AbstractEfficient transmission and polarization in 110 GHz transmission line for JT-60U was studied. A 40-m run transmission test line (inner diameter of 31.75 mm) with eight miter bends, which included a pair of polarizers was designed and constructed. The transmission at 1 MW was performed and the transmission efficiency of 89% (without mirror optical unit (MOU)) was obtained. In basis of the good result, a 1 MW, 110 GHz electron cyclotron range of frequency (ECRF) system was constructed in JT-60U. Transmissions of 1 MW-2.0 s and 0.32 MW-5.0 s were performed in JT-60U ECRF system. The polarization of the transmitted wave in the transmission line was measured and the dependence of plasma electron heating on polarization was investigated. The optimum elliptical polarization of the incidence wave for the ECRF experiments in JT-60U was calculated using the cold dispersion relation with the measured polarization. The optimum polarization was applied to the electron heating experiment of JT-60U.
JT-60U用110GHz伝送線路における効率的な伝送と偏波について研究した。8つのマイターベンドを含む40mの伝送試験線路（内径31.75mm）を設計・建設し、これには一対の偏波器が含まれた。1MWでの伝送を実施し、伝送効率89%（ミラー光学ユニット（MOU）なし）を得た。この良好な結果に基づき、JT-60Uに1MW、110GHzの電子サイクロトロン周波数帯（ECRF）システムを建設した。JT-60UのECRFシステムにおいて、1MW・2.0秒および0.32MW・5.0秒の伝送を実施した。伝送線路内の伝送波の偏波を測定し、偏波に対するプラズマ電子加熱の依存性を調査した。JT-60UのECRF実験における入射波の最適な楕円偏波を、測定された偏波を用いて低温分散関係から計算した。この最適偏波をJT-60Uの電子加熱実験に適用した。