The beam power of the CEPC Collider is about 60 MW, so an efficiency of an RF power source is very important for cost of project implementation. The most popular source for an accelerator is a klystron, which has the advantage that it can be operated at high power with a reasonable high efficiency. IHEP is developing 650 MHz klystron with 800 kW CW output power and 80% efficiency. To reach this goal, a couple of klystron prototypes will be manufactured in the near future. The first prototype is completely manufactured by Institute of Electronics (IE) and GLVAC Company and the first step of high-power conditioning and commissioning is also completed in IHEP. The design schemes of high-efficiency klystron are also in progress.

中文翻译：

---

CEPC 650 MHz 速调管的进展

CEPC 对撞机的光束功率约为 60 MW，因此射频电源的效率对于项目实施成本非常重要。最流行的加速器来源是速调管，它的优点是可以在高功率下以合理的高效率运行。IHEP 正在开发具有 800 kW CW 输出功率和 80% 效率的 650 MHz 速调管。为实现这一目标，将在不久的将来制造几个速调管原型。第一台样机完全由电子研究所（IE）和GLVAC公司制造，大功率调节和调试的第一步也在IHEP完成。高效速调管的设计方案也在进行中。