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Electrostatic and magnetic measurements of turbulence and transport in Extrap T2

Anders Möller, Eva Sallander1999年Plasma Physics and Controlled FusionIF 2.2出版社

Langmuir probe and magnetic pick-up coil measurements are used to study edge turbulence in the Extrap T2 reversed field pinch. Magnetic fluctuations resonant outside the toroidal field reversal surface are observed where previously only fluctuations in the spectra of potential and electron density and temperature have been measured. Results are presented which imply that these fluctuations are coupled to and also correlated to the internally resonant tearing mode fluctuations. Evidence of coupling between low-frequency (<100 kHz) and high-frequency fluctuations is also presented. The normalized floating potential fluctuations are seen to increase with the edge electron temperature. This causes an increase of the potential and density fluctuation driven transport with the temperature which is faster than linear. These results, in combination, are consistent with a picture where internally resonant fluctuations couple to edge fluctuations through radial heat conduction from the stochastic core to the edge.

日本語訳

ラングミュアプローブと磁気ピックアップコイルの測定を用いて、Extrap T2逆転磁場ピンチにおけるエッジ乱流を研究した。トロイダル磁場反転面の外側で共鳴する磁気揺動が観測されたが、そこでは従来、ポテンシャルと電子密度のスペクトル、ならびに電子温度の揺動のみが測定されていた。これらの揺動が内部共鳴テアリングモード揺動と結合していることを示唆する結果が提示される。低周波数(<100 kHz)揺動と高周波数揺動との間の結合の証拠も提示される。規格化された浮遊ポテンシャル揺動は、エッジ電子温度とともに増加することが観測される。これにより、ポテンシャルおよび密度揺動駆動の輸送が温度とともに線形よりも速く増加する。これらの結果を総合すると、内部共鳴揺動が確率的コアからエッジへの径方向熱伝導を通じてエッジ揺動と結合するという描像と整合的である。

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