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The dynamics of vortex generation in superfluid He-B

Journal of Low Temperature Physics, ISSN: 0022-2291, Vol: 153, Issue: 5-6, Page: 197-227
2008
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Conference Paper Description

A profound change occurs in the stability of quantized vortices in externally applied flow of superfluid He-B at temperatures ≲0.6 T , owing to the rapidly decreasing damping in vortex motion with decreasing temperature. At low damping an evolving vortex may become unstable and generate a new independent vortex loop. This single-vortex instability is the generic precursor of turbulence. We investigate the instability with non-invasive NMR measurements on a rotating cylindrical sample in the intermediate temperature regime (0.3-0.6)-T . From comparisons with numerical calculations we interpret that the instability occurs at the container wall, when the vortex end moves along the wall in applied flow. © Springer Science+Business Media, LLC 2008.

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