Ionization coefficient approach to modeling breakdown in nonuniform geometries.

Warne, Larry K.; Jorgenson, Roy E.; Nicolaysen, S.

doi:10.2172/918222

Cited by 32 publications

(40 citation statements)

References 18 publications

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“…Therefore, eff is a function of the local effective field and the function eff (E eff ) is deduced from an analytical fits to experimental data obtained in air by Warne et al 22 A plot of eff (E eff ) is shown in Figure 1. The other transport coefficients of Eq.…”

Section: A Physical Modelmentioning

confidence: 99%

Three dimensional simulations of pattern formation during high-pressure, freely localized microwave breakdown in air

2014

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Section: A Physical Modelmentioning

confidence: 99%

Three dimensional simulations of pattern formation during high-pressure, freely localized microwave breakdown in air

2014

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“…Here we apply ionization coefficients to determine threshold breakdown voltage levels [21]. Figure 87 illustrates an electron avalanche and charge growth in an electric field.…”

Section: Threshold Levelsmentioning

confidence: 99%

“…In order to calculate the expected breakdown voltage between the pin electrode and the other two objects in the problem (the coupon and the cable) we follow the method outlined in [21]. The geometry is gridded as shown in Figure 90, using elements that have edge lengths of approximately 1 mm.…”

Section: Calculationmentioning

confidence: 99%

Protection characteristics of a Faraday cage compromised by lightning burnthrough.

Warne¹,

Bystrom²,

Jorgenson³

et al. 2012

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A lightning flash consists of multiple, high-amplitude but short duration return strokes. Between the return strokes is a lower amplitude, continuing current which flows for longer duration. If the walls of a Faraday cage are made of thin enough metal, the continuing current can melt a hole through the metal in a process called burnthrough. A subsequent return stroke can couple energy through this newly-formed hole. This LDRD is a study of the protection provided by a Faraday cage when it has been compromised by burnthrough. We initially repeated some previous experiments and expanded on them in terms of scope and diagnostics to form a knowledge baseline of the coupling phenomena. We then used a combination of experiment, analysis and numerical modeling to study four coupling mechanisms: indirect electric field coupling, indirect magnetic field coupling, conduction through plasma and breakdown through the hole. We discovered voltages higher than those encountered in the previous set of experiments (on the order of several hundreds of volts).3

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“…In the fluid model, the ionization and attachment frequencies are usually combined as the effective ionization frequency ν eff , which can be expressed in terms of the electron drift velocity v d = μ e E (m/s) as [52], [53] …”

Section: ) Plasma Diffusionmentioning

confidence: 99%

Modeling of Plasma Formation During High-Power Microwave Breakdown in Air Using the Discontinuous Galerkin Time-Domain Method

Yan

Greenwood

Jin

2016

IEEE J. Multiscale Multiphys. Comput. Tech.

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Rapid plasma formation and evolution during highpower microwave (HPM) air breakdown in an HPM device produce a macroscopic plasma shield to the microwave transmission, which can severely limit the performance of the device. In this paper, the electromagnetic (EM)-plasma interaction and the HPM breakdown in air are modeled by a nonlinearly coupled full-wave Maxwell and plasma fluid system under conditions of high pressure and high collision frequency. The resulting multiphysics and multiscale system is solved by a nodal discontinuous Galerkin timedomain (DGTD) method, which is uniformly high order in both space and time. To demonstrate the capability of the DGTD method in the modeling of the HPM breakdown problems, the air breakdown and plasma formation in a metallic aperture are simulated, from which the underlining physical process can be interpreted and better understood.Index Terms-Air breakdown, discontinuous Galerkin time domain (DGTD), high-power microwave (HPM), nonlinear modeling, plasma fluid model, plasma formation, plasma shielding.

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Ionization coefficient approach to modeling breakdown in nonuniform geometries.

Cited by 32 publications

References 18 publications

Three dimensional simulations of pattern formation during high-pressure, freely localized microwave breakdown in air

Three dimensional simulations of pattern formation during high-pressure, freely localized microwave breakdown in air

Protection characteristics of a Faraday cage compromised by lightning burnthrough.

Modeling of Plasma Formation During High-Power Microwave Breakdown in Air Using the Discontinuous Galerkin Time-Domain Method

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