1. Department of Electrical, Electronic and Information Engineering, Università di Bologna, Bologna, Italy
2. ITER Organization, Route de Vinon-sur-Verdon, Saint-Paul-lez-Durance, Cedex, France
3. NEMO Group, Dipartimento Energia, Politecnico di Torino, Torino, Italy
4. Lawrence Livermore National Laboratory, Livermore, CA, USA
5. General Atomics, San Diego, CA, USA