Numerical modeling of accelerated pre-compressed CTs in RACE

Summary form only given, as follows. Numerical modeling of accelerated compact toroids in RACE (Ring Accelerator Experiment) has motivated the development and application of a wide range of computational tools. These tools have included the zero-dimensional RAC code for fast parameter and design studies and the two-dimensional, Eulerian, axisymmetric, magnetohydrodynamic (MHD) code HAM used to model plasma ring formation in magnetized plasma guns and acceleration in straight cylindrical electrodes. Extension of the RACE geometry to include converging conical electrodes motivated the development of a new two-dimensional, Lagrangian, axisymmetric, MHD code, TRAC. The code includes optional initialization of the ring magnetic fields to a Taylor-equilibrium profile as well as self-consistent external capacitor bank driving circuit. The stability of initial field configurations with a toroidal mode number >0 can also be determined. The new code is particularly suited for predicting the behavior of accelerated plasma rings in arbitrarily shaped conical electrodes, since the restriction to a rectilinear mesh is removed. In particular, the code was applied to the new precompression geometry in the RACE experiment