Simulation and experimental study on tungsten field emission cathode

We have been developing a tungsten field emission cathode for a Cherenkov FEL or Smith–Purcell FEL. The properties of the electron beam from a tungsten tip have been investigated using numerical simulation and some experiments. Although the 2nd gate reduced the emission current due to a decrease of...

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Bibliographic Details
Published inNuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 429; no. 1; pp. 299 - 303
Main Authors Tsunawaki, Yoshiaki, Tokura, Yoshiko, Kusaba, Mitsuhiro, Nobuhisa Ohigashi, Mima, Kunioki, Fujita, Masayuki, Imasaki, Kazuo, Nakai, Sadao, Shiho, Makoto
Format Journal Article
LanguageEnglish
Published Elsevier B.V 1999
Subjects
Electron beam
Field emission
Tungsten cathode
Electron beam
Tungsten cathode
Field emission
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Summary:We have been developing a tungsten field emission cathode for a Cherenkov FEL or Smith–Purcell FEL. The properties of the electron beam from a tungsten tip have been investigated using numerical simulation and some experiments. Although the 2nd gate reduced the emission current due to a decrease of the effective field at the tungsten tip, it focused and enlarged the electron beam current in a certain potential range of the 2nd gate depending on the cathode voltage and the distance between 1st and 2nd gates. The electron beam diameter was reduced to ∼2 mm on the fluorescent screen at the anode.
ISSN:0168-9002
1872-9576
DOI:10.1016/S0168-9002(99)00132-1