Measurement of the thermal accommodation coefficient of helium on a crystalline silicon surface at low-temperatures
arxiv(2024)
摘要
Next-generation gravitational wave observatories are expected to use
cryogenically cooled, pendulum-suspended 200 kg test mass mirrors from 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
α(11 K 0.7 for temperatures < 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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