Mr. Yuanli Xu Profile

Yuanli Xu

at Institute of Systems Engineering, CAEP

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Proceedings Article | 24 October 2016 Paper

Stability design of support systems in ICF lasers

M. Z. Zhu, W. K. Wu, G. Chen, H. Zhan, Y. L. Xu, X. J. Chen

Proceedings Volume 9682, 96820D (2016) https://doi.org/10.1117/12.2245722

KEYWORDS: Laser stabilization, Laser systems engineering, Optical components, Optical design, Laser development, Finite element methods, Error analysis, Optical testing, Mirrors, X-ray imaging

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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.

Proceedings Article | 24 October 2016 Paper

Field precision machining technology of target chamber in ICF lasers

Yuanli Xu, Wenkai Wu, Sucun Shi, Lin Duan, Gang Chen, Baoxu Wang, Yugang Song, Huilin Liu, Mingzhi Zhu

Proceedings Volume 9682, 96820G (2016) https://doi.org/10.1117/12.2245738

KEYWORDS: Optical spheres, Collimation, Laser applications, Optical alignment, 3D acquisition, Laser development, 3D modeling, Systems engineering, Roads, Space telescopes

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In ICF lasers, many independent laser beams are required to be positioned on target with a very high degree of accuracy during a shot. The target chamber provides a precision platform and datum reference for final optics assembly and target collimation and location system. The target chamber consists of shell with welded flanges, reinforced concrete pedestal, and lateral support structure. The field precision machining technology of target chamber in ICF lasers have been developed based on ShenGuangIII (SGIII). The same center of the target chamber is adopted in the process of design, fabrication, and alignment. The technologies of beam collimation and datum reference transformation are developed for the fabrication, positioning and adjustment of target chamber. A supporting and rotating mechanism and a special drilling machine are developed to bore the holes of ports. An adjustment mechanism is designed to accurately position the target chamber. In order to ensure the collimation requirements of the beam leading and focusing and the target positioning, custom-machined spacers are used to accurately correct the alignment error of the ports. Finally, this paper describes the chamber center, orientation, and centering alignment error measurements of SGIII. The measurements show the field precision machining of SGIII target chamber meet its design requirement. These information can be used on similar systems.

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