[Table of Contents]

Plasma and Fusion Research

Volume 3, S1078 (2008)

Regular Articles

Operation Characteristics of Microwave Sources Based on Slow-Wave Interactions in Rectangular Corrugations
Yuki TAKAMURA, Yusuke KAZAHARI, Hiroaki OE, Kazuo OGURA, Akira SUGAWARA and Mafumi HIRATA1)
Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan
1)
Plasma Research Center, University of Tsukuba, Tsukuba 305-8577, Japan
(Received 16 November 2007 / Accepted 27 March 2008 / Published 5 August 2008)

Abstract

Studies on slow-wave devices with a novel disk cathode and two types of rectangular corrugation are reported. The beam voltage is weakly relativistic, which is less than 100 kV. A disk cathode can generate a uniformly distributed annular beam in the weakly relative region. Rectangular corrugation having the ratio of the corrugation width to the periodic length of 50 or 20% is used. Using the former, output powers of about 200 kW are obtained at around 100 kV. For the latter, the effect of slow cyclotron resonance is observed in the low-energy region of around 30 kV. Output powers of slow cyclotron masers are in the range of a few hundred W. The operation mode of a slow cyclotron maser can be controlled between axisymmetric and nonaxisymmetric modes by changing the end condition of rectangular corrugation.

Keywords

slow-wave device, weakly relativistic region, disk cathode, annular electron beam, rectangular corrugation

DOI: 10.1585/pfr.3.S1078

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This paper may be cited as follows:

Yuki TAKAMURA, Yusuke KAZAHARI, Hiroaki OE, Kazuo OGURA, Akira SUGAWARA and Mafumi HIRATA, Plasma Fusion Res. 3, S1078 (2008).