Secondary Ionization Coefficient of MgO and Accumulated Charge

Suzuki, Susumu; Sekizawa, Takashi; Kashiwagi, Yasuhide

doi:10.1143/jjap.50.106002

Cited by 4 publications

(4 citation statements)

References 23 publications

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“…A background gas pressure ( p 0 ) of 1–100 Torr is considered assuming a constant temperature of 0 °C. Thus the considered pd values ( p 0 d ) range from 0.2 to 20 Torr·cm, which coincides roughly with a common pd range in experimental studies [4–7].…”

Section: Numerical Modelsupporting

confidence: 82%

“…In many experiments, γ ′ often decreases with E/p 0 [4–6,22]. This tendency corresponds to the characteristics in case (i) and suggests that the effects of the nonionic processes are actually significant.…”

Section: Resultsmentioning

confidence: 68%

“…The spatially averaged α ′ over the discharge gap (\documentclass{article}\usepackage{amsmath}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{amsfonts}\pagestyle{empty}\begin{document}$ \langle \alpha' \rangle = \frac{1}{d} \int_0^d \alpha' \, \mathrm{d}z $ \end{document}), which includes the flat boundary regions beside the electrodes, becomes ∼13.4 cm −1 . The experimental studies take into account the effects of the boundary regions to evaluate α from the observed V bd [6,8]. In this study, the effects of the boundary regions are also considered to deduce γ ′ as experiments by using the spatially averaged 〈 α ′〉.…”

Section: Resultsmentioning

confidence: 99%

“…One of the most practical methodologies to evaluate γ i for lower energy ions is using the Townsend breakdown criterion in the narrow‐gap DBD: [4–7] …”

Section: Introductionmentioning

confidence: 99%

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Effects of secondary electron emission coefficients on Townsend's second ionization coefficient in argon dielectric barrier discharges

Yoshinaga

Akashi

2014

IEEJ Transactions Elec Engng

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One-dimensional fluid model simulations are performed to investigate how the secondary electron emission arising from ions (γ i ), metastable atoms (γ m ), and photons (γ p ) affect Townsend's second ionization coefficient (γ ) in argon dielectric barrier discharges. Since Townsend's breakdown criterion determines the value of γ , it is naturally affected by the discharge condition such as the reduced electric field (E /p) as well as the combination of γ i , γ m , and γ p . It also depends on the other contributions from the indirect ionization processes such as cumulative ionizations or metastable-metastable collision ionizations. When the nonionic electron-yielding processes such as the effects of γ m , γ p , and the indirect ionizations are considered, the calculated γ increases largely under the higher pd (pressure times distance) branch of the Paschen curve. Since the experimental characteristics of γ , which decreases with E /p, can hardly be explained without such nonionic processes, the contributions of those processes can be quite important in Townsend discharges especially under high pd conditions. These processes tend not to appear and γ tends to converge to γ i under the lower pd branch of the Paschen curve. The value of γ i can possibly be estimated by using γ under the lower pd condition.

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Section: Numerical Modelsupporting

confidence: 82%

Section: Resultsmentioning

confidence: 68%

Section: Resultsmentioning

confidence: 99%

“…One of the most practical methodologies to evaluate γ i for lower energy ions is using the Townsend breakdown criterion in the narrow‐gap DBD: [4–7] …”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations