Azimuthal mode coupling in coaxial waveguides and cavities with longitudinally corrugated insert

Ioannidis, ZC; Avramides, KA; Latsas, GP; Tigelis, IG

dc.contributor.author	Ioannidis, ZC	en
dc.contributor.author	Avramides, KA	en
dc.contributor.author	Latsas, GP	en
dc.contributor.author	Tigelis, IG	en
dc.date.accessioned	2014-03-01T01:35:21Z
dc.date.available	2014-03-01T01:35:21Z
dc.date.issued	2011	en
dc.identifier.issn	0093-3813	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/21011
dc.subject	Coaxial cavities	en
dc.subject	corrugated waveguides	en
dc.subject	coupled modes	en
dc.subject	gyrotron	en
dc.subject	oscillator	en
dc.subject.classification	Physics, Fluids & Plasmas	en
dc.subject.other	Analytical approach	en
dc.subject.other	Azimuthal modes	en
dc.subject.other	Characteristic equation	en
dc.subject.other	Coaxial cavity	en
dc.subject.other	Coaxial waveguides	en
dc.subject.other	Corrugated waveguide	en
dc.subject.other	Coupled mode	en
dc.subject.other	Eigenvalue spectra	en
dc.subject.other	Field components	en
dc.subject.other	Field distribution	en
dc.subject.other	Full-wave approach	en
dc.subject.other	High frequency HF	en
dc.subject.other	High-power	en
dc.subject.other	Homogeneous surfaces	en
dc.subject.other	Numerical calculation	en
dc.subject.other	oscillator	en
dc.subject.other	Resonant cavity	en
dc.subject.other	Spatial harmonic	en
dc.subject.other	Surface corrugations	en
dc.subject.other	Eigenvalues and eigenfunctions	en
dc.subject.other	Gyrotrons	en
dc.subject.other	Waveguides	en
dc.title	Azimuthal mode coupling in coaxial waveguides and cavities with longitudinally corrugated insert	en
heal.type	journalArticle	en
heal.identifier.primary	10.1109/TPS.2011.2118766	en
heal.identifier.secondary	5729835	en
heal.identifier.secondary	http://dx.doi.org/10.1109/TPS.2011.2118766	en
heal.language	English	en
heal.publicationDate	2011	en
heal.abstract	Coaxial resonant cavities with longitudinal corrugations on the inner conductor are used in high-frequency high-power gyrotrons as means to reduce the number of possible competing modes. For a sufficiently large number of corrugations, the analytical approach usually treats the surface corrugation as a homogeneous surface impedance to obtain simple formulas for the characteristic equation and field components. These formulas can be introduced to interaction codes in a quite straightforward way. Full-wave approaches that account for the azimuthal periodicity of the structure and consider azimuthal spatial harmonics to describe the field distributions have been also employed, increasing though the complexity of the solution and the effort given in numerical calculations. In this paper, a full-wave code is used in an attempt to identify the way that the azimuthal spatial terms contribute to the reformation of the eigenvalue spectrum and propose a criterion for the selection of the spatial terms that should be taken into account for accurate enough calculations. © 2011 IEEE.	en
heal.publisher	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC	en
heal.journalName	IEEE Transactions on Plasma Science	en
dc.identifier.doi	10.1109/TPS.2011.2118766	en
dc.identifier.isi	ISI:000290540000003	en
dc.identifier.volume	39	en
dc.identifier.issue	5	en
dc.identifier.spage	1213	en
dc.identifier.epage	1221	en