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Fluctuations and correlations of pure quantum turbulence in superfluid He-3_B.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

<mark>Journal publication date</mark>8/08/2008
<mark>Journal</mark>Physical review letters
Issue number6
Number of pages0
Pages (from-to)065302
Publication StatusPublished
<mark>Original language</mark>English


We describe the first measurements of line-density fluctuations and spatial correlations of quantum turbulence in superfluid He-3-B. All of the measurements are performed in the low-temperature regime, where the normal-fluid density is negligible. The quantum turbulence is generated by a vibrating grid. The vortex-line density is found to have large length-scale correlations, indicating large-scale collective motion of vortices. Furthermore, we find that the power spectrum of fluctuations versus frequency obeys a -5/3 power law which verifies recent speculations that this behavior is a generic feature of fully developed quantum turbulence, reminiscent of the Kolmogorov spectrum for velocity fluctuations in classical turbulence.