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박현거

Park, Hyeon Keo
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Study of ion-gyroscale fluctuations in low-density L-mode plasmas heated by NBI on KSTAR

Author(s)
Lee, W.Ko, S. H.Leem, J.Yun, G. S.Park, Hyeon KeoWang, W. X.Budny, R. V.Kim, K. W.Luhmann, N. C., Jr.
Issued Date
2018-04
DOI
10.1088/1741-4326/aaac4b
URI
https://scholarworks.unist.ac.kr/handle/201301/23821
Fulltext
http://iopscience.iop.org/article/10.1088/1741-4326/aaac4b/meta
Citation
NUCLEAR FUSION, v.58, no.4, pp.046009
Abstract
Broadband density fluctuations with peak frequency ranging from 150 to 400 kHz were measured using a multichannel microwave imaging reflectometer in core region of the low-density L-mode plasmas heated by neutral beam injection on KSTAR. These fluctuations have been studied by comparing the dominant mode scales estimated from the measurement with those predicted from linear gyrokinetic simulation. The measured poloidal wavenumbers are qualitatively comparable to those of the 'fastest growing modes' from simulations, whereas they are larger than those of the 'transport-dominant modes' by about a factor of three. The agreement on wavenumbers between the measurement and linear simulation (for the fastest growing modes) is probably due to sufficiently weak E x B flow shear compared to the maximum linear growth rate. Meanwhile, the transport-dominant modes seem to be related to the fluctuations in lower frequencies (similar to 80-150 kHz) observed in some of the measurement.
Publisher
IOP PUBLISHING LTD
ISSN
0029-5515
Keyword (Author)
ion-gyroscale fluctuationspoloidal wavenumber of dominant modemicrowave imaging reflectometer
Keyword
TURBULENCE SIMULATIONSTOKAMAKSHEARCONFINEMENTTRANSPORT

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