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Confinement improvement during detached phase with RMP application in deuterium plasmas of LHD
http://hdl.handle.net/10655/00013100
http://hdl.handle.net/10655/00013100d06bd537-5cc9-4615-9346-56c125261f4c
名前 / ファイル | ライセンス | アクション |
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Kobayashi_2022_Nucl._Fusion_62_056006 (5.0 MB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2022-04-21 | |||||
タイトル | ||||||
タイトル | Confinement improvement during detached phase with RMP application in deuterium plasmas of LHD | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | divertor detachment | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | core plasma confinement | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | helical devices | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | resonant magnetic perturbation | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | hydrogen isotope effects | |||||
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 |
KOBAYASHI, Masahiro
× KOBAYASHI, Masahiro× SEKI, Ryosuke× HAYASHI, Yuki× OISHI, Tetsutarou× TANAKA, Kenji× TAKEMURA, Yuki× IDA, Katsumi× KINOSHITA, Toshiki× MUKAI, Kiyofumi× MORITA, Shigeru× MASUZAKI, Suguru |
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著者ID | ||||||
内容記述タイプ | Other | |||||
内容記述 | 0000-0002-0990-7093 | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | In order to explore the compatibility of good core plasma performance with divertor heat load mitigation, the interaction between cold edge plasma and core plasma transport, including the edge transport barrier (ETB), has been analysed in the divertor detachment discharges of deuterium plasmas in LHD with resonant magnetic perturbation (RMP) field application. The RMP application introduces a widened edge stochastic layer and sharp boundary in the magnetic field structure between the confinement region and the edge stochastic layer. The widened edge stochastic layer enhances impurity radiation and provides stable detachment operation as compared with the case without RMP. It is found that ETB is formed at the confinement boundary at the onset of detachment transition. However, as the detachment deepens, the resistive pressure gradient-driven MHD mode is excited, which degrades the ETB. At the same time, however, the core transport decreases to keep global plasma stored energy (Wp) unchanged, showing clear core-edge coupling. After a gradual increase of density fluctuation during the MHD activity, a spontaneous increase of Wp and the recovery of ETB are observed while the detachment is maintained. Then, the coherent MHD mode ceases and ELM-like bursts appear. In the improved mode, impurity decontamination occurs, and the divertor heat load increases slightly. Key controlling physical processes in the interplay between core and cold edge plasma are discussed. A comparison between deuterium and hydrogen plasmas shows that hydrogen plasmas exhibit similar features to the deuterium ones in terms of density and magnetic fluctuations, impurity decontamination towards higher confinement, etc. But most of the features are modest in the hydrogen plasmas and thus no clear confinement mode transition with clear ETB formation is defined. Better global confinement is obtained in the deuterium plasmas than the hydrogen ones at a higher radiation level. | |||||
書誌情報 |
Nuclear Fusion 巻 62, 号 5, p. 056006, 発行日 2022-02-17 |
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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 | 0029-5515 | |||||
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 | isIdenticalTo | |||||
識別子タイプ | DOI | |||||
関連識別子 | https://doi.org/10.1088/1741-4326/ac42f3 | |||||
権利 | ||||||
権利情報 | Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work mustmaintain attribution to the author(s) and the title of the work, journal citation and DOI. | |||||
情報源 | ||||||
関連名称 | Citation M. Kobayashi et al 2022 Nucl. Fusion 62 056006 | |||||
関連サイト | ||||||
識別子タイプ | DOI | |||||
関連識別子 | https://doi.org/10.1088/1741-4326/ac42f3 | |||||
関連名称 | Publisher version | |||||
著者版フラグ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
NAIS | ||||||
12938 |