Date of Award

12-2011

Degree Type

Thesis

Degree Name

Master of Science

Major

Aerospace Engineering

Major Professor

Gary A. Flandro

Committee Members

Trevor M. Moeller, Christian G. Parigger

Abstract

A basic hybrid radiation shield concept, consisting of both a monopole positive electrostatic potential barrier and a current-carrying superconducting solenoid, was predicted to provide a more effective method of shielding a habitable torus region than a solenoid acting alone. A randomized position and velocity vector simulation of equal-energy iron ions using a Lagrangian reference frame was performed on the exact magnetic field integral for the solenoid and a discrete summation electrostatic field for a toroidal monopole array approximating a potential surface. Each particle is injected at a specific energy (100, 150 MeV and 1 GeV). Two cases were evaluated at each particle energy modeling 2x104 particles. The first case studied effects from only the magnetic dipole field (1.1x1013 A m2); the second case evaluated phenomena from a combined magnetic dipole field and electrostatic potential (20 MV). The toroidal electrostatic potential’s influence on the size and shape of the Störmer magnetic dipole exclusion region was examined as the main evaluating criterion against the pure magnetic field results. It was shown that the electrostatic potential influences the size of the Störmer dipole exclusion region, and the ratio of particle energy to electrostatic potential is significant in determining the amount increased. It was found that a low particle energy to electrostatic potential ratio of 5:1 increases Störmer area approximately by a factor of 2.

Files over 3MB may be slow to open. For best results, right-click and select "save as..."

Share

COinS