamamoto, S.
AU - Narihara, K.
AU - Tanaka, K.
AU - Ashikawa, N.
AU - De Vries, P.
AU - Emoto, M.
AU - Funaba, H.
AU - Goto, M.
AU - Ida, K.
AU - Idei, H.
AU - Ikeda, K.
AU - Inagaki, S.
AU - Inoue, N.
AU - Isobe, M.
AU - Kado, S.
AU - Kaneko, O.
AU - Kawahata, K.
AU - Khlopenkov, K.
AU - Kobuchi, T.
AU - Komori, A.
AU - Kubo, S.
AU - Kumazawa, R.
AU - Liang, Y.
AU - Masuzaki, S.
AU - Minami, T.
AU - Miyazawa, J.
AU - Morisaki, T.
AU - Morita, S.
AU - Murakami, S.
AU - Muto, S.
AU - Mutoh, T.
AU - Nagayama, Y.
AU - Nakamura, Y.
AU - Nakanishi, H.
AU - Nishimura, K.
AU - Noda, N.
AU - Notake, T.
AU - Ohyabu, N.
AU - Oka, Y.
AU - Osakabe, M.
AU - Ozaki, T.
AU - Pavlichenko, R. O.
AU - Peterson, B. J.
AU - Sagara, A.
AU - Saito, K.
AU - Sakamoto, R.
AU - Sasao, H.
AU - Sasao, M.
AU - Sato, K.
AU - Sato, M.
AU - Seki, T.
AU - Shimozuma, T.
AU - Shoji, M.
AU - Suzuki, H.
AU - Takeiri, Y.
AU - Tamura, N.
AU - Tokuzawa, T.
AU - Torii, Y.
AU - Tsumori, K.
AU - Yamada, I.
AU - Yamaguchi, S.
AU - Yokoyama, M.
AU - Yoshimura, Y.
AU - Watari, T.
AU - Nakajima, N.
AU - Ichiguchi, K.
AU - Takahashi, H.
AU - Cooper, A. W.
AU - Yamazaki, K.
AU - Motojima, O.
AU - Hamada, Y.
AU - Fujiwara, M.
PY - 2001/9/1
Y1 - 2001/9/1
N2 - The highest volume averaged beta values βt of 2.2% at Bt = 0.75 T (gas puff) and 2.4% at βt, = 1.3 T (pellet) in helical devices have been achieved in LHD. The βt dependence of MHD activities has been investigated in NBI plasmas. The n/m = 1/2 mode, excited in the core region, and the t = 1 resonant modes, in the peripheral region, have been observed. Both of the fluctuation amplitudes increase with βt and pressure gradient. The strong n/m = 1/2 mode, which affects the plasma profile, has been observed in high βt discharges, and the abrupt disappearance of the mode leads to restoration of the Te profile. Violent instabilities which terminate the plasma and degradation of global energy confinement have not been observed so far.
AB - The highest volume averaged beta values βt of 2.2% at Bt = 0.75 T (gas puff) and 2.4% at βt, = 1.3 T (pellet) in helical devices have been achieved in LHD. The βt dependence of MHD activities has been investigated in NBI plasmas. The n/m = 1/2 mode, excited in the core region, and the t = 1 resonant modes, in the peripheral region, have been observed. Both of the fluctuation amplitudes increase with βt and pressure gradient. The strong n/m = 1/2 mode, which affects the plasma profile, has been observed in high βt discharges, and the abrupt disappearance of the mode leads to restoration of the Te profile. Violent instabilities which terminate the plasma and degradation of global energy confinement have not been observed so far.
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UR - http://www.scopus.com/inward/citedby.url?scp=0035470102&partnerID=8YFLogxK
U2 - 10.1088/0029-5515/41/9/306
DO - 10.1088/0029-5515/41/9/306
M3 - Article
AN - SCOPUS:0035470102
VL - 41
SP - 1177
EP - 1183
JO - Nuclear Fusion
JF - Nuclear Fusion
SN - 0029-5515
IS - 9
ER -