Design and manufacturing process for the KIT 2-MW 170-GHz coaxial-cavity longer-pulse gyrotron S. Ruess, G. Gantenbein, A. Heinzel, S. Illy, I. Gr. Pagonakis, T. Rzesnicki, M. Thumm, J. Weggen, A. Weisenburger and J. Jelonnek EPJ Web Conf., 149 (2017) 04015 Published online: 04 August 2017 DOI: 10.1051/epjconf/201714904015