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In the CMS detector a series of beam condition monitors were installed and are in operation for measuring radiation doses and preventing possible damages to the detector in case of beam losses. The Fast Beam Condition Monitor, BCM1F, is installed inside the pixel volume close to the beam pipe and it consists of two planes of 4 modules each located 1.8 m away from the IP, on both sides. It uses single-crystal CVD diamond sensors and radiation hard front-end electronics, along with an optical transmission of the signal. It was designed for fast flux monitoring, measuring beam halo and collision products on a bunch by bunch basis. Early in November 2009 the LHC restarted running with beams and since then BCM1F has been recording data from beam halo, beam studies, proton-proton and lead-lead collisions. It is an invaluable tool in everyday CMS operation and, due to the high sensitivity to beam conditions, is providing the so called Background (BKGD) 1 to LHC operators. A characterization of the system on the basis of data collected during LHC operation will be presented.
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