国家同步辐射实验室波荡器光束线的光学设计。

Optical design of the NSRL undulator beamline.

作者信息

Zhang Y W, Sheng L S, Zhang G B, Gao H

机构信息

National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, People's Republic of China.

出版信息

J Synchrotron Radiat. 1998 May 1;5(Pt 3):559-61. doi: 10.1107/S0909049598000478.

DOI:10.1107/S0909049598000478

PMID:15263578

Abstract

The optical design of the NSRL undulator beamline is presented. The NSRL undulator has 29 periods of 9.2 cm that produce a photon energy of 7.7-124 eV with the fundamental and third harmonics at a ring energy of 800 MeV. The beamline consists of a typical Kirkpatrick-Baez prefocusing mirror system, a modified spherical-grating monochromator (SGM) and a refocusing toroidal mirror. The monochromator has two including angles of 148 and 157 degrees with two plane mirrors inserted into the entrance arm in order to cover the wide energy range with high grating diffraction efficiency. Calculation shows that the resolving power of the monochromator can be greater than 5000 with the slits fully opened and 20000 with a 20 micro m opening of the slits. The spot at the sample is about 1.5 (H) mm x 0.5 (V) mm.

摘要

介绍了NSRL波荡器光束线的光学设计。NSRL波荡器有29个周期，每个周期为9.2厘米，在800兆电子伏特的环能下，其基波和三次谐波产生的光子能量为7.7 - 124电子伏特。该光束线由一个典型的柯克帕特里克 - 贝兹预聚焦镜系统、一个改进型球面光栅单色仪（SGM）和一个再聚焦环形镜组成。该单色仪有两个包含角，分别为148度和157度，在入射臂中插入了两个平面镜，以便在高光栅衍射效率下覆盖较宽的能量范围。计算表明，当狭缝完全打开时，单色仪的分辨率可大于5000，当狭缝开口为20微米时，分辨率可达20000。样品处的光斑约为1.5（水平）毫米×0.5（垂直）毫米。