论文信息 - Influence of surface roughness on the charging of insulating spacers in vacuum

Influence of surface roughness on the charging of insulating spacers in vacuum

This paper describes the charging phenomena of cylindrical insulators made of PMMA, PTFE, or Al2O3 under ramped and stepped dc voltage. It is primarily concerned with the influence of surface roughness on the formation of charging for various insulating spacers. By using an electrostatic probe located on the cathode, we conducted real-time observations of the electric field induced by the surface charge. It was found that the surface roughness positively affects the charging, which becomes more pronounced in insulators polished to a higher degree. Furthermore, polished insulators are characterized by a shorter time lag. These results show the importance of surface treatment for insulating spacers in vacuum. © 2001 Scripta Technica, Electr Eng Jpn, 135(3): 16–25, 2001

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