Progress of plasma density fluctuation measurements with phase contrast imaging on HL-2A tokamak
Progress of plasma density fluctuation measurements with phase contrast imaging on HL-2A tokamak
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HL-2A托卡马克相衬成像等离子体密度涨落测量研究进展
DOI：
10.1088/2058-6272/ab0054
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发表时间：
2019
影响因子：
1.7
通讯作者：
Duan Xuru
中科院分区：
文献类型：
--
作者：
Gong Shaobo;Yu Yi;Xu Min;Sun Aiping;Lan Tao;Nie Lin;Ke Rui;Long Ting;Liu Hao;Wu Yifan;Yuan Boda;Wang Huajie;Yuan Jinbang;Shi Zhongbing;Zhong Wulv;Mao Shifeng;Ye Minyou;Duan Xuru
在HL-2A装置上研制了一种基于CO2激光的相位衬度成像（PCI）诊断装置。它可以通过测量激光束被等离子体散射后的相移来探测线积分等离子体密度起伏。诊断的放射状区域范围为~ 0.7。32-通道HgCdTe探测器与交流偏置放大器在光路的成像平面上排成一行，该PCI能够诊断波数范围为2 ~ 15 cm-1的密度起伏，时间分辨率优于2 μs。HL-2A装置2018年春季运行获得了第一批实验数据。高性能在不同的放电配置中得到证实，并使其成为宽带湍流调查的一个敏锐的工具。
A CO2 laser-based phase contrast imaging (PCI) diagnostic has been developed on HL-2A tokamak. It can detect line integrated plasma density fluctuations by measuring the phase shift of laser beam after being scattered by the bulk plasma. The diagnosed radial region ranges from to 0.7. 32-channel HgCdTe detectors with alternative-current biased amplifiers are arranged in line at the imaging plane of the optical path. This PCI is able to diagnose density fluctuations with wavenumbers ranging from 2 to 15 cm−1 and the time resolution is better than 2 μs. The first experimental data were achieved in 2018 spring campaign of HL-2A tokamak. High performance is confirmed in different discharging configurations and makes it a keen tool in broadband turbulence investigations.