Step-frequency operation of a coaxial cavity gyrotron from 134 to 169.5 GHz

Author

Piosczyk, Bernhard ; Arnold, A. ; Dammertz, G. ; Kuntze, M. ; Michel, G. ; Lamba, O.S. ; Thumm, Manfred K.

Author_Institution

Inst. fur Hochleistungsimpuls- und Mikroellentechnik, Forschungszentrum Karlsruhe, Germany

Volume

28

Issue

3

fYear

2000

fDate

6/1/2000 12:00:00 AM

Firstpage

918

Lastpage

923

Abstract

Experiments on frequency step tuning have been performed in a coaxial cavity gyrotron equipped with a Brewster window. In single-mode operation, 19 different modes have been excited with high power In a frequency range between 134-169.5 GHz. In all modes, the radio frequency (RF) power was efficiently transmitted through the output window with only slightly varying RF power distribution. The step-frequency tuning is restricted by the coaxial insert. In particular, the strong increase of the quality factor for small values of the parameter w, which describes the corrugation impedance, limits the maximum frequency range. Furthermore, the increase of ohmic losses at the insert for modes with reduced caustic radius may restrict the selection of usable modes.

Keywords

Q-factor; gyrotrons; millimetre wave tubes; 134 to 169.5 GHz; Brewster window; RF power distribution; coaxial cavity gyrotron; coaxial insert; corrugation impedance; frequency step tuning; ohmic losses; quality factor; radio frequency power; single-mode operation; step-frequency operation; usable modes; Coaxial components; Gyrotrons; Impedance; Insertion loss; Magnetic fields; Magnetohydrodynamics; Power distribution; Radio frequency; Superconducting magnets; Tuning;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/27.887753

Filename

887753