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Gigagauss-scale quasistatic magnetic field generation in a snail-shaped target

Ph. Korneev, E. d'Humières, and V. Tikhonchuk
Phys. Rev. E 91, 043107 – Published 22 April 2015
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  • INTRODUCTION
  • PARTICLE-IN-CELL SIMULATIONS FOR AN…
  • DISCUSSION
  • CONCLUSIONS AND PERSPECTIVES
  • ACKNOWLEDGMENTS
    • Supplemental Material
    References

    Abstract

    A simple setup for the generation of ultra-intense quasistatic magnetic fields, based on the generation of electron currents with a predefined geometry in a curved snail (or ‘escargot’) target, is proposed and analyzed. Particle-in-cell simulations and qualitative estimates show that gigagauss scale magnetic fields may be obtained with existent laser facilities. The described mechanism of the strong magnetic field generation may be useful in a wide range of applications, from laboratory astrophysics to magnetized inertial confinement fusion schemes.

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    • Received 30 September 2014
    • Revised 25 December 2014

    DOI:https://doi.org/10.1103/PhysRevE.91.043107

    ©2015 American Physical Society

    Authors & Affiliations

    Ph. Korneev*

    • NRNU MEPhI, Moscow 115409, Russian Federation and University of Bordeaux, CNRS, CEA, CELIA, 33405 Talence, France

    E. d'Humières and V. Tikhonchuk

    • University of Bordeaux, CNRS, CEA, CELIA, 33405 Talence, France

    • *korneev@theor.mephi.ru

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    Issue

    Vol. 91, Iss. 4 — April 2015

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    • Figure 1
      Figure 1

      Electron density (A1–D1), and magnetic field Bz (A2–D2) at time moments: 0.62,1.9,3.1,4.3 ps correspondingly for A1,B1,C1,D1 and A2,B2,C2,D2, for the example Gold-type target. Electron density is shown in units of nc=1.3×1021cm−3, and is cut on the value of 6.5×1021cm−3. The magnetic field is shown in units of 1.16×108Gauss, so that maximum value of 2.6 in the color bar corresponds to 3×108Gauss. Axis z is directed to the viewer. In B2, the black dashed arrow along the target inner surface indicates surface guided electrons, the black solid arrow corresponds to the electrons, which produce reverse current, and the long-dashed arrow shows electron motion, which is deflected by the magnetic field, already formed inside the target. For the time evolution see Supplemental Material [9].

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    • Figure 2
      Figure 2

      Current density jy in the selected domain marked with a dashed lines in Fig. 1(A2,B2), in subsequent time moments 0.46,0.62,1.9 ps. Negative, more intense current is responsible for a negative Bz in Fig. 1(A2,B2,C2,D2). In (C) the dot-dashed arrow shows electrons, directly accelerated by the laser pulse, the solid arrow shows electrons, which produce the inverse current.

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    • Figure 3
      Figure 3

      Energy balance during the interaction. After 2 ps, when the laser pulse is gone, the electromagnetic energy is composed only by the magnetic field energy, which has the order of 5–7% of the total laser pulse energy.

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    • Figure 4
      Figure 4

      Examples of target geometries for the experimental applications of the considered effect: (a) Two cone-like ‘escargot’ targets for collisions of magnetized plasmas; (b) magnetic trap geometry; (c) microtocamak geometry. Black arrows show laser pulses directions.

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