Spallation Neutron Source Science Center, Dongguan, Guangdong 523803, China.
Rev Sci Instrum. 2023 Mar 1;94(3):034708. doi: 10.1063/5.0127489.
The application of high-power solid state amplifiers (SSAs) in accelerator facilities is increasing, and equipment failure caused by reflected power is the main risk to their long-term operation. High-power SSAs often comprise multiple power amplifier modules. Full power reflection is more likely to damage the modules in SSAs if the amplitudes of the modules are unequal. Optimization of the power combiners is an effective means for improving the stability of SSAs under high power reflection. This study analyzes the mechanisms and conditions of reflected power generation using the scattering parameters of the combiner and proposes an optimization scheme for the combiner. The simulation and experimental results show that some modules may receive reflected power as high as nearly four times the rated power of one module when the SSA meets certain conditions, which could damage the modules. The maximum reflected power can be effectively reduced and the anti-reflection ability of SSAs can be improved by optimizing the combiner parameters to suppress the maximum reflected power.
高功率固态放大器（SSA）在加速器设备中的应用正在增加，而反射功率引起的设备故障是其长期运行的主要风险。高功率 SSA 通常由多个功率放大器模块组成。如果模块的幅度不相等，那么全功率反射更有可能损坏 SSA 中的模块。优化功率合成器是提高高功率反射下 SSA 稳定性的有效手段。本研究利用合成器的散射参数分析了反射功率产生的机制和条件，并提出了一种合成器的优化方案。仿真和实验结果表明，当 SSA 满足某些条件时，某些模块可能会接收到高达近四倍于一个模块额定功率的反射功率，这可能会损坏模块。通过优化合成器参数来抑制最大反射功率，可以有效地降低最大反射功率，提高 SSA 的抗反射能力。
