Saturation of the compression of two interacting magnetized plasma toroids evidenced in the laboratory

A. Sladkov, C. Fegan, W. Yao, A. F. A. Bott, S. N. Chen, H. Ahmed, E. D. Filippov, R. Lelièvre, P. Martin, A. McIlvenny, T. Waltenspiel, P. Antici, M. Borghesi (), S. Pikuz, A. Ciardi, E. d’Humières, A. Soloviev, M. Starodubtsev and J. Fuchs ()
Additional contact information
A. Sladkov: Light Stream Labs LLC
C. Fegan: Queen’s University Belfast
W. Yao: UPMC Univ Paris 06 : Sorbonne Université, Ecole Polytechnique, Institut Polytechnique de Paris
A. F. A. Bott: University of Oxford
S. N. Chen: “Horia Hulubei” National Institute of Physics and Nuclear Engineering
H. Ahmed: STFC Rutherford Appleton Laboratory
E. D. Filippov: CLPU
R. Lelièvre: UPMC Univ Paris 06 : Sorbonne Université, Ecole Polytechnique, Institut Polytechnique de Paris
P. Martin: Queen’s University Belfast
A. McIlvenny: Queen’s University Belfast
T. Waltenspiel: UPMC Univ Paris 06 : Sorbonne Université, Ecole Polytechnique, Institut Polytechnique de Paris
P. Antici: INRS-EMT
M. Borghesi: Queen’s University Belfast
S. Pikuz: HB11 Energy Holdings
A. Ciardi: LERMA
E. d’Humières: UMR 5107
A. Soloviev: Independent Researcher
M. Starodubtsev: Independent Researcher
J. Fuchs: UPMC Univ Paris 06 : Sorbonne Université, Ecole Polytechnique, Institut Polytechnique de Paris

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Interactions between magnetic fields advected by matter play a fundamental role in the Universe at a diverse range of scales. A crucial role these interactions play is in making turbulent fields highly anisotropic, leading to observed ordered fields. These in turn, are important evolutionary factors for all the systems within and around. Despite scant evidence, due to the difficulty in measuring even near-Earth events, the magnetic field compression factor in these interactions, measured at very varied scales, is limited to a few. However, compressing matter in which a magnetic field is embedded, results in compression up to several thousands. Here we show, using laboratory experiments and matching three-dimensional hybrid simulations, that there is indeed a very effective saturation of the compression when two independent parallel-oriented magnetic fields regions encounter one another due to plasma advection. We found that the observed saturation is linked to a build-up of the magnetic pressure, which decelerates and redirects the inflows at their encounter point, thereby stopping further compression. Moreover, the growth of an electric field, induced by the incoming flows and the magnetic field, acts in redirecting the inflows transversely, further hampering field compression.

Date: 2024
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DOI: 10.1038/s41467-024-53938-3

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