1. ITER Organization, Route de Vinon-sur-Verdon, CS 90 046, St. Paul-lez-Durance Cedex 13067, France
2. KBC Advanced Technologies Ltd., 42-50 Hersham Road, Walton-on-Thames, Surrey KT12 1RZ, United Kingdom
3. Chinese Academy of Sciences, Institute of Plasma Physics, Shushanhu 350, Hefei 230031, China
4. University of Pisa, Civil and Industrial Engineering Department, Largo Lucio Lazzarino 2, Pisa 56126, Italy