Cutler Grant, Cocco Daniele, DiMasi Elaine, Morton Simon, Sanchez Del Rio Manuel, Padmore Howard
Lawrence Berkeley National Laboratory, 1 Cyclotron Rd, Berkeley, CA 94720, USA.
J Synchrotron Radiat. 2020 Sep 1;27(Pt 5):1131-1140. doi: 10.1107/S1600577520008930. Epub 2020 Aug 11.
This paper presents a novel cantilevered liquid-nitrogen-cooled silicon mirror design for the first optic in a new soft X-ray beamline that is being developed as part of the Advanced Light Source Upgrade (ALS-U) (Lawrence Berkeley National Laboratory, USA). The beamline is optimized for photon energies between 400 and 1400 eV with full polarization control. Calculations indicate that, without correction, this design will achieve a Strehl ratio greater than 0.85 for the entire energy and polarization ranges of the beamline. With a correction achieved by moving the focus 7.5 mm upstream, the minimum Strehl ratio is 0.99. This design is currently the baseline plan for all new ALS-U insertion device beamlines.
本文介绍了一种新型悬臂式液氮冷却硅镜设计，用于美国劳伦斯伯克利国家实验室先进光源升级项目（ALS-U）中正在开发的一条新软X射线光束线的第一光学元件。该光束线针对400至1400 eV的光子能量进行了优化，并具备全偏振控制。计算表明，未经校正时，该设计在光束线的整个能量和偏振范围内将实现大于0.85的斯特列尔比。通过将焦点向上游移动7.5 mm进行校正后，最小斯特列尔比为0.99。该设计目前是所有新的ALS-U插入式设备光束线的基线方案。
