Experimental Investigations of Quasi-Coherent Micro-Instabilities in J-TEXT Ohmic Plasmas
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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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Peng Shi, G. Zhuang, Zhifeng Cheng, Li Gao, Yinan Zhou, Yong Liu, J. T. Luo, Jingchun Li. Experimental Investigations of Quasi-Coherent Micro-Instabilities in J-TEXT Ohmic Plasmas[J]. Chin. Phys. Lett., 2024, 41(5): 055201. DOI: 10.1088/0256-307X/41/5/055201
Peng Shi, G. Zhuang, Zhifeng Cheng, Li Gao, Yinan Zhou, Yong Liu, J. T. Luo, Jingchun Li. Experimental Investigations of Quasi-Coherent Micro-Instabilities in J-TEXT Ohmic Plasmas[J]. Chin. Phys. Lett., 2024, 41(5): 055201. DOI: 10.1088/0256-307X/41/5/055201
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Peng Shi, G. Zhuang, Zhifeng Cheng, Li Gao, Yinan Zhou, Yong Liu, J. T. Luo, Jingchun Li. Experimental Investigations of Quasi-Coherent Micro-Instabilities in J-TEXT Ohmic Plasmas[J]. Chin. Phys. Lett., 2024, 41(5): 055201. DOI: 10.1088/0256-307X/41/5/055201
Peng Shi, G. Zhuang, Zhifeng Cheng, Li Gao, Yinan Zhou, Yong Liu, J. T. Luo, Jingchun Li. Experimental Investigations of Quasi-Coherent Micro-Instabilities in J-TEXT Ohmic Plasmas[J]. Chin. Phys. Lett., 2024, 41(5): 055201. DOI: 10.1088/0256-307X/41/5/055201
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