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Lower hybrid geometrical resonance in linear LISA machine

C da C Rapozo, J C X da Silva, A S de Assis, R Y Honda, H R T Silva, P H Sakanaka1988年Plasma Physics and Controlled FusionIF 2.2出版社

Plasma heating by radio frequency (RF) in the electron cyclotron and lower hybrid frequency ranges has been studied using Langmuir probe, magnetic probe, Faraday cup and optical spectrography in the linear mirror machine LISA. It is found that global modes (ECW) rather than WKB ones have been excited. The plasma heating was via the electron cyclotron resonance and via a linear mode conversion of the extraordinary mode into an upper-hybrid mode and this mode decays into a Bernstein wave (at r=+or-3.0 cm). An RF source of 2.45 GHz and 1.0 kW was used where r is the plasma inner radius. When an additional RF source of 30 MHz and 0.35 kW was introduced it heated the plasma via the lower hybrid resonance at r=5.0 cm and resulted in a 30%, or more, increase in overall electron temperature and plasma density.

日本語訳

プラズマ加熱は、線形ミラー装置LISAにおいて、ラングミュアプローブ、磁気プローブ、ファラデーカップ、光学分光器を用いて、電子サイクロトロン周波数帯および低混成周波数帯の高周波(RF)により研究された。大域的モード(ECW)がWKBモードではなく励起されることが見出された。プラズマ加熱は、電子サイクロトロン共鳴を介して、また異常波の上部混成モードへの線形モード変換を介して行われ、このモードはr=±3.0 cmにおいてバーンスタイン波に減衰する。2.45 GHz、1.0 kWのRF源が使用され、ここでrはプラズマの内半径である。追加の30 MHz、0.35 kWのRF源が導入されると、r=5.0 cmにおける低混成共鳴を介してプラズマを加熱し、その結果、全体の電子温度とプラズマ密度が30%以上増加した。

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