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Magnetized plasma implosion in a snail target driven by a moderate-intensity laser pulse.

ABSTRACT: Optical generation of compact magnetized plasma structures is studied in the moderate intensity domain. A sub-ns laser beam irradiated snail-shaped targets with the intensity of about 1016 W/cm2. With a neat optical diagnostics, a sub-megagauss magnetized plasmoid is traced inside the target. On the observed hydrodynamic time scale, the hot plasma formation achieves a theta-pinch-like density and magnetic field distribution, which implodes into the target interior. This simple and elegant plasma magnetization scheme in the moderate-intensity domain is of particular interest for fundamental astrophysical-related studies and for development of future technologies.

SUBMITTER: Pisarczyk T

PROVIDER: S-EPMC6297252 | biostudies-literature | 2018 Dec

REPOSITORIES: biostudies-literature

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Magnetized plasma implosion in a snail target driven by a moderate-intensity laser pulse.

Pisarczyk T T Gus'kov S Yu SY Zaras-Szydłowska A A Dudzak R R Renner O O Chodukowski T T Dostal J J Rusiniak Z Z Burian T T Borisenko N N Rosinski M M Krupka M M Parys P P Klir D D Cikhardt J J Rezac K K Krasa J J Rhee Y-J YJ Kubes P P Singh S S Borodziuk S S Krus M M Juha L L Jungwirth K K Hrebicek J J Medrik T T Golasowski J J Pfeifer M M Skala J J Pisarczyk P P Korneev Ph P

Scientific reports 20181217 1

Optical generation of compact magnetized plasma structures is studied in the moderate intensity domain. A sub-ns laser beam irradiated snail-shaped targets with the intensity of about 10<sup>16</sup> W/cm<sup>2</sup>. With a neat optical diagnostics, a sub-megagauss magnetized plasmoid is traced inside the target. On the observed hydrodynamic time scale, the hot plasma formation achieves a theta-pinch-like density and magnetic field distribution, which implodes into the target interior. This sim ...[more]

PMID: 30559388

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Project description:Super-intense laser plasma interaction has shown great promise as a platform for next generation particle accelerators and sources for electron, x-rays, ions and neutrons. In particular, when a relativistic intense laser focus interacts with a thin solid density target, ionized electrons are accelerated to near the speed of light (c) within an optical cycle and are pushed in the forward and transverse directions away from focus, carrying a significant portion of the laser energy. These relativistic electrons are effectively collisionless, and their interactions with the ions and surrounding cold electrons are predominantly mediated by collective electromagnetic effects of the resulting currents and charge separation. Thus, a deeper understanding of subsequent high energy ions generated from various mechanisms and their optimization requires knowledge of the relativistic electron dynamics and the fields they produce. In addition to producing MV/m quasi-static fields, accelerating the ions and confining the majority of the electrons near the bulk of the laser target, these relativistic electron currents are subject to plasma instabilities like the Weibel instability as they propagate through the thermal population in the bulk target. In this work, we present high temporal (100 fs) and spatial (1 μm) resolution shadowgraphy video capturing relativistic radial ionization front expansion and the appearance of filamentation radiating from the laser spot within a sub-micron thick liquid sheet target. Filamentation within the region persists for several picoseconds and seeds the eventual recombination and heating dynamics on the nanosecond timescale. A large scale three-dimensional particle-in-cell (PIC) simulation of the interaction revealed the presence of strong magnetic fields characteristic of Weibel Instability, and corroborated the relativistic radial expansion of the ionization front, whose speed was determined to be 0.77c. Both the experimental and simulation results strongly point towards the target field ionization and the outward expanding hot electron current as the cause of the radial expansion.

Dataset Information

Magnetized plasma implosion in a snail target driven by a moderate-intensity laser pulse.

Publications

Magnetized plasma implosion in a snail target driven by a moderate-intensity laser pulse.

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