MRI: Acquisition of a Top-Loading Refrigerator and Magnet System for Studies of Quantum Systems and Undergraduate Research

将购买一个顶装式稀释冰箱和磁铁系统，作为四个研究小组之间的共享设施。该系统将提供极低温度(15MK或更低)和高磁场(高达10T)的组合环境。它将允许相对快速和简单的样本更换，这将促进研究小组之间共享设备，并使使用该系统的本科生参与研究项目成为可能。冰箱/磁体系统将用于研究低温下的各种量子现象：纳米器件(交叉安德列夫反射器件和纳米线阵列)、分子磁体的纠缠态、鱿鱼中的宏观量子现象、量子流体薄膜中的奇异态、量子流体的自旋动力学，以及用于磁共振成像的超极化造影剂的低温生产。更广泛的影响将包括为本科生打开低温研究的新领域，为未来的纳米级、量子信息和超极化核磁共振技术奠定科学基础。将获得一种专门的冰箱和磁体系统，这将使样品能够冷却到绝对零度以下的千分之十五度，同时使它们受到极大的磁场(最高可达10特斯拉，约为地球磁场的20万倍)。四个研究小组将共享这个系统，并用它来研究低温下的量子现象。要研究的领域将包括纳米器件、潜在用于量子计算的现象，以及其他奇异的量子系统。该冰箱/磁体系统的一个特殊功能是能够快速、轻松地更换样品，而无需拆卸整个系统。这将使本科生能够使用冰箱进行研究，为本科生的物理教学和研究开辟了新的物理领域。

A top-loading dilution refrigerator and magnet system will be acquired to serve as a shared facility between four research groups. This system will provide a combined environment of extremely low temperatures (15 mK or less) and high magnetic fields (up to 10 T). It will permit relatively rapid and uncomplicated sample changes, which will facilitate sharing the facility between the research groups and will make it possible to engage undergraduates in research projects using this system. The refrigerator/magnet system will be used to study a variety of quantum phenomena at low temperature: nanoscale devices (crossed Andreev reflection devices and nanowire arrays), entangled states of molecular magnets, macroscopic quantum phenomena in SQUIDS, exotic states in quantum-fluid films, spin dynamics of quantum fluids, and cryogenic production of hyperpolarized contrast agents for MRI. Broader impacts will include opening new areas of low-temperature research to participation by undergraduates, and laying the scientific groundwork for future nanoscale, quantum-information, and hyperpolarized MRI technologies.A specialized refrigerator and magnet system will be acquired, which will make it possible to cool samples to within fifteen thousandths of a degree from absolute zero temperature while subjecting them to extremely large magnetic fields (up to ten tesla, or about 200,000 times larger than the Earth's field). Four research groups will share this system and use it to study quantum phenomena at low temperature. The areas to be studied will include nano devices, phenomena of potential use for quantum computing, and other exotic quantum systems. A special feature of this refrigerator/magnet system is the ability to quickly and easily change samples without disassembling the entire system. This will make it possible to engage undergraduate students in research using the refrigerator, opening up new areas of physics to undergraduate physics instruction and research.