NDLI: Quasi-optical mode converters for high order mode gyrotrons

Content Provider	IEEE Xplore Digital Library
Author	Blank, M. Kreischer, K.E. Temkin, R.J.
Copyright Year	1993
Description	Author affiliation: Plasma Fusion Center, MIT, Cambridge, MA, USA (Blank, M.; Kreischer, K.E.; Temkin, R.J.)
Abstract	A quasi-optical mode converter has been designed to transform the TE/sub 22,6/ cylindrical waveguide mode at 110 GHz to a Gaussian beam in free space. The converter consists of an irregular cylindrical waveguide section followed by a step-cut launching aperture and several focussing reflectors in an open mirror transmission line. The irregular waveguide section, which was designed with coupled mode theory, is used to bunch the radiation into Gaussian bundles prior to the launch. The reflectors that follow were designed with Gaussian optics and diffraction theory. A rigorous diffraction theory has been developed to analyse the converter system. The converter was built and a preliminary test on a MW power level pulsed gyrotron has been completed. A symmetric Gaussian beam output with the predicted beam waist of 0.9 cm was observed. Experimental results are compared to diffraction theory simulations and very good agreement is obtained.
Starting Page	1107
Ending Page	1110
File Size	290061
Page Count	4
File Format	PDF
ISBN	0780314123
DOI	10.1109/FUSION.1993.518517
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1993-10-11
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Gyrotrons Optical waveguides Optical waveguide theory Optical diffraction Tellurium Apertures Mirrors Power transmission lines Transmission line theory Couplings
Content Type	Text
Resource Type	Article

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