An Efficient Eigensolver for Extended Interaction Klystrons Based on Finite Element Method

Abstract

This paper presents an efficient eigensolver based on finite element method (FEM) for metallic-lossy multigap cavities in extended interaction klystrons (EIKs). By modeling a W-band sheet-beam EIK (SBEIK), the eigensolver is validated. Moreover, it is found that our eigensolver is much more efficient than the widely used commercial FEM code i.e. HFSS, which would be very useful for the design of multigap cavities of EIKs.