Effect of lost charged particles on the breakdown characteristics of the gaseous electrical discharge in non-uniform axial electric field

Noori, H.; Ranjbar, A. H.

doi:10.1063/1.4996878

Cited by 6 publications

(2 citation statements)

References 14 publications

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“…Though making the formula simple and generally clear, the assumption of constant electric field is physically less appropriate and often violated, which might result in unexpected misbehaviors in calculating the breakdown voltages. The effect of the electric field non-uniformity on Paschen's curve in macrogaps can be found in [25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Evaluating microgap breakdown mode transition with electric field non-uniformity

Fu¹,

Krek²,

Zhang³

et al. 2018

Plasma Sources Sci. Technol.

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This paper evaluates the transitions between the breakdown modes that are dominated by field emission (FE) and by secondary electron emission (SEE) in argon microgaps, based on a mathematical model originally proposed for the modified Paschen's curve (Go and Pohlman 2010 J. Appl. Phys. 107 103303). In the present model, instead of assuming a constant electric field across the gap, the spatial distribution of the electric field due to the presence of a parabolic cathode protrusion is implemented, and a modification of the first Townsend ionization coefficient for microscale gaps from particle-in-cell/Monte Carlo collision simulations is employed (Venkattraman and Alexeenko 2012 Phys. Plasmas 19 123515). The breakdown mode transitions are quantified by the variations of gas pressure and gap distance. It is found that assuming a constant electric field across the gap will overestimate the electron avalanche, which underestimates the breakdown voltage and shifts the breakdown mode transitions to a smaller gap. By varying the field enhancement factor, the critical point of the breakdown mode transition can be significantly adjusted. Increasing the field enhancement factor will lower the breakdown voltage in the FE regime and increase the breakdown voltage in the SEE regime.

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Section: Introductionmentioning

confidence: 99%

Evaluating microgap breakdown mode transition with electric field non-uniformity

Fu¹,

Krek²,

Zhang³

et al. 2018

Plasma Sources Sci. Technol.

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show abstract

“…On the other hand, Ling and Zhu [48] and Noori et al [49,50] investigated the effect of the particle diffusion loss in the breakdown. They found that the loss of ions has a small impact on the breakdown, so the radial diffusion of electrons is the main source of loss.…”

Section: Derivation Of the Breakdown Model In Pdmentioning

confidence: 99%

Numerical simulation of gas breakdown characteristics in porous dielectric and theoretical analysis based on the capillary network model

Chen¹,

Yao²,

Mao³

et al. 2023

Plasma Sources Sci. Technol.

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Gas discharge in heterogeneous porous dielectric (PD) is becoming a reliable and popular low-temperature plasma technique in surface modification and plasma catalysis. However, the exact breakdown characteristics in the porous dielectric are not well studied due to experimental and diagnostic limitations. In this paper, a fluid model is then used to simulate the gas breakdown characteristics in real PD. It is found that the breakdown will selectively occur in porous dielectrics. The spatial distribution of PD determines regions of local breakdown. Varitions in pressure result in the rearrangement of breakdown probability in each region of PD so that breakdown regions will change. In order to explain the selective breakdown phenomenon, based on the assumption that a porous dielectric can be simplified into a network consisting of multiple curved capillaries, we developed a theoretical model of the breakdown in a capillary network. Three geometrical factors, i.e., capillary tortuosity, capillary radius, and line porosity, are taken into the model to account for the effect of electric field distortion and electron loss on the dielectric walls in the presence of PD. The calculated results explain the selective breakdown phenomenon occurring in the numerical simulation. This paper simulates the breakdown in a real porous dielectric and provides a quantitative theoretical model to analyze the effect of porous dielectric geometry on the breakdown. This paper will also provide insights into the design of optimal parameters for porous dielectric discharge (PDD) in surface modification and plasma catalysis.

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A modified expression for breakdown voltage of Townsend discharge in a non-uniform electric field and uniform axial magnetic field

Noori

Jõgi

2022

Physics Letters A

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Effect of lost charged particles on the breakdown characteristics of the gaseous electrical discharge in non-uniform axial electric field

Cited by 6 publications

References 14 publications

Evaluating microgap breakdown mode transition with electric field non-uniformity

Evaluating microgap breakdown mode transition with electric field non-uniformity

Numerical simulation of gas breakdown characteristics in porous dielectric and theoretical analysis based on the capillary network model

A modified expression for breakdown voltage of Townsend discharge in a non-uniform electric field and uniform axial magnetic field

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