1. Institute of Plasma Physics, CAS, Hefei, China
2. Swiss Plasma Center, École Polytechnique Fédérale de Lausanne, Geneva, Switzerland
3. Energy, Materials and Systems, Faculty of Science and Technology, University of Twente, Enschede, The Netherlands
4. University of Sciences and Technology of China, Hefei, China
5. TE Department, CERN, Geneva, Switzerland