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Vortex generation in superfluid He-3 by a vibrating grid.

Research output: Contribution to journalJournal article

Published

Journal publication date01/2004
JournalJournal of Low Temperature Physics
Journal number1-2
Volume134
Number of pages6
Pages381-386
Original languageEnglish

Abstract

Recently we have found that a vibrating wire resonator produces turbulence in superfluid He-3-B at low temperatures when driven above its pair-breaking critical velocity. The vorticity is produced along with a beam of excitations from pair breaking. Here, we discuss preliminary measurements of turbulence generated from an oscillating grid at low temperatures. The grid oscillator is made from a goal-post shaped vibrating wire resonator supporting a fine copper mesh. While the dissipation by a conventional wire resonator is dominated by pair-breaking at the velocities required for turbulence generation, the dissipation of the grid oscillator appears to be dominated by turbulence. This allows us to generate turbulence without the unwanted effects of a quasiparticle beam. Preliminary measurements suggest that the grid turbulence has a rather different behaviour from that generated by conventional wire resonators.