WEKO3
アイテム
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Heating by NBI of 3 MW has produced plasmas with a fusion triple product of 8 x 10^18 keVm^-3s at a magnetic field of 1.5T. An electron temperature of 1.5 keV and an ion temperature of l.1 keV have been achieved simultaneously at the line-averaged electron density of 1.5 x 10^19 m^-3. The maximum stored energy has reached 0.22 MJ with neither unexpected confinement deterioration nor visible MHD instabilities, which corresponds to \u003cbeta\u003e =0.7%. Energy confinement times, reaching 0.17 s at the maximum, have shown a manner similar to the present scaling law derived from the existing medium sized helical devices, but improve on it by 50%. A distinguishing feature of a favorable dependence of energy confinement time on density remains in the present power density (~40kW/m^3) and the electron density (3x 10^19m^-3) regimes unlike L-mode in tokamaks. Temperatures of both electrons and ions as high as 200 eV have been observed at the outermost flux surface, which indicates a qualitative jump in performance from the helical devices to date. Spontaneously generated toroidal currents agree with the physical picture of neoclassical bootstrap currents. Change of magnetic configuration due to finite-beta eff\u0027ect has been well described by the 3-D MHD equilibrium analysis. An escape of particles from the core region leading to a hollow density profile has been observed in hydrogen plasmas, which is mitigated through core fueling with a pellet injection or in helium discharges.\"", "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 2010-02-05T10:16:13Z (GMT). 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Confinement Studies in LHD", "subitem_title_language": "en"}]}, "item_type_id": "5", "owner": "3", "path": ["32"], "permalink_uri": "http://hdl.handle.net/10655/2367", "pubdate": {"attribute_name": "公開日", "attribute_value": "2010-02-05"}, "publish_date": "2010-02-05", "publish_status": "0", "recid": "9565", "relation": {}, "relation_version_is_last": true, "title": ["Plasma Confinement Studies in LHD"], "weko_shared_id": -1}
Plasma Confinement Studies in LHD
http://hdl.handle.net/10655/2367
http://hdl.handle.net/10655/2367ef42b2af-3c1d-4af8-905e-242624aee8a4
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 | Plasma Confinement Studies in LHD | |||||
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 | Yokohama | |||||
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 |
"Fujiwara, M.
× "Fujiwara, M.× Yamada, H.× Ejiri, A.× Emoto, M.× Funaba, H.× Goto, M.× Ida, K.× Idei, H.× Inagaki, S.× Kado, S.× Kaneko, O.× Kawahata, K.× Komori, A.× Kubo, S.× Kumazawa, R.× Masuzaki, S.× Minami, T.× Miyazawa, J.× Morisaki, T.× Morita, S.× Murakami, S.× Muto, S.× Muto, T.× Nagayama, Y.× Nakamura, Y.× Nakanishi, H.× Narihara, K.× Nishimura, K.× Noda, N.× Kobuchi, T.× Ohdachi, S.× Ohyabu, N.× Oka, Y.× Osakabe, M.× Ozaki, T.× Peterson, B. J.× Sagara, A.× Sakakibara, S.× Sakamoto, R.× Sasao, H.× Sasao, M.× Sato, K.× Sato, M.× Seki, T.× Shimozuma, T.× Shoji, M.× Sazuki, H.× Takeiri, Y.× Tanaka, K.× Toi, K.× Tokuzawa, T.× Tsumori, K.× Yamada, I.× Yamaguchi, S.× Yokoyama, M.× Watanabe, K. Y.× Watari, T.× Akiyama, R.× Chikaraishi, H.× Haba, K.× Hamaguchi, S.× Iima, M.× Imagawa, S.× Inoue, N.× Iwamoto, K.× Kitagawa, S.× Kubota, Y.× Kodaira, J.× Maekawa, R.× Mito, T.× Nagasaka, T.× Nishimura, A.× Takita, Y.× Takahashi, C.× Takahata, K.× Yamauchi, K.× Tamura, H.× Tsuzuki, T.× Yamada, S.× Yanagi, N.× Yonezu, H.× Hamada, Y.× Matsuoka, K.× Murai, K.× Ohkubo, K.× Ohtake, I.× Okamoto, M.× Sato, S.× Satow, T.× Sudo, S.× Tanahashi, S.× Yamazaki, K.× Motojima, O.× Iiyoshi, A." |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | "The initial experiments of the Large Helical Device (LHD) have extended confinement studies on currentless plasmas to a large scale (R=3.9 m, a = 0.6 m). Heating by NBI of 3 MW has produced plasmas with a fusion triple product of 8 x 10^18 keVm^-3s at a magnetic field of 1.5T. An electron temperature of 1.5 keV and an ion temperature of l.1 keV have been achieved simultaneously at the line-averaged electron density of 1.5 x 10^19 m^-3. The maximum stored energy has reached 0.22 MJ with neither unexpected confinement deterioration nor visible MHD instabilities, which corresponds to <beta> =0.7%. Energy confinement times, reaching 0.17 s at the maximum, have shown a manner similar to the present scaling law derived from the existing medium sized helical devices, but improve on it by 50%. A distinguishing feature of a favorable dependence of energy confinement time on density remains in the present power density (~40kW/m^3) and the electron density (3x 10^19m^-3) regimes unlike L-mode in tokamaks. Temperatures of both electrons and ions as high as 200 eV have been observed at the outermost flux surface, which indicates a qualitative jump in performance from the helical devices to date. Spontaneously generated toroidal currents agree with the physical picture of neoclassical bootstrap currents. Change of magnetic configuration due to finite-beta eff'ect has been well described by the 3-D MHD equilibrium analysis. An escape of particles from the core region leading to a hollow density profile has been observed in hydrogen plasmas, which is mitigated through core fueling with a pellet injection or in helium discharges." | |||||
書誌情報 |
en : Research Report NIFS-Series 発行日 1998-10-01 |
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報告書番号 | ||||||
NIFS-572 | ||||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0915-633X |