Emission characteristics of dispenser cathodes with a fine-grained tungsten top layer

S. Kimura, T. Higuchi, Y. Ouchi, Uda, O. Nakamura, T. Sudo, K. Koyama

研究成果査読

9 被引用数 (Scopus)

抄録

In order to improve the emission stability of the Ir-coated dispenser cathode under ion bombardment, a fine-grained tungsten top layer was applied on the substrate porous tungsten plug before Ir coating. The emission characteristics were studied after being assembled in a CRT gun. Cathode current was measured under pulse operation in a range of 0.1-9% duty. Remarkable anti-ion bombardment characteristics were observed over the range of 1-6% duty. The improved cathode showed 1.5 times higher emission current than that of a conventional Ir-coated dispenser cathode at 4% duty. AES analysis showed that the recovering rates of surface Ba and O atoms after ion bombardment were 2.5 times higher. From these results it is confirmed that the Ir coated cathode with a fine-grained tungsten top layer is provided with a good tolerance against the ion bombardment.

本文言語English
ページ(範囲)60-63
ページ数4
ジャーナルApplied Surface Science
111
DOI
出版ステータスPublished - 1997 2

ASJC Scopus subject areas

  • 化学 (全般)
  • 凝縮系物理学
  • 物理学および天文学(全般)
  • 表面および界面
  • 表面、皮膜および薄膜

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