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Proceedings Paper

Generation of rotating high-order TEm,n modes for cold-test measurements on high-power quasl-optical gyrotron output mode converters
Author(s): M. Thumm
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Paper Abstract

This paper reports about numerical optimization calculations on mode converters to generate high-order TEm,n modes (TE22.2 at 110 GHz, TE12,2 at 120 GHz, TE15,2 and TE10,4 at 140 GHz) in oversized circular waveguides for conversion efficiency optimization studies (cold-tests) on high-power quasi-optical gyrotron output mode transducing antennas in the millimeter wave range. Multistep TE0.1 - to - TE0.n - to - TEm,n conversion sequences using periodic radius and m-fold (corksrew-type) wall perturbations provide theoretical output mode purities around 99 % . Measured values are (97 ± 3) %.

Paper Details

Date Published: 1 December 1990
PDF: 3 pages
Proc. SPIE 1514, 15th International Conference on Infrared and Millimeter Waves, 151419 (1 December 1990); doi: 10.1117/12.2301455
Show Author Affiliations
M. Thumm, Univ. Stuttgart (Germany)

Published in SPIE Proceedings Vol. 1514:
15th International Conference on Infrared and Millimeter Waves
Richard J. Temkin, Editor(s)

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