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Study of lower-hybrid wave propagation by CO2-scattering and r.f. probe diagnostics

B Fischer, M Kramer1992年Plasma Physics and Controlled FusionIF 2.2出版社

Coherent CO2-scattering as well as phase-sensitive probe diagnostics are applied to investigate small-amplitude lower-hybrid (LH) waves launched by a slow-wave antenna to a linear plasma column. Special attention is focussed on the detailed description of the LH wave field in the plasma taking into account the wavenumber spectrum of the antenna. With the knowledge of the LH density perturbations, the r.f. detector current is computed under the actual scattering conditions. To fit the theoretical results to the experimental results, an effective collisional frequency nu eff for electron momentum transfer is introduced. The observed LH wave damping is considerably higher than expected from collisional and electron Landau damping, but it is correlated with the level of low-frequency fluctuations. In particular, the scattering and the probe signals are strongly affected by the damping as well as by the low-frequency turbulence itself.

日本語訳

コヒーレントCO2散乱および位相敏感プローブ診断を、線形プラズマ柱内でスロー波アンテナによって励起された小振幅の低混成(LH)波の調査に適用した。アンテナの波数スペクトルを考慮したプラズマ内LH波場の詳細な記述に特に注目した。LH密度摂動の知識に基づき、実際の散乱条件下で高周波検出器電流を計算した。理論結果を実験結果に適合させるため、電子運動量輸送に対する実効衝突周波数ν_effを導入した。観測されたLH波の減衰は、衝突減衰および電子ランダウ減衰から予想される値よりも有意に高く、その減衰は低周波揺動のレベルと相関している。特に、散乱信号およびプローブ信号は、低周波乱流自体と同様に、この減衰によって強く影響を受ける。

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