Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprd11008b&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
A magnetic dynamo experiment is under construction at the New Mexico Institute of Mining and Technology. The experiment is designed to demonstrate in the laboratory the alpha-omega magnetic dynamo, which is believed to operate in many rotating and conducting astrophysical objects. The experiment uses the Couette flow of liquid sodium between two cylinders rotating with different angular velocities to model the omega-effect. The alpha-effect is created by the rising and expanding jets of liquid sodium driven through a pair of orifices in the end plates of the cylindrical vessel. The driven jets simulate plumes driven by buoyancy either within stars or from star-disk collisions in AGN accretion disks. A water analog of the dynamo device has been constructed and the flow necessary for the dynamo has been demonstrated. Numerical simulations of the kinematic dynamo predict that the toroidal field produced by the omega-effect will be B_phi (R_m/2pi) B_poloidal 20 x B_poloidal for the expected magnetic Reynolds number of Rm 120. The critical rate of jets necessary for the dynamo self-excitation is predicted to be a pair of jets every 4 revolutions of the outer cylinder. Within the limitations on the strength of materials and the power of the drive, the self-excitation of the dynamo appears to be feasible.
Beckley Howard
Colgate Stirling
Pariev Vladimir
Weatherall James
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