The surface of cylindrical insulators placed in high vacuum becomes positively charged when subjected to a high-voltage stress parallel to the dielectric surface. A study is made of the variation of the surface charge density as a function of the voltage applied to insulators made of alumina ceramic, nylon, Teflon® and Plexiglas®. Direct and pulsed voltages were used in the experiments.
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Tourrell et al. (1972) studied this question.
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