Observation of large arrays of plasma filaments in air breakdown by 1.5-MW 110-GHz gyrotron pulses
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- Observation of large arrays of plasma filaments in air breakdown by 1.5-MW 110-GHz gyrotron pulses
- Hidaka, Yoshiteru; Choi, EunMi; Mastovsky, I.; Shapiro, M. A.; Sirigiri, J. R.; Temkin, R. J.
- Issue Date
- AMER PHYSICAL SOC
- PHYSICAL REVIEW LETTERS, v.100, no.3, pp.1 - 4
- We report the observation of two-dimensional plasma filamentary arrays with more than 100 elements generated during breakdown of air at atmospheric pressure by a focused Gaussian beam from a 1.5-MW, 110-GHz gyrotron operating in 3-mu s pulses. Each element is a plasma filament elongated in the electric field direction and regularly spaced about one-quarter wavelength apart in the plane perpendicular to the electric field. The development of the array is explained as a result of diffraction of the beam around the filaments, leading to the sequential generation of high intensity spots, at which new filaments are created, about a quarter wavelength upstream from each existing filament. Electromagnetic wave simulations corroborate this explanation and show very good correlation to the observed pattern of filaments.
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