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Title: Detailed characterization of laser-produced astrophysically-relevant jets formed via a poloidal magnetic nozzle

We report that the collimation of astrophysically-relevant plasma ejecta in the form of narrow jets via a poloidal magnetic field is studied experimentally by irradiating a target situated in a 20 T axial magnetic field with a 40 J, 0.6 ns, 0.7 mm diameter, high-power laser. The dynamics of the plasma shaping by the magnetic field are studied over 70 ns and up to 20 mm from the source by diagnosing the electron density, temperature and optical self-emission. These show that the initial expansion of the plasma is highly magnetized, which leads to the formation of a cavity structure when the kinetic plasma pressure compresses the magnetic field, resulting in an oblique shock [A. Ciardi et al., Phys. Rev. Lett. 110, 025002 (2013)]. The resulting poloidal magnetic nozzle collimates the plasma into a narrow jet [B. Albertazzi et al., Science 346, 325 (2014)]. At distances far from the target, the jet is only marginally magnetized and maintains a high aspect ratio due to its high Mach-number (M~20) and not due to external magnetic pressure. The formation of the jet is evaluated over a range of laser intensities (10 12–10 13 W/cm 2), target materials and orientations of the magnetic field.more » Lastly, plasma cavity formation is observed in all cases and the viability of long-range jet formation is found to be dependent on the orientation of the magnetic field.« less
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9] ;  [10] ;  [11] ;  [12] ;  [13] ;  [4] ;  [14] ;  [15] ;  [16] ;  [13] ;  [17] ;  [17] more »;  [18] ;  [5] ;  [3] ;  [8] « less
  1. LULI CNRS, Ecole Polytechnique, CEA: Universite Paris-Saclay, UPMC Univ Paris 06: Sorbonne Universites (France); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. LULI CNRS, Ecole Polytechnique, CEA: Universite Paris-Saclay, UPMC Univ Paris 06: Sorbonne Universites (France); Institute of Applied Physics (Russia)
  3. Sorbonne Universites, Paris (France); PSL Research University, CNRS, Paris (France). LERMA, Observatoire de Paris
  4. LNCMI, UPR 3228, CNRS-UGA-UPS-INSA (France)
  5. Institut fur Laser und Plasmaphysik, Heinrich-Heine-Universitat Dusseldorf (Germany)
  6. The Queens University of Belfast (United Kingdom); Institute of Physics of the ASCR, ELI-Beamlines project (Czech Republic)
  7. Institute of Applied Physics (Russia)
  8. LULI CNRS, Ecole Polytechnique, CEA: Universite Paris-Saclay, UPMC Univ Paris 06: Sorbonne Universites (France); Institute of Applied Physics (Russia)
  9. Joint Institute for High Temperatures, Moscow (Russia); National Research Nuclear University MEPhI, Moscow (Russia)
  10. GSI Helmholtzzentrum fur Schwerionenforschung GmbH (Germany)
  11. The Queens University of Belfast (United Kingdom)
  12. INRS-EMT, Quebec (Canada)
  13. Joint Institute for High Temperatures, Moscow (Russia); National Research Nuclear University MEPhI, Moscow (Russia)
  14. LULI, Sorbonne Universites UPMC Univ. Paris 06, Ecole Polytechnique, CNRS, CEA, Paris (France)
  15. LULI CNRS, Ecole Polytechnique, CEA: Universite Paris-Saclay, UPMC Univ Paris 06: Sorbonne Universites (France); CEA, DAM, DIF (France)
  16. Joint Institute for High Temperatures, RAS, Moscow (Russia); M. V. Lomonosov Moscow State University, Moscow (Russia)
  17. Institute of Applied Physics, RAS (Russia)
  18. LULI CNRS, Ecole Polytechnique, CEA: Universite Paris-Saclay, UPMC Univ Paris 06: Sorbonne Universites (France)
Publication Date:
Report Number(s):
LLNL-JRNL-679787
Journal ID: ISSN 1574-1818
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
High Energy Density Physics
Additional Journal Information:
Journal Volume: 23; Journal Issue: C; Journal ID: ISSN 1574-1818
Publisher:
Elsevier
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; 70 PLASMA PHYSICS AND FUSION; Magnetohydrodynamics; Astrophysical plasmas; Laser-plasma interactions; Jets; Outflows
OSTI Identifier:
1357399
Alternate Identifier(s):
OSTI ID: 1397414