Study of laser produced plasma in a longitudinal magnetic field

Иванов, В. В.; Maximov, A. V.; Betti, R.; Leal, Luis; Mancini, Roberto; Swanson, K. J.; Golovkin, I.; Fontes, C. J.; Sawada, Hiroshi; Sefkow, A. B.; Wong, Nicholas L.

doi:10.1063/1.5091702

Cited by 12 publications

(3 citation statements)

References 29 publications

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“…from that of a poloidal, or axial magnetic field. In that case, the plasma is collimated in all two-dimensions, thus forming a compact and dense “needle”-shaped column along the Z-axis 8 , 36 , 37 .…”

Section: Introductionmentioning

confidence: 99%

Enhanced X-ray emission arising from laser-plasma confinement by a strong transverse magnetic field

Filippov

Makarov

Burdonov

et al. 2021

Sci Rep

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We analyze, using experiments and 3D MHD numerical simulations, the dynamic and radiative properties of a plasma ablated by a laser (1 ns, 10$$^{12}$$ 12 –10$$^{13}$$ 13 W/cm$$^2$$ 2 ) from a solid target as it expands into a homogeneous, strong magnetic field (up to 30 T) that is transverse to its main expansion axis. We find that as early as 2 ns after the start of the expansion, the plasma becomes constrained by the magnetic field. As the magnetic field strength is increased, more plasma is confined close to the target and is heated by magnetic compression. We also observe that after $$\sim 8$$ ∼ 8 ns, the plasma is being overall shaped in a slab, with the plasma being compressed perpendicularly to the magnetic field, and being extended along the magnetic field direction. This dense slab rapidly expands into vacuum; however, it contains only $$\sim 2\%$$ ∼ 2 % of the total plasma. As a result of the higher density and increased heating of the plasma confined against the laser-irradiated solid target, there is a net enhancement of the total X-ray emissivity induced by the magnetization.

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Section: Introductionmentioning

confidence: 99%

Enhanced X-ray emission arising from laser-plasma confinement by a strong transverse magnetic field

Filippov

Makarov

Burdonov

et al. 2021

Sci Rep

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“…Experimental measurements need to verify that the flux is truly frozen to the plasma, to distinguish it from the case of interactions of unmagetized plasmas in the presence of an external magnetic field. It can also be challenging to ensure that the field penetrates uniformly, rather than seeding density, temperature and flux anisotropy during the interaction of the initially separate components [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Interactions of magnetized plasma flows in pulsed-power driven experiments

Suttle

Burdiak

Cheung

et al. 2019

Plasma Phys. Control. Fusion

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A supersonic flow of magnetized plasma is produced by the application of a 1 MA-peak, 500 ns current pulse to a cylindrical arrangement of parallel wires, known as an inverse wire array. The plasma flow is produced by the × acceleration of the ablated wire material, and a magnetic field of several Tesla is embedded at source by the driving current. This setup has been used for a variety of experiments investigating the interactions of magnetized plasma flows. In experiments designed to investigate magnetic reconnection, the collision of counter-streaming flows, carrying oppositely directed magnetic fields, leads to the formation of a reconnection layer in which we observe ions reaching temperatures much greater than predicted by classical heating mechanisms. The breakup of this layer under the plasmoid instability is dependent on the properties of the inflowing plasma, which can be controlled by the choice of the wire array material. In other experiments, magnetized shocks were formed by placing obstacles in the path of the magnetized plasma flow. The pile-up of magnetic flux in front of a conducting obstacle produces a magnetic precursor acting on upstream electrons at the distance of the ion inertial length. This precursor subsequently develops into a steep density transition via ion-electron fluid decoupling. Obstacles which possess a strong private magnetic field affect the upstream flow over a much greater distance, providing an extended bow shock structure.In the region surrounding the obstacle the magnetic pressure holds off the flow, forming a void of plasma material, analogous to the magnetopause around planetary bodies with self-generated magnetic fields.

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“…This sheath-field-reversal induced focusing may also help explain astrophysical jet formation in an axial magnetic field. Jet formation has previously been studied in sub-100 T level magnetic fields, where several mechanisms have been proposed to explain ion collimation, including shocks 5 , gradients in magnetic pressure 37 , and pinching 38 . While these studies employed magnetohydrodynamic modeling due to the relatively large spatial ( mm) and time ( ns) scales involved, in our study the high magnetic field and short laser pulse duration create spatial ( ) and time ( ps) scales conducive to 3D kinetic modeling.…”

Section: Resultsmentioning

confidence: 99%

Generation of focusing ion beams by magnetized electron sheath acceleration

Weichman

Santos

Fujioka

et al. 2020

Sci Rep

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We present the first 3D fully kinetic simulations of laser driven sheath-based ion acceleration with a kilotesla-level applied magnetic field. The application of a strong magnetic field significantly and beneficially alters sheath based ion acceleration and creates two distinct stages in the acceleration process associated with the time-evolving magnetization of the hot electron sheath. The first stage delivers dramatically enhanced acceleration, and the second reverses the typical outward-directed topology of the sheath electric field into a focusing configuration. The net result is a focusing, magnetic field-directed ion source of multiple species with strongly enhanced energy and number. The predicted improvements in ion source characteristics are desirable for applications and suggest a route to experimentally confirm magnetization-related effects in the high energy density regime. We additionally perform a comparison between 2D and 3D simulation geometry, on which basis we predict the feasibility of observing magnetic field effects under experimentally relevant conditions.

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Study of laser produced plasma in a longitudinal magnetic field

Cited by 12 publications

References 29 publications

Enhanced X-ray emission arising from laser-plasma confinement by a strong transverse magnetic field

Enhanced X-ray emission arising from laser-plasma confinement by a strong transverse magnetic field

Interactions of magnetized plasma flows in pulsed-power driven experiments

Generation of focusing ion beams by magnetized electron sheath acceleration

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