Upgrading and Refurbishing of the "Multi-1" Mass Spectrometer at the University of Michigan

密歇根大学“Multi-1”质谱仪的升级和翻新

• 批准号: 9909598
• 负责人: Samuel Mukasa
• 金额: $ 11.78万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-04-01 至 2002-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9909598&HistoricalAwards=false
• 关键词: Upgrading; Refurbishing; Multi; Mass; Spectrometer

9909598MukasaThis proposal requests funds from the National Science Foundation to upgrade and refurbish one of the VG Sector thermal ionization mass spectrometers that has been in service at the University of Michigan since 1987. The workhorse of two radiogenic isotope research groups in the Department of Geological Sciences for over a decade, this mass spectrometer has the "Multi-1" collector block with six old-design, short-life Faraday cups that are moved manually. Because of their advanced age and throughput, the Faraday detectors have suffered some damage leading to degradation in gain and peak shape. The net result of this wear and tear is poor precision and reproducibility in the measurements of Sr and Nd isotopic ratios. In addition, electronic components in the instrument have aged and are beginning to impose disruptive downtimes. Most critical of these are the Solatron digital voltmeters (DVM's), which are known to become temperamental with age and have been the source of frustrations in many other isotope labs. Solatron DVM's are no longer manufactured, and therefore finding adequate parts to fix them has become a problem. In order to lengthen the service of this mass spectrometer, the Faraday detectors, the Daly detector and the DVM's need to be replaced by their more modern equivalents, which have superior performance in stability, sensitivity and durability. Modest funds are also requested to purchase a filament outgasser for this mass spectrometer. The mass spectrometer and its periphery equipment are critically important to the research of several faculty members, postdoctoral fellows and graduate students as detailed in the proposal.***

9909598Mukasa此提案请求国家科学基金会提供资金来升级和翻新一台 VG Sector 热电离质谱仪，该质谱仪自 1987 年以来一直在密歇根大学使用。十多年来，该质谱仪一直是地质科学系两个放射性同位素研究小组的主力，该质谱仪具有“Multi-1”收集器块，其中有六个旧设计， 手动移动的短寿命法拉第杯。由于其老化和吞吐量高，法拉第探测器遭受了一些损坏，导致增益和峰形下降。这种磨损的最终结果是 Sr 和 Nd 同位素比测量的精度和再现性较差。此外，仪器中的电子元件已经老化，并开始造成破坏性停机。 其中最关键的是 Solatron 数字电压表 (DVM)，众所周知，它会随着年龄的增长而变得不稳定，并且一直是许多其他同位素实验室感到沮丧的根源。 Solatron DVM 已不再生产，因此寻找足够的零件来修复它们已成为一个问题。为了延长该质谱仪的使用寿命，法拉第探测器、达利探测器和 DVM 需要更换为更现代的同类产品，这些产品在稳定性、灵敏度和耐用性方面具有卓越的性能。 还需要适度的资金来购买该质谱仪的灯丝除气器。 质谱仪及其外围设备对于几位教职员工、博士后研究员和研究生的研究至关重要，如提案中详细说明的。***