THE DYNAMICS OF XUV PLASMA EMISSION IN A LOW-INDUCTANCE VACUUM SPARK AT THE INITIAL STAGE OF DISCHARGE DEVELOPMENT

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Abstract

The emission dynamics of a vacuum spark with a peak current of ∼50 kA in the wavelength range of λ = = 5–40 nm is analyzed. The radiation was detected by means of the microchannel-plate detectors with a frame temporal resolution of 20 ns. The technique of simultaneous acquisition of the spatial distribution and spectrograms of plasma emission allowed resolving characteristic stages of discharge development. At the initial stage (200–300 ns), strong emission of multiply charged iron ions FeV–FeVIII is detected. This emission disappears later (300–400 ns) and reappears again after 400 ns. The possible role of runaway electrons in the described phenomenon is discussed. The found regime of the discharge can be used upon development of the radiation sources in the extreme UV range.

About the authors

P. S. Antsiferov

Institute for Spectroscopy, Russian Academy of Sciences

Email: ants@isan.troitsk.ru
Troitsk, Moscow, Russia

L. V. Stepanov

Institute for Spectroscopy, Russian Academy of Sciences; National Research University Higher School of Economics

Troitsk, Moscow, Russia; Moscow, Russia

N. D. Matyukhin

Institute for Spectroscopy, Russian Academy of Sciences; Moscow Institute of Physics and Technology (National Research University)

Email: stepanovlavrentij@gmail.com
Troitsk, Moscow, Russia; Dolgoprudny, Russia

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