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タイトル: | Characteristics of constrained turbulent transport in flux-driven toroidal plasmas |
著者: | Kishimoto, Y. Imadera, K. Ishizawa, A. Wang, W. Li, J. Q. |
著者名の別形: | 岸本, 泰明 今寺, 賢志 石澤, 明宏 |
キーワード: | magnetically confined fusion plasmas tubulent transport non-diffusive transport global flux-driven simulation avalanche dynamics global bursts |
発行日: | 20-Feb-2023 |
出版者: | The Royal Society |
誌名: | Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences |
巻: | 381 |
号: | 2242 |
論文番号: | 20210231 |
抄録: | We study the dynamics of turbulence transport subject to a constraint on the profile formation and relaxation, dominated by the ion temperature gradient modes, within the framework of adiabatic electron response using a flux-driven global gyro-kinetic toroidal code, GKNET. We observe exponentially constrained profiles, with two different scale lengths, that are spatially constant in each region in higher input power regimes. The profiles are smoothly connected in the knee region located at 1/2−2/3 of the minor radius, outside which the gradient is steepened and shows a weak confinement improvement. Based on the probability density function analysis of heat flux eddies, the power law demonstrates a dependence on the eddy size S, as P∼S[−α], which distinguishes events into diffusive and non-diffusive parts including the validation of quasi-linear hypotheses. Radially localized avalanches and global bursts, which exhibit different spatial scales, play central roles in giving rise to constrained profiles on an equal footing. It is also found that the E×B shear layers are initiated by the global bursts, which evolve downward on a slow time scale across the knee region and play a role in adjusting the profile by increasing the gradient. |
著作権等: | © 2023 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License, which permits unrestricted use, provided the original author and source are credited. |
URI: | http://hdl.handle.net/2433/283118 |
DOI(出版社版): | 10.1098/rsta.2021.0231 |
PubMed ID: | 36587826 |
出現コレクション: | 学術雑誌掲載論文等 |
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