SAMOP 2023 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 11: Precision Measurements: Gravity I

Q 11.5: Talk

Monday, March 6, 2023, 18:00–18:15, E214

Postprocessing subtraction of tilt-to-length noise in LISA — •Sarah Paczkowski^{1, 2}, Roberta Giusteri^{1, 2}, Martin Hewitson^{1, 2}, Nikolaos Karnesis³, Ewan Fitzsimons⁴, Gudrun Wanner^{1, 2}, and Gerhard Heinzel^{1, 2} — ¹Max Planck Institute for Gravitational Physics (Albert Einstein Institute), D-30167 Hannover, Germany — ²Leibniz Universität Hannover, D-30167 Hannover, Germany — ³Department of Physics, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece — ⁴The UK Astronomy Technology Centre, Royal Observatory, Edinburgh, Blackford Hill, Edinburgh EH9 3HJ, United Kingdom

The space mission LISA aims to observe gravitational waves over a frequency range from 0.1 mHz to 1 Hz. LISA is characterised by its three satellites which form a nearly equilateral triangle with a 2.5 million km arm length. Laser interferometers will measure the distance between free-falling test masses hosted in each satellite with picometer precision down to mHz frequencies. To reach this performance, several noise sources have to be kept under control.

One of these is the coupling of an angular jitter into the interferometric phase readout, called TTL coupling. This cross-coupling arises, for example, from misalignments within the optical system. Unless mitigated, this noise source is expected to affect the scientific performance of LISA. In this talk, I will present a method to calibrate and subtract TTL noise that has no impact on LISA science operations. Selected proof-of-principle simulation results will demonstrate the performance based on the current design configuration of LISA.