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Reply to criticism of the scintillation technique to measure plasma density fluctuations by Weisen (1986)

L E Sharp1987年Plasma Physics and Controlled FusionIF 2.2出版社

H. Weisen in a publication 'Imaging methods for the observation of plasma density fluctuations' (ibid., vol.28, p.1147, 1986) refers to a paper by Sharp (Plasma Physics vol.25, p.781 1983) and assesses that the technique of phase scintillations (phase fluctuations impressed on a diffracted electromagnetic wave) described in that paper has serious limitations in its ability to measure those plasma density fluctuations for which it was designed. This was said to be in part due to its inability to measure absolute phase variations, while, in order to obtain sufficient sensitivity, the necessary distance from the plasma at which observations must be made violated the requirement that they made in the near field. These conclusions are based on the totally incorrect assertion that Sharp proposed that the measurements be performed without the use of a reference beam or use of an interferometer. Sharp points out that his paper clearly describes measurements made with an interferometer operating at 2 mm wavelength to measure the phase fluctuations and that the measurement technique did indeed have a reference 'beam', did in fact measure absolute phase, and consequently has the sensitivity to measure phase fluctuations in the near field.

日本語訳

H. Weisenは、論文「プラズマ密度揺らぎの観測方法」(同上、第28巻、1147頁、1986年)において、Sharpの論文(Plasma Physics、第25巻、781頁)に言及し、その論文で述べられた位相シンチレーション(回折した電磁波に重畳される位相変動)の手法には、その手法が本来測定対象とするプラズマ密度揺らぎを測定する能力に関して重大な限界があると評価している。これは、絶対位相変動を測定できないことに一部起因しており、十分な感度を得るために必要なプラズマからの測定距離が、近接場で測定を行うという要件に反するためである。これらの結論は、Sharpが参照ビームや干渉計を使用せずに測定を行うことを提案したという完全に誤った主張に基づいている。Sharpは、自身の論文が2mm波長で動作する干渉計を用いた測定を明確に記述しており、その測定手法は実際に参照「ビーム」を有し、実際に絶対位相を測定しており、したがって近接場における位相変動を測定する感度を有していると指摘している。

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