Progress on the development of the EU-1 MW gyrotron for ITER - Illy, S.; Avramidis, K.; Gantenbein, G.; Hesch, K.; Jelonnek, J.; Jin, J.; Pagonakis, I; Piosczyk, B.; Rzesnicki, T.; Thumm, M.; Alberti, S.; Hogge, J-P; et al. (ICOPS/BEAMS 2014 - 41st IEEE International Conference on Plasma Science and the 20th International Conference on High-Power Particle Beams, 2015)