Development of a Tender-Energy Microspectroscopy and Imaging User Facility for Earth Sciences at NSLS and NSLS-II

NSLS 和 NSLS-II 地球科学招标能源显微光谱和成像用户设施的开发

• 批准号: 1128753
• 负责人: John Rakovan
• 金额: $ 0.1万
• 依托单位: Miami University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-04-01 至 2015-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1128753&HistoricalAwards=false
• 关键词: Development; Tender; Energy; Microspectroscopy; Imaging

This project will create a new, unique synchrotron-based user facility to examine geologic materials at the micron scale with a focused X-ray beam tuned specifically for lighter elements Na through Ti. This facility is designed and optimized for "tender" (1-8 keV energy) X-ray micro-spectroscopy and imaging applications for Earth Science research, and will complement existing and highly productive "hard" X-ray facilities operating above about 4.5 keV. It will extend to lower energies the X-ray fluorescence (XRF) and X-ray absorption spectroscopy (XAS) capabilities typical of hard X-ray microprobes, as element-specific non-invasive probes of elemental distribution and local physical and electronic structures and states in crystalline and non-crystalline materials. In addition, it will offer advanced capabilities for microbeam extended X-ray absorption spectroscopy (EXAFS) for determination of more detailed local structure around the selected element. This project will be undertaken by adding new micro-focusing capabilities at an established and proven macro-focused (~1mm spot size) tender-energy XAS beamline at X15B of the National Synchrotron Light Source (NSLS) at Brookhaven National Laboratory, and will subsequently transition to the new Tender Energy Spectroscopy (TES) beamline under development at NSLS-II. Its key attributes will be the distinct 1 to 8 keV energy range, user-tunable spot size from about 50 microns to 1 micron, high flux and stability optimized for high-quality and extended XAS, options for both XRF and XAS mapping with rapid scanning, and a helium glove-box sample environment. Performance will improve when transferred to NSLS-II, a state-of-the-art new Synchrotron designed for high brightness applications. These new capabilities are critical for advancing our knowledge of geochemical and biogeochemical processes, in particular those involving lighter elements, and will be openly available for use through the NSLS General User program. Specific applications targeted include the mineral-water interface, nutrients and contaminants, carbonates, paleoclimate, redox processes, high-pressure mineralogy; and health effects of Earth materials.

该项目将创建一个新的、独特的基于同步加速器的用户设施，通过专门针对轻元素 Na 到 Ti 调整的聚焦 X 射线束来检查微米级的地质材料。该设施专为地球科学研究的“温柔”（1-8 keV 能量）X 射线显微光谱和成像应用而设计和优化，并将补充现有的高产“硬”X 射线设施，其运行频率高于约 4.5 keV。它将把硬 X 射线微探针典型的 X 射线荧光 (XRF) 和 X 射线吸收光谱 (XAS) 功能扩展到较低能量，作为结晶和非结晶材料中元素分布以及局部物理和电子结构和状态的元素特异性非侵入式探针。此外，它将提供微束扩展 X 射线吸收光谱 (EXAFS) 的先进功能，用于确定所选元素周围更详细的局部结构。该项目将通过在布鲁克海文国家实验室国家同步加速器光源 (NSLS) X15B 上已建立且经过验证的宏观聚焦（~1mm 光斑尺寸）嫩能 XAS 光束线上添加新的微聚焦功能来进行，随后将过渡到 NSLS-II 正在开发的新嫩能光谱 (TES) 光束线。其关键属性包括独特的 1 至 8 keV 能量范围、用户可调节的光斑尺寸（约 50 微米至 1 微米）、针对高质量和扩展 XAS 进行优化的高通量和稳定性、具有快速扫描功能的 XRF 和 XAS 映射选项以及氦气手套箱样品环境。当转移到 NSLS-II（专为高亮度应用而设计的最先进的新型同步加速器）时，性能将得到改善。这些新功能对于提高我们对地球化学和生物地球化学过程的了解至关重要，特别是那些涉及轻元素的过程，并将通过 NSLS 普通用户计划公开使用。具体目标应用包括矿泉水界面、营养物和污染物、碳酸盐、古气候、氧化还原过程、高压矿物学；和地球材料的健康影响。