温度瞬变是影响惯性约束聚变(ICF)驱动器中大口径光学元件结构稳定性的一个重要的激励因素。采用多通道高精度温度监测仪对原型装置中编组站大口径光学元件环境温度进行了24 h监测，得到了编组站光学元件环境温度24 h温度变化曲线; 采用有限元分析软件建立了光学元件的有限元模型，把温度监测结果作为载荷，对光学元件进行了热结构耦合分析。分析得到了大口径光学元件面形在24 h内的变化曲线，光学元件环境温度24 h内最大变化范围为0.45 ℃，24 h光学元件最大转角变化为1.12 μrad。分析结果表明，光学元件转角最大变化已超过打靶对光学元件稳定性的要求，但通过调整打靶时间，缩短光路准直之后打靶的等待时间可有效提高打靶的成功率。

Transient change of temperature is an important exciting factor which affects the structure stability of large-aperture optical element in the inertial confinement fusion (ICF) driver. Multi-channel high-precision temperature monitoring instrument is adopted to measure the circumstance temperature of large-aperture optical element in the switchyard of the technical integration line (TIL) for 24 h. The temperature changing curve with time is got. The finite element software is used to build the finite element model for the optical element is built. With the measured temperature as the load, the plane rotation curve of the large-aperture optical element in 24 h is analyzed. During 24 h, the circumstance temperature change is 0.45 ℃, and the maximum rotation angle is 1.12 μrad. The results indicate that the largest rotation of the optic element exceeds the requirement of beam shot change range, but the success ratio of beam shot can be improved by adjusting beam shot time and reducing waiting time between alignment and beam shot.