[Table of Contents]

Plasma and Fusion Research

Volume 6, 2401039 (2011)

Regular Articles


Experimental Study on Backward Wave Oscillation Based on Cylindrical Surface Wave of Smith-Purcell Free Electron Laser
Kazuo OGURA, Kiyoyuki YAMBE, Hiroyuki YOSHIMURA and Masatoh TAKAHASHI
Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan
(Received 6 December 2010 / Accepted 1 March 2011 / Published 1 July 2011)

Abstract

Backward wave oscillation based on a cylindrical surface wave of Smith-Purcell free electron laser (SP-FEL) is demonstrated. The SP-FEL is composed of a metal cylinder having a periodically corrugated wall and a surrounding hollow straight waveguide. Corrugation parameters are those used in K-band backward wave oscillators (BWOs). The metal cylinder has a surface wave due to the corrugation. The cylindrical surface wave is excited by an axially injected coaxial annular beam. Radiations due to the backward wave oscillation based on the cylindrical surface wave are examined in a weakly relativistic region less than 100 kV. An oscillation starting voltage exists for the backward wave oscillation as in the case of hollow oversized BWO. The frequencies are in K-band and are determined by the cylindrical corrugation. Radiations up to tens of kW are obtained.


Keywords

cylindrical surface wave, periodical corrugation, backward wave oscillation, Smith-Purcell radiation, weakly relativistic region, cold cathode

DOI: 10.1585/pfr.6.2401039


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This paper may be cited as follows:

Kazuo OGURA, Kiyoyuki YAMBE, Hiroyuki YOSHIMURA and Masatoh TAKAHASHI, Plasma Fusion Res. 6, 2401039 (2011).