Main-discharge formation and light emission in pure Ar gas at multi-atmospheric pressure using the automatically pre-ionized plasma electrode

Hong, Sung-Ki; Hayashi, Nobuya; Ihara, Satoshi; Satoh, Saburoh; Yamabe, Chobei

doi:10.1016/j.vacuum.2005.01.006

Cited by 1 publication

(1 citation statement)

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“…For example, Hidaka and Murooka [12] investigated surface discharge development in a needle-to-disc configuration at atmospheric pressure in air and found the discharge propagation speed to be up to 8.4 × 10 8 cm s −1 for negative streamers and 1.5×10 9 cm s −1 for positive streamers. Hong [13] studied corona discharges over a cylindrical surface in multi-atmospheric pressure Ne and found the azimuthal discharge propagation speed to be in the range 10 7 -10 8 cm s −1 . Walter [14] investigated surface corona discharges having different dielectric materials and showed that higher dielectric constants lead to better laser performance by allowing more energy deposition into the gas mixture.…”

Section: Introductionmentioning

confidence: 99%

Surface corona-bar discharges for production of pre-ionizing UV light for pulsed high-pressure plasmas

Xiong¹,

Kushner²

2010

J. Phys. D: Appl. Phys.

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Multi-atmospheric pressure, pulsed electric discharge excited lasers require pre-ionization to produce spatially uniform glows. Many such systems use corona bars to produce ultraviolet (UV) and vacuum ultraviolet (VUV) light as photo-ionization sources for this purpose. Corona bars are transient surface discharges, typically in a cylindrical geometry, that sustain high electron temperatures and so are efficient UV and VUV sources. In this paper, results from a numerical study of surface corona-bar discharges in a multi-atmosphere pressure Ne/Xe gas mixture are discussed. The discharge consists of a high-voltage electrode placed on the surface of a corona bar which is a dielectric tube surrounding a cylindrical metal electrode. After the initial breakdown an ionization front propagates along the circumference of the corona bar and produces a thin plasma sheet near the dielectric surface. The propagation speed of the ionization front ranges from 2 × 10 7 to 3.5 × 10 8 cm s −1 , depending on the applied voltage and dielectric constant of the corona-bar insulator. As the discharge propagates around the circumference, the surface of the corona-bar is charged. The combined effects of surface curvature and charge deposition result in a non-monotonic variation of the electric field and electron temperature as the ionization front traverses the circumference. The UV fluxes collected on a surrounding circular surface correlate with the motion of the ionization front but with a time delay due to the relatively long lifetime of the precursor to the emitting species Ne * 2 .

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Section: Introductionmentioning

confidence: 99%