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Choi, EunMi
THz Vacuum Electronics and Electrodynamics
Research Interests
  • High power millimeter-wave/THz wave, vacuum electronics, plasma breakdown, electron beams, electromagnetics, microwave/RF engineering

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Plasma structures observed in gas breakdown using a 1.5 MW, 110 GHz pulsed gyrotron

Cited 32 times inthomson ciCited 21 times inthomson ci
Title
Plasma structures observed in gas breakdown using a 1.5 MW, 110 GHz pulsed gyrotron
Author
Hidaka, YoshiteruChoi, EunMiMastovsky, I.Shapiro, M. A.Sirigiri, J. R.Temkin, R. J.Edmiston, G. F.Neuber, A. A.Oda, Y.
Issue Date
2009-05
Publisher
AMER INST PHYSICS
Citation
PHYSICS OF PLASMAS, v.16, no.5, pp.1 - 7
Abstract
Regular two-dimensional plasma filamentary arrays have been observed in gas breakdown experiments using a pulsed 1.5 MW, 110 GHz gyrotron. The gyrotron Gaussian output beam is focused to an intensity of up to 4 MW/ cm2. The plasma filaments develop in an array with a spacing of about one quarter wavelength, elongated in the electric field direction. The array was imaged using photodiodes, a slow camera, which captures the entire breakdown event, and a fast camera with a 6 ns window. These diagnostics demonstrate the sequential development of the array propagating back toward the source. Gases studied included air, nitrogen, SF6, and helium at various pressures. A discrete plasma array structure is observed at high pressure, while a diffuse plasma is observed at lower pressure. The propagation speed of the ionization front for air and nitrogen at atmospheric pressure for 3 MW/ cm2 was found to be of the order of 10 km/s.
URI
https://scholarworks.unist.ac.kr/handle/201301/10874
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=66449116318
DOI
10.1063/1.3083218
ISSN
1070-664X
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