What’s New

Physicists usually rely on electromagnetic fields to harness the power of plasma, the fourth state of matter, in fusion power experiments. But University of Missouri researchers have managed to create rings of plasma that can hold their shape without the use of outside electromagnetic fields—possibly paving the way for a new age of practical fusion power and leading to the creation of new energy storage devices.

 

Traditional efforts to achieve nuclear fusion have relied upon multi-billion-dollar fusion reactors, called tokamaks, which harness powerful electromagnetic fields to contain the super-heated plasmas resulting from the fusion reactions. The ability to create plasma with self-confining electromagnetic fields in the open air could eliminate the need for external electromagnetic fields in future fusion experiments, and with it, much of the expense.

 

The researchers created plasma rings about 15 centimeters in diameter that flew through the air across distances up to 60 centimeters. The rings lasted just 10 milliseconds, but reached temperatures greater than the sun's fiery fusion core at around 6600 to 7700 degrees K (6327 to 7427 degrees C). Plasma physicists suspect that magnetic fields are still involved—but that the plasma rings create their own.