传统的医疗及工业用直线加速器系统中一直使用磁控管作为功率源，特别是一些紧凑型加速器系统中，磁控管因为其尺寸与重量的优势成为唯一选择。通过利用多注速调管的低电压、尺寸小、重量轻的特点，研制成功功率量级远超磁控管同时尺寸重量接近的多注速调管，这将会为医疗及工业领域带来新的应用模式与产品类型。为满足医疗及工业辐照用中低能电子直线加速器的需求，近年来已研制出各类型高峰值功率速调管，在癌症治疗、无损检测、工业辐照等方面获得了广泛应用。介绍了一种小型化加速器用X波段多注速调管，其具有工作电压低、效率高、体积小、重量轻等特点，可应用于中低能放疗设备及小型化无损检测整机的加速器系统中。本管研制中重点解决了一体化线包聚焦、集成式冷却等技术，样管尺寸为?200 mm×400 mm，重量为25 kg。三支样管测试已可稳定获得峰值输出功率3 MW。

In common medical/industrial linac systems, ordinary magnetron as the power source has been adopted for about 20 years. Despite of the low power level and the short life time, magnetron is the only choice to drive the compact linac system due to its size and weight. With the development of multi-beam klystron technique, working voltage and the system size can be reduced dramatically while the power level and average power have taken a big step forward. Typically, a magnetron in X-band can supply a 2 MW microwave power maximum, which gives great challenge for the linac system engineering. To meet the demands from medical and industrial applications, high-power klystrons were developed for cancer treatment, nondestructive inspection and industrial irradiation. This paper introduces an X-band high-power multi-beam klystron with 3 MW output power at 9300 MHz. Compared with the magnetron power source, the linac cavity could be reduced by 30%. Based on the integrated coil and oil cooling system, the boundary dimension could be reduced to ?200 mm×400 mm with the total weight of 25 kg.