SYNCHROTRON CRYSTALLOGRAPHY BEAMLINE X9A STRUCTURE FUNCTION STUDIES

同步加速器晶体学光束线 X9A 结构功能研究

• 批准号: 6205789
• 负责人: STEVE ALMO
• 金额: --
• 依托单位: ALBERT EINSTEIN COLLEGE OF MEDICINE
• 依托单位国家: 美国
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-09-01 至 2000-08-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/6205789
• 关键词: biomedical resource; building /facility design /renovation; enzymes; lipids; nucleic acids; proteins; spectrometry; synchrotrons; technology /technique

The NSLS, in collaboration with SPring-8, Japan, has designed, built and tested a prototype small-gap undulator, whose compactness allows it to reside between the rf cavities that exist at X9 and X29. This prototype in-vacuum undulator (IVUN), with a period of 11 mm, a minimum useful gap of 3.3 mm (maximum of 10 mm) and a magnetic field of 0.678 T is currently installed in the straight section for beamline X13. These parameters lead to a measured fundamental at 4.6 keV, second harmonic at 8.7 keV, and a third harmonic at 13.9 keV. The brightness of IVUN is comparable (slightly higher) than the X25 wiggler. Since its brightness is significantly less than that of the APS devices, the corollary is that the spectral width is greater, in fact sufficient to perform a MAD experiment around selected absorption edges if the peak energy is carefully selected. The X13 undulator will provide the basis for the design and construction of a completely dedicated small-gap undulator station for MAD data collection at the Se edge at NSLS. The availability of such a facility will greatly increase the total number of MAD days available to the scientific community and will serve as a model for the further development and implementation of small-gap undulators as major resources in structural, molecular and cellular biology.

NSLS 与日本 SPring-8 合作设计了： 建造并测试了一个原型小间隙波荡器，其紧凑性 允许它驻留在 X9 和 X29 处的射频腔之间。 该原型真空波荡器 (IVUN) 的周期为 11 毫米， 最小有效间隙 3.3 毫米（最大 10 毫米）和磁场 0.678 T 目前安装在光束线的直线部分 X13。 这些参数导致测得的基波为 4.6 keV， 二次谐波为 8.7 keV，三次谐波为 13.9 keV。 这 IVUN 的亮度与 X25 相当（略高） 摇摆者。 由于其亮度明显低于 APS 器件的必然结果是光谱宽度更大，在 事实足以围绕选定的吸收进行 MAD 实验 如果仔细选择峰值能量。 X13 波荡器 将为完整的设计和施工提供基础 用于 MAD 数据采集的专用小间隙波荡器站 NSLS 的 Se 边缘。 这种设施的可用性将极大地 增加科学界可用的 MAD 天总数 社区，并将成为进一步发展的典范 实施小间隙波动器作为主要资源 结构、分子和细胞生物学。