From W7-X Towards ITER and Beyond: 2019 Status on EU Fusion Gyrotron Developments - Jelonnek, J.; Aiello, G.; Albaiar, F.; Alberti, S.; Avramidis, K. A.; Bertinetti, A.; Brucker, P.T.; Bruschi, A.; Chclis, I.; Dubray, J.; Fanale, F.; Fasel, D.; et al. (2019 International Vacuum Electronics Conference, IVEC 2019, 2019)