Study of Broadening the Bandwidth for Sheet Beam Extended Interaction Klystron

Abstract

The mode overlapping technology is employed in extended interaction klystron (EIK) to broaden the bandwidth. For a compact resonant cavity with small number of gaps, the weak-coupling structure enables the superposition of $2\pi$ mode and the adjacent longitudinal mode. The two operating modes are carefully optimized to have similar high-frequency characteristics and power extractions. Finally, a simple two-cavity circuit verifies the feasibility of the scheme.