Research on target alignment fiducials of high power laser facility

Target alignment technology is one of the most critical technologies in high-energy physics experiments, and is an important technology related to the success of the laser fusion experiment. This paper describes the error in the basic target alignment scheme, and designs a series of alignment fiducials around the target to achieve the improvement in target alignment precision. This paper analyzes the influence of fiducials-group’s forms on the target alignment error. According to their respective properties, under the constraints of the experimental conditions, and combined with the linear and nonlinear fiducials-group’s design, improvement of target alignment precision and error transfer are achieved. Under the experimental requirements of the SG-II-U facility, combined with the working conditions, a surrogate target with alignment fiducials-group is designed, and through the interaction of the fiducials-group and the alignment mark in viewers, the error of target recognition can be greatly optimized and the uncertainty of target alignment can be reduced.