国家点火装置激光驱动磁重联实验中的 X 射线成像和电子温度演变

IF 2 3区 物理与天体物理 Q3 PHYSICS, FLUIDS & PLASMAS Physics of Plasmas Pub Date : 2024-08-09 DOI:10.1063/5.0213598
Vicente Valenzuela-Villaseca, Jacob M. Molina, Derek B. Schaeffer, Sophia Malko, Jesse Griff-McMahon, Kirill Lezhnin, Michael J. Rosenberg, S. X. Hu, Dan Kalantar, Clement Trosseille, Hye-Sook Park, Bruce A. Remington, Gennady Fiksel, Dmitri Uzdensky, Amitava Bhattacharjee, William Fox
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引用次数: 0

摘要

我们介绍了在国家点火装置上进行的高谱比磁重联实验的 X 射线成像结果。两个平行的、自磁化的、拉长的激光驱动羽流是通过平铺 40 道激光束产生的。羽流的碰撞形成了一个磁再连接层。带有微通道板探测器的门控 X 射线取景针孔照相机通过各种滤光片生成多幅图像,显示羽流和磁流层的形成和演变过程。由于诊断仪整合了沿视线方向的等离子体自发射,因此可以通过计算这些用不同滤光片获得的图像的强度比来构建二维电子温度图⟨Te⟩Y。在初始激光照射后的 2 毫微秒,羽流的特征温度⟨Te⟩Y=240 ± 20 eV,并在 4 毫微秒之前出现缓慢冷却。由于羽流的碰撞,再连接层在 3 ns 时形成,温度为 ⟨Te⟩Y=280 ± 50 eV。羽流和流片温度的误差条在 4 ns 处分开,表明较冷的流入流加热了流片。利用半分析模型,我们研究了电流片中的各种加热机制。我们发现,在低密度(ne≲7×1018 cm-3)时,重联能量转换将占主导地位,而在高密度(≳1019 cm-3)时,电子-离子碰撞阻力将占主导地位。
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X-ray imaging and electron temperature evolution in laser-driven magnetic reconnection experiments at the national ignition facility
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 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, two-dimensional electron temperature maps ⟨Te⟩Y are constructed by taking the ratio of intensity of these images obtained with different filters. The plumes have a characteristic temperature ⟨Te⟩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 ⟨Te⟩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 survey various heating mechanisms in the current sheet. We find that reconnection energy conversion would dominate at low density (ne≲7×1018 cm−3) and electron-ion collisional drag at high-density (≳1019 cm−3).
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来源期刊
Physics of Plasmas
Physics of Plasmas 物理-物理:流体与等离子体
CiteScore
4.10
自引率
22.70%
发文量
653
审稿时长
2.5 months
期刊介绍: Physics of Plasmas (PoP), published by AIP Publishing in cooperation with the APS Division of Plasma Physics, is committed to the publication of original research in all areas of experimental and theoretical plasma physics. PoP publishes comprehensive and in-depth review manuscripts covering important areas of study and Special Topics highlighting new and cutting-edge developments in plasma physics. Every year a special issue publishes the invited and review papers from the most recent meeting of the APS Division of Plasma Physics. PoP covers a broad range of important research in this dynamic field, including: -Basic plasma phenomena, waves, instabilities -Nonlinear phenomena, turbulence, transport -Magnetically confined plasmas, heating, confinement -Inertially confined plasmas, high-energy density plasma science, warm dense matter -Ionospheric, solar-system, and astrophysical plasmas -Lasers, particle beams, accelerators, radiation generation -Radiation emission, absorption, and transport -Low-temperature plasmas, plasma applications, plasma sources, sheaths -Dusty plasmas
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