Aluminum nuclear demagnetization refrigerator for powerful continuous cooling
arxiv(2024)
摘要
Many laboratories routinely cool samples to 10 mK, but relatively few can
cool condensed matter below 1 mK. Easy access to the microkelvin range would
propel fields such as quantum sensors and quantum materials. Such temperatures
are achieved with adiabatic nuclear demagnetization. Existing nuclear
demagnetization refrigerators (NDR) are "single-shot", and the recycling time
is incompatible with proposed sub-mK experiments. Furthermore, a high cooling
power is required to overcome the excess heat load of order nW on NDR
pre-cooled by cryogen-free dilution refrigerators. We report the performance of
an aluminum NDR designed for powerful cooling when part of a dual stage
continuous NDR (CNDR). Its thermal resistance is minimized to maximize the
cycling rate of the CNDR and consequently its cooling power. At the same time,
its susceptibility to eddy current heating is minimized. A CNDR based on two of
the aluminum NDR presented here would have a cooling power of approximately 40
nW at 560 μK.
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