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