在230 MeV超导回旋加速器中，磁场调节棒及其驱动系统是束流调试的重要辅助装置。为满足束流对中和束流引出所需的磁场，设计并研制了16套磁场调节棒及其驱动装置。机械执行机构采用美国Thomson公司的精密直线执行器，其重复定位精度为±0.01 mm，位置传感器采用德国Novotechnik公司的直线位移电子尺，其重复精度为0.002 mm。此外，运动控制采用PLC加直线位移传感器负反馈闭环的方案。在实际工况下，系统定位精度达到0.05 mm，重复精度达到±0.02 mm，优于设计要求。此外，对该系统进行了静电放电测试、电快速瞬变脉冲群测试和浪涌抗扰度测试，结果满足医用电气设备电磁兼容标准YY 0505-2012/IEC 6060 1-1-2:2004的要求。该驱动系统的研制，克服了在强电离辐射、高磁场强度、狭小安装空间的特殊环境中达到高定位精度和高重复精度的难点，对优化束流的径向进动、减小加速区域的相干振荡振幅、提高引出区的束流引出效率等具有重要意义。

The magnetie field adjustable rod (Trim-rod) and its driving system are the important auxiliary device for beam debugging in CYCIAE-230. To get the magnetic field playing a key role in maintaining the beam alignment and extraction, 16 sets of Trim-rods and driving systems were developed. First, the precise linear actuator from Thomson of The United States was used as the mechanical actuator, whose repeated positioning accuracy is ±0.01 mm. Second, the position sensor adopted the linear displacement electronic ruler from Novotechnik of Germany. The repeated positioning accuracy of the electronic ruler is 0.002 mm. In addition, a negative feedback control loop based on PLC module and linear displacement sensor was adopted in Trim-rods movement regulation. In fact, the positioning accuracy and repeatable precision of Trim-rod drive system were 0.05 mm and ±0.02 mm, respectively. Moreover, the system weat through the electrostatic discharge test, electrical fast transient/Brust test and surge immunity test, all met the requirement of YY 0505-2012/IEC 6060 1-1-2:2004. It is proved that the developed Trim-rod driving system can get high positioning accuracy and repeatable precision in high-dose ionizing radiation, high-density magnetic field and narrow space. It is very significant for radial oscillation amplitude minimization, avoiding coherent oscillation and increasing high beam extraction efficiency.