LISA Non-Linear Dynamics and Tilt-To-Length Coupling
Universität Heidelberg(海德堡大学);KU Leuven(荷语鲁汶大学);Leuven Gravity Institute, KU Leuven(荷语鲁汶大学引力研究所);Max Planck Institute for Gravitational Physics (Albert Einstein Institute)(马克斯·普朗克引力物理研究所(爱因斯坦研究所));Leibniz Universität Hannover(汉诺威莱布尼茨大学)
Lavinia Heisenberg, Henri Inchauspé, Sarah Paczkowski, Ricardo Waibel
备注:
31 pages, 22 figures; added one reference, small changes to appendix E.1
For the LISA mission, Tilt-To-Length (TTL) coupling is expected to be one of the dominant instrumental noise contributions after laser frequency noise is suppressed based, on assumptions on the size of the coupling and angular jitter levels. This work uses for the first time a closed-loop, non-linear, and time-varying dynamics implementation to simulate detailed angular jitters for the spacecraft and optical benches. In turn, this gives an improved expectation of the TTL contribution to the interferometric output. It is shown that the TTL coupling impact is limited given current estimates on the size of coupling coefficients. A time-domain Least Squares estimator is used to infer the TTL parameters from the simulated measurements. The bias and correlations limit the estimator in the case of regular datasets with amplified TTL coefficients to a relative error of $10\%$, but the subtraction of the TTL signal still works well. For lower readout noises, the estimation error diverges, which can be mitigated using a regularization term. Alternatively, using sinusoidal maneuvers improves the inference to a high accuracy of $0.1\%$ for TTL coefficients around the expected level, removing all correlations in the inferred parameters. This validates the maneuver design by Wegener et al. (2025) in this closed-loop setting.
Mathematical derivation and verification of the amplitude of LISA's interferometric signals on an ultra-stable interferometer testbed
Max Planck Institute for Gravitational Physics (Albert Einstein Institute)(马克斯·普朗克引力物理研究所(爱因斯坦研究所));Leibniz Universität Hannover(汉诺威莱布尼茨大学);University of Granada(格拉纳达大学)
Validation of optical pathlength stability in a LISA test-bench demonstrator
Université Paris Cité(巴黎西岱大学);CNRS(法国国家科学研究中心);CEA(法国原子能和替代能源委员会);Observatoire de Paris – PSL(巴黎天文台-PSL);CNES(法国国家空间研究中心);CEA, Centre de Saclay, IRFU (Institut de Recherche sur les Lois Fondamentales de l’Univers)(CEA萨克雷中心,基础物理研究研究所(IRFU));CNRS/IN2P3(法国国家科学研究中心/法国国家粒子与核物理研究所);Centre de Physique des Particules de Marseille (CPPM)(马赛粒子物理中心);Laboratoire d’Astrophysique de Marseille (LAM)(马赛天体物理实验室);Université Côte d’Azur(蔚蓝海岸大学);Observatoire de la Côte d’Azur (OCA)(蔚蓝海岸天文台);Laboratoire ARTEMIS(ARTEMIS实验室);Université de Toulouse(图卢兹大学);UPS(图卢兹第三大学);Laboratoire des 2 Infinis – Toulouse (L2IT)(双无限-图卢兹实验室(L2IT));EXAIL Technologies(EXAIL科技公司);Bertin Technologies(贝尔坦科技公司);Sorbonne Université(索邦大学);Laboratoire national de métrologie et d’essais (LNE)(国家计量与测试实验室(LNE))