Circular Electron-Positron Collider (CEPC) High-Efficiency Continuous-Wave Klystron Passes Scientific and Technological Achievement Appraisal (2025-03-18)

On March 14, 2025, the Institute of High Energy Physics (IHEP) of the Chinese Academy of Sciences (CAS) organized an appraisal meeting for the scientific and technological achievement of the "Circular Electron-Positron Collider (CEPC) High-Efficiency Continuous-Wave Klystron" in Beijing. The appraisal expert panel consisted of experts from the Aerospace Information Research Institute (AIR) of CAS, Tsinghua University, National Innovation Institute of Defense Technology, the 12th Research Institute of China Electronics Technology Group Corporation, University of Electronic Science and Technology of China, Southeast University, and China Institute of Atomic Energy. The panel listened to the project team's report on the development of the CEPC high-efficiency continuous-wave klystron, reviewed test reports, and conducted on-site inspections.

IHEP, in collaboration with Kunshan Guoli Electronic Technology Co., Ltd., adopted the core-stable bunching method to improve electron bunching efficiency. They overcame key technologies including high-power energy transmission, precision manufacturing processes for large components, and high-efficiency collector thermal management. A large-scale klystron process and high-power test platform were established, successfully developing a P-band (650MHz) high-efficiency continuous-wave klystron with an output power exceeding 800 kW and an efficiency surpassing 78%. Its performance indicators are internationally leading.

Through collaborative research, the project team has mastered the design and manufacturing process of high-efficiency continuous-wave klystrons, achieving independent control over core technologies such as electron guns and high-power ceramic windows, possessing complete independent intellectual property rights. The successful development of this klystron marks China's leap from "following" to "leading" in the field of accelerator core devices. It lays a solid foundation for the localization and application of klystrons used in major scientific facilities such as the Circular Electron-Positron Collider and the China Spallation Neutron Source, as well as in other fields, with broad prospects.

The expert panel agreed that the "Circular Electron-Positron Collider (CEPC) High-Efficiency Continuous-Wave Klystron" passes the scientific and technological achievement appraisal.

This project received support from the "Wang Yifang Scientist Studio" and IHEP's knowledge innovation funding.

High-Efficiency Continuous-Wave Klystron for CEPC