Global saturation physics of ion temperature gradient turbulence in finite normalized pressure tokamaks

Masui Hideaki; 増井 英陽; Ishizawa Akihiro; 石澤 明宏; Imadera Kenji; 今寺 賢志; Kishimoto Yasuaki; 岸本 泰明; Nakamura Yuji; 中村 祐司

タイトル	en Global saturation physics of ion temperature gradient turbulence in finite normalized pressure tokamaks
作成者	en Masui, Hideaki ja 増井, 英陽 en Ishizawa, Akihiro ja 石澤, 明宏 ORCID 0000-0002-5323-8448 e-Rad_Researcher 30390636 ROR https://ror.org/02kpeqv85 en Imadera, Kenji ja 今寺, 賢志 e-Rad_Researcher 90607839 ROR https://ror.org/02kpeqv85 en Kishimoto, Yasuaki ja 岸本, 泰明 ORCID 0000-0002-3049-9063 e-Rad_Researcher 10344441 en Nakamura, Yuji ja 中村, 祐司 ORCID 0000-0002-3196-0296 e-Rad_Researcher 20198245
アクセス権	open access
権利情報	en © 2022 The Author(s). Published on behalf of IAEA by IOP Publishing Ltd https://creativecommons.org/licenses/by/4.0/ en 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.
主題	Other en plasma turbulence Other en magnetic confinement fusion Other en nonlinear phenomena in plasmas Other en plasma fusion
内容注記	Abstract en 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.
出版者	en IOP Publishing en International Atomic Energy Agency (IAEA)
日付	Issued2022-04
言語	eng
資源タイプ	journal article
出版タイプ	VoR
資源識別子	HDL http://hdl.handle.net/2433/274000
関連	isIdenticalTo DOI https://doi.org/10.1088/1741-4326/ac667f
助成情報	助成機関名 ja 日本学術振興会研究課題番号 JP17K06991 https://kaken.nii.ac.jp/ja/grant/KAKENHI-PROJECT-17K06991/ JGN 研究課題名 ja 高エネルギー粒子輸送へのバルクプラズマ乱流の影響
収録誌情報	PISSN 0029-5515 EISSN 1741-4326 en Nuclear Fusion 巻62 号7
ファイル	fulltext 1741-4326_ac667f.pdf (application/pdf)
コンテンツ更新日時	2026-02-18