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Title: Developed turbulence and nonlinear amplification of magnetic fields in laboratory and astrophysical plasmas

The visible matter in the universe is turbulent and magnetized. Turbulence in galaxy clusters is produced by mergers and by jets of the central galaxies and believed responsible for the amplification of magnetic fields. We report on experiments looking at the collision of two laser-produced plasma clouds, mimicking, in the laboratory, a cluster merger event. By measuring the spectrum of the density fluctuations, we infer developed, Kolmogorov-like turbulence. From spectral line broadening, we estimate a level of turbulence consistent with turbulent heating balancing radiative cooling, as it likely does in galaxy clusters. We show that the magnetic field is amplified by turbulent motions, reaching a nonlinear regime that is a precursor to turbulent dynamo. Thus, our experiment provides a promising platform for understanding the structure of turbulence and the amplification of magnetic fields in the universe.
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [4] ;  [5] ;  [6] ;  [1] ; ORCiD logo [7] ;  [4] ;  [8] ;  [9] ;  [7] ;  [10] ;  [7] ;  [6] ;  [4] ;  [11] ;  [12] ;  [8] more »;  [13] ;  [14] ;  [7] ;  [6] ;  [8] ;  [15] ;  [1] ;  [2] ;  [16] « less
  1. Univ. of Oxford (United Kingdom)
  2. Univ. of Chicago, IL (United States)
  3. Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab. (RAL); Univ. of Strathclyde, Glasgow (United Kingdom)
  4. Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab. (RAL)
  5. Max Planck Society, Garching (Germany). Max Planck Inst. for Astrophysics; Space Research Inst., Moscow (Russia)
  6. Univ. of York (United Kingdom)
  7. Univ. of Michigan, Ann Arbor, MI (United States)
  8. Univ. Paris Ecole Polytechnique, Palaiseau (France)
  9. Osaka Univ. (Japan); National Central Univ., Taoyuan (Taiwan)
  10. Univ. of California, Santa Cruz, CA (United States)
  11. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  12. Univ. Paris Ecole Polytechnique, Palaiseau (France); Helmholtz-Zentrum Dresden-Rossendorf, (Germany)
  13. Queen's Univ., Belfast, Northern Ireland (United Kingdom)
  14. Osaka Univ. (Japan)
  15. ETH Zurich (Switzerland)
  16. Univ. of Oxford (United Kingdom); Univ. of Chicago, IL (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-742436
Journal ID: ISSN 0027-8424
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Volume: 112; Journal Issue: 27; Journal ID: ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 79 ASTRONOMY AND ASTROPHYSICS; 70 PLASMA PHYSICS AND FUSION; Galaxy clusters; laboratory analogues; lasers; magnetic fields; turbulence
OSTI Identifier:
1414370