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 |
| 巻 | 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