Ultima Thule

In ancient times the northernmost region of the habitable world - hence, any distant, unknown or mysterious land.

Friday, September 29, 2006

China Carries Out Test of Fusion Reactor - Newsday.com

By Aussiegirl

I will let two smart posters from Lucianne.com lend their expertise to this article:

901AtTheRiver wrote:

"Cheng said the test was considered a success because the reactor produced plasma, a hot cloud of supercharged particles. She wouldn't give other details."

Producing a plasma is the easy part. Keeping the plasma stable and intense enough to produce neutrons indicating actual fusion has been done here in the U.S., but making it produce more power than it consumes has been the challenge that has drained the budgets.

veritas wrote:

[...]Absolutely right. It only takes the expenditure of energy to create plamsa [pumping enough energy in so that the electrons can't be held by their nuclei].

Containing that brew, and in such a way that more energy can be drawn off over a sustained time [that's magnetic-containment fusion; or in a long series of repeatable bursts, as in laser-contained fusion], as they say, is a bit more difficult. Plasma tends to kink.

My suspicion is that we need some new insight in physics to master magnetic containment.

China Carries Out Test of Fusion Reactor - Newsday.com

Scientists on Thursday carried out China's first successful test of an experimental fusion reactor, powered by the process that fuels the sun, a research institute spokeswoman said.

China, the United States and other governments are pursuing fusion research in hopes that it could become a clean, potentially limitless energy source. Fusion produces little radioactive waste, unlike fission, which powers conventional nuclear reactors.

Beijing is eager for advances, both for national prestige and to reduce its soaring consumption of imported oil and dirty coal.

The test by the government's Institute of Plasma Physics was carried out on a Tokamak fusion device in the eastern city of Hefei, said Cheng Yan, a spokeswoman at the institute.

Cheng said the test was considered a success because the reactor produced plasma, a hot cloud of supercharged particles. She wouldn't give other details.

"This represents a step for humankind in the study of nuclear reaction," she said.

U.S. and other scientists have been experimenting with fusion for decades but it has yet to be developed into a viable energy alternative.

"I think it is a considerable step ahead for China," said Karl Heinz Finken, a senior scientist at the Institute for Plasma Physics in Juelich, Germany, who had no role in the Chinese research.

"China is speeding up with the development of nuclear fusion and I think at the moment they are making considerable progress," he said.

The Chinese facility is similar to the International Thermonuclear Experimental Reactor, or ITER, being built by a seven-nation consortium in Cadarache in southern France, according to state media. That reactor is due to be completed in 2015.

China is a partner in the ITER reactor, along with the European Union, the United States, Japan, Russia, India and South Korea.

A Tokamak reactor uses a doughnut-shaped magnetic field to contain the hot gas.

Several countries have produced plasma using a Tokamak or similar device, said Gabriel Marbach, deputy head of fusion research at the ITER facility. He said producing plasma was only one step toward the fusion that ITER aims to perform, and that the project could be helped by the Chinese experiments.


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