Collaborative Research:AMS Ion Source Development at University of California, Irvine, Woods Hole Oceanographic Institution, University of Arizona, and National Electrostatics Corp

合作研究：加州大学欧文分校、伍兹霍尔海洋研究所、亚利桑那大学和国家静电公司的 AMS 离子源开发

• 批准号: 0324752
• 负责人: Mark Roberts
• 金额: $ 3.63万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-08-15 至 2006-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0324752&HistoricalAwards=false
• 关键词: Collaborative; Research; AMS; Ion; Source

EAR-0324752RobertsLaboratories at University of California at Irvine, Woods Hole Oceanographic Institution, and University of Arizona use accelerator mass spectrometry (AMS) to measure cosmogenic isotopes, primarily 14C, supporting research at the parent institutions plus numerous external researchers. The demand for these analyses comes from many scientific fields, including: geology, archaeology, physics, geography, oceanography, atmospheric sciences, hydrology, biology, art history, forensic sciences and engineering. A reliable and stable ion source for converting samples of interest into intense beams of negative ions is absolutely critical to the overall performance of an AMS spectrometer. The three AMS laboratories collaborating in this proposal currently use four versions of the MC-SNICS Cs sputter ion source, built by National Electrostatics Corp (NEC) of Middleton, WI. We will collaborate with NEC in a 2-year program to modify the ion source for increased output, better reliability, and improved serviceability. Low source output, poor reliability, and time required for source maintenance are currently the largest causes of delay and poor measurement quality for users of AMS laboratories worldwide. Work at UC Irvine will concentrate on changes to the Cs feed and to the Cs and negative ion geometries aimed at increasing output and improving reliability. Woods Hole will investigate active pumping of the source and other vacuum improvements for increased output, and will redesign the ion source extraction region for improved reliability. Arizona will implement improved internal mounting arrangements for the Cs ionizer assembly and focusing electrodes, plus changes to sample alignment procedures leading to reduced servicing down time. A full suite of the modifications initially developed at each laboratory will then be evaluated, and an optimal set will be incorporated in the sources at the three institutions and in new sources produced by NEC. The results will be passed on to the AMS community at large, to allow the many disciplines using AMS to reap the scientific benefits resulting from improved measurement quality due to better source performance.

EAR-0324752ROBERTSLABORATORIES的欧文分校，伍兹霍尔海洋学机构和亚利桑那大学使用加速器质谱法（AMS）来衡量宇宙同位素，主要是14C，主要是在父母机构和众多外部研究人员的支持。对这些分析的需求来自许多科学领域，包括：地质，考古学，物理学，地理，海洋学，大气科学，水文学，生物学，艺术史，法医学和工程学。 可靠且稳定的离子源将感兴趣的样品转换为负离子的强束对于AMS光谱仪的整体性能至关重要。目前，在该提案中合作的三个AMS实验室使用了由威斯康星州米德尔顿的国家电气静电公司（NEC）建造的四个版本的MC-SNICS Sputter Ion Source。 我们将与NEC合作为期2年的计划，以修改离子源以提高产出，更好的可靠性和提高的可服务性。目前，对于全球AMS实验室用户来说，源数量低，可靠性差和源维护所需的时间是延迟和测量质量差的最大原因。 UC Irvine的工作将集中于CS Feed以及CS和负离子几何形状的更改，旨在提高产出和提高可靠性。 伍兹孔将研究源和其他真空改进的主动泵送以增加产出，并将重新设计离子源提取区以提高可靠性。 亚利桑那州将针对CS电离器组件和聚焦电极实施改进的内部安装安排，并更改样品对齐程序，从而减少维修时间。 然后，将评估最初在每个实验室开发的整个修改套件，并将在三个机构的来源和NEC生产的新来源中纳入最佳集合。结果将传递给整个AMS社区，以允许许多学科使用AMS通过更好的源效果而获得的测量质量提高而获得的科学收益。