Mr. Yanting Li Profile

Yanting Li

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Proceedings Article | 29 December 2023 Paper

Diamond turning and full-frequency band error measurement methods for x-ray focusing mirror molds

Kaiji Wu, Xingyu Bao, Fei Ding, Zheng Qiao, Zhigao Chen, Duo Li, Yutao Liu, Jiadai Xue, Wei Wang, Yanting Li, Jinliang Wang, Qiuyan Liao, Yuan Jin, Yangong Wu, Niandong Zhang, Peng Ji, Guo Li, Yuhao Li, Wensong Chai, Yanji Yang, Bo Wang

Proceedings Volume 12976, 129760E (2023) https://doi.org/10.1117/12.3004925

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Temporary sources and explosive celestial bodies in the universe can only be observed through their high-energy radiation, for example X-rays. The multilayer nested Wolter-I type focusing mirror is widely used in X-ray astronomical telescopes. The electroforming replication process can achieve batch high-precision production of Wolter-I type focusing mirrors, with the process flow of mold ultra-precision turning, ultra-smooth, coating, electroforming, and demolding. The fabrication of molds accounts for a large proportion in the process, and the molds accuracy and surface quality directly determine the optical performance of the mirrors. We built the DRL2000 ultra-precision lathe for mold turning of mission EP (Einstein Probe) and eXTP (enhanced X-ray Timing and Polarimetry mission). The swing straightness error of the guide rail was separated and compensated through trial cutting and reverse measurement methods to achieve a turning generatrix accuracy of peak-to-valley (PV)<0.2μm. An in-situ measurement device has been built based on the ultra-precision lathe. After adjustment the system measurement error can be controlled within 0.1μm. The corresponding spiral measurement path and coaxiality error separation method were studied and verified through experiments. An offline measurement device was built and based on it, an optical lever measurement method was preliminarily validated. Finally, a division method of medium-low frequency error and medium-high frequency error was proposed.

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