Interface Breakdown During High-Power Microwave Transmission

Neuber, A.; Edmiston, G.; Krile, J.; Krompholz, H.; Dickens, J.; Kristiansen, M.

doi:10.1109/tmag.2006.887680

Cited by 55 publications

(20 citation statements)

References 5 publications

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“…This has been verified by calculating the field distribution and S parameters with Ansoft's 3D high frequency structure simulator ͑HFSS͒. 7 Although the measured power signals will change with a variation in pressure and maximum applied power, the general shape of the transmitted power is always similar to the one depicted in Fig. 3.…”

Section: Methodsmentioning

confidence: 74%

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Dielectric surface flashover at atmospheric conditions under high-power microwave excitation

et al. 2007

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Due to recent advances in the peak output power densities and pulse widths of high-power microwave (HPM) devices, the ability to radiate this power into the atmosphere is limited by surface plasma formation at the vacuum-air interface. Very little is known about this window flashover under HPM excitation at “air” side pressures from atmospheric down to approximately 90Torr, and this paper reports one such study at 2.85GHz and MW∕cm2 pulsed power densities. Due to the high (∼600GHz at standard temperature and pressure) elastic collision frequencies of the electrons with the neutral gas molecules and added energy-loss channels through molecule excitation, proven concepts of vacuum flashover, such as multipactoring electrons, have to be abandoned. The observed flashover field is roughly a factor 3 higher in SF6 compared to air, which is consistent with unipolar volume breakdown data. Quantitative comparisons of HPM flashover data with results from a recently developed computer code are given.

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Section: Methodsmentioning

confidence: 74%

“…1, is discussed in detail elsewhere. 7 A flat dielectric sample, 6 mm in thickness, is bolted with nonconducting screws ͑Nylon or Lexan͒ to a custom made exit flange of the WR284 waveguide. The exit flange was designed to keep the electric field amplitude low at the triple point at the "upstream" side of the window.…”

Section: Methodsmentioning

confidence: 99%

Dielectric surface flashover at atmospheric conditions under high-power microwave excitation

et al. 2007

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“…The most effective method is to modify the geometry with the goal of altering the trajectories of electrons so as to eliminate multipactor. 8,9 Changing the surface profile by periodically grooving has been found to obviously increase the transmitted power in S-band high power microwave ͑HPM͒ window breakdown experiment both at 90-120 Torr pressure 10,11 and under vacuum. 12 The effect of the oblique rf electric field on the multipactor susceptibility has been analyzed.…”

Section: Suppressing High-power Microwave Dielectric Multipactor By Tmentioning

confidence: 99%

Suppressing high-power microwave dielectric multipactor by the sawtooth surface

et al. 2009

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This paper theoretically and experimentally researches the effect of a periodic sawtooth surface on vacuum multipactor. Dynamic calculation and particle-in-cell simulation are applied to analyze the electron impact energy and multipactor scenario on the periodic isosceles triangular surface with different slope angles and heights. It has been discovered that, with the slope angle increasing, the impact energy significantly decreases to be lower than the first crossover energy of the secondary yield curve, leading to suppressed multipactor. S-band high power microwave dielectric breakdown experiment, with microsecond pulse length, was conducted. It is confirmed by experiment that the periodic sawtooth surface with sufficiently large slope angle (such as 45°) can effectively increase the breakdown threshold of about 2 compared to the flat surface.

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“…Furthermore, the inner surface of the dielectric can be grooved periodically and coated with TiN, so the breakdown threshold can be improved. [32][33][34][35] In a word, flashover can be avoided for a 20 ns short pulse in the future experiment.…”

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confidence: 99%