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Jpn. J. Appl. Phys. 46 (2007) pp. 6051-6056  |Previous Article| |Next Article|  |Table of Contents|
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Numerical Study of Instabilities Induced by Sheet Electron Beam on Corrugated Metal Plate

Osamu Watanabe, Tsuguhiro Watanabe1, Kazuo Ogura2, Yoshinori Tatematsu3, Yoriko Shima, and Tsuyoshi Imai

Plasma Research Center, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan
1National Institute for Fusion Science, Oroshi-cho, Toki, Gifu 509-5292, Japan
2Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan
3Research Center for Development of Far-Infrared Region, University of Fukui, Fukui 910-8507, Japan

(Received February 5, 2007; accepted June 5, 2007; published online September 7, 2007)

It has been confirmed that the normal mode of a surface wave on a corrugated metal plate can be excited by a sheet electron beam. Two types of instabilities are analyzed numerically. One is the Cherenkov instability between the surface normal mode and the slow-space-charge mode of the electron beam. This instability is possibly absolute instability. The oscillation frequency of this instability can be controlled by the amplitude of the corrugation depth. The electron beam energy for this instability is determined by the ratio of the period length and the amplitude of the corrugation. Another is the Smith–Purcell-type instability. This instability is always convective-type instability. The oscillation frequency is higher than that of the above-mentioned Cherenkov instability and is in a broad band. The temporal growth rate of this instability is strongly reduced as the beam energy is reduced.

URL: http://jjap.jsap.jp/link?JJAP/46/6051/
DOI: 10.1143/JJAP.46.6051


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