Rights statement: Copyright 2012 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Low Temperature Physics, 38 (11), 2012 and may be found at http://link.aip.org/link/?APPLAB/90/172106/1.
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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
}
TY - JOUR
T1 - Mutual interactions between objects oscillating in isotopically pure superfluid He-4 in the T -> 0 limit
AU - Garg, D.
AU - Efimov, V. B.
AU - Giltrow, M.
AU - McClintock, P. V. E.
AU - Skrbek, L.
N1 - Copyright 2012 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Low Temperature Physics, 38 (11), 2012 and may be found at http://link.aip.org/link/?APPLAB/90/172106/1.
PY - 2012/11
Y1 - 2012/11
N2 - We report the results of experiments to explore interactions between physically separated oscillating objects in isotopically pure superfluid He-4 at T similar to 10 mK. The investigations focused mainly on 32 kHz quartz tuning forks, but also consider a nearby 1 kHz oscillating grid. The low-drive linewidth (LDL) and resonant frequency f(d) of a detector fork were monitored while the maximum velocity of a transmitter fork, separated from the detector by a few mm, was varied over a wide range. Clear evidence was found for mutual interactions between the two forks, and for the influence of the grid on the forks. Monitoring the detector's LDL and f(d) provides evidence for a generator critical velocity in the range 0.3 < nu(c1) < 1.0 cm/s for onset of the detector responses, in addition to a second critical velocity nu(c2) similar to 13 cm/s probably corresponding to the production of quantum turbulence at the generator. The results are discussed, but are not yet fully understood. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4765091]
AB - We report the results of experiments to explore interactions between physically separated oscillating objects in isotopically pure superfluid He-4 at T similar to 10 mK. The investigations focused mainly on 32 kHz quartz tuning forks, but also consider a nearby 1 kHz oscillating grid. The low-drive linewidth (LDL) and resonant frequency f(d) of a detector fork were monitored while the maximum velocity of a transmitter fork, separated from the detector by a few mm, was varied over a wide range. Clear evidence was found for mutual interactions between the two forks, and for the influence of the grid on the forks. Monitoring the detector's LDL and f(d) provides evidence for a generator critical velocity in the range 0.3 < nu(c1) < 1.0 cm/s for onset of the detector responses, in addition to a second critical velocity nu(c2) similar to 13 cm/s probably corresponding to the production of quantum turbulence at the generator. The results are discussed, but are not yet fully understood. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4765091]
KW - superfluid helium-4
KW - turbulence
U2 - 10.1063/1.4765091
DO - 10.1063/1.4765091
M3 - Journal article
VL - 38
SP - 1026
EP - 1030
JO - Low Temperature Physics
JF - Low Temperature Physics
SN - 1063-777X
IS - 11
ER -