Active shielding (as opposed to passive shielding that uses more mass of materials) is not a new idea . The Rutherford Appleton Group every other year or so contacts NASA saying, look what we can do. Annoyingly, they do the contacting of NASA through the State department occasionally... NASA looks at their design, says "Uh huh, have you done a tech. demo yet?"
RAL says, "Yes, here are the results."
NASA says, "Yes, but this is for 10 MeV electrons. Which are not really part of the space radiation problem. Where are the higher energy proton and heavy ion results?"
RAL says, "..."
Space radiation protection is fundamentally different from terrestrial radiation protection. Space radiation is much higher energy and consists mainly of protons (but also heavy ions are important due to the Z^2 effect of radiation dose). And it is omnipresent - you cannot get away from space radiation - it is everywhere.
See, the problem with the unconfined magnetic field work is that the size and mass of the equipment to make a magnetic dipole against cosmic rays is prohibitive. The most recent analysis that I know of is by Paluzek  and needs a million kg in equipment with a diameter of 100 meters...
A nice review of the science and engineering aspects of active shielding can be found in Townsend (2005) .
 Townsend, L.W., "Critical analysis of active shielding methods for space radiation protection," Aerospace Conference, 2005 IEEE , vol., no., pp.724,730, 5-12 March 2005, doi: 10.1109/AERO.2005.1559364
 M. A. Paluszek, “Magnetic Radiation Shielding forPermanent Space Habitats,” in The Industrialization of Space: Proceedings of the Twenty-third Annual Meeting, American Astronautical Society,36 Part 1, 545-574, 1978.