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Frozen bullets tame unruly edge plasmas in fusion experiment
Using a frozen hydrogen machine gun installed on the DIII-D magnetic fusion plasma experiment in San Diego, researchers were able to fire millimetre-sized pellets of frozen hydrogen into the edge of a 20 million degree fusion plasma, dramatically reducing the size of periodic edge disturbances called ELMs, which are similar to solar flares at the surface of the sun.
"The rapid-fire frozen-pellet machine gun technology actually triggers many smaller disturbances, effectively short-circuiting the plasma's natural tendency to have less requent, but much larger outbursts," said Dr. Larry Baylor of Oak Ridge National Laboratory, where the pellet gun was designed and built.
At the Korea Institute of Fusion Energy (KFE), the KSTAR tokamak recommenced operations in December after a major upgrade to replace the…
KSTAR aims for longer plasmas
At the Korea Institute of Fusion Energy (KFE), the KSTAR tokamak recommenced operations in December after a major upgrade to replace the device's carbon divertor with a tungsten divertor.
According to an on the KFE website, the original carbon divertors could take a thermal load of 5MW/m², whereas the tungsten divertor can take 10MW/m². The upgrade is critical to the goal of sustaining a 100-million-degree plasma for 300 seconds by 2026. Data from the operational campaign will be directly relevant to °ÄÃÅÁùºÏ²Ê¸ßÊÖ, which will operate a tungsten divertor under similar plasma conditions in terms of shape and structure.
This testing campaign will continue through February 2024. Read more about the plans in this in English on the KFE website, or in Korean in the .