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Long-time measurements of line-integrated plasma electron density using a two-color homodyne optical fiber interferometer. 2021
Tao Lan, and
Sen Zhang, and
Weixing Ding, and
Ge Zhuang, and
Zhengwei Wu, and
Wenzhe Mao, and
Chen Chen, and
Shijie Lan, and
Hangqi Xu, and
Tijian Deng, and
Junfeng Zhu, and
Jiaren Wu, and
Yiming Zu, and
Defeng Kong, and
Shoubiao Zhang, and
Yuan Yao, and
Peng Yuan, and
Zian Wei, and
Haiyang Zhou, and
Hai Wang, and
Xiaohui Wen, and
Jie Wu, and
Chu Zhou, and
Ahdi Liu, and
Jinlin Xie, and
Hong Li, and
Chijin Xiao, and
Wandong Liu
Department of Plasma Physics and Fusion Engineering, University of Science and Technology of China, Hefei 230026, China.
A two-color homodyne Mach-Zehnder (M-Z) optical fiber interferometer with wavelengths of 1.55 and 1.31 µm was developed for long-time measurement of line-integrated plasma electron density. A novel phase difference demodulation algorithm based on a single 3 × 3 optical coupler was implemented in a two-color optical fiber interferometer scheme for the first time. Our laboratory tests showed that this new optical fiber interferometer could determine the phase shift due to the low-frequency ambient vibration and could maintain high phase resolution measurement. The resolution of the new interferometer was less than 0.04 rad in 1000 s, corresponding to a line-averaged electron density of less than 1.0 × 1019 m-2. Actual plasma discharge experiments performed on KTX-CTI, which is a new compact torus injector (CTI) constructed at the Keda Torus eXperiment (KTX), showed that this interferometer has excellent several-second stability.
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