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Updated: Jan 28, 2026

Fabrication and Characterization of Superconducting Resonators
Published on: May 21, 2016
Five-channel tunable W-band Doppler backscattering system in the experimental advanced superconducting tokamak
1KTX Laboratory and Department of Engineering and Applied Physics, University of Science and Technology of China, Anhui, Hefei 230026, China.
Abstract:
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-1 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.
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