1. Institute of Plasma Technology, Korea Institute of Fusion Energy (KFE) 1 , 37 Dongjangsan-ro, Gunsan, Jeollabuk-do 54004, South Korea
2. Department of Physics, Chungnam National University 2 , Daejeon 34134, South Korea
3. Institute of Physics, Astronomy and Applied Informatics, Nicolaus Copernicus University 3 , Grudziadzka 5, 87-100 Toruń, Poland
4. Department of Physics, University of Central Florida 4 , Orlando, Florida 32816, USA
5. Department of Physics and Astronomy, University College London 5 , Gower Street, London WC1E 6BT, United Kingdom