Accession Number : ADA131275

Title :   Alternate Implosion Models for the Plane Parallel Diode.

Descriptive Note : Final rept. 1 Nov 80-1 Nov 81,


Personal Author(s) : Terry,Robert E

PDF Url : ADA131275

Report Date : 02 Apr 1982

Pagination or Media Count : 90

Abstract : The evolution of imploding Z-pinch plasmas in a place parallel diode is modeled in two ways through the computer code ZDIPR, described here. The first consists in a complete electromagnetic field solution via the appropriate Hertz vector potential, combined with a radiation coupled hydrodynamic solution of the Braginskii fluid equations. The second, in an approximate electrodiffusive solution for the axial electric field, combined with the radiation coupled hydrodynamic model. The hydrodynamic solution is effected by an implicit advance of ion temperature, electron temperature plus chemical potential, and (in the electrodiffusive limit) the axial electric field. This is subcycled under the control of either a predictor/corrector or fully implicit advance of the radial fluid velocity and Lagrangian position coordinate. Radiation transport is calculated by probability of escape algorithms operating on a preselected set of frequency domains. The elcetromagnetic field advance is effected through wave equation quadrature (for Z and derivative sub tZ) followed by a numerical differentiation of this potential (smoothly interpolated to the fluid mesh) which provides E sub Z and B sub theta.

Descriptors :   *Mathematical models, *Plasmas(Physics), *Implosions, *Computer programs, Diodes, Electromagnetic fields, Hydrodynamic codes, Lagrangian functions, Electric fields, Radiative transfer, Wave equations

Subject Categories : Numerical Mathematics
      Computer Programming and Software
      Plasma Physics and Magnetohydrodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE