Numerical Modeling of Magnetic Flux Compression by a Cylindrical Imploding211 Ionizing Shock Wave

摘要

Generation of electromagnetic radiation (HPM, NNEMP) with extremely high power211u001efrom compact sources driven by high explosives (HE) is of interest in defense 211u001eapplications. A computer code has been developed that models shock wave driven 211u001ecompression of magnetic flux. The authors outline a 1-D cylindrial MHD code that 211u001eallows them to perform computer simulations of cylindrical MFC by SW in a media 211u001ewith variable conductivity. The code accounts for real features of the 211u001econductivity growth. Conservative finite difference schemes are used to 211u001eapproximate the governing equations. An effective rezoning procedure is used, 211u001ewhich allows the authors to perform calculations up to 1000-fold radial 211u001ecompression. The code was benchmarked using a solution of MHD equations that 211u001ecorresponds to a self-similar motion with uniform deformation. By choosing 211u001edifferent models for the conductivity growth, the authors demonstrate that the 211u001etime history of the magnetic field ahead of the shock front (SF) and the 211u001edistribution of the magnetic field in the conducting matter as well is 211u001eessentially dependent on the possible ways of conductivity growth.