title: Precision mapping of laser-driven magnetic fields and their evolution in high-energy-density plasmas.
abstract: The magnetic fields generated at the surface of a laser-irradiated planar solid target are mapped using ultrafast proton radiography. Thick (50  μm) plastic foils are irradiated with 4-kJ, 2.5-ns laser pulses focused to an intensity of 4×10^{14}  W/cm^{2}. The data show magnetic fields concentrated at the edge of the laser-focal region, well within the expanding coronal plasma. The magnetic-field spatial distribution is tracked and shows good agreement with 2D resistive magnetohydrodynamic simulations using the code draco when the Biermann battery source, fluid and Nernst advection, resistive magnetic diffusion, and Righi-Leduc heat flow are included.
authors.affiliation: Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA.|Department of Mechanical Engineering, University of Rochester, Rochester, New York 14623, USA.
authors.forename: L
authors.initials: L
authors.lastname: Gao
authors.affiliation: Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA.|Fusion Science Center for Extreme States of Matter, University of Rochester, Rochester, New York 14623, USA.
authors.forename: P M
authors.initials: PM
authors.lastname: Nilson
authors.affiliation: Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA.
authors.forename: I V
authors.initials: IV
authors.lastname: Igumenshchev
authors.affiliation: Department of Physics, Imperial College, London SW7 2AZ, United Kingdom.
authors.forename: M G
authors.initials: MG
authors.lastname: Haines
authors.affiliation: Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA.|Department of Physics and Astronomy, University of Rochester, Rochester, New York 14623, USA.
authors.forename: D H
authors.initials: DH
authors.lastname: Froula
authors.affiliation: Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA.|Department of Mechanical Engineering, University of Rochester, Rochester, New York 14623, USA.|Fusion Science Center for Extreme States of Matter, University of Rochester, Rochester, New York 14623, USA.|Department of Physics and Astronomy, University of Rochester, Rochester, New York 14623, USA.
authors.forename: R
authors.initials: R
authors.lastname: Betti
authors.affiliation: Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623, USA.|Department of Mechanical Engineering, University of Rochester, Rochester, New York 14623, USA.|Fusion Science Center for Extreme States of Matter, University of Rochester, Rochester, New York 14623, USA.|Department of Physics and Astronomy, University of Rochester, Rochester, New York 14623, USA.
authors.forename: D D
authors.initials: DD
authors.lastname: Meyerhofer