CEPC RF power sources at TDR

Purpose Radio frequency power supply system is an important part of Circular Positron Collider (CEPC). S-band klystron and C-band klystron supply power. More efficient S-band and C-band klystron prototypes are planned to move the project forward.
Methods In TDR, the klystron optimizes electron beam bunch-clustering with BAC, gains favorable RF source params via simulations & comparisons. The remaining part is mainly through debugging to obtain the best operating parameters.
Results Currently, RF power supply designs for collision ring, booster ring, linear accelerator injector and damping rings are feasible. IHEP's 650 MHz, 800 kW klystron reaches an efficiency target of above 80%. Beam dynamics for 2860 MHz (80 MW) and 5720 MHz (80 & 50 MW) klystrons are finalized and in prototyping.
Conclusions Efficient klystron development is crucial for CEPC's success, ensuring energy transmission, beam stability, and promoting eco-friendly design. Current design transitions smoothly to EDR, a key milestone. It meets domestic science equipment needs, boosting localization and innovation.