I am guessing those are Cockcroft-Walton accelerators and that is the first stage of a larger particle accelerator. The pools on the right might provide some clue. They could be there for cooling or radiation shielding, or both.
ik I'm late, but this looks like an electrical substation (picrel as a refference) to me, just that it's indoors and probably built specificly for another installation
EDIT: I just saw the AC sticker on it, which would support my theory