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One of the research projects of Multi-Beam Klystrons (MBKs) is to extend its bandwidth. The bandwidth of the MBKs strongly depends on its peak power and the cathode loading. In some applications, an S-band MBK with peak power of 30∼50kW, bandwidth of 10%, efficiency of more than 25%, and the lifetime of more than 3000 hours is needed. In order to realize wide bandwidth at low peak power, the S band...
The sheet electron beam focused by periodic cusped magnetic (PCM) focusing structure could transport more stable than uniform magnetic field because of diocotron instability. We simulated, fabricate and test a w sheet electron beam klystron with multi-gaps extended interaction cavities. To obtain particular intensity of magnetic field, two pieces of PCM focusing structure had a short distance, and...
This paper presents a new type of klystron, in which multiple sector-ring beam, coaxial beam tunnel with isolated gates, and coaxial RF circuit are adopted to facilitate an excellent all-round performance. A multiple sector-ring beam gun is designed, and the beam characters under various magnetic fields are analyzed.
This paper presents an All-in-one simulation method for klystron. The simulation results compared with conventional simulation results are also presented. Conventional simulation method calculates the klystron in part. The electron gun, beam-wave interaction and the collector are designed respectively, and thus the simulation results are inauthentic commonly. The All-in-one simulation method uses...
High-order mode oscillation occurred in an S-band experimental klystron with 300 MHz instantaneous bandwidth. The cause of the oscillation was analyzed and simulated. A method was proposed to suppress the oscillation through adjusting the structure and size of a resonant cavity in the tube, in which the high-order mode frequency can obviously be changed and the variation of the fundamental mode frequency...
An S-band high average power broadband MBK with peak power of 500kW, average power of 30kW and relative bandwidth of 10% is being developed in the Institute of Electronics, Chinese Academy of Sciences (IECAS). Two types of RF interaction system, cylindrical cavity and coaxial cavity are going to be used for getting required performance. The calculation results and relative technical problems for developing...
From 1960s the Institute of Electronics, Chinese Academy of Sciences (IECAS) began to study the broadband klystron. Many methods to extend bandwidth of klystron have been adopted and more than ten types of broadband klystron have been developed. Recently we have successfully broken through the bandwidth of 12% in S-band on the peak power level of 800 kW. This paper introduces the state-of-art of our...
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