Radiation-Induced Coupling to a Truncated Cylinder within a Cylinder

Results from an investigation involving the experimentally measured and calculated electromagnetic response of two mathematically tractable geometries exposed to 12 MEV thick-target bremsstrahlung are presented. One geometry involving parallel plates, which can be adequately described by a one-dimensional model, was used to study the interaction of a partially ionized gas with a negatively charged conducting surface. The results indicate the existence of a boundary region, consisting of an electron depletion layer, that can effect the electrical response of systems in an ionized gas environment. A more complicated geometry involving concentric cylinders was used to check the adequacy of our calculational procedure which utilized a finite differencing solution of Maxwell´s equations. The experimental results indicate that the electrical response of the more complicated geometry can be approximately described by our calculational procedure; but, the requirement for refinements (such as the inclusion of the boundary layer effects and adequate Monte Carlo transport source descriptions) may be warranted.