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000619905 088__ $$2arXiv$$aarXiv:2402.11977
000619905 1001_ $$0P:(DE-H253)PIP1021479$$aFranke, Alexander$$b0$$eCorresponding author
000619905 245__ $$aMeasurement of the thermal accommodation coefficient of helium on a crystalline silicon surface at low-temperatures
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000619905 520__ $$aProposals 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.
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000619905 7001_ $$0P:(DE-H253)PIP1081510$$aSueltmann, Nils Frederik$$b1
000619905 7001_ $$0P:(DE-H253)PIP1093189$$aReinhardt, Christoph$$b2$$eCorresponding author
000619905 7001_ $$0P:(DE-H253)PIP1088048$$aCroatto, Sandy$$b3
000619905 7001_ $$0P:(DE-H253)PIP1001671$$aSchaffran, Joern$$b4
000619905 7001_ $$0P:(DE-H253)PIP1094928$$aMasalehdan, Hossein$$b5
000619905 7001_ $$0P:(DE-H253)PIP1003168$$aLindner, Axel$$b6
000619905 7001_ $$0P:(DE-H253)PIP1094999$$aSchnabel, Roman$$b7
000619905 773__ $$0PERI:(DE-600)1473117-4$$a10.1088/1361-6382/ad7184$$gVol. 41, no. 19, p. 195013 -$$n19$$p195013 $$tClassical and quantum gravity$$v41$$x0264-9381$$y2024
000619905 7870_ $$0PUBDB-2025-00343$$aFranke, Alexander et.al.$$d2024$$iIsParent$$rarXiv:2402.11977$$tMeasurement of the thermal accommodation coefficient of helium on a crystalline silicon surface at low-temperatures
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