Upgrade of Superconducting Rock Magnetometer

0004064Sen.这笔赠款为佛罗里达国际大学的超导岩石磁强计(SRM)升级为直流(DC)超导量子干涉器件(SQUID)、更换冷头和制冷器压缩机以及改装氦杜瓦提供部分支持。PI已经记录了FIU(11岁)目前的SRM充满了问题，包括快速的He沸腾、He管道中频繁的冰块以及一个不起作用的y轴射频(RF)鱿鱼，使得老化的机器只能测量到磁场的两个分量。DC SQUID在测量灵敏度方面比RF SQUID提高了一个数量级以上，现在是领先的古磁学家在最先进的SRM中使用的事实上的标准传感器。添加新的氦气杜瓦和制冷机压缩机还将增加该仪器在灌装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延长仪器的使用寿命。升级后的磁力计将允许继续研究极性转变附近的古地磁场行为，并将用于培训一批不同种族的本科生和理科学生，学习古地磁研究方法。

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.***