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Improved Mode Selection in Coaxial Cavities for Subterahertz Second-Harmonic Gyrotrons

Shcherbinin, Vitalii I.; Moskvitina, Yuliya K.; Avramidis, Konstantinos A.; Jelonnek, John

Abstract (englisch):
A coaxial metal rod with partial dielectric coating is considered as a means for efficient suppression of all volume competing modes in cavities for second-harmonic gyrotrons operated in whispering gallery modes. The rod radius is selected small enough to have only a slight effect on operating mode, which therefore remains insensitive to fabrication tolerances and a misalignment of the coaxial insert. By contrast, for the competing modes such a rod is shown to reduce the effective cavity length, thereby greatly increasing the starting currents. Such a method of mode selection is demonstrated to be more versatile, when compared to that provided by a tapered coaxial conductor. The advantage of a dielectric-coated coaxial insert is illustrated by the example of a cavity for a 100-kW 300-GHz pulsed gyrotron operated in the second-harmonic mode.

DOI: 10.1109/TED.2020.2996179
Zugehörige Institution(en) am KIT Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 07.2020
Sprache Englisch
Identifikator ISSN: 0018-9383, 1557-9646
KITopen-ID: 1000120635
HGF-Programm 31.03.02 (POF III, LK 01)
Plasma Heizsysteme
Erschienen in IEEE transactions on electron devices
Band 67
Heft 7
Seiten 2933–2939
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