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@ARTICLE{Franke:619905,
      author       = {Franke, Alexander and Sueltmann, Nils Frederik and
                      Reinhardt, Christoph and Croatto, Sandy and Schaffran, Joern
                      and Masalehdan, Hossein and Lindner, Axel and Schnabel,
                      Roman},
      title        = {{M}easurement of the thermal accommodation coefficient of
                      helium on a crystalline silicon surface at low-temperatures},
      journal      = {Classical and quantum gravity},
      volume       = {41},
      number       = {19},
      issn         = {0264-9381},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {PUBDB-2024-08006, arXiv:2402.11977},
      pages        = {195013},
      year         = {2024},
      note         = {12 pages, 5 figures},
      abstract     = {Proposals for next-generation gravitational wave
                      observatories include cryogenically cooled 200 kg test mass
                      mirrors suspended from pendulums and made of a crystalline
                      material such as crystalline silicon. During operation of
                      the observatories, these mirrors undergo heating due to the
                      absorption of laser radiation of up to a watt. Low noise
                      cooling techniques need to be developed. Low-pressure helium
                      exchange gas at 5 K might contribute to the challenging
                      task. Here, we report the measurement of the helium
                      accommodation coefficient $\alpha(11\,\mathrm{K} \lt T \lt
                      30\,\mathrm{K})$, which is the probability that a helium
                      atom thermalises with a surface at a given temperature when
                      reflected from it. We find $\alpha(T) \gt 0.7$ for
                      temperatures ${\lt}20$ K, which increases the cooling power
                      compared to recently used assumptions. The idea of free
                      molecular flow helium gas cooling is thus supported and
                      might find application in some observatory concepts.},
      cin          = {ALPS},
      ddc          = {530},
      cid          = {I:(DE-H253)ALPS-20130318},
      pnm          = {611 - Fundamental Particles and Forces (POF4-611) / DFG
                      project G:(GEPRIS)390833306 - EXC 2121: Quantum Universe
                      (390833306)},
      pid          = {G:(DE-HGF)POF4-611 / G:(GEPRIS)390833306},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)16},
      eprint       = {2402.11977},
      howpublished = {arXiv:2402.11977},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2402.11977;\%\%$},
      UT           = {WOS:001304404200001},
      doi          = {10.1088/1361-6382/ad7184},
      url          = {https://bib-pubdb1.desy.de/record/619905},
}