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Accueil du site > Évènements > Séminaires > Séminaires IRPHE > Archives IRPHE > 2022

Vendredi 25 Mars 2022 / IRPHE

publié le

Séminaire IRPHE

Quantum vortices in helium II decorated with solid dihydrogen particles

Orateur : Mathieu Gibert / Institut NEEL

Abstract : Quantum vortices in helium II are the building block of all superfluid flows. At the Institut Néel, we have developed the only cryostat in the world today capable of decorating vortices with micron-sized particles of solid dihydrogen under controlled and reproducible experimental conditions. This device allows us to study these quantum objects by direct visualization. Using 3 fast cameras and a sensitive high resolution camera, we are able to reconstruct the trajectories of the dihydrogen flakes trapped on the core of the vortices. Furthermore, the cryostat and instrumentation are mounted on a rotating table, which allows the generation and study of vortex arrays aligned with the rotation axis. This canonical state (analogous to the Abrikosov lattice in superconductivity) is used as the basic configuration in all flows we consider. In this presentation, we will briefly describe the setup and present the first results : study of the regular lattice as a function of the rotation rate (verification of Feynman’s rule), study of the waves propagating along vortices forced by a thermal counter-flow and visualisation of vortex/vortex reconnections.

Date et lieu : vendredi 25/03 à 11h en salle de séminaire IRPHE.

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