X-ray imaging and electron temperature evolution in laser-driven magnetic reconnection experiments at the National Ignition Facility
arxiv(2024)
摘要
We present results from X-ray imaging of high-aspect-ratio magnetic
reconnection experiments driven at the National Ignition Facility. Two
parallel, self-magnetized, elongated laser-driven plumes are produced by tiling
40 laser beams. A magnetic reconnection layer is formed by the collision of the
plumes. A gated X-ray framing pinhole camera with micro-channel plate (MCP)
detector produces multiple images through various filters of the formation and
evolution of both the plumes and current sheet. As the diagnostic integrates
plasma self-emission along the line of sight, 2-dimensional electron
temperature maps ⟨ T_e ⟩_Y are constructed by taking the ratio of
intensity of these images obtained with different filters. The plumes have a
characteristic temperature ⟨ T_e ⟩_Y = 240 ± 20 eV at 2 ns
after the initial laser irradiation and exhibit a slow cooling up to 4 ns. The
reconnection layer forms at 3 ns with a temperature ⟨ T_e ⟩_Y =
280 ± 50 eV as the result of the collision of the plumes. The error bars of
the plumes and current sheet temperatures separate at 4 ns, showing the
heating of the current sheet from colder inflows. Using a semi-analytical
model, we find that the observed heating of the current sheet is consistent
with being produced by electron-ion drag, rather than the conversion of
magnetic to kinetic energy.
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