Field-emission enhanced breakdown in oxygen microdischarges from direct-current to radio-frequencies

Klas, M.; Matejčík, Štefan; Moravský, Ladislav; Radjenović, Branislav; Radmilović-Radjenović, M.

doi:10.1209/0295-5075/120/25002

Cited by 8 publications

(4 citation statements)

References 28 publications

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“…Levko and Raja studied the microwave breakdown process in the micro-gap under atmospheric pressure and found that the breakdown voltage of microwave and direct current (DC) micro-discharge under different gap lengths had different trends, when the gap length exceeded a critical value, only the initial seed electrons in the gap can cause microwave micro-discharge [19]. Klas et al studied the breakdown mechanism of oxygen micro-discharge under static, time-varying electric fields and radio frequencies through experiments, and the FE threshold determined by the experimental data is more consistent with the literature [20]. Meng et al evaluated the mechanism of pulse voltage micro-scale gas breakdown and showed that the DC micro-scale gas breakdown theory is also applicable to pulse breakdown, with Townsend avalanche mode transition to FE being driven breakdown [21].…”

Section: Introductionmentioning

confidence: 58%

Numerical simulation of the breakdown process of micro-discharge sustained by field emission

Guo¹,

Wu²,

Peng³

et al. 2022

J. Phys. D: Appl. Phys.

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Micro-discharge is the process that gas breakdown occurs on a small spatial scale to generate plasma. With the decrease of the discharge scale, the high electric field makes the field emission (FE) play a leading role in the breakdown process of the micro-discharge, which is one of the reasons that the breakdown voltage deviates from the Paschen curve in a small gap. A one-dimensional implicit particle-in-cell Monte Carlo collision (PIC/MCC) model is used to simulate the whole breakdown process of direct current (DC) micro-discharge sustained by FE in argon. The results show that the discharge after breakdown is in arc mode, the breakdown process can be divided into three stages: the pre-breakdown stage, the breakdown stage, and the post-breakdown stage. In the pre-breakdown stage, the sheath and plasma are not formed, the external electric field can penetrate the entire gap. In the breakdown stage, gas breakdown occurs. As the sheath is formed, the rate of change of plasma parameters increases rapidly and the discharge gap changes from capacitive to resistive. In the post-breakdown stage, the anode sheath gradually becomes thinner, but the region where the field is reversed still exists. The particle and energy balance gradually reach equilibrium, and the entire discharge evolves to a quasi-steady-state.

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Section: Introductionmentioning

confidence: 58%

Numerical simulation of the breakdown process of micro-discharge sustained by field emission

Guo¹,

Wu²,

Peng³

et al. 2022

J. Phys. D: Appl. Phys.

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“…First exact solutions for the time dependent transport were obtained by using Monte Carlo (MC) simulations [19] and numerical solutions to the time dependent Boltzmann equation [20,21]. Numerous approximate experimental and theoretical papers have been published on the breakdown in RF using simplified semi-analytic forms [22][23][24][25][26]. At the same time fluid, hybrid and particle-in-cell (PIC) models of RF plasmas include early stages of the growth of ionization [18,27,28].…”

Section: Introductionmentioning

confidence: 99%

Monte Carlo modeling of radio-frequency breakdown in argon

Savić

Marić

Radmilović-Radjenović

et al. 2018

Plasma Sources Sci. Technol.

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This paper contains results of the detailed simulation study of the breakdown in low-pressure radio-frequency argon discharges. Calculations were performed by using a Monte Carlo code including electrons only, assuming that the influence of heavy particles is negligible. The obtained results are in a good qualitative agreement with the available experimental data and clearly show multivalued nature of the left-hand branches of the breakdown voltage curves. Physical processes defining the breakdown conditions are analyzed based on the spatial profiles of electron density, local mean energy, number of elastic and ionization collisions. Under conditions where two breakdown values exist one could identify two regimes and two different balances between electron losses and production. From the dependence of the breakdown voltage on the product of the pressure and the interelectrode distance and frequency over the gas number density, similarity laws for radio-frequency breakdown have been reexamined.

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“…It is easy to appear small surface bulges, and cause local field amplification, so the electric field intensity below 10 8 V m −1 will also lead to field emission. 11,29) According to the breakdown voltage corresponding to the electrode gaps in Fig. 6.…”

Section: Analysis Of the Field Emissionmentioning

confidence: 99%

Analysis of gas discharge characteristics across micro-gap under different pressures

Li¹,

Sun²,

Sun³

et al. 2021

Jpn. J. Appl. Phys.

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To study the process of micro-gap gas discharge under different pressures, the experimental of the micro-discharges for the gaps ranging from 1 to 100 μm under 1-100 kPa is presented and the results are discussed. The curves of breakdown voltage with the pd value at different gaps are drawn and there are multiple breakdown voltages under the same pd value. As the decrease of the gaps, the deviation between the breakdown curve and the traditional Paschen curve increases when the electrode distance is less than 100 μm and the pd value is less than about 80 Pa•cm. The breakdown field strength and the ratio of effective secondary coefficient of field emission to Townsend's secondary coefficient are estimated at different pressures and different electrode gaps. The ion-enhanced field effect has been found to play an important role in field emission in several microns of electrode gaps.

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Field-emission enhanced breakdown in oxygen microdischarges from direct-current to radio-frequencies

Cited by 8 publications

References 28 publications

Numerical simulation of the breakdown process of micro-discharge sustained by field emission

Numerical simulation of the breakdown process of micro-discharge sustained by field emission

Monte Carlo modeling of radio-frequency breakdown in argon

Analysis of gas discharge characteristics across micro-gap under different pressures

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