Slac fires particles along a track
They do, but this research was done with a storage ring, PEP-II. The SLC is used as an injector for it, however.
It's not surprising that I'm not up to date in this exotic field, but I didn't expect to be totally blindsided by something. How long has this been going on? I assume this is the reason that no free quarks exist in nature. Still, it's a darn curious thing.