"Last week's test was a success. We were able to completely fill the vacuum chamber with a magnetic bubble. The only thing that stopped the expansion was the presence of the chamber walls. In space this same experiment might create a mini-magnetosphere 15 km across.

Maintaining such a bubble in space would require about 1 kW of power and less than 1 kg per day of helium propellant for the plasma source. In return, the bubble would intercept about 600 kW of solar wind power."