Long pulse relativistic klystron operation at 1.3 GHz

Summary form only given, as follows. A two-cavity relativistic klystron based on the design of M. Friedman et al. (J. Appl. Phys., vol.64, p.3353, 1988) has been under test for several months. The field emission foilless diode, which generates the relativistic electron beam, has been designed for long-pulse 100-Ω operation for beam energies ranging between 300 and 600 keV. An attempt has been made to extend the duration of high-power operation of this klystron to the microsecond regime. Data on diode operation, beam bunching, cavity RF powers, and extracted RF power into a load were obtained