"Silicon Detectors for the CMS Endcap Calorimeter at HL-LHC" by Florian Pitters (CERN)

Monday, 7 May 2018 from to (Europe/Vienna)
at HEPHY ( Library )
Nikolsdorfer Gasse 18, 1050 Wien
The CMS experiment is currently developing highly granular calorimeter end-caps for its HL-LHC upgrade (CMS HGCAL). The electromagnetic section as well as the inner part of the hadronic section foresee silicon pad sensors as the active material, interleaved with absorbers made from mostly lead and steel. This technology is similar to the silicon-based ECAL developed by the CALICE collaboration for a linear collider environment.  However, the challenges of HGCAL are rather different, particularly due to the unprecedented radiation and pile-up environment of the HL-LHC. The sampling calorimeter will be constructed from 8 inch hexagonal silicon sensors, each with pads of 50 to 100 mm^2 area and a readout PCB glued directly unto the sensor. To route the signals from the sensor contact pads to the readout ASIC, deep-wire bonds passing through holes in the readout PCB are foreseen. Prototype modules on 6 inch sensors have been constructed and tested in beams at FNAL and at CERN. 
The talk will give an overview of the CMS HGCAL project, the motivation and experimental realisation. The talk will then focus on the silicon sensors, their characterisation, prototyping and testbeam performance with a special emphasis on the calibration and precision timing capabilities.