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

Linghan WAN (万凌寒); Zhoujun YANG (杨州军); Ruobing ZHOU (周若冰); Xiaoming PAN (潘晓明); Chi ZHANG (张弛); Xianli XIE (谢先立); Bowen RUAN (阮博文)

doi:10.1088/2058-6272/19/2/025602

Plasma Science and Technology > 2017 > 19(2): 25602-025602. > DOI: 10.1088/2058-6272/19/2/025602

Linghan WAN (万凌寒), Zhoujun YANG (杨州军), Ruobing ZHOU (周若冰), Xiaoming PAN (潘晓明), Chi ZHANG (张弛), Xianli XIE (谢先立), Bowen RUAN (阮博文). Design of Q-band FMCW reflectometry for electron density profile measurement on the Joint TEXT tokamak[J]. Plasma Science and Technology, 2017, 19(2): 25602-025602. DOI: 10.1088/2058-6272/19/2/025602

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

State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, People’s Republic of China

Funds: This work is supported by the National Magnetic Confinement Fusion Energy Research Project (No.2014GB108001 and No.2015GB120003) and Fundamental Research Funds for the Central Universities of China, Huazhong University of Science and Technology (Grant No. 2015TS010).

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Received Date: May 17, 2016

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Abstract

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 1×10¹⁹m⁻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 sideband suppression level of the single side-band modulator (SSBM). The reconstructed density profiles are presented, which demonstrate the capability of the refiectometry.
- reflectometry,
- density,
- plasma,
- diagnostics

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References (13)

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