Chinese Tokamak Keeps Plasma 2.6 Times Hot As Sun

Good news for fusion energy progress and a new world record for the Chinese Academy of Sciences, as its Experimental Advanced Superconducting Tokamak (EAST), or "artifical sun," maintains 70 million degrees Celsius (126 million °F) for 1,056 seconds, Loz Blain reported for New Atlas.

Photo Insert: Interior of the building that will house the world's largest tokamak reactor

High-temperature plasma is a critical part of many large-scale fusion energy initiatives, which attempt to replicate some of the conditions that make the Sun a powerful enough fusion reactor to warm our solar system, with the goal of eventually supplying safe, clean energy for humankind.

If you're using lightweight atoms from the lower end of the periodic table – like the Sun does, fusing hydrogen into helium – the new atom weighs less than the original two combined, and the difference in mass is ejected as thermal energy.

At the core of the Sun, temperatures around 27 million °C (48.6 million °F) fuse about 620 million metric tons of hydrogen into about 616 million metric tons of helium every second, converting some 4 million tons of matter into energy.

A small proportion of this eventually reaches us here on Earth as electromagnetic radiation, supplying us with visible light, ultraviolet light, infra-red, radio waves, X-rays, and gamma rays, and without this generous solar gift of energy, life as we know it would never have been possible.

Tokamak-style fusion reactors like the International Thermonuclear Experimental Reactor (ITER) obviously don't have the colossal scale and gravity of the Sun, but they aim to heat up hydrogen atoms – specifically, deuterium and tritium isotopes – to a point where they begin smashing together, fusing and releasing energy that can both be harvested, and sustain the reaction as additional hydrogen atoms are fed in.

ITER's target temperature is 150 million °C (270 million °F). China's EAST facility, which is a key contributor to the ITER project, has hit this mark already, reaching 160 million °C (288 million °F) for 20 seconds, and holding 120 million °C (216 million °F) for 101 seconds in separate experiments announced last May.

Essentially, the donut shape of the tokamak's inner chamber is lined with the most heat-resistant materials available – tungsten and carbon, for example. Since even these would be destroyed if exposed to hundreds of millions of degrees, the superheated plasma is squashed right into the middle of the chamber, as far from the walls as possible, using powerful magnetic fields.

These extraordinary temperatures are achieved in a tiny amount of plasma relative to the size of the chamber, so the energy dissipates rapidly before it reaches the walls. EAST has not created a fusion reaction, just a sustained, superheated plasma similar to the kind that will eventually be used to create fusion. So it's a long way from being energy-positive at this point.

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