反转永磁聚焦C波段高功率多注速调管作为加速器系统的功率源，具有脉冲输出功率高、平均功率大、寿命长的优势，在工业辐照、放射治疗、无损检测等领域具有广阔的应用前景。设计并研发了一种可用于加速器系统的反转永磁聚焦C波段高功率多注速调管。其电子光学系统采用多电子注、周期反转永磁聚焦技术，高频系统工作在TM₂₂₀高次模式、多腔参差调谐，散热采用水冷方式。通过计算确定了结构参数，研制出速调管样管，通过测试，获得了大于3 MW的峰值输出功率，和计算结果相吻合。

Based on the fundamental principle oriented from the single beam klystron, multi-beam klystron can make higher peak output power under a lower working voltage with the help of parallel working mode combining several low perveance electron beams. Lower working voltage also makes a contribution to the compact design of the whole system. In the linac system design, input power source is the key factor that determines the composition of the whole system. The increasement of the source power can shorten the linac tube dramatically, thus make the brand-new application scenarios possible such as the high-degree freedom cancer treatment or the compact nondestructive testing system. The C-band multi-beam klystron in this article mainly targets on the low and medium energy accelerator applications, which can give out the microwave power at higher rep-rate (500 Hz) and higher working ratio (0.2%).