Mainz 2022 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 14: Instrumentation IV
HK 14.3: Vortrag
Montag, 28. März 2022, 17:00–17:15, HK-H3
Material budget imaging of carbon foam support structures using ALPIDE sensors — •Bogdan Mihail Blidaru for the ALICE collaboration — Physikalisches Institut, Heidelberg University, Germany
During the next LHC Long Shutdown, ALICE plans to replace the three innermost layers of the recently upgraded Inner Tracking System (ITS2) with a novel vertex detector based on wafer-scale, ultra-thin, truly cylindrical Monolithic Active Pixel Sensors (MAPS). The new sensors will be thinned down to 20-40 µm, featuring an unprecedented low material budget of less than 0.05% x/X0 per layer and will be arranged concentrically around the beam pipe, as close as 18 mm from the interaction point.
To reach such ultra low material budget levels, the routing of power and signals will be integrated onto the sensor and the water cooling and mechanical support will be removed. A series of ultra-lightweight half-ring spacers, made of open cell carbon foam will be instead used in the active area. They will be inserted between the sensor layers to define their relative radial position and offer mechanical support.
To study the effects of scattering, carbon foam wedges of different proposed materials are tested in a high-resolution ALPIDE telescope using electron beams in the GeV-range at the DESY Test Beam Facility. The material budget is estimated with good accuracy by measuring the position-resolved scattering angle distribution of the beam particles. The foam structure is properly resolved and good agreement between expectations and data is found.