MHD Instabilities and Their Effects on Plasma Confinement in the Large Helical Device Plasmas

"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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MHD Instabilities and Their Effects on Plasma Confinement in the Large Helical Device Plasmas

http://hdl.handle.net/10655/2883

Item type

研究報告書 / Research Paper(1)

公開日

2010-02-05

タイトル

MHD Instabilities and Their Effects on Plasma Confinement in the Large Helical Device Plasmas

言語

eng

キーワード

言語

主題Scheme

Other

主題

IAEA

キーワード

言語

主題Scheme

Other

主題

fusion energy conference

キーワード

言語

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

metadata only access

アクセス権URI

http://purl.org/coar/access_right/c_14cb

著者

"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."

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

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

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MHD Instabilities and Their Effects on Plasma Confinement in the Large Helical Device Plasmas

× "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.