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

升级超导岩石磁力计并购置高灵敏度磁化率系统，古地磁实验室

• 批准号: 0213978
• 负责人: John Geissman
• 金额: $ 10.86万
• 依托单位: University of New Mexico
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-08-01 至 2004-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0213978&HistoricalAwards=false
• 关键词: Upgrade; Superconducting; Rock; Magnetometer; Acquisition

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.***

0213978Geissman该奖项将支持超导岩石磁强计(2G Enterprise 760R三轴系统)的重要升级，并将支持为新墨西哥大学的古地磁实验室增加一个高灵敏度的卡普布里奇。升级和设备采购将大大提高我们实验室在古地磁和岩石磁学研究方面的能力，新墨西哥大学(UNM)和外部的一系列研究人员正在并已经利用了这一能力。磁力仪的升级将极大地改善实验室的整体运作，包括：(1)用直流鱿鱼取代射频驱动的鱿鱼，提供比现有的射频驱动鱿鱼高至少一个数量级的力矩敏感度；(2)将样品检索区从7.6厘米直径缩小到4.2厘米；(3)改进磁强计的超绝缘性，使液氦沸腾速率显著降低；以及(4)用扩大的检修线更换部分液氦充填线，以防止管路严重冻结(和堵塞)。磁力计的这些升级将提高我们测量非常弱的磁化岩石的能力，这些岩石通常无视我们在磁力计当前阈值附近提取有用信息的最大努力。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。