Princeton Magnetorotational Instability Experiment --- Background and Overview

Details Princeton Magnetorotational Instability Experiment --- Background and Overview Princeton Magnetorotational Instability Experiment --- Background and Overview

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..dppep1004j&link_type=abstract

American Physical Society, 46th Annual Meeting of the Division of Plasma Physics, 15-19 November, 2004, Savannah, GA. MEETING I

Physics

Plasma Physics

Scientific paper

The magnetorotational instability (MRI) has been proposed as a dominant mechanism for rapid angular momentum transport in electrically-conducting accretion disks ranging from quasars and X-ray binaries to cataclysmic variables and perhaps even protoplanetary disks. Despite its popularity, however, the MRI has never been clearly demonstrated and studied in the laboratory. Based on theoretical analysis(H. Ji, J. Goodman, and A. Kageyama, Mon. Not. Roy. Astron. Soc. 325), L1(2001); J. Goodman and H. Ji, J. Fluid Mech. 462, 365(2002). and the results from prototype water experiments and hydrodynamic simulations(A. Kageyama, et al.), to be published in J. Phys. Soc. Jpn. (2004)., we have constructed a short Couette flow apparatus with two differentially rotating rings at each end of the flow to minimize the Ekman effect. Liquid gallium alloy is used after initial water tests. A computer-based control and data acquisition system is implemented to achieve reliable operations. Signatures of the MRI are monitored by diagnostics measuring torque coupling between rotating components, as well as magnetic and pressure perturbations, and internal velocity. Our main objectives are (1) to clearly demonstrate MRI; (2) to study its nonlinear behavior and angular momentum transport; (3) to compare with state-of-the-art simulations similar to those used in astrophysical disks. This work is supported by DoE, NSF, and NASA.

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