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Implosion of auto-magnetizing helical liners on the Z facility

机译：自动磁化螺旋衬里对Z设施的影响

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摘要

In the first auto-magnetizing liner implosion experiments on the Z Facility, precompressed internal axial fields near 150 T were measured and 7.2-keV radiography indicated a high level of cylindrical uniformity of the imploding liner's inner surface. An auto-magnetizing (AutoMag) liner is made of discrete metallic helical conductors encapsulated in insulating material. The liner generates internal axial magnetic field as a 1-2 MA, 100-200 ns current prepulse flows through the helical conductors. After the prepulse, the fast-rising main current pulse causes the insulating material between the metallic helices to break down ceasing axial field production. After breakdown, the helical liner, nonuniform in both density and electrical conductivity, implodes in 100 ns. In-flight radiography data demonstrate that while the inner wall maintains cylindrical uniformity, multiple new helically oriented structures are self-generated within the outer liner material layers during the implosion; this was not predicted by simulations. Furthermore, liner stagnation was delayed compared to simulation predictions. An analytical implosion model is compared with experimental data and preshot simulations to explore how changes in the premagnetization field strength and drive current affect the liner implosion trajectory. Both the measurement of > 100 T internal axial field production and the demonstration of cylindrical uniformity of the imploding liner's inner wall are encouraging for promoting the use of AutoMag liners in future MagLIF experiments. Published under license by AIP Publishing.
机译：在Z设施的第一种自动磁化衬垫内爆算实验中，测量了150吨附近的前置的内轴线，7.2-KeV射线照相表明了普通的衬里内表面的高水平圆柱形均匀性。自动磁化（自动磁化）衬里由封装在绝缘材料中的离散金属螺旋导体制成。衬里产生内部轴向磁场为1-2 mA，100-200ns电流预布置流过螺旋导体。在Prepulse之后，快速上升的主电流脉冲导致金属螺旋之间的绝缘材料分解停用轴向野外产生。在击穿后，螺旋衬垫，密度和导电性的非均匀，在100ns中造成。飞行中的放射线摄影数据表明，虽然内壁保持圆柱形均匀性，但在内部内部内部衬里材料层内部的多个新的螺旋定向结构是自成的;这不是通过模拟预测的。此外，与模拟预测相比，延迟衬里停滞。将分析爆炸模型与实验数据进行比较，并使分析模拟探讨了预热场强度和驱动电流的变化如何影响衬里内爆轨道。介绍衬里内壁的圆柱形均匀性的测量均可促进在未来的Maglif实验中促进自动衬垫的使用。通过AIP发布在许可证下发布。

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