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

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.

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

We present a new mechanical probe to study the properties of superfluid 3 He at microkelvin temperatures down to 100µK. 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 3 He-B. We include the theoretical study of the device stability and simulations to illustrate the capabilities of the control system.

Interaction Force between a Small Magnet and a Superconducting Sphere

The interaction force between a small magnet and a superconducting sphere is calculated using the method of images. Our approach can be easily verified by applying boundary conditions. This work will possesses and clear the discrepancies found in the literature. For collinear dipoles case (small magnet and its image), we found the elevated force to be dependent on the geometrical dimensions of the problem