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Comparison of L- and H-mode plasma edge fluctuations in MAST

B D Dudson, R O Dendy, A Kirk, H Meyer, G F Counsell2005年Plasma Physics and Controlled FusionIF 2.2出版社

Edge turbulence measurements from a reciprocating Langmuir probe in MAST are presented. A comparison of the range/standard deviation (R/S), growth of range, first moment and differencing and rescaling methods for calculating the Hurst exponent is made. The differencing and rescaling method is found to be the most useful for identifying scaling over long time-periods. A comparison is made between L-mode, dithering H-mode and H-mode plasma edge turbulence and evidence for self-similarity is found. Tests are performed and it is demonstrated that the results are due to properties of the data, and are not artefacts of the methods. A comparison of Hurst exponent methods with the autocorrelation function and power spectrum is used to demonstrate the presence of long-time correlation in L-mode data, and the absence of long-time correlation in the case of dithering H-mode.

日本語訳

MASTにおける往復ラングミュアプローブを用いたエッジ乱流測定結果を提示する。ハースト指数を計算するためのレンジ/標準偏差(R/S)、レンジの増加、ファーストモーメント、および差分・再スケーリング法の比較を行う。差分・再スケーリング法が、長期間にわたるスケーリングを特定するのに最も有用であることが見出された。Lモード、ディザリングHモード、およびHモードプラズマ間の比較を行い、エッジ乱流における自己相似性の証拠が見出された。検証を実施し、その結果がデータの特性に起因するものであり、手法のアーティファクトではないことを実証した。ハースト指数法と自己相関関数およびパワースペクトルの比較を用いて、Lモードデータにおける長時間相関の存在と、ディザリングHモードの場合における長時間相関の不在を実証した。

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mast高精度(タイトル一致)

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