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Micropinches in laser induced moderate power vacuum discharge

Yu V Korobkin, V L Paperny, I V Romanov, A A Rupasov, A S Shikanov2008年Plasma Physics and Controlled FusionIF 2.2出版社

Studies of x-ray emission from a laser induced vacuum discharge of moderate storage energy (<20 J) are examined. It is found that micropinches in the initial stage of the cathode jet expansion into the interelectrode gap are formed. Hot plasma of the micropinches emits a soft x-ray radiation and beams of accelerated electrons moving toward the anode. It is found that these phenomena occur just when both amplitude of the discharge current and energy of the initiating laser pulse lie in the specified ranges of values. The position of the micropinch within the interelectrode gap and also the intensity of the x-ray radiation and beams of the accelerated electrons emitted from the micropinch are variable over a wide range of values through changes in energy of the laser pulse and/or amplitude of the discharge current. The experimental results are compared with the data of the particle-in-cell simulations and a fair agreement is found between them.

日本語訳

レーザー誘起真空放電(蓄積エネルギー20 J未満)からのX線放出の研究について検討した。陰極ジェットが電極間ギャップへと初期段階で膨張する際に、マイクロピンチが形成されることが見出された。マイクロピンチの高温プラズマは、軟X線放射と陽極方向へ移動する電子ビームを放出する。これらの現象は、放電電流の振幅とレーザーパルスのエネルギーが特定の範囲内にある場合にのみ発生することが明らかになった。マイクロピンチの電極間ギャップ内での位置、ならびにX線放射と加速電子ビームの強度は、レーザーパルスのエネルギーおよび/または放電電流の振幅を変化させることにより、広い範囲で変動し得る。実験結果をパーティクル・イン・セルシミュレーションのデータと比較したところ、両者の間に良好な一致が見られた。

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