Generation of Plasma with Increased Ionization Degree in a Pulsed High-Current Low-Pressure Hollow Cathode Discharge

The paper presents the results of research of the processes of generation of pulsed beam-plasma formations in a high-current non-self-sustained glow discharge with a hollow cathode at low (0.025–0.25 Pa) pressures. In the hollow cathode volume of 0.34 m3, the glow discharge pulsed currents up to 800 A were obtained at injected electron currents up to 150 A, discharge burning voltages up to 400 V, and a pulse duration of 1 ms. The plasma with a density of about 1012 cm-3 was formed with ionization degree up to 16%. It has been shown that the electron free path length λC between the Coulomb interactions in the pressure range 0.025–0.05 Pa is by a factor of about 3.5 less than the electron free path length λe when interacting with neutrals at high (10–15%) degree of plasma ionization. The measured saturation electron current density on the single electric probe was 3.7 (0.025 Pa), 5 (0.05 Pa), and 6.7 A/cm2 (0.25 Pa). Relatively homogeneous beam-plasma formations generated in the glow discharge are promising for the formation of intensive pulsed electron beams of large cross section.

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Correspondence to V. V. Yakovlev.

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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 10, pp. 109–116, October, 2020.

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Yakovlev, V.V., Denisov, V.V., Koval, N.N. et al. Generation of Plasma with Increased Ionization Degree in a Pulsed High-Current Low-Pressure Hollow Cathode Discharge. Russ Phys J (2021). https://doi.org/10.1007/s11182-021-02229-1

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Keywords

  • glow discharge with a hollow cathode
  • current-voltage characteristic
  • plasma ionization degree
  • plasma density
  • electron emission
  • Coulomb’s interactions
  • single Langmuir probe