Göttingen 2012 – scientific programme

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GR: Fachverband Gravitation und Relativitätstheorie

GR 18: Gravitationswellen

GR 18.1: Talk

Friday, March 2, 2012, 09:10–09:30, ZHG 002

Time-Delay Interferometry and clock noise removal for LISA — •Markus Otto — Centre for Gravitational Physics Hannover and QUEST, Callinstraße 38, 30167 Hannover

Laser phase noise is the dominant noise source in the on-board measurements of the space-based gravitational wave detector LISA. Time-Delay Interferometry (TDI) provides synthesized data streams free of laser phase noise while preserving the gravitational wave signal. At the same time TDI also removes fluctuations of the on-board clocks that distort the sampling process. TDI needs precise information about the spacecraft separations, sampling times and differential clock noise between the three spacecraft. These are measured using auxiliary modulations on the laser light.

In our talk, we will discuss a compliant algorithm that corrects for both clock and laser noise in the case of a rotating, non-breathing LISA constellation. Furthermore, we will consider the absolute order of laser frequencies forming the beatnote at the photodetectors. As an outlook, we will shortly discuss an optical setup to verify the TDI algorithm in the experiment.