Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Two-dimensional measurements of the ELM filament using a multi-channel electrical probe array with high time resolution at the far SOL region in the KSTAR

  • Hong, Young-Hun (Department of Electrical Engineering, Hanyang University) ;
  • Kim, Kwan-Yong (Department of Electrical Engineering, Hanyang University) ;
  • Kim, Ju-Ho (Department of Electrical Engineering, Hanyang University) ;
  • Son, Soo-Hyun (Korea Institute of Fusion Energy (KFE)) ;
  • Lee, Hyung-Ho (Korea Institute of Fusion Energy (KFE)) ;
  • Eo, Hyun-Dong (Department of Electrical Engineering, Hanyang University) ;
  • Kim, Min-Seok (Department of Electrical Engineering, Hanyang University) ;
  • Hong, Suk-Ho (Korea Institute of Fusion Energy (KFE)) ;
  • Chung, Chin-Wook (Department of Electrical Engineering, Hanyang University)
  • Received : 2021.10.29
  • Accepted : 2022.05.02
  • Published : 2022.10.25
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Abstract

For the first time, two-dimensional temporal behavior of the edge localized mode (ELM) filament is measured in the edge tokamak plasma with a multi-channel electrical probe array (MCEP). MCEP, which has 16 floating probes (4 × 4), is mounted at the far scrape-off layer (SOL) region in the KSTAR. An electron temperature and an ion flux are measured by sideband method (SBM), which can achieve two-dimensional measurements with high time resolution. Furthermore, temporal evolutions of the electron temperature and the ion flux are obtained during the ELM occurrence. In the H-mode period, short spikes from ELM bursts are observed in measured plasma parameters, and the trend is similar to that of typical Hα signal. Interestingly, when blob-like ELM filaments crash the probe, the heat flux is significantly higher in a local region of the probe array. The results show that our probe array using the SBM can measure the ELM behavior and the plasma parameters without the effect of the stray current caused by the huge device. This study can provide valuable data needed to understand the interaction between the SOL plasma and the plasma facing components (PFCs).

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea (NRF-2019M1A7A1A03087579, NRF-2021R1I1A 1A01050312), the Ministry of Trade, Industry and Energy (20011226, 20009415, 20010412, 20012609).

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