| Autor: |
Shi, Zhongbing, Fang, Kairui, Li, Jingchun, Zou, Xiaolan, Lu, Zhaoyang, Wen, Jie, Wang, Zhanhui, Ding, Xuantong, Chen, Wei, Yang, Zengchen, Ji, Min Jiang Xiaoquan, Tong, Ruihai, Li, Yonggao, Shi, Peiwang, Zhong, Wulyv, Xu, Min |
| Rok vydání: |
2023 |
| Předmět: |
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| Druh dokumentu: |
Working Paper |
| Popis: |
The dynamics of long-wavelength ($k_\theta<1.4 \mathrm{\ cm^{-1}}$), broadband (20-200 kHz) electron temperature fluctuations ($\tilde T_e/T_e$) of plasmas in gas-puff experiments were observed for the first time in HL-2A tokamak. In a relative low density ($n_e(0) \simeq 0.91 \sim 1.20 \times10^{19}/m^3$) 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 ($n_e(0) \simeq 1.83 \sim 2.02 \times10^{19}/m^3$) scenario, the phenomena were not observed. Furthermore, compelling evidence indicates that $\textbf{E} \times \textbf{B}$ 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. |
| Databáze: |
arXiv |
| Externí odkaz: |
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