Polarimeter-interferometer diagnostic using terahertz solid state sources for fluctuation measurements on Keda Torus eXperiment (KTX)
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Published:2023-11-16
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ISSN:1009-0630
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Container-title:Plasma Science and Technology
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language:
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Short-container-title:Plasma Sci. Technol.
Author:
Wang Xingkang,
Mao Wenzhe,
Xie Jinlin,
Lan TaoORCID,
Li Hong,
Liu Adi,
Zhou Chu,
Wen Xiaohui,
Wei Zian,
Wu Jie,
Chen ChenORCID,
Liu Dongkuan,
Rao Xianhao,
Cai Hu,
Wu Jiaren,
Deng Peng,
Liu Haiqing,
Ding Weixing,
Zhuang Ge,
Liu Wandong
Abstract
Abstract
A multi-channel polarimeter-interferometer has been developed on the Keda Torus eXperiment (KTX) for the study of equilibrium dynamics and internal magnetic fluctuations. Three-wave technique based on terahertz solid state sources (~650 GHz) is applied for simultaneous measurements of electron density and Faraday rotation angle. The output power of the microwave source is 2 mW. Faraday rotation effect using a rotating wave plate is tested with phase noise less than 0.8°, and the density phase noise is less than 0.9°. Measurement of Faraday rotation angle and density for discharges on KTX have demonstrated high sensitivity to internal MHD activities.
Funder
National Natural Science Foundation of China
Fundamental Research Funds for the Central Universities
Collaborative Innovation Program of Hefei Science Center, CAS
Subject
Condensed Matter Physics