Global Trigger Versatile Module for ATLAS Phase-II upgrade

A Phase-II upgrade of the ATLAS detector for the High Luminosity LHC will affect most of the detector’s subsystems, including the Trigger and Data Acquisition (TDAQ) subsystem. The core part of the TDAQ subsystem in Phase-II is the Global Trigger, which is capable of performing algorithms on a full-granularity calorimeter cells as well as applying topological requirements and refining the trigger objects from the upstream Feature Extractors. A Global Common Module (GCM) is the main building block of the Global Trigger. A design of an additional, standalone, Global Trigger Versatile Module (GVM) has been completed in compliance with the hardware specifications of the Global Trigger prototype. While possessing high processing and bandwidth capabilities, the GVM is intended to be used as an auxiliary hardware component for operational, testing and development purposes of the Global Trigger as well as other resource and bandwidth critical projects. A high-density PCB of the GVM is designed for high-speed data transmission and features 25.8 Gb/s capable Finisar BOA optical modules, a modern Xilinx Ultrascale+ VU13P FPGA as well as other hardware components essential for the Global Trigger. GCM development firmware tests, VU13P FPGA’s and Finisar BOA optical modules’ performance evaluation as well as the module’s main hardware functionality verification composes a full testing program for the GVM, which was passed successfully.