Doug Berry's blog

Two weeks ago I spent a large amount of my time in the Meyrin CMS Center. The CMS Center is a centrally located control center where a lot of offline shifters monitor detector components. Shifters there monitoring varies sub-detectors; such as the the strip tracker, the pixel detector, and the muon systems. I was there for a week monitoring the data from the early collisions.

The Offline DQM shift consists of monitoring most of the detector sub-components and entering their status into an online database called the run registry. Each sub-detector, Castor, Cathode Strip Chambers, Drift Chambers, ECAL, HCAL, HLT, L1 Trigger, Pixel Detector, RPC, and Strip Tracker, and physics object, EGamma, JetMET, Muon, and tracker, must be certified by the offline DQM shifter. Below is an image of the tools that I used on the DQM offline shifts to monitor the detector performance.

The DQM shift start at 07:00, 2 hours earlier then the other shifts at the Meyrin center, so I got the CMS center all to myself.

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Over the past couple of weeks I have been on shift with the CMS ECAL. These shifts consist of monitoring the ECAL while it records data. The person on shift makes sure everything is working properly, and if something breaks, they inform the appropriate expert. When a person is on shift there are a lot a monitoring tools they can look at. Most of a shifter’s time is spent monitoring the DCS controller, the ECAL DAQ, the XMAS monitor, and the DQM. The DCS controller monitors the voltages, currents, and temperatures of the detector. The ECAL DAQ system reads the data from the ECAL. The XMAS tree monitor displays information about the ECAL DAQ. The DQM monitors the data as it is read from the detector. Below is an image of what I look at on shift.

Inside the control room there are three large monitors. One which displays general information about the run, another has an event display, and a third which displays the beam status (image below).

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