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Spectrum broadening and fluctuations of lower hybrid waves observed in the CASTOR tokamak

F Zácek, R Klíma, K Jakubka, P Plísek, S Nanobashvili, P Pavlo, J Preinhaelter, J Stöckel, L Kryska1999年Plasma Physics and Controlled FusionIF 2.2出版社

Strong fluctuations of lower hybrid waves (LHW) amplitudes inside the plasma have been observed in experiments with different types of launchers. The fluctuation frequency is much higher than the frequency of plasma density fluctuations. This effect is explained by the presence of plasma fluctuations along the whole ray path. LHW spectrum broadening has been found by means of a double radiofrequency probe. This experimental result supports the assumption of spectral gap filling between the electron velocity distribution function and the spectrum launched into the plasma.

日本語訳

強い揺らぎ(strong fluctuations)の低混成波(lower hybrid waves)が、プラズマ内部で観測された。プラズマ密度揺らぎは、全伝播経路に沿って存在することが確認された。低混成波スペクトルのブロードニング(spectrum broadening)は、二重高周波プローブ(double radiofrequency probe)を用いて測定された。この実験結果は、スペクトルギャップ(spectral gap)がプラズマ中の揺らぎによって埋められるという仮説を支持するものである。

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