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The readout electronics of the ATLAS Hadronic Endcap Calorimeter will have towithstand the about ten times larger radiation environment of the futurehigh-luminosity LHC (HL-LHC) compared to their design values. The GaAs ASICwhich comprises the heart of the readout electronics has been exposed toneutron and proton radiation with fluences up to ten times the total expectedfluences for ten years of running of the HL-LHC. Neutron tests were performedat the NPI in Rez, Czech Republic, where a 36 MeV proton beam is directed on athick heavy water target to produce neutrons. The proton irradiation was donewith 200 MeV protons at the PROSCAN area of the Proton Irradiation Facility atthe PSI in Villigen, Switzerland. In-situ measurements of S-parameters in bothtests allow the evaluation of frequency dependent performance parameters - likegain and input impedance - as a function of the fluence. The linearity of theASIC response has been measured directly in the neutron tests with a triangularinput pulse of varying amplitude. The performance measurements and expectedperformance degradations under HL-LHC conditions are presented.

Proton and Neutron Irradiation Tests of Readout Electronics of the ATLAS Hadronic Endcap Calorimeter