Abstract
Magnetic reconnection converts magnetic energy into thermal and kinetic energy in plasma. Among the numerous candidate mechanisms, ion acoustic instabilities driven by the relative drift between ions and electrons (or equivalently, electric current) have been suggested to play a critical role in dissipating magnetic energy in collisionless plasmas. However, their existence and effectiveness during reconnection have not been well understood due to ion Landau damping and difficulties in resolving the Debye length scale in the laboratory. Here we report a sudden onset of ion acoustic bursts measured by collective Thomson scattering in the exhaust of anti-parallel magnetically driven reconnection using high-power lasers. The ion acoustic bursts are followed by electron acoustic bursts with electron heating and bulk acceleration. We reproduce these observations with one- and two-dimensional particle-in-cell simulations in which an electron outflow jet drives ion acoustic instabilities, forming double layers. These layers induce electron two-stream instabilities that generate electron acoustic bursts and energize electrons. Our results demonstrate the importance of ion and electron acoustic dynamics during reconnection when ion Landau damping is ineffective, a condition applicable to a range of astrophysical plasmas including near-Earth space, stellar flares and black hole accretion engines.
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Data availability
The experimental Thomson scattering spectrograms are available on request from the corresponding authors.
Code availability
The synthetic Thomson scattering calculation code is available on request from the corresponding authors. The 1D electrostatic PIC simulation code is available in ref. 62. The OSIRIS 4.0 PIC simulation code is available to authorized users by signing memoranda of understanding with the OSIRIS Consortium, consisting of IST and UCLA. FLASH rad-MHD code is available at https://flash.rochester.edu. The calculation code for the plasma dispersion relation is available in the PlasmaDispersionRelation repository via GitHub at https://github.com/xiaoshulittletree.
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Acknowledgements
This research is supported by the US Department of Energy (DoE), Office of Science, Office of Fusion Energy Sciences High-Energy-Density Laboratory Plasma Science program, under award no. DE-SC0020103 (H.J., S.Z., A.C., L.G. and E.G.B.). The experiment was conducted at the OMEGA Laser Facility at the University of Rochester’s Laboratory for Laser Energetics with the beam time through the National Laser Users’ Facility (NLUF) Program supported by DoE/National Nuclear Security Administration (NNSA). E.G.B. acknowledges support from DoE grants DE-SC0020432 and DE-SC0020434, and NSF grants AST-1813298 and PHY-2020249. J.K., C.L., A.B. and R.P. are supported under the auspices of the US DoE/NNSA (contract DE-NA0003868). The FLASH code used in this work was in part developed by the DoE NNSA-ASC OASCR Flash Center at the University of Chicago. We would like to acknowledge the OSIRIS Consortium, consisting of UCLA and IST (Lisbon, Portugal), for providing access to the OSIRIS 4.0 framework supported by NSF ACI-1339893. We would like to thank Q. Wang, L. Suttle, J. Halliday, S. Lebedev and W. Daughton for fruitful discussions.
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H.J., L.G. and E.G.B. initiated the research. S.Z., A.C., L.G., H.J. and E.G.B. designed the experiment with inputs from J.M., H.C., R.F., D.H.F. and J.K. S.Z., R.F., D.H.F. and J.K. analysed the Thomson scattering spectra. S.Z., A.C., L.G., H.J., J.K., C.L., A.B. and H.C. performed the experiments. C.L., A.B. and R.P. conducted and analysed the proton radiography. H.J. and E.G.B. contributed to the astrophysics implications. S.Z. performed the 1D and 2D PIC simulations, FLASH simulations, synthetic Thomson scattering simulations and synthetic proton radiography simulations. S.Z., A.C., L.G., H.J. and E.G.B. contributed to the simulation data interpretations. S.Z., H.J., E.G.B. and L.G. wrote the manuscript. All the authors read, revised and approved the final version of the manuscript.
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Zhang, S., Chien, A., Gao, L. et al. Ion and electron acoustic bursts during anti-parallel magnetic reconnection driven by lasers. Nat. Phys. 19, 909–916 (2023). https://doi.org/10.1038/s41567-023-01972-1
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DOI: https://doi.org/10.1038/s41567-023-01972-1
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