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Abstract
Magnetic fields are ubiquitous in the Universe. 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. The standard theoretical model for the origin of these strong magnetic fields is through the amplification of tiny seed fields via turbulent dynamo to the level consistent with current observations. However, experimental demonstration of the turbulent dynamo mechanism has remained elusive, since it requires plasma conditions that are extremely hard to re-create in terrestrial laboratories. Here we demonstrate, using laser-produced colliding plasma flows, that turbulence is indeed capable of rapidly amplifying seed fields to near equipartition with the turbulent fluid motions. These results support the notion that turbulent dynamo is a viable mechanism responsible for the observed present-day magnetization.
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1 Department of Physics, University of Oxford, Oxford, UK; Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL, USA
2 Department of Physics, University of Oxford, Oxford, UK
3 Rutherford Appleton Laboratory, Didcot, UK; Department of Physics, University of Strathclyde, Glasgow, UK
4 CEA, DAM, DIF, Arpajon, France
5 Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL, USA
6 Max Planck Institute for Astrophysics, Garching, Germany; Space Research Institute (IKI), Moscow, Russia
7 Lawrence Livermore National Laboratory, Livermore, CA, USA
8 SLAC National Accelerator Laboratory, Menlo Park, CA, USA
9 Physics Department, University of Wisconsin-Madison, Madison, WI, USA
10 AWE, Aldermaston, Reading, UK
11 Laboratory for Laser Energetics, University of Rochester, Rochester, NY, USA
12 Laboratoire pour l’Utilisation de Lasers Intenses, UMR7605, CNRS CEA, Université Paris VI Ecole Polytechnique, Palaiseau Cedex, France
13 Massachusetts Institute of Technology, Cambridge, MA, USA
14 Department of Physics, UNIST, Ulsan, Korea
15 School of Mathematics and Physics, Queens University Belfast, Belfast, UK
16 Department of Physics, ETH Zürich, Zürich, Switzerland