温度梯度是造成惯性约束聚变(ICF)驱动器中大口径光学元件变形的重要因素之一,靶场编组站是大口径光学元件较为集中的区域。利用靶场编组站周围温度的测量数据,得出了靶场编组站镜架的温度分布及变化特点,应用有限元分析软件对靶场编组站镜架24 h分时段的热应力和变形进行了分析计算,结果表明,靶场编组站镜箱内温度变化趋势基本一致,顶部相对底部温度梯度较大,两侧相对中间温度较高。当靶场编组站内温差为0.01 ℃左右或局部温差为0.1 ℃左右时,光学元件的镜面转角小于0.24 μrad,能够满足稳定性指标要求。

Temperature gradient is one of the most important factors which cause large deformation on large aperture optical element in inertial confinement fusion (ICF) drivers. In this paper,the ambient temperature around the switchyard was measured and the temperature distributing and changing characteristic with time was analyzed,which indicate that temperature changing trend inside of the switchyard is identical,and the temperature gradients of the uppermost part are higher than the bottom,and the temperatures of middle part are higher than the both sides. Loading the temperature on the finite element model of switchyard,gets the deformation of the optical element changing with time. The results indicate that temperature distribution has a great impact on the optical element,the change of mirrors can meet the request of target experiment when the switchyard has about 0.01 ℃ difference in temperature or about 0.1 ℃ partial difference in temperature.