Plasma and Fusion Research
Online ISSN : 1880-6821
ISSN-L : 1880-6821
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Experimental Study of Slow Cyclotron Maser Operation in Weakly Relativistic Region
Kiyoshi BANSHOKazuo OGURAHiroaki OEYusuke KAZAHARIHiroshi IIZUKAAkira SUGAWARATakashi SHIMOZUMASakuji KOBAYASHIKohji OKADA
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2010 Volume 5 Pages S1049

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Abstract

Studies of slow cyclotron maser operation of a slow-wave device are presented. The beam voltage is weakly relativistic, less than 100 kV. The slow-wave structure is a periodically corrugated oversized waveguide for K-band operation. When using rectangular corrugation having a relatively small ratio of corrugation width to periodic length of about 20 %, the dispersion curve near the upper cut-off becomes flat and second harmonic slow cyclotron maser operation is observed in the low-energy region near 30 kV. Another type of combined resonance of Cherenkov and slow cyclotron interaction is also demonstrated in which an absolute instability is driven by the slow cyclotron interaction. By using sinusoidal corrugation and rectangular corrugation having a 50 % ratio of corrugation width to periodic length, amplification effects due to the fundamental and second harmonic slow cyclotron interactions are observed.

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© 2010 by The Japan Society of Plasma Science and Nuclear Fusion Research
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