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HK: Fachverband Physik der Hadronen und Kerne

HK 2: Instrumentation 1

HK 2.3: Vortrag

Montag, 23. März 2015, 15:15–15:30, M/HS1

A custom made wafer probe for strip detector quality assurance of the CBM — •Iaroslav Panasenko for the CBM collaboration — Physikalisches Institut, Universität Tübingen — Institute for Nuclear Research, Kiev, Ukraine

The CBM experiment will investigate the properties of nuclear matter at extreme conditions created in ultrarelativistic heavy-ion collisions. Its key detector — the Silicon Tracking System (STS) — will reconstruct particle tracks with momentum resolution of ∼1% and charged particle multiplicity up to 600 within the detector aperture covering the polar angle between 2.5^∘ and 25^∘. High track density as well as stringent requirements to the momentum resolution require system with high channel granularity and low meterial budget. The STS will be constructed of about 1300 double-sided silicon microstrip detectors with total area of ∼4 m² and have 2.1 million channels. The microstrip sensors with 58 µm pitch and 62×62 mm² area will have pad size of 180×60 µm².

Due to the large size, the CBM microstrip sensors are not well suited for the characterization at conventional probe stations. Therefore, a custom probe station is beeing developed at Tübingen University. One of the main requirements is a repeatability better than 1 µm to allow an automatic succesive positioning on all 1024 pads of a sensor. The construction of the probestation and first measurements will be presented.