This work describes the design and realization of a radio frequency (RF) system with a single klystron to power two conjunct independent cavities, namely, an RF quadrupole (RFQ) and a drift tube linac (DTL). In contrast with a two-klystron scheme, an RF system that adopts a single-klystron scheme for two accelerating cavities exhibits simpler configuration, smaller occupation area, and lower cost. However, the low intrinsic flexibility of the single-klystron scheme needs to be compensated by independent adjustment of RF field phases and amplitudes inside the two cavities. A proposed RF system design based on the single-klystron scheme includes a 4.77 dB power divider, an adjustable power attenuator, and a phase shifter. The power attenuator and phase shifter are set in different branches of the RF power transmission line. This design is used to power an RFQ and a downstream DTL in the Compact Pulsed Hadron Source (CPHS) at Tsinghua University. During commissioning, the amplitudes inside the RFQ and DTL and the relative phase difference between them can be adjusted independently. The 13 MeV proton beam commissioning result verifies the design parameters and effectiveness of the single-klystron-based RF system. A proton beam energy of 12.92 MeV and a beam peak current of 41.2 mA at the exit of DTL were achieved, and the beam transmission from the entrance of RFQ to the exit of DTL reached 88.6%.

这项工作描述了具有单个速调管为两个合相独立腔供电的射频（RF）系统的设计和实现，这两个腔分别是RF四极（RFQ）和漂移管直线加速器（DTL）。与双速调管方案相比，采用单速调管方案处理两个加速腔的射频系统具有更简单的结构，更小的占用面积和更低的成本。但是，单速调管方案的低固有柔韧性需要通过独立调整两个腔体内的RF场相位和幅度来补偿。提出的基于单速调管方案的RF系统设计包括4.77 dB功率分配器，可调功率衰减器和移相器。功率衰减器和移相器设置在RF功率传输线的不同分支中。此设计用于为清华大学的紧凑型脉冲强子源（CPHS）中的RFQ和下游DTL供电。在调试期间，可以独立调整RFQ和DTL内部的幅度以及它们之间的相对相位差。13 MeV质子束调试结果验证了基于单速调管的射频系统的设计参数和有效性。在DTL出口处获得了12.92 MeV的质子束能量和41.2 mA的束峰值电流，从RFQ入口到DTL出口的束传输达到了88.6％。13 MeV质子束调试结果验证了基于单速调管的射频系统的设计参数和有效性。在DTL出口处获得了12.92 MeV的质子束能量和41.2 mA的束峰值电流，从RFQ入口到DTL出口的束传输达到了88.6％。13 MeV质子束调试结果验证了基于单速调管的射频系统的设计参数和有效性。在DTL出口处获得了12.92 MeV的质子束能量和41.2 mA的束峰值电流，从RFQ入口到DTL出口的束传输达到了88.6％。