Electron gun using carbon-nanofiber field emitter

Y. Sakai, A. Haga, S. Sugita, S. Kita, S. I. Tanaka, F. Okuyama, N. Kobayashi

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


An electron gun constructed using carbon-nanofiber (CNF) emitters and an electrostatic Einzel lens system has been characterized for the development of a high-resolution x-ray source. The CNFs used were grown on tungsten and palladium tips by plasma-enhanced chemical-vapor deposition. Electron beams with the energies of 10<E<20 keV were focused by the electrostatic lens and impinged on a W target for x-ray radiography. Analyzing the recorded x-ray radiographs, the focal spot size of the electron beam extracted from the CNFs was estimated to be D<50 μm in diameter. Superior performance was realized by using CNFs with larger fiber radii (100-500 nm) grown sparsely on the metal tips, which were installed in a holder at the short length L=0.5 mm.

Original languageEnglish
Article number013305
JournalReview of Scientific Instruments
Issue number1
Publication statusPublished - 2007
Externally publishedYes

ASJC Scopus subject areas

  • Instrumentation


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