| Citation: |
Junren MOU, Yonggao LI, Yuan LI, Zaihong WANG, Baogang DING, Haoxi WANG, Jiang YI, Zhongbing SHI. Electron density measurement by the three boundary channels of HCOOH laser interferometer on the HL-3 tokamak[J]. Plasma Science and Technology, 2024, 26(3): 034013. DOI: 10.1088/2058-6272/ad127a
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Far-infrared (FIR) interferometer is widely used to measure the electron density in the magnetically confined fusion plasma devices. A new FIR laser interferometer with a total of 13 channels (8 horizontal channels and 5 oblique channels) is under development on the HL-3 tokamak by using the formic-acid laser (HCOOH, f = 694 GHz). In order to investigate the boundary electron density activity during the divertor discharge, three horizontal interferometry channels located at Z = −97, −76, 76.5 cm have been successfully developed on HL-3 in 2023, and put into operation in recent experimental campaign, with a time resolution of < 1.0 μs and line-integrated electron density resolution of ~ 7.0 × 1016 m−2. This paper mainly focuses on the optical design of the three-channel interferometry system, as well as optical elements and recent experimental result on HL-3.
The corresponding author (Yonggao Li) would like to express sincere thanks to Dr. Yan Zhou, Zhongchao Deng, and Bihe Deng for their helpful suggestion on the diagnostic development, to the engineers Jin Wang, Wei Zhang, Ruijun Li, Linze Wu, Guohui Fu and Hong Xu for their help in the assembly work of the interferometry system. This work was supported by the National Magnetic Confinement Fusion Science Program of China (Nos. 2019YFE03020004, 2018YFE0304102 and 2019YFE03020002) and the Department of Science and Technology of Sichuan Province (No. 2020YJ0463).
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