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Strong suppression of impurity accumulation in steady-state hydrogen discharges with high power NBI heating on LHD
http://hdl.handle.net/10655/00012922
http://hdl.handle.net/10655/0001292272caf061-781c-4cf9-adb6-f60f1bb71d8b
名前 / ファイル | ライセンス | アクション |
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Nucl.Fusion57_pp056003 (1.9 MB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2022-01-24 | |||||
タイトル | ||||||
タイトル | Strong suppression of impurity accumulation in steady-state hydrogen discharges with high power NBI heating on LHD | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | impurity transport | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | steady-state discharge | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | toroidal rotation | |||||
キーワード | ||||||
主題Scheme | Other | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
著者 |
NAKAMURA, Yukio
× NAKAMURA, Yukio× TAMURA, Naoki× YOSHINUMA, Mikiro× SUZUKI, Chihiro× YOSHIMURA, Yasuo× KOBAYASHI, Masahiro× YOKOYAMA, Masayuki× NUNAMI, Masanori× Nakata, Motoki× NAGAOKA, Kenichi× TANAKA, Kenji |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Strong suppression of impurity accumulation is observed in long pulse hydrogen discharges with high power NBI (neutral beam injection) heating (Pnbi > 10 MW) on the large helical device (LHD), even in the impurity accumulation window where the intrinsic impurities such as Fe and C are always accumulated into the plasma core. Density scan experiments in these discharges demonstrate to vanish the window and a new operational regime without impurity accumulation is found in steady state hydrogen discharges. Impurity pinch decreases with increasing ion temperature gradient and carbon Mach number. The peaking of the measured carbon profiles shows strong anti-correlations with the Mach number and its radial gradient. An external torque has a big impact on impurity transport and strong co-current rotation leads to an extremely hollow carbon profile, so-called 'impurity hole' observed in high ion temperature modes. Impurity pinch in the plasmas with net zero torque input (balanced NBI injection) is also strongly reduced by increasing ion temperature gradient, which can drive turbulent modes. The combination effect of turbulence and toroidal rotation plays an important role in the impurity transport. | |||||
書誌情報 |
Nuclear Fsuion 巻 57, 号 5, p. 056003, 発行日 2017-03-17 |
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出版者 | ||||||
出版者 | IOP Publishing | |||||
出版者 | ||||||
出版者 | International Atomic Energy Agency | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 00295515 | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA00759871 | |||||
DOI | ||||||
関連タイプ | isVersionOf | |||||
識別子タイプ | DOI | |||||
関連識別子 | 10.1088/1741-4326/aa6187 | |||||
権利 | ||||||
権利情報 | This is the Accepted Manuscript version of an article accepted for publication in Nuclear Fusion. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/1741-4326/aa6187. | |||||
情報源 | ||||||
関連名称 | Y. Nakamura et al 2017 Nucl. Fusion 57 056003 | |||||
関連サイト | ||||||
識別子タイプ | DOI | |||||
関連識別子 | https://doi.org/10.1088/1741-4326/aa6187 | |||||
関連名称 | Publisher version | |||||
他の資源との関係 | ||||||
関連名称 | There are some differences between this manuscript to the publisher version. | |||||
著者版フラグ | ||||||
出版タイプ | AM | |||||
出版タイプResource | http://purl.org/coar/version/c_ab4af688f83e57aa | |||||
NAIS | ||||||
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