title: Topology of megagauss magnetic fields and of heat-carrying electrons produced in a high-power laser-solid interaction.
abstract: The intricate spatial and energy distribution of magnetic fields, self-generated during high power laser irradiation (at Iλ^{2}∼10^{13}-10^{14}  W.cm^{-2}.μm^{2}) of a solid target, and of the heat-carrying electron currents, is studied in inertial confinement fusion (ICF) relevant conditions. This is done by comparing proton radiography measurements of the fields to an improved magnetohydrodynamic description that fully takes into account the nonlocality of the heat transport. We show that, in these conditions, magnetic fields are rapidly advected radially along the target surface and compressed over long time scales into the dense parts of the target. As a consequence, the electrons are weakly magnetized in most parts of the plasma flow, and we observe a reemergence of nonlocality which is a crucial effect for a correct description of the energetics of ICF experiments.
authors.affiliation: Dipartimento SBAI, Università di Roma La Sapienza, Via Antonio. Scarpa 14, 00161 Rome, Italy and LULI, École Polytechnique, CNRS, CEA, UPMC, 91128 Palaiseau, France.
authors.forename: L
authors.initials: L
authors.lastname: Lancia
authors.affiliation: LULI, École Polytechnique, CNRS, CEA, UPMC, 91128 Palaiseau, France and INRS-EMT, Varennes, Québec J3X 1S2, Canada.
authors.forename: B
authors.initials: B
authors.lastname: Albertazzi
authors.affiliation: CEA, DAM, DIF, F-91297 Arpajon, France.
authors.forename: C
authors.initials: C
authors.lastname: Boniface
authors.affiliation: CEA, DAM, DIF, F-91297 Arpajon, France.
authors.forename: A
authors.initials: A
authors.lastname: Grisollet
authors.affiliation: LULI, École Polytechnique, CNRS, CEA, UPMC, 91128 Palaiseau, France and CEA, DAM, DIF, F-91297 Arpajon, France.
authors.forename: R
authors.initials: R
authors.lastname: Riquier
authors.affiliation: CEA, DAM, DIF, F-91297 Arpajon, France.
authors.forename: F
authors.initials: F
authors.lastname: Chaland
authors.affiliation: CEA, DAM, DIF, F-91297 Arpajon, France.
authors.forename: K-C
authors.initials: KC
authors.lastname: Le Thanh
authors.affiliation: CEA, DAM, DIF, F-91297 Arpajon, France.
authors.forename: Ph
authors.initials: P
authors.lastname: Mellor
authors.affiliation: Dipartimento SBAI, Università di Roma La Sapienza, Via Antonio. Scarpa 14, 00161 Rome, Italy.
authors.forename: P
authors.initials: P
authors.lastname: Antici
authors.affiliation: LULI, École Polytechnique, CNRS, CEA, UPMC, 91128 Palaiseau, France.
authors.forename: S
authors.initials: S
authors.lastname: Buffechoux
authors.affiliation: LULI, École Polytechnique, CNRS, CEA, UPMC, 91128 Palaiseau, France.
authors.forename: S N
authors.initials: SN
authors.lastname: Chen
authors.affiliation: School of Mathematics and Physics, The Queen's University of Belfast, Belfast BT7 1NN, United Kingdom.
authors.forename: D
authors.initials: D
authors.lastname: Doria
authors.affiliation: LULI, École Polytechnique, CNRS, CEA, UPMC, 91128 Palaiseau, France.
authors.forename: M
authors.initials: M
authors.lastname: Nakatsutsumi
authors.affiliation: Heinrich Heine Universität Düsseldorf, D-40225 Düsseldorf, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Peth
authors.affiliation: Heinrich Heine Universität Düsseldorf, D-40225 Düsseldorf, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Swantusch
authors.affiliation: Institute of Applied Physics, 46 Ulyanov Street, 603950 Nizhny Novgorod, Russia.
authors.forename: M
authors.initials: M
authors.lastname: Stardubtsev
authors.affiliation: Dipartimento SBAI, Università di Roma La Sapienza, Via Antonio. Scarpa 14, 00161 Rome, Italy.
authors.forename: L
authors.initials: L
authors.lastname: Palumbo
authors.affiliation: School of Mathematics and Physics, The Queen's University of Belfast, Belfast BT7 1NN, United Kingdom.
authors.forename: M
authors.initials: M
authors.lastname: Borghesi
authors.affiliation: Heinrich Heine Universität Düsseldorf, D-40225 Düsseldorf, Germany.
authors.forename: O
authors.initials: O
authors.lastname: Willi
authors.affiliation: INRS-EMT, Varennes, Québec J3X 1S2, Canada.
authors.forename: H
authors.initials: H
authors.lastname: Pépin
authors.affiliation: LULI, École Polytechnique, CNRS, CEA, UPMC, 91128 Palaiseau, France and Institute of Applied Physics, 46 Ulyanov Street, 603950 Nizhny Novgorod, Russia.
authors.forename: J
authors.initials: J
authors.lastname: Fuchs