OPERATIONAL STATUS OF THE 24-ID-C BEAMLINE

该子项目是利用NIH/NCRR资助的中心赠款提供的资源的许多研究子项目之一。子项目和研究者（PI）可能从另一个NIH来源获得主要资金，因此可以在其他CRISP条目中表示。所列机构为中心，不一定是研究者所在机构。去年在24-ID-C插入光束线的活动集中在：1。晶体学调试<$测试表征良好的晶体（溶菌酶、索马甜等）来微调光束线并优化它以获得最高质量的晶体学数据。 2.通过添加新的软件和硬件功能，进一步增强光束线光学和控制组件。 3.过渡到全职用户数据采集在晶体学调试期间对光束线进行的诊断测试已经证明了24-ID-C光束线能够从具有低R合并因子（对于1. 4 <$分辨率，约为0. 04）的良好衍射晶体中产生高质量的晶体学数据。额外的测试已经证明，对于小至100 msec的曝光时间，数据质量没有恶化。在7000-9000 eV范围内的低能量数据收集也显示了通过采用来自硫原子的弱异常信号来求解结构的可行性，重申了从24-ID-C束线可获得的高质量数据。

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. The last year's activities at the 24-ID-C insertion beamline have focused upon: 1. Crystallographic commissioning ¿ testing well characterized crystals (lysozyme, thaumatin, etc.) to fine tune the beam line and to optimize it to get the highest quality crystallographic data. 2. Further enhancement of the beamline optical and control components with the addition of new software and hardware capabilities. 3. Transition to full-time user data collection Diagnostic testing of the beamline during crystallographic commissioning has proven the capability of the 24-ID-C beam line in producing high quality crystallographic data from well diffracting crystals with low R-merge factor (~0.04 for 1.4 ¿ resolution). Additional tests have demonstrated no deterioration in data quality for exposure times as small as 100 msec. Low-energy data collection in the range of 7000-9000 eV has also shown the feasibility of solving structures by employing weak anomalous signal from sulphur atoms, reiterating the high quality of data obtainable from the 24-ID-C beam line.