A New Device for Studying Low or Zero Frequency Mechanical Motion at Very Low Temperatures
A New Device for Studying Low or Zero Frequency Mechanical Motion at Very Low Temperatures
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DOI：
10.1007/s10909-011-0388-3
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发表时间：
2011-11-01
影响因子：
2
通讯作者：
Williams, P.
中科院分区：
文献类型：
--
作者：
Bradley, D. I.;Clovecko, M.;Williams, P.
我们已经开发了一种新的“软线”装置，用于在非常低的温度下研究量子流体和固体的运动。该设备特别适合于产生大幅度的运动，用于测量低频阻力，并通过测量瞬态行为来研究“零”频率动态。该设备是非常通用的，并允许运动的速度和振幅范围广泛的研究。它产生的热量可以忽略不计，因此非常适合超低温实验。该装置在量子流体和固体研究中有许多潜在的应用，包括在层流和湍流状态下研究低频下的阻力，以及研究（超）固体He-4中的运动。我们讨论了该装置的工作原理和模式，并给出了在真空、正常液态He-3和超流He-4中的一些初步测量结果。我们还提出了一个“软网格”的设备，它可以用于在低温下产生大量的超流体中的量子湍流的测量。
We have developed a new "floppy wire" device for studying the motion through quantum fluids and solids at very low temperatures. The device is particularly well suited for producing large amplitudes of motion, for measuring drag forces at low frequency, and for studying "zero" frequency dynamics by measuring transient behavior. The device is very versatile and allows motion to be studied over a broad range of velocities and amplitudes. It generates negligible heat leaks and so is ideally suited for ultra low temperature experiments. The device has many potential applications in quantum fluids and solids research, including the study of drag forces at low frequencies in both the laminar and turbulent flow regimes, and the investigation of motion in (super)solid He-4. We discuss the principles and modes of operation of the device and present some preliminary measurements in vacuum, in normal liquid He-3 and in superfluid He-4. We also present measurements of a "floppy grid" device, which could be used for generating large volumes of quantum turbulence in superfluids at low temperatures.