Development of a 0.5 Tesla AF Demagnetizer

1053399coe这项拨款支持开发一种新的高磁场能力（0.5-1.0特斯拉）单轴交变场（AF）消磁器，以支持岩石和古磁学的研究。该设计将包括一个磁芯，由高磁导率材料制成，在一个空气冷却线圈中产生一个均匀的磁场，方向与样品孔横向。pi将首先建立一个0.5 T的AF设计系统，然后将尝试更具挑战性的1.0 T设计。一个成功的设备将产生比现有商用设备更高的峰值交变磁场（高5-6倍的磁场），并且能够对许多目前无法通过其他方法退磁的样品进行退磁，而不会产生虚假的初级残余磁化，特别是含有磁性矿物的岩石，这些矿物使用热退磁技术进行化学改变。它还将提供表征沉积岩磁性矿物学的能力，通过检查由AF退磁剩磁产生的矫顽力分布。开发的仪器将支持岩石和古地磁的合作研究。项目负责人将让本科生参与开发工作的某些方面

1053399CoeThis grant support the development of a new high magnetic field capable (0.5-1.0 Tesla) single axis Alternating Field (AF) Demagnetizer to support research in rock and paleomagnetism. The design would incorporate a magnetic core, built from high magnetic permeability material, in an air-cooled coil producing a uniform field oriented transverse to the sample bore. The PIs will first build a 0.5 T AF demag system and then will attempt the more challenging 1.0 T design. A successful device will yield a much higher peak alternating field than available on existing commercial devices (a factor of 5-6 higher field) and enable demagnetization of many samples that currently cannot be demagnetized via alternative methods without generating spurious primary remanent magnetizations, particularly rocks that contain magnetic minerals that are chemically altered using thermal demagnetization techniques. It will also offer the ability to characterize the magnetic mineralogy of sedimentary rocks through examination of coercivity distributions derived from AF demagnetization of magnetic remanence. The developed instrument will support collaborative research in rock and paleomagnetism. The PIs will engage undergraduates in some aspects of the development effort.***