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X射线聚焦望远镜光学设计
Optical design of X-ray focusing telescope

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强鹏飞 ^1,2 盛立志 ¹ ^* 李林森 ^1,2 闫永清 ¹ 刘哲 ¹ 周晓红 ¹

文摘	X射线聚焦望远镜是X射线空间观测的重要设备,针对X射线聚焦望远镜光学设计工作,采用掠入射原理对X射线进行聚焦,利用蒙特卡罗算法仿真镜片面型和粗糙度对角分辨率影响,并确定了不同分辨率水平对镜片面型的不同需求;对X射线聚焦望远镜有效面积进行分析,并确定了膜层结构、层数与有效面积的关系,最终完成了焦距5.25 m、嵌套层数45层,有效面积为842和563 cm~2@6 keV的X射线聚焦望远镜设计.
其他语种文摘	X-ray focusing telescope is one of the most important equipment for X-ray space observation, which is designed based on the grazing incidence principle. The purpose of x-ray observation is to detect the black holes of various sizes in outer space, and the data obtained by X-ray telescope conduces to investigating the basic physical law under the condition of extreme gravity and magnetic field, In this article, multi-layer telescope is designed to satisfy the demand for enhanced X-ray timing and polarimetry mission. in which the telescope is designed based on Wolter-I telescope. The Monte Carlo method and power spectral density are used when the relationship between mirror profile and roughness with angular resolution is investigated. We analyze the relationship between angular resolution and mirror profile, and the result shows that the higher mirror profile possesses higher angular resolution. When the root mean square(RMS)of mirror profile is 0.04 μm, PV is 0.2 μm and roughness is 0.4 nm, the mirror angular resolution is 6.3" and it will change to 30.6" when the RMS of mirror profile is 0.2 μm, PV is 1 μm and roughness is 0.4 nm. The angular resolution out of focus is also investigated in this article, and the more defocusing amount gives rise to the worse angular resolution because defocusing spot will be larger than that of focal plane. So the maximum defocusing amount of 5 mm is required when the focal plane detector is installed. The relationship between effective area with film structure and layers number is also investigated. The film with Au mixed with C has a higher reflectivity than the film with only Au, because the mixed film will generate an interference effect and enhance the intensity of reflecting X-ray. When the telescope layers increase, the effective area and telescope weight are both improved, the requirement for effective area of satellite can be satisfied when the number of nesting layers is 45. However, when the number of nesting layers further increase, the effective area will be improved with a low speed, but the weight of telescope will increase with a high speed. The field of view of this telescope is 16', which is more than the required value of 12'. Finally, the X-ray focusing telescope with 5.25 m focal length, 45 nesting layers, effective area 842 cm~2 at 2 keV, 563 cm~2 at 6 keV is obtained.
来源	物理学报 ,2019,68(16):160702 【核心库】
DOI	10.7498/aps.68.20190709
关键词	X射线 ; 聚焦望远镜 ; 掠入射原理 ; 有效面积 ; 角分辨率
地址	1. 中国科学院西安光学精密机械研究所, 中国科学院瞬态光学与光子技术重点实验室, 西安, 710119 2. 中国科学院大学, 北京, 100049
语种	中文
文献类型	研究性论文
ISSN	1000-3290
学科	机械、仪表工业
基金	国家自然科学基金 ; 空间科学先导专项
文献收藏号	CSCD:6566861

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1 孙世峰基于可分离编码的高分辨X射线荧光成像技术研究物理学报,2020,69(19):198701
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