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Zeroth radial modes of azimuthal surface waves in dense plasma-loaded, coaxial helix traveling-wave-tube-like waveguides

Girka, Igor O.; Pavlenko, Ivan V.; Thumm, Manfred

Abstract (englisch):
An analytical model of coaxial traveling-wave-tube-like waveguides with plasma filling has been justified and utilized to analyze the eigenmodes. Very often, introducing plasma into vacuum electronic devices leads to essential advantages as compared with evacuated tubes. The cylindrical structure under the present consideration consists of a central dielectric rod, placed inside a plasma coaxial layer with a metallic helix sheath on its outer interface, and a metal screen separated from the plasma by another dielectric layer. The dispersion properties of electromagnetic waves propagating across the external axial static magnetic field in such traveling-wave-tube-like waveguides are studied and summarized. The presence of a dense plasma coaxial layer makes the media nontransparent for waves in the electron cyclotron frequency range. However, surface type electromagnetic waves can propagate in this case. These waves are called azimuthal surface waves (ASWs). The helix sheath causes coupling of ordinarily and extraordinarily polarized ASWs. The zeroth radial ASW modes have been found to be most dangerous for parasitic wave excitation in dense plasma-loaded, coaxial traveling-wave-tube-like waveguides.

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Verlagsausgabe §
DOI: 10.5445/IR/1000132291
Frei zugänglich ab 01.05.2022
Zugehörige Institution(en) am KIT Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM)
Institut für Hochfrequenztechnik und Elektronik (IHE)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 30.04.2021
Sprache Englisch
Identifikator ISSN: 1070-664X, 1089-7674
KITopen-ID: 1000132291
HGF-Programm 31.13.02 (POF IV, LK 01) Plasma Heating & Current Drive Systems
Erschienen in Physics of plasmas
Verlag American Institute of Physics (AIP)
Band 28
Heft 4
Seiten 043106
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