Oak Ridge National Laboratory (ORNL), in a similar story to PPL’s injecting boron powder, has been testing injecting shattered argon pellets into a tokamak. ORNL has been investigating injecting the pellets into a super-heated plasma to protect the walls of the tokamak. It was reported that so far the argon pellets have been the most effective in dissipating runaway electrons.
News from ORNL: https://www.ornl.gov/news/fusion-argon-calling
More here: https://scitechdaily.com/shattered-argon-pellet-injection-technology-for-fusion-reactors/
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