2026-04-13T01:36:16Zhttps://recercat.cat/oai/request

oai:recercat.cat:2117/4175162026-01-30T09:18:16Zcom_2072_1033col_2072_452950

00925njm 22002777a 4500 dc Armano, M. author Audley, H. author Baird, J. author Binetruy, P. author Born, M. author Bortoluzzi, D. author Castelli, Eleonora author Cavalleri, A. author Cesarini, A. author Cruise, M. author Danzmann, K. author de Deus Silva, Marcus author Diepholz, I author Dixon, G. author Dolesi, R author Ramos Castro, Juan José author 2024-09-03 The tilt-to-length coupling during the LISA Pathfinder mission has been numerically and analytically modeled for particular time spans. In this work, we investigate the long-term stability of the coupling coefficients of this noise. We show that they drifted slowly (by 1¿¿µm/rad and 6×10-6 in 100 days) and were strongly correlated to temperature changes within the satellite (8¿¿µm/rad/K and 30×10-6/K). Based on analytical tilt-to-length coupling models, we attribute the temperature-driven coupling changes to rotations of the test masses and small distortions in the optical setup. Particularly, our findings lead to the conclusion that LISA Pathfinder’s optical baseplate was bent during the cooldown experiment, which started in late 2016 and lasted several months. Peer Reviewed Postprint (published version) Àrees temàtiques de la UPC::Enginyeria electrònica::Microelectrònica Gravitational waves Optical interferometry Tilt-to-length coupling in LISA pathfinder: long-term stability