Experimental Investigations of Quasi-Coherent Micro-Instabilities in J-TEXT Ohmic Plasmas

石鹏 ¹庄革 ²程芝峰 ³高丽 ³周乙楠 ³刘永 ⁴罗景庭 ⁴李景春⁴

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作者信息

1. Institute of Plasma Physics,Chinese Academy of Sciences,Hefei 230031,China;International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics,State Key Laboratory of Advanced Electromagnetic Engineering and Technology,School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China
2. Department of Engineering and Applied Physics School of Physical Sciences,University of Science and Technology of China,Hefei 230026,China
3. International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics,State Key Laboratory of Advanced Electromagnetic Engineering and Technology,School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China
4. Shenzhen Key Laboratory of Nuclear and Radiation Safety,Institute for Advanced Study in Nuclear Energy&Safety,College of Physics and Optoelectronic Engineering,Shenzhen University,Shenzhen 510640,China
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Abstract

Quasi-coherent micro-instabilities is one of the key topics of magnetic confinement fusion.This work focuses on the quasi-coherent spectra of ion temperature gradient(ITG)and trapped-electron-mode instabilities using newly developed far-forward collective scattering measurements within ohmic plasmas in the J-TEXT tokamak.The ITG mode is characterized by frequencies ranging from 30 to 100 kHz and wavenumbers(kθρs)less than 0.3.Beyond a critical plasma density threshold,the ITG mode undergoes a bifurcation,which is marked by a reduction in frequency and an enhancement in amplitude.Concurrently,enhancements in ion energy loss and degradation in confinement are observed.This ground-breaking discovery represents the first instance of direct experimental evidence that establishes a clear link between ITG instability and ion thermal transport.

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基金项目

国家自然科学基金(0204131240)

国家自然科学基金(11575067)

Shenzhen Municipal Collaborative Innovation Technology Program-International Science and Technology(Science and Technology)C(GJHZ20220913142609017)

the"Fourteenth Five-Year Plan"Basic Technological Research Project(JSZL2022XXXX001)

出版年

2024

中国物理快报(英文版)

中国科学院物理研究所,中国物理学会

中国物理快报(英文版)

CSTPCDEI

影响因子：0.515

ISSN：0256-307X

参考文献量31

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