Reconnections of quantized vortex rings in superfluid ${}^4$He at very low temperatures

Abstract

Collisions in a beam of unidirectional quantized vortex rings of nearly identical radii $R$ in superfluid ${}^4$He in the limit of zero temperature (0.05 K) were studied using time-of-flight spectroscopy. Reconnections between two primary rings result in secondary vortex loops of both smaller and larger radii. Discrete steps in the distribution of flight times, due to the limits on the earliest possible arrival times of secondary loops created after either one or two consecutive reconnections, are observed. The density of primary rings was found to be capped at the value $500{\mathrm{cm}}^{-2}{R}^{-1}$ independent of the injected density. This is due to collisions between rings causing piling-up of many other vortex rings. Both observations are in quantitative agreement with our theory.

7 pages, 4 figures, includes supplementary material

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Cited by in corpus (11)

• Crossover from interaction to driven regimes in quantum vortex reconnections
• Helicity conservation under quantum reconnection of vortex rings
• Friction-enhanced lifetime of bundled quantum vortices
• Vortex Nucleation Limited Mobility of Free Electron Bubbles in the Gross-Pitaevskii Model of a Superfluid
• Interactions between unidirectional quantized vortex rings
• Visualization of quantum turbulence in superfluid ${}^3$He-B: Combined numerical/experimental study of Andreev reflection
• A note on the propagation of quantized vortex rings through a quantum turbulence tangle: Energy transport or energy dissipation?
• Three-dimensional stability of leapfrogging quantum vortex rings
• Scattering of Line-Ring Vortices in a Superfluid
• Instability of a Vortex Ring due to Toroidal Normal Fluid Flow in Superfluid 4He
• Regimes of turbulence without an energy cascade