Tevatron Saw the Haiti Earthquake January 19, 2010Posted by gordonwatts in D0, Fermilab, physics, physics life.
What you are looking at there is an ACNET plot. I stare at plots similar to this when I’m on shift all the time. The top two plots – the green and red, are position monitors on the quadruple magnets just outside CDF and D0. They are quite stable until the earthquake. The Tevatron was running when this happened, and you can see in that lower red plot that some protons were knocked out of the ring by the ground shaking.
Note these movements are so small you never would have been able to detect them unaided. However, as my wife put it, “that is one expensive seismograph!” :-)