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Title: Laboratory measurements of resistivity in warm dense plasmas relevant to the microphysics of brown dwarfs

Since the observation of the first brown dwarf in 1995, numerous studies have led to a better understanding of the structures of these objects. Here we present a method for studying material resistivity in warm dense plasmas in the laboratory, which we relate to the microphysics of brown dwarfs through viscosity and electron collisions. Here we use X-ray polarimetry to determine the resistivity of a sulphur-doped plastic target heated to Brown Dwarf conditions by an ultra-intense laser. The resistivity is determined by matching the plasma physics model to the atomic physics calculations of the measured large, positive, polarization. Furthermore, the inferred resistivity is larger than predicted using standard resistivity models, suggesting that these commonly used models will not adequately describe the resistivity of warm dense plasma related to the viscosity of brown dwarfs.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [3] ;  [4] ;  [5] ;  [6] ;  [5] ;  [5] ;  [7] ;  [1] ;  [4] ;  [8] ;  [9] ;  [1] ;  [4] ;  [3] ;  [3] ;  [3]
  1. STFC Rutherford Appleton Lab., Didcot (United Kingdom)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); ELI Beamlines, Prague (Czech Republic); Univ. of Nevada, Reno, NV (United States)
  3. Univ. of York, Heslington York (United Kingdom)
  4. Queen's Univ. Belfast, Belfast (United Kingdom)
  5. Instituto Nazionale di Ottica, Pisa (Italy)
  6. Univ. of Oxford, Oxford (United Kingdom)
  7. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); ELI Beamlines, Prague (Czech Republic); Instituto Nazionale di Ottica, Pisa (Italy)
  8. Univ. of Nevada, Reno, NV (United States)
  9. STFC Rutherford Appleton Lab., Didcot (United Kingdom); Univ. of York, Heslington York (United Kingdom)
Publication Date:
OSTI Identifier:
1304822
Report Number(s):
LA-UR--14-21902
Journal ID: ISSN 2041-1723
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 6; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
STFC (UK); USDOE
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 79 ASTRONOMY AND ASTROPHYSICS