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Local measurement of plasma waves modulating the electron cyclotron emissions

Title
Local measurement of plasma waves modulating the electron cyclotron emissions
Authors
YUN, GUNSU
Date Issued
16-Dec-2020
Publisher
Los Alamos National Laboratory
Abstract
Plasma waves, if sufficiently strong, can modulate the intensity of electron cyclotron emission (ECE) in magnetically confined plasmas. We demonstrate a local measurement of plasma waves, for the first time, using the superheterodyne mixers in the existing ECE imaging system on the KSTAR and a high-speed digitizer which captures the intermediate frequency signal for its entirety. Two types of wave modulations, i.e., amplitude modulation and frequency modulation, were observed depending on discharge conditions. An important example of amplitude modulation is the whistler-frequency waves generated during the burst of edge-localized modes [M.H. Kim et al, Nuclear Fusion 60, 126021 (2020)]. An additional benefit of using the ECE imaging system is the capability of multichannel measurements, which enabled determination of perpendicular wave number of the whistler-frequency waves. Work supported by the National Research Foundation of Korea under BK21+ program and Grant No. 2019M1A7A1A03 088456
URI
http://oasis.postech.ac.kr/handle/2014.oak/105012
Article Type
Conference
Citation
High Temperature Plasma Diagnostics Conference, 2020-12-16
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윤건수YUN, GUNSU
Div. of Advanced Nuclear Enginrg
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