CSNS LINAC低电平射频控制系统软件设计

低电平射频控制系统主要用于对加速腔的高频场和谐振频率的控制，保证加速器的稳定运行并输出高品质的束流。低电平控制系统软件提供可视化操作界面，实现数据显示和存储、自动化算法等功能，提高了低电平系统的可操作性，减少了人工作业量和故障率。软件开发具有灵活性强、开发周期短的特点，适合控制速度要求相对不高而逻辑较为复杂的功能开发。本文介绍中国散裂中子源直线加速器射频低电平控制系统软件的开发设计，重点介绍前馈自动计算、加速腔的频率自动控制、频率失谐算法、一键升功率、界面优化等相关内容。最终低电平控制系统幅度相位稳定度指标优于要求的设计指标，且达到长时间稳定运行的要求。

Design of Low Level Radio Frequency Control Software for CSNS LINAC

The low-level radio frequency control system(LLRF) is mainly used to control the electric field and resonate frequency of the accelerating cavity to ensure the stable operation of the accelerator and output high-quality beam. The LLRF software provides a graphical user interface, and realize the functions such as data display and storage, as well as some algorithm like automatic logic and so on. A well-designed LLRF software improves the operability of the LLRF and reduces the amount of manual work and failure rate. This paper introduces the development and design of LLRF software for China spallation neutron source(CSNS) linac, mainly including feedforward automatic calculation, automatic frequency control of acceleration cavity, frequency detuning algorithm, automatic RF power up and so on. Finally, the amplitude and phase stability index of the system is better than the required design index, and meets the requirements of long-term stable operation.