Development of vacuum ultraviolet spectroscopy for measuring edge impurity emission in the EAST tokamak

Hongming ZHANG (张洪明); Bo LYU (吕波); Liang HE (何梁); Yongcai SHEN (沈永才); Jun CHEN (陈俊); Jia FU (符佳); Bin BIN (宾斌); Xunyu WANG (王勋禺); Fudi WANG (王福地); Yingying LI (李颖颖); Ling ZHANG (张凌); Bing LIU (刘兵)

doi:10.1088/2058-6272/ab81a4

Plasma Science and Technology > 2020 > 22(8): 84001-084001. > DOI: 10.1088/2058-6272/ab81a4

Hongming ZHANG (张洪明), Bo LYU (吕波), Liang HE (何梁), Yongcai SHEN (沈永才), Jun CHEN (陈俊), Jia FU (符佳), Bin BIN (宾斌), Xunyu WANG (王勋禺), Fudi WANG (王福地), Yingying LI (李颖颖), Ling ZHANG (张凌), Bing LIU (刘兵). Development of vacuum ultraviolet spectroscopy for measuring edge impurity emission in the EAST tokamak[J]. Plasma Science and Technology, 2020, 22(8): 84001-084001. DOI: 10.1088/2058-6272/ab81a4

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Development of vacuum ultraviolet spectroscopy for measuring edge impurity emission in the EAST tokamak

¹ Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
² School of Nuclear Science and Technology, University of South China, Hengyang 421001, People's Republic of China
³ School of Physics and Electrical Engineering, Anqing Normal University, Anqing 246011, People's Republic of China
⁴ Department of Engineering and Applied Physics, University of Science and Technology of China, Hefei 230026, People's Republic of China
⁵ Institute of Fusion Science, School of Physical Science and Technology, Southwestern Jiaotong University, Chengdu 610031, People's Republic of China

Funds: The work is partially supported by the National Magnetic Confinement Fusion Science Program of China (Nos. 2017YFE0301300 and 2018YFE0301100), National Natural Science Foundation of China (Nos. 11805231, 11705151), ASIPP Science and Research Grant (No. DSJJ-17-03), Key Program of Research and Development of Hefei Science Center (No. 2017HSC-KPRD002), Anhui Provincial Natural Sci- ence Foundation (Nos. 1808085QA14 and 1908085J01), Instrument Developing Project of the Chinese Academy of Sciences (No. YJKYYQ20180013) and Collaborative Innovation Program of Hefei Science Center, CAS (No. 2019HSC-CIP005).

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Received Date: January 06, 2020
Revised Date: March 15, 2020
Accepted Date: March 19, 2020

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Abstract

Abstract

The dominant wavelength range of edge impurity emissions moves from the visible range to the vacuum ultraviolet (VUV) range, as heating power increasing in the Experimental Advanced Superconducting Tokamak (EAST). The measurement provided by the existing visible spectroscopies in EAST is not sufficient for impurity transport studies for high-parameters plasmas. Therefore, in this study, a VUV spectroscopy is newly developed to measure edge impurity emissions in EAST. One Seya-Namioka VUV spectrometer (McPherson 234/302) is used in the system, equipped with a concave-corrected holographic grating with groove density of 600 grooves mm ^–1. Impurity line emissions can be observed in the wavelength range of λ=50–700 nm, covering VUV, near ultraviolet and visible ranges. The observed vertical range is Z=−350–350 mm. The minimum sampling time can be set to 5ms under full vertical binning (FVB) mode. VUV spectroscopy has been used to measure the edge impurity emission for the 2019 EAST experimental campaign. Impurity spectra are identified for several impurity species, i.e., lithium (Li), carbon (C), oxygen (O), and iron (Fe). Several candidates for tungsten (W) lines are also measured but their clear identification is very difficult due to a strong overlap with Fe lines. Time evolutions of impurity carbon emissions of CII at 134.5nm and CIII at 97.7nm are analyzed to prove the system capability of time-resolved measurement. The measurements of the VUV spectroscopy are very helpful for edge impurity transport study in the high-parameters plasma in EAST.
- EAST tokamak,
- impurity tungsten,
- vacuum ultraviolet spectroscopy,
- edge impurity emission,
- plasma diagnostics

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References (18)

References

[1]	Isler R C 1984 Nucl. Fusion 24 1599
[2]	Doyle E J et al 2007 Nucl. Fusion 47 S18
[3]	Wan B N et al 2017 Nucl. Fusion 57 102019
[4]	Vogel G et al 2018 IEEE Trans. Plasma Sci. 46 1350
[5]	Oishi T et al 2014 Rev. Sci. Instrum. 85 11E415
[6]	Oishi T et al 2015 Plasma Fusion Res. 10 3402031
[7]	Oishi T et al 2016 Phy. Scripta 91 025602
[8]	Mao H M et al 2017 Rev. Sci. Instrum. 88 043502
[9]	Shen Y C et al 2013 Nucl. Instrum. Methods Phys. Res. Sect. A 700 86
[10]	Shen Y C et al 2013 Fusion Eng. Des. 88 3072
[11]	Zhang L et al 2015 Rev. Sci. Instrum. 86 123509
[12]	Zhang L et al 2019 Nucl. Instrum. Methods Phys. Res. Sect. A 916 169
[13]	Field A R et al 1995 Rev. Sci. Instrum. 66 5433
[14]	Krawczyk N et al 2018 Rev. Sci. Instrum. 89 10D131
[15]	De Michelis C et al 2002 Plasma Phys. Control. Fusion 44 1393
[16]	Oishi T et al 2014 Appl. Opt. 53 6900
[17]	Namioka T 1959 J. Opt. Soc. Am. 49 951
[18]	Noda H et al 1974 J. Opt. Soc. Am. 64 1043

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