Physics – Plasma Physics
Scientific paper
Nov 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aps..dppup6037s&link_type=abstract
American Physical Society, 50th Annual Meeting of the Division of Plasma Physics, November 17-21, 2008, abstract #UP6.037
Physics
Plasma Physics
Scientific paper
A turbulent viscosity is required to explain the observationally-inferred rates of angular momentum transport in accretion disks. Investigation of thin disks has focused on two sources of instability to drive the turbulence: the MagnetoRotational Instability (MRI) and Subcritical Hydrodynamic Instability (SHI). In MRI a weak ambient magnetic field causes the radially-decreasing angular velocity to become a source of free energy. In SHI, stable perturbations allow access to unstable modes. This experiment investigates both of these instabilities in a Couette-Taylor flow. Using water or liquid Gallium alloy we generate rotating shear flows with linear stability properties analagous to astrophysical disks. Differentially rotatable end-rings reduce boundary effects. We found no evidence of SHI, up to Reynolds number of order one million. During the MHD experiments a solenoidal magnetic field of up to 5 kG is applied. Radially-aligned induction coils detect magnetic perturbations generated by the liquid metal. Initial magnetized experiments focussed on magneto-Coriolis waves which at large magnetic Reynolds number are expected to transition into MRI modes. Results of the current search for the MRI will be presented.
Burin Michael J.
Coster D.
Goodman Jeremy
Ji Tae H.
Liu Wende
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