Progress in the development of a 1-MW, CW gyrotron at 140 GHz for fusion plasma heating

The development of high power gyrotrons in continuous wave operation for heating of plasmas used in nuclear fusion research has been in progress for several years in a collaboration between different European research institutes and industrial partners. The 140 GHz gyrotron is designed for an output power of 1 MW in continuous wave operation and is operated in the TE28,8 mode. The first prototype type had been built with several modification with respect to the "Maquette".