Abstract
The ATLAS Liquid Argon (LAr) calorimeters produce a total of 182,486 signals which are digitized and processed by the front-end and back-end electronics at every triggered event. In addition, the front-end electronics is summing analog signals to provide coarsely grained energy sums, called trigger towers, to the first-level trigger system, which is optimized for nominal LHC luminosities. However, the pile-up noise expected during the high luminosity phases of LHC will be increased by factors of 3–7. An improved spatial granularity of the trigger primitives is therefore proposed in order to improve the identification performance for trigger signatures, like electrons or photons, at high background rejection rates. The general concept of the upgraded LAr calorimeter readout together with the various electronics components to be developed for such a complex system is presented. The R&D activities and architectural studies undertaken by the ATLAS LAr Calorimeter group are described.
Highlights
Redundancy of the optical data transmission is foreseen in order to react on unforeseen link failures
A total bandwidth of 200-300 Gbps is estimated for one LAr Trigger Digitizer Board (LTDB) sending off up to 288 signals at 40 MHz
On Level-1 accept, data are transmitted to the DAQ and/or the high-level trigger system
Summary
An upgrade of the LHC to the HL-LHC [1] foresees an increase of the instantaneous luminosities from 1034cm−2s−1 up to 5 − 7 × 1034cm−2s−1 in two phases (I and II) in the years beyond 2020. The calorimeter trigger selects physics signatures, like high-pT electrons or photons
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