Spectroscopic Measurements of the Formation of a Conical Section of Spherically Imploding Plasma Liners*

S. Langendorf, S. Hsu, J. Dunn, K. Yates, M. Gilmore, J. Cassibry, K. Schillo, R. Samulyak, W. Shih
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Abstract

The Plasma Liner Experiment-ALPHA (PLX-α) is investigating the merging of supersonic plasma jets into a spherically imploding plasma liner as a driver for use in magneto-inertial fusion (MIF) architectures. 1 The present work is focused on characterizing the merging of six and/or seven plasma jets, converging in a cone of solid angle $0.4 \pi $ over a distance of 1.3 meters. Results from high-speed imaging, photodiode arrays, self-emission visible survey spectroscopy, and self-emission visible high-resolution spectroscopy will be presented, yielding measurements of plasma velocity, number density, electron/ ion temperatures, and mean ionization state pre- and post-merge. Anticipated plasma parameter regimes are $\mathrm {n}\sim 10 ^{15}-10 ^{17}$ cm$^{-3}$, $\mathrm {T}\sim 1-10$ eV, and $\mathrm {v}\sim 50$ km/s, with gas species varied among argon, nitrogen, neon, krypton, and xenon. Images and spectra will be compared with synthetic data generated from 3D fronttracking and smooth-particle-hydrodynamic simulations coupled with atomic physics / opacity analysis codes. Results will inform questions of liner-Mach-number and lineruniformity evolution throughout the jet-merging and subsequent liner-convergence process.
球体内爆等离子体衬里锥形截面形成的光谱测量*
等离子体衬垫实验- alpha (PLX-α)正在研究超音速等离子体射流合并到球体内爆等离子体衬垫中,作为磁惯性聚变(MIF)体系结构的驱动器。目前的工作重点是描述六个和/或七个等离子体射流的合并,在1.3米的距离上以立体角$0.4 \pi $的锥形聚集。将展示高速成像、光电二极管阵列、自发射可见光巡天光谱和自发射可见光高分辨率光谱的结果,产生等离子体速度、数量密度、电子/离子温度和合并前后的平均电离状态的测量结果。预期的等离子体参数范围为$\mathrm {n}\sim 10 ^{15}-10 ^{17}$ cm $^{-3}$、$\mathrm {T}\sim 1-10$ eV和$\mathrm {v}\sim 50$ km/s,气体种类包括氩、氮、氖、氪和氙。图像和光谱将与3D前沿跟踪和光滑粒子流体动力学模拟以及原子物理/不透明度分析代码生成的合成数据进行比较。结果将为整个射流合并和随后的线性收敛过程中的线性马赫数和线性均匀性演变提供信息。
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