Generation of Millisecond Low-Energy Large-Radius Electron Beam by a Forevacuum Plasma-Cathode Source

We describe our research on the generation and formation of low-energy (up to 11 keV) large-radius (up to 3.5 cm) electron beams with pulse duration up to 10 ms, in the forevacuum pressure range (4-25 Pa). The electron beam was formed by extraction from a cathodic arc plasma of millisecond pulse dur...

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Bibliographic Details
Published in:IEEE transactions on plasma science 2019-08, Vol.47 (8), p.3579-3585
Main Authors: Kazakov, Andrey V., Medovnik, Alexander V., Oks, Efim M.
Format: Article
Language:English
Subjects:
Acceleration
Anodes
Cathodic arc
Constraining
Discharges (electric)
Efficiency
Electric arcs
electron beam
Electron beams
Electron emission
forevacuum pressure range
Gas pressure
Plasma
plasma-cathode electron source
Plasmas
Pulse duration
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Summary:We describe our research on the generation and formation of low-energy (up to 11 keV) large-radius (up to 3.5 cm) electron beams with pulse duration up to 10 ms, in the forevacuum pressure range (4-25 Pa). The electron beam was formed by extraction from a cathodic arc plasma of millisecond pulse duration using a dc accelerating voltage. To increase the efficiency of electron emission from the plasma, the anode of the plasma source was divided into hollow and plane parts, and the current through the hollow part was limited. When using a redistributing electrode and limiting the current through the hollow part of the anode, the working gas and the gas pressure affect the arc discharge parameters. On the other hand, limiting the current through the hollow part of the anode yields increased efficiency of electron emission from the plasma and provided control of the electron extraction efficiency as well as maximum tolerable gas pressure at the selected beam current. We have generated the electron beam with current up to 23-25 A at pulse duration up to 10 ms in the forevacuum pressure range 4-25 Pa. The electron beam energy per pulse reaches 1800-2000 J.
ISSN:0093-3813
1939-9375
DOI:10.1109/TPS.2019.2909802