Design and high-power test of 800-kW UHF klystron for CEPC

作     者：Ou-Zheng Xiao Shigeki Fukuda Zu-Sheng Zhou Un-Nisa Zaib Sheng-Chang Wang Zhi-Jun Lu Guo-Xi Pei Munawar Iqbal Dong Dong 肖欧正;Shigeki Fukuda;周祖圣;Un-Nisa Zaib;王盛昌;陆志军;裴国玺;Munawar Iqbal;董东

作者机构：Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China High Energy Accelerator Research OrganizationKEKOhoIbaraki 305-0801Japan 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2022年第31卷第8期

页      面：154-159页

核心收录：

学科分类：080901[工学-物理电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 08[工学] 070202[理学-粒子物理与原子核物理] 0702[理学-物理学] 

基　　金：Project supported by Yifang Wang’s Science Studio of the Ten Thousand Talents Project 

主　　题：klystron cavity beam–wave interaction circular electron positron collider(CEPC) high-power test 

摘      要：To reduce the energy demand and operation cost for circular electron positron collider(CEPC), the high efficiency klystrons are being developed at Institute of High Energy Physics, Chinese Academy of Sciences. A 800-k W continuous wave(CW) klystron operating at frequency of 650-MHz has been designed. The results of beam–wave interaction simulation with several different codes are presented. The efficiency is optimized to be 65% with a second harmonic cavity in three-dimensional(3D) particle-in-cell code CST. The effect of cavity frequency error and mismatch load on efficiency of klystron have been investigated. The design and cold test of reentrant cavities are described, which meet the requirements of RF section design. So far, the manufacturing and high-power test of the first klystron prototype have been *** the gun operated at DC voltage of 80 k V and current of 15.4 A, the klystron peak power reached 804 k W with output efficiency of about 65.3% at 40% duty cycle. The 1-d B bandwidth is ±0.8 MHZ. Due to the crack of ceramic window, the CW power achieved about 700 kW. The high-power test results are in good agreement with 3D simulation.