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Multiparameter hierarchical sensitivity analysis of tilt-to-length coupling noise in Taiji science interferometer |
| Fei Xie(谢菲)1,2,3, Xiaodong Peng(彭晓东)1,2,4,5,†, Wenlin Tang(唐文林)2, Mengyuan Zhao(赵梦圆)6, and Xiaoshan Ma(马晓珊)7,á |
1 School of Fundamental Physics and Mathematical Sciences, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences (UCAS), Hangzhou 310024, China;
2 Key Laboratory of Electronics and Information Technology for Space System, National Space Science Center, Chinese Academy of Sciences (CAS), Beijing 100190, China;
3 University of Chinese Academy of Sciences, Beijing 100049, China;
4 Taiji Laboratory for Gravitational Wave Universe, Hangzhou 310024, China;
5 Key Laboratory of Gravitational Wave Precision Measurement of Zhejiang Province, Hangzhou 310024, China;
6 School of Information, Xi'an University of Finance and Economics, Xi'an 710100, China;
7 National Key Laboratory of Science and Technology on Advanced Light-duty Gas-turbine, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China |
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Abstract Tilt-to-length (TTL) coupling noise is a critical issue in space-based gravitational wave detection due to its complex dependence on multiple interacting factors, which complicates the identification of dominant parameters. To address this challenge, we develop a simulation model of the Taiji scientific interferometer, generating noise datasets under multi-parameter conditions. Given the uniqueness of the telescope as well as the convergence behavior of the algorithm, the analysis is structured hierarchically: (i) the telescope level and (ii) the optical bench level. A hierarchical framework combining XGBoost and SHapley Additive exPlanations (SHAP) values is employed to model the intricate relationships between parameters and TTL coupling noise, supplemented by sensitivity analysis. Our results identify pointing jitter and telescope radius as the dominant parameters at the telescope level, while the angles of the plane mirrors and beam splitters are most influential at the optical bench level. The parameter space is reduced from 86 dimensions to 14 dimensions without sacrificing model accuracy. This approach offers actionable insights for optimizing the Taiji interferometer design.
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Received: 18 March 2025
Revised: 18 June 2025
Accepted manuscript online: 17 September 2025
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PACS:
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07.60.Ly
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(Interferometers)
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04.80.Nn
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(Gravitational wave detectors and experiments)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2020YFC2200100) and the CAS’s Strategic Pioneer Program on Space Science (Grant No. XDA1502110201). |
Corresponding Authors:
Xiaodong Peng, Xiaoshan Ma
E-mail: Pxd@nssc.ac.cn;maxiaoshan@iet.cn
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Cite this article:
Fei Xie(谢菲), Xiaodong Peng(彭晓东), Wenlin Tang(唐文林), Mengyuan Zhao(赵梦圆), and Xiaoshan Ma(马晓珊) Multiparameter hierarchical sensitivity analysis of tilt-to-length coupling noise in Taiji science interferometer 2026 Chin. Phys. B 35 010701
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