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Stability Design of Support Systems in ICF Lasers

机译：ICF激光器支撑系统的稳定性设计

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Within Inertial Confinement Fusion (ICF) laser systems, many independent laser beams are required to be positioned on target with a very high degree of accuracy until shots are complete. Optical elements that are capable of moving a laser beam on the target must meet the pointing error budget. Optical elements are typically supported by systems which consist of mounts, mount frames, support structures, and foundation. The stability design for support systems in ICF laser have been developed based on the designing and evaluating experience of ShenGuangⅢ (SGⅢ). This paper will provide the methodology of position error budget. The stability allocation is developed for evaluating the performance of support systems when they are subjected to multiple sources of excitations that can cause the motion of optical elements during alignment procedures and before shots. The vibrational stability design considerations of support systems are discussed on the fundamental frequency, ambient random vibration, and modal damping. The support structures of optical elements are the relatively large and massive hybrid structure of reinforced concrete and steel frame or vessels. While the reinforced concrete portions provide optical elements stability, the steel portions afford design flexibility. Finite element analyses of ambient random vibration are typically performed to evaluate the vibrational stability performances of support systems. Finally, this paper describes the ambient random vibration and beam pointing error measurements of SGIII. The measurements show the support systems of SGIII meet design requirement. These information can be used on similar systems.
机译：在惯性约束聚变（ICF）激光系统中，需要许多独立的激光束以非常高的精度定位在目标上，直到射完为止。能够在目标上移动激光束的光学元件必须满足指向误差预算。光学元件通常由包括支座，支座框架，支撑结构和基座的系统支撑。基于神光Ⅲ（SGⅢ）的设计和评估经验，开发了ICF激光器支撑系统的稳定性设计。本文将提供位置误差预算的方法。稳定性分配用于评估支撑系统在受到多种激发源的影响时的性能，这些激发源可能会导致光学元件在对准过程中和射击前运动。讨论了支撑系统的振动稳定性设计注意事项，包括基本频率，环境随机振动和模态阻尼。光学元件的支撑结构是钢筋混凝土和钢框架或容器的相对较大且庞大的混合结构。钢筋混凝土部分提供了光学元件的稳定性，而钢部分则提供了设计上的灵活性。通常对环境随机振动进行有限元分析，以评估支撑系统的振动稳定性能。最后，本文介绍了SGIII的环境随机振动和光束指向误差的测量。测量结果表明，SGIII的支撑系统符合设计要求。这些信息可以在类似的系统上使用。

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