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Abstract <p>The damageability of the vanadium surface and ejection of microdroplets from it into the vacuum chamber of the Plasma Focus Vikhr setup was studied under the influence of pulsed ion and plasma flows (working gas was deuterium or helium) with a radiation power density of ~10<sup>6</sup>–10<sup>8</sup> W/cm<sup>2</sup>. It was shown that, as a result of pulsed heating, a liquid film—a thin layer of vanadium melt—is formed on the surface of the sample. Under the action of plasma flow moving parallel to the vanadium sample surface at a high speed, Kelvin–Helmholtz instability occurs, which leads to the formation of waves on the molten layer surface. Impact of plasma flow and powerful acoustic pulses arising from pulsed irradiation of the sample leads to the disruption of liquid vanadium microdroplets and their transfer to the surface of the copper screen-collector. The possible influence of such processes on the operation of controlled thermonuclear fusion facilities is noted.</p>

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Surface Damage and Particle Ejection during Irradiation of Vanadium with Pulsed Flows of Ions and Plasma in the Plasma Focus Device

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • V. N. Kolokoltsev,
  • S. A. Maslyaev,
  • V. N. Pimenov,
  • A. S. Demin,
  • E. V. Morozov,
  • N. A. Epifanov,
  • I. V. Borovitskaya,
  • E. V. Demina,
  • I. P. Sasinovskaya,
  • A. I. Gaidar

摘要

Abstract

The damageability of the vanadium surface and ejection of microdroplets from it into the vacuum chamber of the Plasma Focus Vikhr setup was studied under the influence of pulsed ion and plasma flows (working gas was deuterium or helium) with a radiation power density of ~106–108 W/cm2. It was shown that, as a result of pulsed heating, a liquid film—a thin layer of vanadium melt—is formed on the surface of the sample. Under the action of plasma flow moving parallel to the vanadium sample surface at a high speed, Kelvin–Helmholtz instability occurs, which leads to the formation of waves on the molten layer surface. Impact of plasma flow and powerful acoustic pulses arising from pulsed irradiation of the sample leads to the disruption of liquid vanadium microdroplets and their transfer to the surface of the copper screen-collector. The possible influence of such processes on the operation of controlled thermonuclear fusion facilities is noted.