Göttingen 2012 – scientific programme
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T: Fachverband Teilchenphysik
T 60: Detektorsysteme
T 60.9: Talk
Wednesday, February 29, 2012, 18:45–19:00, VG 2.102
Beam Conditions Monitors at CMS and LHC using Diamond Sensors — •Maria Hempel1,2, Maria-Elena Castro-Carballo1, Wolfgang Lohmann1,2, Wolfgang Lange1, Roberval Walsh3, and Olga Novgorodova1 — 1Desy-Zeuthen, Platanenallee 6, 15738 Zeuthen — 2Brandenburgische Technische Universität Cottbus, Konrad-Wachsmann-Allee 1, 03046 Cottbus — 3Desy-Hamburg, Notkestraße 85, 22607 Hamburg
The Fast Beam Conditions Monitor (BCM1F) is a particle detector based on diamonds. Eight modules comprising a single crystal diamond, front-end electronics and an optical link are installed on both sides of the interaction point inside the tracker of the CMS detector. The back-end uses ADCs, TDCs and scalers to measure the amplitudes, arrival time and rates of beam-halo particles and collision products. These data are used to protect the inner tracker from adverse beam conditions, perform a fast monitoring of the luminosity and e.g. beam-gas interactions. Recently two additional BCM1F modules have been installed at other positions of the LHC to supplement the beam-loss monitors by a flux measurement with nanosecond time resolution. In the talk essential parameters of the system are presented and examples of beam conditions monitoring are reported.