純ニッケル電極のコンディショニング初期過程における局所汚損点と真空中の絶縁破壊箇所との関係

カテゴリ: 論文誌(論文単位)

グループ名: 【A】基礎・材料・共通部門

発行日: 2021/03/01

タイトル(英語): Relationship between Local Contaminated Positions and Breakdown Points in Vacuum under Initial Conditioning Process of Pure Nickel Electrode

著者名: 西山　真史（埼玉大学 理工学研究科），山納　康（埼玉大学 理工学研究科／筑波大学 数理物質系），糸賀　大剛（（株）エム・ディ・インスツルメンツ），土肥　元達（（株）エム・ディ・インスツルメンツ）

著者名(英語): Masashi Nishiyama (Saitama University), Yasushi Yamano (Saitama University/University of Tsukuba), Hirotaka Itoga (MD INSTRUMENTS MFG. CO., LTD.), Motomichi Doi (MD INSTRUMENTS MFG. CO., LTD.)

キーワード: X線管，真空，純ニッケル電極，局所汚損点，絶縁破壊箇所　　X-ray tube，vacuum，pure nickel electrode，local contaminated position，breakdown point

要約(英語): For focusing electrodes of X-ray tube, a high voltage performance in vacuum is required from an initial conditioning process. In order to obtain a high voltage performance in a vacuum, it is necessary to clarify the breakdown factor and its mechanism for a vacuum electrode gap in the initial conditioning process. In this study, a vacuum breakdown test was performed using pure nickel electrodes that had been polished and heat-treated at various temperatures, and we investigated the relationship between the local contamination point on the electrode surface and the dielectric breakdown point. As a result, it was clarified that the high voltage performance was improved by smoothing the electrode surface using both magnetic polishing and electro polishing. With carefully observing the electrode surface by SEM, it was found that the trace of breakdown events appeared in the local contaminated point after several breakdown shots of the initial stage of conditioning. Moreover, it was found that the vacuum breakdown appeared in the edge of local contaminated area. It was suggested that the interface between the electrode, vacuum, and the local contaminated point was one of the weak point of electrical insulation.

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.141 No.3 （2021） 特集：放電・プラズマ・パルスパワー研究の最新動向

本誌掲載ページ: 172-178 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejfms/141/3/141_172/_article/-char/ja/