Upgrade to the Superconducting Rock Magnetometer and Acquisition of a High-Sensitivity Susceptibility System, Paleomagnetism Laboratory

0213978 Geissman该奖项将支持对超导岩石磁力仪（2G Enterprises 760 R三轴系统）的重要升级，并将支持为新墨西哥州大学的古地磁实验室增加高灵敏度Kappabridge。 升级和设备购置将大大提高我们实验室在古地磁和岩石磁性研究方面的能力，这是并已被新墨西哥州大学（UNM）和外部研究人员利用。 磁强计升级将大大改善实验室的整体运行，并将涉及（1）用DC SQuIDS取代RF驱动的SQuIDS，提供比现有RF驱动的SQuIDS至少高一个数量级的力矩灵敏度，（2）将样品访问区域从7.6 cm直径减少到4.2 cm，（3）用改进的超绝缘改装磁强计，允许显著降低液氦蒸发速率，以及（4）用扩大的进入管线替换部分液氦填充管线，以防止管线的主要冻结（和堵塞）的不断发展。 这些对磁力计的升级将提高我们测量非常弱磁化岩石的能力，这些岩石通常违背我们在磁力计当前阈值附近提取有用信息的最佳尝试。 所要求的新磁化率系统将用于测量一系列地质材料的磁化率的体积和各向异性。

0213978GeissmanThis award will support an important upgrade to the superconducting rock magnetometer (2G Enterprises 760R three axis system) and will support the addition of a high sensitivity Kappabridge for the Paleomagnetism Laboratory at the University of New Mexico. The upgrade and equipment acquisition will considerably enhance the capability of our laboratory in paleomagnetic and rock magnetic research, which is and has been utilized by a range of University of New Mexico (UNM) and outside researchers. The magnetometer upgrade will greatly improve the overall operation of the laboratory and will involve (1) replacing the Rf-driven SQuIDs with DC SQuIDS, affording at least an order of magnitude greater moment sensitivity over the existing Rf-driven SQuIDS, (2) reducing the specimen access region from 7.6 cm diameter to 4.2 cm, (3) retrofitting the magnetometer with improved superinsulation, allowing for a considerably decreased liquid helium boil-off rate, and (4) replacing part of the liquid helium fill line with an enlarged access line, to prevent the nagging development of major freezing (and blockage) of the line. These upgrades to the magnetometer will improve our ability to measure very weakly magnetized rocks that typically defy our best attempts to extract useful information near the current threshold of the magnetometer. The requested new susceptibility system, will be used to measure bulk and anisotropy of magnetic susceptibility of a range of geologic materials.***