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• W4316506857 abstract "Magnetic reconnection is a ubiquitous astrophysical process that rapidly converts magnetic energy into some combination of plasma flow energy, thermal energy, and non-thermal energetic particles, including energetic electrons. Various reconnection acceleration mechanisms in different low-$beta$ (plasma-to-magnetic pressure ratio) and collisionless environments have been proposed theoretically and studied numerically, including first- and second-order Fermi acceleration, betatron acceleration, parallel electric field acceleration along magnetic fields, and direct acceleration by the reconnection electric field. However, none of them have been heretofore confirmed experimentally, as the direct observation of non-thermal particle acceleration in laboratory experiments has been difficult due to short Debye lengths for textit{in-situ} measurements and short mean free paths for textit{ex-situ} measurements. Here we report the direct measurement of accelerated non-thermal electrons from low-$beta$ magnetically driven reconnection in experiments using a laser-powered capacitor coil platform. We use kiloJoule lasers to drive parallel currents to reconnect MegaGauss-level magnetic fields in a quasi-axisymmetric geometry. The angular dependence of the measured electron energy spectrum and the resulting accelerated energies, supported by particle-in-cell simulations, indicate that the mechanism of direct electric field acceleration by the out-of-plane reconnection electric field is at work. Scaled energies using this mechanism show direct relevance to astrophysical observations. Our results therefore validate one of the proposed acceleration mechanisms by reconnection, and establish a new approach to study reconnection particle acceleration with laboratory experiments in relevant regimes." @default.
• W4316506857 created "2023-01-16" @default.
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• W4316506857 date "2023-01-16" @default.
• W4316506857 modified "2023-10-17" @default.
• W4316506857 title "Non-thermal electron acceleration from magnetically driven reconnection in a laboratory plasma" @default.
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• W4316506857 doi "https://doi.org/10.1038/s41567-022-01839-x" @default.

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