Examinando por Autor "Uriarte, Carlos"

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Design of a system for controlling a levitating sphere in superfluid 3He at extremely low temperatures
(Springer Nature, 2021-10-08) Arrayás, Manuel; Trueba, José Luis; Uriarte, Carlos; Zmeev, Dmitry E.
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.
Machine learning techniques in magnetic levitation problems
(Elsevier, 2022) Arrayás, Manuel; Trueba, José L.; Uriarte, Carlos
We present a method for calculating the stability region of a perfect diamagnet levitated in a magnetic field created by a circular current loop making use of the machine learning techniques. As an application we compute stability regions, points of stable equilibrium and stable oscillatory motions in two chip-based superconducting trap architectures used to levitate superconducting particles. Our procedure is an alternative to a full numerical scheme based on finite element methods which are expensive to implement for optimizing experimental parameters.
Progress on Levitating a Sphere in Cryogenic Fluids
(Springer Nature, 2023-02-04) Arrayás, Manuel; Bettsworth, Francis; Haley, Richard P.; Schanen, Roch; Trueba, José Luis; Uriarte, Carlos; Zavjalov, Vladislav; Zmeev, Dmitry E.
We present the working prototype of a levitation system designed for investigation of flows in cryogenic helium fluids. The current device allows the levitation of a superconducting sphere and has several provisions made for allowing precise control over its motion. We report on progress in the detection and control systems of the prototype and demonstrate how uniform circular motion can be implemented.