posted by: dberry
I was on DQM online shift on Sunday and we were preparing the detector for stable beams. While this was happening the LHC was injecting probe beams in the accelerator to verify that the LHC is functioning correctly. After they were done circulating the probe beams they are dumped into a beam stop, which is a big chunk of metal. When this happens the beam produces a huge shower of particles, most of which decay to muons. These enter the detector and make crazy looking events like the one below. The red lines are incorrectly reconstructed muons from hits in the cathode strip chambers.
Tags: Particle Physics