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Parametric investigation of the rotamak discharge in a 10-litre spherical vessel

N Donaldson, R Hahnheuser, I R Jones, G Staines, S Xu1994年Plasma Physics and Controlled FusionIF 2.2出版社

A new series of rotamak experiments conducted in a 10-litre spherical pyrex discharge vessel are described. This series of experiments uses a two-channel RF system (0.5 MHz, 40 ms pulse duration, 116 kW/channel) capable of operating at much higher power levels than have previously been available. The properties of the rotamak discharge as a circuit element are presented together with detailed measurements of the plasma/field configuration. Steady toroidal currents of up to 7 kA have been driven with an RF power input of 180 kW. Electron densities and temperatures of up to 6*1019 m-3 and 11 eV have been obtained. A substantial fraction of the driven current has been tentatively identified as bootstrap current driven by the dynamo action of the radial plasma transport across the poloidal magnetic field.

日本語訳

10リットルの球形パイレックス放電容器で実施された一連の新しいロタマック実験について述べる。この一連の実験では、従来利用可能であったものよりもはるかに高い出力レベルで動作可能な2チャンネルRFシステム(0.5 MHz、40 msパルス幅、116 kW/チャンネル)を使用する。回路要素としてのロタマック放電の特性を、プラズマ・磁場配位の詳細な測定結果とともに提示する。180 kWのRF入力電力により、最大7 kAの定常トロイダル電流が駆動された。電子密度は最大6×10¹⁹ m⁻³、電子温度は最大11 eVが得られた。駆動電流のかなりの割合が、ポロイダル磁場を横切る動径方向のプラズマ輸送のダイナモ作用によって駆動されるブートストラップ電流であると暫定的に同定された。

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