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. ***

9727706 Coe 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) 消磁器。 加州大学圣克鲁斯分校目前的 SRM 是 1985 年购买的，是 2G 企业建造的第三个 SRM。 它存在液氦管道内反复冻结堵塞、液氦蒸发速度快以及灵敏度比目前配备 DC SQUID 的最先进 SRM 低一个数量级的问题。 2-G Enterprises 将使用 DC SQUID 翻新该 SRM，并对管道和热设计进行改进，从而降低运营成本并提高安全性。 AF 消磁器将在内部制造。 通过添加 DC SQUIDS 来提高古地磁调查的灵敏度，将提高弱磁化岩石和沉积物计算的古地磁偏角和倾角的可靠性。 南亚和东加州剪切带的受资助构造研究将立即受益于此次升级。 此外，在线 AF 消磁器的功能将能够消除被闪电击中的样品中的次生磁化强度，并且对于对斯廷斯山中新世溢流玄武岩和巴西巴拉那盆地早白垩世溢流玄武岩进行古强度测量非常有用。 这些测量对于了解地磁场过去的变化至关重要。 ***