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Plasmas 18 022505) due to high levels of turbulent heat transport observed in the experiments. The electron-turbulent-heat transport appears non-stiff and is of the electron temperature gradient (ETG)/ion temperature gradient (ITG) type (Weir et al 2021 Nucl. Fusion 61 056001). As a result, the electron temperature Te can be varied freely from 1 keV–10 keV within the range of PECRH = 1–7 MW, with electron density ne values from 0.1–1.5 × 1020 m−3. By contrast, in combination with the broad electron-to-ion energy-exchange heating profile in ECRH plasmas, ion-turbulent-heat transport leads to clamping of the central ion temperature at Ti ∼ 1.5 keV ± 0.2 keV. In a dedicated ECRH power scan at a constant density of 〈ne〉 = 7 × 1019 m−3, an apparent \u0027negative ion temperature profile stiffness\u0027 was found in the central plasma for (r/a \u003c 0.5), in which the normalized gradient ∇Ti/Ti decreases with increasing ion heat flux. 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Ion temperature clamping in Wendelstein 7-X electron cyclotron heated plasmas
http://hdl.handle.net/10655/00013565
http://hdl.handle.net/10655/0001356516d25b26-1c8e-479c-9319-7a6e943aafcd
名前 / ファイル | ライセンス | アクション |
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Nucl.Fusion_61_116072 (6.8 MB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2023-03-03 | |||||
タイトル | ||||||
タイトル | Ion temperature clamping in Wendelstein 7-X electron cyclotron heated plasmas | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | turbulent transport | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | electron heated plasmas | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | ion heat transport | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | neoclassically optimised stellarator | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | power balance | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | profile stiffness | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | ion temperature clampingElectron cyclotron heating | |||||
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 |
BEURSKENS, Marc
× BEURSKENS, Marc× BOZHENKOV, Sergey× FORD, O.× XANTHOPUOLOS, Pavlos× ZOCCO, Alessandro× TURKIN, Yuri× ALONSO, Juan Arturo× BEIDLER, Craig× CALVO, I.× CARRALERO, Daniel× ESTRADA, Teresa× FUCHERT, Golo× GRULKE, O.× HIRSCH, M.× IDA, Katsumi× JAKUBOWSKI, Marcin× KILLER, Carsten× KRYCHOWIAK, Maciej× KWAK, Sehyun× LAZERSON, Samuel× LANGENBERG, Andreas× LUNSFORD, Robert× PABLANT, Novimir× PASCH, E.× PAVONE, Andrea× REIMOLD, F.× ROMBA, Thilo× STECHOW, A. von× SMITH, H. M.× WINDISCH, T.× YOSHINUMA, Mikirou× ZHANG, Daihong× WOLF, Robert× the W7-X Team |
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著者ID | ||||||
内容記述タイプ | Other | |||||
内容記述 | 0000-0002-3354-0279 | |||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | The neoclassical transport optimization of the Wendelstein 7-X stellarator has not resulted in the predicted high energy confinement of gas fueled electron-cyclotron-resonance-heated (ECRH) plasmas as modelled in (Turkin et al 2011 Phys. Plasmas 18 022505) due to high levels of turbulent heat transport observed in the experiments. The electron-turbulent-heat transport appears non-stiff and is of the electron temperature gradient (ETG)/ion temperature gradient (ITG) type (Weir et al 2021 Nucl. Fusion 61 056001). As a result, the electron temperature Te can be varied freely from 1 keV–10 keV within the range of PECRH = 1–7 MW, with electron density ne values from 0.1–1.5 × 1020 m−3. By contrast, in combination with the broad electron-to-ion energy-exchange heating profile in ECRH plasmas, ion-turbulent-heat transport leads to clamping of the central ion temperature at Ti ∼ 1.5 keV ± 0.2 keV. In a dedicated ECRH power scan at a constant density of 〈ne〉 = 7 × 1019 m−3, an apparent 'negative ion temperature profile stiffness' was found in the central plasma for (r/a < 0.5), in which the normalized gradient ∇Ti/Ti decreases with increasing ion heat flux. The experiment was conducted in helium, which has a higher radiative density limit compared to hydrogen, allowing a broader power scan. This 'negative stiffness' is due to a strong exacerbation of turbulent transport with an increasing ratio of Te/Ti in this electron-heated plasma. This finding is consistent with electrostatic microinstabilities, such as ITG-driven turbulence. Theoretical calculations made by both linear and nonlinear gyro-kinetic simulations performed by the GENE code in the W7-X three-dimensional geometry show a strong enhancement of turbulence with an increasing ratio of Te/Ti. The exacerbation of turbulence with increasing Te/Ti is also found in tokamaks and inherently enhances ion heat transport in electron-heated plasmas. This finding strongly affects the prospects of future high-performance gas-fueled ECRH scenarios in W7-X and imposes a requirement for turbulence-suppression techniques. | |||||
書誌情報 |
Nuclear Fusion 巻 61, 号 11, p. 116072, 発行日 2021-10-25 |
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出版者 | ||||||
出版者 | IOP Publishing | |||||
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 | 10.1088/1741-4326/ac1653 | |||||
権利 | ||||||
権利情報 | © EURATOM 2021 | |||||
権利 | ||||||
権利情報 | Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. | |||||
権利 | ||||||
権利情報 | 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 | M.N.A. Beurskens et al 2021 Nucl. Fusion 61 116072 | |||||
関連サイト | ||||||
識別子タイプ | DOI | |||||
関連識別子 | http://doi.org/10.1088/1741-4326/ac1653 | |||||
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 |