Nuclear fusion experiment gets under way in Germany
Scientists in Germany have started an experiment they hope will advance the quest for nuclear fusion, considered a clean and safe form of nuclear power.
Following nine years of construction and testing, researchers at the Max Planck Institute for Plasma Physics in Greifswald injected a tiny amount of hydrogen into a doughnut-shaped device - then zapped it with the equivalent of 6,000 microwave ovens.
The resulting super-hot gas, known as plasma, lasted just a fraction of a second before cooling down again, long enough for scientists to confidently declare the start of their experiment a success.
"Everything went well today," said Robert Wolf, a senior scientist involved with the project. "With a system as complex as this you have to make sure everything works perfectly and there's always a risk."
Among the difficulties is how to cool the complex arrangement of magnets required to keep the plasma floating inside the device, said Mr Wolf. Scientists looked closely at the hiccups experienced during the start-up of the Large Hadron Collider in Switzerland more than five years ago to avoid similar mistakes, he said.
The experiment in Greifswald is part of a worldwide effort to harness nuclear fusion, a process in which atoms join at extremely high temperatures and release large amounts of energy.
Advocates acknowledge that the technology is probably many decades away, but argue that - once achieved - it could replace fossil fuels and conventional nuclear fission reactors.
Construction has already begun in southern France on ITER, a huge international research reactor that uses a strong electric current to trap plasma inside a doughnut-shaped device long enough for fusion to take place. The device, known as a tokamak, was conceived by Soviet physicists in the 1950s and is considered fairly easy to build, but extremely difficult to operate.
The team in Greifswald, a port city on Germany's Baltic coast, is focused on a rival technology invented by the American physicist Lyman Spitzer in 1950. Called a stellarator, the device has the same doughnut shape as a tokamak but uses a complicated system of magnetic coils instead of a current to achieve the same result.
The Greifswald device should be able to keep plasma in place for much longer than a tokamak, said Thomas Klinger, who heads the project.
"The stellarator is much calmer," he said. "It's far harder to build, but easier to operate."
Known as the Wendelstein 7-X stellarator, or W7-X, the 400 million euro (£302 million) device was first fired up in December using helium, which is easier to heat. Helium also has the advantage of "cleaning" any minute dirt particles left behind during the construction of the device.
While critics have said the pursuit of nuclear fusion is an expensive waste of money that could be better spent on other projects, Germany has forged ahead in funding the Greifswald project.
Chancellor Angela Merkel, who holds a doctorate in physics, personally pressed the button at Wednesday's launch.
"As an industrial nation we want to show that an affordable, safe, reliable and sustainable power supply is possible, without any loss of economic competitiveness," she said. "The advantages of fusion energy are obvious."
Although it is not designed to produce any energy itself, scientists hope that over the coming years W7-X will test many of the extreme conditions such devices will be subjected to if they are ever to generate power.