A space-resolved extreme ultraviolet spectrometer for radial profile measurement of tungsten ions in the Experimental Advanced Superconducting Tokamak
A space-resolved extreme ultraviolet spectrometer for radial profile measurement of tungsten ions in the Experimental Advanced Superconducting Tokamak
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用于实验先进超导托卡马克中钨离子径向剖面测量的空间分辨极紫外光谱仪
DOI：
10.1016/j.nima.2018.11.082
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Hu Liqun
中科院分区：
文献类型：
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作者：
Zhang Ling;Morita Shigeru;Wu Zhenwei;Xu Zong;Yang Xiuda;Cheng Yunxin;Zang Qing;Liu Haiqing;Liu Yong;Zhang Hongming;Ohishi Tetsutarou;Chen Yingjie;Xu Liqing;Wu Chengrui;Duan Yanmin;Gao Wei;Huang Juan;Gong Xianzu;Hu Liqun
为了研究长脉冲H模放电中钨离子的径向输运，我们研制了一台工作在30-520 μ m的空间分辨谱仪，测量了钨离子的线发射的径向分布。该谱仪安装在EAST托卡马克水平中板诊断端口的一根长真空管后。等离子体和光谱仪之间的长距离为8835.5 mm，可以在-8的宽垂直范围内观察杂质线发射的径向分布。5≤ Z≤ 40 cm（− 0. 1≤ ρ≤ 0。6）。在光谱线轮廓的底部位置处具有良好的光谱分辨率Δ λ 0= 4− 5像素，以及高空间分辨率Δ Z= 2。除了足够的时间分辨率（例如50 ms/帧）之外，还获得5cm的分辨率。结果，在EAST欧姆和H模式放电中成功获得了碳、氧、氩、铁和钨等多种杂质物种的准确径向分布。在45-70 nm和120-140 nm两个波长范围内测量了W 42+-W 45+离子4p-4s跃迁的钨谱线辐射，分析了钨谱线辐射的径向分布，并根据ADAS数据库中的光子发射率系数估算了离子密度。结果表明，在Te（0）= 3 keV，ne（0）= 4× 1013 cm− 3的稳态H模放电中，W 43+-W 45+离子的密度范围为2-6× 108 cm− 3。
In order to study the radial transport of tungsten ions in long-pulse H-mode discharges, a space-resolved spectrometer working at 30–520 Å has been newly developed to measure a radial profile of the tungsten line emission. The spectrometer is installed behind a long extension vacuum tube connected to a horizontal midplane diagnostic port of EAST tokamak. The long distance between the plasma and spectrometer, 8835.5 mm, enables observation of the radial profile of impurity line emissions in a wide vertical range of− 8. 5≤ Z≤ 40 cm (− 0. 1≤ ρ≤ 0. 6). A good spectral resolution of Δ λ 0= 4− 5 pixels at the foot position of spectral line profiles and a high spatial resolution of Δ Z= 2. 5 cm are obtained in addition to a sufficient temporal resolution, eg 50 ms/frame. As a result, accurate radial profiles have been successfully obtained in EAST Ohmic and H-mode discharges for several impurity species such as carbon, oxygen, argon, iron and tungsten. The radial profiles of tungsten line emissions from W 42+–W 45+ ions with 4p–4s transitions measured at two wavelength ranges of 45–70 Å and 120–140 Å are analyzed for the ion density evaluation based on the photon emissivity coefficient from ADAS database. The result shows that the density of W 43+–W 45+ ions ranges at 2–6× 10 8 cm− 3 in steady H-mode discharges with T e (0)= 3 keV and n e (0)= 4× 10 13 cm− 3.