A control system is designed for performing the alignment of the incident laser beam and the determination of the measuring region of Thomson scattering diagnostic, which measures the electron temperature and density during plasma discharges on EAST, and the accuracy of the system is very important for the measurements. To save precious operation time during the experiment, with the control system involved, a fast and convenient method of laser alignment control has been given. The target controller based on SCM PIC16F874A of the system will be mainly discussed, which has the capability of failure recovery, optical fiber communication, small size, etc, compared with the traditional step motor controller. It has been employed in EAST Thomson scattering diagnostic, and reduced significantly the time needed for the optical alignment due to reliable operation and precise control.%设计了一种激光光路定位控制系统,用于EAST汤姆逊散射诊断的光路准直和测量区域的定位,其精确性对于该诊断的测量尤为重要,该诊断用于测量EAST装置放电时等离子体的电子温度和密度；为节约宝贵的实验时间,结合该系统给出一种快捷的激光光路定位方法；重点描述该系统中基于单片机PIC16F874A设计的靶板控制器,与传统步进电机控制器相比,具有故障恢复、支持光纤通信、体积小等优点.该系统已在2010年度的EAST实验中投入使用,运行可靠,定位精确,大幅缩短了光路准直所需时间.
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