Silicon Detector R&D
Silicon is ubiquitous. It is the most common, versatile, and pure material in the electronics industry, and it lends itself to myriad applications in particle physics detectors. One of our main activities involves using a large quantity of planar silicon sensors (600 m2) in the high granularity calorimeter (HGCAL) in the Compact Muon Solenoid (CMS) at the High Luminosity Large Hadron Collider (HL-LHC). When completed in 2025, the integrated neutron fluences will exceed 1016 neutrons per cm2 for the HGCAL, so it is absolutely critical that we understand the processes that are at work in radiation damage and are able to simulate and quantitatively predict diminishing detector performance under irradiation for any application. In the last year, we have been investigating many different test structures and characterizing their properties. Some of the results are in our paper "Charge Collection and Electrical Characterization of Neutron Irradiated Silicon Pad Detector for the CMS High Granularity Calorimeter," which has just been published in JINST. Our team continues to investigate new types of silicon detectors for future applications through TCAD simulations, sample fabrication, and characterization.