Ionization Waves and Virtual Anode Propagation in a Fast Capillary Discharge

Igor Rutkevich, Michael Mond, Yitzhak Kaufman, Peter Choi, Mario Favre

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

The propagation of ionization waves (IW) in a hollow-cathode assisted, shielded, fast capillary discharge intended for a soft x-ray emission is investigated in the range of high values of the electric field to gas pressure ratio. In this range, a beam-like electron distribution function is employed for calculating the ionization source and for deriving the electron momentum equation. A system of quasi-one-dimensional macroscopic equations for the on-axis distributions of the plasma parameters and the electric field is obtained, that takes into account the radial electric field. Steady-state numerical calculations for argon filled capillary, demonstrate a new type of cathode-directed IW propagating in an opposite direction to the ionizing electron beam and transferring the virtual anode potential to the cathode hole. The wave velocity has been found to be an increasing function of the gas pressure. This result is in reasonable agreement with the experimentally observed behavior of the time delay for the electric breakdown.
Original languageEnglish GB
Title of host publicationAmerican Physical Society, 53rd Annual Gaseous Electronics Conference October 24-27, 2000 Houston, Texas Meeting ID: GEC00
StatePublished - 1 Oct 2000

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