On the effective diffusion length for microwave breakdown

Jordan, U.; Anderson, D.; Lapierre, L.; Lisak, M.; Olsson, Torsten; Puech, J.; Semenov, V. E.; Sombrin, J.; Tomala, Rafal

doi:10.1109/tps.2006.872189

Cited by 25 publications

(24 citation statements)

References 10 publications

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“…We will see that Equation (3) provides a good description of breakdown in the pressure region above P t with the assumption that D1/P.  is the effective diffusion length in cm, which depends on pressure 25 (1), but providing additional confirmation that the high threshold electric field and extremely high pressure of this branch appears to correspond to a low collision frequency per Torr at breakdown. Two distinctions between Equations (1) and (3) are the power law m and the ratio D/ 2 .…”

Section: Resultsmentioning

confidence: 75%

Collision and diffusion in microwave breakdown of nitrogen gas in and around microgaps

et al. 2014

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The microwave induced breakdown of N 2 gas in microgaps was modeled using the collision frequency between electrons and neutral molecules and the effective electric field concept. Low pressure breakdown at the threshold electric field occurs outside the gap, but at high pressures it is found to occur inside the microgap with a large threshold breakdown electric field corresponding to a very large electron oscillation amplitude. Three distinct pressure regimes are apparent in the microgap breakdown: a low pressure multipactor branch, a mid-pressure Paschen branch, both of which occur in the space outside the microgap, and a high pressure diffusion-drift branch, which occurs inside the microgap. The Paschen and diffusion-drift branches are divided by a sharp transition and each separately fits the collision frequency model. There is evidence that considerable electron loss to the microgap faces accompanies the diffusion-drift branch in microgaps.

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Section: Resultsmentioning

confidence: 75%

Collision and diffusion in microwave breakdown of nitrogen gas in and around microgaps

et al. 2014

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“…[5,6] and references therein. In addition we will generalize the analysis in [1] by including the influence of attachment on the breakdown threshold.…”

Section: Formulation and Solution Of Eigenvalue Problemmentioning

confidence: 99%

“…An often used way of characterizing the breakdown threshold condition is by means of the effective diffusion length, L eff , defined as, cf [1,3,5,6]…”

Section: Effective Diffusion Lengthmentioning

confidence: 99%

Microwave Breakdown Field in a Resonant Spherical Cavity

Tomala

Jordan

Anderson³

et al. 2006

Contrib. Plasma Phys.

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In the present work, the microwave breakdown threshold in a gas-filled spherical resonator, is determined for the case when the cavity is excited in its lowest order mode, which implies that the microwave field strength depends on both radius and azimuthal angle. A semi-analytical approximation of the breakdown threshold is found using a direct variational approach. The variational predictions are compared with the results of full numerical calculations and demonstrate very good agreement

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13] Spaceships are subject to the risk of microwave breakdown occurring on the aperture of slot antennas 3,6,7 and/or inside microwave satellite payloads. [9][10][11][12][13] The risk of breakdown appears during the atmospheric entry of space vehicles in planet exploratory missions or during Earth's atmospheric re-entry, as well as in the Telemetry Tracking and Control (TTC) launching phase. The resulting partially ionized gas leads to strong absorption and/or reflection of the incident microwave signal, what can lead to a dramatic increase of the ohmic losses and to a noticeable temperature rise, with the subsequent permanent damage of the instruments.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, we apply the Rayleigh-Ritz method to solve the eigenvalue problem of the corona equation. 10,12,28 The results obtained are compared with the circular waveguide, which serves as a reference when the eccentricity of the ellipse tends to zero.…”

Section: Introductionmentioning

confidence: 99%