A 166.6-MHz 50-kW power transmitter is required to drive the dressed superconducting radio-frequency (RF) cavity during horizontal tests and to condition the fundamental power couplers as well as higher-order-mode ferrite absorbers. A highly modular yet compact amplifier adopting solid-state technologies was therefore developed in the framework of High Energy Photon Source - Test Facility. All power amplifier and power supply modules are pluggable from the front panel of the amplifier system. A 3-stage power combining topology was realized by using 32 power amplifier modules, 4 eight-way stripline power combiners, 2 two-way 35-kW coaxial power combiners, and 1 two-way 65-kW coaxial power combiner. Each power amplifier module is equipped with individual circulator and load utilizing an optimized cooling circuit design to ensure the entire amplifier system to be operational in both full-transmission and full-reflection scenarios. No final-stage high-power circulator or load is needed. The amplifier system is tunable in pulsed mode for any duty factors and fully functional in the continuous-wave mode as required. Excellent noise suppression and high wall-plug-to-RF efficiency were achieved at nominal power. Comfortable redundancies for both power amplifier and power supply modules were reserved to compensate for any hardware degradations during operations. Temperature, current, voltage, and RF signal of each module as well as cooling were monitored and managed by using EPICS in the control system of the amplifier. An interlock system was also integrated as well as an event logging system for post-mortem analysis. The system has accumulated over 2000hours of operation. The design and performance tests of the first 166.6-MHz 50-kW modular solid-state power amplifier are presented.

在水平测试期间，需要一个 166.6-MHz 50-kW 功率发射器来驱动修整过的超导射频 (RF) 腔，并调节基本功率耦合器以及高阶模式铁氧体吸收器。因此，在高能光子源 - 测试设施的框架内开发了一种采用固态技术的高度模块化但紧凑的放大器。所有功率放大器和电源模块均可从放大器系统的前面板进行插拔。采用32个功放模块、4个八路带状线功率合路器、2个二路35kW同轴功率合路器和1个二路65kW同轴功率合路器，实现了三级合路拓扑。每个功放模块都配备了单独的循环器和负载，采用优化的冷却电路设计，以确保整个功放系统在全传输和全反射情况下都能正常运行。不需要末级大功率循环器或负载。放大器系统可在脉冲模式下针对任何占空比进行调谐，并根据需要在连续波模式下完全发挥作用。在标称功率下实现了出色的噪声抑制和高墙插至射频效率。为功率放大器和电源模块保留了舒适的冗余，以补偿操作期间的任何硬件退化。每个模块的温度、电流、电压和射频信号以及冷却都通过在放大器的控制系统中使用 EPICS 进行监控和管理。还集成了一个联锁系统以及一个用于事后分析的事件记录系统。系统累计运行时间超过2000小时。介绍了第一款 166.6 MHz 50 kW 模块化固态功率放大器的设计和性能测试。