Speaker
Nural Akchurin
(Texas Tech University (US))
Description
The High Granularity Calorimeter (HGCAL) is the technology choice of the CMS collaboration for the endcap calorimetry upgrade planned to cope with the harsh radiation and pileup environment at the High Luminosity-LHC and to optimally reconstruct physics objects such as electrons, photons and jets. In this context, profiting from fast-timing information (~tens of picoseconds) embedded in the calorimeter would represent a unique capability for resolving information from individual collisions at the HL-LHC. This will enhance the reconstruction and physics capabilities of the CMS detector in terms of pileup mitigation and particle identification. The HGCAL is realized as a sampling calorimeter, including 40 layers of silicon pad detectors with pad areas of 0.5 — 1.0 cm$^2$ and three active thicknesses: 320, 200 and 120μm. Prototype p-in-n and n-in-p 5$\times$5mm$^2$ silicon pads, with thicknesses of 285, 211 and 133μm, were tested with high-energy electrons at the CERN SPS. We present the motivation for this study including the concept and use of fast-timing in the HGCAL, and the measured intrinsic timing capabilities for electromagnetic showers and minimum-ionising particles.
(on behalf of the CMS Collaboration)
Author
Nural Akchurin
(Texas Tech University (US))
