Abstract
Recent research progresses in Multi-Beam Klystron (MBK) in IECAS are briefly introduced in the letter. The S-band MBKs of IECAS have peak power of 120–250 kW, average power of 4–9 kW, efficiency of 35–45%, gain of 41–46 dB, beam voltage of 15–19 kV, and weight of 40–45 kg. Some key technical problems of MBK are also described and discussed. Among them, improving the design of MBK to obtain the required bandwidth, raising beam transmission to increase average power, eliminating oscillation and spray spectrum, overcoming window breakdown caused by magic mode, reducing breakdown times of electron.gun, are most important things for the practical MBK. Besides, further research work in MBK in IECAS is commented.
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