Generation of rotating high-order Tem>n modes for cold-test measurements on high-power quasl-optical gyrotron output mode converters

M. Thumm

doi:10.1117/12.2301455

1 December 1990 Generation of rotating high-order TE_m,n modes for cold-test measurements on high-power quasl-optical gyrotron output mode converters

M. Thumm

Author Affiliations +

Proceedings Volume 1514, 15th International Conference on Infrared and Millimeter Waves; 151419 (1990) https://doi.org/10.1117/12.2301455
Event: 15th International Conference on Infrared and Millimeter Waves, 1990, Orlando, FL, United States

Abstract

This paper reports about numerical optimization calculations on mode converters to generate high-order TE_m,n modes (TE_22.2 at 110 GHz, TE_12,2 at 120 GHz, TE_15,2 and TE_10,4 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 TE_0.1 - to - TE_0.n - to - TE_m,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) %.

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M. Thumm "Generation of rotating high-order TE_m,n modes for cold-test measurements on high-power quasl-optical gyrotron output mode converters", Proc. SPIE 1514, 15th International Conference on Infrared and Millimeter Waves, 151419 (1 December 1990); https://doi.org/10.1117/12.2301455

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