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Design of a system for controlling a levitating sphere in superfluid 3He at extremely low temperatures

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Article number20069
<mark>Journal publication date</mark>8/10/2021
<mark>Journal</mark>Scientific Reports
Issue number1
Number of pages7
Publication StatusPublished
<mark>Original language</mark>English


We present a new mechanical probe to study the properties of superfluid 3He at microkelvin temperatures down to 100 μK. The setup consists of a set of coils for levitating a superconducting sphere and controlling its motion in a wide variety of regimes. In particular, the realisation of motion of a levitating body at a uniform velocity presents both an experimental challenge and a promising direction into the study of the edge states in topological superfluid 3He-B. We include the theoretical study of the device stability and simulations to illustrate the capabilities of the control system.