MRI: Track 3 Acquisition of Helium Recovery Equipment to Enhance Research and Training in Earth Sciences and Chemistry

该主要研究仪器（MRI）奖将为明尼苏达大学（UMN）的两个广泛使用的多用户研究中心提供资金，用于氦气回收和无低温操作设备：地球与环境科学学院的岩石磁学研究所（IRM）和化学系的核磁共振（NMR）实验室。该设备将使这些设施更有弹性地应对氦气短缺、配给和供应中断（以及相关的成本影响）。因此，这些行动将最大限度地不间断地使用仪器，扩大实验室的科学产出，并使许多nsf资助的项目受益，并提高两个重点研究中心的可持续性和弹性。这些实验室的测量对于表征和理解地质、生物、行星和新型合成材料的磁性至关重要，这些材料与广泛的科学问题有关。氦气是一种有限的资源，必须进行适当的管理，包括氦气回收和无低温功能。对不可再生的冷冻剂的依赖使得两个实验室都很容易出现短缺，同时也增加了年度运营成本。国际原子能机构和核磁共振实验室正处于一个关键时刻，氦短缺和相关的供应配额已经减少了业务，并对计划活动造成越来越大的不确定性。持续的短缺严重限制了我们为更广泛的科学界服务和推进前沿研究的能力。新设备将减少或消除我们设施中关键设备对LHe的需求。这将使这些设施能够不间断地最大限度地利用其仪器，进一步扩大实验室的科学产出，使许多国家科学基金会资助的项目受益，并提高两个重点研究中心的可持续性和弹性。这两个设施都依赖于液氦（LHe）的不间断供应，用于超导磁体、超导量子干涉装置（SQUID）磁力计和变温57Fe Mössbauer光谱仪的操作，这些测量对于表征和理解地质、生物、行星和新型合成材料的磁性至关重要。天然材料、它们的合成类似物和新型材料的低温（2-300 K）磁性对于理解广泛的科学问题是必不可少的，低温测量提供了通过任何其他方法无法获得的观察结果。核磁共振波谱是最强大的技术，可用于阐明分子结构。它的许多用途包括确定分子内原子的排列和表征溶液中分子相互作用的动力学。保持LHe设备的功能对于以下操作至关重要：(1)IRM作为NSF国内和国际研究人员的多用户设施；(2)核磁共振实验室作为UMN研究和教学的共享仪器设施。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

This Major Research Instrumentation (MRI) award will provide funds to acquire equipment for helium gas recovery and cryogen-free operations for two widely used multi-user research centers at the University of Minnesota (UMN): The Institute for Rock Magnetism (IRM) in the School of Earth and Environmental Sciences and the Nuclear Magnetic Resonance (NMR) Laboratory in the Department of Chemistry. This equipment will make these facilities more resilient against helium shortages, rationing, and supply disruptions (and the associated impacts on cost). As a result, these actions will maximize the use of instrumentation without interruption and expand the laboratories’ scientific output, as well as benefiting numerous NSF-funded projects, and improving the sustainability and resilience of two key research centers. Measurements in these laboratories are crucial for characterizing and understanding the magnetic properties of geological, biological, planetary, and novel synthetic materials related to a broad range of scientific questions. Helium is a finite resource and it is imperative that proper stewardship, including helium gas recovery and cryogen-free functionality become commonplace. The dependence on non-renewable cryogens has made both laboratories vulnerable to shortages, as well as increasing annual operating costs. The IRM and NMR Laboratory are at a critical juncture where helium shortages and associated supply quotas have already reduced operations and pose increasing uncertainty on scheduled activities. The ongoing shortage has severely limited our ability to serve the broader scientific community and advance cutting-edge research. The new equipment will reduce or eliminate the need for LHe for critical equipment in our facilities. This will allow the facilities to maximize the use of its instruments without interruption, further expanding the laboratories’ scientific output, benefit numerous NSF funded projects, and improve the sustainability and resilience of two key research centers. Both facilities are dependent on uninterrupted supplies of liquid Helium (LHe) for the operations of superconducting magnets, superconducting quantum interference device (SQUID) magnetometers, and variable temperature 57Fe Mössbauer spectrometers for measurements that are crucial for characterizing and understanding the magnetic properties of geological, biological, planetary, and novel synthetic materials. The low-temperature (2-300 K) magnetic properties of natural materials, their synthetic analogues, and novel materials are indispensable for understanding a broad range of scientific questions, with low-temperature measurements providing observations not obtainable through any other methods. NMR spectroscopy is the most powerful technique available for the elucidation of molecular structures. Its many uses include determining the arrangement of atoms within molecules and characterizing the dynamics of molecular interactions in solution. Preserving the functionality of LHe equipment is essential to the operation of (1) the IRM as an NSF multi-user facility for national and international researchers; and (2) the NMR Laboratory as a shared-use instrumentation facility for research and teaching at the UMN.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.