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  1. B200 工学部/工学研究科
  2. B200a 雑誌掲載論文
  3. 学術雑誌

Ignition and Sustainment of Arcing on Nanostructured Tungsten Under Plasma Exposure

http://hdl.handle.net/2237/00030893
903f65bd-edfc-443d-a1a8-b5261b489e27
名前 / ファイル ライセンス アクション
IEEETPS_dogyun_final_compressed.pdf IEEETPS_dogyun_final_compressed (1.5 MB)
Item type 学術雑誌論文 / Journal Article(1)
公開日 2019-11-15
タイトル
タイトル Ignition and Sustainment of Arcing on Nanostructured Tungsten Under Plasma Exposure
著者 Hwangbo, Dogyun

× Hwangbo, Dogyun

WEKO 94266

Hwangbo, Dogyun

Search repository
Nishijima, Daisuke

× Nishijima, Daisuke

WEKO 94267

Nishijima, Daisuke

Search repository
Kajita, Shin

× Kajita, Shin

WEKO 94268

Kajita, Shin

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Doerner, Russell P.

× Doerner, Russell P.

WEKO 94269

Doerner, Russell P.

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Barengolts, Sergey A.

× Barengolts, Sergey A.

WEKO 94270

Barengolts, Sergey A.

Search repository
Tsventoukh, Mikhail M.

× Tsventoukh, Mikhail M.

WEKO 94271

Tsventoukh, Mikhail M.

Search repository
Tanaka, Hirohiko

× Tanaka, Hirohiko

WEKO 94272

Tanaka, Hirohiko

Search repository
Ohno, Noriyasu

× Ohno, Noriyasu

WEKO 94273

Ohno, Noriyasu

Search repository
権利
権利情報 “© 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.”
キーワード
主題Scheme Other
主題 tungsten
キーワード
主題Scheme Other
主題 divertor
キーワード
主題Scheme Other
主題 nanostructure
キーワード
主題Scheme Other
主題 unipolar arcing
キーワード
主題Scheme Other
主題 nuclear fusion
抄録
内容記述 Laser-induced arc was initiated on a nanostructured “fuzz” tungsten cathode with simultaneous exposure to a stationary helium (He) plasma. Arc spots moved randomly and eroded almost all the surface area. The diameter of each arc spot was measured to be 5-10 μm. A linear relationship was observed in the arc current-voltage characteristic, which was affected by the presence of resistance through a He plasma column. The specific resistance of He plasmas was estimated from the current-voltage characteristic, which showed a good agreement with theoretical calculations. A greater potential gap should be maintained to keep a higher arc current, indicating a good sign for preventing a high-current arc in fusion devices. The condition of arc ignition was investigated in detail by changing the He plasma parameters and the sheath potential drop. The ignition and sustainment of arcs were very sensitive to both the sheath potential drop and the sheath electric field. Arcs ignited when the sheath potential drop was negatively deeper than -100 V and the sheath electric field was above 2 MV/m. The relatively low electric field threshold would result from the thermofield emission aided by heating of spots from adjacent former spots. This result indicates that the electron density and the electron temperature should be reduced in order to lower the potential drop and the sheath electric field in front of the plasma-facing material surface, which can prevent arcs from igniting in fusion devices.
内容記述タイプ Abstract
出版者
出版者 IEEE
言語
言語 eng
資源タイプ
資源タイプresource http://purl.org/coar/resource_type/c_6501
タイプ journal article
DOI
関連識別子
識別子タイプ DOI
関連識別子 https://doi.org/10.1109/TPS.2019.2910839
ISSN(print)
収録物識別子タイプ ISSN
収録物識別子 0093-3813
書誌情報 IEEE Transactions on Plasma Science

巻 47, 号 8, p. 3617-3625, 発行日 2019-04-24
著者版フラグ
値 author
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