First result of orbit verification of Taiji-1 hall micro thruster,International Journal of Modern Physics A

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First result of orbit verification of Taiji-1 hall micro thruster
International Journal of Modern Physics A ( IF 1.4 ) Pub Date : 2021-03-29 , DOI: 10.1142/s0217751x21400133
Shu-Yan Xu _{1,

2} , Lu-Xiang Xu _{1,

3} , Lin-Xiao Cong ₃ , Yong-Gui Li ₃ , Cong-Feng Qiao ₃ ,

Affiliation

The Hall Micro Thrusters (HMTs) use cold gas or accelerated plasma dual mode to provide ultra-precise spacecraft altitude control. They were operated in space for the first time as part of the demonstration payloads on Chinese Academy of Science’s (CASs) Taiji-1 spacecraft since September 2019. Hall Micro Thruster Assemblies (HMTAs) were the actuators in drag-free control, and will compensate the nonconservative force for gravity wave observatories. The HMTAs meet the requirements of operating at 5–100 μ N of thrust with 0.7 μ N resolution and ≤0.6 μ N/Hz1/2 (0.01–1 Hz) noise to deliver the nanometer-level precision control as fast as 30 ms measured by Gravitational Reference Sensor (GRS). A transfer function model in z-domain was fit and used to filter HMTs cathode voltage to predict GRSs thrust noise response. Simulations of a single or dual-frequency disturbance and the corresponding compensation demonstrated that HMTAs could deliver the required thrust profile expected. The capability to meet the requirements of thruster noise in drag-free control is critical for future missions because the acceleration noise on test mass directly relates to the gravity wave signa l. Preliminary in-orbit verification of Taiji-1 has showed HMTAs’ great potential in future, and the data in the experiments are presented in this paper.

更新日期：2021-03-29

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