Study of Magnetorotational Instability and MHD Surface Waves in Liquid Gallium

Details Study of Magnetorotational Instability and MHD Surface Waves in Liquid Gallium Study of Magnetorotational Instability and MHD Surface Waves in Liquid Gallium

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..dppgp1059j&link_type=abstract

American Physical Society, 44th Annual Meeting of the Division of Plasma , abstract #GP1.059

Astronomy and Astrophysics

Astrophysics

Scientific paper

Two liquid gallium experiments have been constructed in PPPL to study basic MHD physics related to astrophysics and fusion sciences. The first experiment focuses on laboratory studies of the magnetorotational instability (MRI) in a rotating gallium disk or a short Couette flow geometry. The MRI has been proposed as a dominant mechanism for fast angular momentum transport in electrically-conducting accretion disks ranging from quasars and X-ray binaries to cataclysmic variables and perhaps even protoplanetary disks. Experiments using a prototype water disk has revealed importance of Ekman circulation, consistent with 2D hydrodynamic simulations. A revised design using multiple rings at each end of the flow are being implemented. The second experiment focuses on MHD surface waves in a large liquid gallium pool. It has been found that the damping rates of driven 1D surface waves propogating along a magnetic field are consistent with linear theory. The parametric excitation of 2D surface waves is being studied to elucidate effects of a horizonally imposed magnetic field on the dynamics of pattern formation. Detailed results will be presented for both experiments and implications to astrophysics and to the liquid metal wall concept in fusion reactors will be discussed. This work is supported by DoE.

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