Acquisition of a Sorption-Pumped Dilution Refrigerator System to Investigate Quantum Transport in Nanostructures and for Student Training

购买吸附泵稀释制冷系统来研究纳米结构中的量子传输和学生培训

• 批准号: 9975943
• 负责人: Charles Marcus
• 金额: $ 9.74万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-09-01 至 2001-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9975943&HistoricalAwards=false
• 关键词: Acquisition; Sorption; Pumped; Dilution; Refrigerator

9975943MarcusThis grant will provide partial support for the acquisition of a new design of dilution refrigerator that uses a pair of computer-controlled sorption pumps to achieve millikelvin temperatures with reasonable cooling power ( 50m W at 100mK), without the use of external mechanical pumps to circulate the 3He/4He mixture. This novel design offers greatly simplified operation, and the possibility of significantly reduced vibrational heating. Both of these features are important to the research and educational programs in our laboratory, as described below. The best-supported and most reliable version of this new design includes a vapor shielded dewar, 10/12 T superconducting magnet, gas handling, and control electronics. Two new research projects will benefit directly from the new dilution refrigerator. (1) Adiabatic Quantum Pumping of Charge; and (2) Nanoscale Electroplating.The dilution refrigerator will be located in the expanded laboratory facilities in the Laboratory for Advanced Materials to assure that both graduate and undergraduate students have an opportunity to run their own experiment. "Run" in this sense typically means fabricate their own samples, usually using the NSF Stanford Notification Facility-several undergraduates from our lab in fact now have user grants in this facility-carry out the low-temperature measurements, analyze the data, compare to theory, and write up a report, presumably for publication.The equipment will significantly enhance the research capabilities and educational opportunities of faculty and students.

这笔拨款将为购买一种新设计的稀释冰箱提供部分支持，该冰箱使用一对计算机控制的吸收泵，以合理的冷却功率（50w, 100mK）达到毫开尔文的温度，而无需使用外部机械泵来循环3He/4He混合物。这种新颖的设计大大简化了操作，并有可能显著减少振动加热。这两个特征对我们实验室的研究和教育计划都很重要，如下所述。这种新设计的最佳支持和最可靠的版本包括蒸汽屏蔽杜瓦瓶，10/12 T超导磁体，气体处理和控制电子设备。两个新的研究项目将直接受益于新的稀释冰箱。(1)电荷的绝热量子泵浦；(2)纳米电镀。稀释冰箱将位于先进材料实验室扩建的实验室设施中，以确保研究生和本科生都有机会进行自己的实验。在这个意义上，“运行”通常意味着制造他们自己的样本，通常使用NSF斯坦福通知设施——我们实验室的几个本科生实际上现在在这个设施中获得了用户资助——进行低温测量，分析数据，比较理论，然后写一份报告，大概是为了发表。这些设备将大大提高教师和学生的研究能力和教育机会。