Abstract
Extended interaction klystrons operating in high-order mode can establish more sufficient axial electric field than the fundamental mode in a large size cavity. However, this structure suffers greatly from the mode competition because of the combination of axial and transverse modes. This paper presents the mode competition analysis of a coaxial extended cavity operating in TM31 mode through particle-in-cell (PIC) simulation. Meanwhile, applying dielectric loads in the proper position can effectively suppress the mode competition of this structure, while the TM31 mode has little interaction with the dielectric loads.
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