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Intense and Short Pulse Electric Field (DC and Microwave) Air Breakdown Parameters
Memorandum rept. 1 Oct 85-29 Aug 1986
NAVAL RESEARCH LAB WASHINGTON DC PLASMA PHYSICS DIV
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Experimental data for the drift velocity and Townsend ionization coefficient in N2 and O2 are utilized to obtain the ionization rates in N2, O2 and air. These rates are given over a wide range of Ep and differ from those of Felsenthal and Proud at high Ep because of the draft velocity dependence on E p. Felsenthal and Proud assume a linear dependence on Ep while experimentally, especially at high Ep, this dependence varies as square root of Ep. The developed rates agree well with recent experimental short pulse air breakdown data and are recommended for use in high power microwave short pulse air breakdown and propagation calculations.
APPROVED FOR PUBLIC RELEASE