High Energy Physics Seminars

The CMS High Granularity Calorimeter : design, commissioning and performance of prototype silicon modules at the beam test.

by Dr. Rajdeep M. Chatterjee (University of Minnesota, USA.)

Friday, August 6, 2021 from to (Asia/Kolkata)
Description
Calorimetry at the High Luminosity-Large Hadron Collider faces two enormous challenges particularly in the forward direction: radiation tolerance and unprecedented in-time event pileup. To meet these challenges, the CMS experiment has decided to replace its current endcap calorimeters with a High Granularity Calorimeter (HGCAL), featuring a previously unrealized transverse and longitudinal segmentation, for both the electromagnetic and the hadronic compartments.
As part of the development of this calorimeter, a series of beam tests have been conducted using prototype segmented silicon detectors. In one of the recent tests, conducted at the CERN SPS, the performance of a prototype calorimeter equipped with ≈12,000 channels of silicon sensors was studied with beams of high-energy electrons, pions and muons with momenta ranging from 20 to 300 GeV/c. In this seminar I will begin with an introduction to the overall CMS HGCAL design and then focus on the design, commissioning and performance of the HGCAL beam test prototype. The custom-built, scaleable data acquisition system, that was built with readily available FPGA mezzanines and low-cost Raspberry Pi computers, the event reconstruction scheme and the data analysis techniques will be discussed in detail. I will conclude with some hot-off-the-press results of a deep learning based event reconstruction technique that have shown promising results in the hadronic reconstruction performance.