I'm writing a science fiction novel where a linear accelerator buried underground has to explode. Above the linear accelerator is an enormous server room which ideally would be heavily damaged. Atop that rests the main scientific compound which ideally should have minimal damage. The protagonists are trying to destroy the accelerator and its data without loss of life.
I've been doing some research and figured intentionally scattering the beam of protons inside the accelerator could strike the superconducting magnets in the accelerator. If enough magnets were hit, it would seem to cause a relatively small explosion. I was thinking of flooding the accelerator chamber with a mixture of hydrogen and oxygen to further increase the explosive output. If this enormous accelerator chamber was flooded with explosive gas, could it in theory destroy the chamber and "Floor" above without doing much more damage than that?