| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Experimental Investigations of Quasi-Coherent Micro-Instabilities in J-TEXT Ohmic Plasmas |
| Peng Shi1,2, G. Zhuang3, Zhifeng Cheng2, Li Gao2, Yinan Zhou2, Yong Liu4, J. T. Luo4, and Jingchun Li4* |
1Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
2International 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
3Department of Engineering and Applied Physics School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China
4Shenzhen 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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| Cite this article: |
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Peng Shi, G. Zhuang, Zhifeng Cheng et al 2024 Chin. Phys. Lett. 41 055201 |
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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 ($k_{\theta}\rho_{\rm s})$ 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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Received: 01 November 2023
Published: 15 May 2024
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