Monte Carlo simulation of surface-charging phenomena on insulators prior to flashover in vacuum

Kai Kun Yu, Guan Jun Zhang, Nan Zheng, Yevgeny Raitses, Nathaniel J. Fisch

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

Before flashover across an insulator under high electric field in vacuum, there are charging phenomena occurring on the insulator surface, which significantly affect the developing process of flashover. Based on the secondary-electron-emission-avalanche model and by using the Monte Carlo method, a 2-D analysis of surface charge density on cylindrical and conical insulators prior to flashover in vacuum has been performed under unipolar voltage. Different materials are employed, i.e., alumina ceramic, PTFE, PMMA, and PI. The influences of materials, voltage amplitudes, and coning angles on charge distribution are investigated. The results reveal that negative charges exist in a small surface region near the cathode, while the surface charges positive in a larger region away from the cathode. With increasing applied voltage, both the negative charge density and region decrease, and even vanish, whereas both the positive charge density and region increase, and the peaks of both regions move toward the cathode. For the conical insulator with a negative angle, the positive charge density is greater than that with a positive angle, and the simulation describes well experimental data relating the coning angle, the surface charge, and the flashover voltage.

Original languageEnglish (US)
Pages (from-to)698-704
Number of pages7
JournalIEEE Transactions on Plasma Science
Volume37
Issue number5
DOIs
StatePublished - Apr 7 2009

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Keywords

  • Electron emission
  • Flashover
  • Monte Carlo method
  • Surface charging
  • Vacuum insulation

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