Journal Article

FZJ-2015-04764

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Edge-coherent-mode nature of the small edge localized modes in Experimental Advanced Superconducting Tokamak

Wang, H. Q. (Corresponding author) ; Xu, G. S. ; Guo, H. Y. ; Wan, B. N. ; Wang, L. ; Chen, R. ; Ding, S. Y. ; Yan, N. ; Gong, X. Z. ; Liu, S. C. ; Shao, L. M. ; Chen, L. ; Zhang, W. ; Liang, Y.FZJ* ; Hu, G. H. ; Liu, Y. L. ; Li, Y. L. ; Zhao, N.

2014
American Institute of Physics [S.l.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/18124  doi:10.1063/1.4896237

Abstract: High-confinement regime with high-frequency and low-energy-loss small edge localized modes (ELMs) was achieved in Experimental Advanced Superconducting Tokamak by using the lower hybrid current drive and ion cyclotron resonance heating with lithium wall conditioning. The small ELMs are usually accompanied with a quasi-coherent mode at frequency around 30 kHz, as detected by the Langmuir probes near the separatrix. The coherent mode, with weak magnetic perturbations different from the precursor of conventional ELMs, propagates in the electron diamagnetic drift direction in the lab frame with the poloidal wavelength λθ ∼ 14 cm, corresponding to both high poloidal and toroidal mode numbers (m > 60 and n > 12). This coherent mode, carrying high-temperature high-density filament-like plasma, drives considerable transport from the pedestal region into the scrape-off layer towards divertor region. The co-existence of small ELMs and quasi-coherent modes is beneficial for the sustainment of long pulse H-mode regime without significant confinement degradation.

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Contributing Institute(s):

1. Plasmaphysik (IEK-4)

Research Program(s):

1. 174 - Plasma-Wall-Interaction (POF3-174) (POF3-174)

Appears in the scientific report 2015

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Database coverage:
; ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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