Similarity theory and scaling laws for low-temperature plasma discharges: a comprehensive review

Fu, Yangyang; Wang, Huihui; Wang, Xinxin

doi:10.1007/s41614-022-00112-1

Cited by 22 publications

(7 citation statements)

References 282 publications

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“…The figure indicates a transition in discharge modes with varying resistance, moving from sub-glow to normal glow, and then to abnormal glow discharges. It is observed that during the sub-glow discharge phase, discharge similarity is nearly strictly fulfilled; in the normal glow discharge phase, it is almost satisfied; however, during the abnormal glow discharge phase, the similarity criterion is not met, presenting some discrepancies with findings in literature [6]. To better analyze the similarity between the two systems, we dissect the discharge processes under the same resistance in the three different discharge phases.…”

Section: Discussionmentioning

confidence: 90%

Optimization of Glow Discharge Cleaning for Enhanced Plasma Performance in ITER: A Study on Discharge Similarity and Electrode Configuration

Zhang,

Duan,

Miao

et al. 2023

Preprint

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Glow discharge is characterized by its uniform cleaning ability and simplicity in system structure, and has been a standard method for wall conditioning and treatment in Tokamak devices, particularly during the maintenance phase and following atmospheric exposure of the vacuum chamber. This study presents a two-dimensional fluid model of glow discharge that incorporates temperature parameters. The model simulates discharge characteristics under two scaled-down scenarios, revealing that during the sub-glow and normal glow discharge stages, both systems exhibit similar distributions of electron and positive ion densities, satisfying the criteria for discharge similarity. Furthermore, the temperature differences induced by the discharge are found to significantly influence the spatially reduced electric fields. This variation in reduced field strength leads to distinct distributions of charged particles, which is identified as the primary cause for the deviation from similarity during abnormal glow discharge phases.

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Section: Discussionmentioning

confidence: 90%

Optimization of Glow Discharge Cleaning for Enhanced Plasma Performance in ITER: A Study on Discharge Similarity and Electrode Configuration

Zhang,

Duan,

Miao

et al. 2023

Preprint

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“…The ion frequency is about four orders less than the electron frequency, which is due to both the lower cathode ion density and the large difference between electron and ion masses. After 10 ps, the frequency of the ultrafast oscillation reaches as high as ∼10 4 GHz. Although the electron frequency is lower than the oscillation frequency at t = 10 ps, it gradually increases as the discharge develops and aligns with the oscillation frequency at t = 13 ps, indicating that electrons can instantly respond to the oscillation whereas ions cannot.…”

Section: Resultsmentioning

confidence: 99%

“…Microdischarges that usually have at least one direction of the characteristic lengths less than one millimeter can be generated between the bounded anode and cathode electrodes [1][2][3][4]. The generated microplasma sources have the advantages of high electron density, high excitation efficiency, high-pressure * Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast oscillation in a field emission-driven miniaturized gaseous diode

Chen,

Lin,

Wang

et al. 2024

Plasma Sources Sci. Technol.

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We report an ultrafast oscillation (up to ∼ 10 4 GHz) in the early stage of field emission-driven microdischarges. Spatiotemporal behaviors of electron density, space charge density, and electric field, exhibiting high-frequency oscillations, are demonstrated based on first-principle particle-in-cell/Monte Carlo collision simulations. Intermittent electron emission fluxes are identified from the electron phase space distributions whereas the ions are rather non-oscillatory in the transient timescale. The mechanisms of oscillation with growing amplitude are found to be related to the rapid modification of the field emission current affected by the space charge electric field, which is also accompanied by the fast response of the electron transport and ionization in a dynamic double-layer sheath. Further, a transport equation for emission current is solved to estimate the oscillation frequency, which agrees well with the simulation results. This study provides a more precise understanding of the formation of the field emission-driven microdischarge, which informs the design and optimization of miniaturized gaseous electronic devices.

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“…The set of equations ( 8)-( 15) satisfies scaling laws [19]: in a given gas, the positive column plasma in a tube radius R depends on pR, I/R, and f/p, where f = ω/2π is the cyclic frequency. Stepwise ionization and volume recombination via binary collisions do not violate the scaling laws, which break in the presence of three-body collisions and substantial deviations from quasi-neutrality.…”

Section: Hybrid Model Of Positive Columnmentioning

confidence: 99%

Electron kinetics in a positive column of AC discharges in a dynamic regime

Humphrey

Kolobov

2023

Plasma Sources Sci. Technol.

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We have performed hybrid kinetic-fluid simulations of a positive column in AC Argon discharges over a range of driving frequencies f and gas pressure p for the conditions when the spatial nonlocality of the Electron Energy Distribution Function (EEDF) is substantial. Our simulations confirmed that the most efficient conditions of plasma maintenance are observed in the dynamic regimewhen time modulations of mean electron energy (temperature) are substantial. The minimal values of the root mean square (rms) electric field and the electron temperature have been observed at f/p values of about 3 kHz/Torr in a tube of radius R = 1 cm. The ionization rate and plasma density reached maximal values under these conditions.

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Similarity theory and scaling laws for low-temperature plasma discharges: a comprehensive review

Cited by 22 publications

References 282 publications

Optimization of Glow Discharge Cleaning for Enhanced Plasma Performance in ITER: A Study on Discharge Similarity and Electrode Configuration

Optimization of Glow Discharge Cleaning for Enhanced Plasma Performance in ITER: A Study on Discharge Similarity and Electrode Configuration

Ultrafast oscillation in a field emission-driven miniaturized gaseous diode

Electron kinetics in a positive column of AC discharges in a dynamic regime

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