Impaler wrote: … The other ‘indie’ concepts like poly-well, General Fusion etc are more like Internal combustion engines, they could undercut the price of the Steam engine level technology, but Focus Fusion stands alone as the Jet turbine of Fusion concept because it alone is not a heat engine which means it can undercut everything else on price and capitol cost once mature.
… errrr… I think your analogy needs a little work in places… for one thing both Polywell and Tri-Alpha are also aneutronic concepts like Focus Fusion. They also do not boil water and do not require expensive steam turbines 🙂
Focus Fusion does have inherent advantages in minimum size and cost but the comparisons to other aneutronic systems are not as lopsided as that particular analogy would suggest…