NDLI: Experimental study of 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	1994
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/ mode at 110 GHz to a Gaussian beam in free space. The converter consists of a rippled-wall waveguide launcher and two toroidal focussing reflectors. A full vector diffraction theory was developed to simulate the converter operation and predict the characteristics of the output beam. The simulation results were used to modify and improve the reflector design. The converter was built and tested on a 3 /spl mu/sec pulsed gyrotron operating in the TE/sub 22, 6/ mode at 110 GHz. Beam expansion and calorimetric efficiency measurements agreed well with diffraction theory predictions. Greater than 95% of the TE/sub 22, 6/ power generated by the gyrotron was converted to a fundamental Gaussian beam and successfully coupled into a corrugated waveguide. Four additional reflectors were built to transform the fundamental Gaussian beam into two similar Gaussian-like beams of approximately equal power level. The vector diffraction theory analysis suggested that simple sinusoidal and toroidal shaping mirrors can achieve high efficiency beam splitting. Experiments showed that the beam splitting mirror relay successfully converted the fundamental Gaussian beam, produced by the launcher and two mirror relay, to two Gaussian-like beams. Calorimetric measurements indicated that 94% of the power leaving the gyrotron was converted to the dual beam output with 52% of the power in the upper beam and 42% in the lower beam. The measured beam patterns and expansions were in good agreement with predictions of vector diffraction theory.<>
Starting Page	259
Ending Page	262
File Size	321166
Page Count	4
File Format	PDF
ISBN	0780321111
ISSN	01631918
DOI	10.1109/IEDM.1994.383417
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1994-12-11
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Diffraction Tellurium Gyrotrons Mirrors Relays Predictive models Testing Power generation Optical coupling Gaussian approximation
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Electronic, Optical and Magnetic Materials Condensed Matter Physics Electrical and Electronic Engineering

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