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New dawn: Chinese scientists move step closer to creating ‘artificial sun’ in quest for limitless energy via nuclear fusion

PUBLISHED : Friday, 05 February, 2016, 1:45pm
UPDATED : Friday, 05 February, 2016, 1:45pm
Stephen Chen
chen.binglin@scmp.com

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In a doughnut-shaped chamber in eastern China, scientists have been able to produce hydrogen gas more than three times hotter than the core of the Sun using nuclear fusion - and maintain this temperature for 102 seconds.
The breakthrough puts China one step ahead in the global race to harness a new, artificial kind of solar energy for clean and unlimited energy, the researchers claim. This has become a pressing concern as more of the earth’s natural reserves are rapidly depleting.
The experiment was conducted last week on a magnetic fusion reactor at the Institute of Physical Science in Hefei, capital of Jiangsu province, according to a statement on the institute’s website on Wednesday.
The reactor, officially known as the Experimental Advanced Superconducting Tokamak (EAST), was able to heat a hydrogen gas - a hot ionised gas called a plasma - to about 50 million Kelvins (49.999 million degrees Celsius). The interior of our sun is calculated to be around 15 million Kelvins.
According to this thermodynamic scale, absolute zero occurs at zero degrees (equivalent to minus 273.15 degrees Celsius), a point at which all molecular movement stops.
The temperature reached in Hefei was at the other end of the scale, and roughly the same as a mid-sized thermonuclear explosion. The goal of the experiment was to approximate the nuclear fusion conditions that occur deep inside the sun.
Although at least one other experiment in the last decade claims to have produced a hotter temperatures than this, it has never been duplicated and was unable to match the endurance - over one and a half minutes - of the Chinese test.
Meanwhile, physicists in Japan and Europe have been able to reach the same temperature as the Chinese team, but not for longer than a minute due to concerns of provoking a reactor meltdown.
The EAST was invented by Soviet scientists to control nuclear fusion for power generation.
As a tokamak device, it uses a powerful magnetic field to confine plasma in the shape of a torus - imagine a large spinning doughnut -for safety reasons due to the phenomenally high temperatures being generated. The atoms are effectively held floating in place by superconducting magnets.
But controlling hydrogen gas in such a hot and volatile state is a formidable challenge, and one that most of the tokomak devices built over the last 60 years have not been able to sustain for more than 20 seconds.
The scientists in Hefei worked “day and night” to achieve the record level of endurance, according to the institute, which serves as a subsidiary of the Chinese Academy of Sciences.
The team claimed to have solved a number of scientific and engineering problems, such as precisely controlling the alignment of the magnet, and managing to capture the high-energy particles and heat escaping from the “doughnut”.
But they still missed their mark, which was to reach 100 million Kelvins for over 1,000 seconds (nearly 17 minutes), they said, adding that it would still take years to build a commercially viable plant that could operate in a stable manner for several decades.
Unlike the process of nuclear fission that fuels thermal power stations around the world today by splitting the atoms of fissile materials such as uranium, fusion reactions work by “fusing” two light atomic nuclei - for example, two hydrogen atoms - together to release a huge amount of heat.
This can produce levels of energy three to four times greater than the results of nuclear fission. It also generate almost no radioactive waste.
The problem is the amount of heat created. Whereas nuclear fission only generates a few hundred degrees Celsius, fusion requires at least 100 million degrees Celsius (212 million degrees Fahrenheit).
A researcher involved with the EAST project said data from their experiment may be of use to the International Thermonuclear Experimental Reactor (ITER) that is now under construction in France.
Meanwhile, another 1-billion-euro (US$1.12 billion) project in Germany dubbed the “stellarator” claimed last December to have achieved another milestone in the nuclear fusion quest by heating plasma to around 1 million degrees Celsius for one-tenth of a second.

READ MORE: Blazing at 1 million degrees Celsius, a possible milestone in nuclear fusion quest

China ranks as a member country of the ITER project, which aims to produce 500 megawatts of fusion power for 400 seconds. But Beijing has expressed frustration with the slow pace of development, according to the same researcher, who asked not be identified.
The multibillion US dollar project was initially scheduled to become operational this year. But due to a series of setbacks, many now suspect it will need at least another decade.
“Political infighting among different nations about the project’s budget, personnel appointments and other issues are hampering the pace of the project,” said the researcher.
“If this chaotic situation continues, other projects in countries like the United States and China may overtake this collective, international effort.”

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This article is now closed to comments
crbfile
crbfileFeb 5th 2016
10:21pm
Hefei is the capital of Anhui Province, not Jiangsu.
nathan_kaiser
nathan_kaiserFeb 6th 2016
11:12am
"about 50 million Kelvins" are exactly "about 50 million degrees Celsius"
Are there fact checkers at SCMP, does the reporter have the slightest understanding of physics? I looks like that's not the case for either.
Beaker
BeakerFeb 6th 2016
10:23pm
Chinese searchers also claimed to have picked up the pinger for MH370 near the ending days for the real pinger. Funny to see pictures of the Chinese set up: a dinghy tied off the side of a ship with a man wearing Mickey Mouse headphones dipping what looked like a Swifter handle modified with 2 mics off the end. 1.3 m long. This of course failed to avoid all the surface noise from waves and banging off the hull of the ship. This was why the US and AU navies towed their sonar arrays from 4 km long cables deep beneath the surface. By the time the AU ship got there, the fake Chinese pinger was putting out 27 kHz pings, not the real 37.5 kHz pings from a real pinger. The downward shift is what would be expected of a faked pinger tuned to be correct at the surface when sunk to deeper, denser water. The real mfgr in Sarasota, FL in US said theirs would shift down to 36 kHz. The AU military basically called out the Chinese for deliberately wasting their time with a fake pinger. China has arrived. Yeah! Where? Dunno, but it has arrived, ra ra.
Beaker
BeakerFeb 6th 2016
10:24pm
in reply to: nathan_kaiser
Hi Nathan, 273 degrees between Kelvin vs Celsius on a 50 million scale is practically the same.
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LokFeb 6th 2016
2:17am
Didn't they watched Spiderman? That's how Dr. Octopus got crazy....
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matthewmeleg@******Feb 10th 2016
5:37am
Sorry, I just don`t believe anything the state-run, government controlled media says. Chinese people are good people, but in modern times...the last 20 years or so, all Chinese culture does is emphasize material goods, money, wealth and there is no such thing as "cheating," or "dishonesty," in the minds of Chinese middle age + young people of today. Don`t believe a thing these bull**** artists have to say. And even if they DID make it, its probably going to break within the next couple of years. The modern Chinese can't help but try to cut corners, and do things half-assed in the name of profits.

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