The effect of frequency on atmospheric pressure glow discharge in a pin-to-plate gap sustained by a resonant power supply

Wang, Yong Sheng; Ding, Weidong; Wang, Ya Nan; Wang, Jia Chen; Li, Fang; Fan, Chuan

doi:10.1063/1.4953902

Cited by 15 publications

(1 citation statement)

References 19 publications

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“…One end of the filament rests on the cathode surface engulfed in the cathode glow, the other sits on the edge of the anode exit aperture. In accordance with generally accepted terminology, this part of the discharge is called the positive column [40][41][42]. The anode attachment of the discharge current channel is less than 1 mm in diameter.…”

Section: Resultsmentioning

confidence: 99%

Positive column dynamics of a low-current atmospheric pressure discharge in flowing argon

Savkin¹,

Окс²,

Сорокин³

et al. 2022

Plasma Sources Sci. Technol.

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We present the results of studies of a cold-plasma atmospheric pressure discharge in argon flow, in both DC and pulse-periodic modes. The burning voltage and the discharge current were 200 V and 15 mA in continuous mode; in pulse-periodic mode the voltage was 220 V and the current 15 mA for a pulse repetition rate of 100 kHz. Special attention was given to the positive column dynamics during the discharge stages of initiation, burning, and extinction. The main method of investigation employed optical diagnostics of the plasma in the visible range with high time resolution. The positive discharge column is shown to be a constricted current channel in the form of an elongated loop. In continuous mode, the length of the positive column, from anode attachment to inflection point outside the discharge system, is several millimeters. In pulsed mode, the positive column is an unsteady plasma formation, the length of which increases at about 4 m s−1, and reaches the same dimension over a time of order 1 ms. We find that the positive column plasma includes hydroxyl molecules OH, nitrogen N2, and atomic oxygen O I, along with atoms of the working gas argon. Observation of the time evolution of the optical emission from the plasma-forming gas shows that the plasma glow of the positive column is mainly determined by argon Ar I radiation, with maximum intensity at the trailing edge of the current pulse.

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Section: Resultsmentioning

confidence: 99%

Positive column dynamics of a low-current atmospheric pressure discharge in flowing argon

Savkin¹,

Окс²,

Сорокин³

et al. 2022

Plasma Sources Sci. Technol.

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show abstract

A diffusive atmospheric pressure glow discharge in a coaxial pin-to-ring gap with a transverse magnetic field

et al. 2017

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Atmospheric pressure glow discharge (APGD) has been widely used in the industrial field. The industrial applications are based on achieving stable and diffusive APGD in a relatively large space. The existing sources only achieved stable and diffusive APGD between a short inter-electrode distance within 5 millimeters. In this paper, the effect of a transverse stationary magnetic field on the diffusion of filamentary APGD was studied in a pin-to-ring coaxial gap. The APGD was driven by a high-voltage resonant power supply, and the stationary magnetic field was supplied by a permanent magnet. The stable and diffusive APGD was achieved in the circular area, which diameter was 20 millimeters. The experimental results revealed that more collision ionization occurred and the plasma was distributed diffusively in the discharge gap by applying the external transverse magnetic field. Besides, it is likely to obtain more stable and diffusive APGD in the coaxial pin-to-ring discharge gap when adjusting the input voltage, transverse magnetic flux density and resonant frequency of the power supply.

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Effect of pulsed discharge on the ignition of pulse modulated radio frequency glow discharge at atmospheric pressure

et al. 2018

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A pulsed discharge is introduced between two sequential pulse-modulated radio frequency glow discharges in atmospheric helium. The dependence of radio frequency discharge ignition on pulsed discharge intensity is investigated experimentally with the pulse voltage amplitudes of 650, 850, and 1250 V. The discharge characteristics and dynamics are studied in terms of voltage and current waveforms, and spatial-temporal evolution of optical emission. With the elevated pulsed discharge intensity of two orders of magnitude, the ignition of radio frequency discharge is enhanced by reducing the ignition time and achieving the stable operation with a double-hump spatial profile. The ignition time of radio frequency discharge is estimated to be 2.0 μs, 1.5 μs, and 1.0 μs with the pulse voltage amplitudes of 650, 850, and 1250 V, respectively, which is also demonstrated by the spatial-temporal evolution of optical emission at 706 and 777 nm.

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The effect of frequency on atmospheric pressure glow discharge in a pin-to-plate gap sustained by a resonant power supply

Cited by 15 publications

References 19 publications

Positive column dynamics of a low-current atmospheric pressure discharge in flowing argon

Positive column dynamics of a low-current atmospheric pressure discharge in flowing argon

A diffusive atmospheric pressure glow discharge in a coaxial pin-to-ring gap with a transverse magnetic field

Effect of pulsed discharge on the ignition of pulse modulated radio frequency glow discharge at atmospheric pressure

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