X-ray imaging and electron temperature evolution in laser-driven magnetic reconnection experiments at the National Ignition Facility
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arXiv
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| Format: | Preprint |
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2024
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| author | Valenzuela-Villaseca, V. Molina, J. M. Schaeffer, D. B. Malko, S. Griff-McMahon, J. Lezhnin, K. Rosenberg, M. J. Hu, S. X. Kalantar, D. Trosseille, C. Park, H. -S. Remington, B. A. Fiksel, G. Uzdensky, D. Bhattacharjee, A. Fox, W. |
| author_facet | Valenzuela-Villaseca, V. Molina, J. M. Schaeffer, D. B. Malko, S. Griff-McMahon, J. Lezhnin, K. Rosenberg, M. J. Hu, S. X. Kalantar, D. Trosseille, C. Park, H. -S. Remington, B. A. Fiksel, G. Uzdensky, D. Bhattacharjee, A. Fox, W. |
| contents | 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 $\langle T_e \rangle_Y$ are constructed by taking the ratio of intensity of these images obtained with different filters. The plumes have a characteristic temperature $\langle T_e \rangle_Y = 240 \pm 20$ 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 $\langle T_e \rangle_Y = 280 \pm 50$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_07799 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | X-ray imaging and electron temperature evolution in laser-driven magnetic reconnection experiments at the National Ignition Facility Valenzuela-Villaseca, V. Molina, J. M. Schaeffer, D. B. Malko, S. Griff-McMahon, J. Lezhnin, K. Rosenberg, M. J. Hu, S. X. Kalantar, D. Trosseille, C. Park, H. -S. Remington, B. A. Fiksel, G. Uzdensky, D. Bhattacharjee, A. Fox, W. Plasma Physics High Energy Astrophysical Phenomena Solar and Stellar Astrophysics 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 $\langle T_e \rangle_Y$ are constructed by taking the ratio of intensity of these images obtained with different filters. The plumes have a characteristic temperature $\langle T_e \rangle_Y = 240 \pm 20$ 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 $\langle T_e \rangle_Y = 280 \pm 50$ 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. |
| title | X-ray imaging and electron temperature evolution in laser-driven magnetic reconnection experiments at the National Ignition Facility |
| topic | Plasma Physics High Energy Astrophysical Phenomena Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2404.07799 |