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Starting Currents for Eigenmodes of a Gyrotron Cavity With Mode Conversion

Maksimenko, Aleksandr V.; Shcherbinin, Vitalii I.; Hlushchenko, Anton V.; Tkachenko, Viktor I.; Avramidis, Konstantinos A.; Jelonnek, John

Abstract (englisch):
In the fixed-field (cold) approximation, a generalized formula is derived for the starting currents of eigenmodes excited by an electron beam in a gyrotron cavity with the mode conversion. Tapered gyrotron cavities with gradual and abrupt transitions are considered as examples. It is shown that the effect of the mode conversion on the starting current consists mainly in the change of the diffractive quality factor and, therefore, is small for cavities with low diffractive losses. For such cavities, our formula is in good agreement with single-mode, self-consistent (hot) calculations of the electron beam-wave interaction. The agreement degrades for high-order axial modes having clear-cut distinctions of cold and hot fields. The derived formula is used to test the validity of the single-mode approximation for a complex gyrotron cavity with the abrupt change in radius.



Originalveröffentlichung
DOI: 10.1109/TED.2019.2893888
Zugehörige Institution(en) am KIT Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM)
Publikationstyp Zeitschriftenaufsatz
Jahr 2019
Sprache Englisch
Identifikator ISSN: 0018-9383, 1557-9646
KITopen-ID: 1000091648
HGF-Programm 31.03.02 (POF III, LK 01)
Erschienen in IEEE transactions on electron devices
Band 66
Heft 3
Seiten 1552 - 1558
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