Bulletin of the American Physical Society
56th Annual Meeting of the APS Division of Plasma Physics
Volume 59, Number 15
Monday–Friday, October 27–31, 2014; New Orleans, Louisiana
Session BI2: Space, Astro, and Lab Astro
9:30 AM–12:30 PM,
Monday, October 27, 2014
Chair: Amitava Bhattacharjee, Princeton Plasma Physics Laboratory
Abstract ID: BAPS.2014.DPP.BI2.1
Abstract: BI2.00001 : Turbulent amplification of magnetic fields in the laboratory*
9:30 AM–10:00 AM
Preview Abstract Abstract
(University of Oxford)
Magnetic fields exist ubiquitously in the Universe, as revealed by either diffuse radio-synchrotron emission, or Faraday rotation observations, with strengths from a few nG to tens of $\mu$G. The energy density of these fields is typically comparable to the energy density of the fluid motions of the plasma in which they are embedded, making magnetic fields essential players in the dynamics of the luminous matter in the Universe. At present, the origin and the distribution of the magnetic fields are far from being understood. The standard model for the origin of these intergalactic magnetic fields is through the amplification of seed fields via turbulent processes to the level consistent with current observations. We have conducted a series of laboratory experiments using high power laser facilities [1,2] to exploit the scale invariance of the magneto-hydrodynamics equations. While the scaling is not perfect (e.g., in what concerns dissipation coefficients such as resistivity or viscosity), the similarity is sufficiently close to make such experiments interesting -- and the results have been showing up the fundamental physical process at play. Our results indicate the magnetic field is indeed amplified by turbulent mechanisms. We relate our findings with processes occurring in supernova remnants and in cluster of galaxies. These experiments provide an example of magnetic field amplification by turbulence in plasmas, a physical process thought to occur in many astrophysical phenomena. \\[4pt]  G. Gregori et al., Nature 481, 480 (2012);\\[0pt]  J. Meinecke et al., Nature Phys. 10, 520 (2014).
*The research leading to these results has received funding from the European Research Council under the European Community's Seventh Framework Programme (FP7/2007-2013) / ERC grant agreement no. 256973.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2014.DPP.BI2.1
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