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Helium-based cooling concept of the ET-LF interferometer


Lennard Busch, Xhesika Koroveshi, Steffen Grohmann

Beteiligtes Institut

Institut für Technische Thermodynamik und Kältetechnik (TTK)
Institut für Beschleunigerphysik und Technologie (IBPT)
Fakultät für Chemieingenieurwesen und Verfahrenstechnik (CIW)




The low-frequency interferometer in the Einstein Telescope (ET-LF) shall be operated at test mass temperatures of 10 K to 20 K. Motivated by the potential of using superfluid helium (He-II) for cooling the test masses, we derive a general cooling concept for the ET-LF cryostats. This concept is based on a helium refrigerator in each ET corner point, providing cooling capacity with He-II for the test masses at 2 K, as well as cooling capacity with normal helium (He-I) for radiation screens at 5 K and thermal shielding at 50 K to 80 K. The heat extraction path of the 2 K system is implemented by means of long capillaries, where the heat transport takes place by steady-state heat conduction in He-II. The integration of He-II filled capillary suspensions in the payload design may also offer a solution for achieving low temperatures of the test masses. This option will be investigated in terms of thermal dissipation and the propagation of vibrational noise from the helium cooling system into the payload.

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Auflösung 1916 x 1080 Pixel
Seitenverhältnis 479:270
Audiobitrate 128246 bps
Audio Kanäle 2
Audio Codec aac
Audio Abtastrate 48000 Hz
Gesamtbitrate 1071991 kbps
Farbraum yuv420p
Container mov,mp4,m4a,3gp,3g2,mj2
Medientyp video/mp4
Dauer 1327 s
Dateiname DIVA-2021-189_unknown.mp4
Dateigröße 177.802.060 byte
Bildwiederholfrequenz 25
Videobitrate 937701 kbps
Video Codec h264