期刊
NUCLEAR MATERIALS AND ENERGY
卷 31, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nme.2022.101174
关键词
Laser-induced breakdown spectroscopy; Plasma-wall interaction; Boron deposition; Tungsten divertor; KSTAR
资金
- National Key R&D Program of China [2017YFE0301304, 2017YFA0402502, 2017YFA0402501]
- National Natural Science Foundation of China [12005034, 51837008, 11861131010]
- Fundamental Research Funds for the Central Universities of China [DUT21TD102, DUT20LK14]
- Ministry of Science and Information and Communication Technologies (ICT) under the Korea Institute of Fusion Energy (KFE) Research and Development Program of the KSTAR Experimental Collaboration and Fusion Plasma Research [EN1402, NFRI-PG1314]
- National Research Council of Science & Technology (NST), Republic of Korea [EN1402] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Boronization is essential for the high performance operation of tokamaks like KSTAR and ITER. Using LIBS diagnostic method, this study investigated boron impurity deposition on tungsten tiles in KSTAR, proposing a subtraction method to measure boron deposition accurately. The study also analyzed depth profiles of impurity elements and lateral distribution of boron and carbon, providing valuable insights into the plasma-wall interaction process in KSTAR.
Boronization is an important wall conditioning procedure for realizing the steady-state high performance operation of tokamaks such as KSTAR and ITER. The measurement of boron and its distribution on the first wall and divertor has a significant impact on studying the plasma-wall interaction (PWI) such as impurity generation, transportation and deposition behaviors. In this study, the laser-induced breakdown spectroscopic (LIBS) diagnostic method was applied in the lab for investigating the boron impurity deposited on the surface of different shaped tungsten (W) castellated tiles which were removed from the divertor region in the Korea Superconducting Tokamak Advanced Research (KSTAR). Meanwhile, other various impurity elements comprising carbon, silicon, calcium and copper were also observed. A subtraction method is proposed to eliminate the W line contribution for B deposition measurement. The depth profile of the impurity elements in the deposited layer also has been studied by the variation of spectral intensity with consecutive laser pulses. The lateral-distribution of the boron and carbon on the three tungsten castellated tiles (Rounded, Chamfered and Double chamfered) were carried out at 10(-5) mbar vacuum condition. The distribution features of the impurities on the three different shaped tungsten tiles provide valuable information to understand PWI process in KSTAR. This study demonstrates that LIBS is a potential diagnostic approach for monitoring the impurity deposition in tokamak such as KSTAR or ITER.
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