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Re:CERN approves plans for a $23B, 62-mile long super-collider by brnt on Tuesday June 23, 2020 @10:09AM (#23614086)
Accelerator physics would have been unlikely to have progressed as far as it has without HEP. Beam line components for cyclo-/synchrotrons up to proton therapeutic energies are not seen in non HEP facilities (material physics).

FCC of course will not produce spinoffs that have already spun off, but what exactly will spin off we obviously can't predict very precisely.

Re:CERN approves plans for a $23B, 62-mile long super-collider by pfdietz on Tuesday June 23, 2020 @05:24PM (#23620505)
I think you're engaging in a bit of cargo cult thinking here. FCC is analogous to early HEP, but it's an error to think that analogy implies similar outcomes. The sheer scale of FCC argues against similar sorts of direct spinoff. And indirect spinoffs are a poor justification for anything -- they can come from anything, after all, so provide no justification for a specific approach.