Weakly Relativistic K-Band Oversized Backward Wave Oscillator with Bragg Reflector at Beam Entrance of Slow Wave Structure

Kazuo OGURA; Yushi MIYAZAWA; Hidekazu TANAKA; Yutaka KIUCHI; Satoshi AOYAMA; Akira SUGAWARA

doi:10.1585/pfr.2.S1041

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Weakly Relativistic K-Band Oversized Backward Wave Oscillator with Bragg Reflector at Beam Entrance of Slow Wave Structure

Kazuo OGURA, Yushi MIYAZAWA, Hidekazu TANAKA, Yutaka KIUCHI, Satoshi AOYAMA, Akira SUGAWARA

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Keywords: oversized backward wave oscillator, periodic slow wave structure, weakly relativistic electron beam, K-band, Bragg reflector

JOURNAL FREE ACCESS

2007 Volume 2 Pages S1041

DOI https://doi.org/10.1585/pfr.2.S1041

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Abstract

We report an oversized K-band backward wave oscillator (BWO) operating above 20 GHz in the weakly relativistic region less than 100 kV. It is very important to prevent microwave from going into the beam diode, since intense microwaves will harmfully affect beam generation. A weakly relativistic oversized BWO is demonstrated using a Bragg reflector at the beam entrance of slow wave structure (SWS). The effect of the Bragg reflector on the BWO operation is examined, by changing the boundary condition at the beam entrance. The Bragg reflector improves the performance of the oversized BWO.

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