Interesting, thanks for the info.

I was always somewhat concerned about the abundance of critical raw materials for ARC or other fusion projects. I had assumed that the rare-earth elements in the REBCO tape, e.g. yttrium, would be constrained. I didn't suspect that beryllium could be a limiting resource. But I wonder if the lack of supply is related to true scarcity or just to a lack of a profitable market currently.

These are all questions I'd want to ask domain experts in mining and fusion.

But I agree that fission would be a better solution for baseload, at least for the next 10-20 years. If only newer modular designs were actually approved...