Precessing Vortex Motion and Instability in a Rotating Column of Superfluid 3He-B
In a rotating circular cylinder of superfluid 3 He-B, an evolving vortex expands longitudinally such that its end point describes a helically spiralling trajectory along the cylinder wall. The spiral motion is found to give rise to a periodically oscillating NMR signal, which is brought about by the...
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Veröffentlicht in: | Journal of low temperature physics 2009-04, Vol.155 (1-2), p.98-113 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | In a rotating circular cylinder of superfluid
3
He-B, an evolving vortex expands longitudinally such that its end point describes a helically spiralling trajectory along the cylinder wall. The spiral motion is found to give rise to a periodically oscillating NMR signal, which is brought about by the modulation in the superfluid counterflow and its influence on the “flare-out” order parameter texture. The new NMR signal becomes observable within a narrow temperature interval close to the onset temperature of turbulence, when new vortices are continuously generated by the single-vortex instability at the cylindrical wall at a slow rate, ∼1 vortex/s. We use numerical vortex filament calculations to examine the precessing motion of the evolving vortices, while they expand towards their stable state as rectilinear line vortices. |
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ISSN: | 0022-2291 1573-7357 |
DOI: | 10.1007/s10909-009-9873-3 |