Upgrading of a Superconducting Rock Magnetometer

超导岩石磁力计的升级

• 批准号: 9727706
• 负责人: Robert Coe
• 金额: $ 5.87万
• 依托单位: University of California-Santa Cruz
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-03-01 至 2001-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9727706&HistoricalAwards=false
• 关键词: Upgrading; Superconducting; Rock; Magnetometer

9727706 Coe This grant provides partial support to the University of Californa-Santa Cruz for the costs of upgrading superconducting rock magnetometer (SRM) and building an in-line alternating field (AF) demagnetizer. The current SRM at UC-Santa Cruz was purchased in 1985, the third SRM ever built by 2G enterprises. It suffers from repeated freezing blockages within the liquid helium plumbing lines, rapid liquid He boil-off rate and an order of magnitude lower sensitivity than currently available on state- of-the-art SRM's equipped with DC SQUIDs. 2-G Enterprises will refurbish this SRM with DC SQUIDs and with improvements in the plumbing and thermal design that will both reduce operating costs and increase safety. The AF demagnetizer will be built in-house. The increased sensitivity afforded paleomagnetic investigations through addition of DC SQUIDS will improve the reliability of paleomagnetic declinations and inclinations calculated for weakly magnetized rocks and sediments. Funded tectonic studies in southern Asia and the eastern California shear zone will immediately benefit from this upgrade. Furthermore, the capabilities of an in-line AF demagnetizer will enable elimination of secondary component magnetizations in samples that have been struck by lighting and will prove useful for paleointensity measurements made on Miocene flood basalts from Steens Mountain and early Cretaceous flood basalts from the Parana Basin in Brazil. These measurements are crucial for understanding past variations in the geomagnetic field. ***

小行星9727706 这笔赠款为加州大学圣克鲁斯分校提供部分支持，用于升级超导岩石磁力计（SRM）和建造在线交变场（AF）退磁器的费用。 UC-Santa Cruz目前的SRM于1985年购买，是2G企业有史以来建造的第三个SRM。 它遭受液氦管道内的反复冻结堵塞、快速的液氦汽化速率以及比目前装备有DC SQUID的最先进SRM上可用的灵敏度低一个数量级。 2-G企业将使用DC SQUID对该SRM进行重新设计，并改进管道和热设计，从而降低运营成本并提高安全性。 AF消磁器将在内部制造。 通过增加DC SQUIDS，提高了古地磁调查的灵敏度，将提高计算弱磁化岩石和沉积物的古磁偏角和倾角的可靠性。 在南亚和东加州剪切带的资助构造研究将立即受益于这一升级。 此外，在线AF脱磁器的能力将能够消除二次分量磁化的样品已被击中的照明，并将证明是有用的古强度测量中新世洪水玄武岩从斯蒂恩斯山和早白垩世洪水玄武岩从巴拉那盆地在巴西。 这些测量对于了解地磁场过去的变化至关重要。 ***