Performance of the upgraded PreProcessor of the ATLAS Level-1 Calorimeter Trigger Aad, G. Aguilar Saavedra, Juan Antonio Calorimeters Trigger concepts and systems (hardware and software) The PreProcessor of the ATLAS Level-1 Calorimeter Trigger prepares the analogue trigger signals sent from the ATLAS calorimeters by digitising, synchronising, and calibrating them to reconstruct transverse energy deposits, which are then used in further processing to identify event features. During the first long shutdown of the LHC from 2013 to 2014, the central components of the PreProcessor, the Multichip Modules, were replaced by upgraded versions that feature modern ADC and FPGA technology to ensure optimal performance in the high pile-up environment of LHC Run 2. This paper describes the features of the newMultichip Modules along with the improvements to the signal processing achieved. 2021-02-04T09:25:03Z 2021-02-04T09:25:03Z 2020-11-10 info:eu-repo/semantics/article Aad, G., Abbott, B., Abbott, D. C., Abed Abud, A., Abeling, K., Abhayasinghe, D. K., ... & Angerami, A. (2020). Performance of the upgraded PreProceSSOR of the ATLAS level-1 calorimeter trigger. Journal of Instrumentation, 15(11), P11016-P11016. [https://doi.org/10.1088/1748-0221/15/11/P11016] http://hdl.handle.net/10481/66281 10.1088/1748-0221/15/11/P11016 eng http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess Atribución 3.0 España IOP Publishing LTD