Enhancement of a Synchrotron Beamline for Magnetics Research and Education

这笔赠款支持用于磁学研究和教育的同步加速器光束线的增强。新一代自旋电子材料的开发正在进行，需要有针对性的设施来表征磁性与电子和物理结构之间的关系。这笔赠款通过利用对路易斯安那州立大学CAMD同步加速器光源现有光束线的大量投资来满足这一需求。此次升级将改进磁性材料的表征，使用跨越3D过渡金属L边的能量的圆偏振光。此次升级包括两套改进。首先，目前的平面光栅单色仪光束线将得到增强，以允许使用可调谐的圆偏振同步加速器光。将建造步进电机控制的冷却挡板，从轨道的上部和下部提取圆偏振光。光束线被设计成可容纳两个栅格，并将安装一个新的300-1200 eV栅格，以扩大当前的光子能量范围。最后，三次反射偏振器将安装在光束线上最后一个光学元件的后面，以测量光的偏振度。第二个部件是提供样品制备的通用用户终端、用于原位薄膜生长的蒸发器和用于磁化样品的线圈。光谱学将包括总产额测量和光电发射，并包括目前的LEED和RHEED仪器。这一改进将利用对来自路易斯安那州、内布拉斯加州、阿拉巴马州NSF-MINT中心和伊利诺伊州的一批磁性材料研究人员的投资，并提供一种简单但可靠的方法来表征广泛的磁性材料。这个光源位于该国服务不足的地区，其位置提供的访问服务于研究的需要

This grant supports enhancement of a synchrotron beamline for magnetics research and education. Development of a new generation of spintronic materials is occurring and there is a need for facilities targeted to characterize the relationship between magnetic properties and electronic and physical structures. This grant addresses this need by leveraging a significant investment in the existing beamline at the LSU CAMD synchrotron light source. The upgrade will provide for improved characterization of magnetic materials using circularly polarized light at energies spanning the L-edges of 3d transition metals. The upgrade consists of two sets of improvements. First, the current plane-grating monochromator beamline will be enhanced to allow for the use of tunable, circularly polarized synchrotron light. Stepper-motor controlled, cooled baffles will be constructed to extract circularly polarized light from the upper and lower portions of the orbit. The beamline was designed to accommodate two gratings, and a new, 300 - 1200 eV, grating will be installed to extend the current photon energy range. Finally, a triple-reflection polarizer will be installed beyond the last optical element in the beamline to measure the degree of light polarization. A second component is a general-purpose user-endstation to provide for sample preparation, evaporators for in-situ film growth, and coils for magnetizing samples. Spectroscopy will include total yield measurements as well as photoemission and provide for inclusion of current LEED and RHEED instrumentation. This enhancement will leverage investments in a group of magnetic materials researchers from Louisiana, Nebraska, Alabama's NSF-MINT Center, and Illinois and provide for a simple but reliable method to characterize a broad range of magnetic materials. The access provided by the location of this light source, located in an underserved region of the country, serves the needs of researche