Design of Q-band FMCW reflectometry for electron density profile measurement on the Joint TEXT tokamak

Linghan Wan(Huazhong University of Science and Technology), Zhoujun Yang(Huazhong University of Science and Technology), Ruobing Zhou(Huazhong University of Science and Technology), Xiaoming Pan(Huazhong University of Science and Technology), Chi Zhang(Huazhong University of Science and Technology), Xianli Xie(Huazhong University of Science and Technology), Bowen Ruan(Huazhong University of Science and Technology)
Plasma Science and Technology
January 19, 2017
10.1088/2058-6272/19/2/025602
Cited by 10

Abstract

The Q-band (33–50 GHz) fast sweep frequency modulated continuous wave (FMCW) reflectometry has been recently developed for electron density profile measurement on the Joint TEXT tokamak. It operates in ordinary mode (O-mode) with a 20 μs sweeping period, covering the density range from 1 × 1019 m−3 to 3 × 1019 m−3. On the bench test, a Yttrium Iron Garnet (YIG) filter is used for the dynamic calibration of the voltage controlled oscillator (VCO) to obtain a linear frequency sweep. Besides, the use of a power combiner helps to improve the side-band suppression level of the single side-band modulator (SSBM). The reconstructed density profiles are presented, which demonstrate the capability of the reflectometry.

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