Design considerations for powerful continuous-wave second-cyclotron-harmonic coaxial-cavity gyrotrons

Avramides, KA; Iatrou, CT; Vomvoridis, JL

dc.contributor.author	Avramides, KA	en
dc.contributor.author	Iatrou, CT	en
dc.contributor.author	Vomvoridis, JL	en
dc.date.accessioned	2014-03-01T01:20:07Z
dc.date.available	2014-03-01T01:20:07Z
dc.date.issued	2004	en
dc.identifier.issn	0093-3813	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/15846
dc.subject	coaxial resonators	en
dc.subject	corrugated insert	en
dc.subject	gyrotrons	en
dc.subject	second harmonic	en
dc.subject	submillimeter-wave oscillators	en
dc.subject.classification	Physics, Fluids & Plasmas	en
dc.subject.other	Cavity resonators	en
dc.subject.other	Computer simulation	en
dc.subject.other	Continuous wave lasers	en
dc.subject.other	Electric conductivity	en
dc.subject.other	Electron cyclotron resonance	en
dc.subject.other	Electron velocity analyzers	en
dc.subject.other	Microwave generation	en
dc.subject.other	Microwave oscillators	en
dc.subject.other	Natural frequencies	en
dc.subject.other	Second harmonic generation	en
dc.subject.other	Submillimeter waves	en
dc.subject.other	Coaxial gyrotron cavities	en
dc.subject.other	Coaxial resonators	en
dc.subject.other	Corrugated inserts	en
dc.subject.other	Submillimeter wave oscillators	en
dc.subject.other	Gyrotrons	en
dc.title	Design considerations for powerful continuous-wave second-cyclotron-harmonic coaxial-cavity gyrotrons	en
heal.type	journalArticle	en
heal.identifier.primary	10.1109/TPS.2004.828781	en
heal.identifier.secondary	http://dx.doi.org/10.1109/TPS.2004.828781	en
heal.language	English	en
heal.publicationDate	2004	en
heal.abstract	The mode-selection ability of coaxial gyrotron cavities with a longitudinally corrugated inner conductor is systematically examined, as regards powerful, continuous-wave (CW) operation at the second harmonic of the electron-cyclotron frequency. Suitable cavity geometries for the excitation of a high-order mode of eigenvalue around 100 at the second harmonic have been identified, employing coaxial inserts both of high and of low conductivity. Focusing on submillimeter-wave radiation, we investigate frequency and CW limitations on efficiency, output power, and cavity machining and we present pertinent design considerations. The feasibility of powerful and efficient, CW, submillimeter-wave operation of coaxial cavities at the second harmonic is illustrated by two realistic designs of a second-harmonic gyrotron delivering a power over 100 kW CW at 340 GHz with electronic efficiency around 29%. The performance of the designs is confirmed by independent numerical simulations, which in addition show weak sensitivity to a spread in the electron velocity ratio. © 2004 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.2004.828781	en
dc.identifier.isi	ISI:000223186600013	en
dc.identifier.volume	32	en
dc.identifier.issue	3 I	en
dc.identifier.spage	917	en
dc.identifier.epage	928	en