Measurements of Magnetic Properties of Kilogram-Level Test Masses forGravitational-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 magnetizationmrand the magnetic susceptibilityχof TMs can be measured at the level of 1 nA m²and 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