MRI: Acquisition of a Cryogen-free dilution refrigerator with a 12 T magnet

MRI：购买带有 12 T 磁铁的无冷冻剂稀释冰箱

• 批准号: 1126061
• 负责人: Mansour Shayegan
• 金额: $ 43.6万
• 依托单位: Princeton University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-10-01 至 2015-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1126061&HistoricalAwards=false
• 关键词: MRI; Acquisition; Cryogen; free; dilution

AbstractIntellectual Merit -- The goal of this project is to acquire and set up a cryogen-free dilution refrigerator with a base temperature of about 0.010 Kelvin and a superconducting magnet with a maximum field of 12 Tesla. This equipment will be shared by eight Principal Investigators and collaborators, and will be used by their graduate and undergraduate students, post-docs and research staff. It will be initially devoted to measurements of electronic properties of low-dimensional semiconductor structures, topological insulators, and graphene. All these material systems are at the forefront of current, fundamental solid state physics and device research. They also have potential transformative applications, e.g., in quantum computing and information processing. The cryogen-free system will enhance the research on these materials in several crucial ways: (1) It will allow measurements at low temperatures and in tilted magnetic fields to learn exciting new physics. (2) Because the operation of the proposed equipment is much simpler than the conventional dilution refrigerators, it will tremendously enhance the efficiency of the measurements and research progress. (3) It will allow the inclusion of undergraduate students in research projects more easily. (4) It will replace our existing equipment which is instrumental to our research but is over 20 years old, has frequent problems, and does not reach below about 0.03 Kelvin. (5) Each year it will save over $100,000 worth of materials (liquid Helium) cost. This will have a huge impact on the ability to make measurements and produce new results more efficiently. (6) It will save Helium, a precious noble gas.Broader Impacts -- The impact of the proposed project will be seen in the scientific community and beyond. Results of the research will be communicated through publications and conference presentations to the specialized as well as general science and engineering communities. While the subject of this project is fundamental, progress in this area will benefit society in the long term as it may lead to novel, transformative concepts for electronic materials and devices and information processing systems whose operation relies on quantum and/or interaction phenomena. The project incorporates a high quality and comprehensive educational component. The PIs are dedicated to the education of both graduate and undergraduate students. They all have typically small groups (4 to 6) of students, and their belief is that doing good quality research, with close supervision, is the best way to teach beyond textbooks and problem sets. The project will therefore result in the education of students in critical, state-of-the art areas of science and technology, including the fabrication, characterization, and physics of high quality layered semiconductor structures and other novel materials such as topological insulators and graphene. Well-trained students in these fields will be invaluable resources for the US as well as for the rest of the world. The PIs will also make every effort to attract to this project students from underrepresented groups.The PIs are committed to a broader education of the public in science and engineering. Some of the topics and results of this project will be incorporated into undergraduate and graduate courses that they teach at Princeton University. The PIs will also participate in various K-12 demonstrations and teacher training programs in electricity and magnetism and in cryogenic temperatures, general areas that are closely linked to the topic of this proposal. These activities include training sessions, kit development, and demonstrations at regional schools and at Princeton University.

【摘要】知识价值：本课题的目标是获得并建立一个基温约为0.010开尔文的无低温稀释制冷机和一个最大磁场为12特斯拉的超导磁体。该设备将由8位首席研究员和合作者共享，并将由他们的研究生和本科生、博士后和研究人员使用。它最初将致力于测量低维半导体结构、拓扑绝缘体和石墨烯的电子特性。所有这些材料系统都处于当前基础固态物理和器件研究的前沿。它们还具有潜在的变革性应用，例如在量子计算和信息处理方面。无低温系统将在几个关键方面加强对这些材料的研究：(1)它将允许在低温和倾斜磁场下进行测量，以了解令人兴奋的新物理学。(2)由于所提出的设备的操作比传统的稀释制冷机简单得多，它将极大地提高测量效率和研究进展。(3)更容易将本科生纳入研究项目。(4)它将取代我们现有的设备，这些设备对我们的研究有帮助，但已经超过20年，经常出现问题，并且温度不低于0.03开尔文左右。(5)每年可节省价值10万美元以上的材料（液氦）成本。这将对更有效地进行测量和产生新结果的能力产生巨大影响。(6)它将节省氦，一种珍贵的惰性气体。更广泛的影响——拟议项目的影响将在科学界和其他领域看到。研究结果将通过出版物和会议报告传达给专业以及一般科学和工程社区。虽然这个项目的主题是基础性的，但从长远来看，这一领域的进展将有益于社会，因为它可能会为电子材料和设备以及依赖量子和/或相互作用现象的信息处理系统带来新颖的、变革性的概念。该项目包含高质量和全面的教育组成部分。pi致力于研究生和本科生的教育。他们都有典型的小团体（4到6名学生），他们的信念是，在密切监督下进行高质量的研究，是超越教科书和习题的最佳教学方式。因此，该项目将为学生提供关键的、最先进的科学技术领域的教育，包括高质量层状半导体结构和其他新型材料（如拓扑绝缘体和石墨烯）的制造、表征和物理。在这些领域训练有素的学生将是美国和世界其他地区的宝贵资源。学院还将尽一切努力吸引代表性不足群体的学生参加这个项目。pi致力于为公众提供更广泛的科学和工程教育。这个项目的一些主题和结果将被纳入他们在普林斯顿大学教授的本科和研究生课程。pi还将参加各种K-12示范和教师培训计划，包括电、磁和低温，这些领域与本提案的主题密切相关。这些活动包括在地区学校和普林斯顿大学的培训会议、工具包开发和演示。