Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 41: Calorimeters 1

T 41.3: Vortrag

Dienstag, 22. März 2022, 16:45–17:00, T-H26

Studies of Irradiated SiPMs with HGCAL Tileboards — •Malinda de Silva, Mathias Reinecke, Katja Krüger, Ole Bach, and Felix Sefkow — Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany

For the HL-LHC phase, the calorimeter endcap of the CMS detector will be upgraded with a High Granularity Calorimeter (HGCAL), a sampling calorimeter that will use silicon sensors as well as scintillator tiles read out by silicon photomultipliers (SiPMs) as active material (SiPM-on-tile). The complete HGCAL will be operated at −30^∘C. The SiPMs will be used in areas where the expected radiation dose during the lifetime of the detector is up to 5×10¹³ n_eq/cm². The basic detector unit in the SiPM-on-tile part is the tile module, consisting of a PCB with one or two HGCROC ASICs, reading out up to 96 tiles with SiPMs. The design of the SiPM-on-tile part is inspired by the CALICE AHCAL.

In the calorimeter, the response of each SiPM-on-tile on the energy scale will be calibrated using the MIP signal. This is compromised by radiation damage decreasing the scintillator light output and increasing the SiPM dark current induced noise. SiPM irradiation tests provide data on the current increase as a function of accumulated neutron fluence. From this increase in current the increase in noise for a fixed SiPM bias voltage can be predicted. Tests were conducted on SiPMs irradiated to 2×10¹² n_eq/cm² mounted on a tileboard, at temperatures ranging between −30^∘C and +30^∘C using a climate chamber. Results from these tests will be reported.