Two‐dimensional direct simulation of deuterium‐fiber‐initiated Z pinches with detailed comparison to experiment

摘要: Deuterium‐fiber‐initiated Z‐pinch experiments have been simulated using a two‐dimensional resistive magnetohydrodynamic model, which includes many important experimental details, such as ‘‘cold‐start’’ initial conditions, thermal conduction, radiation, actual discharge current versus time, and grids of sufficient size resolution to allow realistic development the plasma. When fiber becomes fully ionized (at time depending on ramp thickness), simulations show rapidly developing m=0 instabilities, originated in corona surrounding fiber, drive intense nonuniform heating rapid expansion plasma column. Diagnostics generated from simulation results, shadowgrams interferograms, are good agreement with experiment.