A Review of the Current Status of MRI Laboratory Studies

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The Magnetorotational instability (MRI) is sufficiently generic that it should be producible in laboratory experiments. This talk will discuss the latest results from three liquid-metal studies of the MRI, and how those results may apply to astrophysical settings. The results of the first group to claim observation of the MRI, using the Maryland spherical Couette experiment, will be described. The reported observations were in the presence of a turbulent background state, and were non-axisymmetric, in contrast to the expected behavior. The PROMISE experiment group has reported the observation of the Helical MRI in their Taylor-Couette experiment, in which a combined axial-azimuthal magnetic field is applied to the flow. The important role of boundary conditions will be discussed in the context of this experiment. Finally, the latest results from the Princeton MRI experiment will be presented. This experiment is capable of generating high-Reynolds-number laminar flows, allowing, in principle, the observation of the MRI to the exclusion of other instabilities.

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