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The Generation and Decay of Grid Turbulence in a Dissipationless Fluid--4He at 20 mK

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Turbulence produced by a towed-grid in liquid 4He at very low temperatures is predicted to decay not by viscous losses, as occurs when there is mutual friction between the superfluid and normal fluid, but by phonon radiation when the energy flows into smaller length scales by a kind of Kelvin-wave cascade on the quantized vortex lines making up the turbulence. Great efforts have been expended to create and detect turbulence in helium at very low temperatures. This talk will concentrate on the progress made, especially in the design and construction of superconducting actuators and small temperature and pressure sensors. Some results with a vibrating grid may be presented.

This talk is part of the Quantum Matter Seminar series.

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