Upgrading of a Superconducting Rock Magnetometer

9727706 COE这笔赠款为加州大学圣克鲁斯分校提供部分资助，用于升级超导岩石磁强计(SRM)和建造在线交变磁场(AF)消磁器。加州大学圣克鲁斯分校目前的SRM是在1985年购买的，这是2G企业制造的第三台SRM。它在液氦管道内反复冻结堵塞，液氦沸腾速度快，灵敏度比目前配备DC SQUID的最先进的SRM低一个数量级。2-G企业将使用DC SQUID翻新这台SRM，并在管道和热设计方面进行改进，这将降低运营成本并提高安全性。AF消磁器将在内部制造。DC鱿鱼的加入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地磁倾角和倾角的可靠性。南亚和加州东部剪切带的构造研究资金将立即从这一升级中受益。此外，直列式AF消磁器的能力将能够消除被雷击的样品中的二次成分磁化，并将被证明对来自斯廷斯山的中新世洪水玄武岩和来自巴西巴拉那盆地的早白垩世洪水玄武岩进行的古强度测量是有用的。这些测量对于了解过去地磁场的变化至关重要。***

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. ***