{"title":"High-power te11 and tm11 circular polarizers in oversized waveguide at 70 ghz","authors":"M. Thumm, H. Kumrić","doi":"10.1109/IRMM.1987.9127056","DOIUrl":null,"url":null,"abstract":"Elliptic deformation of oversized, smooth-wall circular waveguide can produce arbitrary elliptical or circular polarization from a linearly polarized TE11 or TM11 mode, used as intermediates between TE01 and HE11 in electron cyclotron heating (ECH) of magnetically confined thermonuclear fusion plasmas with high-power gyrotrons. Mode coupling in overmoded elliptically distorted circular waveguide has been studied theoretically and experimentally in order to optimize TE11 (and TM11) polarizers (I.D. = 27.79 mm) for use in the 1 MW/70 GHz ECH system on the Garching Stellarator W VII-AS. Accurate differential phase characteristics and very low levels of spurious modes have been achieved.","PeriodicalId":399243,"journal":{"name":"1987 Twelth International Conference on Infrared and Millimeter Waves","volume":"1 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1987-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"4","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"1987 Twelth International Conference on Infrared and Millimeter Waves","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/IRMM.1987.9127056","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 4
Abstract
Elliptic deformation of oversized, smooth-wall circular waveguide can produce arbitrary elliptical or circular polarization from a linearly polarized TE11 or TM11 mode, used as intermediates between TE01 and HE11 in electron cyclotron heating (ECH) of magnetically confined thermonuclear fusion plasmas with high-power gyrotrons. Mode coupling in overmoded elliptically distorted circular waveguide has been studied theoretically and experimentally in order to optimize TE11 (and TM11) polarizers (I.D. = 27.79 mm) for use in the 1 MW/70 GHz ECH system on the Garching Stellarator W VII-AS. Accurate differential phase characteristics and very low levels of spurious modes have been achieved.
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