Your browser doesn't support javascript.
loading
Self-Generated Magnetic and Electric Fields at a Mach-6 Shock Front in a Low Density Helium Gas by Dual-Angle Proton Radiography.
Hua, R; Kim, J; Sherlock, M; Bailly-Grandvaux, M; Beg, F N; McGuffey, C; Wilks, S; Wen, H; Joglekar, A; Mori, W; Ping, Y.
Afiliación
  • Hua R; Center for Energy Research, University of California, San Diego, La Jolla, California 92093, USA.
  • Kim J; Center for Energy Research, University of California, San Diego, La Jolla, California 92093, USA.
  • Sherlock M; Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
  • Bailly-Grandvaux M; Center for Energy Research, University of California, San Diego, La Jolla, California 92093, USA.
  • Beg FN; Center for Energy Research, University of California, San Diego, La Jolla, California 92093, USA.
  • McGuffey C; Center for Energy Research, University of California, San Diego, La Jolla, California 92093, USA.
  • Wilks S; Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
  • Wen H; University of California, Los Angeles, Los Angeles, California 90095, USA.
  • Joglekar A; University of California, Los Angeles, Los Angeles, California 90095, USA.
  • Mori W; University of California, Los Angeles, Los Angeles, California 90095, USA.
  • Ping Y; Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
Phys Rev Lett ; 123(21): 215001, 2019 Nov 22.
Article en En | MEDLINE | ID: mdl-31809125
ABSTRACT
Shocks are abundant both in astrophysical and laboratory systems. While the electric fields generated at shock fronts have recently attracted great attention, the associated self-generated magnetic field is rarely studied, despite its ability to significantly affect the shock profile in the nonideal geometry where density and temperature gradients are not parallel. We report here the observation of a magnetic field at the front of a Mach ∼6 shock propagating in a low-density helium gas system. Proton radiography from different projection angles not only confirms the magnetic field's existence, but also provides a quantitative measurement of the field strength in the range ∼5 to 7 T. X-ray spectrometry allowed inference of the density and temperature at the shock front, constraining the plasma conditions under which the magnetic and electric fields are generated. Simulations with the particle-in-cell code lsp attribute the self-generation of the magnetic field to the Biermann battery effect (∇n_{e}×∇T_{e}).

Texto completo: 1 Banco de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2019 Tipo del documento: Article País de afiliación: Estados Unidos

Texto completo: 1 Banco de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2019 Tipo del documento: Article País de afiliación: Estados Unidos