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Physics of wire array Z-pinch implosions: experiments at Imperial College

S V Lebedev, D J Ampleford, S N Bland, S C Bott, J P Chittenden, J Goyer, C Jennings, M G Haines, G N Hall, D A Hammer2005年Plasma Physics and Controlled FusionIF 2.2出版社

A review of recent experiments on the MAGPIE generator (1 MA, 250 ns) aimed at studying the implosion dynamics of wire array Z-pinches is presented. The first phase of implosion is dominated by the gradual ablation of stationary wire cores and gradual redistribution of the array mass by the precursor plasma flow. It is found that the rate of wire ablation depends on the magnitude of the global (collective) magnetic field of the array, and increases with the field. The existence of the modulation of the ablation rate along the wires leads to the presence of a 'trailing' mass left behind by the imploding current sheath. The trailing mass provides an alternative path for the current, reducing the force available for compression of the pinch at stagnation. The observed dependence of the ablation rate on inter-wire separation suggests an explanation for the existence of the optimal wire number maximizing the x-ray power. Axially resolved spectroscopy shows the presence of the x-ray 'bright' spots (< 150 µm) emitting intense continuum radiation.

日本語訳

MAGPIE発生装置(1 MA、250 ns)を用いたワイヤアレイZピンチの爆縮ダイナミクスに関する最近の実験のレビューを提示する。爆縮の第一段階は、静止したワイヤコアの漸進的なアブレーションと、前駆プラズマ流によるアレイ質量の漸進的な再分布によって支配される。ワイヤのアブレーション率は、アレイの大域的(集団的)磁場の大きさに依存し、磁場とともに増加することが見出された。ワイヤに沿ったアブレーションの変調の存在は、爆縮する電流シースの背後に残される「尾流」質量の存在をもたらす。尾流質量は電流の代替経路を提供し、スタグネーション時のピンチ圧縮に利用可能な力を減少させる。アブレーション率のワイヤ間隔への依存性は、X線出力を最大化する最適なワイヤ数の存在に対する説明を示唆する。軸方向に分解された分光測定により、強い連続放射を放出するX線「輝点」(< 150 µm)の存在が示される。

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