M. Fukunari, Taisei Ozura, Masato Watanabe, Y. Yamaguchi, Y. Tatematsu, T. Saito, M. M. Melnikova, A. Rozhnev, N. Ryskin
{"title":"Frequency Measurements of a Complex-Cavity Gyrotron for 400 GHz Second-Harmonic Oscillation","authors":"M. Fukunari, Taisei Ozura, Masato Watanabe, Y. Yamaguchi, Y. Tatematsu, T. Saito, M. M. Melnikova, A. Rozhnev, N. Ryskin","doi":"10.1109/IRMMW-THz46771.2020.9370438","DOIUrl":null,"url":null,"abstract":"A complex cavity was fabricated to improve the mode selection property of a gyrotron for the 400 GHz second-harmonic oscillation. A combination of the TE8,3and the TE8,5modes was selected to provide resonant coupling. In the experiment, many fundamental and several second-harmonic modes oscillated independently in either the first or the second cavity. However, no fundamental oscillation was observed in the operation magnetic field region of the TE8,3/TE8,5 mode. The fabrication error of the cavity radii was successfully controlled to be smaller than 1 $\\mu\\mathrm{m}$. The oscillation of the design mode was observed by the frequency measurements. However, a mode competition with the TE3,5 mode occurred.","PeriodicalId":6746,"journal":{"name":"2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"26 1","pages":"1-2"},"PeriodicalIF":0.0000,"publicationDate":"2020-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/IRMMW-THz46771.2020.9370438","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
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Abstract
A complex cavity was fabricated to improve the mode selection property of a gyrotron for the 400 GHz second-harmonic oscillation. A combination of the TE8,3and the TE8,5modes was selected to provide resonant coupling. In the experiment, many fundamental and several second-harmonic modes oscillated independently in either the first or the second cavity. However, no fundamental oscillation was observed in the operation magnetic field region of the TE8,3/TE8,5 mode. The fabrication error of the cavity radii was successfully controlled to be smaller than 1 $\mu\mathrm{m}$. The oscillation of the design mode was observed by the frequency measurements. However, a mode competition with the TE3,5 mode occurred.
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