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Title: Instability-driven electromagnetic fields in coronal plasmas

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/1.4801515· OSTI ID:1172366
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  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
  2. Univ. of Rochester, NY (United States). Lab. for Laser Energetics

Filamentary electromagnetic fields previously observed in the coronae of laser-driven spherical targets [F. H. S eguin et al., Phys. Plasma. 19, 012701 (2012)] have been further investigated in laser irradiated plastic foils. Face-on proton-radiography provides an axial view of these filaments and shows coherent cellular structure regardless of initial foil-surface conditions. The observed cellular fields are shown to have an approximately constant scale size of 210 lm throughout the plasma evolution. A discussion of possible field-generation mechanisms is provided and it is demonstrated that the likely source of the cellular field structure is the magnetothermal instability. Using predicted temperature and density profiles, the fastest growing modes of this instability were found to be slowly varying in time and consistent with the observed cellular size.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0002035
OSTI ID:
1172366
Journal Information:
Physics of Plasmas, Vol. 20, Issue 5; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 13 works
Citation information provided by
Web of Science

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Cited By (3)

MPRAD: A Monte Carlo and ray-tracing code for the proton radiography in high-energy-density plasma experiments journal December 2019
Nuclear diagnostics for Inertial Confinement Fusion (ICF) plasmas journal January 2020
Magnetic field generation and diffusion by a laser-produced blast wave propagating in non-homogenous plasma journal April 2015

Figures / Tables (11)


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