Plasma and Fusion Research
Online ISSN : 1880-6821
ISSN-L : 1880-6821
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New Power Records of Sub-Terahertz Gyrotron with Second-Harmonic Oscillation
Teruo SAITOShinya OGASAWARANaoki YAMADAShinji IKEUCHIYoshinori TATEMATSURyosuke IKEDAIsamu OGAWAVladimir N. MANUILOV
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2012 Volume 7 Pages 1206003

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Abstract

High-power sub-terahertz pulse gyrotrons are under development in FIR FU for application to collective Thomson scattering (CTS) measurement on fusion plasmas, especially on high-density plasmas such as those produced in LHD. Recently, we achieved a new power record of 62 kW at approximately 388 GHz with second-harmonic (SH) oscillation. Following this result, we modified the electron gun of the gyrotron to couple the electron beam more strongly to another oscillation mode that has a peak coupling coefficient two times as large as that of the 62 kW mode. Oscillation tests with the new mode attained higher power of 83 kW at about 389 GHz. These results constitute new second-harmonic-oscillation power records for sub-terahertz gyrotrons.

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© 2012 by The Japan Society of Plasma Science and Nuclear Fusion Research
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