Observation of an edge coherent mode and poloidal flow in the electron cyclotron wave induced high βp plasma in QUEST

Santanu Banerjee, H. Zushi, N. Nishino, K. Mishra, Y. Mahira, S. Tashima, A. Ejiri, T. Yamaguchi, T. Onchi, Y. Nagashima, K. Hanada, K. Nakamura, H. Idei, M. Hasegawa, A. Fujisawa, A. Kuzmin, K. Matsuoka

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Abstract

Fluctuations are measured in the edge and scrape-off layer (SOL) of QUEST using fast visible imaging diagnostic. Electron cyclotron wave injection in the Ohmic plasma features excitation of low frequency coherent fluctuations near the separatrix and enhanced cross-field transport. Plasma shifts from initial high field side limiter bound (inboard limited, IL) towards inboard poloidal null (IPN) configuration with steepening of the density profile at the edge. This may have facilitated the increased edge and SOL fluctuation activities. Observation of the coherent mode, associated plasma flow, and particle out-flux, for the first time in the IPN plasma configuration in a spherical tokamak may provide further impetus to the edge and SOL turbulence studies in tokamaks.

Original languageEnglish
Article number082507
JournalPhysics of Plasmas
Volume23
Issue number8
DOIs
Publication statusPublished - Aug 1 2016

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Banerjee, S., Zushi, H., Nishino, N., Mishra, K., Mahira, Y., Tashima, S., ... Matsuoka, K. (2016). Observation of an edge coherent mode and poloidal flow in the electron cyclotron wave induced high βp plasma in QUEST. Physics of Plasmas, 23(8), [082507]. https://doi.org/10.1063/1.4960117