Cryogenic radiative cooling of a large payload for gravitational wave detector
Design and results of the E-TEST project
Lionel Jacques (Université de Liège)
Morgane Zeoli (Université de Liège, Université Catholique de Louvain)
Anthony Amorosi (Vrije Universiteit Brussel, Université de Liège)
Alessandro Bertolini (Nikhef)
Christophe Collette (Université de Liège)
Robin Cornelissen (Université de Liège)
Chiara Di Fronzo (Université de Liège)
Serge Habraken (Université de Liège)
Jérôme Loicq (TU Delft - Aerospace Engineering, Université de Liège)
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Abstract
Third-generation gravitational wave detectors will use large mirrors isolated from seismic motion at low frequency, and also cooled down to cryogenic temperatures. To fulfil these two specifications, the E-TEST project explores the possibility of using a purely non-contact radiative cooling strategy. Based on cooling predictions, the paper includes a detailed design of the cryostat and the assembly procedure. A test campaign demonstrated that the proposed strategy succeeded in bringing the temperature of a [Figure presented] dummy mirror down to [Figure presented] in 19 days. These encouraging results are paving the way toward a fully radiative approach for cooling the mirrors of the future Einstein Telescope.