2026-10-13T17:22:24Z https://www.scidb.cn/oai

10.57760/sciencedb.05154 2022-10-28T11:25:00Z

2022-10-28 Experimental identification of nonlinear coupling between (intermediate, small)-scale microturbulence and an MHD mode in the core of a superconducting tokamak doi:10.57760/sciencedb.05154 en In this paper, we present clear experimental evidence of core region nonlinear coupling between (intermediate, small)-scale microturbulence and an magnetohydrodynamics (MHD) mode during the current ramp-down phase in a set of L-mode plasma discharges in the experimental advanced superconducting tokamak (EAST, Wan et al (2006 Plasma Sci. Technol. 8 253)). Density fluctuations of broadband microturbulence (krho_i~ 2−5.2) and the MHD mode (toroidal mode number m = −1, poloidal mode number n = 1) are measured simultaneously, using a four-channel tangential CO2 laser collective scattering diagnostic in core plasmas. The nonlinear coupling between the broadband microturbulence and the MHD mode is directly demonstrated by showing a statistically significant bicoherence and modulation of turbulent density fluctuation amplitude by the MHD mode. turbulence; MHD mode; nonlinear coupling sun peng jun Yadong Li Yang Ren Xiaodong Zhang Guojiang Wu Liqing Xu Ran Chen Qun Li Hailin Zhao Jizong Zhang Tonghui Shi Yumin Wang Bo Lv Liqun Hu Jiangang Li PUBLIC https://creativecommons.org/licenses/by/4.0/ dataset http://www.doi.org/https://doi.org/10.1088/1741-4326/aa8a91 Science Data Bank