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Statistical properties of edge plasma turbulence in the Large Helical Device
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Dewhurst, J. M., Hnat, B., Ohno, N. (Nobutada), Dendy, R. O., Masuzaki, S., Morisaki, T. and Komori, A. (2008) Statistical properties of edge plasma turbulence in the Large Helical Device. Plasma Physics and Controlled Fusion, Vol.50 (No.9). Article no. 095013. doi:10.1088/0741-3335/50/9/095013
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Official URL: http://dx.doi.org/10.1088/0741-3335/50/9/095013
Abstract
Ion saturation current (I-sat) measurements made by three tips of a Langmuir probe array in the Large Helical Device are analysed for two plasma discharges. Absolute moment analysis is used to quantify properties on different temporal scales of the measured signals, which are bursty and intermittent. Strong coherent modes in some datasets are found to distort this analysis and are consequently removed from the time series by applying bandstop filters. Absolute moment analysis of the filtered data reveals two regions of power-law scaling, with the temporal scale tau approximate to 40 mu s separating the two regimes. A comparison is made with similar results from the Mega-Amp Spherical Tokamak. The probability density function is studied and a monotonic relationship between connection length and skewness is found. Conditional averaging is used to characterize the average temporal shape of the largest intermittent bursts.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Library of Congress Subject Headings (LCSH): | Plasma turbulence, Fusion reactors -- Japan, Statistical mechanics | ||||
| Journal or Publication Title: | Plasma Physics and Controlled Fusion | ||||
| Publisher: | Institute of Physics Publishing Ltd. | ||||
| ISSN: | 0741-3335 | ||||
| Official Date: | September 2008 | ||||
| Dates: |
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| Volume: | Vol.50 | ||||
| Number: | No.9 | ||||
| Number of Pages: | 15 | ||||
| Page Range: | Article no. 095013 | ||||
| DOI: | 10.1088/0741-3335/50/9/095013 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Funder: | Engineering and Physical Sciences Research Council (EPSRC), Kakuyūgō Kagaku Kenkyūjo [Japan. National Institute for Fusion Science], Euratom |
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