Apply E Field to electron particle motion simulations

[MatthewGrim]

This issue documents the addition of an electric field to the simulations of electron particle motion being run. This should shorten confinement times.

[MatthewGrim]

Preliminary results

n = 0.0

n = 1e4

n = 1e8

n = 1e12

Notes

It's a very preliminary result, but the sims show little chance of confining the 1e12 plasma level we need to create a deep enough well depth. These sims need to be run with a faster c++ code than what I currently have if I'm going to get a good scan out.

[MatthewGrim]

This issue is closed and will be picked up properly when I have a faster code.