Jackson, M. J. and Kolosov, O. and Schmoranzer, D. and Skrbek, L. and Tsepelin, V. and Woods, A. J. (2016) Measurements of vortex line density generated by a quartz tuning fork in superfluid $$^{4}$$ 4 He. Journal of Low Temperature Physics, 183 (3). pp. 208-214. ISSN 0022-2291
SecondSoundTuningFork_rev01j.pdf - Accepted Version
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Abstract
We present proof-of-concept measurements of the vortex line density generated by a quartz tuning fork resonator probed by the attenuation of second sound in superfluid 4He at 1.6 K. The force–velocity response of a quartz tuning fork operating at a frequency of 31 kHz exhibited the onset of extra damping at a velocity of 0.5 ms−1. Attenuation of the 5th resonant mode of second sound was observed at the same velocity, indicating the production of vortex lines. Our measurements demonstrate that an increase of the drag coefficient corresponds to the development of quantum turbulence.