Development of frequency tunable, submillimeter wave gyrotron FU series

Summary form only given, as follows. High frequency, frequency tunable, medium power gyrotrons (Gyrotron FU series) are being developed at Fukui University as millimeter to submillimeter wave sources. The gyrotron series has achieved frequency tunability in a wide range from 38 to 889 GHz and medium output power from 0.1 kW to several kW. For the application to many fields, modulations and stabilization of both amplitude and frequency of their outputs have been achieved. The present status of the Gyrotron FU series is described.