FWIW the LEP collider accelerated electrons to 104.5 GeV: https://en.wikipedia.org/wiki/Large_Electron%E2%80%93Positron_Collider https://en.wikipedia.org/wiki/

FWIW the LEP collider accelerated electrons to 104.5 GeV: https://en.wikipedia.org/wiki/Large_Electron%E2%80%93Positron_Collider https://en.wikipedia.org/wiki/Large_Electron%E2%80%93Positro... But that was a ring five miles across, not a sphere roughly the size of a sumo wrestler.