Physicists led by Gerrit Kramer at the U.
S. Department of Energy's (DOE) Princeton Plasma Physics Laboratory (PPPL) own conducted simulations that propose that applying magnetic fields to fusion plasmas can control instabilities known as Alfvén waves that can reduce the efficiency of fusion reactions. Such instabilities can cause quickly moving charged particles called "fast ions" to escape from the core of the plasma, which is corralled within machines known as tokamaks.
Source: phys.org