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Test facility for experimental investigations of the He-II based ET-LF payload cooling concept

Koroveshi, Xhesika ORCID iD icon 1,2; Grohmann, Steffen ORCID iD icon 1,2; Stamm, Michael 2; Rapagnani, Piero; Mangano, Valentina
1 Institut für Technische Thermodynamik und Kältetechnik (TTK), Karlsruher Institut für Technologie (KIT)
2 Institut für Beschleunigerphysik und Technologie (IBPT), Karlsruher Institut für Technologie (KIT)


The Einstein Telescope (ET) is a third generation gravitational wave detector, combining a low-frequency (LF) and a high-frequency (HF) laser interferometer. Cryogenic operation of ET-LF in the temperature range of 10-20 K is essential to suppress the suspension thermal noise (STN), which dominates the detection sensitivity at frequencies below 10 Hz. The minimization of the STN requires suspension materials with high thermal conductivity and low mechanical dissipation at cryogenic temperatures. Motivated by the exceptional heat conductivity of static He-II and a presumably low dissipation, a new marionette suspension design with a He-II filled titanium tube has been proposed and, theoretically, shown to meet the ET-D sensitivity requirements. The concept includes open fundamental questions that can only be addressed by measurements of the mechanical Q-factor, providing crucial insights in the dissipative behaviour of such a system. Hence, an experimental setup for cryogenic Q-factor measurements is being planned. The scope of experiments and a first conceptual design are being presented here. Beside the Q-factor measurements, a main focus of this facility is given to R&D on the integration of the He-II system and the mechanical interface to the payload in view of noise isolation.

Volltext §
DOI: 10.5445/IR/1000161203
Veröffentlicht am 04.08.2023
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Beschleunigerphysik und Technologie (IBPT)
Institut für Technische Thermodynamik und Kältetechnik (TTK)
Publikationstyp Poster
Publikationsdatum 25.05.2023
Sprache Englisch
Identifikator KITopen-ID: 1000161203
HGF-Programm 54.11.11 (POF IV, LK 01) Accelerator Operation, Research and Development
Veranstaltung Gravitational Wave Advanced Detector Workshop (GWADW 2023), La Biodola, Elba, Italy, 21.05.2023 – 27.05.2023
Projektinformation Einstein-Teleskop (BMBF, 05A20VK4)
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