Lee D J, Lee W, Park H K, Kim T G
Department of Physics, Ulsan National Institute of Science and Technology, Ulsan 44919, South Korea.
National Fusion Research Institute, Daejeon 34133, South Korea.
Rev Sci Instrum. 2019 Jan;90(1):014703. doi: 10.1063/1.5066611.
A large-aperture beam splitter has been developed for simultaneous operation of two millimeter-wave diagnostics employing different probe beams in the frequency and polarization, microwave imaging reflectometer (∼85 GHz X-mode), and collective scattering system (300 GHz O-mode), on the Korea Superconducting Tokamak Advanced Research device. The beam splitter was designed based on a polarizer concept (i.e., grid of metal strips on a thin dielectric sheet), and this can be an optimal solution for these two diagnostics. Fabrication of the strips with uniform sub-millimeter width and spacing on a large dielectric sheet was achieved with an etching technique, and the laboratory test results on the reflection and transmission ratio are in good agreement with design values.
已开发出一种大孔径分束器，用于在韩国超导托卡马克先进研究装置上同时运行两种毫米波诊断设备，这两种设备在频率和极化方面采用不同的探测光束，即微波成像反射计（约85GHz X模）和集体散射系统（300GHz O模）。该分束器基于偏振器概念（即在薄介电片上的金属条网格）进行设计，这对于这两种诊断设备而言可能是最佳解决方案。通过蚀刻技术在大介电片上制作出具有均匀亚毫米宽度和间距的金属条，并且反射和透射率的实验室测试结果与设计值高度吻合。
