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

doi:10.1063/1.4960117

Observation of an edge coherent mode and poloidal flow in the electron cyclotron wave induced high β_p 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 language	English
Article number	082507
Journal	Physics of Plasmas
Volume	23
Issue number	8
DOIs	https://doi.org/10.1063/1.4960117
Publication status	Published - Aug 1 2016

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1063/1.4960117

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Banerjee, S., Zushi, H., Nishino, N., Mishra, K., Mahira, Y., Tashima, S., Ejiri, A., Yamaguchi, T., Onchi, T., Nagashima, Y., Hanada, K., Nakamura, K., Idei, H., Hasegawa, M., Fujisawa, A., Kuzmin, A., & Matsuoka, K. (2016). Observation of an edge coherent mode and poloidal flow in the electron cyclotron wave induced high β_p plasma in QUEST. Physics of Plasmas, 23(8), [082507]. https://doi.org/10.1063/1.4960117

Banerjee, S, Zushi, H, Nishino, N, Mishra, K, Mahira, Y, Tashima, S, Ejiri, A, Yamaguchi, T, Onchi, T , Nagashima, Y , Hanada, K, Nakamura, K, Idei, H , Hasegawa, M , Fujisawa, A, Kuzmin, A & Matsuoka, K 2016, 'Observation of an edge coherent mode and poloidal flow in the electron cyclotron wave induced high β_p plasma in QUEST', Physics of Plasmas, vol. 23, no. 8, 082507. https://doi.org/10.1063/1.4960117

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

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.",

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

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T1 - Observation of an edge coherent mode and poloidal flow in the electron cyclotron wave induced high βp plasma in QUEST

AU - Banerjee, Santanu

AU - Zushi, H.

AU - Nishino, N.

AU - Mishra, K.

AU - Mahira, Y.

AU - Tashima, S.

AU - Ejiri, A.

AU - Yamaguchi, T.

AU - Onchi, T.

AU - Nagashima, Y.

AU - Hanada, K.

AU - Nakamura, K.

AU - Idei, H.

AU - Hasegawa, M.

AU - Fujisawa, A.

AU - Kuzmin, A.

AU - Matsuoka, K.

PY - 2016/8/1

Y1 - 2016/8/1

N2 - 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.

AB - 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.

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

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