M2P2
**For human travelers the greatest advantage of M2P2 might not be steady acceleration or fuel efficiency, but rather its impressive safety features. Just as the Earth's magnetosphere protects us from solar radiation, an M2P2 bubble could shield spacefarers from cosmic rays and solar flares.
"The magnetic shielding idea needs to be investigated more carefully," noted Gallagher, "but it looks promising. By chaining multiple M2P2 units together on the same spacecraft, we should be able to minimize plasma losses and end up with a better cosmic ray shield as a bonus.**
http://science.nasa.gov/headlines/y2000/ast04oct_1.htm