| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Long radial coherence of electron temperature fluctuations in non-local transport in HL-2A plasmas |
| Zhongbing Shi(石中兵)1,†, Kairui Fang(方凯锐)1, Jingchun Li(李景春)2,3, Xiaolan Zou(邹晓岚)4, Zhaoyang Lu(卢兆旸)2, Jie Wen(闻杰)1, Zhanhui Wang(王占辉)1, Xuantong Ding(丁玄同)1, Wei Chen(陈伟)1, Zengchen Yang(杨曾辰)1, Min Jiang(蒋敏)1, Xiaoquan Ji(季小全)1, Ruihai Tong(佟瑞海)1, Yonggao Li(李永高)1, Peiwan Shi(施陪万)1, Wulyv Zhong(钟武律)1, and Min Xu(许敏)1 |
1 Southwestern Institute of Physics, Chengdu 610041, China;
2 Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen 518055, China;
3 Shenzhen Key Laboratory of Nuclear and Radiation Safety, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China;
4 CEA, IRFM, Saint-Paul-lez-Durance 13108, France |
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Abstract The dynamics of long-wavelength ($k_\theta<1.4$ cm$^{-1}$), broadband (20 kHz-200 kHz) electron temperature fluctuations ($\tilde T_{\rm e}/T_{\rm e}$) of plasmas in gas-puff experiments are observed for the first time in HL-2A tokamak. In a relatively low density ($n_{\rm e}(0) \simeq 0.91 \times10^{19}$$\rm m^{-3}$-$1.20 \times10^{19}$$\rm m^{-3}$) scenario, after gas-puffing the core temperature increases and the edge temperature drops. On the contrary, temperature fluctuation drops at the core and increases at the edge. Analyses show the non-local emergence is accompanied with a long radial coherent length of turbulent fluctuations. While in a higher density ($n_{\rm e}(0) \simeq 1.83 \times10^{19}$ m$^{-3}$-$2.02 \times10^{19}$ m$^{-3}$) scenario, the phenomena are not observed. Furthermore, compelling evidence indicates that $\bm{E} \times \bm{B}$ shear serves as a substantial contributor to this extensive radial interaction. This finding offers a direct explanatory link to the intriguing core-heating phenomenon witnessed within the realm of non-local transport.
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Received: 10 October 2023
Revised: 08 November 2023
Accepted manuscript online: 29 November 2023
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PACS:
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52.25.Xz
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(Magnetized plasmas)
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52.35.Ra
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(Plasma turbulence)
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52.55.Fa
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(Tokamaks, spherical tokamaks)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2017YFE0301203), the Innovation Program of Southwestern Institute of Physics (Grant No. 202301XWCX001), the Sichuan Science and Technology Program (Grant Nos. 2023ZYD0014 and 2021YFSY0044), the National Natural Science Foundation of China (Grant No. 12175055), and the Shenzhen Municipal Collaborative Innovation Technology ProgramInternational Science and Technology Cooperation Project (Grant No. GJHZ20220913142609017) |
Corresponding Authors:
Zhongbing Shi
E-mail: shizb@swip.ac.cn
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Cite this article:
Zhongbing Shi(石中兵), Kairui Fang(方凯锐), Jingchun Li(李景春), Xiaolan Zou(邹晓岚), Zhaoyang Lu(卢兆旸), Jie Wen(闻杰), Zhanhui Wang(王占辉), Xuantong Ding(丁玄同), Wei Chen(陈伟), Zengchen Yang(杨曾辰), Min Jiang(蒋敏), Xiaoquan Ji(季小全), Ruihai Tong(佟瑞海), Yonggao Li(李永高), Peiwan Shi(施陪万), Wulyv Zhong(钟武律), and Min Xu(许敏) Long radial coherence of electron temperature fluctuations in non-local transport in HL-2A plasmas 2024 Chin. Phys. B 33 025202
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