Distinctive features of photoionized plasma from short x-ray-pulse interaction with gaseous medium

The study of a photoionized plasma created through the interaction of a short linearly polarized x-ray pulse with a gaseous medium is presented in the context of the future design of experiments involving femtosecond free-electron laser pulses. The dispersion properties and instabilities of such x-r...

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Veröffentlicht in:Physics of plasmas 2006-01, Vol.13 (1), p.013101-013101-10
Hauptverfasser: Bychenkov, V. Yu, Romanov, D. V., Rozmus, W., Capjack, C. E., Fedosejevs, R.
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Sprache:eng
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Zusammenfassung:The study of a photoionized plasma created through the interaction of a short linearly polarized x-ray pulse with a gaseous medium is presented in the context of the future design of experiments involving femtosecond free-electron laser pulses. The dispersion properties and instabilities of such x-ray-produced plasma are studied. It is shown that a two-stream type of instability can be obtained with a growth rate comparable to the plasma frequency. This is expected to have a dramatic effect on the evolution of an x-ray laser-produced plasma. A model for describing electromagnetic-field generation and emission resulting from the interaction of a short x-ray laser pulse with a gas jet is proposed. Issues addressed include the effect of the thermal electromotive force at the edge of a plasma driven by the anisotropic electron energy distribution that arises from the photoionization of a gas. Terahertz pulse emission from these photoionized plasma is also predicted.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.2150429