Mainz 2014 – scientific programme

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T: Fachverband Teilchenphysik

T 64: Halbleiter 4

T 64.3: Talk

Tuesday, March 25, 2014, 17:15–17:30, P109a

Upgrade of the Beam Condition Monitor in CMS — •Maria Hempel^1,2, Alan Bell³, Anne Dabrowski³, Olena Karacheban^1,2, Wolfgang Lange¹, Wolfgang Lohmann^1,2, Dominik Przyborowski³, Vladimir Ryjov³, and David Stickland⁴ — ¹DESY, Zeuthen, Germany — ²BTU Cottbus, Cottbus, Germany — ³CERN, Geneva, Switzerland — ⁴Princeton University, Princeton, Amerika

The fast beam condition monitor BCM1F is a diamond based particle detector located inside the CMS experiment. A total of 8 diamond sensors with front-end ASICs are positioned on each side of the CMS interaction point to implement online luminosity and halo monitoring. The system was operated during the first running period of the LHC from 2008 until 2012. The particle fluence was 3.5*10e12 cm-2 proton equivalent per fb-1. The sensor performance before and after the irradiation will be compared. In order to meet the enhanced requirements of the LHC after the shutdown due to increased luminosity and a decreased bunch spacing of 25 ns, an upgrade of the system was needed. The new system will comprise 24 single crystal diamond sensors and dedicated front-end ASICs, positioned in a ring on both sides of the interaction point. The characteristics of the diamond sensors and the performance of the full system measured in a test-beam will be presented.