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Investigation of dual mode (O-X) correlation reflectometry fordetermination of magnetic field strength

M Gilmore, W A Peebles, X V Nguyen2000年Plasma Physics and Controlled FusionIF 2.2出版社

A new method to measure the internal magnetic field in a plasma, based oncross-correlation of ordinary (O) mode and extraordinary (X) modereflectometer signals originating from naturally occurring turbulence, isinvestigated. This method relies on identifying the O- and X-mode frequencypair (fo, fx) where cross-correlation is maximum. Maximumcross-correlation is found to occur at an X-mode frequency slightly lower thanthe right-hand cut-off frequency. It is shown that the magnetic field strengthcan be determined from reflectometer data interpreted via a one-dimensionalmodel, given estimates of the k-spectral width of the electrostatic plasmaturbulence, and the electron density gradient scale length.

日本語訳

プラズマ中の内部磁場を測定する新しい方法について、自然発生する乱流に由来する常波(Oモード)および異常波(Xモード)反射計信号の相互相関に基づく手法を調査した。この方法は、相互相関が最大となるOモードおよびXモードの周波数対(fo, fx)を特定することに依存している。相互相関が最大となるのは、Xモード周波数が右旋カットオフ周波数よりわずかに低い場合であることが見出された。静電プラズマ乱流のkスペクトル幅と電子密度勾配スケール長が与えられれば、一次元モデルを用いて解釈した反射計データから磁場強度を決定できることが示された。

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Reflectometry
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