The following email has been sent to KRIEGER, Peter:
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Dear Peter Krieger,
The submission of your abstract has been successfully processed.
Abstract submitted: https://indico.cern.ch/event/192695/call-for- abstracts/my-abstracts.
Status of your abstract: https://indico.cern.ch/event/192695/call- for-abstracts/273/.
See below a detailed summary of your submitted abstract:
Conference: Tipp 2014 - Third International Conference on Technology and Instrumentation in Particle Physics
Submitted by: KRIEGER, Peter
Submitted on: 25 February 2014 19:17
Title: Irradiation tests and expected performance of readout electronics of the ATLAS hadronic endcap calorimeter for the HL-LHC
Abstract content At the proposed high-luminosity LHC (HL-LHC) the readout electronics of the ATLAS Hadronic Endcap Calorimeter (HEC) will have to withstand a much harsher radiation environment than is present at the LHC design luminosity. The heart of HEC read-out electronics is the pre-amplifier and summing (PAS) system, which is realized in GaAs ASIC technology. These PAS devices are installed inside the LAr cryostats, directly on the detector. They have been proven to operate reliably in LHC conditions up to an integrated luminosity of 1000 fb$^{-1}$, including safety factors. However, at the HL-LHC a total integrated luminosity of 3000 fb$^{-1}$ is expected, which corresponds to an increase of a factor of 3-5 in the expected radiation levels. On top of this, a safety factor of at least 2 needs to be accounted for to reflect our confidence in the background rate simulations.
Samples of the GaAs ASIC have therefore been exposed to neutron and proton radiation with integrated fluences in excess of 4x10$^{15}$ n/cm$^2$ and 2.6x10$^{14}$ p/cm$^2$, several times the levels expected for ten years of HL-LHC running. In-situ measurements of S-parameters allow the evaluation of frequency-dependent performance parameters, like gain and input impedance. The non-linearity of the ASIC response has been measured both at warm and at cold, i.e. at LAr temperatures. This allows an improved estimation of the expected degradation of the HEC performance. The measured gain and non-linearity of the ASIC response have been applied to Monte-Carlo simulations in order to understand their effects on jet measurements in HL-LHC conditions.
Summary
Primary Authors: KRIEGER, Peter (University of Toronto (CA)) krieger@physics.utoronto.ca
Co-authors:
Abstract presenters: KRIEGER, Peter
Track classification: Experiments: 2a) Experiments & Upgrades Data-processing: 3a) Front-end Electronics
Presentation type: Oral
Comments: I am submitting this abstract on behalf of the ATLAS Liquid Argon Calorimeter group, in my role as the Chair of our speakers committee. I have listed myself as the presenter, above, since this is necessary for the abstract submission. The actual speaker will be identified when / if the abstract is accepted. Please let me know if this poses any problems. For the track classification, I have selected two, but we would prefer this to be in the Experiments & Upgrades session. The main issue is the performance degradation studies, which are based on the results of irradiation testing of the current readout electronics.