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Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Hysteresis, switching and anomalous behaviour of a quartz tuning fork in superfluid 4He
AU - Bradley, Ian
AU - Fear, Matthew
AU - Fisher, Shaun
AU - Guénault, Tony
AU - Haley, Richard
AU - Lawson, Christopher
AU - Pickett, George
AU - Schanen, Roch
AU - Tsepelin, Viktor
AU - Wheatland, Louise
N1 - This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.
PY - 2014/4
Y1 - 2014/4
N2 - We have been studying the behaviour of commercial quartz tuning forks immersed in superfluid 4He and driven at resonance. For one of the forks we have observed hysteresis and switching between linear and non-linear damping regimes at temperatures below 10 mK. We associate linear damping with pure potential flow around the prongs of the fork, and non-linear damping with the production of vortexlines in a turbulent regime. At appropriate prong velocities, we have observedmetastability of both the linear and the turbulent flow states, and a region of intermittency where the flow switched back and forth between each state. For the same fork, we have also observed anomalous behaviour in the linear regime, with large excursions in both damping, resonant frequency, and the tip velocity as a function of driving force.
AB - We have been studying the behaviour of commercial quartz tuning forks immersed in superfluid 4He and driven at resonance. For one of the forks we have observed hysteresis and switching between linear and non-linear damping regimes at temperatures below 10 mK. We associate linear damping with pure potential flow around the prongs of the fork, and non-linear damping with the production of vortexlines in a turbulent regime. At appropriate prong velocities, we have observedmetastability of both the linear and the turbulent flow states, and a region of intermittency where the flow switched back and forth between each state. For the same fork, we have also observed anomalous behaviour in the linear regime, with large excursions in both damping, resonant frequency, and the tip velocity as a function of driving force.
KW - Superfluid He-4
KW - Tuning fork
KW - Critical velocity
KW - Turbulence
U2 - 10.1007/s10909-013-0931-5
DO - 10.1007/s10909-013-0931-5
M3 - Journal article
VL - 175
SP - 379
EP - 384
JO - Journal of Low Temperature Physics
JF - Journal of Low Temperature Physics
SN - 0022-2291
IS - 1-2
ER -