Ioannidis, Z.C. Avramidis, K.A. Rzesnicki, T. Chelis, I. Gantenbein, G. Illy, S. Jin, J. Pagonakis, I.G. Thumm, M. Jelonnek, J., Generation of 1.5 MW-140 GHz Pulses with the Modular Pre-Prototype Gyrotron for W7-X, IEEE Electron Device Letters, (42), 939-942, 2021, Institute of Electrical and Electronics Engineers, Inc. (IEEE), 0741-3106, 1558-0563