2026-10-11T20:02:29Z https://www.scidb.cn/oai

10.57760/sciencedb.05140 2022-10-28T11:25:07Z

2022-10-28 Experimental study of the effect of 2/1 classical tearing mode on (intermediate, small)-scale microturbulence in the core of an EAST L mode plasma doi:10.57760/sciencedb.05140 en In this paper, we report an experimental study of the effect of a m/n=−2/−1 (m, n being poloidal and toroidal mode number, separately) classical tearing mode on (intermediate, small)-scale microturbulence (see the definition in section 1) in the core of an EAST L mode plasma discharge. The microturbulence at different scales k⊥=10, 18 and 26 cm−1 (i.e., k^r ~ 2 i , 3.6 and 5.2, respectively. Here, ri is the ion gyroradius and k⊥ is the perpendicular wavenumber) were measured simultaneously by the EAST multi-channel tangential CO2 laser collective scattering diagnostics. Experimental results confirm that the decrease of microturbulent Doppler shift ( fDoppler = kt vt 2p), inversely correlated to the increase of microturbulent mean frequency (defined in equation (1)), is due to the 2/1 tearing mode. Temporal evolution of frequencyintegrated spectral power Stot of microturbulence, found to be correlated with the width of 2/1 magnetic island, suggests the modulation effect on microturbulence by the tearing mode beyond Doppler shift effect. Modulation effects on microturbulence by the tearing mode are further demonstrated by the correlation between microturbulent envelope and magnetic fluctuations. Tearing mode; turbulence; EAST sun peng jun Yadong Li Yang Ren Xiaodong Zhang Guojiang Wu lv Bo Tonghui Shi Liqing Xu Fudi Wang Qun Li Jizong Zhang Liqun Hu Jiangang Li PUBLIC https://creativecommons.org/licenses/by/4.0/ dataset http://www.doi.org/https://doi.org/10.1088/1361-6587/aa9f96 Science Data Bank