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Title: Identification of a non-axisymmetric mode in laboratory experiments searching for standard magnetorotational instability

Journal Article · · Nature Communications

Abstract The standard magnetorotational instability (SMRI) is a promising mechanism for turbulence and rapid accretion in astrophysical disks. It is a magnetohydrodynamic (MHD) instability that destabilizes otherwise hydrodynamically stable disk flow. Due to its microscopic nature at astronomical distances and stringent requirements in laboratory experiments, SMRI has remained unconfirmed since its proposal, despite its astrophysical importance. Here we report a nonaxisymmetric MHD instability in a modified Taylor-Couette experiment. To search for SMRI, a uniform magnetic field is imposed along the rotation axis of a swirling liquid-metal flow. The instability initially grows exponentially, becoming prominent only for sufficient flow shear and moderate magnetic field. These conditions for instability are qualitatively consistent with SMRI, but at magnetic Reynolds numbers below the predictions of linear analyses with periodic axial boundaries. Three-dimensional numerical simulations, however, reproduce the observed instability, indicating that it grows linearly from the primary axisymmetric flow modified by the applied magnetic field.

Research Organization:
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Sponsoring Organization:
USDOE; National Aeronautics and Space Administration (NASA); National Science Foundation (NSF); Max-Planck-Princeton Center for Plasma Physics (MPPC)
Grant/Contract Number:
AC02-09CH11466; NNH15AB25I; AST-2108871
OSTI ID:
1880388
Alternate ID(s):
OSTI ID: 1887982
Journal Information:
Nature Communications, Journal Name: Nature Communications Vol. 13 Journal Issue: 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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  • Oishi, Jeffrey S.; Vasil, Geoffrey M.; Baxter, Morgan
  • Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 476, Issue 2233 https://doi.org/10.1098/rspa.2019.0622
journal January 2020
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