München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 30: Instrumentation VI

HK 30.3: Talk

Tuesday, March 19, 2019, 17:30–17:45, HS 11

MIMOSIS, a CMOS sensor for the CBM Micro Vertex Detector* — Michael Deveaux and •Michal Koziel for the CBM-MVD collaboration — Goethe Universität Frankfurt am Main

The Compressed Baryonic Matter Experiment (CBM) is one of the core experiments of the future FAIR facility at Darmstadt/Germany. Its Micro Vertex Detector (MVD) will determine the secondary decay vertex of open charm particles with ∼ 50 µ m precision, contribute to the background rejection in dielectron spectroscopy and help to reconstruct neutral decay products of strange particles by means of missing mass identification.

The MVD will be operated with a dedicated CMOS Monolithic Active Pixel Sensor named MIMOSIS, which is being developed by the PICSEL group of the IPHC Strasbourg. Its design relies on the pixel array read-out architecture of the ALPIDE sensor developed for the ALICE ITS upgrade and extends its rate capability by more than one order of magnitude. Moreover, the fixed target geometry of the MVD creates specific challenges including strong gradients in the track density and radiation load, a bombardment with direct beam ions and substantial beam intensity fluctuations.

We will discuss the requirements for the sensor technology and introduce the solutions foreseen in the MIMOSIS sensor. Moreover, test results from the first sensor prototype named MIMOSIS-0 will be reported.

*This work has been supported by BMBF (05P15RFFC1), GSI and HIC for FAIR.