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Back Cover: The ignition properties of He discharges inside a dielectric tube with varing diameters are studied with a 2D fluid model. Effects of the tube size on the ignition voltage, and the discharge morphology such as annulus and volume contraction are presented. While satisfying the precondition of experimental observations, the modelling further provides physical insight into the discharge dynamics...
A numerical study on the ignition properties of helium discharge confined in a dielectric tube is conducted with a fluid model. As the tube radius R increasing from 50 µm to 3 mm, the ignition voltage firstly reduces, then increases after R exceeding 1 mm. An ion sheath is formed between the discharge channel and the tube wall. The width of sheath decide whether a ring‐shape or a solid‐shape discharge...
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