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

S. Kimura, T. Higuchi, Y. Ouchi, [No Value] Uda, O. Nakamura, T. Sudo, K. Koyama

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)60-63
Number of pages4
JournalApplied Surface Science
Volume111
Publication statusPublished - 1997 Feb

Fingerprint

dispensers
Dispensers
Tungsten
Ion bombardment
tungsten
Cathodes
cathodes
bombardment
ions
Cathode ray tubes
plugs
coatings
Coatings
Atoms
Substrates
pulses
atoms

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Condensed Matter Physics

Cite this

Kimura, S., Higuchi, T., Ouchi, Y., Uda, N. V., Nakamura, O., Sudo, T., & Koyama, K. (1997). Emission characteristics of dispenser cathodes with a fine-grained tungsten top layer. Applied Surface Science, 111, 60-63.

Emission characteristics of dispenser cathodes with a fine-grained tungsten top layer. / Kimura, S.; Higuchi, T.; Ouchi, Y.; Uda, [No Value]; Nakamura, O.; Sudo, T.; Koyama, K.

In: Applied Surface Science, Vol. 111, 02.1997, p. 60-63.

Research output: Contribution to journalArticle

Kimura, S, Higuchi, T, Ouchi, Y, Uda, NV, Nakamura, O, Sudo, T & Koyama, K 1997, 'Emission characteristics of dispenser cathodes with a fine-grained tungsten top layer', Applied Surface Science, vol. 111, pp. 60-63.
Kimura S, Higuchi T, Ouchi Y, Uda NV, Nakamura O, Sudo T et al. Emission characteristics of dispenser cathodes with a fine-grained tungsten top layer. Applied Surface Science. 1997 Feb;111:60-63.
Kimura, S. ; Higuchi, T. ; Ouchi, Y. ; Uda, [No Value] ; Nakamura, O. ; Sudo, T. ; Koyama, K. / Emission characteristics of dispenser cathodes with a fine-grained tungsten top layer. In: Applied Surface Science. 1997 ; Vol. 111. pp. 60-63.
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