This is a bit late, but better than never.
I wrote an entry earlier on Accelerator Physics, and how many people do not actually understand what it is and why it is different than particle smasher. I have examples where linear accelerators can in fact already be present in your hospitals. It turns out that the medical linear accelerator celebrated its 50th Anniversary this past April.
This is one very clear example where the advancement made in one field provides a new opportunity and technique in another. And no one reading this should make the mistake anymore of confusing "particle accelerator" with "particle collider". :)