Talk-Polywell.org

... What we discovered is that if you put a magnetic field around an object in a flowing plasma, the electrons, which are very light, will follow the new magnetic field that you've put there but the ions, the very fast ions, will overshoot -- they won't follow the magnetic field lines.

"You end up with a constant electric field that can be enough that it actually refracts or deflects enough of the radiation from inside the magnetic cavity that you've formed to protect the astronauts ...