Numerical Study of Quasi-Spherical Wire-Array Implosions on the QiangGuang-I Facility

The magnetic pressure on a (quasi-)spherical load surface increases with the latitude. To achieve quasi-spherical implosions, load parameters should be adjusted to counterpoise the asymmetry of Lorentz force. The implosion quality can be enhanced by redistributing the mass density of a spherical load or changing its initial shape to a prolate one; the latter is more practical for wire-array fabrication. Dynamics of implosions gained with these two methods are numerically investigated, which suggests that both of them are effective in achieving quasi-spherical implosions, and their final kinetic energy are similar with each other. Recent experiments on the QiangGuang-I facility with quasi-spherical wire arrays have confirmed that the implosion quality is susceptive to the load's initial shape. With a proper displacement modification, some evidence of spherical implosion is observed.