Dortmund 2021 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 15: Experimental methods I
T 15.8: Vortrag
Montag, 15. März 2021, 17:45–18:00, To
Gas cooling of test masses for future gravitational-wave observatories — Christoph Reinhardt1, •Alexander Franke2, Jörn Schaffran1, Roman Schnabel2, and Axel Lindner1 — 1Deutsches Elektronen Synchrotron (DESY), 22607 Hamburg, Germany — 2Institut für Laserphysik und Zentrum für Optische Quantentechnologien der Universität Hamburg, Hamburg, Germany
Recent observations made with Advanced LIGO and Advanced Virgo have initiated the era of gravitational-wave astronomy. The number of events detected by current observatories is partially limited by noise arising from temperature-induced position fluctuations of the test mass mirror surfaces used for probing space time dynamics. Future gravitational-wave observatories address this limitation by using cryogenically cooled test masses; current approaches for continuously removing heat (resulting from absorbed laser light) rely on black-body radiation or conduction through suspension fibers.
We investigate cooling via helium gas impinging on the test mass in the free molecular flow regime and develop a relation between gas-induced cooling power and corresponding added observatory strain noise. The application of our analytical models and numerical simulations is presented with regard to the conceptual design of the Einstein Telescope.