LINAC2026 - 33rd Linear Accelerator Conference

A high efficiency 650 MHz/800 kW CW Klystron for CEPC

Not scheduled

2h

Daejeon Convention Center

Poster Presentation MC4.A06: RF power sources and power couplers Poster Session

Speaker

Ouzheng Xiao (Institute of High Energy Physics, National Synchrotron Radiation Laboratory)

Description

The next-generation large colliders, such as FCC and CEPC, propose unprecedented demands on the energy efficiency of radio-frequency (RF) power sources. For CEPC, whose RF system alone will require over 100 MW of wall-plug power, the 650 MHz / 800 kW continuous‑wave (CW) klystron is a mission-critical component. To meet this challenge, IHEP has launched a dedicated high-efficiency klystron program with the ambitious target of exceeding 80% efficiency. Here, we report a landmark breakthrough achieved with the second prototype.Dduring high‑power testing, the tube delivered 803 kW of CW output power with an efficiency of 78.5%. The test results of this klystron have been reviewed and accepted by the expert panel.This transformative improvement in efficiency will slash the energy demand and operating cost of future large-scale accelerators.This paper will present the detailed progress of this prototype, highlighting the key advances that have enabled this major step forward in high-efficiency klystron technology for CEPC.