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MHD Instabilities and Their Effects on Plasma Confinement in the Large Helical Device Plasmas
http://hdl.handle.net/10655/2883
http://hdl.handle.net/10655/2883810a1c8c-ba8d-40a7-9ee1-5290a9bd9c39
Item type | 研究報告書 / Research Paper(1) | |||||
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公開日 | 2010-02-05 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | MHD Instabilities and Their Effects on Plasma Confinement in the Large Helical Device Plasmas | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | IAEA | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | fusion energy conference | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Lyon | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_18ws | |||||
資源タイプ | research report | |||||
アクセス権 | ||||||
アクセス権 | metadata only access | |||||
アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
著者 |
"Toi, K.
× "Toi, K.× Ohdachi, S.× Yamamotoa, S.× Nakajima, N.× Sakakibara, S.× Watanabe, K.Y.× Inagaki, S.× Nagayama, Y.× Narushima, Y.× Yamada, H.× Narihara, K.× Morita, S.× Akiyamab, T.× Ashikawa, N.× Dingc, X.× Emoto, M.× Funaba, H.× Goto, M.× Ida, K.× Idei, H.× Ido, T.× Ikeda, K.× Imagawa, S.× Isobe, M.× Itoh, K.× Kaneko, O.× Kawahata, K.× Kobuchi, T.× Komori, A.× Kubo, S.× Kumazawa, R.× Lid, J.× Liang, Y.× Masuzaki, S.× Mito, T.× Miyazawa, J.× Morisaki, T.× Murakami, S.× Muto, S.× Mutoh, T.× Nagaoka, K.× Nakamura, Y.× Nakanishi, H.× Nishimura, K.× Nishizawa, A.× Noda, N.× Notake, T.× Ohkubo, K.× Ohtake, I.× Ohyabu, N.× Oka, Y.× Okamura, S.× Ozaki, T.× Peterson, B.J.× Sagara, A.× Saidae, T.× Saito, K.× Sakamoto, R.× Sasao, M.× Sato, K.× Sato, M.× Satow, T.× Seki, T.× Shimozuma, T.× Shoji, M.× Sudo, S.× Tanaka, M.Y.× Tamurae, N.× Tanaka, K.× Tsumori, K.× Uda, T.× Watari, T.× Wellerf, A.× Xu, Y.× Yamada, I.× Yokoyama, M.× Yoshimura, S.× Yoshimura, Y.× Yamazaki, K.× Matsuoka, K.× Motojima, O.× Hamada, Y.× Fujiwara, M." |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | "Characteristic of MHD instabilities and their impacts on plasma confinement are studied in current free plasmas of the Large helical Device (LHD). Spontaneous L-H transition is often observed in high beta plasma in the range of 2% averaged beta at low toroidal field (B_t leq 0.6T). The stored energy rapidly rises by the transition, but quickly saturates by the growth of m=2/n=3 and m=2/n=2 modes (m and n:poloidal and toroidal mode numbers) excited in the plasma edge region. Even low beta plasmas, ELM like activities are sometimes induced in high performance plasmas with high edge pressure pedestal, and transiently reduce the stored energy by about 10%. Energetic ion driven MHD modes such as Alfven eigenmodes are studied in the very wide parameter range of the averaged beta of energetic ions < beta_bparallel > up to 5% and the ratio of energetic ion velocity to the alfvben velocity V_(bparallel)/V_A up to 2.5. In addition to the observation of toroidicity indued Alfven eigenmodes (TAEs), coherent magnetic fluctuations of helicity induced induced Alfven eigenmodes (HAEs) have been observed for the first time in NBI heated plasmas. Transition of TAE to global Alfven eigenmode(GAE) is also observed in a discharge with temporal evolution of the rotational transform profile, having a similarity to the phenomenon in a reversed shear tokamak. At the low magnetic field, bursting TAEs enhance energetic ion loss transiently, but lead to the transient improvement of bulk plasma confinement in the plasma central region." | |||||
書誌情報 |
en : Research Report NIFS-Series 発行日 2002-10-01 |
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報告書番号 | ||||||
NIFS-758 | ||||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0915-633X |