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- M. Hempel, H.M. Henschel, O. Karacheban, W. Lange, J.L. Leonard, M. Penno
DESY Zeuthen, Zeuthen, Germany
- K. Afanaciev
NC PHEP BSU, Minsk, Belarus
- A.I. Bell
DLS, Oxfordshire, United Kingdom
- P.R. Burtowy, A.E. Dabrowski, R. Loos, V. Ryjov, A.A. Zagozdzinska
CERN, Geneva, Switzerland
- W. Lohmann
BTU, Cottbus, Germany
- W. Lohmann, R. Walsh
DESY, Hamburg, Germany
- B.L. Pollack
NU, Evanston, Illinois, USA
- D. Przyborowski
AGH, Cracow, Poland
- S. Schuwalow
Uni HH, Hamburg, Germany
- D.P. Stickland
PU, Princeton, New Jersey, USA
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The Fast Beam Condition Monitor BCM1F is a diamond based particle detector inside CMS. It is based on 8 single crystal CVD diamond sensors on both ends of the interaction point and is used for beam background and luminosity measurements. The system has been operated up to an integrated luminosity of 30fb-1, corresponding to a particle fluence of 8.78·1013 cm-2 (24GeV proton equivalent). To maintain the performance at a bunch spacing of 25ns and at the enhanced luminosity after the LHC Long Shutdown LS1, an upgrade of BCM1F is necessary. The upgraded system features 24 single crystal diamond sensors with a two pad metallization, a very fast front-end ASIC built with 130nm CMOS technology and new back-end electronics. A prototype of the upgraded BCM1F components were studied in the 5GeV electron beam at DESY. Measurements were done on the signal shape as function of time, the collection efficiency as a function of voltage and position of the impact point on the sensor surface. The preliminary results of this testbeam will be presented. In addition, the status of the new upgraded BCM1F will be given.
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