Speaker
Description
The High Granularity Calorimeter (HGCAL) will replace the existing Calorimeter Endcaps of the CMS detector as part of the upgrade program for HL-LHC. Proposed for the High Luminosity era, HGCAL’s design addresses its challenges by taking advantage of the radiation tolerance of silicon sensors and advances in the fields of mechanical and electrical engineering. Two main areas of the calorimeter – the electromagnetic and the hadronic sections – are made up of interchanging layers of dense absorber and active sensor. In addition, each active layer is further divided into smaller segments, making the whole structure a highly granular imaging calorimeter. Active layers of the whole electromagnetic section and part of the hadronic section consist of silicon cells smaller than 1 $cm^2$. The rest of the calorimeter is constructed using small scintillator tiles (4 – 30 $cm^2$) coupled to silicon photo-multipliers – the SiPM-on-tile technology. The two sections make up more than 6 million cells, which are small enough to provide good signal-to-noise ratio throughout the detector’s lifetime. The HGCAL will be operated at -30°C to keep the electronics noise sufficiently low. The fine segmentation provides the ability for reconstruction of narrow jets and pile-up rejection, further aided by the timing capabilities of the silicon sensors. The SiPM-on-tile technology is a cost effective method to achieve high granularity in the region of the detector, where the estimated radiation levels do not exceed a fluence of 8x$10^{13}$ $n_{eq}$/$cm^2$. For this region, 280 000 scintillator tiles are being produced, characterized and assembled into the sensitive layer units – tile modules – in the collaborative efforts of US and German institutes. Tile module production is ongoing and estimated to be complete at the end of 2026. In the talk, general design, as well as the status of production of the SiPM-on-tile components will be discussed.
| Position | Doctoral researcher |
|---|---|
| Affiliation | Deutsches Elektronen-Synchrotron DESY |
| Country | Germany |