Abstract
The readout electronics of the ATLAS Hadronic Endcap Calorimeterwill have to withstand an about 3–5 times higher radiation dosesat the future high-luminosity LHC compared to the LHC design values.The radiation damages of the front-end electronics made in GaAs technologycould significantly affect the hadronic endcap calorimeter performance. Recentmeasurements of characteristics of neutron and proton irradiated ASICs atroom and liquid argon temperatures are reported, which allow an improvedassessment of the expected degradation in high-luminosity LHC conditions.The results of these measurements are furthermore applied to simulations ofthe calorimeter performance. Results from replacement technologies, like Si CMOS,are also presented.
Highlights
The ATLAS Detector & Calorimeter system at HL-LHC The Hadronic End‐caps (HEC) and cold electronics, expected radiation levels Proton & neutron tests and HEC electronics degradation Simulation algorithm & results Conclusions
4x32 modules, 5632 readout channels Signals are sent from read-out pads to the preamplifier and summing boards (PSBs) We use GaAs FET technology Electronics is located at the outer surface of the wheel inside the cryostat
HEC is operated at HV of 1.8 kV critical intensity ~4.0 × 108 p/s, which is well above the HL-LHC requirements
Summary
Topical Workshop on Electronics for Particle Physics Perugia, Italy, September 23-27, 2013. The ATLAS Detector & Calorimeter system at HL-LHC The HEC and cold electronics, expected radiation levels Proton & neutron tests and HEC electronics degradation Simulation algorithm & results Conclusions
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