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X-ray spectra of plasma radiation from laser induced low-power vacuum discharge

I V Romanov, A A Kologrivov, V L Paperny, A A Rupasov, A N Starodub2018年Plasma Physics and Controlled FusionIF 2.2出版社

The x-ray spectra of plasma radiation in the wavelength range 30–300 Å are studied. The radiation is emitted from plasma of a vacuum discharge with storage energy less than 30 J that is initiated on an Al or Fe cathode by beam from neodymium laser with a power density up to 1012 W cm−2. It is shown that both the spectral composition and intensity of radiation of hot micropinch plasma that is formed in the cathodic jet are determined by the set of the discharge and the laser pulse characteristics. By optimizing these characteristics, a mode of the discharge operation is attainable, in which a significant portion of the radiation energy is located in the long-wave band of the quasi-continuum (230–270 Å and 160–200 Å for Al and Fe cathodes, respectively). That makes it possible to treat such a discharge as an intense source of narrow-band soft x-ray radiation.

日本語訳

波長範囲30~200 Åにおけるプラズマ放射のX線スペクトルを研究した。この放射は、蓄積エネルギーが30 J未満の真空放電のプラズマから放出され、ネオジムレーザーによる出力密度が10¹² W cm⁻²までのビームを用いてAlまたはFe陰極上で開始される。高温マイクロピンチプラズマのスペクトル組成と放射強度の両方が、放電およびレーザーパルスの特性の組み合わせによって決定されることが示された。これらの特性を最適化することにより、放射エネルギーのかなりの部分が準連続スペクトルの長波長帯域(Al陰極では230~270 Å、Fe陰極では160~200 Å)に位置する放電モードが達成可能である。これにより、このような放電を狭帯域軟X線の強力な光源として扱うことが可能となる。

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