论文标题
通过合并高超声等离子体喷气的球形爆内等离子体衬里的一部分的实验表征
Experimental characterization of a section of a spherically imploding plasma liner formed by merging hypersonic plasma jets
论文作者
论文摘要
我们报告了合并高超音速等离子体喷气机的实验结果，这是形成球形内向等离子体衬里的基本构建块，作为曼格托惯性融合的潜在隔离压缩驱动器。喷气机由安装在六个球形室的轮廓间隙同轴性等离子体枪形成和发射。 First, from experiments with two and three merging jets of four different species (N, Ar, Kr, Xe), we show that (1) density spatial non-uniformities can be large (with electron-density jumps ranging from 2.9 for N to 6.6 for Xe) when shocks form upon jet merging, but smaller (density jumps <2) when shocks do not form; （2）喷气杂质（这些实验中的20％Ti）可以通过增加射流合并的碰撞来提高密度空间非均匀性的水平； （3）衬里马赫数可以保持高（> 10），这是等离子体衬里是有效的压缩驱动器所要求的。其次，通过使用AR进行六次和七个合并喷气机的实验，我们提出了跨喷气机的射流到喷气平衡<2％的结果，包括（1）衬套合并和对称衬里的对称性的证据，以及（2）二十架射流的射流形态的潜在有利变化。对于这两个实验，我们介绍了来自三维流体动力代码的实验和合成数据之间的比较。
We report experimental results on merging of hypersonic plasma jets, which is the fundamental building block for forming spherically imploding plasma liners as a potential standoff compression driver for mangeto-inertial fusion. Jets are formed and launched by contoured-gap coaxial plasma guns mounted at the six spherical chamber. First, from experiments with two and three merging jets of four different species (N, Ar, Kr, Xe), we show that (1) density spatial non-uniformities can be large (with electron-density jumps ranging from 2.9 for N to 6.6 for Xe) when shocks form upon jet merging, but smaller (density jumps <2) when shocks do not form; (2) jet impurities (20% Ti in these experiments) can increase the level of density spatial non-uniformity by increasing the collisionality of jet merging; and (3) the liner Mach number can remain high (>10), as required for plasma liners to be an effective compression driver. Second, from experiments with six and seven merging jets using Ar, we present results with improved jet-to-jet balance of <2% across jets, including (1) evidence of substantially increased balance in the jet merging and symmetry of the liner structure, and (2) potentially favorable changes in the jet-merging morphology with the addition of the seventh jet. For both experiments, we present comparison between experimental and synthetic data from three-dimensional hydrodynamic codes.
