A disturbance observer (DOB)-based control approach was verified using the low-level radio-frequency systems of superconducting (SC) cavities operated in a continuous wave (CW) mode in a compact energy recovery linac (cERL) at KEK. This approach compensates for both predictable and unpredictable disturbances in a radio frequency (rf) system such as beam loading, Lorentz force detuning, and microphonics. This paper generalizes the DOB method in pulsed SC rf systems in the cERL at KEK. The results show that the pulse-to-pulse stabilities of the rf system are improved as expected by using this control approach. Furthermore, this method is validated by successfully compensating long pulse beam-loading effects in cERL.

中文翻译：

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基于干扰观测器的控制在脉冲超导射频腔中的应用

在KEK的紧凑型能量回收直线加速器（cERL）中，以连续波（CW）模式运行的超导（SC）腔的低级射频系统验证了基于干扰观测器（DOB）的控制方法。这种方法可以补偿射频（rf）系统中的可预测和不可预测的干扰，例如波束负载，洛伦兹力失谐和麦克风。本文概括了KEK cERL中脉冲SC射频系统中的DOB方法。结果表明，通过使用这种控制方法，射频系统的脉冲至脉冲稳定性得到了预期的改善。此外，该方法通过成功补偿cERL中的长脉冲光束加载效应而得到验证。