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We numerically model experiments in which large-scale vortex rings - bundlesof quantized vortex loops - are created in superfluid helium by apiston-cylinder arrangement. We show that the presence of a normal fluid vortexring together with the quantized vortices is essential to explain the coherenceof these large-scale vortex structures at nonzero temperatures, as observedexperimentally. Finally we argue that the interaction of superfluid and normalfluid vortex bundles is relevant to recent investigations of superfluidturbulence.

Large-scale superfluid vortex rings at nonzero temperatures