Design of a 10kW/28GHz gyrotron with a segmented emitter using controlled-porosity reservoir cathodes

In this paper, the design of a 10kW/28GHz gyrotron tube with an emitter ring based on a controlled-porosity reservoir (CPR) cathode is presented. CPR emitters provide significantly higher current density (up to 50 A/cm
²
), as well as, longer life time (10
⁵
hours) than conventional emitters. The main goals of this experimental tube are to evaluate the use of CPR emitters for gyrotron applications, as well as to study the effect of non-uniform emission on gyrotron operation.