An extreme ultraviolet spectrometer working at 10-130 angstrom for tungsten spectra observation with high spectral resolution and fast-time response in Experimental Advanced Superconducting Tokamak
An extreme ultraviolet spectrometer working at 10-130 angstrom for tungsten spectra observation with high spectral resolution and fast-time response in Experimental Advanced Superconducting Tokamak
复制标题
工作在 10-130 埃的极紫外光谱仪，用于实验先进超导托卡马克中具有高光谱分辨率和快速响应的钨光谱观测
DOI：
10.1016/j.nima.2021.165545
复制
发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Liu Haiqing
中科院分区：
文献类型：
--
作者：
Xu Zong;Zhang Ling;Cheng Yunxin;Morita Shigeru;Li Lei;Zhang Wenmin;Zhang Fengling;Zhao Zihang;Zhou Tianfu;Wu Zhenwei;Lin Xiaodong;Gao Xiang;Ding Xiaobin;Yang Yang;Liu Haiqing
研制了一台工作在10-130 nm波长范围内的平场极紫外（EUV）谱仪，用于在实验先进超导托卡马克（EAST）装置上观测高电离态钨离子的谱线辐射。平场极紫外光谱仪采用了入射角为88.6°、中心线间距为2400条/mm的凹面全息光栅和像素数为1024× 255（26× 26 μ m2/pixel）的背照式电荷耦合器件（CCD）。CCD通常在全垂直面元（FVB）模式下以每帧5 ms操作。通过调整光栅和CCD的角度和位置，获得了Δ λ 0= 4-6个象素（谱线轮廓根部全宽）的高光谱分辨率，对应于20 μ m处0.1 μ m的半高宽。这样，在进行精确的波长标定后，就可以对复杂的钨光谱进行谱线识别。典型的钨光谱记录在低（Te = 1。0 keV）和高（Te = 2. 6 keV）电子温度。参考前人的实验结果和NIST数据库，初步确定了波长范围为15-35和45-65 nm的钨未分辨跃迁阵列（W-UTA）分别为W24 +-W33+和W27 +-W 45+离子的谱线发射.开发了一套分析计算程序，对EAST实验中的所有放电数据进行了基本的数据采集后，实现了对EUV光谱仪观测到的谱线的自动识别。
A newly developed flat-field extreme ultraviolet (EUV) spectrometer working at 10–130 Å wavelength range with high spectral resolution and fast-time response has been developed to observe line emissions from highly ionized tungsten ions in the Experimental Advanced Superconducting Tokamak (EAST). This flat-field EUV spectrometer is equipped with a laminar-type varied-line-spacing (VLS) concave holographic grating (2400 grooves/mm at grating center) fixed at an angle of incidence of 88.6°, and a back-illuminated charge-coupled device (CCD) with pixel numbers of 1024× 255 (26× 26 μ m 2/pixel). The CCD is routinely operated at 5 ms per frame with full vertical binning (FVB) mode. An excellently high spectral resolution of Δ λ 0= 4–6 pixels (full width at foot position of spectral line profile), which corresponds to full width of half maximum (FWHM) of 0.1 Å at 20 Å, has been obtained by carefully adjusting angles and positions of the grating and CCD. Thus, the line identification of complicated tungsten spectra became possible, when a precise wavelength calibration was done. Typical tungsten spectra are recorded at low (T e= 1. 0 keV) and high (T e= 2. 6 keV) electron temperatures. Tungsten unresolved transition arrays (W-UTA) existing at wavelength ranges of 15–35 and 45–65 Å were preliminarily identified as line emissions from W 24+–W 33+ and W 27+–W 45+ ions, respectively, by referring to previous experimental results and National Institute of Standards and Technology (NIST) database. Developing a set of analytical computer programs, line spectra observed with the EUV spectrometer have been automatically identified after data acquisition basically for all discharges during daily EAST experiment.