Beam collision
When the collider is commissioned, the beams will cross paths at allotted points along the tunnel, smashing into one another with cataclysmic force.

Dr. Egon Spengler: There’s something very important I forgot to tell you.
Dr. Peter Venkman: What?
Dr. Egon Spengler: Don’t cross the streams.
Dr. Peter Venkman: Why?
Dr. Egon Spengler: It would be bad.
Dr. Peter Venkman: I’m fuzzy on the whole good/bad thing. What do you mean, “bad”?
Dr. Egon Spengler: Try to imagine all life as you know it stopping instantaneously and every molecule in your body exploding at the speed of light.
Dr Ray Stantz: Total protonic reversal.
Dr. Peter Venkman: Right. That’s bad. Okay. All right. Important safety tip. Thanks, Egon.

maaaayyyyybeeeee they should watch ghostbusters again.