Modeling of supersonic jet formation in conical wire array Z-pinches

摘要

Supersonic jet production in conical wire array Z-pinches is modeled using a two-dimensional (2D) resistive magneto-hydrodynamic (MHD) code. In conical wire arrays, the converging plasma ablated from the wires stagnates on axis, forming a standing conical shock which redirects and collimates the flow into a jet. As the jet exits the collimator shock, it is radiatively cooled and accelerated by the steep thermal gradients present. Purely hydrodynamic simulations using conditions relevant to the MAGPIE facility show good agreement with the experiments (Lebedev et al., 2002), indicating that narrow, high Mach number (M similar to 20), radiatively cooled tungsten jets of astrophysical relevance can be obtained. To investigate the effects of lower radiative cooling on jet collimation, we modeled an aluminum conical wire array. When radiative losses are less significant, lower Mach number (M similar to 10), less collimated jets are obtained. MHD simulations relevant to the "Z" facility were carried out to investigate the scaling of jet parameters. The resulting hypersonic (M similar to 40), high density jets should allow the investigation of a wider range of astrophysical jet conditions. [References: 29]