Biermann-Battery-Driven Magnetized Collisionless Shock Precursors in Laser-Produced Plasmas
Journal Article
·
· Physical Review Letters
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Univ. of California, Los Angeles, CA (United States)
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Univ. of Rochester, NY (United States)
- Univ. of Bordeaux, CNRS, CEA, Talence (France); Czech Academy of Sciences, Dolní B˘re˘zany (Czech Republic)
This Letter reports the first complete observation of magnetized collisionless shock precursors formed through the compression of Biermann-battery magnetic fields in laser produced plasmas. At OMEGA, lasers produce a supersonic CH plasma flow which is magnetized with Biermann-battery magnetic fields. The plasma flow collides with an unmagnetized hydrogen gas jet plasma to create a magnetized shock precursor. The situation where the flowing plasma carries the magnetic field is similar to the Venusian bow shock. Imaging 2𝜔 Thomson scattering confirms that the interaction is collisionless and shows density and temperature jumps. Proton radiographs have regions of strong deflections and FLASH magnetohydrodynamic (MHD) simulations show the presence of Biermann fields in the Thomson scattering region. Electrons are accelerated to energies of up to 100 keV in a power-law spectrum. Here, OSIRIS particle-in-cell (PIC) simulations, initialized with measured parameters, show the formation of a magnetized shock precursor and corroborate the experimental observables.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- National Energy Research Scientific Computing Center (NERSC); USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- FG02-91ER54109; NA0003868; NA0003938; NA0004129
- OSTI ID:
- 2585355
- Report Number(s):
- LLNL--JRNL-2007200
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 12 Vol. 134; ISSN 1079-7114; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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