Pekka Janhunen of the Finnish Meteorological Institute first proposed the concept of electric sails in 2006, which utilize the solar wind dynamic pressure to generate a small, yet continuous thrust by interacting with an electric field generated from charged tethers. This technology could be a competitive propulsion system for future missions, and NASA’s Marshall Space Center has provided funding for a Small Business Technology Transfer Phase II project to model the thruster performance of an E-sail spacecraft. This work will include a test campaign to validate parallel 3D Particle-In-Cell (PIC) codes with improved boundary conditions. This dissertation entails the experimental test campaign needed to validate the parallel 3D Particle-In- Cell (PIC) codes with improved boundary conditions.