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.

doi:10.1103/PhysRevLett.123.215001

Title: Self-Generated Magnetic and Electric Fields at a Mach-6 Shock Front in a Low Density Helium Gas by Dual-Angle Proton Radiography

Journal Article · 21 November 2019 · Physical Review Letters

DOI: https://doi.org/10.1103/PhysRevLett.123.215001 · OSTI ID:1597235

Hua, R. ^[1]; Kim, J. ^[1]; Sherlock, M. ^[2]; Bailly-Grandvaux, M. ^[1]; Beg, F. N. ^[1]; McGuffey, C. ^[1]; Wilks, S. ^[2]; Wen, H. ^[3]; Joglekar, A. ^[3]; Mori, W. ^[3]; Ping, Y. ^[2]

Univ. of California, San Diego, La Jolla, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of California, Los Angeles, CA (United States)

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. Furthermore, 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).

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344; SC0014600

OSTI ID:: 1597235

Report Number(s):: LLNL-JRNL--773469; 965755

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 21 Vol. 123; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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