Compact and High-efficiency Metamaterial Extended Interaction Oscillator

A highly efficient and compact metamaterial extended interaction oscillator (MEIO) is characterized and designed. The power exchange function of the multiple-gap extended interaction resonant cavity loading the proposed metamaterial is investigated for the π mode. Furthermore, the cavity diameter of 5-gap MEIO is only 37 mm at S-band. The CST PIC simulations show the peak output power of about 10 MW and the electronic efficiency up to 48% at 2.866 GHz when the beam voltage and current are 130 kV and 80 A, respectively, and the focusing magnetic field is 2000 G. The simulation results suggest that the proposed MEIO has the potential application in the future accelerators as an MW-level high-efficiency, miniaturized microwave source.