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Design Consideration of 650-MHz Circular Electron–Positron Collider Klystron and Simulation of Its Beam Tester |
| Un-Nisa Zaib1,2,3**, Shigeki Fukuda1,4, Zu-Sheng Zhou1,3, Dong Dong1,3, Sheng-Chang Wang1,3, Ou-Zheng Xiao1,3, Zhi-Jun Lu1,2,3, Guo-Xi Pei1,3 |
1Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049
2University of Chinese Academy of Sciences, Beijing 100049
3Key Laboratory of Particle Acceleration Physics and Technology, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049
4High Energy Accelerator Research Organization, KEK, Oho, Ibaraki 305-0801, Japan
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Un-Nisa Zaib, Shigeki Fukuda, Zu-Sheng Zhou et al 2017 Chin. Phys. Lett. 34 012902 |
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Abstract We present the first phase R&D for the 800 kW cw, 650 MHz klystron for the future circular electron–positron collider (CEPC) project in China. The CEPC requires 192 klystrons and it is desired to be designed in the Institute of High Energy Physics, CAS, and manufactured domestically. Therefore, we present the manufacturing schedule of this project; the three-stage development from the beam test tube to the klystron having a high efficiency structure. Design of the beam test tube that comprises electron gun and collector is presented. First, gun simulation having a modulating anode is performed using DGUN software. The uniform beam trajectories with a beam perveance of 0.64 $\mu$A/V$^{3/2}$ are simulated. We employ a Ba-dispenser cathode of radius 35 mm with $\phi$10 hole at the center and obtain a current density on cathode less than 0.45 A/cm$^{2}$. The beam trajectories are also simulated over beam test tube of length about 2 m with a magnetic field of 213 Gauss. Thermal analysis of the collector is performed using the ANSIS-CFX code and hence the cooling structure is determined. Mechanical design is almost carried out and it is in manufacturing stage.
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Received: 23 September 2016
Published: 29 December 2016
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| Fund: Supported by the National Natural Science Foundation of China under Grant No 11475201, and the Innovation and Technology Fund of Institute of High Energy Physics. |
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