合肥光源平面光栅单色器设计及调试

发布时间：2018-02-14 07:14

本文关键词： 同步辐射光束线光栅单色器平面光栅准直型SX-700 自聚焦平面变间距 Czerny-Turner　出处：《中国科学技术大学》2017年博士论文　论文类型：学位论文

【摘要】：同步辐射装置是基础科学研究领域的重要研究工具,其中,光束线是连接实验站和光源的桥梁,需要把复色的同步辐射光处理成具有一定尺寸、一定发散角和一定能量分辨率的单色光。光束线的核心为单色器,在真空紫外-软X波段主要为光栅分光单色器,其中平面光栅单色器以其光学元件加工简单,适应范围广等受到广泛应用。本文工作依托于合肥光源进行的重大维修改造项目详细研究了平面光栅单色器的性能特点和关键技术,主要包括以下内容:1.详细研究了真空紫外-软X射线光束线最常用的两种平面光栅单色器(准直型SX-700平面光栅单色器和自聚焦平面变间距光栅单色器)的光学特点,总结了这两种单色器的特点和应用范围。研究发现影响两种单色器的主要因素一致,但自聚焦平面变间距光栅单色器由于光栅的像差校正功能使得其比准直型SX-700 平面光栅单色器少了两块反射镜,而反射镜会占据一定的空间,这就会导致相同条件下准直型SX-700平面光栅单色器入射臂和出射臂的长度相较自聚焦平面变间距光栅单色器更短,从而导致分辨率的降低。同时由于多了两块反射镜,也会导致效率的降低。因此,在光束线长度确定的情况下,自聚焦平面变间距光栅单色器的光谱分辨率和光学系统效率更好。但是,准直型SX-700平面光栅单色器可以通过选取不同的焦点常数而实现高通量模式、高次谐波抑制模式和高分辨运行模式,并能通过调节焦点常数以改变出射狭缝处的相空间,这是其最大的优点。这些研究具有创新性,并能为同类光束线的设计提供了基础。2.合肥光源重大维修改造项目中的软X成像光束线的设计工作。新建的软X成像光束线站性能较原来有较大提升。软X成像光束线从扭摆器中引出,覆盖能量范围200～2500 eV。光束线采用准直型SX-700平面光栅单色器,使用线密度分别为760 1/mm和1400 1/mm的平面光栅覆盖整个能量范围。光束线主要性能指标:光子通量大于1×1012phs/s@300mA;能量分辨优于500 @ 520eV;出射狭缝处发散角为2.6 mrad(H)× 2.8 mrad(V)。3.合肥光源重大维修改造项目中的燃烧光束线的设计工作。燃烧光束线的性能较原来的光束线有了全面的升级,极大地拓展了同步辐射在燃烧领域的应用。燃烧光束线从波荡器中引出,覆盖能量范围4.8～20 eV。光束线采用掠入射Czerny-Turner型平面光栅单色器,使用线密度分别为2001/mm和4001/mm的平面光栅覆盖整个能量范围。光束线的主要性能指标为:光子通量5×1012phs/s@300 mA:能量分辨优于3000 @15.8 eV。4.详细介绍了合肥光源重大维修改造项目中新建三条光束线,软X成像光束线(准直型SX-700平面光栅单色器)、燃烧光束线(掠入射Czerny-Turner型平面光栅单色器)和催化与表面科学光束线(自聚焦平面变间距光栅单色器)的安装调试工作以及平面光栅单色器的相关技术(包括光学元件的检测、精密狭缝、精密导轨的测试以及单色器的能量标定)的研究。最后对燃烧光束线和催化与表面科学光束线的性能进行了详细测试,测试结果显示光束线的性能指标满足设计要求。其中催化与表面科学光束线的实际运行的分辨本领优于10000@29.2 eV.性能达到国际同类装置先进水平。
[Abstract]:Synchrotron radiation is an important research tool of basic science research in the field of the beam line is a bridge connecting the experimental station and the light source, the need to re color synchrotron radiation light processing into a certain size, a certain divergence angle and the energy resolution of monochromatic light. Core beam line for monochromator in the vacuum ultraviolet and soft X band is mainly grating monochromator, the plane grating monochromator with its simple optical components processing, to adapt to a wide range has been widely used. The performance characteristics and key technologies are studied in detail in this paper based on plane grating monochromator major maintenance and reconstruction project in Hefei light source, mainly includes the following contents: 1. a detailed study of vacuum ultraviolet - two kinds of soft X ray beam line plane grating monochromator (the most common type of SX-700 collimation plane grating monochromator and self focusing planar variable spacing grating monochromator) light The characteristics, summarizes the characteristics and application scope of the two monochromator. The study found that the main factors affecting the two monochromator, but self focusing planar variable spacing grating monochromator due to its less than two reflectors collimation SX-700 plane grating monochromator grating aberration correction, and the mirror will occupy a certain space this will lead to the same conditions, the collimating type SX-700 plane grating monochromator exit incident arm and arm length compared with the self focusing planar variable spacing grating monochromator is shorter, resulting in lower resolution. At the same time because of the two mirrors, will also reduce the efficiency. Therefore, the length of the beam line in case the spectral resolution of optical system and better efficiency of self focusing planar variable spacing grating monochromator. However, alignment of SX-700 plane grating monochromator can be selected by different focal point often The number of modes to achieve a high throughput, high harmonic suppression and high resolution mode of operation mode, and can be adjusted to change the focus of constant phase space of the exit slit, this is the biggest advantage. The research is innovative design work provides a line of soft X based.2. imaging beam in Hefei light source in the major maintenance and reconstruction project the design and for the same beam line. Soft X imaging beamline is larger than the original performance of the new upgrade. Soft X imaging beam line drawn from the wiggler, covering the energy range of 200~2500 eV. beam line collimation of SX-700 plane grating monochromator, using linear density were 760 1/mm and 1400 plane grating 1/mm cover the whole energy range. The main performance indexes of beam line: the photon flux is greater than 1 * 1012phs/s@300mA; energy resolution is better than 500 @ 520eV; the exit slit at the divergence angle of 2.6 * 2.8 mrad (H) mrad (V).3. Design of combustion beam line source fertilizer major maintenance and reconstruction project. The combustion performance of beam line beam line than the original with a comprehensive upgrade, greatly expand the application of synchrotron radiation in combustion field. The combustion beam line drawn from the undulator, covering the energy range of 4.8 ~ 20 eV. beam line by grazing incidence Czerny-Turner type plane grating monochromator, using linear density were 2001/mm and 4001/mm plane grating covering the whole energy range. The main performance indexes of beam line for the photon flux of 5 * 1012phs/s@300 mA: energy resolution is better than 3000 @15.8 eV.4. introduced three new beam line of Hefei light source major maintenance project, soft imaging beamline (X alignment of SX-700 plane grating monochromator beamline (combustion), grazing incident Czerny-Turner plane grating monochromator) and catalysis and surface science beamline (self focusing plane Variable spacing grating monochromator) installation work and the related technology of plane grating monochromator (including optical element detection, precision slit, precision guide testing and calibration of the monochromator energy). The combustion performance of the beam and the catalysis and surface science beam line with test, test results show that the performance index the beam line meets the design requirements. The actual operation of catalysis and surface science beamline of the resolution is better than 10000@29.2 eV. performance reached the international advanced level of similar devices.

【学位授予单位】：中国科学技术大学
【学位级别】：博士
【学位授予年份】：2017
【分类号】：TH74

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