Recent Trends in Fusion Gyrotron Development at KIT G. Gantenbein, K. Avramidis, J. Franck, S. Illy, Z. C. Ioannidis, J. Jin, J. Jelonnek, P. Kalaria, I. Gr. Pagonakis, S. Ruess et al. (3 more) EPJ Web Conf., 157 (2017) 03017 Published online: 23 October 2017 DOI: 10.1051/epjconf/201715703017