Dry demagnetization cryostat for sub-millikelvin helium experiments: refrigeration and thermometry.
Dry demagnetization cryostat for sub-millikelvin helium experiments: refrigeration and thermometry.
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用于亚毫开尔文氦实验的干式去磁低温恒温器：制冷和测温。
DOI：
10.1063/1.4891619
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Alexander Savin
中科院分区：
文献类型：
--
作者：
I. Todoshchenko;Jukka;R. Blaauwgeers;P. Hakonen;Alexander Savin
我们证明了成功的“干”制冷的量子流体的T = 0.16 mK，通过使用铜核退磁阶段，是由基于脉冲管的稀释制冷机预冷。这种类型的制冷提供了一个灵活而简单的亚mK解决方案，以满足各种需求，包括超流（3）He的实验。我们的中心设计原则是消除高场磁体和核制冷级之间的相对振动，这导致在35 mT的磁场中获得的Q = 4.4 nW的最小热漏。对于温度测量，我们采用了浸入液体（3）He中的石英音叉。我们证明了在超流（3）He中，在从流体动力学区到弹道准粒子区的交叉点处，叉形振子可以被认为是自校准的。
We demonstrate successful "dry" refrigeration of quantum fluids down to T = 0.16 mK by using copper nuclear demagnetization stage that is pre-cooled by a pulse-tube-based dilution refrigerator. This type of refrigeration delivers a flexible and simple sub-mK solution to a variety of needs including experiments with superfluid (3)He. Our central design principle was to eliminate relative vibrations between the high-field magnet and the nuclear refrigeration stage, which resulted in the minimum heat leak of Q = 4.4 nW obtained in field of 35 mT. For thermometry, we employed a quartz tuning fork immersed into liquid (3)He. We show that the fork oscillator can be considered as self-calibrating in superfluid (3)He at the crossover point from hydrodynamic into ballistic quasiparticle regime.