Feng X, Liu A D, Zhou C, Wang M Y, Zhang J, Liu Z Y, Liu Y, Zhou T F, Zhang S B, Kong D F, Hu L Q, Ji J X, Fan H R, Li H, Lan T, Xie J L, Mao W Z, Liu Z X, Ding W X, Zhuang G, Liu W D
KTX Laboratory and Department of Engineering and Applied Physics, University of Science and Technology of China, Anhui, Hefei 230026, China.
Institute of Plasma Physics, Chinese Academy of Sciences, Anhui, Hefei 230031, China.
Rev Sci Instrum. 2019 Feb;90(2):024704. doi: 10.1063/1.5075615.
A 5-channel Doppler backscattering system has been designed and installed in the Experimental Advanced Superconducting Tokamak (EAST). Through an I/Q-type double sideband modulator and a frequency multiplier, an array of finely spaced (Δf = 400 MHz) frequencies that span 1.6 GHz has been created. The center of the array bandwidth is tunable within the range of 75-97.8 GHz, which covers most of the W band (75-110 GHz). The incident angle can be adjusted from -4° to 12°, and the wavenumber range is 4-15 cm with a wavenumber resolution of Δk/k ≤ 0.35. Ray tracing is used to calculate the scattering location and the scattering wavenumber. This article details the hardware design, the ray tracing, and the preliminary experimental results from EAST plasmas.
一个5通道多普勒背向散射系统已被设计并安装在先进超导托卡马克实验装置（EAST）中。通过一个I/Q型双边带调制器和一个倍频器，创建了一个频率间隔精细（Δf = 400 MHz）、跨度为1.6 GHz的频率阵列。该阵列带宽的中心频率可在75 - 97.8 GHz范围内调谐，覆盖了大部分W波段（75 - 110 GHz）。入射角可在 - 4°至12°之间调节，波数范围为4 - 15 cm，波数分辨率为Δk/k ≤ 0.35。利用射线追踪来计算散射位置和散射波数。本文详细介绍了硬件设计、射线追踪以及EAST等离子体的初步实验结果。
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