| Citation: | HONG Wei, LI Hong-gang, BAI Yan-zheng, ZHOU Ze-bing. Development and testing of the charge management system for tianqin[J]. Chinese Optics. doi: 10.37188/CO.2026-0087
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The test mass (TM) in orbit is subject to the charging effect of high-energy particles, which interferes with gravitational wave detection. This paper addresses the charge management requirements of the TianQin Project. First, an electrostatic force model is established to determine the charge threshold of the TM, which is limited to less than 2×10−13 C. Then, a charge management structure using a UV LED light source is designed, and an engineering prototype is developed accordingly. Finally, a ground testing system based on a torsion pendulum is constructed to evaluate the charge management performance. Experimental results show that at 1 mHz, the resolution of charge measurement is better than 2×10−14 C, and the resolution of charge control is approximately 6×10−14 C, which meet the requirements of space gravitational wave detection. These achievements provide a solid foundation for TianQin project.
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