Abstract
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.
Highlights
Atmospheric pressure glow discharge (APGD) has received increasing attention all over the world in recent years, as it is an advantageous way to obtain non-equilibrium plasma at atmospheric pressure without using expensive vacuum equipment
The typical structure of discharge in the experiment was similar to the direct current (DC) glow discharge in ambient air at atmospheric pressure described by David Staack et al.[31]
It might imply that under the action of higher frequency more residual electrons were likely to be left in the discharge area and these electrons could be the initial ones for different electron avalanches
Summary
Atmospheric pressure glow discharge (APGD) has received increasing attention all over the world in recent years, as it is an advantageous way to obtain non-equilibrium plasma at atmospheric pressure without using expensive vacuum equipment. In order to extend the application of this kind of APGD, we focus on how to make it more diffusive in a large area It is well-known that using external magnetic field can effectively increase the collision ionization of low-pressure glow discharge. Pekarek studied the effect of a stationary magnetic field on the production of ozone from air at atmospheric pressure by a negative corona discharge in a cylindrical electrode configuration He found that the magnetic field extended the current voltage range of the discharge and the increasement of an approximately 30% higher ozone concentration produced by the discharge could be obtained without additional energy requirements by using a magnetic field.[30]. It will be shown that stable and diffusive APGD can be obtained in a circular air gap (diameter 20 mm) by using a transverse magnetic field
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