Distinctive features of the high-current glow discharge with the hollow cathode at low gas pressures

A pulsed hollow cathode glow discharge with current up to 200 A, with the pulse width amounting to a few milliseconds, is studied in a wide range of the gas pressure p from 0.01 to 10 Pa. The high current discharge is established due to the application of a high-voltage pulse with amplitude Uo up to...

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Bibliographic Details
Published in:Journal of applied physics 2018-12, Vol.124 (21)
Main Authors: Metel, A., Melnik, Yu
Format: Article
Language:English
Subjects:
Amplitudes
Applied physics
Cathode glow
Electric potential
Gas pressure
Glow discharges
Helium
High current
High voltages
Hollow cathodes
Orifices
Oscillations
Plasma
Pulse amplitude
Pulse duration
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Summary:A pulsed hollow cathode glow discharge with current up to 200 A, with the pulse width amounting to a few milliseconds, is studied in a wide range of the gas pressure p from 0.01 to 10 Pa. The high current discharge is established due to the application of a high-voltage pulse with amplitude Uo up to 5 kV between the anode and the hollow cathode of a continuous discharge with a current of Io = 0.5 A. The establishing time τ ranges from 10 to 300 μs, diminishes with the pulse amplitude growth, increases in the gas pressure, and decreases in the output orifice area of the hollow cathode. At Uo > 2.5 kV, an abnormal mode of the discharge establishing process is observed with intensive oscillations of the discharge current and voltage in the frequency range from 1 to 10 MHz. In the abnormal mode, the high current establishing time τ can be reduced by hundred times down to τ ∼ 1 μs. At a low gas pressure p 
ISSN:0021-8979
1089-7550
DOI:10.1063/1.5055280