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Investigation of geodesic acoustic mode oscillations in the T-10 tokamak

A V Melnikov, V A Vershkov, L G Eliseev, S A Grashin, A V Gudozhnik, L I Krupnik, S E Lysenko, V A Mavrin, S V Perfilov, D A Shelukhin2006年Plasma Physics and Controlled FusionIF 2.2出版社

Geodesic acoustic modes (GAMs) were investigated on the T-10 tokamak using heavy ion beam probe, correlation reflectometry and multipin Langmuir probe diagnostics. Regimes with Ohmic heating and with on- and off-axis ECRH were studied. It was shown that GAMs are mainly the potential oscillations. Typically, the power spectrum of the oscillations has the form of a solitary quasi-monochromatic peak with the contrast range 3–5. They are the manifestation of the torsional plasma oscillations with poloidal wavenumber m = 0, called zonal flows. The frequency of GAMs changes in the region of observation and decreases towards the plasma edge. After ECRH switch-on, the frequency increases, correlating with growth in the electron temperature Te. The frequency of the GAMs depends on the local Te as , which is consistent with a theoretical scaling for GAM, where cs is the sound speed within a factor of unity. The GAMs on T-10 are found to have density limit, some magnetic components and an intermittent character. They tend to be more excited near low-q magnetic surfaces.

日本語訳

Geodestic音響モード(GAM)をT-10トカマクにおいて、重イオンビームプローブ、相関反射計測、およびマルチピンラングミュアプローブを用いて調査した。オーミック加熱と、オン軸およびオフ軸ECRHの各レジームについて研究を行った。GAMは主に電位振動であることが示された。典型的には、振動のパワースペクトルは、コントラスト比3〜5の孤立した準単色ピークの形状を有する。これらは、帯状流と呼ばれる、ポロイダル波数m = 0のトロイダルプラズマ振動の顕在化である。GAMの周波数は観測領域内で変化し、プラズマ端に向かって減少する。ECRHスイッチオン後、周波数は増加し、電子温度Teの上昇と相関する。GAMの周波数は局所的なTeに依存し、これは音速csを用いたGAMの理論的スケーリングと因子1の範囲内で一致する。T-10におけるGAMは、密度制限と磁気成分を有し、間欠的な特性を示すことが見出された。これらは低q磁気面の近傍でより強く励起される傾向がある。

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Acoustic modeGeodesic acoustic mode
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