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T: Fachverband Teilchenphysik
T 64: Halbleiter 4
T 64.2: Vortrag
Dienstag, 25. März 2014, 17:00–17:15, P109a
Upgraded Fast Beam Conditions Monitor for CMS online luminosity measurement — •Jessica L Leonard1, Piotr Burtowy2, Anne Dabrowski3, Maria Hempel1,4, Hans Henschel1, Wolfgang Lange1, Wolfgang Lohmann1,4, Nathaniel Odell5, Marek Penno1, David Stickland6, Roberval Walsh7, and Agnieszka Zagozdzinska8 — 1DESY, Zeuthen, Germany — 2Gdansk U of Tech, Gdansk, Poland — 3CERN, Geneva, Switzerland — 4Brandenburg Tech U, Cottbus, Germany — 5Northwestern U, Evanston, IL, USA — 6Princeton U, Princeton, NJ, USA — 7DESY, Hamburg, Germany — 8Warsaw U of Tech, Warsaw, Poland
The Run I CMS beam conditions monitoring subsystem BCM1F consisted of 8 individual diamond sensors situated around the beam pipe within the pixel detector volume, for the purpose of fast bunch-by-bunch monitoring of beam background and collision products. Effort is ongoing to develop the use of BCM1F as an online luminosity monitor. BCM1F will be running whenever there is beam in LHC, and its data acquisition is independent from the data acquisition of the CMS detector, hence it delivers luminosity even when CMS is not taking data. In order to match the requirements due to higher luminosity and 25 ns bunch spacing, several changes to the system must be implemented. These include using more sensors and upgraded electronics. New back-end instrumentation was developed, in particular dedicated fast logic and a real-time digitizer with large memory, and is being integrated into a multi-subsystem framework for luminosity measurement. Current results from Run II preparation will be shown.