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- Title
High-current electron beam in a hollow-cathode gas discharge at elevated pressures (∼100 Torr).
- Authors
Sorokin, A. R.
- Abstract
A discharge with plasma filling a flat-bottom cavity of depth δ in the cathode, partly closed by a dielectric plate with a hole (determining the aperture of the discharge between the cavity bottom and the anode), has been studied. In a discharge cell of type 1 with δ = 0.5 mm and a hole diameter of 22 mm, a pulsed electron beam was obtained with a duration of t EB = 700 ns and a beam current j EB approximately 10 times greater than that ( j AD) of the equivalent anomalous discharge (at fixed discharge voltage U and gas pressure p He = 3.5 Torr). An electric field with the direction opposite to the field of applied voltage appeared at the cathode that was related to a space charge formed at the cathode plasma boundary, which could not follow a rapid drop of voltage across the discharge gap. In a discharge cell of type 2 with δ = 0.5 mm and a narrow slit ( S = 0.1 × 5 cm2) in the dielectric plate, a pulsed electron beam was obtained with a duration of t EB = 2 ns and a beam current of j EB = 0.7 kA/cm2 ( j EB/ j AD = 1.5) at U = 4.2 kV and p He = 50 Torr.
- Subjects
ELECTRON beams; GLOW discharges; CATHODES; ELECTRIC fields; ELECTRIC potential; PLASMA gases
- Publication
Technical Physics Letters, 2007, Vol 33, Issue 5, p392
- ISSN
1063-7850
- Publication type
Article
- DOI
10.1134/S1063785007050094