1. Department of Electrical, Electronic and Information Engineering “Guglielmo Marconi” - DEI, University of Bologna, Bologna, Italy
2. MAHTEP Group, Dipartimento Energia “Galileo Ferraris”, Politecnico di Torino, Corso Duca degli Abruzzi, Torino, Italy
3. FSN-TECFIS- MNF Division, FOS laboratory, ENEA, Frascati, Italy
4. Superconductivity Section, FSN Department, ENEA, Frascati, Italy
5. Eni S.p.A., Piazzale Enrico Mattei, Rome, Italy