New Edge Coherent Mode Providing Continuous Transport in Long Pulse H-mode Plasmas

H.Q. Wang, G.S. Xu, B.N. Wan, S.Y. Ding, H.Y. Guo, L.M. Shao, S.C. Liu, X.Q. Xu, E. Wang, Ning Yan, Volker Naulin, Anders Henry Nielsen, Jens Juul Rasmussen, J. Candy, R. Bravenec, Y.W. Sun, T.H. Shi, Y.F. Liang, R. Chen, W. ZhangL. Wang, L. Chen, N. Zhao, Y.L. Li, Y.L. Liu, G.H. Hu, X.Z. Gong

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Abstract

An electrostatic coherent mode near the electron diamagnetic frequency (20–90 kHz) is observed in the steep-gradient pedestal region of long pulse H-mode plasmas in the Experimental Advanced Super-conducting Tokamak, using a newly developed dual gas-puff-imaging system and diamond-coated reciprocating probes. The mode propagates in the electron diamagnetic direction in the plasma frame with poloidal wavelength of ∼8 cm. The mode drives a significant outflow of particles and heat as measured directly with the probes, thus greatly facilitating long pulse H-mode sustainment. This mode shows the nature of dissipative trapped electron mode, as evidenced by gyrokinetic turbulence simulations.
Original languageEnglish
Article number185004
JournalPhysical Review Letters
Volume112
Issue number18
Number of pages5
ISSN0031-9007
DOIs
Publication statusPublished - 2014

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© 2014 American Physical Society

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