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タイトル: | Global saturation physics of ion temperature gradient turbulence in finite normalized pressure tokamaks |
著者: | Masui, Hideaki Ishizawa, Akihiro https://orcid.org/0000-0002-5323-8448 (unconfirmed) Imadera, Kenji Kishimoto, Yasuaki https://orcid.org/0000-0002-3049-9063 (unconfirmed) Nakamura, Yuji https://orcid.org/0000-0002-3196-0296 (unconfirmed) |
著者名の別形: | 石澤, 明宏 今寺, 賢志 岸本, 泰明 中村, 祐司 |
キーワード: | plasma turbulence magnetic confinement fusion nonlinear phenomena in plasmas plasma fusion |
発行日: | Apr-2022 |
出版者: | IOP Publishing International Atomic Energy Agency (IAEA) |
誌名: | Nuclear Fusion |
巻: | 62 |
号: | 7 |
論文番号: | 074001 |
抄録: | Nonlinear saturation mechanism of ion-temperature-gradient turbulence at finite normalized pressure is identified by analysis of the nonlinear entropy transfer in global gyrokinetic simulations of the turbulence. Turbulence at such finite normalized pressure is electromagnetic and often exhibits non-saturation due to a lack of zonal flows by the influence of magnetic fluctuations of the turbulence in local gyrokinetic simulations. The present study identifies a new saturation mechanism caused by global entropy transfer due to turbulent E × B flow convection in real space. The convection of the entropy associated with the turbulence in the radial direction produces global zonal flows at the both sides of the most active region of the turbulence to avoid the effect of the magnetic fluctuations, and then global zonal-flow excitation is not suppressed, leading to a steady state of the turbulence. |
著作権等: | © 2022 The Author(s). Published on behalf of IAEA by IOP Publishing Ltd 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. |
URI: | http://hdl.handle.net/2433/274000 |
DOI(出版社版): | 10.1088/1741-4326/ac667f |
出現コレクション: | 学術雑誌掲載論文等 |
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