MICROXAS IMAGING SYSTEM FOR BL 6-2

本子项目是利用由NIH/NCRR资助的中心赠款提供的资源的众多研究子项目之一。子项目和研究者（PI）可能已经从另一个NIH来源获得了主要资金，因此可以在其他CRISP条目中表示。列出的机构是中心的，不一定是研究者的机构。去年，Xradia公司的商用Kirkpatrick-Baez （KB）镜像系统在BL6-2上进行了虚拟源配置。XAS成像的亚微米聚焦使用两个Rh涂层可调KB反射镜，在交叉几何中用于垂直和水平聚焦，每个反射镜都有一个独立的弯曲机构来设置所需的表面图形。光学元件被封闭在氦大气中，减少了吸收和散射。安装在第一个垂直聚焦KB反射镜下游的高精度狭缝孔径能够设置光学系统的拦截光束大小，并允许通过探测反射镜表面的不同区域和位置来交换聚焦通量的光斑大小。光束尺寸范围从2 × 3到15 × 11（轴向x轴向微米^2）已经实现。

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. A commercial Kirkpatrick-Baez (KB) mirror system from Xradia Inc. was commissioned on BL6-2 in a virtual source configuration last year. Sub-micrometer focusing for XAS imaging is obtained using two Rh coated adjustable KB mirrors in a crossed geometry for vertical and horizontal focusing, each with a self-contained bending mechanism to set the desired surface figure. The optics has been enclosed in a He atmosphere, reducing absorption and scatter. A high precision slit aperture mounted downstream of the first vertically focusing KB mirror enables setting the intercepted beam size of the optics, and allows trading focused flux for spot size by probing different areas and locations of the mirror surface. Beam sizes ranging from 2 x 3 to 15 x 11 (horz x vert micrometer^2) have been achieved at this point.