> Magnets so strong would need thousands of tons of steel to hold them in place, which would weaken rapidly under heavy hot neutron bombardment. I'm just going

> Magnets so strong would need thousands of tons of steel to hold them in place, which would weaken rapidly under heavy hot neutron bombardment. I'm just going to nitpick this part. In ARC, the magnets go outside the blanket, which is a molten salt, fully surrounding the inner wall. The salt has to absorb almost all the neutrons, to generate enough tritium. The steel outside of that shouldn't be getting many neutrons.