Physicists at the University of Wisconsin–Madison produced a tokamak plasma that is stable at 10 times the Greenwald limit.
Physicists from the University of Wisconsin–Madison have developed a tokamak plasma that is stable at ten times the Greenwald limit. Their achievement is expected to have implications for tokamak fusion reactors. However scientists have cautioned that their plasma is not directly comparable to that in a fusion reactor.
Almost 40 years ago, Martin Greenwald identified a density limit above which tokamak plasmas become unstable, and the so-called Greenwald limit has, at best, been exceeded by a factor of two in the ensuing decades.devices are considered a leading contender in the race to build a nuclear fusion reactor that generates power in the same way as the Sun,” says Noah Hurst, a scientist with the Wisconsin Plasma Physics Laboratory and lead author on the study.
They set the power supply to provide whatever voltage was needed to maintain a steady 50000 amps of current in each plasma . They measured the achieved plasma density with interferometers viewing the plasma along 11 different lines of sight. , the Greenwald limit is just the ratio of the plasma density to the product of the plasma current and plasma size, a simple metric that allows comparison of different devices and operating conditions.
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