The document linked at the end of the talk currently contains summary regarding the radiation problem on the way to Mars. I've heard of the following approach.

The document linked at the end of the talk currently contains summary regarding the radiation problem on the way to Mars. I've heard of the following approach. The spacecraft generates a magnetic field which spreads around it in flight, having some substantial size (order of kilometers). Relatively small amounts of matter (some gas) are constantly emitted from spacecraft, get ionized and trapped in the magnetic field. Such a low density thick "cushion" of ions makes the radiation shielding. I'd like to learn more about effectiveness of such an approach.