Recent activities of ITER gyrotron development in QST Y. Oda, R. Ikeda, K. Takahashi, K. Kajiwara, T. Kobayashi, K. Sakamoto, S. Moriyama, C. Darbos and M. Henderson EPJ Web Conf., 149 (2017) 01002 Published online: 04 August 2017 DOI: 10.1051/epjconf/201714901002