Science Alert:  A team of research physicists at Princeton University may have found a new way to control fusion reactions inside doughnut-shaped tokamak reactors — an incremental step towards making fusion energy, the ‘holy grail of energy production’, a reality.
 Many fusion reactors today use light elements in the form of plasma as fuel. The problem is that this elemental plasma is extremely hot — practically as hot as the Sun — and extremely unpredictable and difficult to control.
But there may be a way to force the plasma into doing what we want more predictably and efficiently, as detailed in a new theoretical paper published in the journal Physics of Plasmas.
The Princeton team found that shooting radio frequency waves that super-heat fusion reactions inside a tokamak reactor could potentially reduce the chance of “magnetic islands” — bubble-like structures that can throw fusion reactions out of whack by triggering sudden releases of energy.
“We want the islands not to grow,” explained Eduardo Rodriguez, a graduate student in the Princeton Program in Plasma Physics and first author of the paper, said in a statement.
“Focusing on this can lead to improved stabilization of fusion reactors.”