Development Of a high power wideband polarizer for electron cyclotron current drive system in JT-60SA

作者：Saigusa Mikio^*; Oyama Gaku; Matsubara Fumiaki; Takii Keita; Sai Takuma; Kobayashi Takayuki; Moriyama Shinichi

来源：Fusion Engineering and Design, 2015, 96-97: 577-582.

DOI：10.1016/j.fusengdes.2015.04.013

• Wideband
• Polarizer
• Dual frequency gyrotron
• Millimeter wave

A wideband polarizer consisting of a polarization twister and a circular polarizer has been developed for an electron cyclotron current driving system in JT-60SA, where the output frequencies of a dual frequency gyrotron for JT-60SA are 110 and 138 GHz. The groove depths are optimized for the dual frequencies by numerical simulations using a FDTD method and cold test results. The polarization properties of a mock-up polarizer are measured at the dual frequencies in cold tests. The cold test results suggest that all practical polarizations for ECCD experiments can be achieved at the dual frequencies. The prototype polarization twister has been tested up to 0.25 MW during 3s at the frequency of 110 GHz.

• 出版日期2015-10