首页|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
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
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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(perpendicular to) =10, 18 and 26 cm(-1) (i.e., k(perpendicular to)rho(i) similar to 2 i, 3.6 and 5.2, respectively Here, rho(i) is the ion gyroradius and k(perpendicular to) 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 (f(Doppler) = k(t)v(t) 2 pi), 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 S-tot 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.
microturbulencetearing modemodulation effect
Ren, Y.、Zhang, X. D.、Wu, G. J.、Lyu, B.、Shi, T. H.、Xu, L. Q.、Wang, F. D.、Li, Q.、Zhang, J. Z.、Hu, L. Q.、Li, J. G.、Sun, P. J.、Li, Y. D.
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Princeton Plasma Phys Lab, Princeton, NJ 08543 USA
Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Anhui, Peoples R China
Guangdong Univ Technol, Guangzhou 510006, Guangdong, Peoples R China
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Iop Publishing Ltd
