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High-Q Cavity With Distributed Bragg Reflector for Second-Harmonic Gyrotrons Driven by Low-Power Electron Beams

Shcherbinin, Vitalii I. 1; Thumm, Manfred 1,2; Jelonnek, John 1,2
1 Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM), Karlsruher Institut für Technologie (KIT)
2 Institut für Hochfrequenztechnik und Elektronik (IHE), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

A cavity with distributed Bragg reflector (DBR) resonator is considered as a new design solution intended to improve output efficiencies of terahertz gyrotrons. The DBR is
formed by a cylindrical sapphire tube and a hollow layer. It is optimized to provide ultra-low ohmic losses of a selected operating mode due to field shielding of the metal resonator wall. It is shown that the frequency of this mode and its coupling with an electron beam are slightly affected by the DBR. It is found that the DBR resonator initiates minor mode conversion, resulting in high output purity of the operating mode. Using a second-harmonic 0.5-THz gyrotron powered by a 1-kW electron beam as an example, it is shown that the sapphire DBR enables 10-fold increase in the peak output efficiency from 1% to 10%.


Zugehörige Institution(en) am KIT Institut für Hochfrequenztechnik und Elektronik (IHE)
Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM)
Publikationstyp Proceedingsbeitrag
Publikationsmonat/-jahr 04.2023
Sprache Englisch
Identifikator ISBN: 978-1-66547-321-7
KITopen-ID: 1000160666
HGF-Programm 31.13.02 (POF IV, LK 01) Plasma Heating & Current Drive Systems
Erschienen in 24th International Vacuum Electronics Conference (IVEC)
Veranstaltung 24th International Vacuum Electronics Conference (IVEC 2023), Chengdu, China, 26.04.2023 – 28.04.2023
Verlag Institute of Electrical and Electronics Engineers (IEEE)
Seiten 1–2
Schlagwörter Gyrotron, metal cavity, distributed Bragg, reflector, ohmic losses, output efficiency
Nachgewiesen in Dimensions
Scopus
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