Measurements of Magnetic Properties of Kilogram-Level Test Masses for Gravitational-Wave Detection Using a Torsion Pendulum
Hang Yin, Ding-Yin Tan, Ming Hu, Shun Wang, Yan-Zheng Bai, Shu-Chao Wu, and
Ze-Bing Zhou,*
In spaceborne gravitational-wave detectors, the stringent requirements on the magnetic cleanliness of the test masses (TMs) make the development of ground-based characterization techniques of their magnetic properties important. An electrostatically controlled torsion pendulum has been built to measure the magnetic properties of TianQin-like solid TMs. The remanent magnetization mr and the magnetic susceptibility χ of TMs can be measured at the level of 1 nA m2 and 8 × 10-7, respectively. The precisions of measurements are mainly limited by the mechanical sensitivity of silicon fiber. The experimental results from a solid tungsten TM as an example show that the apparatus provides a feasible way to investigate the bulk effect of a full-size TM for the TianQin mission with enough resolution.
期刊名： Physical Review Applied
期/卷：15
页码：014008
发表时间：2021
DOI: 10.1103/PhysRevApplied.15.014008
