美国洛斯阿拉莫斯国家实验室飞马一号和飞马二号电容器组两次内爆辐射实验的二维模拟结果比较与分析

D. L. Peterson, R. L. Bowers, C. Lebeda, W. Matuska, John F. Benage, G. Idzorek, H. Oona, J. Stokes, N. Roderick
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引用次数: 3

摘要

PegI-41和pegi -25分别在美国洛斯阿拉莫斯国家实验室的Pegasus I电容器组和pegi -25上进行,实验包括13 mg(标称)、5 cm半径、2 cm高的薄圆柱形铝箔内爆,产生轴上等离子体热化产生的软x射线辐射脉冲。内爆以直接驱动(无中间开关)方式进行,峰值电流分别约为4 MA和5 MA,内爆次数约为2.5 /spl mu/s和2.0 /spl mu/s。PegII-25的辐射产率约为250 kJ。这些实验的目的是检查内爆的物理性质,并将这种物理性质与辐射脉冲的产生联系起来,并提供可以与二维辐射磁流体动力学(RMHD)模拟进行比较的详细实验数据。实验诊断套件包括法拉第旋转和dB/dt电流测量,可见分幅相机,x射线带状线相机,时间相关光谱,辐射热计和XRD。这些实验结果的比较表明,在不稳定性发展、电流和辐射脉冲数据(包括脉冲宽度、形状、峰值功率和总辐射产率)方面,这些实验结果与二维模拟结果一致。不稳定性支配着内爆的行为,并在很大程度上决定了所产生的辐射脉冲的性质。二维模拟可以看作是理解内爆物理的重要工具。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Comparison and analysis of 2-D simulation results with two implosion radiation experiments on the Los Alamos Pegasus I and Pegasus II capacitor banks
Two experiments, PegI-41, conducted on the Los Alamos Pegasus I capacitor bank, and PegII-25, on the Pegasus II bank, consisted of the implosions of 13 mg (nominal), 5 cm radius, 2 cm high thin cylindrical aluminum foils resulting in soft X-ray radiation pulses from the plasma thermalizion on axis. The implosions were conducted in direct-drive (no intermediate switching) mode with peak currents of about 4 MA and 5 MA respectively, and implosion times of about 2.5 /spl mu/s and 2.0 /spl mu/s. A radiation yield of about 250 kJ was measured for PegII-25. The purpose of these experiments was to examine the physics of the implosion and relate this physics to the production of the radiation pulse and to provide detailed experimental data which could be compared with 2-D radiation-magnetohydrodynamic (RMHD) simulations. Included in the experimental diagnostic suites were Faraday rotation and dB/dt current measurements, a visible framing camera, an X-ray stripline camera, time-dependent spectroscopy, bolometers and XRD's. A comparison of the results from these experiments shows agreement with 2-D simulation results in the instability development, current, and radiation pulse data, including the pulsewidth, shape, peak power and total radiation yield as measured by bolometry. Instabilities dominate the behavior of the implosion and largely determine the properties of the resulting radiation pulse. The 2-D simulations can be seen to be an important tool in understanding the implosion physics.
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