NDLI: Scaling laws for sub-nanosecond breakdown in gases with pressures below one atmosphere

Content Provider	IEEE Xplore Digital Library
Author	Justis, W. Chaparro, J. Krompholz, H. Hatfield, L. Neuber, A.
Copyright Year	2007
Description	Author affiliation: Center for Pulsed Power and Power Electronics, Departments of Electrical & Computer Engineering and Physics, Texas Tech University, Lubbock 79409, USA (Justis, W.; Chaparro, J.; Krompholz, H.; Hatfield, L.; Neuber, A.)
Abstract	With a RADAN 303 A pulser (risetime 150 ps, maximum voltage 150 kV into matched load), fast breakdown in argon and air is investigated. An oil-filled coaxial transmission line is coupled with a lens to a biconical section and a radial millimeter size gap operated at sub-atmospheric pressure. On the other side of the gap, the arrangement is symmetrically continued to represent a matched load. Pulse risetime at the gap is increased to about 180 ps. With capacitive dividers the voltage across the transmission line separating incident and reflected pulses is measured, which allows to determine voltage across and current through the gap. Temporal resolution is defined by the digitizer (20 Gs/s, 6 GHz). Breakdown usually happens during the rising part of the applied voltage pulse. Breakdown curves, i.e. breakdown voltage or time-to-breakdown vs. pressure, have been measured for different applied dV/dt’s (from $2x10^{14}V/s$ to $8x10^{14}$ V/s) and they resemble Paschen curves with a steep increase toward low pressure, and a slow increase toward high pressure. The major findings, such as shifts of the minimum formative time toward increasing pressure with increasing dV/dt, are discussed in terms of similarity laws. Discharges for this case are characterized by runaway electrons over much of the pressure range, with a strong excitation and ionization layer at the cathode surface, and “free-fall” conditions with negligible gaseous ionization for the rest of the gap. Monte-Carlo simulations for the initial stage of the discharge are expected to confirm and quantify the experimental findings.
Starting Page	1648
Ending Page	1651
File Size	383527
Page Count	4
File Format	PDF
ISBN	9781424409136
DOI	10.1109/PPPS.2007.4652506
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-06-17
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Delay Electric breakdown Discharges Voltage measurement Ionization Argon Transmission line measurements
Content Type	Text
Resource Type	Article

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Scaling Laws for Sub-Nanosecond Breakdown in Gases with Pressures Below One Atmosphere

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