Abstract
The technological progress on Multi‐Beam Klystrons (MBKs) at the Institute of Electronics, Chinese Academy of Sciences (IECAS) is presented in this paper. Topics to be discussed include the development of cathodes with high current densities and low evaporation rates; multi‐beam electron guns with reduced chances for breakdown; multi‐beam electron optics systems with high beam transmission; RF systems with wide bandwidth and high efficiency; the oscillation and broad spectrum noise caused by non‐operational modes and reflecting electrons; and computer simulations of the multi‐beam electron optics system and beam‐wave interaction. In addition, the research progress of several types of MBKs developed in IECAS is reported. These MBKs range in frequency from L‐ to X‐band with corresponding peak powers ranging from several tens to several hundreds of kilowatts, average powers from several kilowatts to tens of kilowatts, and bandwidths from 3% to 12%.
Published Version
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