系统介绍了神光-Ⅲ主机装置靶场光传输系统的结构设计,光传输系统的关键性能包括稳定性、精确性及洁净性,为保证苛刻的稳定性要求,提高结构动力学稳定性的同时提出一种新的稳定性分析方法；通过设计在线可更换单元、运动学支承结构和采用低应力夹持技术实现在线精密调节和快速安装定位；同时在设计、制造和安装过程中建立洁净理念。目前安装完成的束组的测试结果表明,主机装置靶场光传输系统的结构设计满足装置设计要求。

The beam transport system which is an important composition of laser facility target area provides guidance and collimation for laser beams. In this paper, the structural design of the beam transport system of SG-Ⅲ target area is introduced. The main performance of the beam transport system consists the stability, accuracy and cleanliness. In order to meet the stringent stability requirement, the dynamic stability of structure was improved and a new stability analytical method was proposed. The requirement of exact adjusting and fast online replacement was assured by the design of the Line Replaceable Units, the kinematic mounts structure, and the low-stress holding of the mirror mounts. Simultaneously, the clean conception was established in design, fabrication, and operation. The testing results of the installed part of the beam transport system indicate that the structural design satisfies the performance requirements of facility.