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In the RS configuration helical plasma, the reversed shear Alfv n eigenmode (RSAE) with n=1 toroidal mode number was identified together with energetic-ion-driven geodesic acoustic mode (GAM) with n=0. Temporal sweeping of the RSAE frequency was well-explained by ideal MHD theory without introducing non-perturbative energetic ion effects. The minimum value of RSAE frequency in the sweeping phase agrees well with GAM frequency. Nonlinear interaction between the RSAE and GAM generates a lot of driven modes. In thus produced low density RS configuration, bulk ion temperature in the plasma center T_io starts to increase linearly in time for more than 10 times of global energy confinement time just after the local minimum of the rotational transform has passed through the particular rational value ι/2π=1/3. When energetic ion driven AEs and GAM are re-excited appreciably, T_io decreases with slower time scale than that of the rise. During the rising phase of T_io, plasma potential measured by heavy ion beam probe becomes deeper in the plasma core region. Then, it becomes shallow in the decay phase of T_io.\"", "subitem_description_type": "Abstract"}]}, "item_5_source_id_10": {"attribute_name": "ISSN", "attribute_value_mlt": [{"subitem_source_identifier": "0915-633X", "subitem_source_identifier_type": "ISSN"}]}, "item_5_text_25": {"attribute_name": "登録情報", "attribute_value_mlt": [{"subitem_text_value": "Made available in DSpace on 2010-02-05T10:16:48Z (GMT). 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Alfv n Eigenmodes and Geodesic Acoustic Modes Driven by Energetic Ions in an LHD Plasma with Non-monotonic Rotational Transform Profile
http://hdl.handle.net/10655/2499
http://hdl.handle.net/10655/2499618c4b0f-c792-4a43-b213-7043db6bbc8e
Item type | 研究報告書 / Research Paper(1) | |||||
---|---|---|---|---|---|---|
公開日 | 2010-02-05 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Alfv n Eigenmodes and Geodesic Acoustic Modes Driven by Energetic Ions in an LHD Plasma with Non-monotonic Rotational Transform Profile | |||||
言語 | ||||||
言語 | eng | |||||
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.× Watanabe, F.× Tokuzawa, T.× Ida, K.× Morita, S.× Ido, T.× Shimizu, A.× Isobe, M.× Ogawa, K.× Spong, D.× Todo, Y.× Watari, T.× Ohdachi, S.× Sakakibara, S.× Yamamoto, S.× Inagaki, S.× Narihara, K.× Osakabe, M.× Nagaoka, K.× Narushima, Y.× WATANABE, K.W.× Funaba, H.× Goto, M.× Ikeda, K.× Ito, T.× Kaneko, O.× Kubo, S.× Minami, T.× Miyazawa, J.× Nagayama, Y.× Nishiura, M.× Oka, Y.× Sakamoto, R.× Shimozuma, T.× Takeiri, Y.× Tanaka, K.× Tsumori, K.× Yamada, I.× Yoshinuma, M.× Kawahata, K.× Komori, A.× LHD, experimental group" |
|||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | "In the Large Helical Device (LHD), a reversed magnetic shear (RS) configuration having non-monotonic rotational transform profile was formed by intense counter neutral beam (NB) current drive. In the RS configuration helical plasma, the reversed shear Alfv n eigenmode (RSAE) with n=1 toroidal mode number was identified together with energetic-ion-driven geodesic acoustic mode (GAM) with n=0. Temporal sweeping of the RSAE frequency was well-explained by ideal MHD theory without introducing non-perturbative energetic ion effects. The minimum value of RSAE frequency in the sweeping phase agrees well with GAM frequency. Nonlinear interaction between the RSAE and GAM generates a lot of driven modes. In thus produced low density RS configuration, bulk ion temperature in the plasma center T_io starts to increase linearly in time for more than 10 times of global energy confinement time just after the local minimum of the rotational transform has passed through the particular rational value ι/2π=1/3. When energetic ion driven AEs and GAM are re-excited appreciably, T_io decreases with slower time scale than that of the rise. During the rising phase of T_io, plasma potential measured by heavy ion beam probe becomes deeper in the plasma core region. Then, it becomes shallow in the decay phase of T_io." | |||||
書誌情報 |
en : Research Report NIFS-Series 発行日 2008-10-01 |
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報告書番号 | ||||||
NIFS-910 | ||||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0915-633X |