A new Beam Halo Monitor system for CMS: Development, Installation and First Beam results

by Stella Orfanelli (National Technical Univ. of Athens (GR))

Friday 19 Jun 2015, 11:00 → 12:00 Europe/Zurich

40/S2-A01 - Salle Anderson (CERN)

A new Beam Halo Monitor (BHM) system has been designed and built in the CMS experiment. BHM will provide an online bunch-by-bunch measurement of the background induced by proton losses in the machine arriving at high radius from the LHC tunnel into CMS cavern . The BHM system consists of 20 azimuthally distributed detectors per CMS end, situated around the rotating shielding (r ~ 180 cm , 20.6 m from the interaction point). Each detector comprises a cylindrical quartz Cherenkov radiator read out on one end by a fast UV-sensitive photomultiplier tube and black painted on the other end. This design allows a prompt, direction-sensitive measurement of the halo particles and a good separation from the dominant collision debris. The BHM system has been installed during LHC long shutdown 1 (LS1) and is now ready to be commissioned and to provide rigorous feedback to LHC on the beam quality.

Poster CERNDetectorSeminar19.06.2015.pdf

Slides BHM_JointSeminar.pdf