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Visualization using tracer particles is a relatively new tool available forthe study of superfluid turbulence and flow, which is applied here tooscillating objects submerged in the liquid. We report observations of astructure seen in videos taken from outside a cryostat filled with superfluidhelium at 2 K, which is possibly a vortex loop attached to an oscillator. Thefeature, which has the shape of an incomplete arch, is visualized due to thepresence of solid H2 tracer particles and is attached to a beam oscillating at38 Hz in the liquid. It has been recorded in videos taken at 240 frames persecond (FPS), fast enough to take around 6 images per period. This makes itpossible to follow the structure, and to see that is not rigid. It moves withrespect to the oscillator, and its displacement is in phase with the velocityof the moving beam. Analyzing the motion, we come to the conclusion that we maybe observing a superfluid vortex attached to the beam and decorated by thehydrogen particles. An alternative model, considering a solid hydrogenfilament, has also been analyzed, but the observed phase between the movementof the beam and the filamentary structure is better explained by the superfluidvortex hypothesis.

Possible visualization of a superfluid vortex loop attached to an oscillating beam