Pinning of vortices in nucleopores. Effect on second-sound resonators

d’Humières, D.; Launay, A.; Libchaber, Albert

doi:10.1007/bf00115276

Cited by 50 publications

(3 citation statements)

References 8 publications

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“…11 The behavior of the whole resonator has been calculated with use of transmission-line theory following d'Humieres, Launay, and Libchaber. 12,13 The ratio of output to input voltage is given in terms of a complex wave vector, k, as iDe i0 e-ikL \-r 2 e-2ikL '…”

mentioning

confidence: 99%

Viscosity of a Spin-PolarizedHe3-He
Owers‐Bradley¹,
Main
²
,
Church
³

et al. 1988
Phys. Rev. Lett.
61
0
7
1
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We have made the first systematic observations of an increase in the viscosity of a dilute 3 He-4 He solution at very low temperatures on the application of a large magnetic field by measuring the damping of second sound. The zero-field viscosities are used to evaluate the quasiparticle-quasiparticle interaction potential which enables an unambiguous prediction of the viscosity increase. The experimental results are in good agreement with this prediction.

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mentioning

confidence: 99%

Viscosity of a Spin-PolarizedHe3-He
Owers‐Bradley¹,
Main
²
,
Church
³

et al. 1988
Phys. Rev. Lett.
61
0
7
1
View full text Add to dashboard Cite

show abstract

“…They are based on a vibrating porous membrane that is coupled to the motion of normal fluid by viscous forces, and uncoupled to the inviscid superfluid. They can be manufactured by replacing the membrane of a loudspeaker or microphone by a millipore or a nucleopore sheet [WBF + 69, SE70,DLL80].…”

Section: Figurementioning

confidence: 99%

“…millipore or nucleopore membranes). In this case, the effect of vortices pinned on the surface may no longer be negligible ; for a discussion see [DLL80].…”

Section: Summary and Perspectivesmentioning

confidence: 99%

Second sound resonators and tweezers as vorticity or velocity probes : fabrication, model and method

Woillez¹,

Valentin²,

Roche³

2023

Preprint

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An analytical model of second-sound resonators with open-cavity is presented and validated against simulations and experiments in superfluid helium using a new design of resonators reaching unprecedented resolution. The model accounts for diffraction, geometrical misalignments and flow through the cavity. It is validated against simulations and experiments using cavities of aspect ratio of the order of unity operated up to their 20 th resonance in superfluid helium. An important result is that resonators can be optimized to selectively sense the quantum vortex density carried by the throughflow -as customarily done in the literature-or alternatively to sense the mean velocity of this throughflow. Two velocity probing methods are proposed, one taking advantage of geometrical misalignements between the tweezers plates, and another one by driving the resonator non-linearly, beyond a threshold entailing the self-sustainment of a vortex tangle within the cavity.After reviewing several methods, a new mathematical treatment of the resonant signal is proposed, to properly separate the quantum vorticity from the parasitic signals arising for instance from temperature and pressure drift. This so-called elliptic method consists in a geometrical projection of the resonance in the inverse complex plane. Its strength is illustrated over a broad range of operating conditions.The resonator model and the elliptic method are applied to characterize a new design of second-sound resonator of high resolution thanks to miniaturization and design optimization. When immersed in a superfluid flow, these so-called second-sound tweezers provide time-space resolved information like classical local probes in turbulence, here down to sub-millimeter and sub-millisecond scales. The principle, design and micro-fabrication of second sound tweezers are detailed, as well as their potential for the exploration of quantum turbulence Contents * present affiliation: CEA-Liten, Grenoble

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Superleak transducers of second sound in3He-4He mixtures

Henjes

Liu

1991

J Low Temp Phys

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Pinning of vortices in nucleopores. Effect on second-sound resonators

Abstract: Superleak second-sound transducers, used to measure superfluid turbulence in a cavity, exhibit complex phenomena associated with vortex pinning at the pore sites. These phenomena could be used to study vortex pinning and motion in nucleopores.

Cited by 50 publications

References 8 publications

Viscosity of a Spin-PolarizedHe3-He
Owers‐Bradley¹,
Main
²
,
Church
³

et al. 1988
Phys. Rev. Lett.
61
0
7
1
View full text Add to dashboard Cite

Viscosity of a Spin-PolarizedHe3-He
Owers‐Bradley¹,
Main
²
,
Church
³

et al. 1988
Phys. Rev. Lett.
61
0
7
1
View full text Add to dashboard Cite

Second sound resonators and tweezers as vorticity or velocity probes : fabrication, model and method

Superleak transducers of second sound in3He-4He mixtures

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Pinning of vortices in nucleopores. Effect on second-sound resonators

Abstract: Superleak second-sound transducers, used to measure superfluid turbulence in a cavity, exhibit complex phenomena associated with vortex pinning at the pore sites. These phenomena could be used to study vortex pinning and motion in nucleopores.

Cited by 50 publications

References 8 publications

Viscosity of a Spin-PolarizedHe3-HeOwers‐Bradley1, Main2, Church3 et al. 1988Phys. Rev. Lett.61071View full textAdd to dashboardCite

Viscosity of a Spin-PolarizedHe3-HeOwers‐Bradley1, Main2, Church3 et al. 1988Phys. Rev. Lett.61071View full textAdd to dashboardCite

Second sound resonators and tweezers as vorticity or velocity probes : fabrication, model and method

Superleak transducers of second sound in3He-4He mixtures

Contact Info

Product

Resources

About

Viscosity of a Spin-PolarizedHe3-He
Owers‐Bradley¹,
Main
²
,
Church
³

et al. 1988
Phys. Rev. Lett.
61
0
7
1
View full text Add to dashboard Cite

Viscosity of a Spin-PolarizedHe3-He
Owers‐Bradley¹,
Main
²
,
Church
³

et al. 1988
Phys. Rev. Lett.
61
0
7
1
View full text Add to dashboard Cite