Numerical modeling of the temperature gradients and spectra of the plasma armature on Thunderbolt
Abstract
Numerical simulations of the spectra recorded on Thunderbolt shots 26 and 27 are presented. The calculations proceed via multifrequency radiation transport and are based on the assumptions that the plasma armature is cylindrically symmetric, the atomic constituents are homogeneously mixed and in pressure equilibrium, and the temperature gradient is specified. For the case of shot 27, the simulation is in excellent agreement with experiment and leads to a specific inference of a temperature gradient. For the case of shot 26, (where one capacitor bank fired early) the simulations indicate that the plasma armature for this shot did not satisfy some or all of the assumptions above. Since the aluminum absorption feature on shot 26 is too narrow relative to the B 2 and Cu 1 features there probably was a 'blob' of aluminum near the wall.
 Publication:

Naval Research Lab. Report
 Pub Date:
 June 1993
 Bibcode:
 1993nrl..reptR....K
 Keywords:

 Armatures;
 Mathematical Models;
 Plasma Acceleration;
 Plasma Diagnostics;
 Plasmas (Physics);
 Railgun Accelerators;
 Temperature Gradients;
 Aluminum;
 Capacitors;
 Computerized Simulation;
 Radiation Transport;
 Launch Vehicles and Space Vehicles