I don't disagree with this: ELMs exist and will remove the inner lining of the containment unit over time, and current cutting edge research is on how a plasma

I don't disagree with this: ELMs exist and will remove the inner lining of the containment unit over time, and current cutting edge research is on how a plasma will react with specific impurities and their distribution within said plasma. It is one of the things that I look forward to from the stellarator folks[1] is their ability to continuously run plasma up against a variety of materials. [1] https://www.ipp.mpg.de/w7x https://www.ipp.mpg.de/w7x