Gießen 2024 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 16: Instrumentation III

HK 16.3: Talk

Tuesday, March 12, 2024, 16:30–16:45, HBR 19: C 1

Material budget studies for the ALICE ITS3 — •Simon Groß-Bölting for the ALICE Germany collaboration — Physikalisches Institut, Universität Heidelberg, Germany

During the LHC Long Shutdown 3 (LS3), ALICE plans to replace the innermost three layers of the current Inner Tracking System (ITS2) to a new version. The ITS3 will consist of ultra-thin cylindrically bent silicon sensors, which are held in place by lightweight carbon foam spacers. The carbon foam will be attached to the silicon sensors using glue and carbon fleeces, a material similar to Velcro. Due to the porosity of the fleece, the distribution of the glue layer may vary, especially as capillary effects become significant, and this variability can have an impact on the material budget. Knowing the material budget as precise as possible is crucial for simulating collisions and reconstructing the trajectories of the produced charged particles. To investigate the properties of materials and determine their associated radiation length, test beam experiments are conducted which yield information about the multiple scattering angle of charged particles as they traverse the material under study.

This talk will highlight the preparatory steps taken for an upcoming DESY test beam. The objective is to perform a material budget tomography using electrons on various material samples intended for use in the final ITS3, in order to evaluate the different material budget contributions. To prepare for the analysis a test beam with an Aluminium target as a well-known scatterer has been done with a proton beam in Marburg in fall 2023 and a short overview will be presented.

Keywords: ITS3; material budget; ALICE; scattering experiment; test beam