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激光驱动ICF装置的甚多束激光在打靶过程中需要高精度定位于靶面,这就要求可以改变光束着靶点位置的光学元件满足定位误差指标要求。首先介绍光束定位误差分解方法,在光束对准过程中和打靶前,在多源激励作用下能改变光束着靶点位置的光学元件需要评估其支撑系统的稳定性设计,发展了光学元件稳定性指标分解方法用于其支撑系统的稳定性评估。从基频、环境随机振动、模态阻尼的角度讨论了支撑系统振动稳定性设计思路。光学元件的通用支撑系统采用大而重的钢筋混凝土和钢结构的混合结构,钢筋混凝土保证光学元件稳定性的同时,钢结构提供结构设计的灵活性。采用有限元技术分析光学元件在宽频环境随机振动作用下的响应,评估支撑系统的振动稳定性设计。描述了神光III宽频环境随机振动和光束定位误差的测量,测量结果表明神光III支撑系统满足设计要求,该技术能应用于激光驱动ICF装置支撑系统的设计。
Laser-driven ICF devices, many of the laser beam in the target during the shooting process requires high-precision positioning, which requires the beam can change the target location of optical components to meet the positioning error index requirements. Firstly, the method of beam localization error decomposition is introduced. Before optical beam alignment and target shooting, the optical elements that can change the target position of the beam under multi-source excitation need to evaluate the stability design of the supporting system and develop the stability of the optical element The index decomposition method is used to evaluate the stability of its support system. From the perspective of fundamental frequency, random vibration of environment and modal damping, the design of vibration stability of supporting system is discussed. The common support system for optical components uses a large and heavy mixed structure of reinforced concrete and steel structure, while the stability of optical components is ensured by the reinforced concrete, and the structural flexibility of the steel structure is provided. The finite element method is used to analyze the response of optical components under random vibration in wideband environment. The vibration stability of the support system is evaluated. This paper describes the measurement of random vibration and beam positioning error of SG-III broadband environment. The measurement results show that the SG-III support system meets the design requirements. The technology can be applied to the design of laser-driven ICF device support system.