A magnetically driven dual-loading device for planar flyer and cylindrical liner: Design and performance validation

The long-pulse pulsed power facility composed of capacitor banks can serve as a loading method to provide high-speed, high-pressure implosion conditions for solid liners. The implosion process is characterized by high symmetry, repeatability, and ease of diagnostics, enabling the study of physical properties of materials and complex fluid dynamics under extreme conditions. However, previous designs for the load region were optimized primarily for cylindrical convergence structures, which are less adaptable when dealing with non-converging geometries. Moreover, for experiments that require comparing physical differences caused by geometric configurations, it is generally not straightforward to perform the same round of experiments using the same loading method. Therefore, we develop a new structure of load region in FP-2 (facility for Fluid Physics investigations-the second generation) that allows planar and cylindrical dual-loading modes to be carried out simultaneously. By calculating dynamic model combined with full-circuit model and electromagnetic simulation, the structural parameters of flyer plate and cylindrical liner were designed. Based on the loading device combined with laser interferometry diagnostic technology, verification experiments, such as flatness test of large-sized flyer plate, were conducted. The experimental results of planar launch and cylindrical implosion in the same experiment demonstrate the feasibility of simultaneous loading. In addition, the dual-loading method was finally applied to spalling experiment, rebound velocity signals were obtained for two kinds of geometric configurations. Compared with conventional single-mode systems, the new device enhances the efficiency-to-cost ratio of experiments, lays a foundation for further structural optimization to enable configuration comparison studies under identical loading conditions, and provides a dual-loading platform for other physical experiments, such as interfacial instability investigations.