Upgraded Fast Beam Conditions Monitor for CMS online luminosity measurement

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Beurs van Berlage

Beurs van Berlage

Poster Experiments: 2a) Experiments & Upgrades


Jessica Lynn Leonard (Deutsches Elektronen-Synchrotron (DE))


The CMS beam and radiation monitoring subsystem BCM1F during LHC Run I consisted of 8 individual diamond sensors situated around the beam pipe within the tracker detector volume, for the purpose of fast monitoring of beam background and collision products. Effort is ongoing to develop the use of BCM1F as an online bunch-by-bunch 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. To prepare for the expected increase in the LHC luminosity and the change from 50 ns to 25 ns bunch separation, several changes to the system are required, including a higher number of sensors and upgraded electronics. In particular, a new real-time digitizer with large memory was developed and is being integrated into a multi-subsystem framework for luminosity measurement. Current results from Run II preparation will be shown, including results from the January 2014 test beam.

Primary author

Jessica Lynn Leonard (Deutsches Elektronen-Synchrotron (DE))


Agnieszka Anna Zagozdzinska (Warsaw University of Technology (PL)) Alan James Bell (Deutsches Elektronen-Synchrotron (DE)) Anne Dabrowski (CERN) David Peter Stickland (Princeton University (US)) Dominik Wladyslaw Przyborowski (AGH University of Science and Technology (PL)) Mr Hans Henschel Henschel (DESY) Marek Penno (Deutsches Elektronen-Synchrotron (DE)) Maria Hempel (Deutsches Elektronen-Synchrotron (DE)) Olena Karacheban (D) Piotr Rafal Burtowy (Gdansk University of Technology (PL)) Roberval Walsh Bastos Rangel (Deutsches Elektronen-Synchrotron (DE)) Vladimir Ryjov (CERN) Dr Wolfgang Lange (DESY) Wolfgang Lohmann (DESY)

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