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聚变科学所青年学术交流委员会第280期学术交流活动通知
编辑: 本网站发布时间: 2022年10月17日

题   目:How Zonal Flow Affects Trapped-Electron-Driven Turbulence in Tokamak Plasmas

报告人:陈昊天 副研究员,101室

时   间:2022年10月18日(周二) 上午 10:00  

地   点:聚变所二楼大会议室,兴隆湖五号会议室(远程)

摘   要: Zonal flows (ZFs) are azimuthally symmetric sheared flows spontaneously excited by small scale fluctuations. They are common in both nature and laboratory, and are crucial for the self-regulation of turbulence and transport.

    Here, we show, for the first time, that the zonal flow excitation in the CTEM turbulence is formally isomorphic to that in the ion temperature gradient turbulence. Trapped electrons contribute implicitly only via linear dynamics. Theoretical analyses further suggest that, for short wavelength CTEMs, the zonal flow excitation is weak and, more importantly, not an effective saturation mechanism. Corresponding controlling parameters are also identified theoretically. These findings not only offer a plausible explanation for previous seemingly contradictory simulation results, but can also facilitate controlling the CTEM instability and transport with experimentally accessible parameters.

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