NDLI: Breakdown in helium in high-voltage open discharge with subnanosecond current front rise

Content Provider	Springer Nature Link
Author	Schweigert, I. V. Alexandrov, A. L. Bokhan, P. A. Zakrevskiy, Dm. E.
Copyright Year	2016
Abstract	Investigations of high-voltage open discharge in helium have shown a possibility of generation of current pulses with subnanosecond front rise, due to ultra-fast breakdown development. The open discharge is ignited between two planar cathodes with mesh anode in the middle between them. For gas pressure 6 Torr and 20 kV applied voltage, the rate of current rise reaches 500 A/(cm$^{2}$ ns) for current density 200 A/cm$^{2}$ and more. The time of breakdown development was measured for different helium pressures and a kinetic model of breakdown in open discharge is presented, based on elementary reactions for electrons, ions and fast atoms. The model also includes various cathode emission processes due to cathode bombardment by ions, fast atoms, electrons and photons of resonant radiation with Doppler shift of frequency. It is shown, that the dominating emission processes depend on the evolution of the discharge voltage during the breakdown. In the simulations, two cases of voltage behavior were considered: (i) the voltage is kept constant during the breakdown; (ii) the voltage is reduced with the growth of current. For the first case, the exponentially growing current is maintained due to photoemission by the resonant photons with Doppler-shifted frequency. For the second case, the dominating factor of current growth is the secondary electron emission. In both cases, the subnanosecond rise of discharge current was obtained. Also the effect of gas pressure on breakdown development was considered. It was found that for 20 Torr gas pressure the time of current rise decreases to 0.1 ns, which is in agreement with experimental data.
Starting Page	666
Ending Page	677
Page Count	12
File Format	PDF
ISSN	1063780X
Journal	Plasma Physics Reports
Volume Number	42
Issue Number	7
e-ISSN	15626938
Language	English
Publisher	Pleiades Publishing
Publisher Date	2016-07-22
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Atomic, Molecular, Optical and Plasma Physics
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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