PT Unknown AU Ioannidis, ZC Rzesnicki, T Avramidis, KA Gantenbein, G Illy, S Jin, J Krier, L Pagonakis, IG Ruess, S Schmid, M Thumm, M Jelonnek, J TI Operation of the Modular KIT 170 GHz - 2 MW Longer-Pulse Coaxial-Cavity Gyrotron with Pulses up to 50 ms PY 2020 LA english ER