| Citation: |
Huajian JI, Hongming ZHANG, Bo LYU, Cheonho BAE, Liang HE, Zichao LIN, Xianghui YIN, Yongcai SHEN, Shuyu DAI. Wavelength calibration and spectral analysis of vacuum ultraviolet spectroscopy in EAST[J]. Plasma Science and Technology, 2024, 26(8): 085105. DOI: 10.1088/2058-6272/ad4f24
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A vacuum ultraviolet (VUV) spectroscopy with a focal length of 1 m has been engineered specifically for observing edge impurity emissions in Experimental Advanced Superconducting Tokamak (EAST). In this study, wavelength calibration for the VUV spectroscopy is achieved utilizing a zinc lamp. The grating angle and charge-coupled device (CCD) position are carefully calibrated for different wavelength positions. The wavelength calibration of the VUV spectroscopy is crucial for improving the accuracy of impurity spectral data, and is required to identify more impurity spectral lines for impurity transport research. Impurity spectra of EAST plasmas have also been obtained in the wavelength range of 50–300 nm with relatively high spectral resolution. It is found that the impurity emissions in the edge region are still dominated by low-Z impurities, such as carbon, oxygen, and nitrogen, albeit with the application of full-tungsten divertors on the EAST tokamak.
The authors wish to thank the EAST team. The work was partially supported by National Natural Science Foundation of China (Nos. U23A2077, 12175278 and 12205072), the National Magnetic Confinement Fusion Science Program of China (Nos. 2019YFE0304002 and 2018YFE0303103), the Comprehensive Research Facility for Fusion Technology Program of China (No. 2018-000052-73-01-001228), Major Science and Technology Infrastructure Maintenance and Reconstruction Projects of the Chinese Academy of Sciences (2021), and the University Synergy Innovation Program of Anhui Province (No. GXXT2021-029).
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