Ion gyroscale fluctuation measurement with microwave imaging reflectometer on KSTAR

W. Lee; J. Leem; G. S. Yun; H. K. Park; S. H. Ko; W. X. Wang; R. V. Budny; N. C. Luhmann; K. W. Kim

doi:10.1063/1.4963152

Ion gyroscale fluctuation measurement with microwave imaging reflectometer on KSTAR

W. Lee, J. Leem, G. S. Yun, H. K. Park, S. H. Ko, W. X. Wang, R. V. Budny, N. C. Luhmann, K. W. Kim

School of Electronics Engineering

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

Ion gyroscale turbulent fluctuations with the poloidal wavenumber k_θ ∼ 3 cm^-1 have been measured in the core region of the neutral beam (NB) injected low confinement (L-mode) plasmas on Korea superconducting tokamak advanced research. The turbulence poloidal wavenumbers are deduced from the frequencies and poloidal rotation velocities in the laboratory frame, measured by the multichannel microwave imaging reflectometer. Linear and nonlinear gyrokinetic simulations also predict the unstable modes with the normalized wavenumber k_θρ_s ∼ 0.4, consistent with the measurement. Comparison of the measured frequencies with the intrinsic mode frequencies from the linear simulations indicates that the measured ones are primarily due to the E × B flow velocity in the NB-injected fast rotating plasmas.

Original language	English
Article number	11E134
Journal	Review of Scientific Instruments
Volume	87
Issue number	11
DOIs	https://doi.org/10.1063/1.4963152
State	Published - 1 Nov 2016

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title = "Ion gyroscale fluctuation measurement with microwave imaging reflectometer on KSTAR",

abstract = "Ion gyroscale turbulent fluctuations with the poloidal wavenumber kθ ∼ 3 cm-1 have been measured in the core region of the neutral beam (NB) injected low confinement (L-mode) plasmas on Korea superconducting tokamak advanced research. The turbulence poloidal wavenumbers are deduced from the frequencies and poloidal rotation velocities in the laboratory frame, measured by the multichannel microwave imaging reflectometer. Linear and nonlinear gyrokinetic simulations also predict the unstable modes with the normalized wavenumber kθρs ∼ 0.4, consistent with the measurement. Comparison of the measured frequencies with the intrinsic mode frequencies from the linear simulations indicates that the measured ones are primarily due to the E × B flow velocity in the NB-injected fast rotating plasmas.",

author = "W. Lee and J. Leem and Yun, {G. S.} and Park, {H. K.} and Ko, {S. H.} and Wang, {W. X.} and Budny, {R. V.} and Luhmann, {N. C.} and Kim, {K. W.}",

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doi = "10.1063/1.4963152",

language = "English",

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T1 - Ion gyroscale fluctuation measurement with microwave imaging reflectometer on KSTAR

AU - Lee, W.

AU - Leem, J.

AU - Yun, G. S.

AU - Park, H. K.

AU - Ko, S. H.

AU - Wang, W. X.

AU - Budny, R. V.

AU - Luhmann, N. C.

AU - Kim, K. W.

PY - 2016/11/1

Y1 - 2016/11/1

N2 - Ion gyroscale turbulent fluctuations with the poloidal wavenumber kθ ∼ 3 cm-1 have been measured in the core region of the neutral beam (NB) injected low confinement (L-mode) plasmas on Korea superconducting tokamak advanced research. The turbulence poloidal wavenumbers are deduced from the frequencies and poloidal rotation velocities in the laboratory frame, measured by the multichannel microwave imaging reflectometer. Linear and nonlinear gyrokinetic simulations also predict the unstable modes with the normalized wavenumber kθρs ∼ 0.4, consistent with the measurement. Comparison of the measured frequencies with the intrinsic mode frequencies from the linear simulations indicates that the measured ones are primarily due to the E × B flow velocity in the NB-injected fast rotating plasmas.

AB - Ion gyroscale turbulent fluctuations with the poloidal wavenumber kθ ∼ 3 cm-1 have been measured in the core region of the neutral beam (NB) injected low confinement (L-mode) plasmas on Korea superconducting tokamak advanced research. The turbulence poloidal wavenumbers are deduced from the frequencies and poloidal rotation velocities in the laboratory frame, measured by the multichannel microwave imaging reflectometer. Linear and nonlinear gyrokinetic simulations also predict the unstable modes with the normalized wavenumber kθρs ∼ 0.4, consistent with the measurement. Comparison of the measured frequencies with the intrinsic mode frequencies from the linear simulations indicates that the measured ones are primarily due to the E × B flow velocity in the NB-injected fast rotating plasmas.

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U2 - 10.1063/1.4963152

DO - 10.1063/1.4963152

M3 - Article

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VL - 87

JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

IS - 11

M1 - 11E134

ER -

Ion gyroscale fluctuation measurement with microwave imaging reflectometer on KSTAR

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