1. ENEA, Fusion and Nuclear Safety Department, C. R. Frascati, Via E. Fermi 45, 00044 Frascati (Roma), Italy
2. National Institute for Nuclear Physics, Rome Department, P.le A. Moro 5, 00185 Roma, Italy
3. Consorzio RFX, Corso Stati Uniti 4, 35127 Padova, Italy
4. Institute for Fusion Theory and Simulation and Department of Physics, Zhejiang University, Hangzhou 310027, China