Effective cavity length of high-power gyrotrons

Author

Thumm, Manfred

Author_Institution

IHM, Karlsruhe Inst. of Technol. (KIT), Karlsruhe, Germany

fYear

2014

fDate

14-19 Sept. 2014

Firstpage

1

Lastpage

2

Abstract

The effective cavity length of megawatt-class gyrotrons for thermonuclear fusion plasma heating with cavity quality factors in the range of 1000 to 2000 cannot be deduced just from the cavity field profile, since this has by far not a Gaussian contour. This report presents a novel method to determine the effective length of a high-power gyrotron cavity from the eigenvalue of the operating mode, the cavity radius and the exact oscillation frequency, computed from self-consistent multimode simulations, or measured. This effective cavity length then can be used to calculate the Fresnel parameter in order to confirm the possibility of single-mode operation.

Keywords

eigenvalues and eigenfunctions; gyrotrons; plasma heating; Fresnel parameter; cavity quality factors; cavity radius; effective cavity length; eigenvalue; high-power gyrotrons; megawatt-class gyrotrons; oscillation frequency; self-consistent multimode simulations; thermonuclear fusion plasma heating; Cavity resonators; Cutoff frequency; Diffraction; Frequency measurement; Gyrotrons; Oscillators; Q-factor;

fLanguage

English

Publisher

ieee

Conference_Titel

Infrared, Millimeter, and Terahertz waves (IRMMW-THz), 2014 39th International Conference on

Conference_Location

Tucson, AZ

Type

conf

DOI

10.1109/IRMMW-THz.2014.6956472

Filename

6956472