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Theory of ECE fluctuations in tokamak plasmas

A D Piliya, A Yu Popov2002年Plasma Physics and Controlled FusionIF 2.2出版社

A microscopic theory of electron cyclotron frequency (ECE) intensity fluctuations caused by a weak low-frequency plasma turbulence is presented. The emission is treated as acollective process and the ECE signal fluctuations are expressed interms of the correlation tensor of random source-currents of bareelectrons modified by the turbulence. A contribution of the backgroundradiation modulation due to turbulence induced fluctuations of the wavedamping rate is also taken into account. The plasma electron excursionsresulting from drift in the turbulent electric field in the presence ofthe temperature gradient are found to be the principal mechanism of theECE fluctuations. Opportunities for ECE fluctuation measurements usingthe ordinary and extraordinary wave modes radiation at various cyclotronharmonics are analysed.

日本語訳

弱い低周波プラズマ乱流によって引き起こされる電子サイクロトロン周波数(ECE)強度変動の微視的理論を提示する。この放射は集団過程として扱われ、ECE信号変動は、乱流によって修正された裸電子のランダム源電流の相関テンソルを用いて表現される。波動減衰率の乱流誘起変動による背景放射の変調の寄与も考慮される。温度勾配の存在下での乱流電場によるドリフトに起因するプラズマ電子の変位が、ECE変動の主要なメカニズムであることが見出された。様々なサイクロトロン高調波における常波および異常波モードの放射を用いたECE変動測定の可能性が分析される。

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Electron cyclotron emission
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