Upgrade of Superconducting Rock Magnetometer

这项拨款为佛罗里达国际大学用直流超导量子干涉装置（SQUIDs）升级超导岩石磁力仪（SRM）、更换冷头和制冷机压缩机以及改造氦杜瓦瓶的费用提供部分支持。PI已经记录了FIU目前的SRM（11年）充满了问题，包括氦快速沸腾，氦管道管道中经常出现冰块，y轴射频（Rf） SQUID无法正常工作，只有两个磁场分量可以用老化的机器测量。DC squid的测量灵敏度比Rf squid提高了一个数量级，现在是领先的古地磁学家在最先进的srm中使用的事实上的标准传感器。增加新的He杜瓦瓶和制冷机压缩机也将增加该仪器在填充之间的可用分析时间，降低仪器的运行成本，并通过减少每工作小时所需的热循环次数来增加仪器的使用寿命。升级后的磁力计将允许在极性转变附近继续研究古磁场行为，并将用于培养种族多样化的本科生和硕士学生在古磁学研究方法

0004064SenThis grant provides partial support for the costs of upgrading the superconducting rock magnetometer (SRM) at Florida International University with direct current (DC) superconducting quantum interference devices (SQUIDs), replacing the cold head and cryocooler compressor, and modifying the helium dewar. The PI has documented that the current SRM at FIU (11 years old) is fraught with problems including, rapid He boil off, frequent ice blocks in the He plumbing lines and a non-functional y-axis radio frequency (Rf) SQUID leaving only two components of the magnetic field measurable with the aging machine. DC SQUIDs offer over an order of magnitude increase in measurement sensitivity over Rf SQUIDs and are now the de facto standard sensors used in state-of-the-art SRMs by leading paleomagnetists. The addition of a new He dewar and cryocooler compressor will also, increase available analysis time on this instrument between fills, decrease the operational costs of the instrument, and increase the useful life of the instrument by reducing the number of thermal cycles required per operating hour. The upgraded magnetometer will allow for continued studies of paleomagnetic field behavior near polarity transitions and will be used to train a racially diverse crop of undergraduate and M.S. students in paleomagnetic research methods.***