Journal
PLASMA SCIENCE & TECHNOLOGY
Volume 22, Issue 8, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2058-6272/ab81a4
Keywords
EAST tokamak; impurity tungsten; vacuum ultraviolet spectroscopy; edge impurity emission; plasma diagnostics
Categories
Funding
- National Magnetic Confinement Fusion Science Program of China [2017YFE0301300, 2018YFE0301100]
- National Natural Science Foundation of China [11805231, 11705151]
- ASIPP Science and Research Grant [DSJJ-17-03]
- Key Program of Research and Development of Hefei Science Center [2017HSC-KPRD002]
- Anhui Provincial Natural Science Foundation [1808085QA14, 1908085J01]
- Instrument Developing Project of the Chinese Academy of Sciences [YJKYYQ20180013]
- Collaborative Innovation Program of Hefei Science Center, CAS [2019HSC-CIP005]
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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 lambda = 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 5 ms 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 134.5 nm and CIII at 97.7 nm 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.
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