NDLI: Impact of DC electric fields on HPM induced surface flashover

Content Provider	IEEE Xplore Digital Library
Author	Thomas, M.A. Foster, J. Krompholz, H. Neuber, A.
Copyright Year	2009
Description	Author affiliation: Center for Pulsed Power and Power Electronics, Texas Tech University, Lubbock, 79409, USA (Thomas, M.A.; Foster, J.; Krompholz, H.; Neuber, A.)
Abstract	The introduction of a high voltage DC electrode into an experimental setup used for observing high power microwave surface flashover has shown to significantly vary the total delay time for this type of breakdown. The experiment utilizes an S-band magnetron operating at 2.85 GHz to produce a 4 MW, 3µs pulse. A plasma switch mounted in a WR-284 waveguide reduces the 10–90% rise time of the pulse to ∼50 ns, and it reflects the pulse towards a dielectric window to induce surface flashover. A wire electrode charged to ±20 kV is inserted into the center of the dielectric window and oriented perpendicularly to the major electric field component of the TE10 microwave mode. The DC field from the electrode influences charge carriers in the flashover region, forcing potential breakdown initiating charged particles away from or towards the surface, dependent on polarity and particle charge sign. Initial tests were conducted in pure N at a pressure of 125 torr. The low probability of negative ions (stable negative N ions do not exist) appearing in the volume simplifies the interpretation of the experimental results by allowing for the existence of primarily electrons and positively charged ions. A significant increase (∼50%) in the average total delay time for the case of a positively charged electrode has been observed. An increase in the average statistical delay was also observed as well as a decrease in the presumed formative delay for both voltage polarities. The apparent electron production rate in N was estimated to be 2 e/µs and 8 e/µs under HPM pulse application in the case of positive and negative DC voltages, respectively. Results of further tests conducted in Argon and Krypton-85 in Argon balance are presented along with a statistical analysis of measured delay times.
Starting Page	1
Ending Page	1
File Size	82071
Page Count	1
File Format	PDF
ISBN	9781424426171
ISSN	07309244
DOI	10.1109/PLASMA.2009.5227632
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-01
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Flashover Electrodes Breakdown voltage Delay effects Switches Dielectrics Testing Electrons Argon Plasma waves
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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