In the context of an intensive upgrade plan for the Large Hadron Collider (LHC) in order to provide proton beams of increased luminosity, a revision of the data readout electronics of the Liquid-Argon-Calorimeter of the ATLAS detector is scheduled. This is required to retain the efficiency of the trigger at increased event rates despite its fixed bandwidth. The focus lies on the early digitization and finer segmentation of the data provided to the trigger. Furthermore, there is the possibility to implement new energy reconstruction algorithms which are adapted to the specific requirements of the trigger. In order to constitute crucial design decisions, such as the digitization scale or the choice of digital signal processing algorithms, comprehensive simulations are required. High trigger efficiencies are decisive at it for the successful continuation of the measurements of rare StandardModel processes as well as for a high sensitivity to new physics beyond the established theories. It can be shown that a significantly improved resolution of the missing transverse energy calculated by the trigger is achievable due to the revised segmentation of the data. Various energy reconstruction algorithms are investigated in detail. It can be concluded that these will facilitate reliable trigger decisions for all expected working conditions and for the whole possible energy range.

In the context of an intensive upgrade plan for the Large Hadron Collider (LHC) in order to provide proton beams of increased luminosity, a revision of the data readout electronics of the Liquid-Argon-Calorimeter of the ATLAS detector is scheduled. This is required to retain the efficiency of the trigger at increased event rates despite its fixed bandwidth. The focus lies on the early digitization and finer segmentation of the data provided to the trigger. Furthermore, there is the possibility to implement new energy reconstruction algorithms which are adapted to the specific requirements of the trigger. In order to constitute crucial design decisions, such as the digitization scale or the choice of digital signal processing algorithms, comprehensive simulations are required. High trigger efficiencies are decisive at it for the successful continuation of the measurements of rare StandardModel processes as well as for a high sensitivity to new physics beyond the established theories. It can be shown that a significantly improved resolution of the missing transverse energy calculated by the trigger is achievable due to the revised segmentation of the data. Various energy reconstruction algorithms are investigated in detail. It can be concluded that these will facilitate reliable trigger decisions for all expected working conditions and for the whole possible energy range.

This thesis presents an electrical model of two pairs of interconnects of the ATLAS Phase-1 Upgrade Hadronic Endcap Front End Crate prototype baseplane. Stripline transmission lines of the baseplane are modeled using Keysight Technologies' Electromagnetic Professional's (EMPro) 3D electromagnetic simulation (Finite Element Method) and the connectors are modeled using built-in models in Keysight Technologies' Advanced Design System (ADS). The model is compared in both the time and frequency domain to measured Time Domain Reflectometer (TDR) traces and S-parameters. The S-parameters of the model are found to be within 5% of the measured S-parameters for transmission and reflection, and range from 25% below to 100% above for forward and backward crosstalk. To make comparisons with measurements, the cables used to connect the prototype HEC baseplane to the measurement system had to be included in the model. Plots of the S-parameters of a model without these cables are presented for one pair of interconnects for which the crosstalk is expected to be the higher than most other interconnects of the baseplane. / Graduate / 0605 / 0798 / rdporter@uvic.ca