München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 54: Poster

HK 54.61: Poster

Thursday, March 21, 2019, 16:30–19:00, Foyer Theresanium

Sensor Quality Assurance for the CBM Silicon Tracking System — •Iaroslav Panasenko — Physikalisches Institut, Universität Tübingen, Germany — Institute for Nuclear Research, Kiev, Ukraine

The CBM experiment at FAIR will investigate the properties of nucler matter at extreme conditions created in ultrarelativistic heavy-ion collisions. Its core detector — the Silicon Tracking System (STS) — will determine the momentum of charged particles from beam-target interactions. The high track multiplicity (up to 700 within the detector aperture) as well as stringent requirements to the momentum resolution (∼2% at p ≥ 1 GeV/c) require a system with high channel granularity and low material budget.

The STS will be constructed of about 900 double-sided silicon microstrip sensors with a total area of ∼4 m². CBM microstrip sensors have 1024 readout strips per side with 58 µ m pitch, thus, resulting in about 1.8 million channels. The fraction of the defective strips per sensor has to be less than 1.5 % to guarantee the expected STS performance. The mission of quality assurance (QA) is to ensure that the manufactured sensors correspond to the CBM specifications. For this purpose, dedicated equipment including a custom-built probe station has been set up in the clean room at the Tübingen University. Advanced QA methods were developed and successfully applied for the CBM microstrip sensors. Results of the characterization of the prototype microstrip sensors CBM06 will be presented.

Work supported by BMBF under grant 05P12VTFCE.