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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/10655/00012922
72caf061-781c-4cf9-adb6-f60f1bb71d8b
名前 / ファイル ライセンス アクション
Nucl.Fusion57_pp056003.pdf Nucl.Fusion57_pp056003 (1.9 MB)
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Item type 学術雑誌論文 / Journal Article(1)
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

NAKAMURA, Yukio

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TAMURA, Naoki

× TAMURA, Naoki

TAMURA, Naoki

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YOSHINUMA, Mikiro

× YOSHINUMA, Mikiro

YOSHINUMA, Mikiro

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SUZUKI, Chihiro

× SUZUKI, Chihiro

SUZUKI, Chihiro

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YOSHIMURA, Yasuo

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YOSHIMURA, Yasuo

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KOBAYASHI, Masahiro

× KOBAYASHI, Masahiro

KOBAYASHI, Masahiro

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YOKOYAMA, Masayuki

× YOKOYAMA, Masayuki

YOKOYAMA, Masayuki

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NUNAMI, Masanori

× NUNAMI, Masanori

NUNAMI, Masanori

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Nakata, Motoki

× Nakata, Motoki

Nakata, Motoki

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NAGAOKA, Kenichi

× NAGAOKA, Kenichi

NAGAOKA, Kenichi
NAGAOKA, Ken-ichi

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TANAKA, Kenji

× TANAKA, Kenji

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
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
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