Measurements are made for variations of the effective secondary emission coefficient γ with reduced field E/p. Plane-parallel copper electrodes (5 cm diameter) are sustained with a dc voltage (0<V<1 kV) and can be separated by a variable distance (2 mm<d<1 cm). Current–voltage characteristics, Paschen curves, and γ(E/p) variations are shown for various rare gases (neon, argon, krypton, and xenon). γ(E/p) values are deduced from Paschen curves and published α/p(E/p) variations by using the self-sustain condition. Comparisons are made with various experimental or calculated results taken from the literature.
This experimental study concerns the secondary emission coefficient γ for two dielectrics (MgO and enamel) used in plasma display panels. Different pure rare gases were considered at pressures varying from 5 to 50 Torr. Here, we present the variations of coefficient γ as a function of the reduced field E/p. They were obtained by introducing the breakdown voltages measured experimentally on a sample of plasma panel, into the self-sustained equation. Concerning a 0.5 μm thick MgO layer, results are shown for five gases (helium, neon, argon, krypton, and xenon) whereas for a 25 μm thick enamel layer, they are presented for neon and xenon.
Résumé : Nous avons développé un modèle numérique basé sur une méthode de Monte-Carlo, permettant de suivre, dans une cellule d'&crans à plasmas, le trajet des photons W responsables de l'émission de la lumière visible. Nous considérons pour cela un schéma cinétique simplifié permettant de créer ou de détruire de nouveaux photons. Nous présentons les résultats obtenus en fonction de la concentration de Xe dans le mélange Neme.
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