At the ELBE Center for High-Power Radiation Sources, electrons are accelerated to an energy of up to 40 MeV in a superconducting linear accelerator that is operated in continuous wave (CW) mode. The acceleration is achieved using superconducting radio frequency (RF) cavities, which are driven by an analog low-level RF (aLLRF) system and solid-state-based RF amplifiers. The analog aLLRF system was transformed to a digital system based on the MicroTCA standard. It is in user operation since 2020. Here, the new digital system and its integration in the ELBE control system are described. Furthermore, the system is characterized by noise measurements and shows rms field stability of the digital LLRF (dLLRF) system of 0.01° in phase and 0.005% in amplitude. In addition, an algorithm for compensating long-term drifts is presented and characterized.

中文翻译：

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基于 MicroTCA.4 的低电平 RF，用于 ELBE 加速器上的连续波模式操作


在 ELBE 高功率辐射源中心，电子在以连续波 (CW) 模式运行的超导直线加速器中被加速到高达 40 MeV 的能量。加速是通过超导射频 (RF) 腔实现的，该腔由模拟低电平射频 (aLLRF) 系统和基于固态的射频放大器驱动。模拟aLLRF系统转变为基于MicroTCA标准的数字系统。该系统自 2020 年起投入用户运行。本文介绍了新的数字系统及其在 ELBE 控制系统中的集成。此外，该系统的特点是噪声测量，并显示数字 LLRF (dLLRF) 系统的均方根场稳定性为 0.01° 相位和 0.005% 幅度。此外，还提出并表征了一种补偿长期漂移的算法。