Line identification of extreme ultraviolet (EUV) spectra from low-Z impurity ions in EAST tokamak plasmas

Lei LI (黎嫘); Ling ZHANG (张凌); Zong XU (许棕); Shigeru MORITA; Yunxin CHENG (程云鑫); Fengling ZHANG (张丰玲); Wenmin ZHANG (张文敏); Yanmin DUAN (段艳敏); Qing ZANG (臧庆); Shouxin WANG (王守信); Shuyu DAI (戴舒宇); Guizhong ZUO (左桂忠); Zhen SUN (孙震); Liang WANG (王亮); Xiaobin DING (丁晓彬); Jinping QIAN (钱金平); Haiqing LIU (刘海庆); Liqun HU (胡立群)

doi:10.1088/2058-6272/abfea2

Plasma Science and Technology > 2021 > 23(7): 75102-075102. > DOI: 10.1088/2058-6272/abfea2

Lei LI (黎嫘), Ling ZHANG (张凌), Zong XU (许棕), Shigeru MORITA, Yunxin CHENG (程云鑫), Fengling ZHANG (张丰玲), Wenmin ZHANG (张文敏), Yanmin DUAN (段艳敏), Qing ZANG (臧庆), Shouxin WANG (王守信), Shuyu DAI (戴舒宇), Guizhong ZUO (左桂忠), Zhen SUN (孙震), Liang WANG (王亮), Xiaobin DING (丁晓彬), Jinping QIAN (钱金平), Haiqing LIU (刘海庆), Liqun HU (胡立群). Line identification of extreme ultraviolet (EUV) spectra from low-Z impurity ions in EAST tokamak plasmas[J]. Plasma Science and Technology, 2021, 23(7): 75102-075102. DOI: 10.1088/2058-6272/abfea2

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Line identification of extreme ultraviolet (EUV) spectra from low-Z impurity ions in EAST tokamak plasmas

¹ Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
² University of Science and Technology of China, Hefei 230026, People's Republic of China
³ Advanced Energy Research Center, Shenzhen University, Shenzhen 518060, People's Republic of China
⁴ Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, People's Republic of China
⁵ National Institute for Fusion Science, Toki 509-5292, Gifu, Japan
⁶ Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Physics, Dalian University of Technology, Dalian 116024, People's Republic of China
⁷ Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, People's Republic of China

Funds: This work is supported by National Key Research and Development Program of China (Nos. 2018YFE0311100, 2017YFE0300402, 2017YFE0301300), National Natural Science Foundation of China (Nos. Nos. 11905146, 11775269, U1832126, 11805133), Hefei Science Center High-end User Development Fund Project (2019HSC-UE014) and Chinese Academy of Sciences President's International Fellowship Initiative (PIFI) (2020VMA0001)

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Received Date: March 25, 2021
Revised Date: April 29, 2021
Accepted Date: May 05, 2021

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Abstract

Abstract

Extreme ultraviolet (EUV) spectra emitted from low-Z impurity ions in the wavelength range of 10–500 Å were observed in Experimental Advanced Superconducting Tokamak (EAST) discharges. Several spectral lines from K- and L-shell partially ionized ions were successfully observed with sufficient spectral intensities and resolutions for helium, lithium, boron, carbon, oxygen, neon, silicon and argon using two fast-time-response EUV spectrometers of which the spectral intensities are absolutely calibrated based on the intensity comparison method between visible and EUV bremsstrahlung continua. The wavelength is carefully calibrated using well-known spectra. The lithium, boron and silicon are individually introduced for the wall coating of the EAST vacuum vessel to suppress mainly the hydrogen and oxygen influxes from the vacuum wall, while the carbon and oxygen intrinsically exist in the plasma. The helium is frequently used as the working gas as well as the deuterium. The neon and argon are also often used for the radiation cooling of edge plasma to reduce the heat flux onto the divertor plate. The measured spectra were analyzed mainly based on the database of National Institute of Standards and Technology. As a result, spectral lines of He II, Li II–III, B IV–V, C III–VI, O III–VIII, Ne II–X, Si V–XII, and Ar X–XVI are identified in EAST plasmas of which the central electron temperature and chord-averaged electron density range in T_e0 = 0.6–2.8 keV and n_e = (0.5–6.0) × 10¹⁹ m⁻³, respectively. The wavelengths and transitions of EUV lines identified here are summarized and listed in a table for each impurity species as the database for EUV spectroscopy using fusion plasmas.
- line identification,
- EUV spectroscopy,
- EUV spectra,
- impurity line emissions,
- tokamak plasmas

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References (26)

References

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