COMMISSIONING OF THE INTEGRATED ULTRA SMALL ANGLE X-RAY SCATTERING SETUP

这个子项目是利用由NIH/NCRR资助的中心拨款提供的资源的许多研究子项目之一。子项目和调查员(PI)可能从另一个NIH来源获得了主要资金，因此可能会出现在其他CRISE条目中。列出的机构是针对中心的，而不一定是针对调查员的机构。今年，我们成功启用了最新集成的Bonse-Hart几何超小角X射线散射(USAXS)装置。在美国晶体协会年会上的口头陈述中报告了表征结果。USAXS的设置提供了与我们在前几年使用独立的USAXS设置所获得的特征非常接近的特征：在束峰值强度220微弧度的10-4处的全宽(以前为66)；小角分辨率1微米(以前为4微米)。我们相信，光学元件对准的进一步优化将使这些值进一步接近以前的值。典型的USAXS扫描需要几分钟，我们与针孔相机有足够的角度重叠，这是通过独立设置实现的。我们正在将USAXS扫描控制从基于VMS的实验控制程序Super转移到Linux上的Blu-ICE，以改进与针孔相机设置的集成。对雪崩光电二极管的放大电路进行了改进，提高了USAXS探测系统的可靠性。

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. We have successfully commissioned the newly integrated Bonse-Hart geometry ultra small angle x-ray scattering (USAXS) setup this year. The characterization results were reported in an oral presentation at the annual meeting of the American Crystallographic Association meeting. The USAXS setup delivered the characteristics closely comparable to those we had obtained in previous years with the stand-alone USAXS setup: full-width at 10-4 of the beam peak intensity 220 micro-radians (previously 66); small angle resolution 1 micrometer (previously 4 micrometer). We believe further optimization of optics component alignment will bring these values further closer to previous values. A typical USAXS scan takes several minutes and we have sufficient angular overlap with the pin-hole camera as had been achieved by the stand-alone setup. We are in the process of transferring the USAXS scan control from Super, a VMS-based experiment control program, to Blu-ICE on Linux for improved integration with the pinhole camera setup. We also modified the amplifier electronics of the avalanche photodiode, and this improved the reliability of the USAXS detection system.