Nested focusing X-ray telescope with lightweight and large photon collecting area

被引：0
|
作者：
Li B. [1 ,2 ]
Li H. [1 ,2 ]
Cao Y. [1 ]
Sang P. [1 ]
Liu Y. [1 ]
Yu D. [1 ,2 ]
机构：
[1] National Space Science Center, Chinese Academy of Sciences, Beijing
[2] University of Chinese Academy of Sciences, Beijing
来源：
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | 2023年 / 44卷 / 03期
基金：
中国国家自然科学基金;
关键词：
grazing incidence parabolic mirrors; nested focusing X-ray telescope; Pulsar navigation; X-ray astronomical satellite; X-ray focusing;
D O I：
10.7527/S1000-6893.2022.26671
中图分类号：
学科分类号：
摘要：
Nested focusing X-ray telescopes have a wide range of demands in the fields of pulsar autonomous navigation and X-ray astronomy. The optical optimization design of a compact，large-area，and nested focusing X-ray telescope is carried out in this paper，and the process of thermoforming，precision mirror cutting，and nested coaxial confocal of X-ray grazing incidence mirrors are successfully explored based on lightweight flat glass. A lightweight，large-area，Nested Focusing X-ray Telescope（NFXT）has been developed. The axial length of single-layer mirror of NFXT is 300 mm，and the thickness is 0. 3 mm. The Ir metal film is sputtered on the reflective surface of curved mirror with 300 nm thickness，and the roughness of the metal coating is better than 0. 3 nm（rms）. The NFXT has 11 layered nested mirrors in the radial direction，with each layer consisting of three equal sectors in the circumference direction. The inner 8 layers are the conical mirrors that are approximately parabolic，and the outer 3 layers are parabolic mirrors. The 11 layers of mirrors are assembled into the same axis and same focus. The net geometric area of the NFXT engineering prototype is 175 cm2，with the effective area being 130 cm2@1. 5keV，and the focal spot radius of 0° field of view being 0. 85 mm（EoE=50%）. The engineering prototype weighs 4. 25 kg，having an envelope size of diameter×height 200 mm×326 mm，0. 2-12 keV energy response range and back working distance of 1 300 mm. The breakthrough of the NFXT technology provides key technical support for the domestic pulsar navigation experiments and advanced X-ray astronomical satellites. © 2023 AAAS Press of Chinese Society of Aeronautics and Astronautics. All rights reserved.
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