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High-power laser experiment on developing supercritical shock propagating in homogeneously magnetized plasma of ambient gas origin

S. Matsukiyo et al.
Phys. Rev. E 106, 025205 – Published 26 August 2022
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  • INTRODUCTION
  • EXPERIMENTAL SETTINGS AND MEASUREMENT…
  • EXPERIMENTAL RESULTS
  • NUMERICAL SIMULATION AND DISCUSSIONS
  • SUMMARY
  • ACKNOWLEDGMENTS
    • References

    Abstract

    A developing supercritical collisionless shock propagating in a homogeneously magnetized plasma of ambient gas origin having higher uniformity than the previous experiments is formed by using high-power laser experiment. The ambient plasma is not contaminated by the plasma produced in the early time after the laser shot. While the observed developing shock does not have stationary downstream structure, it possesses some characteristics of a magnetized supercritical shock, which are supported by a one-dimensional full particle-in-cell simulation taking the effect of finite time of laser-target interaction into account.

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    • Received 25 September 2020
    • Accepted 24 July 2022

    DOI:https://doi.org/10.1103/PhysRevE.106.025205

    ©2022 American Physical Society

    Physics Subject Headings (PhySH)

    1. Research Areas
    Laboratory studies of space & astrophysical plasmas
    Plasma Physics

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    See Also

    High-power laser experiment forming a supercritical collisionless shock in a magnetized uniform plasma at rest

    R. Yamazaki et al.
    Phys. Rev. E 105, 025203 (2022)

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    Vol. 106, Iss. 2 — August 2022

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    • Figure 1
      Figure 1

      Experimental settings: (a) top view, (b) side view near the target, and (c) the relation among the wave numbers of incident probe light (kI), scattered waves (kS), and plasma waves (k) for CTS measurement.

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    • Figure 2
      Figure 2

      SOP data for the cases of (a), (c) B=0 and (b), (d) B=3.8 T. In (a) and (b) a vertical axis denotes an elapsed time from the laser shot. The color shows self-emission intensity normalized to the far upstream value. The intensity profiles at different times are plotted in (c) and (d). The solid and the dashed lines in (d) roughly trace the positions of the main peak and the plateaulike structure.

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    • Figure 3
      Figure 3

      CTS spectra at t=35(±2.5) ns for (a), (c) B=0 and (b), (d) B=3.8 T. In the panels (a) and (b), the vertical and the horizontal axes indicate the position along the probe light (p axis) and the wavelength shift, Δλ, from λ0, the color denotes the arbitrary intensity of the scattered signal, respectively. The corresponding time integrated to obtain this data is shown as the red square in Figs. 2 and 2. Assuming that a planar structure is propagating along the X′ axis, a position along the p axis is projected onto the X′axis as X′=−pcos14∘/2. The projection of the position is indicated as the red vertical bars in Figs. 2 and 2. In the panels (c) and (d), the cross section along the white line (p=−0.5 mm) in (a) and (b) is plotted. See the text in detail.

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    • Figure 4
      Figure 4

      Early time evolution of ion phase space and the profiles of electron density (thick black line) and magnetic field (red line). The color scale denotes ion charge density, ρN.

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    • Figure 5
      Figure 5

      (a) Spatiotemporal evolution of Ne in the PIC simulation with the strength of the Biermann field carried by the target plasma of 22.8 T. (b) Experimental data of CTS ion feature for B=3.8 T in the precursor at p=1.36 mm and t=35 ns. (c) Simulated electron (solid line) and ion (dashed line) distribution functions at the red sharp in (a). (d) Time evolution of ion phase space and (e) electron density profile. The rough positions of the main peak and the plateau are traced by the solid and the dashed lines, respectively.

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    • Figure 6
      Figure 6

      (a) Spatiotemporal evolution of Ne in the PIC simulation with weaker magnetic field of 0.76 T carried by the target plasma. (b) Ion phase space and (c) electron density profile at t=50 ns.

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