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Experimental investigation of the ion resonance instability in a trapped electron plasma

G Bettega, F Cavaliere, M Cavenago, A Illiberi, R Pozzoli, M Romé2005年Plasma Physics and Controlled FusionIF 2.2出版社

An investigation of the ions induced diocotron instability in an electron plasma confined in a Malmberg–Penning trap is presented. The detection of the instability is based on the spectral analysis of the induced charge signals on the walls of the confining electrodes, which allows tracking of the plasma displacement from the axis. The dependence of the instability on the electron energy is analysed by three different methods: (i) injecting electrons with different energies, (ii) heating the electrons with a single radio frequency burst, (iii) varying the ramp-up time of the confining voltage. An experimental technique to limit the ion resonance instability, based on the application of suitable potentials on a set of electrodes, is presented.

日本語訳

マルムバーグ・ペニングトラップに閉じ込められた電子プラズマにおける、イオン誘起ダイオコトロン不安定性の調査を提示する。この不安定性の検出は、閉じ込め電極壁上の誘導電荷信号のスペクトル解析に基づいており、これによりプラズマの軸からの変位を追跡することが可能となる。電子エネルギーに対する不安定性の依存性は、以下の3つの異なる方法によって解析される:(i) 異なるエネルギーを持つ電子を注入する方法、(ii) 単一の高周波バーストで電子を加熱する方法、(iii) 閉じ込め電圧の立ち上げ時間を変化させる方法。さらに、一連の電極に適切な電位を印加することに基づく、イオン共鳴不安定性を抑制する実験的手法を提示する。

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Electron plasmaTrapped electron
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