1. Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), Jülich 52425, Germany
2. International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, People’s Republic of China
3. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China
4. Max-Planck-Institut für Plasmaphysik, Greifswald 17491, Germany