Investigation of Moving Striations in a Low-Pressure Hg-Ar Discharge : I. Evaluation of Electron Temperature near the Reignition Region

概要

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When discharge tubes filled with low-pressure Hg-Ar gas are operated on a commercial ballast (at 50 or 60 Hz), they generate moving striations with decreasing ambient temperature. It was considered, in previous studies, that this phenomenon is caused by the high electron temperature in the reignition region of ac discharges below the ambient temperature. Saturated Hg vapor pressure decreases with decreasing ambient temperature. As a result, it is considered that the kinetic energy of electrons consumed for the excitation and ionization of Hg atoms decreases rapidly and the electron temperature of the high-energy part Tt, based on the assumption of a non-Maxwellian distribution function for energetic electrons, is raised above the excited or ionized levels of Ar gas. It is thought that this steep rise of the electron temperature in the reignition region induces the unstable discharges. It is confirmed by ac discharge simulation that the maximum of Tt values increases with decreasing in ambient temperature and Ar filling pressure.
社団法人応用物理学会の論文
1999-02-15