Jelonnek, J., Aiello, G., Avramidis, K., Gantenbein, G., Grossetti, G., Illy, S., et al. (2017). Developments of Fusion Gyrotrons for W7-X, ITER and EU DEMO: Ongoing Activities and Future Plans of KIT. Talk presented at 42nd International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz 2017). Cancun. 2017-08-27 - 2017-09-01.