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• W4316173772 abstract "An analytical model of open-cavity second sound resonators is presented and validated against simulations and experiments in superfluid helium using a new resonator design that achieves unprecedented resolution. The model incorporates diffraction, geometrical misalignments, and flow through the cavity and is validated using cavities operated up to their 20th resonance in superfluid helium. An important finding is that resonators can be optimized to selectively sense either the quantum vortex density carried by the throughflow-as typically done in the literature-or the mean velocity of the throughflow. We propose two velocity probing methods: one that takes advantage of misalignments between the tweezers' plates and other that drives the resonator non-linearly, beyond a threshold that results in the self-sustainment of a vortex tangle within the cavity. A new mathematical treatment of the resonant signal is proposed to adequately filter out parasitic signals, such as temperature and pressure drift, and accurately separate the quantum vorticity signal. This elliptic method consists in a geometrical projection of the resonance in the inverse complex plane. Its effectiveness is demonstrated over a wide range of operating conditions. The resonator model and elliptic method are being utilized to characterize a new design of resonators with high resolution, thanks to miniaturization and design optimization. These second-sound tweezers are capable of providing time-space resolved information similar to classical local probes in turbulence, down to sub-millimeter and sub-millisecond scales. The principle, design, and microfabrication of second sound tweezers are being presented, along with their potential for exploring quantum turbulence." @default.
• W4316173772 created "2023-01-15" @default.
• W4316173772 creator A5027317816 @default.
• W4316173772 creator A5056963348 @default.
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• W4316173772 date "2023-10-01" @default.
• W4316173772 modified "2023-10-16" @default.
• W4316173772 title "Second sound resonators and tweezers as vorticity or velocity probes: Fabrication, model, and method" @default.
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• W4316173772 doi "https://doi.org/10.1063/5.0152091" @default.
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• W4316173772 hasPublicationYear "2023" @default.
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